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<SEC-DOCUMENT>0001104659-05-044985.txt : 20050920
<SEC-HEADER>0001104659-05-044985.hdr.sgml : 20050920
<ACCEPTANCE-DATETIME>20050920172315
ACCESSION NUMBER:		0001104659-05-044985
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		9
CONFORMED PERIOD OF REPORT:	20050902
ITEM INFORMATION:		Entry into a Material Definitive Agreement
ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20050920
DATE AS OF CHANGE:		20050920

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TGC INDUSTRIES INC
		CENTRAL INDEX KEY:			0000799165
		STANDARD INDUSTRIAL CLASSIFICATION:	OIL AND GAS FIELD EXPLORATION SERVICES [1382]
		IRS NUMBER:				742095844
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32472
		FILM NUMBER:		051094222

	BUSINESS ADDRESS:	
		STREET 1:		1304 SUMMIT AVE STE 2
		CITY:			PLANO
		STATE:			TX
		ZIP:			75074
		BUSINESS PHONE:		9728811099

	MAIL ADDRESS:	
		STREET 1:		1304 SUMMIT AVE
		STREET 2:		STE 2
		CITY:			PLANO
		STATE:			TX
		ZIP:			75074
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>a05-16471_18k.htm
<DESCRIPTION>8-K
<TEXT>
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<body lang="EN-US">

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<div style="border:none;border-top:double windowtext 9.0pt;padding:0in 0in 0in 0in;">

<p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

</div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES<br>
</font></b><b><font size="5" style="font-size:18.0pt;font-weight:bold;">SECURITIES AND EXCHANGE COMMISSION</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington, D.C.&#160; 20549</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM
8-K</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT
REPORT</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Pursuant
to Section 13 or 15(d) of the<br>
Securities Exchange Act of 1934</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">DATE OF REPORT (DATE OF
EARLIEST EVENT REPORTED):</font></p>

<p align="center" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">September
20, 2005</font></b>  <b><font style="font-weight:bold;">&#160;(September 2, 2005)</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">TGC
INDUSTRIES, INC.</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of registrant
as specified in its charter)</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Texas</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">001-32472</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">74-2095844</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State of
  incorporation)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission File
  Number)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(IRS Employer
  Identification No.)</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">1304 Summit Ave., Ste 2</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Plano, TX&#160; 75074</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of principal
executive offices) (Zip Code)</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registrant&#146;s telephone
number, including area code:&#160; <b><font style="font-weight:bold;">(972) 881-1099</font></b></font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (<i><font style="font-style:italic;">see </font></i>General
Instruction A.2. below):</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
240.14d-2(b))</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
240.13e-4(c))</p>

<div style="border:none;border-bottom:double windowtext 9.0pt;padding:0in 0in 0in 0in;">

<p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

</div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Section 1 &#150; Registrant&#146;s
Business and Operations</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 1.01&#160; Entry into a Material Definitive Agreement.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">Amendment to Promissory Note</font></i></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On
September 16, 2005, TGC Industries, Inc. (&#147;TGC&#148; or the &#147;Company&#148;) entered into
an amendment (the &#147;Amendment&#148;) to its promissory note with Sovereign Bank,
N.A., dated April 26, 2005.&#160; The
Amendment allows TGC to borrow, repay and re-borrow from time to time until
September 16, 2005, up to $3,500,000.&#160;
TGC&#146;s obligations under the Amendment are secured by a security interest
in the Company&#146;s accounts receivable.&#160;
Interest on the outstanding amount under the Amendment is payable
monthly at a rate of prime plus 1.0%.&#160;
The Company also amended the related business loan agreement to reflect
the increase in the amount available under the Amendment and the new maturity
date.&#160; The business loan agreement
provides for non-financial and financial covenants, including a minimum debt to
worth ratio of 1 to 1.50 and a minimum liquidity of $500,000.&#160; A copy of the Amendment and the related
business loan agreement are being filed as Exhibits 10.1 and 10.2 to this
Current Report on Form 8-K.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">Promissory Notes</font></i></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">&nbsp;</font></i></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On
September 2, 2005, TGC entered into a promissory note (the &#147;September 2<sup>nd</sup>
Note&#148;) with General Electric Capital Corporation (&#147;GECC&#148;) to finance the
purchase of a vibration vehicle.&#160; The
September 2<sup>nd</sup> Note is for the principal sum of $286,235, which will
be repaid in thirty-six monthly principal payments of $8,870.86 with the final
payment equal to the total outstanding unpaid principal.&#160; In addition to the principal payments,
accrued interest will also be payable on all payment dates. Interest on the
unpaid principal balance will accrue at a rate of 7.25% per annum.&#160; The September 2<sup>nd</sup> Note also
provides for a pre-payment penalty equal to 3% of the original principal amount
in the first year and 1% of the original principal amount in the second and
third years of the September 2<sup>nd</sup> Note.&#160; The first monthly payment is due and payable
on October 2, 2005.&#160; On September 9,
2005, the September 2<sup>nd</sup> Note was amended to change the amount of the
first thirty-five monthly principal payments from $8,870.86 to $7,950.97.&#160; A copy of the September 2<sup>nd</sup> Note
and the related amendment are being filed as Exhibit 10.3 and 10.4 to this
Current Report on Form 8-K.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On
September 12, 2005, TGC entered into a promissory note (the &#147;September 12<sup>th</sup>
Note&#148;) with GECC to finance the purchase of a second vibration vehicle.&#160; The September 12<sup>th</sup> Note is for the
principal sum of $286,235, which will be repaid in thirty-six monthly principal
payments of $8,906.59 with the final payment equal to the total outstanding
unpaid principal.&#160; In addition to the
principal payments, accrued interest will also be payable on all payment dates.
Interest on the unpaid principal balance will accrue at a rate of 7.25% per
annum.&#160; The September 12<sup>th</sup>
Note also provides for a pre-payment penalty equal to 3% of the original
principal amount in the first year and 1% of the original principal amount in
the second and third years of the September 12<sup>th </sup>&#160;Note.&#160;
The first monthly payment is due and payable on November 2, 2005.&#160; On September 9, 2005, and becoming effective
on September 12, 2005, the September 12<sup>th</sup> Note was amended to change
the amount of the first thirty-five monthly principal payments from $8,906.59
to $7,950.97.&#160; The September 12<sup>th</sup>
Note was also amended on September 12, 2005, to change the date of the initial
periodic payment from November 2, 2005 to October 12, 2005.&#160; A copy of the September 12<sup>th</sup> Note
and the related amendments are being filed as Exhibit 10.5, 10.6 and 10.7 to
this Current Report on Form 8-K.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2.03&#160; Creation of a Direct Financial Obligation or
an Obligation under an Off-Balance Sheet Arrangement of the Registrant.</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">See
Item 1.01 &#147;Entry into a Material Definitive Agreement &#150; Amendment to Promissory
Note&#148; and &#147;Entry into a Material Definitive Agreement &#150; Promissory Notes.&#148;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Section 9 &#150; Financial
Statements and Exhibits</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 9.01&#160; Financial Statements and Exhibits.</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(c)</font></b><b><font size="1" face="Times New Roman" style="font-size:9.0pt;font-weight:bold;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font></b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Exhibits.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.1</font><font size="1" face="Times New Roman" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" face="Times New Roman" style="font-size:10.0pt;">Promissory Note by and among TGC Industries,
Inc. and Sovereign Bank, N.A., dated September 16, 2005.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.2</font><font size="1" face="Times New Roman" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" face="Times New Roman" style="font-size:10.0pt;">Business Loan Agreement by and among TGC
Industries, Inc. and Sovereign Bank, N.A., dated September 16, 2005.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.3</font><font size="1" face="Times New Roman" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" face="Times New Roman" style="font-size:10.0pt;">Promissory Note by and among TGC Industries,
Inc. and General Electric Capital Corporation, dated September 2, 2005.</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.4</font><font size="1" face="Times New Roman" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment, dated September 9, 2005, to the
Promissory Note by and among TGC Industries, Inc. and General Electric Capital
Corporation, dated September 2, 2005.</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.5</font><font size="1" face="Times New Roman" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" face="Times New Roman" style="font-size:10.0pt;">Promissory Note by and among TGC Industries,
Inc. and General Electric Capital Corporation, dated September 12, 2005.</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.6</font><font size="1" face="Times New Roman" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment, dated September 9, 2005 and effective
September 12, 2005, to the Promissory Note by and among TGC Industries, Inc.
and General Electric Capital Corporation, dated September 12, 2005.</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;text-autospace:none;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.7</font><font size="1" face="Times New Roman" style="font-size:8.5pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment, dated September 12, 2005, to the
Promissory Note by and among TGC Industries, Inc. and General Electric Capital
Corporation, dated September 12, 2005.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURES</font></b></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the
requirements of the Securities Exchange Act of 1934, the registrant has duly
caused this report to be signed on its behalf by the undersigned hereunto duly
authorized.</font></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="50%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC INDUSTRIES</font></b><b><font size="2" style="font-size:10.0pt;font-weight:bold;">, INC.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date:&nbsp;
  September 20, 2005</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.7%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="18%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:18.52%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Wayne A. Whitener</font></p>
  </td>
  <td width="27%" valign="top" style="padding:0in 0in 0in 0in;width:27.78%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.7%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="46%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wayne A. Whitener</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.7%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="46%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">President and CEO</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.7%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="46%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.7%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="46%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Signing on behalf of the Registrant and as
  Principal<br>
  Executive Officer)</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT INDEX</font></b></p>

<p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="8%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit No.</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="89%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:89.4%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:8.34%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:89.4%;">
  <p align="left" style="margin:0in 0in .0001pt;text-align:left;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.1</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Promissory Note by and among TGC Industries,
  Inc. and Sovereign Bank, N.A., dated September 16, 2005.</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.2</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Business Loan Agreement by and among TGC
  Industries, Inc. and Sovereign Bank, N.A., dated September 16, 2005.</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.3</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Promissory Note by and among TGC Industries,
  Inc. and General Electric Capital Corporation, dated September 2, 2005.</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.4</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment, dated September 9, 2005, to the
  Promissory Note by and among TGC Industries, Inc. and General Electric
  Capital Corporation, dated September 2, 2005.</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.5</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Promissory Note by and among TGC Industries,
  Inc. and General Electric Capital Corporation, dated September 12, 2005.</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.6</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment, dated September 9, 2005 and
  effective September 12, 2005, to the Promissory Note by and among TGC
  Industries, Inc. and General Electric Capital Corporation, dated September
  12, 2005.</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="8%" valign="top" style="padding:0in 0in 0in 0in;width:8.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.7</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="89%" valign="top" style="padding:0in 0in 0in 0in;width:89.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment, dated September 12, 2005, to the
  Promissory Note by and among TGC Industries, Inc. and General Electric
  Capital Corporation, dated September 12, 2005.</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<TYPE>EX-10.1
<SEQUENCE>2
<FILENAME>a05-16471_1ex10d1.htm
<DESCRIPTION>EX-10.1
<TEXT>
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<head>





</head>

<body lang="EN-US">

<div style="font-family:Times New Roman;">

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit 10.1</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CORPORATE RESOLUTION TO BORROW / GRANT
COLLATERAL</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="12%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:12.78%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Principal</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Loan Date</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Maturity</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Loan No</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Call / Coll</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Account</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Officer</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Initials</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">$</font></b></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.54%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">3,500,000.00</font></b></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">09-16-2005</font></b></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">09-16-2006</font></b></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">17003864</font></b></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">4A / 466</font></b></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SBV</font></b></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr height="0">
  <td width="17" style="border:none;"></td>
  <td width="79" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="75" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="75" style="border:none;"></td>
  <td width="7" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">References in the shaded area are for Lender&#146;s use only and do not
limit the applicability<br>
of this document to any particular loan or item.<br>
Any item above containing &#147;* * *&#148; has been omitted due to text length
limitations.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="81" valign="top" style="padding:0in 0in 0in 0in;width:60.75pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;"><br>
  </font>Corporation:</font></b></p>
  </td>
  <td width="183" valign="top" style="padding:0in 0in 0in 0in;width:137.25pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman"><font style="font-size:10.0pt;font-weight:bold;"><br>
  </font>TGC Industries, Inc.<br>
  1304 Summit Avenue, Ste. 2<br>
  Plano, TX 75074</font></b></p>
  </td>
  <td width="16" valign="top" style="padding:0in 0in 0in 0in;width:12.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="120" valign="top" style="padding:0in 0in 0in 0in;width:1.25in;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="100" valign="top" style="padding:0in 0in 0in 0in;width:75.0pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Lender:</font></b></p>
  </td>
  <td width="140" valign="top" style="padding:0in 0in 0in 0in;width:105.0pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Sovereign Bank, N.A.<br>
  Preston Center<br>
  6060 Sherry Lane<br>
  Dallas, TX 75225</font></b></p>
  </td>
  <td width="20" valign="top" style="padding:0in 0in 0in 0in;width:15.0pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="60" valign="top" style="padding:0in 0in 0in 0in;width:45.0pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">I, THE UNDERSIGNED, DO HEREBY CERTIFY THAT:</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">THE CORPORATION&#146;S EXISTENCE.</font></b> &#160;The
complete and correct name of the Corporation is TGC Industries,&nbsp;Inc. (&#147;Corporation&#148;).
The Corporation is a corporation for profit which is, and at all times shall
be, duly organized, validly existing, and in good standing under and by virtue
of the laws of the State of Texas. The Corporation is duly authorized to
transact business in all other states in which the Corporation is doing
business, having obtained all necessary filings, governmental licenses and
approvals for each state in which the Corporation is doing business.
Specifically, the Corporation is, and at all times shall be, duly qualified as
a foreign corporation in all states in which the failure to so qualify would
have a material adverse effect on its business or financial condition. The
Corporation has the full power and authority to own its properties and to
transact the business in which it is presently engaged or presently proposes to
engage. The Corporation maintains an office at 1304 Summit Avenue, Ste. 2, Plano,
TX 75074. Unless the Corporation has designated otherwise in writing, the
principal office is the office at which the Corporation keeps its books and
records. The Corporation will notify Lender prior to any change in the location
of The Corporation&#146;s state of organization or any change in The Corporation&#146;s
name. The Corporation shall do all things necessary to preserve and to keep in
full force and effect its existence, rights and privileges, and shall comply
with all regulations, rules, ordinances, statutes, orders and decrees of any
governmental or quasi-governmental authority or court applicable to the Corporation
and The Corporation&#146;s business activities.</p>

<p style="margin:0in 0in .0001pt 1.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">RESOLUTIONS ADOPTED.</font></b> &#160;At a
meeting of the Directors of the Corporation, or if the Corporation is a close
corporation having no Board of Directors then at a meeting of the Corporation&#146;s
shareholders, duly called and held on&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,
at which a quorum was present and voting, or by other duly authorized action in
lieu of a meeting, the resolutions set forth in this Resolution were adopted.</p>

<p style="margin:0in 0in .0001pt 1.0pt;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">OFFICER.</font></b> &#160;The
following named person is an officer of TGC Industries,&nbsp;Inc.:</p>

<p style="margin:0in 0in .0001pt 1.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.7%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="20%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:20.36%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">NAMES</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.74%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="14%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:14.44%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">TITLES</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.9%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="15%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:15.38%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">AUTHORIZED</font></b></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.48%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="26%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:26.58%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">ACTUAL SIGNATURES</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="padding:0in 0in 0in 0in;width:10.42%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.7%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="20%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:20.36%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.74%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:14.44%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.9%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="15%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:15.38%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.48%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="26%" colspan="2" valign="top" style="border:none;padding:0in 0in 0in 0in;width:26.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.42%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.7%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="20%" valign="top" style="padding:0in 0in 0in 0in;width:20.36%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Wayne Whitener</font></b></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.74%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="14%" valign="top" style="padding:0in 0in 0in 0in;width:14.44%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">President&nbsp;&amp; CEO</font></b></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.9%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="15%" valign="top" style="padding:0in 0in 0in 0in;width:15.38%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Y</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.48%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:2.82%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="23%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:23.76%;">
  <p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;/s/ </font>Wayne Whitener</p>
  </td>
  <td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.42%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="28" style="border:none;"></td>
  <td width="152" style="border:none;"></td>
  <td width="20" style="border:none;"></td>
  <td width="108" style="border:none;"></td>
  <td width="22" style="border:none;"></td>
  <td width="115" style="border:none;"></td>
  <td width="26" style="border:none;"></td>
  <td width="21" style="border:none;"></td>
  <td width="178" style="border:none;"></td>
  <td width="78" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt 19.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ACTIONS AUTHORIZED.</font></b> &#160;The
authorized person listed above may enter into any agreements of any nature with
Lender, and those agreements will bind the Corporation. Specifically, but
without limitation, the authorized person is authorized, empowered, and
directed to do the following for and on behalf of the Corporation:</p>

