<SEC-DOCUMENT>0001193125-12-103981.txt : 20120308
<SEC-HEADER>0001193125-12-103981.hdr.sgml : 20120308
<ACCEPTANCE-DATETIME>20120308164554
ACCESSION NUMBER:		0001193125-12-103981
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		8
CONFORMED PERIOD OF REPORT:	20120306
ITEM INFORMATION:		Entry into a Material Definitive Agreement
ITEM INFORMATION:		Regulation FD Disclosure
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20120308
DATE AS OF CHANGE:		20120308

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PLAINS ALL AMERICAN PIPELINE LP
		CENTRAL INDEX KEY:			0001070423
		STANDARD INDUSTRIAL CLASSIFICATION:	PIPE LINES (NO NATURAL GAS) [4610]
		IRS NUMBER:				760582150
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14569
		FILM NUMBER:		12677798

	BUSINESS ADDRESS:	
		STREET 1:		333 CLAY STREET
		STREET 2:		SUITE 1600
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
		BUSINESS PHONE:		7136544100

	MAIL ADDRESS:	
		STREET 1:		333 CLAY STREET
		STREET 2:		SUITE 1600
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77002
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>d313008d8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
<HTML><HEAD>
<TITLE>Form 8-K</TITLE>
</HEAD>
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 <P STYLE="line-height:0px;margin-top:0px;margin-bottom:0px;border-bottom:0.5pt solid #000000">&nbsp;</P>
<P STYLE="line-height:3px;margin-top:0px;margin-bottom:2px;border-bottom:0.5pt solid #000000">&nbsp;</P> <P STYLE="margin-top:4px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="5"><B>UNITED STATES </B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="5"><B>SECURITIES AND EXCHANGE COMMISSION </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="3"><B>Washington, D.C. 20549 </B></FONT></P> <P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P><center>
<P STYLE="line-height:6px;margin-top:0px;margin-bottom:2px;border-bottom:1pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:6px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="5"><B>FORM 8-K
</B></FONT></P> <P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P><center> <P STYLE="line-height:6px;margin-top:0px;margin-bottom:2px;border-bottom:1pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:6px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="4"><B>CURRENT REPORT </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="3"><B>Pursuant to Section&nbsp;13 or 15(d) </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="3"><B>of the Securities Exchange Act of
1934 </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="3"><B>Date of report (Date of earliest event reported): March&nbsp;6, 2012 </B></FONT></P>
<P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P><center> <P STYLE="line-height:6px;margin-top:0px;margin-bottom:2px;border-bottom:1pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:6px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="6"><B>Plains All American Pipeline, L.P. </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2"><B>(Exact name of registrant as specified in its charter) </B></FONT></P> <P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P><center>
<P STYLE="line-height:6px;margin-top:0px;margin-bottom:2px;border-bottom:1pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD VALIGN="top" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Delaware</B></FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>1-14569</B></FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>76-0582150</B></FONT></TD></TR>
<TR>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="1"><B>(State or other jurisdiction</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="1"><B>of incorporation)</B></FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="1"><B>(Commission</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="1"><B>File Number)</B></FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="1"><B>(IRS Employer</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="1"><B>Identification No.)</B></FONT></P></TD></TR>
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<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
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<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>333 Clay Street, Suite&nbsp;1600</B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:1px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Houston, Texas</B></FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>77002</B></FONT></TD></TR>
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<TD VALIGN="top" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="1"><B>(Address of principal executive offices)</B></FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="1"><B>(Zip Code)</B></FONT></TD></TR>
</TABLE> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Registrant&#146;s telephone number, including area code: (713)&nbsp;646-4100 </B></FONT></P>
<P STYLE="margin-top:6px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Not applicable </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="1"><B>(Former name or former address, if changed since last report) </B></FONT></P> <P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P><center>
<P STYLE="line-height:6px;margin-top:0px;margin-bottom:2px;border-bottom:1pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">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 (see General Instruction A.2. below): </FONT></P>
<P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Written communications pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425) </FONT></TD></TR></TABLE>
<P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12) </FONT></TD></TR></TABLE>
<P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Pre-commencement communications pursuant to Rule&nbsp;14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) </FONT></TD></TR></TABLE>
<P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Pre-commencement communications pursuant to Rule&nbsp;13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) </FONT></TD></TR></TABLE>
<P STYLE="font-size:8px;margin-top:0px;margin-bottom:0px">&nbsp;</P> <P STYLE="line-height:0px;margin-top:0px;margin-bottom:0px;border-bottom:0.5pt solid #000000">&nbsp;</P>
<P STYLE="line-height:3px;margin-top:0px;margin-bottom:2px;border-bottom:0.5pt solid #000000">&nbsp;</P>

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<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