<p style="margin:0in 0in .0001pt 1.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Borrow Money.</font></b> &#160;To
borrow, as a cosigner or otherwise, from time to time from Lender, on such
terms as may be agreed upon between the Corporation and Lender, such sum or
sums of money as in his or her judgment should be borrowed, without limitation.</p>

<p style="margin:0in 0in .0001pt 19.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Execute Notes.</font></b> &#160;To
execute and deliver to Lender the promissory note or notes, or other evidence
of the Corporation&#146;s credit accommodations, on Lender&#146;s forms, at such rates of
interest and on such terms as may be agreed upon, evidencing the sums of money
so borrowed or any of the Corporation&#146;s indebtedness to Lender, and also to
execute and deliver to Lender one or more renewals, extensions, modifications,
refinancings, consolidations, or substitutions for one or more of the notes,
any portion of the notes, or any other evidence of credit accommodations.</p>

<p style="margin:0in 0in .0001pt 19.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Grant Security.</font></b> &#160;To
mortgage, pledge, transfer, endorse, hypothecate, or otherwise encumber and
deliver to Lender any property now or hereafter belonging to the Corporation or
in which the Corporation now or hereafter may have an interest, including
without limitation all of the Corporation&#146;s real property and all of the
Corporation&#146;s personal property (tangible or intangible), as security for the
payment of any loans or credit accommodations so obtained, any promissory notes
so executed (including any amendments to or modifications, renewals, and
extensions of such promissory notes), or any other or further indebtedness of
the Corporation to Lender at any time owing, however the same may be evidenced.
Such property may be mortgaged, pledged, transferred, endorsed, hypothecated or
encumbered at the time such loans are obtained or such indebtedness is
incurred, or at any other time or times, and may be either in addition to or in
lieu of any property theretofore mortgaged, pledged, transferred, endorsed,
hypothecated or encumbered.</p>

<p style="margin:0in 0in .0001pt 19.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Execute Security Documents.</font></b> &#160;To
execute and deliver to Lender the forms of mortgage, deed of trust, pledge
agreement, hypothecation agreement, and other security agreements and financing
statements which Lender may require and which shall evidence the terms and
conditions under and pursuant to which such liens and encumbrances, or any of
them, are given; and also to execute and deliver to Lender any other written
instruments, any chattel paper, or any other collateral, of any kind or nature,
which Lender may deem necessary or proper in connection with or pertaining to
the giving of the liens and encumbrances.</p>

<p style="margin:0in 0in .0001pt 19.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Negotiate Items.</font></b> &#160;To
draw, endorse, and discount with Lender all drafts, trade acceptances,
promissory notes, or other evidences of indebtedness payable to or belonging to
the Corporation or in which the Corporation may have an interest, and either to
receive cash for the same or to cause such proceeds to be credited to the
Corporation&#146;s account with Lender, or to cause such other disposition of the
proceeds derived therefrom as he or she may deem advisable.</p>

<p style="margin:0in 0in .0001pt .25in;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Further Acts.</font></b> &#160;In the
case of lines of credit, to designate additional or alternate individuals as
being authorized to request advances under such lines, and in all cases, to do
and perform such other acts and things, to pay any and all fees and costs, and
to execute and deliver such other documents and agreements as the officer may
in his or her discretion deem reasonably necessary or proper in order to carry
into effect the provisions of this Resolution.</p>

<p style="margin:0in 0in .0001pt .25in;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ASSUMED BUSINESS NAMES.</font></b> &#160;The
Corporation has filed or recorded all documents or filings required by law
relating to all assumed business names used by the Corporation. Excluding the
name of the Corporation, the following is a complete list of all assumed
business names under which the Corporation does business: <b><font style="font-weight:bold;">None</font></b>.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">NOTICES TO LENDER.</font></b> &#160;The
Corporation will promptly notify Lender in writing at Lender&#146;s address shown
above (or such other addresses as Lender may designate from time to time) prior
to any (A)&nbsp;change in the Corporation&#146;s name; (B)&nbsp;change in the
Corporation&#146;s assumed business name(s); (C)&nbsp;change in the management of
the Corporation; (D)&nbsp;change in the authorized signer(s); (E)&nbsp;change
in the Corporation&#146;s principal office address; (F) change in the Corporation&#146;s
state of organization; (G)&nbsp;conversion of the Corporation to a new or
different type of business entity; or (H)&nbsp;change in any other aspect of
the Corporation that directly or indirectly relates to any agreements between
the Corporation and Lender. No change in the Corporation&#146;s name or state of
organization will take effect until after Lender has received notice.</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CERTIFICATION CONCERNING OFFICERS
AND RESOLUTIONS.</font></b> &#160;The officer named above is duly elected, appointed,
or employed by or for the Corporation, as the case may be, and occupies the
position set opposite his or her respective name. This Resolution now stands of
record on the books of the Corporation, is in full force and effect, and has
not been modified or revoked in any manner whatsoever.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.0pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">NO CORPORATE SEAL.</font></b> &#160;The
Corporation has no corporate seal, and therefore, no seal is affixed to this
Resolution.</p>

<p style="margin:0in 0in .0001pt 1.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CONTINUING VALIDITY.</font></b> &#160;Any
and all acts authorized pursuant to this Resolution and performed prior to the
passage of this Resolution are hereby ratified and approved. This Resolution
shall be continuing, shall remain in full force and effect and Lender may rely
on it until written notice of its revocation shall have been delivered to
Lender and receipt acknowledged by Lender in writing at Lender&#146;s address shown
above (or such addresses as Lender may designate from time to time). Any such
notice shall not affect any of the Corporation&#146;s agreements or commitments in
effect at the time notice is given.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">IN TESTIMONY WHEREOF, I have
hereunto set my hand and attest that the signature set opposite the name listed
above is his or her genuine signature.</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><b><font size="2" face="Times New Roman">&nbsp;</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">I have read all the provisions of
this Resolution, and I personally and on behalf of the Corporation certify that
all statements and representations made in this Resolution are true and correct. This Corporate
Resolution to Borrow / Grant Collateral is dated&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="51%" valign="top" style="padding:0in 0in 0in 0in;width:51.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:48.12%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CERTIFIED TO AND ATTESTED BY:</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="51%" valign="top" style="padding:0in 0in 0in 0in;width:51.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:48.12%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="51%" valign="top" style="padding:0in 0in 0in 0in;width:51.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:48.12%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="51%" valign="top" style="padding:0in 0in 0in 0in;width:51.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.3%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="43%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:43.98%;">
  <p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;/s/ </font>Wayne Whitener</p>
  </td>
  <td width="1%" valign="top" style="padding:0in 0in 0in 0in;width:1.86%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="51%" valign="top" style="padding:0in 0in 0in 0in;width:51.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.3%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="45%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:45.82%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Wayne Whitener,
  President&nbsp;&amp; CEO of TGC Industries,<br>
  Inc.</font></b></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">NOTE: If the
officer signing this Resolution is designated by the foregoing document as one
of the officers authorized to act on the Corporation&#146;s behalf, it is advisable
to have this Resolution signed by at least one non-authorized officer of the
Corporation.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>

<div style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PROMISSORY NOTE</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="12%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:12.78%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Principal</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Loan Date</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Maturity</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Loan No</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Call / Coll</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Account</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Officer</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Initials</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.54%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3,500,000.00</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">09-16-2005</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">09-16-2006</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">17003864</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4A / 466</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SBV</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="17" style="border:none;"></td>
  <td width="79" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="75" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="75" style="border:none;"></td>
  <td width="7" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">References
in the shaded area are for Lender&#146;s use only and do not limit the applicability<br>
of this document to any particular loan or item.</font></p>

<p align="center" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman"><font style="font-size:10.0pt;">Any
item above containing</font> &#147;* * *&#148;</font> has been omitted due to text length limitations.</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="81" valign="top" style="padding:0in 0in 0in 0in;width:60.75pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Borrower:</font></b></p>
  </td>
  <td width="186" valign="top" style="padding:0in 0in 0in 0in;width:139.25pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC Industries, Inc.<br>
  1304 Summit Avenue, Ste. 2<br>
  Plano, TX 75074</font></b></p>
  </td>
  <td width="20" valign="top" style="padding:0in 0in 0in 0in;width:15.0pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="73" valign="top" style="padding:0in 0in 0in 0in;width:55.0pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="90" valign="top" style="padding:0in 0in 0in 0in;width:67.5pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Lender:</font></b></p>
  </td>
  <td width="145" valign="top" style="padding:0in 0in 0in 0in;width:108.95pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Sovereign
  Bank, N.A.<br>
  Preston Center<br>
  6060 Sherry Lane<br>
  Dallas, TX 75225</font></b></p>
  </td>
  <td width="35" valign="top" style="padding:0in 0in 0in 0in;width:26.05pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="90" valign="top" style="padding:0in 0in 0in 0in;width:67.5pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="32%" valign="bottom" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Principal Amount: $3,500,000.00</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="32%" valign="bottom" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Initial Rate: 7.500%</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="32%" valign="bottom" style="padding:0in 0in 0in 0in;width:32.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Date of Note: September&nbsp;16,
  2005</font></b></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt 4.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PROMISE TO PAY.</font></b> &#160;TGC
Industries,&nbsp;Inc. (&#147;Borrower&#148;) promises to pay to Sovereign Bank, N.A. (&#147;Lender&#148;),
or order, in lawful money of the United States of America, the principal amount
of Three Million Five Hundred Thousand&nbsp;&amp; 00/100 Dollars ($3,500,000.00)
or so much as may be outstanding, together with interest on the unpaid
outstanding principal balance of each advance. Interest shall be calculated
from the date of each advance until repayment of each advance or maturity,
whichever occurs first.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CHOICE OF USURY CEILING AND
INTEREST RATE.</font></b> &#160;The interest rate on this Note has been
implemented under the &#147;Quarterly Ceiling&#148; as referred to in Section&nbsp;303.006
of the Texas Finance Code. The terms, including the rate, or index, formula, or
provision of law used to compute the rate on the Note, will be subject to
revision as to current and future balances, from time to time by notice from
Lender in compliance with Section&nbsp;303.103 of the Texas Finance Code.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PAYMENT.</font></b> &#160;Borrower will pay this loan in one payment of
all outstanding principal plus all accrued unpaid interest on September&nbsp;16,
2006. In addition, Borrower will pay regular monthly payments of all accrued
unpaid interest due as of each payment date, beginning October&nbsp;16, 2005,
with all subsequent interest payments to be due on the same day of each month
after that. Unless otherwise agreed or required by applicable law, payments
will be applied first to any accrued unpaid interest; and then to principal.
The annual interest rate for this Note is computed on a 365/360 basis; that is,
by applying the ratio of the annual interest rate over a year of 360 days,
multiplied by the outstanding principal balance, multiplied by the actual
number of days the principal balance is outstanding, unless such calculation
would result in a usurious rate, in which case interest shall be calculated on
a per diem basis of a year of 365 or 366 days, as the case may be. Borrower
will pay Lender at Lender&#146;s address shown above or at such other place as
Lender may designate in writing. Notwithstanding any other provision of this
Note, Lender will not charge interest on any undisbursed loan proceeds. No
scheduled payment, whether of principal or interest or both, will be due unless
sufficient loan funds have been disbursed by the scheduled payment date to
justify the payment.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">VARIABLE INTEREST RATE.</font></b> &#160;The
interest rate on this Note is subject to change from time to time based on
changes in an independent index which is the Sovereign Bank, N.A. Prime Rate as
determined, currently equal to Wall Street Journal Prime Rate as quoted in the
Southwestern Addition of the Wall Street Journal (the &#147;Index&#148;). The index is
not necessarily the lowest rate charged by Lender on its loans. If the index
becomes unavailable during the term of this loan, Lender may designate a
substitute index after notice to Borrower. Lender will tell Borrower the
current index rate upon Borrower&#146;s request. The interest rate change will not
occur more often than each Day. Borrower understands that Lender may make loans
based on other rates as well. The index currently is 6.500% per annum. The
interest rate to be applied prior to maturity to the unpaid principal balance
of this Note will be at a rate of 1.000 percentage point over the index,
resulting in an initial rate of 7.500% per annum. NOTICE: Under no
circumstances will the interest rate on this Note be more than the maximum rate
allowed by applicable law. For purposes of this Note, the &#147;maximum rate allowed
by applicable law&#148; means the greater of (A)&nbsp;the maximum rate of interest
permitted under federal or other law applicable to the indebtedness evidenced
by this Note, or (B) the &#147;Quarterly Ceiling&#148; as referred to in Section&nbsp;303.006
of the Texas Finance Code.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PREPAYMENT. </font></b>&#160;Borrower may pay without penalty all or a
portion of the amount owed earlier than it is due. Prepayment in full shall
consist of payment of the remaining unpaid principal balance together with all
accrued and unpaid interest and all other amounts, costs and expenses for which
Borrower is responsible under this Note or any other agreement with Lender
pertaining to this loan, and in no event will Borrower ever be required to pay
any unearned interest. Early payments will not, unless agreed to by Lender in
writing, relieve Borrower of Borrower&#146;s obligation to continue to make payments
of accrued unpaid interest. Rather, early payments will reduce the principal
balance due. Borrower agrees not to send Lender payments marked &#147;paid in full&#148;,
&#147;without recourse&#148;, or similar language. If Borrower sends such a payment,
Lender may accept it without losing any of Lender&#146;s rights under this Note, and
Borrower will remain obligated to pay any further amount owed to Lender. All
written communications concerning disputed amounts, including any check or
other payment instrument that indicates that the payment constitutes &#147;payment
in full&#148; of the amount owed or that is tendered with other conditions or
limitations or as full satisfaction of a disputed amount must be mailed or
delivered to: Sovereign Bank, N.A., 7301 North State Highway 161 Irving, TX
75039.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">POST MATURITY RATE.</font></b> &#160;The
Post Maturity Rate on this Note is the lesser of the maximum rate allowed by
law or the variable interest rate in effect at the time of final maturity.
Borrower will pay interest on all sums due after final maturity, whether by
acceleration or otherwise, at that rate.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">DEFAULT.</font></b> &#160;Each
of the following shall constitute an event of default (&#147;Event of Default&#148;)
under this Note:</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Payment Default.</font></b> &#160;Borrower
fails to make any payment when due under this Note.</p>

<p style="margin:0in 0in .0001pt .25in;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Other Defaults.</font></b> &#160;Borrower fails to comply with or to perform
any other term, obligation, covenant or condition contained in this Note or in
any of the related documents or to comply with or to perform any term,
obligation, covenant or condition contained in any other agreement between
Lender and Borrower.</p>

<p style="margin:0in 0in .0001pt .25in;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Default in Favor of Third
Parties.</font></b> &#160;Borrower or any Grantor defaults under any
loan, extension of credit, security agreement, purchase or sales agreement, or
any other agreement, in favor of any other creditor or person that may
materially affect any of Borrower&#146;s property or Borrower&#146;s ability to repay
this Note or perform Borrower&#146;s obligations under this Note or any of the
related documents.</p>

<p style="margin:0in 0in .0001pt 17.0pt;text-autospace:none;text-indent:1.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">False Statements.</font></b> &#160;Any
warranty, representation or statement made or furnished to Lender by Borrower
or on Borrower&#146;s behalf under this Note or the related documents is false or
misleading in any material respect, either now or at the time made or furnished
or becomes false or misleading at any time thereafter.</p>

<p style="margin:0in 0in .0001pt 17.0pt;text-autospace:none;text-indent:-7.95pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Insolvency.</font></b> &#160;The dissolution
or termination of Borrower&#146;s existence as a going business, the insolvency of
Borrower, the appointment of a receiver for any part of Borrower&#146;s property,
any assignment for the benefit of creditors, any type of creditor workout, or
the commencement of any proceeding under any bankruptcy or insolvency laws by
or against Borrower.</p>

<p style="margin:0in 0in .0001pt 17.0pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Creditor or Forfeiture
Proceedings.</font></b> &#160;Commencement of foreclosure or forfeiture
proceedings, whether by judicial proceeding, self-help, repossession or any
other method, by any creditor of Borrower or by any governmental agency against
any collateral securing the loan. This includes a garnishment of any of
Borrower&#146;s accounts, including deposit accounts, with Lender. However, this
Event of Default shall not apply if there is a good faith dispute by Borrower
as to the validity or reasonableness of the claim which is the basis of the
creditor or</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25in;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">forfeiture
proceeding and if Borrower gives Lender written notice of the creditor or
forfeiture proceeding and deposits with Lender monies or a surety bond for the
creditor or forfeiture proceeding, in an amount determined by Lender, in its
sole discretion, as being an adequate reserve or bond for the dispute.</font></p>

<p style="background:white;margin:0in 0in .0001pt 19.45pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Events
Affecting Guarantor.</font></b> &#160;Any of the preceding events occurs with respect
to any guarantor, endorser, surety, or accommodation party of any of the
indebtedness or any guarantor, endorser, surety, or accommodation party dies or
becomes incompetent, or revokes or disputes the validity of, or liability
under, any guaranty of the indebtedness evidenced by this Note.</p>