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<TD WIDTH="9%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>ITEM&nbsp;1.01</B></FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Entry Into a Material Definitive Agreement. </B></FONT></TD></TR></TABLE> <P STYLE="margin-top:6px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">On March&nbsp;6, 2012, Plains All American Pipeline, L.P. (the &#147;Partnership&#148;) entered into an Underwriting Agreement (the &#147;Underwriting Agreement&#148;) with Barclays Capital Inc., Merrill
Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated, Citigroup Global Markets Inc., J.P. Morgan Securities LLC, UBS Securities LLC and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein (the
&#147;Underwriters&#148;), that provides for the issuance and sale by the Partnership, and purchase by the Underwriters, of 5,750,000 common units representing limited partner interests in the Partnership (the &#147;Common Units&#148;), which amount
includes 750,000 common units purchased pursuant to the full exercise of the Underwriters&#146; over-allotment option. The material terms of the offering of the Common Units are described in the prospectus supplement, dated March&nbsp;6, 2012, as
filed by the Partnership with the Securities and Exchange Commission (the &#147;Commission&#148;). The offer and sale of the Common Units was registered with the Commission pursuant to an automatic shelf registration statement on Form S-3
(Registration No.&nbsp;333-162475) filed by the Partnership on October&nbsp;14, 2009. Closing with respect to the Common Units is expected to occur on March&nbsp;9, 2012, subject to the satisfaction of customary closing conditions. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The Underwriting Agreement contains customary representations, warranties and agreements of the Partnership and certain affiliates, and
customary conditions to closing, indemnification rights, obligations of the parties and termination provisions. Furthermore, the Partnership, its general partner, certain officers and directors and its general partner and certain of their affiliates
have agreed with the Underwriters not to offer or sell any common units (or securities convertible into or exchangeable for common units), subject to customary exceptions, for a period of 45&nbsp;days after the date of the Underwriting Agreement
without the prior written consent of Barclays Capital Inc. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">Each of the Underwriters or their respective affiliates have
performed investment and commercial banking and advisory services for the Partnership and its affiliates from time to time for which they have received customary fees and expenses. The Underwriters and their affiliates may, from time to time, engage
in transactions with and perform services for the Partnership in the ordinary course of their business. Affiliates of certain of the Underwriters are lenders under the Partnership&#146;s credit facilities and accordingly may receive a portion of the
proceeds from the offering pursuant to any repayment of borrowings under such facilities. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The foregoing description of the
Underwriting Agreement is qualified in its entirety by reference to such Underwriting Agreement, a copy of which is filed herewith as Exhibit&nbsp;1.1 and is incorporated herein by reference. Legal opinions relating to the offering of the Common
Units are attached hereto as Exhibits 5.1 and 8.1. </FONT></P> <P STYLE="font-size:18px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="9%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>ITEM&nbsp;7.01.</B></FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Regulation&nbsp;FD Disclosure. </B></FONT></TD></TR></TABLE> <P STYLE="margin-top:6px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">On March&nbsp;6, 2012, the Partnership issued a press release announcing that it had priced the offering described in Item&nbsp;1.01 of this Current Report on Form 8-K. A copy of the press release is
furnished as Exhibit&nbsp;99.1 hereto. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">In accordance with General Instruction B.2 of Form 8-K, the disclosure in this
Item&nbsp;7.01 and Exhibit&nbsp;99.1 is deemed to be &#147;furnished&#148; and shall not be deemed &#147;filed&#148; for the purpose of Section&nbsp;18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of
that section, nor shall such information and Exhibit&nbsp;99.1 be deemed incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, each as amended. </FONT></P>
<P STYLE="font-size:18px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="9%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>ITEM&nbsp;9.01</B></FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Financial Statements and Exhibits. </B></FONT></TD></TR></TABLE>
<P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">(d)&nbsp;Exhibits. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="92%"></TD></TR>
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<TD VALIGN="bottom" NOWRAP> <P STYLE="border-bottom:1px solid #000000;width:26pt"><FONT STYLE="font-family:Times New Roman" SIZE="1">Exhibit<BR>Number</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="border-bottom:1px solid #000000;width:37pt"><FONT STYLE="font-family:Times New Roman" SIZE="1">Description</FONT></P></TD></TR>


<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP><FONT STYLE="font-family:Times New Roman" SIZE="2">1.1</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Underwriting Agreement, dated March 6, 2012, by and among Plains All American Pipeline, L.P. and Barclays Capital Inc., Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated,
Citigroup Global Markets Inc., J.P. Morgan Securities LLC, UBS Securities LLC and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein.</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP><FONT STYLE="font-family:Times New Roman" SIZE="2">5.1</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Opinion of Vinson &amp; Elkins L.L.P.</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP><FONT STYLE="font-family:Times New Roman" SIZE="2">8.1</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Opinion of Vinson &amp; Elkins L.L.P. as to certain tax matters.</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP><FONT STYLE="font-family:Times New Roman" SIZE="2">99.1</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Press Release dated March&nbsp;6, 2012.</FONT></TD></TR>
</TABLE>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">2 </FONT></P>