<p style="background:white;margin:0in 0in .0001pt 19.45pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Change
In Ownership.</font></b> &#160;Any change in ownership of twenty-five percent
(25%) or more of the common stock of Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt 19.45pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Adverse
Change.</font></b> &#160;A material adverse change occurs in Borrower&#146;s
financial condition, or Lender believes the prospect of payment or performance
of this Note is impaired.</p>

<p style="background:white;margin:0in 0in .0001pt 19.45pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Insecurity.</font></b> &#160;Lender
in good faith believes itself insecure.</p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt 1.2pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">LENDER&#146;S RIGHTS.</font></b> &#160;Upon
default, Lender may declare the entire indebtedness, including the unpaid
principal balance on this Note, all accrued unpaid interest, and all other
amounts, costs and expenses for which Borrower is responsible under this Note
or any other agreement with Lender pertaining to this loan, immediately due,
without notice, and then Borrower will pay that amount.</p>

<p style="background:white;margin:0in 0in .0001pt 1.2pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .95pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ATTORNEYS&#146; FEES; EXPENSES.</font></b> &#160;Lender
may hire an attorney to help collect this Note if Borrower does not pay, and
Borrower will pay Lender&#146;s reasonable attorneys&#146; fees. Borrower also will pay
Lender all other amounts Lender actually incurs as court costs, lawful fees for
filing, recording, releasing to any public office any instrument securing this
Note; the reasonable cost actually expended for repossessing, storing,
preparing for sale, and selling any security; and fees for noting a lien on or
transferring a certificate of title to any motor vehicle offered as security
for this Note, or premiums or identifiable charges received in connection with
the sale of authorized insurance.</p>

<p style="background:white;margin:0in 0in .0001pt .95pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .95pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">GOVERNING LAW.&#160; This Note will be governed by federal law
applicable to Lender and, to the extent not preempted by federal law, the laws
of the State of Texas without regard to its conflicts of law provisions. This
Note has been accepted by Lender in the State of Texas.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .95pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .95pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CHOICE OF VENUE.</font></b> &#160;If
there is a lawsuit, and if the transaction evidenced by this Note occurred in
Dallas County, Borrower agrees upon Lender&#146;s request to submit to the
jurisdiction of the courts of Dallas County, State of Texas.</p>

<p style="background:white;margin:0in 0in .0001pt .95pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .95pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">DISHONORED CHECK CHARGE.</font></b> &#160;Borrower will pay a processing fee of $30.00
if any check given by Borrower to Lender as a payment on this loan is
dishonored.</p>

<p style="background:white;margin:0in 0in .0001pt .95pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .95pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">RIGHT OF SETOFF.</font></b> &#160;To the
extent permitted by applicable law, Lender reserves a right of setoff in all
Borrower&#146;s accounts with Lender (whether checking, savings, or some other account).
This includes all accounts Borrower holds jointly with someone else and all
accounts Borrower may open in the future. However, this does not include any
IRA or Keogh accounts, or any trust accounts for which setoff would be
prohibited by law. Borrower authorizes Lender, to the extent permitted by
applicable law, to charge or setoff all sums owing on the indebtedness against
any and all such accounts.</p>

<p style="background:white;margin:0in 0in .0001pt .95pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .95pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">COLLATERAL.</font></b> &#160;Borrower acknowledges this Note is secured by
Assignment of Accounts Receivables and General Intangibles.</p>

<p style="background:white;margin:0in 0in .0001pt .95pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .5pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">LINE OF CREDIT.</font></b> &#160;This Note evidences a revolving line of
credit. Advances under this Note, as well as directions for payment from
Borrower&#146;s accounts, may be requested orally or in writing by Borrower or by an
authorized person. Lender may, but need not, require that all oral requests be
confirmed in writing. Borrower agrees to be liable for all sums either: (A)&nbsp;advanced
in accordance with the instructions of an authorized person or (B)&nbsp;credited
to any of Borrower&#146;s accounts with Lender. The unpaid principal balance owing
on this Note at any time may be evidenced by endorsements on this Note or by
Lender&#146;s internal records, including daily computer print-outs. Lender will
have no obligation to advance funds under this Note if: (A)&nbsp;Borrower or
any guarantor is in default under the terms of this Note or any agreement that
Borrower or any guarantor has with Lender, including any agreement made in
connection with the signing of this Note; (B)&nbsp;Borrower or any guarantor ceases
doing business or is insolvent; (C)&nbsp;any guarantor seeks, claims or
otherwise attempts to limit, modify or revoke such guarantor&#146;s guarantee of
this Note or any other loan with Lender; (D)&nbsp;Borrower has applied funds
provided pursuant to this Note for purposes other than those authorized by
Lender; or (E)&nbsp;Lender in good faith believes itself insecure. &#160;<b><font style="font-weight:bold;">This revolving line of
credit shall not be subject to Ch. 346 of the Texas Finance Code.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .5pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .5pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">RENEWAL AND EXTENSION.</font></b>&#160; This Note is given in renewal and extension
and not in novation of the following described indebtedness:&#160; The Promissory Note dated April 26, 2005 in
the amount of Five Hundred Thousand &amp; 00/100 ($500,000.00), from Borrower
to Lender.</p>

<p style="background:white;margin:0in 0in .0001pt .5pt;"><b><font size="1" face="Times New Roman" style="font-size:5.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .5pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SUCCESSOR INTERESTS.</font></b> &#160;The terms of this Note shall be
binding upon Borrower, and upon Borrower&#146;s heirs, personal representatives,
successors and assigns, and shall inure to the benefit of Lender and its
successors and assigns.</p>

<p style="background:white;margin:0in 0in .0001pt .5pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">GENERAL PROVISIONS.</font></b> &#160;If any part of this Note cannot
be enforced, this fact will not affect the rest of the Note. Borrower does not
agree or intend to pay, and Lender does not agree or intend to contract for,
charge, collect, take, reserve or receive (collectively referred to herein as &#147;charge or collect&#148;), any amount
in the nature of interest or in the nature of a fee for this loan, which would
in any way or event (including demand, prepayment, or acceleration) cause
Lender to charge or collect more for this loan than the maximum Lender would be
permitted to charge or collect by federal law or the law of the State of Texas
(as applicable). Any such excess interest or unauthorized fee shall, instead of
anything stated to the contrary, be applied first to reduce the principal
balance of this loan, and when the principal has been paid in full, be refunded
to Borrower. The right to accelerate maturity of sums due under this Note does
not include the right to accelerate any interest which has not otherwise
accrued on the date of such acceleration, and Lender does not intend to charge
or collect any unearned interest in the event of acceleration. All sums paid or
agreed to be paid to Lender for the use, forbearance or detention of sums due
hereunder shall, to the extent permitted by applicable law, be amortized,
prorated, allocated and spread throughout the full term of the loan evidenced
by this Note until payment in full so that the rate or amount of interest on
account of the loan evidenced hereby does not exceed the applicable usury
ceiling. Lender may delay or forgo enforcing any of its rights or remedies
under this Note without losing them. Borrower and any other person who signs,
guarantees or endorses this Note, to the extent allowed by law, waive
presentment, demand for payment, notice of dishonor, notice of intent to
accelerate the maturity of this Note, and notice of acceleration of the
maturity of this Note. Upon any change in the terms of this Note, and unless
otherwise expressly stated in writing, no party who signs this Note, whether as
maker, guarantor, accommodation maker or endorser, shall be released from liability.
All such parties agree that Lender may renew or extend (repeatedly and for any
length of time) this loan or release any party or guarantor or collateral; or
impair, fail to realize upon or perfect Lender&#146;s security interest in the
collateral without the consent of or notice to anyone. All such parties also
agree that Lender may modify this loan without the consent of or notice to
anyone other than the party with whom the modification is made. The obligations
under this Note are joint and several.</p>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>

<div style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">PRIOR TO SIGNING THIS NOTE, BORROWER READ AND UNDERSTOOD ALL THE
PROVISIONS OF THIS NOTE, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS.
BORROWER AGREES TO THE TERMS OF THE NOTE.</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">BORROWER ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THIS PROMISSORY
NOTE.</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">BORROWER:</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC INDUSTRIES, INC.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">By:</font></b></p>
  </td>
  <td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:39.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;/s/ Wayne Whitener</font></p>
  </td>
  <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="78%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:78.56%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Wayne
  Whitener, President &amp; CEO of TGC<br>
  Industries,&nbsp;Inc.</font></b></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">LENDER:</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SOVEREIGN BANK, N.A.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.38%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">X</font></p>
  </td>
  <td width="47%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:47.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Stephanie Baird Velasquez</font></p>
  </td>
  <td width="33%" valign="top" style="padding:0in 0in 0in 0in;width:33.6%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="16%" valign="top" style="padding:0in 0in 0in 0in;width:16.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.38%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="47%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:47.62%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Stephanie
  Baird Velasquez, Senior Vice President</font></b></p>
  </td>
  <td width="33%" valign="top" style="padding:0in 0in 0in 0in;width:33.6%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="16%" valign="top" style="padding:0in 0in 0in 0in;width:16.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">NOTICE OF FINAL AGREEMENT</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="12%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:12.78%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Principal</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Loan Date</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Maturity</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Loan No</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Call / Coll</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Account</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Officer</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Initials</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.54%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3,500,000.00</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">09-16-2005</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">09-16-2006</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">17003864</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4A / 466</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SBV</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="17" style="border:none;"></td>
  <td width="79" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="75" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="75" style="border:none;"></td>
  <td width="7" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">References in the shaded area are for Lender&#146;s use only and do not
limit the applicability<br>
of this document to any particular loan or item.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Any item above containing &#147;* * *&#148; has been omitted due to text length
limitations.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="81" valign="top" style="padding:0in 0in 0in 0in;width:60.75pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Borrower:</font></b></p>
  </td>
  <td width="178" valign="top" style="padding:0in 0in 0in 0in;width:133.65pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC Industries, Inc.<br>
  1304 Summit Avenue, Ste. 2<br>
  Plano, TX 75074</font></b></p>
  </td>
  <td width="24" valign="top" style="padding:0in 0in 0in 0in;width:.25in;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="117" valign="top" style="padding:0in 0in 0in 0in;width:87.6pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="100" valign="top" style="padding:0in 0in 0in 0in;width:75.0pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Lender:</font></b></p>
  </td>
  <td width="140" valign="top" style="padding:0in 0in 0in 0in;width:105.0pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Sovereign Bank, N.A.<br>
  Preston Center<br>
  6060 Sherry Lane<br>
  Dallas, TX 75225</font></b></p>
  </td>
  <td width="20" valign="top" style="padding:0in 0in 0in 0in;width:15.0pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="60" valign="top" style="padding:0in 0in 0in 0in;width:45.0pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">THE WRITTEN LOAN AGREEMENT REPRESENTS THE FINAL AGREEMENT BETWEEN THE
PARTIES AND MAY&nbsp;NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS,
OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN THE PARTIES.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">As
used in this Notice, the following terms have the following meanings:</font></p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Loan.</font></b> The term &#147;Loan&#148; means the following
described loan: B non-precomputed Variable Rate Nondisclosable Revolving Line
of Credit Loan to a Corporation for $3,500,000.00 due on September&nbsp;16,
2006. The reference rate (Sovereign Bank, N.A. Prime Rate as<i><font style="font-style:italic;"> </font></i>determined,
currently equal to Wall Street Journal Prime Rate as quoted in the Southwestern
Addition of the Wall Street Journal, currently 6,500%) is added to the margin
of 1.000%, resulting in an initial rate of 7,500. This is a secured renewal of
the following described indebtedness: The Promissory Note dated April&nbsp;26,
2005 in the amount of Five Hundred Thousand&nbsp;&amp; 00/100 ($500,000.00),
from Borrower to Lender .</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Loan Agreement.</font></b> The term &#147;Loan Agreement&#148;
means one or more promises, promissory notes, agreements, undertakings,
security agreements, deeds of trust or other documents, or commitments, or any combination
of those actions or documents, relating to the Loan, including without
limitation the following:</p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">LOAN DOCUMENTS</font></b></p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.84%;">
  <p style="margin:0in 0in .0001pt;text-indent:.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Corporate Resolution: TGC Industries,&nbsp;Inc.</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Business
  Loan Agreement</font></p>
  </td>
 </tr>
 <tr>
  <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.84%;">
  <p style="margin:0in 0in .0001pt;text-indent:.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Promissory Note</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TX
  Commercial Security Agreement: All Accounts and General</font></p>
  </td>
 </tr>
 <tr>
  <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.84%;">
  <p style="margin:0in 0in .0001pt;text-indent:.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TX National UCC Financing Statement (Rev.
  05/22/02): All</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Intangibles;
  owned by TGC Industries,&nbsp;Inc.</font></p>
  </td>
 </tr>
 <tr>
  <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.84%;">
  <p style="margin:0in 0in .0001pt;text-indent:.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Accounts and General Intangibles; whether</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Disbursement
  Request and Authorization</font></p>
  </td>
 </tr>
 <tr>
  <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.84%;">
  <p style="margin:0in 0in .0001pt;text-indent:.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Notice of Final Agreement</font></p>
  </td>
  <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">W-9
  Request for Taxpayer ID Number and Certification: TGC Industries, Inc.</font></p>
  </td>
 </tr>
</table>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Parties.</font></b> &#160;The term &#147;Parties&#148; means Sovereign Bank, N.A.
and any and all entities or Individuals who are obligated to repay the loan or
have pledged property as security for the Loan, including without limitation
the following:</p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<table border="0" cellspacing="0" cellpadding="0" width="90%" style="border-collapse:collapse;margin-left:.5in;width:90.0%;">
 <tr>
  <td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Borrower:</font></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.64%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="81%" valign="top" style="padding:0in 0in 0in 0in;width:81.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TGC
  Industries, Inc.</font></p>
  </td>
 </tr>
 <tr>
  <td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Grantor(s):</font></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.64%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="81%" valign="top" style="padding:0in 0in 0in 0in;width:81.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TGC
  Industries, Inc.</font></p>
  </td>
 </tr>
</table>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This Notice of Final Agreement
is given by Sovereign Bank, N.A. pursuant to Section&nbsp;26.02 of the Texas
Business and Commerce Code. Each Party who signs below, other than Sovereign
Bank, N.A., acknowledges, represents, and warrants to Sovereign Bank, N.A. that
it has received, read and understood this Notice of Final Agreement. This
Notice is dated September&nbsp;16, 2005.</font></p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">BORROWER:</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC INDUSTRIES, INC.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">By:</font></b></p>
  </td>
  <td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:39.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;/s/ Wayne Whitener</font></p>
  </td>
  <td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="78%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:78.56%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Wayne
  Whitener, President &amp; CEO of&nbsp;TGC<br>
  Industries,&nbsp;Inc.</font></b></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">LENDER:</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SOVEREIGN BANK, N.A.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.38%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">X</font></p>
  </td>
  <td width="47%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:47.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="33%" valign="top" style="padding:0in 0in 0in 0in;width:33.6%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="16%" valign="top" style="padding:0in 0in 0in 0in;width:16.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.38%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="47%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:47.62%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Stephanie
  Baird Velasquez, Senior Vice President</font></b></p>
  </td>
  <td width="33%" valign="top" style="padding:0in 0in 0in 0in;width:33.6%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="16%" valign="top" style="padding:0in 0in 0in 0in;width:16.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">[ILLEGIBLE]</font></p>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<DOCUMENT>
<TYPE>EX-10.2
<SEQUENCE>3
<FILENAME>a05-16471_1ex10d2.htm
<DESCRIPTION>EX-10.2
<TEXT>
<html>

<head>





</head>

<body lang="EN-US">

<div style="font-family:Times New Roman;">

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit 10.2</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">BUSINESS
LOAN AGREEMENT</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="12%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:12.78%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Principal</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Loan Date</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Maturity</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Loan No</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Call / Coll</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Account</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="11%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Officer</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Initials</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:2.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.54%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3,500,000.00</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">09-16-2005</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">09-16-2006</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">17003864</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4A / 466</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:11.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SBV</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.6%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in 0in 0in 0in;width:10.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:1.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="17" style="border:none;"></td>
  <td width="79" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
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  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="75" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="82" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="75" style="border:none;"></td>
  <td width="7" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">References
in the shaded area are for Lender&#146;s use only and do not limit the applicability<br>
of this document to any particular loan or item.</font></p>

<p align="center" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman"><font style="font-size:10.0pt;">Any
item above containing </font>&#147;* * *&#148;</font> has been omitted due to text length limitations.</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="81" valign="top" style="padding:0in 0in 0in 0in;width:60.75pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Borrower:</font></b></p>
  </td>
  <td width="173" valign="top" style="padding:0in 0in 0in 0in;width:1.8in;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC Industries, Inc.<br>
  1304 Summit Avenue, Ste. 2<br>
  Plano, TX 75074</font></b></p>
  </td>
  <td width="16" valign="top" style="padding:0in 0in 0in 0in;width:12.15pt;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="90" valign="top" style="padding:0in 0in 0in 0in;width:67.5pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="90" valign="top" style="padding:0in 0in 0in 0in;width:67.5pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Lender:</font></b></p>
  </td>
  <td width="145" valign="top" style="padding:0in 0in 0in 0in;width:108.95pt;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Sovereign
  Bank, N.A.<br>
  Preston Center<br>
  6060 Sherry Lane<br>
  Dallas, TX 75225</font></b></p>
  </td>
  <td width="35" valign="top" style="padding:0in 0in 0in 0in;width:26.05pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="90" valign="top" style="padding:0in 0in 0in 0in;width:67.5pt;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">THIS BUSINESS LOAN AGREEMENT</font></b> dated September 16, 2005, is made
and executed between TGC Industries, Inc. (&#147;Borrower&#148;) and Sovereign
Bank, N.A. (&#147;Lender&#148;) on the following terms and conditions. Borrower has
received prior commercial loans from Lender or has applied to Lender for a commercial loan or loans or other
financial accommodations, including those which may be described on any exhibit
or schedule&nbsp;attached to this Agreement (&#147;Loan&#148;). Borrower understands and
agrees that: (A)&nbsp;in granting, renewing, or extending any Loan, Lender is relying upon Borrower&#146;s
representations, warranties, and agreements as set forth in this Agreement; (B)&nbsp;the
granting, renewing, or extending of any Loan by Lender at all times shall be
subject to Lender&#146;s sole judgment and discretion; and (C)&nbsp;all such Loans
shall be and remain subject to the terms and conditions of this Agreement.</p>

<p style="background:white;margin:0in 0in .0001pt 25.9pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TERM.</font></b> &#160;This Agreement shall be effective as of September&nbsp;16,
2005, and shall continue in
full force and effect until such time as all of Borrower&#146;s Loans in favor of
Lender have been paid in full, including principal, interest, costs, expenses,
attorneys&#146; fees, and other fees and charges, or until September&nbsp;16, 2006.</p>

<p style="background:white;margin:0in 0in .0001pt 25.9pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CONDITIONS PRECEDENT TO EACH ADVANCE.</font></b> &#160;Lender&#146;s
obligation to make the Initial Advance and each subsequent Advance under this
Agreement shall be subject to the fulfillment to Lender&#146;s satisfaction of all of the conditions set forth in
this Agreement and in the Related Documents.</p>

<p style="background:white;margin:0in 0in .0001pt 25.7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Loan Documents.</font></b> &#160;Borrower shall provide to Lender the following
documents for the Loan: (1) the Note; (2)&nbsp;Security Agreements granting to
Lender security interests in the Collateral; (3)&nbsp;financing statements and
all other documents perfecting Lender&#146;s Security Interests; (4)&nbsp;evidence
of insurance as required below; (5)&nbsp;together with all such Related
Documents as Lender may require for the Loan; all in form and substance
satisfactory to Lender and Lender&#146;s counsel.</p>

<p style="background:white;margin:0in 0in .0001pt 40.1pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Borrower&#146;s Authorization.</font></b> &#160;Borrower shall have provided in form and
substance satisfactory to Lender properly certified resolutions, duly
authorizing the execution and delivery of this Agreement, the Note and the
Related Documents. In addition, Borrower shall have provided such other
resolutions, authorizations, documents and instruments as Lender or its
counsel, may require.</p>

<p style="background:white;margin:0in 0in .0001pt .55in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Payment of Fees and Expenses.</font></b> &#160;Borrower shall have paid to Lender all fees,
charges, and other expenses which are then due and payable as specified in this
Agreement or any Related Document.</p>

<p style="background:white;margin:0in 0in .0001pt 39.85pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Representations and Warranties.</font></b> &#160;The
representations and warranties set forth in this Agreement, in the Related
Documents, and in any document or certificate delivered to Lender under this
Agreement are true and correct.</p>

<p style="background:white;margin:0in 0in .0001pt .55in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">No Event of Default.</font></b> &#160;There
shall not exist at the time of any Advance a condition which would constitute
an Event of Default under this Agreement or under any Related Document.</p>

<p style="background:white;margin:0in 0in .0001pt 39.85pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">REPRESENTATIONS AND WARRANTIES.</font></b> &#160;Borrower represents and warrants to Lender, as
of the date of this Agreement, as of the date of each disbursement of loan
proceeds, as of the date of any renewal, extension or modification of any Loan,
and at all times any Indebtedness, exists:</p>

<p style="background:white;margin:0in 0in .0001pt 25.45pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Organization.</font></b> &#160;Borrower is a corporation for profit which is,
and at all times shall be, duly organized, validly existing, and in good
standing under and by virtue of the laws of the State of Texas. Borrower is
duly authorized to transact business in all other states in which Borrower is
doing business, having obtained all necessary filings, governmental licenses
and approvals for each state in which Borrower is doing business. Specifically,
Borrower is, and at all times shall be, duly qualified as a foreign corporation
in all states in which the failure to so qualify would have a material adverse
effect on its business or financial condition. Borrower has the full power and
authority to own its properties and to transact the business in which it is
presently engaged or presently proposes to engage. Borrower maintains an office
at 1304 Summit Avenue, Ste. 2, Plano, TX 75074. Unless Borrower has designated
otherwise in writing, the principal office is the office at which Borrower
keeps its books and records including its records concerning the Collateral.
Borrower will notify Lender prior to any change in the location of Borrower&#146;s
state of organization or any change in Borrower&#146;s name. Borrower shall do all
things necessary to preserve and to keep in full force and effect its
existence, rights and privileges, and shall comply with all regulations, rules, ordinances,
statutes, orders and decrees of any governmental or quasi-governmental authority
or court applicable to Borrower and Borrower&#146;s business activities.</p>

<p style="background:white;margin:0in 0in .0001pt .55in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Assumed Business Names.</font></b> &#160;Borrower has filed or recorded all documents
or filings required by law relating to all assumed business names used by
Borrower. Excluding the name of Borrower, the following is a complete list of
all assumed business names under which Borrower does business:<b><font style="font-weight:bold;"> None.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt 39.35pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Authorization.</font></b> &#160;Borrower&#146;s execution, delivery, and
performance of this Agreement and all the Related Documents have been duly
authorized by all necessary action by Borrower and do not conflict with, result
in a violation of, or constitute a default under (1)&nbsp;any provision of (a)&nbsp;Borrower&#146;s
articles of incorporation or organization, or bylaws, or (b)&nbsp;any agreement
or other instrument binding upon Borrower or (2)&nbsp;any law, governmental
regulation, court decree, or order applicable to Borrower or to Borrower&#146;s
properties.</p>

<p style="background:white;margin:0in 0in .0001pt 39.35pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Financial Information.</font></b> &#160;Each
of Borrower&#146;s financial statements supplied to Lender truly and completely
disclosed Borrower&#146;s financial condition as of the date of the statement, and
there has been no material adverse change in Borrower&#146;s financial condition
subsequent to the date of the most recent financial statement supplied to
Lender. Borrower has no material contingent obligations except as disclosed in
such financial statements.</p>

<p style="background:white;margin:0in 0in .0001pt 39.1pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Legal Effect.</font></b> &#160;This
Agreement constitutes, and any instrument or agreement Borrower is required to
give under this Agreement when delivered will constitute legal, valid, and
binding obligations of Borrower enforceable against Borrower in accordance with
their respective terms.</p>

<p style="background:white;margin:0in 0in .0001pt 39.1pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Properties.</font></b> &#160;Except
as contemplated by this Agreement or as previously disclosed in Borrower&#146;s
financial statements or in writing to Lender and as accepted by Lender, and
except for property tax liens for taxes not presently due and payable, Borrower
owns and has good title to all of Borrower&#146;s properties free and clear of all
Security Interests, and has not executed any security documents or financing
statements relating to such properties. All of Borrower&#146;s properties are titled
in Borrower&#146;s legal name, and Borrower has not used or filed a financing
statement under any other name for at least the last five (5)&nbsp;years.</p>

<p style="background:white;margin:0in 0in .0001pt 38.65pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Hazardous Substances.</font></b> &#160;Except
as disclosed to and acknowledged by Lender in writing, Borrower represents and
warrants that: (1)&nbsp;During the period of Borrower&#146;s ownership of the
Collateral, there has been no use, generation, manufacture, storage, treatment,
disposal, release or threatened release of any Hazardous Substance by any
person on, under, about or from any of the Collateral. (2)&nbsp;Borrower has no
knowledge of, or reason to believe that there has been (a)&nbsp;any breach or
violation of any Environmental Laws; (b)&nbsp;any use, generation, manufacture,
storage, treatment, disposal, release or threatened release of any Hazardous
Substance on, under, about or from the Collateral by any prior owners or
occupants of any of the Collateral; or (c)&nbsp;any actual or threatened
litigation or claims of any kind by any person relating to such matters. (3)&nbsp;Neither
Borrower nor any tenant, contractor, agent or other authorized user of any of
the Collateral shall use, generate, manufacture, store, treat, dispose of or
release any Hazardous Substance on, under, about or from any of the Collateral;
and any such activity shall be conducted in compliance with all applicable
federal, state, and local laws, regulations, and ordinances, including without
limitation all Environmental Laws. Borrower authorizes Lender and its agents to
enter upon the Collateral to make such inspections and tests as Lender may deem
appropriate to determine compliance of the Collateral with this section&nbsp;of
the Agreement. Any inspections or tests made by Lender shall be at Borrower&#146;s
expense and for Lender&#146;s purposes only and shall not be construed to create any
responsibility or liability on the part of Lender to Borrower or to any other
person. The representations and warranties contained herein are based on
Borrower&#146;s due diligence in investigating the Collateral for hazardous waste
and Hazardous Substances. Borrower hereby (1)&nbsp;releases and waives any
future claims against Lender for indemnity or contribution in the event
Borrower becomes liable for cleanup or other costs under any such laws, and (2)&nbsp;agrees to indemnify and hold
harmless Lender against any and all claims, losses, liabilities, damages,
penalties, and expenses which Lender may directly or indirectly sustain or
suffer resulting from a breach of this section&nbsp;of the Agreement or as a
consequence of any use, generation, manufacture, storage, disposal, release or
threatened release of a hazardous waste or substance on the Collateral. The
provisions of this section&nbsp;of the Agreement, including the obligation to
indemnify, shall survive the payment of the indebtedness and the termination,
expiration or satisfaction of this Agreement and shall not be affected by
Lender&#146;s acquisition of any interest in any of the Collateral, whether by
foreclosure or otherwise.</p>

<p style="background:white;margin:0in 0in .0001pt 38.15pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Litigation and Claims.</font></b> &#160;No
litigation, claim, investigation, administrative proceeding or similar action
(including those for unpaid taxes) against Borrower is pending or threatened,
and no other event has occurred which may materially adversely affect
Borrower's financial condition or properties, other than litigation, claims, or
other events, if any, that have been disclosed to and acknowledged by Lender in
writing.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
<!-- SEQ.=1,FOLIO='',FILE='C:\JMS\mnelson\05-15384-2\task583949\15384-2-kh.htm',USER='jpatrow',CD='Sep 20 16:11 2005' -->


<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Taxes.</font></b> &#160;To the
best of Borrower&#146;s knowledge, all of Borrower&#146;s tax returns and reports that are or were required to be filed,
have been filed, and all taxes, assessments and other governmental charges have
been paid in full, except those
presently being or to be contested by Borrower in good faith in the ordinary course of business and
for which adequate reserves have been provided.</p>

<p style="background:white;margin:0in 0in .0001pt .2in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Lien Priority.</font></b> &#160;Unless
otherwise previously disclosed to Lender in writing, Borrower has not entered
into or granted any Security Agreements, or permitted the filing or attachment
of any Security Interests on or affecting any of the Collateral directly or
indirectly securing repayment of Borrower&#146;s Loan and Note, that would be prior
or that may in any way be superior to Lender&#146;s Security Interests and rights in
and to such Collateral.</p>

<p style="background:white;margin:0in 0in .0001pt 14.15pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Binding Effect.</font></b> &#160;This
Agreement, the Note, all Security Agreements (if any), and all Related
Documents are binding upon the signers thereof, as well as upon their
successors, representatives and assigns, and are legally enforceable in
accordance with their respective terms.</p>

<p style="background:white;margin:0in 0in .0001pt .2in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">AFFIRMATIVE COVENANTS.</font></b> &#160;Borrower covenants and agrees
with Lender that, so long as this Agreement remains in effect, Borrower will:</p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Notices of Claims and Litigation.</font></b> &#160;Promptly inform Lender in writing of (1)&nbsp;all
material adverse changes in Borrower&#146;s financial condition, and (2)&nbsp;all
existing and all threatened litigation, claims, investigations, administrative
proceedings or similar actions affecting Borrower or any Guarantor which could
materially affect the financial condition of Borrower or the financial
condition of any Guarantor.</p>

<p style="background:white;margin:0in 0in .0001pt 14.15pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Financial Records.</font></b> &#160;Maintain its books and records in accordance
with GAAP, applied on a consistent basis, and permit Lender to examine and
audit Borrower&#146;s books and records at all reasonable times.</p>

<p style="background:white;margin:0in 0in .0001pt .2in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Financial Statements.</font></b> &#160;Furnish Lender with the following:</p>

<p style="background:white;margin:0in 0in .0001pt .2in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Interim Statements.</font></b> &#160;As soon as available, but in no
event later than 45 days after the end of each fiscal quarter, Borrower&#146;s
balance sheet and profit and loss statement for the period ended, prepared by
Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt 28.3pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Tax Returns.</font></b> &#160;As soon as available, but in no event later
than ninety (90) days after the applicable filing date for the tax reporting
period ended, Federal and other governmental tax returns, prepared by Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt 28.3pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">All financial reports required to be provided under
this Agreement shall be prepared in accordance with GAAP, applied on a
consistent basis, and certified by Borrower as being true and correct.</font></p>

<p style="background:white;margin:0in 0in .0001pt 13.9pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Additional Information.</font></b> &#160;Furnish such additional information and
statements, as Lender may request from time to time.</p>

<p style="background:white;margin:0in 0in .0001pt 14.15pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Financial Covenants and Ratios.</font></b> &#160;Comply
with the following covenants and ratios:</p>

<p style="background:white;margin:0in 0in .0001pt 14.15pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Other Requirements.</font></b> &#160;Monthly Accounts Receivables
aging due within 10 days of month end. </p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Monthly borrowing base certificate due within 30 days of month end.</font></p>

<p style="background:white;margin:0in 0in .0001pt 28.1pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Eligible Accounts Receivable:</font></b> Accounts less than 90 days past due; entire Accounts Receivables with
any portion over 90 days is excluded from eligible Accounts Receivables.</p>

<p style="background:white;margin:0in 0in .0001pt 28.1pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Revolving Line of Credit shall be rested for a minimum of 30 consecutive
days every 12 months.</font></p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Borrower shall maintain minimum liquidity of $500,000.00.</font></p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Borrower shall have a maximum debt/worth ratio of 1.50X.</font></p>

<p style="background:white;margin:0in 0in .0001pt 28.1pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Except as provided above, all computations made to determine compliance
with the requirements contained in this paragraph shall be made in accordance
with generally accepted accounting principles, applied on a consistent basis,
and certified by Borrower as being true and correct.</font></p>

<p style="background:white;margin:0in 0in .0001pt 27.85pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Insurance.</font></b> &#160;Maintain fire and other risk insurance, public
liability insurance, and such other insurance as Lender may require with
respect to Borrower&#146;s properties and operations, in form, amounts, and
coverages reasonably acceptable to Lender and by insurance companies authorized
to transact business in Texas. <b><font style="font-weight:bold;">BORROWER MAY&nbsp;FURNISH
THE INSURANCE REQUIRED BY THIS AGREEMENT WHETHER THROUGH EXISTING POLICIES
OWNED OR CONTROLLED BY BORROWER OR THROUGH EQUIVALENT COVERAGE FROM ANY
INSURANCE COMPANY AUTHORIZED TO TRANSACT BUSINESS IN TEXAS.</font></b>
Borrower, upon request of Lender, will deliver to Lender from time to time the
policies or certificates of insurance in form satisfactory to Lender, including
stipulations that coverages will not be cancelled or diminished without at
least thirty (30) days prior written notice to Lender. Each insurance policy
also shall include an endorsement providing that coverage in favor of Lender will not be impaired in any
way by any act, omission or default of Borrower or any other person. In
connection with all policies covering assets in which Lender holds or is
offered a security interest for the Loans, Borrower will provide Lender with
such lender&#146;s loss payable or other endorsements as Lender may require.</p>