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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>SIGNATURES </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">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 STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P><DIV ALIGN="right">
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<TD VALIGN="bottom" COLSPAN="5" NOWRAP><FONT STYLE="font-family:Times New Roman" SIZE="2">PLAINS ALL AMERICAN PIPELINE, L.P.</FONT></TD></TR>


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<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="4"></TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">PAA GP LLC, its general partner</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="4"></TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">PLAINS AAP, L.P., its sole member</FONT></TD></TR>
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<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="4"></TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">PLAINS ALL AMERICAN GP LLC,<BR>its general partner</FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="4"></TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" COLSPAN="3" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ Tim Moore</FONT></TD></TR>
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<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Tim Moore</FONT></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Vice President</FONT></TD></TR>
</TABLE></DIV> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Date: March&nbsp;8, 2012 </FONT></P>

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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>EXHIBIT INDEX </B></FONT></P>
<P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="92%"></TD></TR>
<TR>
<TD VALIGN="bottom" NOWRAP> <P STYLE="border-bottom:1px solid #000000;width:26pt"><FONT STYLE="font-family:Times New Roman" SIZE="1">Exhibit<BR>Number</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="border-bottom:1px solid #000000;width:37pt"><FONT STYLE="font-family:Times New Roman" SIZE="1">Description</FONT></P></TD></TR>


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<TD HEIGHT="8" COLSPAN="2"></TD></TR>
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<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">1.1</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Underwriting Agreement, dated March 6, 2012, by and among Plains All American Pipeline, L.P. and Barclays Capital Inc., Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated,
Citigroup Global Markets Inc., J.P. Morgan Securities LLC, UBS Securities LLC and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein.</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP><FONT STYLE="font-family:Times New Roman" SIZE="2">5.1</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Opinion of Vinson &amp; Elkins L.L.P.</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP><FONT STYLE="font-family:Times New Roman" SIZE="2">8.1</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Opinion of Vinson &amp; Elkins L.L.P. as to certain tax matters.</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP><FONT STYLE="font-family:Times New Roman" SIZE="2">99.1</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Press Release dated March&nbsp;6, 2012.</FONT></TD></TR>
</TABLE>
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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1.1
<SEQUENCE>2
<FILENAME>d313008dex11.htm
<DESCRIPTION>UNDERWRITING AGREEMENT
<TEXT>
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<TITLE>Underwriting Agreement</TITLE>
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Exhibit 1.1 </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="right"><FONT
STYLE="font-family:Times New Roman" SIZE="2"><B><I>Execution Version </I></B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>PLAINS ALL AMERICAN PIPELINE, L.P.
</B></FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>5,000,000 Common Units </B></FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2"><B>Representing Limited Partner Interests </B></FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>UNDERWRITING AGREEMENT
</B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">New York, New York </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT
STYLE="font-family:Times New Roman" SIZE="2">March&nbsp;6, 2012 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Barclays Capital Inc. </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Citigroup Global Markets Inc. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">J.P. Morgan Securities LLC </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">UBS Securities LLC </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Wells Fargo Securities, LLC
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">c/o Barclays Capital Inc. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">745
Seventh Avenue </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">New York, New York 10019 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">As Representatives of the several underwriters </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Ladies and Gentlemen: </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains All American Pipeline, L.P., a Delaware limited partnership (the &#147;<B>Partnership</B>&#148;), proposes to issue and sell an
aggregate of 5,000,000 common units (the &#147;<B>Firm Units</B>&#148;) representing limited partner interests in the Partnership (&#147;<B>Common Units</B>&#148;) to the several underwriters named in <U>Schedule&nbsp;I</U> hereto (the
&#147;<B>Underwriters</B>&#148;), for whom Barclays Capital Inc., Citigroup Global Markets Inc., J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated UBS Securities LLC and Wells Fargo Securities, LLC are acting as
the representatives (the &#147;<B>Representatives</B>&#148;), upon the terms and conditions set forth in Section&nbsp;2 hereof. The Partnership also proposes to grant to the Underwriters, upon the terms and conditions set forth in Section&nbsp;2
hereof, an option to purchase up to an additional 750,000 Common Units (the &#147;<B>Option Units</B>&#148;). The Firm Units and the Option Units, if purchased, are hereinafter collectively called the &#147;<B>Units</B>.&#148; </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">PAA GP LLC, a Delaware limited liability company (the &#147;<B>General Partner</B>&#148;), is the general partner of the Partnership.
Plains AAP, L.P., a Delaware limited partnership (&#147;<B>Plains AAP</B>&#148;), owns a 100% membership interest in the General Partner. Plains All American GP LLC, a Delaware limited liability company (&#147;<B>GP LLC</B>&#148; and, collectively
with the General Partner and Plains AAP, the &#147;<B>GP Entities</B>&#148;), is the general partner of Plains AAP. </FONT></P>