<p style="background:white;margin:0in 0in .0001pt 13.7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Insurance Reports.</font></b> &#160;Furnish
to Lender, upon request of Lender, reports on each existing insurance policy
showing such information as Lender may reasonably request, including without
limitation the following: (1)&nbsp;the name of the insurer; (2)&nbsp;the risks
insured; (3)&nbsp;the amount of the policy; (4)&nbsp;the properties insured; (5)&nbsp;the
then current property values on the basis of which insurance has been obtained, and the manner of determining
those values; and (6) the expiration date of the policy. In addition, upon
request of Lender (however not more often than annually), Borrower will have an
independent appraiser satisfactory to Lender determine, as applicable, the
actual cash value or replacement cost of any Collateral. The cost of such
appraisal shall be paid by Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt 13.45pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Other Agreements.</font></b> &#160;Comply
with all terms and conditions of all other agreements, whether now or hereafter
existing, between Borrower and any other party and notify Lender immediately in
writing of any default in connection with any other such agreements.</p>

<p style="background:white;margin:0in 0in .0001pt 13.45pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Loan Proceeds.</font></b> &#160;Use
all Loan proceeds solely for Borrower&#146;s business operations, unless
specifically consented to the contrary by Lender in writing.</p>

<p style="background:white;margin:0in 0in .0001pt 13.7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Taxes, Charges and Liens.</font></b> &#160;Pay
and discharge when due all of its indebtedness and obligations, including
without limitation all assessments, taxes, governmental charges, levies and
liens, of every kind and nature, imposed upon Borrower or its properties,
income, or profits, prior to the date on which penalties would attach, and all
lawful claims that, if unpaid, might become a lien or charge upon any of
Borrower&#146;s properties, income, or profits.</p>

<p style="background:white;margin:0in 0in .0001pt 13.45pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Performance.</font></b> &#160;Perform
and comply, in a timely manner, with all terms, conditions, and provisions set
forth in this Agreement, in the Related Documents, and in all other instruments
and agreements between Borrower and Lender. Borrower shall notify Lender
immediately in writing of any default in connection with any agreement.</p>

<p style="background:white;margin:0in 0in .0001pt 13.2pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Operations.</font></b> &#160;Maintain executive and management personnel
with substantially the same qualifications and experience as the present
executive and management personnel; provide written notice to Lender of any
change in executive and management personnel; conduct its business affairs in a
reasonable and prudent manner.</p>

<p style="background:white;margin:0in 0in .0001pt 13.2pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Environmental Studies.</font></b> &#160;Promptly conduct and complete, at Borrower&#146;s
expense, all<i><font style="font-style:italic;"> </font></i>such investigations,
studies, samplings and testings as may be requested by Lender of any
governmental authority relative to any substance, or any waste or by-product of
any substance defined as toxic or a hazardous substance under applicable
federal, state, or local law, rule, regulation, order or directive, at or
affecting any property or any facility owned, leased or used by Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt 13.2pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Compliance with Governmental
Requirements.</font></b> &#160;Comply with all laws, ordinances, and
regulations, now or hereafter in effect, of all governmental authorities
applicable to the conduct of Borrower&#146;s properties, businesses and operations,
and to the use or occupancy of the Collateral, including without limitation,
the Americans With Disabilities Act. Borrower may contest in good faith any
such law, ordinance, or regulation and withhold compliance during any
proceeding, including appropriate appeals, so long as Borrower has notified
Lender in writing prior to doing so and so long as, in Lender&#146;s sole opinion,
Lender&#146;s interests in the Collateral are not jeopardized. Lender may require Borrower to post adequate
security or a surety bond, reasonably satisfactory to Lender, to protect Lender&#146;s
interest.</p>

<p style="background:white;margin:0in 0in .0001pt 12.95pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Inspection.</font></b>&#160; Permit
employees or agents of Lender at any reasonable time to inspect any and all Collateral
for the Loan or Loans and Borrower&#146;s other properties and to examine or audit
Borrower&#146;s books, accounts, and records and to make copies and memoranda of
Borrower&#146;s books, accounts, and records. If Borrower now or at any time
hereafter maintains any records (including without limitation computer
generated records and computer software programs for the generation of such
records) in the possession of a third party, Borrower, upon request of Lender,
shall notify such party to permit Lender free access to such records at all
reasonable times and to provide Lender with copies of any records it may
request, all at Borrower&#146;s expense.</p>

<p style="background:white;margin:0in 0in .0001pt 12.95pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Environmental Compliance and
Reports.</font></b> &#160;Borrower shall comply in all respects with any
and all Environmental Laws; not cause or permit to exist, as a result of an
intentional or unintentional action or omission on Borrower&#146;s part or on the
part of any third party, on property owned and/or occupied by Borrower, any
environmental activity where damage may result to the environment, unless such
environmental activity is pursuant to and in compliance with the conditions of
a permit issued by the appropriate federal; state or local governmental
authorities; shall furnish to Lender promptly and in any event within thirty
(30) days after receipt thereof a copy of any notice, summons, lien, citation,
directive, latter or other communication from any governmental agency or
instrumentality concerning any intentional or unintentional action or omission
on Borrower&#146;s part in connection with any environmental activity whether or not
there is damage to the</p>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>

<div style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">environment and/or other natural resources.</font></p>

<p style="background:white;margin:0in 0in .0001pt 15.85pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Additional Assurances.</font></b> &#160;Make,
execute and deliver to Lender such promissory notes, mortgages, deeds of trust,
security agreements, assignments, financing statements, instruments, documents
and other agreements as Lender or its attorneys may reasonably request to
evidence and secure the Loans and to<i><font style="font-style:italic;"> </font></i>perfect
all Security Interests.</p>

<p style="background:white;margin:0in 0in .0001pt 16.1pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">LENDER&#146;S EXPENDITURES.</font></b> &#160;If any action or proceeding is
commenced that would materially affect Lender&#146;s Interest in the Collateral or if
Borrower fails to comply with any provision of this Agreement or any Related
Documents, including but not limited to Borrower&#146;s failure to discharge or pay
when due any amounts Borrower is required to discharge or pay under this
Agreement or any Related Documents, Lender on Borrower&#146;s behalf may (but shall
not be obligated to) take any action that Lender deems appropriate, including
but not limited to discharging or paying all<i><font style="font-style:italic;"> </font></i>taxes, liens, security interests, encumbrances and other claims, at
any time levied or placed on any Collateral and paying all<i><font style="font-style:italic;"> </font></i>costs for insuring, maintaining and
preserving any Collateral. All such expenditures paid by Lender for such
purposes will then bear interest at the Note rate from the date paid by Lender
to the date of repayment by Borrower. To the extent permitted by applicable
law, all such expenses will become a part
of the Indebtedness and, at Lender&#146;s option, will (A)&nbsp;be payable on
demand; (B)&nbsp;be added to the balance of the Note and be apportioned among
and be payable with any installment payments to become due during either (1)&nbsp;the
term of any applicable insurance policy; or (2)&nbsp;the remaining term of the
Note; or (C)&nbsp;be treated as a balloon payment which will be due and payable
at the Note&#146;s maturity.</p>

<p style="background:white;margin:0in 0in .0001pt 1.9pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">NEGATIVE COVENANTS.</font></b> &#160;Borrower covenants and agrees
with Lender that while this Agreement is in effect. Borrower shall not, without
the prior written consent of Lender:</p>

<p style="background:white;margin:0in 0in .0001pt 1.7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Indebtedness and Liens.</font></b> &#160;Sell
with recourse any of Borrower&#146;s accounts, except to Lender.</p>

<p style="background:white;margin:0in 0in .0001pt 15.6pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Continuity of Operations.</font></b> &#160;(1)&nbsp;Engage
in any business activities substantially different than those in which Borrower
is presently engaged, (2)&nbsp;cease
operations, liquidate, merge, transfer, acquire or consolidate with any other
entity, change its name, dissolve or transfer or sell Collateral out of the
ordinary course of business, or (3)&nbsp;pay any dividends on Borrower&#146;s stock
(other than dividends payable in its stock), provided, however that
notwithstanding the foregoing, but only so long as no Event of Default has
occurred and is continuing or would result from the payment of dividends, if
Borrower is a &#147;Subchapter S Corporation&#148; (as defined in the Internal Revenue
Code of 1986, as amended). Borrower may pay cash dividends on its stock to its
shareholders from time to time in amounts necessary to enable the shareholders
to pay income taxes and make estimated income tax payments to satisfy their
liabilities under federal and state law which arise solely from their status as
Shareholders of a Subchapter S Corporation because of their ownership of shares
of Borrower&#146;s stock, or purchase or retire any of Borrower&#146;s outstanding shares
or alter or amend Borrower&#146;s capital structure.</p>

<p style="background:white;margin:0in 0in .0001pt 15.35pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Agreements.</font></b> &#160;Borrower will not enter into any agreement
containing any provisions which would be violated or breached by the
performance of Borrower&#146;s obligations under this Agreement or in connection
herewith.</p>

<p style="background:white;margin:0in 0in .0001pt 15.35pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CESSATION OF ADVANCES.</font></b> &#160;If Lender has made any
commitment to make any Loan to Borrower, whether under this Agreement or under any other agreement, Lender
shall have no obligation to make Loan Advances or to disburse Loan proceeds if:
(A)&nbsp;Borrower or any Guarantor is in default under the terms of this
Agreement or any of the Related Documents or any other agreement that Borrower
or any Guarantor has with Lender; (B)&nbsp;Borrower or any Guarantor dies,
becomes incompetent or becomes insolvent, files a petition in bankruptcy or
similar proceedings, or is adjudged a bankrupt; (C)&nbsp;there occurs a material adverse change in Borrower&#146;s
financial condition, in the financial condition of any Guarantor, or in the
value of any Collateral securing any Loan; or (D)&nbsp;any Guarantor seeks,
claims or otherwise attempts to limit, modify or revoke such Guarantor&#146;s
guaranty of the Loan or any other loan with Lender; or (E)&nbsp;Lender in good
faith deems itself insecure, even though no Event of Default shall have
occurred.</p>

<p style="background:white;margin:0in 0in .0001pt 1.2pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">RIGHT OF SETOFF.</font></b> &#160;To the extent permitted by applicable
law, Lender reserves a right of setoff in all Borrower&#146;s accounts with Lender
(whether checking, savings, or some other account). This includes all accounts
Borrower holds jointly with someone else and all accounts Borrower may open in
the future. However, this does not include any IRA or Keogh accounts, or any
trust accounts for which setoff would be prohibited by law. Borrower authorizes
Lender, to the extent permitted by applicable law, to charge or setoff all sums
owing on the Indebtedness against any and all such accounts.</p>

<p style="background:white;margin:0in 0in .0001pt 1.2pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">DEFAULT.</font></b> &#160;Each of the following shall constitute an
Event of Default under this Agreement:</p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Payment Default.</font></b> &#160;Borrower fails to make any payment when due
under the Loan.</p>

<p style="background:white;margin:0in 0in .0001pt 15.1pt;text-indent:-13.7pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Other Defaults.</font></b> &#160;Borrower fails to comply with or to perform
any other term, obligation, covenant or condition contained in this Agreement
or in any of the Related Documents or to comply with or to perform any term,
obligation, covenant or condition contained in any other agreement between
Lender and Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt 15.35pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Default in Favor of Third
Parties.</font></b> &#160;Borrower or any Grantor defaults under any
loan, extension of credit, security agreement, purchase or sales agreement, or
any other agreement, in favor of any other creditor or person that may
materially affect any of Borrower&#146;s or any Grantor&#146;s property or Borrower&#146;s or
any Grantor&#146;s ability to repay the Loans or perform their respective
obligations under this Agreement or any of the Related Documents.</p>

<p style="background:white;margin:0in 0in .0001pt 14.9pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">False Statements.</font></b> &#160;Any
warranty, representation or statement made or furnished to Lender by Borrower
or on Borrower&#146;s behalf under this Agreement or the Related Documents is false
or misleading in any material respect, either now or at the time made or
furnished or becomes false or misleading at any time thereafter.</p>

<p style="background:white;margin:0in 0in .0001pt 14.9pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Insolvency.</font></b> &#160;The
dissolution or termination of Borrower&#146;s existence as a going business, the
insolvency of Borrower, the appointment of a receiver for any part of Borrower&#146;s
property, any assignment for the benefit of creditors, any type of creditor
workout, or the commencement of any proceeding under any bankruptcy or
insolvency laws by or against Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt 15.1pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Defective Collateralization.</font></b> &#160;This
Agreement or any of the Related Documents ceases to be in full force and effect
(including failure of any collateral document to create a valid and perfected
security interest or lien) at any time and for any reason.</p>

<p style="background:white;margin:0in 0in .0001pt 14.65pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Creditor or Forfeiture Proceedings.</font></b> &#160;Commencement of foreclosure or forfeiture
proceedings, whether by judicial proceeding, self-help, repossession or any
other method, by any creditor of Borrower or by any governmental agency against
any collateral securing the Loan. This includes a garnishment of any of
Borrower&#146;s accounts, including deposit accounts, with Lender. However, this
Event of Default shall not apply if there is a good faith dispute by Borrower on
to the validity or reasonableness of the claim which in the basis of the
creditor or forfeiture proceeding and if Borrower gives Lender written notice
of the creditor or forfeiture proceeding and deposits with Lender monies or a
surety bond for the creditor or forfeiture proceeding. In an amount determined
by Lender, in its sole discretion, as being an adequate reserve or bond for the
dispute.</p>

<p style="background:white;margin:0in 0in .0001pt 14.65pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Events Affecting Guarantor.</font></b> &#160;Any of
the preceding events occurs with respect to any Guarantor of any of the
Indebtedness or any Guarantor dies or becomes incompetent, or revokes or
disputes the validity of, or
liability under, any Guaranty of the
Indebtedness.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Change in Ownership.</font></b> &#160;Any
change in ownership of twenty-five percent (25%) or more of the common stock of
Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt 14.9pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Adverse Change.</font></b> &#160;A
material adverse change occurs in Borrower&#146;s financial condition, or Lender
believes the prospect of payment or performance of the Loan is impaired.</p>

<p style="background:white;margin:0in 0in .0001pt 14.65pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Insecurity.</font></b> &#160;Lender
in good faith believes itself insecure.</p>

<p style="background:white;margin:0in 0in .0001pt 14.65pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EFFECT OF AN EVENT OF DEFAULT.</font></b> &#160;If any Event of Default shall
occur, except where otherwise provided in this Agreement or the Related
Documents, all commitments and obligations of Lender under this Agreement or
the Related Documents or any other agreement immediately will terminate (including
any obligation to make further Loan Advances or disbursements), and, at Lender&#146;s
option, all Indebtedness immediately will become due and payable, all without
notice of any kind to Borrower, except that in the case of an Event of Default
of the type described in the &#147;Insolvency&#148; subsection&nbsp;above, such
acceleration shall be automatic and not optional. In addition, Lender shall
have all the rights and remedies provided in the Related Documents or available
at law, in equity, or otherwise. Except as may be prohibited by applicable law,
all of Lender&#146;s rights and remedies shall be cumulative and may be exercised
singularly or concurrently. Election by Lender to pursue any remedy shall not
exclude pursuit of any other remedy, and an election to make expenditures or to
take action to perform an obligation of Borrower or of any Grantor shall not
affect Lender&#146;s right to declare a default and to exercise its rights and
remedies.</p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">MISCELLANEOUS PROVISIONS.</font></b> &#160;The following miscellaneous
provisions are a part of this Agreement:</p>