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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The subsidiaries of the Partnership listed on <U>Schedule III</U> attached hereto are
referred to herein as the &#147;<B>Material Subsidiaries</B>,&#148; and the Material Subsidiaries listed on <U>Schedule IV</U> attached hereto are referred to herein as the &#147;<B>Domestic Subsidiaries</B>.&#148; </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">This is to confirm the agreement among the Partnership and the Underwriters concerning the several purchases of the Units by the
Underwriters. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">1. <U>Representations and Warranties of the Partnership</U>. The Partnership represents and warrants to the
Underwriters that: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(a) <I>Registration.</I> A registration statement on Form S-3 relating to the Units (File
No.&nbsp;333-162475) (i)&nbsp;has been prepared by the Partnership in conformity with the requirements of the Securities Act of 1933, as amended (the &#147;<B>Securities Act</B>&#148;), and the rules and regulations (the&nbsp;&#147;<B>Rules and
Regulations</B>&#148;) of the Securities and Exchange Commission (the&nbsp;&#147;<B>Commission</B>&#148;) thereunder; (ii)&nbsp;has been filed with the Commission under the Securities Act; and (iii)&nbsp;is effective under the Securities Act. Copies
of such registration statement and any amendment thereto have been delivered by the Partnership to the Representatives. As used in this Agreement: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(i) &#147;<B>Applicable Time</B>&#148; means 8:40 a.m., New York City time, on March&nbsp;6, 2012, which the Underwriters have informed the Partnership and its counsel is a time prior to the first sale of
the Units; </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ii) &#147;<B>Base Prospectus</B>&#148; means the base prospectus included in the Registration
Statement at the Applicable Time. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(iii) &#147;<B>Effective Date</B>&#148; means any date as of which any part
of such registration statement relating to the Units became, or is deemed to have become, effective under the Securities Act in accordance with the Rules and Regulations; </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(iv) &#147;<B>Issuer Free Writing Prospectus</B>&#148; means each &#147;free writing prospectus&#148; (as defined in Rule
405 of the Rules and Regulations) or &#147;issuer free writing prospectus&#148; (as defined in Rule 433 of the Rules and Regulations) prepared by or on behalf of the Partnership or used or referred to by the Partnership in connection with the
offering of the Units; </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(v) &#147;<B>Preliminary Prospectus</B>&#148; means any preliminary prospectus
relating to the Units included in such registration statement or filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations, including the Base Prospectus and any preliminary prospectus supplement thereto relating to the Units;
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(vi) &#147;<B>Pricing Disclosure Package</B>&#148; means, as of the Applicable Time, the most recent
Preliminary Prospectus together with (A)&nbsp;the pricing information identified in <U>Schedule II</U> hereto and (B)&nbsp;each Issuer Free Writing Prospectus filed or used by the Partnership on or before the Applicable Time, other than a road show
that is an Issuer Free Writing Prospectus under Rule 433 of the Rules and Regulations; </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">2 </FONT></P>


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 <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(vii) &#147;<B>Prospectus</B>&#148; means the final prospectus relating to
the Units, including the Base Prospectus and any prospectus supplement thereto relating to the Units, as filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations; and </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(viii) &#147;<B>Registration Statement</B>&#148; means the registration statement on Form S-3 (File No.&nbsp;333-162475),
as amended as of the Effective Date, including any Preliminary Prospectus or the Prospectus and all exhibits to such registration statement. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Any reference to the Registration Statement, any Preliminary Prospectus, the Pricing Disclosure Package or the Prospectus shall be deemed to refer to and include any documents incorporated by reference
therein pursuant to Form S-3 under the Securities Act as of the date of such Registration Statement, Preliminary Prospectus or Prospectus, as the case may be, or in the case of the Pricing Disclosure Package, as of the Applicable Time. Any reference
to the &#147;<B>most recent Preliminary Prospectus</B>&#148; shall be deemed to refer to the latest Preliminary Prospectus included in the Registration Statement or filed pursuant to Rule 424(b) of the Rules and Regulations prior to or on the date
hereof (including, for purposes hereof, any documents incorporated by reference therein prior to or on the date hereof). Any reference to any amendment or supplement to any Preliminary Prospectus or the Prospectus shall be deemed to refer to and
include any document filed under the Securities Exchange Act of 1934, as amended (the &#147;<B>Exchange Act</B>&#148;), after the date of such Preliminary Prospectus or the Prospectus, as the case may be, and incorporated by reference in such
Preliminary Prospectus or the Prospectus, as the case may be. Any reference to any amendment to the Registration Statement shall be deemed to include any periodic report of the Partnership filed with the Commission pursuant to Section&nbsp;13(a) or
15(d) of the Exchange Act after the Effective Date that is incorporated by reference in the Registration Statement. As used herein, the term &#147;<B>Incorporated Documents</B>&#148; means the documents that at the time are incorporated by reference
in the Registration Statement, the Preliminary Prospectus or the Prospectus or any amendment or supplement thereto. The Commission has not issued any order preventing or suspending the use of any Preliminary Prospectus or the Prospectus or
suspending the effectiveness of the Registration Statement, and no proceeding for such purpose has been instituted or, to the Partnership&#146;s knowledge, threatened by the Commission. The Commission has not notified the Partnership of any
objection to the use of the form of the Registration Statement. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(b) <I>Form of Documents</I>. The Registration Statement
conformed in all material respects on the Effective Date and on each applicable Delivery Date (as defined herein) will conform, and any amendment to the Registration Statement filed after the date hereof will conform in all material respects when
filed, to the applicable requirements of the Securities Act and the Rules and Regulations. The most recent Preliminary Prospectus conformed, and the Prospectus will conform, in all material respects when filed with the Commission pursuant to Rule
424(b) and on each applicable Delivery Date to the requirements of the Securities Act and the Rules and Regulations. The Incorporated Documents conformed and will conform, when filed with the Commission, in all material respects to the requirements
of the Exchange Act or the Securities Act, as applicable, and the rules and regulations of the Commission thereunder. </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">3 </FONT></P>


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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(c) <I>No Material Misstatements or Omissions in Registration Statement</I>. The
Registration Statement did not, as of its most recent Effective Date, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading;
<U>provided</U> that no representation or warranty is made as to information contained in or omitted from the Registration Statement in reliance upon and in conformity with written information furnished to the Partnership through the Representatives
by or on behalf of any Underwriter specifically for inclusion therein, which information is specified in Section&nbsp;12. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(d)
<I>No Material Misstatements or Omissions in Prospectus</I>. The Prospectus will not, as of its date and on the applicable Delivery Date, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were made, not misleading; <U>provided</U> that no representation or warranty is made as to information contained in or omitted from the Prospectus in reliance upon and in
conformity with written information furnished to the Partnership through the Representatives by or on behalf of any Underwriter specifically for inclusion therein, which information is specified in Section&nbsp;12. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(e) <I>No Material Misstatements or Omissions in Documents Incorporated by Reference</I>. The Incorporated Documents, when filed with the
Commission, did not and will not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(f) <I>No Material Misstatements or Omissions in Pricing Disclosure Package</I>. The Pricing Disclosure Package did not, as
of the Applicable Time, include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; <U>provided</U>
that no representation or warranty is made as to information contained in or omitted from the Pricing Disclosure Package in reliance upon and in conformity with written information furnished to the Partnership through the Representatives by or on
behalf of any Underwriter specifically for inclusion therein, which information is specified in Section&nbsp;12. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(g) <I>No
Material Misstatements or Omissions in Issuer Free Writing Prospectus and Pricing Disclosure Package</I>. Each Issuer Free Writing Prospectus (including, without limitation, any road show that is a free writing prospectus under Rule 433 of the Rules
and Regulations), when considered together with the Pricing Disclosure Package as of the Applicable Time, did not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in
the light of the circumstances under which they were made, not misleading; <U>provided,</U> that no representation or warranty is made as to information contained in or omitted from such Issuer Free Writing Prospectus in reliance upon and in
conformity with written information furnished to the Partnership through the Representatives by or on behalf of any Underwriter specifically for inclusion therein, which information is specified in Section&nbsp;12. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(h) <I>Issuer Free Writing Prospectus Conform to the Requirements of the Securities Act</I>. Each Issuer Free Writing Prospectus
conformed or will conform in all material </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">4 </FONT></P>