<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman">&nbsp;</font></b></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Amendments.</font></b>&#160; This Agreement, together with any Related
Documents, constitutes the entire understanding and agreement of the parties as
to the matters set forth in this Agreement.&#160;
No alteration of or amendment to this Agreement shall be effective
unless given in writing and signed by the party or parties sought to be charged
or bound by the alteration or amendment.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Attorneys&#146; Fees; Expenses.</font></b> &#160;Borrower agrees to pay upon demand all of
Lender&#146;s costs and expenses, including Lender&#146;s reasonable attorneys&#146; fees and
Lender&#146;s legal expenses, incurred in connection with the enforcement of this
Agreement. Lender may hire or pay someone else to help enforce this Agreement,
and Borrower shall pay the costs and expenses of such enforcement. Costs and
expenses include Lender&#146;s reasonable attorneys&#146; fees and legal expenses whether
or not there is a lawsuit, including Lender&#146;s reasonable attorneys&#146; fees and legal
expenses for bankruptcy proceedings (including efforts to modify or vacate any
automatic stay or injunction), appeals, and any anticipated post-judgment
collection services. Borrower also shall pay all court costs and such
additional fees as may be directed by the court.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Caption Headings.</font></b> &#160;Caption headings in this Agreement are for
convenience purposes only and are not to be used to interpret or define the
provisions of this Agreement.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Consent to Loan Participation.</font></b> &#160;Borrower
agrees and consents to Lender&#146;s sale or transfer, whether now or later, of one
or more participation interests in the Loan to one or more purchasers, whether
related or unrelated to Lender. Lender may provide, without any limitation
whatsoever, to any one or more purchasers, or potential purchasers, any
information or knowledge Lender may have about Borrower or about any other
matter relating to the Loan, and Borrower hereby waives any rights to privacy
Borrower may have with respect to such matters. Borrower additionally waives
any and all notices of sale of participation interests, as well as all notices
of any repurchase of such participation interests. Borrower also agrees that
the purchasers of any such participation interests will be considered as the
absolute owners of such interests in the Loan and will have all the rights
granted under the participation agreement or agreements governing the sale of
such participation interests. Borrower further waives all rights of offset or
counterclaim that it may have now or later against Lender or against any
purchaser of such a participation interest and unconditionally agrees that
either Lender or such purchaser may enforce Borrower&#146;s obligation under the
Loan irrespective of the failure or insolvency of any holder of any interest in the Loan. Borrower further
agrees that the purchaser of any such participation interests may enforce its
interests irrespective of any personal claims or defenses that Borrower may
have against Lender.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Governing Law.</font></b> &#160;This Agreement
will be governed by federal law applicable to Lender and, to the extent not
preempted by federal law, the laws of the State of Texas without regard to its
conflicts of law provisions. This Agreement has been accepted by Lender in the
State of Texas.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Choice of Venue.</font></b> &#160;If
there is a lawsuit, and if the transaction evidenced by this Agreement occurred
in Dallas County, Borrower agrees upon Lender&#146;s request to submit to the
jurisdiction of the courts of Dallas County, State of Texas.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">No Waiver by Lender.</font></b> &#160;Lender
shall not be deemed to have waived any rights under this Agreement unless such
waiver is given in writing and signed by Lender. No delay or omission on the
part of Lender in exercising any right shall operate as a waiver of such right
or any other right. A waiver by Lender of a provision of this Agreement shall
not prejudice or constitute a waiver of<i><font style="font-style:italic;"> </font></i>Lender&#146;s
right otherwise to demand strict compliance with that provision or any other
provision of this Agreement. No prior waiver by Lender, nor any course of
dealing between Lender and Borrower, or between Lender and any Grantor, shall
constitute a waiver of any of<i><font style="font-style:italic;"> </font></i>Lender&#146;s
rights or of any of Borrower&#146;s or any Grantor&#146;s obligations as to any future
transactions. Whenever the consent of Lender is required under this Agreement,
the granting of such consent by Lender in any instance shall not constitute
continuing consent to subsequent instances where such consent is<i><font style="font-style:italic;"> </font></i>required
and in all cases such consent may be granted or withheld in the sole discretion
of Lender.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Notices.</font></b> &#160;Any
notice required to be given under this Agreement shall be given in writing, and
shall be effective when actually delivered, when actually received by telefacsimile
(unless otherwise required by law), when deposited with a nationally recognized
overnight courier, or, if mailed, when deposited in the United States mail, as
first class, certified or registered mail postage prepaid, directed to the
addresses shown near the beginning of this Agreement. Any party may change its
address for notices under this Agreement by giving formal written notice to the
other parties, specifying that the purpose of the notice is to change the party&#146;s
address. For notice purposes, Borrower agrees to keep Lender informed at all
times of Borrower&#146;s current address. Unless otherwise provided or required by
law, if there is more than one Borrower, any notice given by Lender to any
Borrower is deemed to be notice given to all Borrowers.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Payment of Interest and Fees.</font></b> &#160;Notwithstanding any other provision of this
Agreement or any provision of any Related Document. Borrower does not agree or
intend to pay, and Lender does not agree or intend to charge, collect, take,
reserve or receive (collectively referred to herein as &#147;charge or collect&#148;),
any amount in the nature of interest or in the nature of a fee for the Loan
which would in any way or event (including demand, prepayment, or acceleration)
cause Lender to contract for, charge or collect more for the Loan than the
maximum Lender would be permitted to charge or collect by any applicable
federal or Texas state law. Any such excess interest or unauthorised fee will,
instead of<i><font style="font-style:italic;"> </font></i>anything stated to the
contrary, be applied first to reduce the unpaid principal balance of the Loan,
and when the principal has bean paid in full, be refunded to Borrower.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Severability.</font></b> &#160;If a
court of competent jurisdiction finds any provision of this Agreement to be illegal,
invalid, or unenforceable as to any circumstance, that finding shall not make
the offending provision illegal, invalid, or unenforceable as to any other
circumstance. If feasible, the offending provision shall be considered modified
so that it becomes legal, valid and enforceable. If the offending provision
cannot be so modified, it shall be considered deleted from this Agreement.
Unless otherwise required by law, the illegality, invalidity, or
unenforceability of any provision of this Agreement shall not affect the
legality, validity or enforceability of any other provision of this Agreement.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Subsidiaries and Affiliates of
Borrower.</font></b> &#160;To the extent the context of any provisions of
this Agreement makes it appropriate, including without limitation any
representation, warranty or covenant, the word &#147;Borrower&#148; as used in this
Agreement shall include all of Borrower&#146;s subsidiaries and affiliates.
Notwithstanding the foregoing however, under no circumstances shall this
Agreement be construed to require Lender to make any Loan or other financial
accommodation to any of Borrower&#146;s subsidiaries or affiliates.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Successors and Assigns.</font></b> &#160;All
covenants and agreements by or on behalf of Borrower contained in this
Agreement or any Related Documents shall bind Borrower&#146;s successors and assigns
and shall inure to the benefit of Lender and its successors and assigns.
Borrower shall not, however, have the right to assign Borrower&#146;s rights under this
Agreement or any interest therein, without the prior written consent of Lender.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Survival of Representations and
Warranties.</font></b> &#160;Borrower understands and agrees that in
extending Loan Advances, Lender is relying on all representations, warranties,
and covenants made by Borrower in this Agreement or in any certificate or other
instrument delivered by Borrower to Lender under this Agreement or the Related
Documents. Borrower further agrees that regardless of any investigation made by
Lender, all such representations, warranties and covenants will survive the
extension of Loan Advances and delivery to Lender of the Related Documents,
shall be continuing in nature, shall be deemed made and redated by Borrower at
the time each Loan Advance is made, and shall remain in full force and effect
until such time as Borrower&#146;s Indebtedness shall be paid in full, or until this
Agreement shall be terminated in the manner provided above, whichever is the
last to occur.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Time is of the Essence.</font></b> &#160;Time
is of the essence in the performance of this Agreement.</p>

<p style="background:white;margin:0in 0in .0001pt 14.15pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">DEFINITIONS.</font></b> &#160;The following capitalized words and terms
shall have the following meanings when used in this Agreement. Unless
specifically stated to the contrary, all references to dollar amounts shall
mean amounts in lawful money of the United States of America. Words and terms
used in the singular shall include the plural, and the plural shall include the
singular, as the context may require. Words and terms not otherwise defined in this
Agreement shall have the meanings attributed to such terms in the Uniform
Commercial Code. Accounting words and terms not otherwise defined in this
Agreement shall have the meanings assigned to them in accordance with generally
accepted accounting principles as in effect on the date of this Agreement:</p>

<p style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Advance.</font></b> &#160;The
word &#147;Advance&#148; means a disbursement of Loan funds made, or to be made, to
Borrower or on Borrower&#146;s behalf on a line of credit or multiple advance basis
under the terms and conditions of this Agreement.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Agreement.</font></b> &#160;The
word &#147;Agreement&#148; means this Business Loan Agreement, as this Business Loan
Agreement may be amended or modified from time to time, together with all
exhibits and schedules attached to this Business Loan Agreement from time to
time.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Borrower.</font></b> &#160;The
word &#147;Borrower&#148; means TGC Industries,&nbsp;Inc. and includes all co-signers and
co-makers signing the Note.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Collateral.</font></b> &#160;The
word &#147;Collateral&#148; means all property and assets granted as collateral security
for a Loan, whether real or personal property, whether granted directly or indirectly,
whether granted now or in the future, and whether granted in the form of a
security interest, mortgage, collateral mortgage, deed of trust, assignment,
pledge, crop pledge, chattel mortgage, collateral chattel mortgage, chattel
trust, factor&#146;s lien, equipment trust, conditional sale, trust receipt, lien,
charge, lien or title retention contract, lease or consignment intended as a
security device, or any other security or lien interest whatsoever, whether
created by law, contract, or otherwise.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Environmental Laws.</font></b> &#160;The
words &#147;Environmental Laws&#148; mean any and all state, federal and local statutes,
regulations and ordinances relating to the protection of human health or the
environment, including without limitation the Comprehensive Environmental
Response, Compensation, and Liability Act of 1980, as amended, 42 U.S.C. Section&nbsp;9601,
et seq. (&#147;CERCLA&#148;) the Superfund Amendments and Reauthorization Act of 1986,
Pub. L. No. 99-499 (&#147;SARA&#148;), the Hazardous Materials Transportation Act, 49
U.S.C. Section&nbsp;1801, et seq., the Resource Conservation and Recovery Act,
42 U.S.C. Section&nbsp;8801, et seq., or other applicable state or federal
laws, rules, or regulations adopted pursuant thereto.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Event of Default.</font></b> The words &#147;Event of Default&#148; mean any of the
events of default set forth in this Agreement in the default section of this
Agreement.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">GAAP.</font></b> &#160;The word &#147;GAAP&#148; means generally accepted
accounting principles.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Grantor.</font></b> &#160;The
word &#147;Grantor&#148; means each and all of the persons or entities granting a
Security Interest in any Collateral for the Loan, including without limitation
all Borrowers granting such a Security
Interest.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Guarantor.</font></b> &#160;The
word &#147;Guarantor&#148; means any guarantor, surety, or accommodation party of any or
all of the Loan.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Guaranty.</font></b> &#160;The
word &#147;Guaranty&#148; means the guaranty from Guarantor to Lender, including without
limitation a guaranty of all or part of the Note.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Hazardous Substances.</font></b> &#160;The words
&#147;Hazardous Substances&#148; mean materials that, because of<i><font style="font-style:italic;"> </font></i>their quantity, concentration or
physical, chemical or infectious characteristics, may cause or pose a present
or potential hazard to human health or the environment when improperly used,
treated, stored, disposed of, generated, manufactured, transported or otherwise
handled. The words &#147;Hazardous Substances&#148; are used in their very broadest sense
and include without limitation any and all hazardous or toxic substances, materials
or waste as defined by or listed under the Environmental Laws. The term &#147;Hazardous
Substances&#148; also includes, without limitation, petroleum and petroleum
by-products or any fraction thereof and asbestos.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Indebtedness.</font></b> &#160;The
word &#147;Indebtedness&#148; means the indebtedness evidenced by the Note or Related
Documents, including all principal and interest together with all other
indebtedness and costs and expenses for which Borrower is responsible under this
Agreement or under any of the Related Documents.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Lender.</font></b> &#160;The
word &#147;Lender&#148; means Sovereign Bank, N.A., its successors and assigns.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Loan.</font></b> &#160;The
word &#147;Loan&#148; means any and all loans and financial accommodations from Lender to
Borrower whether now or hereafter existing, and however evidenced, including
without limitation those loans and financial accommodations described herein or
described on any exhibit or schedule&nbsp;attached to this Agreement from time
to time.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Note.</font></b> &#160;The
word &#147;Note&#148; means the Note executed by TGC Industries,&nbsp;Inc. in the
principal amount of $3,500,000.00 dated September&nbsp;16, 2005, together with
all renewals of,<i><font style="font-style:italic;"> </font></i>extensions of,
modifications of, refinancing of, consolidations of, and substitutions for the
note or credit agreement.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Permitted Liens.</font></b> &#160;The
words &#147;Permitted Liens&#148; mean (1)&nbsp;liens and security interests securing indebtedness
owed by Borrower to Lender; (2)&nbsp;liens for taxes, assessments, or similar
charges either not yet due or being contested in good faith; (3)&nbsp;liens of materialmen,
mechanics, warehousemen, or carriers, or other like liens arising in the
ordinary course of business and securing obligations which are not yet
delinquent; (4) purchase money liens or purchase money security interests upon
or in any property acquired or held by Borrower in the ordinary course of
business to secure indebtedness outstanding on the date of this Agreement or
permitted to be incurred under the paragraph of this Agreement titled &#147;Indebtedness
and Liens&#148;; (5) liens and security interests which, as of the date of this
Agreement, have been disclosed to and approved by the Lender in writing; and (6)
those liens and security interests which in the aggregate constitute an
immaterial and insignificant monetary amount with respect to the net value of
Borrower&#146;s assets.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Related Documents.</font></b> &#160;The
words &#147;Related Documents&#148; mean all promissory notes, credit agreements, loan
agreements, environmental agreements, guaranties, security agreements,
mortgages, deeds of trust, security deeds, collateral mortgages, and all other
instruments, agreements end documents, whether now or hereafter existing,
executed in connection with the Loan.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Security Agreement.</font></b> &#160;The
words &#147;Security Agreement&#148; mean and include without limitation any agreements,
promises, covenants, arrangements, understandings or other agreements, whether
created by law, contract, or otherwise, evidencing, governing, representing, or
creating a Security Interest.</p>

<p style="background:white;margin:0in 0in .0001pt .25in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;font-size:10.0pt;margin:0in 0in .0001pt .25in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Security Interest.</font></b> &#160;The
words &#147;Security Interest&#148; mean, without limitation, any and all types of
collateral security, present and future, whether in the form of a lien, charge,
encumbrance, mortgage, deed of trust, security deed, assignment, pledge, crop
pledge, chattel mortgage, collateral chattel mortgage, chattel trust factor&#146;s
lien, equipment trust, conditional sale, trust receipt, lien or title retention
contract, lease or consignment intended as a security device, or any other
security or lien interest whatsoever whether created by law, contract, or
otherwise.</p>

<p style="background:white;margin:0in 0in .0001pt 14.9pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .5pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">BORROWER ACKNOWLEDGES HAVING READ ALL THE PROVISIONS OF THIS BUSINESS
LOAN AGREEMENT AND BORROWER AGREES TO ITS TERMS. THIS BUSINESS LOAN AGREEMENT
IS DATED SEPTMBER&nbsp;16, 2005.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .5pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .5pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">BORROWER:</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .5pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="50%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TOC
  INDUSTRIES, INC.</font></b></p>
  </td>
  <td width="31%" valign="top" style="padding:0in 0in 0in 0in;width:31.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.38%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0in 0in 0in 0in;width:31.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.38%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0in 0in 0in 0in;width:31.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">By:</font></b></p>
  </td>
  <td width="46%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:46.38%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Wayne Whitener</font></p>
  </td>
  <td width="31%" valign="top" style="padding:0in 0in 0in 0in;width:31.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="78%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:78.28%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Wayne
  Whitener, President &amp; CEO of TGC<br>
  Industries,&nbsp;Inc.</font></b></p>
  </td>
  <td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman">&nbsp;</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">LENDER:</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><b><font size="2" face="Times New Roman">&nbsp;</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .7pt;"><b><font size="2" face="Times New Roman">&nbsp;</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SOVEREIGN BANK, N.A.</font></b></p>

<p style="background:white;margin:0in 0in .0001pt .25pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.5%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">By:</font></b></p>
  </td>
  <td width="46%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:46.5%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  Stephanie Baird Velasquez</font></p>
  </td>
  <td width="33%" valign="top" style="padding:0in 0in 0in 0in;width:33.6%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="16%" valign="top" style="padding:0in 0in 0in 0in;width:16.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.5%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="46%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:46.5%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Stephanie
  Baird Velasquez, Senior Vice President</font></b></p>
  </td>
  <td width="33%" valign="top" style="padding:0in 0in 0in 0in;width:33.6%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="16%" valign="top" style="padding:0in 0in 0in 0in;width:16.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="background:white;margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>

<div style="background:white;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<DOCUMENT>
<TYPE>EX-10.3
<SEQUENCE>4
<FILENAME>a05-16471_1ex10d3.htm
<DESCRIPTION>EX-10.3
<TEXT>
<html>