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respects to the requirements of the Securities Act and the Rules and Regulations on the date of first use, and the Partnership has complied with any filing requirements applicable to such Issuer
Free Writing Prospectus pursuant to the Rules and Regulations. The Partnership has not made any offer relating to the Units that would constitute an Issuer Free Writing Prospectus without the prior written consent of the Representatives. The
Partnership has retained in accordance with the Rules and Regulations all Issuer Free Writing Prospectuses that were not required to be filed pursuant to the Rules and Regulations. The Partnership has taken all actions necessary so that any road
show (as defined in Rule 433 of the Rules and Regulations) in connection with the offering of the Units will not be required to be filed pursuant to the Rules and Regulations. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(i) <I>Well-Known Seasoned Issuer and Not an Ineligible Issuer</I>. The Partnership is a &#147;well-known seasoned issuer&#148; (as defined in Rule 405 under the Securities Act). At the earliest time
after the initial filing of the Registration Statement that the Partnership or another offering participant made a <I>bona fide</I> offer (within the meaning of Rule 164(h)(2) under the Securities Act) of the Units, the Partnership was not an
&#147;ineligible issuer,&#148; as defined in Rule 405 under the Securities Act. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(j) <I>Formation and Qualification of Certain
Entities</I>. Each of the Partnership, the GP Entities and the Material Subsidiaries has been duly formed or incorporated and is validly existing in good standing as a limited partnership, limited liability company, corporation or unlimited
liability company under the laws of its respective jurisdiction of formation or incorporation with full corporate, partnership, limited liability company or unlimited liability company power and authority, as the case may be, to own or lease its
properties and to conduct its business, in each case in all material respects. Each of the Partnership, the GP Entities and the Material Subsidiaries is duly registered or qualified as a foreign corporation, limited partnership, limited liability
company or unlimited liability company, as the case may be, for the transaction of business under the laws of each jurisdiction (as set forth on <U>Exhibit A</U> to this Agreement) in which the character of the business conducted by it or the nature
or location of the properties owned or leased by it makes such registration or qualification necessary, except where the failure so to register or qualify would not (i)&nbsp;reasonably be expected to have a material adverse effect upon the condition
(financial or other), business, prospects, properties, net worth or results of operations of the Partnership&#146;s direct or indirect majority owned subsidiaries (collectively, the &#147;<B>Subsidiaries</B>&#148;) and the Partnership (collectively,
the &#147;<B>Plains Entities</B>&#148;), taken as a whole (a &#147;<B>Material Adverse Effect</B>&#148;), or (ii)&nbsp;subject the limited partners of the Partnership to any material liability or disability. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(k) <I>General Partners</I>. Each Plains Entity or GP Entity that serves as a general partner of another Plains Entity or GP Entity has
full corporate or limited liability company power and authority, as the case may be, to serve as general partner of such Plains Entity or GP Entity, in each case in all material respects, as disclosed in the Pricing Disclosure Package and the
Prospectus. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(l) <I>Ownership of Interests in the Partnership, the General Partner and Plains AAP</I>. The GP Entities hold
the general partner and membership interests described in the Registration Statement; all of such interests have been duly authorized and validly issued in accordance with their respective limited partnership or limited liability company agreement,
as applicable, and all the membership interests in the General Partner are fully paid (to the extent </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">5 </FONT></P>


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required under the Limited Liability Company Agreement of the General Partner (as the same may be amended or restated prior to the Delivery Date, such agreement being referred to herein as the
&#147;<B>General Partner LLC Agreement</B>&#148;) and nonassessable (except as such nonassessability may be affected by Sections 18-607 and 18-804 of the Delaware Limited Liability Company Act (the &#147;<B>Delaware LLC Act</B>&#148;)); and such
general partner and membership interests held by the GP Entities are owned free and clear of all liens, encumbrances, security interests, equities, charges or claims (&#147;<B>Liens</B>&#148;), except (i)&nbsp;as disclosed in the Pricing Disclosure
Package and the Prospectus or (ii)&nbsp;such as would not reasonably be expected to result in a change of control of the Partnership or reasonably be expected to materially adversely affect the ability of the Plains Entities considered as a whole to
conduct their businesses as currently conducted and as contemplated by the Pricing Disclosure Package and the Prospectus to be conducted. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(m) <I>Ownership of the Material Subsidiaries</I>. All of the outstanding shares of capital stock or other equity interests of each Material Subsidiary (a)&nbsp;have been duly authorized and validly
issued (in accordance with the agreement or certificate of limited partnership, limited liability company agreement, certificate of formation, certificate or articles of incorporation, bylaws or other similar organizational documents (in each case
as in effect on the date hereof and as the same may be amended or restated prior to the Delivery Date) (the &#147;<B>Organizational Documents</B>&#148;) of such Material Subsidiary), are fully paid (in the case of an interest in a limited
partnership or limited liability company, to the extent required under the Organizational Documents of such Material Subsidiary) and nonassessable (except (i)&nbsp;in the case of an interest in a Delaware limited partnership or Delaware limited
liability company, as such nonassessability may be affected by Sections 17-607 and 17-804 of the Delaware Revised Uniform Limited Partnership Act (the &#147;<B>Delaware LP Act</B>&#148;) or Sections 18-607 and 18-804 of the Delaware LLC Act, as
applicable, (ii)&nbsp;in the case of an interest in a limited partnership or limited liability company formed under the laws of another domestic state, as such nonassessability may be affected by similar provisions of such state&#146;s limited
partnership or limited liability company statute, as applicable, and (iii)&nbsp;in the case of an interest in an entity formed under the laws of a foreign jurisdiction, as such nonassessability may be affected by similar provisions of such
jurisdiction&#146;s corporate, partnership or limited liability company statute, if any, as applicable) and (b)&nbsp;except for the portion of the limited partner interest in PAA Natural Gas Storage, L.P. (&#147;<B>PNG</B>&#148;) held by public or
private investors, are owned, directly or indirectly, by the Partnership, free and clear of all Liens. The Subsidiaries other than the Material Subsidiaries did not, individually or in the aggregate, account for (i)&nbsp;more than 10% of the total
assets of the Plains Entities, taken as a whole, as of the most recent fiscal year end or (ii)&nbsp;more than 10% of the net income of the Plains Entities, taken as a whole, for the most recent fiscal year end. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(n) <I>Capitalization</I>.<I> </I>As of the date hereof, the issued and outstanding limited partner interests of the Partnership consist
of 155,568,749 Common Units and the Incentive Distribution Rights (as such capitalized term is defined in the Partnership Agreement). All outstanding Common Units and Incentive Distribution Rights and the limited partner interests represented
thereby have been duly authorized and validly issued in accordance with the Partnership Agreement and are fully paid (to the extent required under the Partnership Agreement) and nonassessable (except as such nonassessability may be affected by
Sections 17-607 and 17-804 of the Delaware LP Act). The limited partner interests of the Partnership conform, in all material respects, as to legal matters to the descriptions thereof contained in the Pricing Disclosure Package and the Prospectus.
</FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(o) <I>Duly Authorized and Validly Issued Units</I>. At the applicable Delivery Date, the
Units to be sold by the Partnership and the limited partner interests represented thereby will be duly authorized in accordance with the Partnership Agreement and, when issued and delivered to the Underwriters against payment therefor in accordance
with the terms hereof, will be validly issued, fully paid (to the extent required under the Partnership Agreement) and nonassessable (except as such nonassessability may be affected by Sections 17-607 and 17-804 of the Delaware LP Act). </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(p) <I>No Preemptive or Other Rights</I>. Except as described in the Pricing Disclosure Package and the Prospectus or as provided in the
Organizational Documents, there are no preemptive rights or other rights to subscribe for or to purchase, nor any restriction upon the voting or transfer of, any interests in the Partnership pursuant to any agreement or other instrument to which the
Partnership is a party or by which the Partnership may be bound. Neither the filing of the Registration Statement nor the offering or sale of the Units as contemplated by this Agreement gives rise to any rights for or relating to the registration of
any Units or other securities of the Partnership, except such rights as have been waived or satisfied. Except (i)&nbsp;as described in the Pricing Disclosure Package and the Prospectus and (ii)&nbsp;for awards issued pursuant to the
Partnership&#146;s long-term incentive plans, there are no outstanding options or warrants to purchase any Common Units or other equity interests in the Partnership. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(q) <I>Authority</I>. The Partnership has all requisite power and authority to issue, sell and deliver the Units, in accordance with and upon the terms and conditions set forth in this Agreement, the
Partnership Agreement, the Registration Statement, the Pricing Disclosure Package and the Prospectus. At the applicable Delivery Date, all action required to be taken by the Partnership or its partners for (i)&nbsp;the due and proper authorization,
execution and delivery of this Agreement, (ii)&nbsp;the authorization, issuance, sale and delivery of the Units and (iii)&nbsp;the consummation of the other transactions contemplated hereby shall have been duly and validly taken. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(r) <I>Authorization, Execution and Delivery of this Agreement</I>. This Agreement has been duly and validly authorized, executed and
delivered by or on behalf of the Partnership. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(s) <I>Authorization, Execution and Enforceability of the Operating
Agreements</I>. The partnership agreement or limited liability company agreement, as applicable, of each of the Partnership, the GP Entities and the Material Subsidiaries has been duly authorized, executed and delivered by the parties thereto and is
a valid and legally binding agreement of such parties thereto, enforceable against the parties thereto in accordance with their respective terms; <U>provided</U>, <U>that</U>, with respect to each such agreement, the enforceability thereof may be
limited by applicable bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or similar laws from time to time in effect affecting creditors&#146; rights and remedies generally and by general principles of equity (regardless of
whether such principles are considered in a proceeding in equity or at law). </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(t) <I>No Conflicts or Violations</I>. None of the offering, issuance and sale by the
Partnership of the Units, the execution, delivery and performance of this Agreement by the Partnership, or the consummation of the transactions contemplated by this Agreement (i)&nbsp;conflicts or will conflict with or constitutes or will constitute
a violation of the Organizational Documents of the Partnership, any of the GP Entities or any of the Material Subsidiaries, (ii)&nbsp;conflicts or will conflict with or constitutes or will constitute a breach or violation of, a change of control or
a default under (or an event that, with notice or lapse of time or both, would constitute such an event), any indenture, mortgage, deed of trust, loan agreement, lease or other agreement or instrument to which the Partnership, any of the GP Entities
or any of the Material Subsidiaries is a party or by which any of them or any of their respective properties may be bound, (iii)&nbsp;violates or will violate any statute, law or regulation or any order, judgment, decree or injunction of any court
or governmental agency or body directed to the Partnership, any of the GP Entities or any of the Material Subsidiaries or any of their properties in a proceeding to which any of them or their property is a party or (iv)&nbsp;results or will result
in the creation or imposition of any Lien upon any property or assets of the Partnership, any of the GP Entities or any of the Material Subsidiaries, which conflicts, breaches, violations, defaults or Liens, in the case of clauses (ii),
(iii)&nbsp;or (iv), would reasonably be expected to have a Material Adverse Effect or materially impair the ability of the Partnership to consummate the transactions contemplated by this Agreement. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(u) <I>No Consents</I>. No consent, approval, authorization, filing with or order of any court, governmental agency or body having
jurisdiction over any of the Plains Entities or the GP Entities or any of their respective properties is required in connection with the offering, issuance and sale by the Partnership of the Units, the execution, delivery and performance of, or the
consummation by the Partnership of the transactions contemplated by this Agreement, except (i)&nbsp;such as have been obtained under the Securities Act, (ii)&nbsp;such as may be required under the blue sky laws of any jurisdiction or the by-laws and
rules of the Financial Industry Regulatory Authority, Inc. (&#147;<B>FINRA</B>&#148;) in connection with the purchase and distribution by the Underwriters of the Units in the manner contemplated herein and in the Pricing Disclosure Package and the
Prospectus and (iii)&nbsp;such that the failure to obtain or make would not reasonably be expected to have a Material Adverse Effect or materially impair the ability of the Partnership to consummate the transactions contemplated by this Agreement.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(v) <I>No Default</I>. (i)&nbsp;None of the Partnership, the GP Entities or the Material Subsidiaries is in violation of its
Organizational Documents in any material respect; (ii)&nbsp;none of the Partnership, the GP Entities or the Material Subsidiaries is in violation of any law, statute, ordinance, administrative or governmental rule or regulation applicable to it or
of any decree of any court or governmental agency or body having jurisdiction over it and (iii)&nbsp;none of the Partnership, the GP Entities or the Material Subsidiaries is in breach, default (or an event that, with notice or lapse of time or both,
would constitute such an event) or violation in the performance of any obligation, covenant or condition contained in any bond, debenture, note or any other evidence of indebtedness or in any agreement, indenture, lease or other instrument to which
it is a party or by which it or any of its properties may be bound, which breach, default or violation, in the case of (ii)&nbsp;or (iii)&nbsp;would, if continued, reasonably be expected to have a Material Adverse Effect or materially impair the
ability of the Partnership to perform its obligations under this Agreement. </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">8 </FONT></P>