<head>





</head>

<body lang="EN-US">

<div>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit 10.3</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">*LOAN5404*</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PROMISSORY NOTE</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9&#150;2&#150;05</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Date)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">FOR VALUE RECEIVED, <b><font style="font-weight:bold;">TGC Industries, Inc.</font></b>
a corporation located at the address stated below (&#147;<b><font style="font-weight:bold;">Maker</font></b>&#148;)
promises, jointly and severally if more than one, to pay to the order of <b><font style="font-weight:bold;">General Electric Capital Corporation</font></b> or any subsequent holder
hereof (each, a &#147;<b><font style="font-weight:bold;">Payee</font></b>&#148;) at its office located at <b><font style="font-weight:bold;">16479 Dallas Parkway # 300, Addison, TX 75001-2512</font></b> or at such
other place as Payee or the holder hereof may designate, the principal sum of <b><font style="font-weight:bold;">Two Hundred Eighty Six Thousand</font></b>  <b><font style="font-weight:bold;">Two Hundred
Thirty Five Dollars ($286,235.00),</font></b> with interest on the unpaid
principal balance, from the date hereof through and including the dates of
payment, at a fixed per annum simple interest rate of Seven and 25/100 percent
(7.25%).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Subject to the other provisions hereof, the principal on this Note is
payable in lawful money of the United States in Thirty Six (36) consecutive
monthly installments as follows:</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="35%" style="border-collapse:collapse;margin-left:.5in;width:35.0%;">
 <tr>
  <td width="38%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:38.08%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Periodic<br>
  Installment</font></b></p>
  </td>
  <td width="8%" valign="bottom" style="padding:0in 0in 0in 0in;width:8.7%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="48%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:48.62%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Amount</font></b></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.6%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="bottom" style="border:none;padding:0in 0in 0in 0in;width:38.08%;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="8%" valign="bottom" style="padding:0in 0in 0in 0in;width:8.7%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="48%" colspan="2" valign="bottom" style="border:none;padding:0in 0in 0in 0in;width:48.62%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.6%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="38%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:38.08%;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">35</font></p>
  </td>
  <td width="8%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:8.7%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">@</font></p>
  </td>
  <td width="6%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:6.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="42%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:42.18%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">8,870.86</font></p>
  </td>
  <td width="4%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:4.6%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="100" style="border:none;"></td>
  <td width="23" style="border:none;"></td>
  <td width="17" style="border:none;"></td>
  <td width="110" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">each (&#147;Periodic Installment&#148;) and a final installment which shall be in
the amount of the total outstanding unpaid principal.&#160; The first Periodic Installment shall be due
and payable on October 2, 2005 and the following Periodic Installments and the
final installment shall be due and payable on the same day of each succeeding
period (each, a &#147;Payment Date&#148;).&#160; In
addition to the payments of principal provided above, accrued interest shall be
payable on the Payment Date.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">All payments shall be applied first to interest and then to principal.&#160; Each payment may, at the option of the Payee,
be calculated and applied on an assumption that such payment would be made on its
due date.&#160; The acceptance by Payee of any
payment which is less than payment in full of all amounts due and owing as such
time shall not constitute a waiver of Payee&#146;s right to receive payment in full
at such time or at any prior or subsequent time. Interest shall be calculated
on the basis of a 365 day year (366 day leap year).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Maker hereby expressly authorizes the Payee to insert the date
value is actually given in the blank space on the face hereof and on all
related documents pertaining hereto.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This Note may be secured by a security agreement, chattel mortgage,
pledge agreement or like instrument (each of which is hereinafter called a
&#147;Security Agreement&#148;).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Time is of the essence hereof.&#160;
If any installment or any other sum due under this Note or any Security
Agreement is not received within ten (10) days after its due date, the Maker
agrees to pay, in addition to the amount of each such installment or other sum,
a late payment charge of five percent (5%) of the amount of said installment or
other sum, but not exceeding any lawful maximum.&#160; If (i) Maker fails to make payment of any
amount due hereunder within ten (10) days after the same becomes due and
payable; or (ii) Maker is in default under, or fails to perform under any term
or condition contained in any Security Agreement, then the entire principal sum
remaining unpaid, together with all accrued interest thereon and any other sum
payable under this Note or any Security Agreement, at the election of Payee,
shall immediately become due and payable, with interest thereon at the lesser
of eighteen percent (18%) per annum or the highest rate not prohibited by
applicable law from the date of such accelerated maturity until paid (both
before and after any judgment).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Maker may prepay in full, but not in part, its entire indebtedness
hereunder upon payment of the entire indebtedness plus an additional sum as a premium
equal to the following percentages of the original principal balance for the
indicated period:</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Prior to the first annual anniversary date of this Note: Three percent
(3%)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Thereafter and prior to the second annual anniversary date of this
Note: One percent (1%)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Thereafter and prior to the third annual anniversary date of this Note:
One percent (1%)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#160;and zero percent (0%)
thereafter, plus all other sums due hereunder or under any Security Agreement.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">It is the intention of the parties hereto to comply with the applicable
usury laws; accordingly, it is agreed that, notwithstanding any provision to
the contrary in this Note or any Security Agreement, in no event shall this
Note or any Security Agreement require the payment or permit the collection of
interest in excess of the maximum amount permitted by applicable law.&#160; If any such excess interest is contracted
for, charged or received under this Note or any Security Agreement, or if all
of the principal balance shall be prepaid, so that under any of such circumstances
the amount of interest contracted for, charged or received under this Note or
any Security Agreement on the principal balance shall exceed the maximum amount
of interest permitted by applicable law, then in such event (a) the provisions
of this paragraph shall govern and control, (b) neither Maker nor any other person
or entity now or hereafter liable for the payment hereof shall be obligated to
pay the amount of such interest to the extent that it is in excess of the
maximum amount of interest permitted by applicable law, (c) any such excess
which may have been collected shall be either applied as a credit against the then
unpaid principal balance or refunded to Maker, at the option of the Payee, and
(d) the effective rate of interest shall be automatically reduced to the
maximum lawful contract rate allowed under applicable law as now or hereafter
construed by the courts having jurisdiction thereof.&#160; It is further agreed that without limitation
of the foregoing, all calculations of the rate of interest contracted for,
charged or received under this Note or any Security Agreement which are made
for the purpose of determining whether such rate exceeds the maximum lawful
contract rate, shall be made, to the extend permitted by applicable law, by amortizing,
prorating, allocating and spreading in equal parts during the period of the
full stated term of the indebtedness evidenced hereby, all interest at any time
contracted for, charged or received from Maker or otherwise by Payee in
connection with such indebtedness; provided, however, that if any applicable
state law is amended or the law of the United States of America preempts any
applicable state law, so that it becomes lawful for the Payee to receive a
greater interest per annum rate than is presently allowed, the Maker agrees
that, on the effective date of such amendment or preemption, as the case may
be, the lawful maximum hereunder shall be increased to the maximum interest per
annum rate allowed by the amended state law or the law of the United States of
America.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Maker and all sureties, endorsers, guarantors or any others (each
such person, other than the Maker, an &#147;Obligor&#148;) who may at any time become
liable for the payment hereof jointly and severally consent hereby to any and
all extensions of time, renewals, waivers or modifications of, and all
substitutions or releases of, security or of any party primarily or secondarily
liable on this Note or any Security Agreement or any term and provision of
either, which may be made, granted or consented to by Payee, and agree that
suit may be brought and maintained against any one or more of them, at the
election of Payee without joinder of any other as a party thereto, and that
Payee shall not be required first to foreclose, proceed against, or exhaust any
security hereof in order to enforce payment of</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
<!-- SEQ.=1,FOLIO='',FILE='C:\JMS\spalmer\05-15384-2\task583951\15384-2-ki.htm',USER='spalmera',CD='Sep 20 16:11 2005' -->


<br clear="all" style="page-break-before:always;">


<div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">this Note.&#160; The Maker and each
Obligor hereby waives presentment, demand for payment, notice of nonpayment,
protest, notice of protest, notice of dishonor, and all other notices in
connection herewith, as well as filing of suit (if permitted by law) and
diligence in collecting this Note or enforcing any of the security hereof, and
agrees to pay (if permitted by law) all expenses incurred in collection,
including Payee&#146;s actual attorneys&#146; fees.&#160;
Maker and each Obligor agrees that fees not in excess of twenty percent
(20%) of the amount then due shall be deemed reasonable.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">THE MAKER HEREBY UNCONDITIONALLY WAIVES ITS RIGHTS TO A JURY TRIAL OF
ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR
INDIRECTLY, &#160;THIS NOTE, ANY OF THE
RELATED DOCUMENTS, ANY DEALINGS BETWEEN MAKER AND PAYEE RELATING TO THE SUBJECT
MATTER OF THIS TRANSACTION OR ANY RELATED TRANSACTIONS, AND/OR THE RELATIONSHIP
THAT IS BEING ESTABLISHED BETWEEN MAKER AND PAYEE.&#160; THE SCOPE OF THIS WAIVER IS INTENDED TO BE
ALL ENCOMPASSING OF ANY AND ALL DISPUTES THAT MAY BE FILED IN ANY COURT
(INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS, TORT CLAIMS, BREACH OF DUTY
CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY CLAIMS.) THIS WAIVER IS
IRREVOCABLE MEANING THAT IT MAY NOT BE MODIFIED EITHER ORALLY OR IN WRITING,
AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS
OR MODIFICATIONS TO THIS NOTE, ANY RELATED DOCUMENTS, OR TO ANY OTHER DOCUMENTS
OR AGREEMENTS RELATING TO THIS TRANSACTION OR ANY RELATED TRANSACTION.&#160; IN THE EVENT OF LITIGATION, THIS NOTE MAY BE
FILED AS A WRITTEN CONSENT TO A TRIAL BY THE COURT.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This Note and other Debt Documents constitute the entire agreement of
the Maker and Payee with respect to the subject matter hereof and supercedes
all prior understandings, agreements and representations, express or implied.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">No variation or modification of this Note, or any waiver of any of its
provisions or conditions, shall be valid unless in writing and signed by an
authorized representative of Maker and Payee.&#160;
Any such waiver, consent, modification or change shall be effective only
in the specific instance and for the specific purpose given.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Any provision in this Note or any of the other Debt Documents which is
in conflict with any statute, law or applicable rule shall be deemed omitted,
modified or altered to conform thereto.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="39%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:39.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="56%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:56.42%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC Industries, Inc.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="39%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:39.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="56%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:56.42%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="39%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:39.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="56%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:56.42%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ David Swan</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="42%" colspan="6" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:42.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/&nbsp;Wayne Whitener</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Witness)</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" colspan="6" valign="top" style="border:none;padding:0in 0in 0in 0in;width:42.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:42.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">David Swan</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:7.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="39%" colspan="4" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:39.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wayne Whitener</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Print name)</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:7.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" colspan="4" valign="top" style="border:none;padding:0in 0in 0in 0in;width:39.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:7.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:39.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">16479 Dallas Pkwy, Addison, TX</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:5.5%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="41%" colspan="5" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:41.38%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;&nbsp;President </font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address)</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="56%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:56.42%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" colspan="5" valign="top" style="padding:0in 0in 0in 0in;width:14.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Federal Tax ID #:</font></p>
  </td>
  <td width="25%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:25.54%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">742095844</font></p>
  </td>
  <td width="16%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:16.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" valign="top" style="padding:0in 0in 0in 0in;width:36.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="56%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:56.42%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="39%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:39.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:0in 0in 0in 0in;width:4.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="8%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:8.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Address:</font></p>
  </td>
  <td width="48%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:48.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1304 Summit Ave Suite 2, Plano, Collin County, TX 75074</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="25" style="border:none;"></td>
  <td width="270" style="border:none;"></td>
  <td width="31" style="border:none;"></td>
  <td width="35" style="border:none;"></td>
  <td width="7" style="border:none;"></td>
  <td width="16" style="border:none;"></td>
  <td width="3" style="border:none;"></td>
  <td width="46" style="border:none;"></td>
  <td width="191" style="border:none;"></td>
  <td width="53" style="border:none;"></td>
  <td width="71" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

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<DOCUMENT>
<TYPE>EX-10.4
<SEQUENCE>5
<FILENAME>a05-16471_1ex10d4.htm
<DESCRIPTION>EX-10.4
<TEXT>
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<head>





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<div style="font-family:Times New Roman;">

<p align="right" style="margin:0in 0in .0001pt;text-align:right;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit
10.4</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">*MULT1000*</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">AMENDMENT</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">THIS AMENDMENT</font></b>
is<i><font style="font-style:italic;"> </font></i>made as of the 09th day of
September, 2005, between General Electric Capital Corporation, together with
its successors and assigns, if any, and TGC Industries, Inc. in connection with
Schedule&nbsp;Number 003 of that certain <b><font style="font-weight:bold;">Master Security Agreement</font></b>,
dated or dated as of <b><font style="font-weight:bold;">October&nbsp;22, 2004 (&#147;Agreement&#148;)</font></b>.
The terms of this Amendment are hereby incorporated into the Agreement as
though fully set forth therein. The Agreement is hereby amended as follows:</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The 35 Periodic Installment Amount on the Promissory Note is changed
from $8,870.86 to $7,950.97.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TERMS
USED, BUT NOT OTHERWISE DEFINED HEREIN SHALL HAVE THE MEANINGS GIVEN TO THEM IN
THE AGREEMENT. EXCEPT AS EXPRESSLY AMENDED HEREBY, THE AGREEMENT SHALL REMAIN
IN FULL FORCE AND EFFECT.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">IN WITNESS WHEREOF</font></b>, the<i><font style="font-style:italic;"> </font></i>parties hereto have
executed this Amendment by signature of their respective authorized
representative set forth below.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="39%" colspan="5" valign="top" style="padding:0in 0in 0in 0in;width:39.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SECURED PARTY:</font></b></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:49.08%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">DEBTOR:</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="39%" colspan="5" valign="top" style="padding:0in 0in 0in 0in;width:39.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">General Electric Capital Corporation</font></b></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:49.08%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC Industries, Inc.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="39%" colspan="5" valign="top" style="padding:0in 0in 0in 0in;width:39.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:49.08%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="3%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:3.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="35%" colspan="3" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:35.88%;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-autospace:none;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ W. Scott
  Cummins</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="34%" colspan="3" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:34.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/&nbsp;Wayne Whitener</font></p>
  </td>
  <td width="11%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:11.08%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:3.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="35%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:35.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:5.92%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:32.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:6.0%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="33%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:33.46%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-autospace:none;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;W. Scott Cummins</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:5.92%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="32%" colspan="2" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:32.58%;">
  <p style="margin:0in 0in .0001pt 20.0pt;text-autospace:none;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wayne Whitener</font></p>
  </td>
  <td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="36%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:36.12%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:49.08%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="4%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:4.76%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="34%" colspan="2" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:34.7%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-autospace:none;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Risk Analyst</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.46%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:4.9%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="33%" colspan="3" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:33.6%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;&nbsp;President </font></p>
  </td>
  <td width="10%" valign="top" style="padding:0in 0in 0in 0in;width:10.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="25" style="border:none;"></td>
  <td width="2" style="border:none;"></td>
  <td width="9" style="border:none;"></td>
  <td width="9" style="border:none;"></td>
  <td width="250" style="border:none;"></td>
  <td width="86" style="border:none;"></td>
  <td width="27" style="border:none;"></td>
  <td width="9" style="border:none;"></td>
  <td width="8" style="border:none;"></td>
  <td width="240" style="border:none;"></td>
  <td width="4" style="border:none;"></td>
  <td width="79" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