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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(w) <I>Independent Registered Public Accounting Firm</I>. PricewaterhouseCoopers LLP, which
has certified the audited financial statements included or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement thereto), are an independent registered
public accounting firm with respect to the GP Entities and the Partnership and its consolidated subsidiaries as required by the Securities Act and the Rules and Regulations and the Public Company Accounting Oversight Board. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(x) <I>Financial Statements</I>. At December&nbsp;31, 2011, the Partnership had, on an as adjusted basis as indicated in the Prospectus
(and any amendment or supplement thereto), an approximate total capitalization as set forth therein. The financial statements (including the related notes and supporting schedules) and other financial information included or incorporated by
reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement thereto) present fairly in all material respects the financial position, results of operations and cash flows of the
entities purported to be shown thereby, at the dates and for the periods indicated, and have been prepared in conformity with generally accepted accounting principles applied on a consistent basis throughout the periods indicated, except to the
extent disclosed therein. The summary and selected historical financial information included or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement
thereto) is accurately presented in all material respects and prepared on a basis consistent with the audited and unaudited historical consolidated financial statements from which it has been derived, except as described therein. The pro forma
financial statements and other pro forma financial information, if any, included or incorporated by reference in the Registration Statement, the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement thereto)
(i)&nbsp;present fairly in all material respects the information shown therein, (ii)&nbsp;have been prepared in accordance with the Commission&#146;s rules and guidelines with respect to pro forma financial statements and (iii)&nbsp;have been
properly computed on the bases described therein. The assumptions used in the preparation of the pro forma financial statements and other pro forma financial information, if any, included or incorporated by reference in the Registration Statement,
the most recent Preliminary Prospectus and the Prospectus (and any amendment or supplement thereto) are reasonable, and the adjustments used therein are appropriate to give effect to the transactions or circumstances referred to therein. No other
financial statements or schedules of the Partnership are required by the Securities Act or the Exchange Act to be included in the Registration Statement, the most recent Preliminary Prospectus or the Prospectus. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(y) <I>No Material Adverse Change</I>. None of the