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<DOCUMENT>
<TYPE>EX-10.5
<SEQUENCE>6
<FILENAME>a05-16471_1ex10d5.htm
<DESCRIPTION>EX-10.5
<TEXT>
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<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit 10.5</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman"><img width="159" height="38" src="g153842kki001.jpg"></font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PROMISSORY NOTE</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9&#150;12&#150;05</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Date)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:6.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">FOR VALUE RECEIVED, <b><font style="font-weight:bold;">TGC Industries, Inc.</font></b>
a corporation located at the address stated below (&#147;<b><font style="font-weight:bold;">Maker</font></b>&#148;)
promises, jointly and severally if more than one, to pay to the order of <b><font style="font-weight:bold;">General Electric Capital Corporation</font></b> or any subsequent holder
hereof (each, a &#147;<b><font style="font-weight:bold;">Payee</font></b>&#148;) at its office located at <b><font style="font-weight:bold;">16479 Dallas Parkway #300, Addison, TX 75001-2512</font></b> or at such
other place as Payee or the holder hereof may designate, the principal sum of <b><font style="font-weight:bold;">Two hundred eighty six thousand two hundred thirty five and 00/100
Dollars ($286,235.00),</font></b> with interest on the unpaid principal
balance, from the date hereof through and including the dates of payment, at a
fixed per annum simple interest rate of Seven and 25/100 percent (7.25%).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Subject to the other provisions hereof, the principal on this Note is
payable in lawful money of the United States in Thirty six (36) consecutive
monthly installments as follows:</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="35%" style="border-collapse:collapse;margin-left:.5in;width:35.0%;">
 <tr>
  <td width="41%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:41.26%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Periodic<br>
  Installment</font></b></p>
  </td>
  <td width="10%" valign="bottom" style="padding:0in 0in 0in 0in;width:10.88%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="41%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:41.88%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Amount</font></b></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.98%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="41%" valign="bottom" style="border:none;padding:0in 0in 0in 0in;width:41.26%;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="10%" valign="bottom" style="padding:0in 0in 0in 0in;width:10.88%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="41%" colspan="2" valign="bottom" style="border:none;padding:0in 0in 0in 0in;width:41.88%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.98%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="41%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:41.26%;">
  <p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">35</font></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:10.88%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">@</font></p>
  </td>
  <td width="4%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:4.7%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="37%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:37.16%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">8,906.59</font></p>
  </td>
  <td width="5%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in 0in 0in 0in;width:5.98%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="108" style="border:none;"></td>
  <td width="28" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="97" style="border:none;"></td>
  <td width="16" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">each (&#147;Periodic Installment&#148;) and a final installment which shall be in
the amount of the total outstanding unpaid principal.&#160; The first Periodic Installment shall be due
and payable on November 2, 2005 and the following Periodic Installments and the
final installment shall be due and payable on the same day of each succeeding
period (each, a &#147;Payment Date&#148;).&#160; In
addition to the payments of principal provided above, accrued interest shall be
payable on the Payment Date.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:8.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">All payments shall be applied first to interest and then to principal.&#160; Each payment may, at the option of the Payee,
be calculated and applied on an assumption that such payment would be made on its
due date.&#160; The acceptance by Payee of any
payment which is less than payment in full of all amounts due and owing at such
time shall not constitute a waiver of Payee&#146;s right to receive payment in full
at such time or at any prior or subsequent time. Interest shall be calculated
on the basis of a 365 day year (366 day leap year).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Maker hereby expressly authorizes the Payee to insert the date
value is actually given in the blank space on the face hereof and on all
related documents pertaining hereto.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This Note may be secured by a security agreement, chattel mortgage,
pledge agreement or like instrument (each of which is hereinafter called a
&#147;Security Agreement&#148;).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Time is of the essence hereto.&#160;
If any installment or any other sum due under this Note or any Security
Agreement is not received within ten (10) days after its due date, the Maker
agrees to pay, in addition to the amount of each such installment or other sum,
a late payment charge of five percent (5%) of the amount of said installment or
other sum, but not exceeding any lawful maximum.&#160; If (i) Maker fails to make payment of any
amount due hereunder within ten (10) days after the same becomes due and
payable; or (ii) Maker is in default under, or fails to perform under any term
or condition contained in any Security Agreement, then the entire principal sum
remaining unpaid, together with all accrued interest thereon and any other sum
payable under this Note or any Security Agreement, at the election of Payee,
shall immediately become due and payable, with interest thereon at the lesser
of eighteen percent (18%) per annum or the highest rate not prohibited by
applicable law from the date of such accelerated maturity until paid (both
before and after any judgment).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Maker may prepay in full, but not in part, its entire indebtedness
hereunder upon payment of the entire indebtedness plus an additional sum as a premium
equal to the following percentages of the original principal balance for the
indicated period:</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Prior to the first annual anniversary date of this Note: Three percent
(3%)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Thereafter and prior to the second annual anniversary date of this
Note: One percent (1%)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Thereafter and prior to the third annual anniversary date of this Note:
One percent (1%)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#160;and zero percent (0%)
thereafter, plus all other sums due hereunder or under any Security Agreement.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">It is the intention of the parties herein to comply with the applicable
usury laws; accordingly, it is agreed that, notwithstanding any provision to
the contrary in this Note or any Security Agreement, in no event shall this
Note or any Security Agreement require the payment or permit the collection of
interest in excess of the maximum amount permitted by applicable law.&#160; If any such excess interest is contracted
for, charged or received under this Note or any Security Agreement, or if all
of the principal balance shall be prepaid, so that under any of such circumstances
the amount of interest contracted for, charged or received under this Note or
any Security Agreement on the principal balance shall exceed the maximum amount
of interest permitted by applicable law, then in such event (a) the provisions
of this paragraph shall govern and control, (b) neither Maker nor any other person
or entity now or hereafter liable for the payment hereof shall be obligated to
pay the amount of such interest to the extent that it is in excess of the
maximum amount of interest permitted by applicable law, (c) any such excess
which may have been collected shall be either applied as a credit against the then
unpaid principal balance or refunded to Maker, at the option of the Payee, and
(d) the effective rate of interest shall be automatically reduced to the
maximum lawful contract rate allowed under applicable law as now or hereafter
construed by the courts having jurisdiction thereof.&#160; It is further agreed that without limitation
of the foregoing, all calculations of the rate of interest contracted for,
charged or received under this Note or any Security Agreement which are made
for the purpose of determining whether such rate exceeds the maximum lawful
contract rate, shall be made, to the extent permitted by applicable law, by amortizing,
prorating, allocating and spreading in equal parts during the period of the
full stated term of the indebtedness evidenced hereby, all interest of any time
contracted for, charged or received from Maker or otherwise by Payee in
connection with such indebtedness; provided, however, that if any applicable
state law is amended or the law of the United States of America preempts any
applicable state law, so that it becomes lawful for the Payee to receive a
greater interest per annum rate than is presently allowed, the Maker agrees
that, on the effective date of such amendment or preemption, as the case may
be, the lawful maximum hereunder shall be increased to the maximum interest per
annum rate allowed by the amended state law or the law of the United States of
America.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Maker and all sureties, endorsers, guarantors or any others (each
such person, other than the Maker, an &#147;<b><font style="font-weight:bold;">Obligor</font></b>&#148;) who
may at any time become liable for the payment hereof jointly and severally
consent hereby to any and all extensions of time, renewals, waivers or
modifications of, and all substitutions or releases of, security or of any
party primarily or secondarily liable on this Note or any Security Agreement or
any term and provision of either, which may be made, granted or consented to by
Payee, and agree that suit may be brought and maintained against any one or
more of them, at the election of Payee without joinder of any other as a party
thereto, and that Payee shall not be required first in foreclose, proceed
against, or exhaust any security hereof in order to enforce payment of</font></p>

<p style="margin:0in 0in .0001pt;"><font size="1" face="Times New Roman" style="font-size:5.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
<!-- SEQ.=1,FOLIO='',FILE='C:\JMS\eudelhofen\05-15384-2\task583950\15384-2-kk.htm',USER='eudelho',CD='Sep 20 16:04 2005' -->


<br clear="all" style="page-break-before:always;">


<div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">this Note.&#160; The Maker and each
Obligor hereby waives presentment, demand for payment, notice of nonpayment,
protest, notice of protest, notice of dishonor, and all other notices in
connection herewith, as well as filing of suit (if permitted by law) and
diligence in collecting this Note or enforcing any of the security hereof, and
agrees to pay (if permitted by law) all expenses incurred in collection,
including Payee&#146;s actual attorneys&#146; fees.&#160;
Maker and each Obligor agrees that fees not in excess of twenty percent
(20%) of the amount then due shall be deemed reasonable.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">THE MAKER HEREBY UNCONDITIONALLY WAIVES ITS RIGHTS TO A JURY TRIAL OF
ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR
INDIRECTLY. THIS NOTE, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS BETWEEN MAKER
AND PAYEE RELATING TO THE SUBJECT MATTER OF THIS TRANSACTION OR ANY RELATED
TRANSACTIONS, AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN MAKER
AND PAYEE.&#160; THE SCOPE OF THIS WAIVER IS
INTENDED TO BE ALL ENCOMPASSING OF ANY AND ALL DISPUTES THAT MAY BE FILED IN
ANY COURT (INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS, TORT CLAIMS, BREACH
OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY CLAIMS.) THIS WAIVER IS
IRREVOCABLE MEANING THAT IT MAY NOT BE MODIFIED EITHER ORALLY OR IN WRITING,
AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS
OR MODIFICATIONS TO THIS NOTE, ANY RELATED DOCUMENTS, OR TO ANY OTHER DOCUMENTS
OR AGREEMENTS RELATING TO THIS TRANSACTION OR ANY RELATED TRANSACTION.&#160; IN THE EVENT OF LITIGATION, THIS NOTE MAY BE
FILED AS A WRITTEN CONSENT TO A TRIAL BY THE COURT.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This Note and other Debt Documents constitute the entire agreement of
the Maker and Payee with respect to the subject matter hereof and supercedes
all prior understandings, agreements and representations, express or implied.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">No variation or modification of this Note, or any waiver of any of its
provisions or conditions, shall be valid unless in writing and signed by an
authorized representative of Maker and Payee.&#160;
Any such waiver, consent, modification or change shall be effective only
in the specific instance and for the specific purpose given.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Any provision in this Note or any of the other Debt Documents which is
in conflict with any statute, law or applicable rule shall be deemed omitted,
modified or altered to conform thereto.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="36%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:36.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="60%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:60.82%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC Industries, Inc.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="36%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:36.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="60%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:60.82%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ David Swan</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="47%" colspan="6" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:47.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/&nbsp;Wayne Whitener</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Witness)</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="47%" colspan="6" valign="top" style="border:none;padding:0in 0in 0in 0in;width:47.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.58%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="47%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:47.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">David Swan</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:6.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="44%" colspan="4" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:44.88%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wayne Whitener</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Print name)</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:6.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" colspan="4" valign="top" style="border:none;padding:0in 0in 0in 0in;width:44.88%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:6.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:44.88%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">16479 Dallas Pkwy, Addison, TX</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:5.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="45%" colspan="5" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:45.72%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;&nbsp;President </font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address)</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="60%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:60.82%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" colspan="5" valign="top" style="padding:0in 0in 0in 0in;width:14.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Federal Tax ID #:</font></p>
  </td>
  <td width="29%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:29.1%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">742095844</font></p>
  </td>
  <td width="17%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:17.4%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="32%" valign="top" style="padding:0in 0in 0in 0in;width:32.68%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="60%" colspan="8" valign="top" style="padding:0in 0in 0in 0in;width:60.82%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="36%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:36.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.18%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:7.9%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Address:</font></p>
  </td>
  <td width="52%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:52.92%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1304 SUMMIT AVE SUITE 2, PLANO, COLLIN County, TX 75074</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="25" style="border:none;"></td>
  <td width="244" style="border:none;"></td>
  <td width="24" style="border:none;"></td>
  <td width="27" style="border:none;"></td>
  <td width="12" style="border:none;"></td>
  <td width="6" style="border:none;"></td>
  <td width="14" style="border:none;"></td>
  <td width="48" style="border:none;"></td>
  <td width="218" style="border:none;"></td>
  <td width="56" style="border:none;"></td>
  <td width="74" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

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</font></div>

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<DOCUMENT>
<TYPE>EX-10.6
<SEQUENCE>7
<FILENAME>a05-16471_1ex10d6.htm
<DESCRIPTION>EX-10.6
<TEXT>
<html>

<head>





</head>

<body lang="EN-US" style="text-justify-trim:punctuation;">

<div style="font-family:Times New Roman;">

<p align="right" style="margin:0in 0in .0001pt;text-align:right;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit
10.6</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">*MULT1000*</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">AMENDMENT</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">THIS AMENDMENT</font></b>
is<i><font style="font-style:italic;"> </font></i>made as of the 09th day of
September, 2005, between <b><font style="font-weight:bold;">General Electric Capital
Corporation, </font></b>together with its successors and assigns, if any, and <b><font style="font-weight:bold;">TGC Industries, Inc.</font></b> in connection with Schedule&nbsp;Number
004 of that certain <b><font style="font-weight:bold;">Master Security Agreement,</font></b>
dated or dated as of<b><font style="font-weight:bold;"> October&nbsp;22, 2004 (&#147;Agreement&#148;).</font></b>
The terms of this Amendment are hereby incorporated into the Agreement as
though fully set forth therein. The Agreement is hereby amended as follows:</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The 35 Periodic Installment Amount on the Promissory Note is changed
from $8,906.59 to $7,950.97.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TERMS
USED, BUT NOT OTHERWISE DEFINED HEREIN SHALL HAVE THE MEANINGS GIVEN TO THEM IN
THE AGREEMENT. EXCEPT AS EXPRESSLY AMENDED HEREBY, THE AGREEMENT SHALL REMAIN
IN FULL FORCE AND EFFECT.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">IN WITNESS WHEREOF,</font></b> the<i><font style="font-style:italic;"> </font></i>parties hereto have
executed this Amendment by signature of their respective authorized
representative set forth below.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="38%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:38.74%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SECURED PARTY:</font></b></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="7" valign="top" style="padding:0in 0in 0in 0in;width:49.62%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">DEBTOR:</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="38%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:38.74%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">General Electric Capital Corporation</font></b></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="7" valign="top" style="padding:0in 0in 0in 0in;width:49.62%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC Industries, Inc.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="38%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:38.74%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="7" valign="top" style="padding:0in 0in 0in 0in;width:49.62%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.92%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="5%" colspan="4" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:5.44%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="30%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:30.36%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ W. Scott Cummins</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:4.38%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="3%" colspan="3" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:3.74%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:31.82%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/&nbsp;Wayne Whitener</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.68%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.92%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="35%" colspan="5" valign="top" style="padding:0in 0in 0in 0in;width:35.8%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:39.94%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.68%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="5%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:5.04%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="3%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="30%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:30.36%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">W. Scott Cummins</font></p>
  </td>
  <td width="11%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:11.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:5.98%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="1%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:1.92%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:31.82%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wayne Whitener</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.68%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:3.42%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="35%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:35.3%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="7" valign="top" style="padding:0in 0in 0in 0in;width:49.62%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="4%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:4.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="3%" colspan="2" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:3.7%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="30%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:30.36%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Risk Analyst</font></p>
  </td>
  <td width="11%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:11.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:4.96%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="2%" colspan="2" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:2.94%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:31.82%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">President</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.68%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="22" style="border:none;"></td>
  <td width="4" style="border:none;"></td>
  <td width="9" style="border:none;"></td>
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  <td width="227" style="border:none;"></td>
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  <td width="238" style="border:none;"></td>
  <td width="72" style="border:none;"></td>
 </tr>
</table>

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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.7
<SEQUENCE>8
<FILENAME>a05-16471_1ex10d7.htm
<DESCRIPTION>EX-10.7
<TEXT>
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<head>





</head>

<body lang="EN-US" style="text-justify-trim:punctuation;">

<div style="font-family:Times New Roman;">

<p align="right" style="margin:0in 0in .0001pt;text-align:right;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Exhibit
10.7</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">*MULT1000*</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">AMENDMENT</font></b></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">THIS AMENDMENT</font></b>
is<i><font style="font-style:italic;"> </font></i>made as of the twelfth day of
September, 2005, between <b><font style="font-weight:bold;">General Electric Capital
Corporation,</font></b> together with its successors and assigns, if any, and <b><font style="font-weight:bold;">TGC Industries, Inc.</font></b> in connection with Schedule&nbsp;Number
004 of that certain <b><font style="font-weight:bold;">Master Security Agreement,</font></b>
dated or dated as of <b><font style="font-weight:bold;">October&nbsp;22, 2004 (&#147;Agreement&#148;).</font></b>
The terms of this Amendment are hereby incorporated into the Agreement as
though fully set forth therein. The Agreement is hereby amended as follows:</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The first Periodic Installment on the Promissory Note is changed from November
2, 2005 to October 12, 2005.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">TERMS
USED, BUT NOT OTHERWISE DEFINED HEREIN SHALL HAVE THE MEANINGS GIVEN TO THEM IN
THE AGREEMENT. EXCEPT AS EXPRESSLY AMENDED HEREBY, THE AGREEMENT SHALL REMAIN
IN FULL FORCE AND EFFECT.</font></p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">IN WITNESS WHEREOF</font></b>, the<i><font style="font-style:italic;"> </font></i>parties hereto have
executed this Amendment by signature of their respective authorized
representative set forth below.</p>

<p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="38%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:38.76%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SECURED PARTY:</font></b></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="7" valign="top" style="padding:0in 0in 0in 0in;width:49.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">DEBTOR:</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="38%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:38.76%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">General Electric Capital Corporation</font></b></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="7" valign="top" style="padding:0in 0in 0in 0in;width:49.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TGC Industries, Inc.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="38%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:38.76%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="7" valign="top" style="padding:0in 0in 0in 0in;width:49.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.92%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="5%" colspan="4" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:5.44%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="30%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:30.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ W. Scott Cummins</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:4.38%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="3%" colspan="3" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:3.74%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:31.82%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/&nbsp;Wayne Whitener</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.64%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.92%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="35%" colspan="5" valign="top" style="padding:0in 0in 0in 0in;width:35.84%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="39%" colspan="6" valign="top" style="padding:0in 0in 0in 0in;width:39.94%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.64%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="5%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:5.04%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="3%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:3.32%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="30%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:30.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">W. Scott Cummins</font></p>
  </td>
  <td width="11%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:11.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:5.98%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="1%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:1.92%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:31.82%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wayne Whitener</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.64%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:3.42%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="35%" colspan="4" valign="top" style="padding:0in 0in 0in 0in;width:35.34%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="7" valign="top" style="padding:0in 0in 0in 0in;width:49.58%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="4%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:4.66%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="3%" colspan="2" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:3.7%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="30%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:30.4%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Risk Analyst</font></p>
  </td>
  <td width="11%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:11.88%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:4.96%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="2%" colspan="2" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:2.94%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="31%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:31.82%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">President</font></p>
  </td>
  <td width="9%" valign="top" style="padding:0in 0in 0in 0in;width:9.64%;">
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="22" style="border:none;"></td>
  <td width="4" style="border:none;"></td>
  <td width="9" style="border:none;"></td>
  <td width="3" style="border:none;"></td>
  <td width="25" style="border:none;"></td>
  <td width="227" style="border:none;"></td>
  <td width="87" style="border:none;"></td>
  <td width="2" style="border:none;"></td>
  <td width="31" style="border:none;"></td>
  <td width="6" style="border:none;"></td>
  <td width="8" style="border:none;"></td>
  <td width="14" style="border:none;"></td>
  <td width="238" style="border:none;"></td>
  <td width="72" style="border:none;"></td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g153842kki001.jpg
<DESCRIPTION>GRAPHIC
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`
end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
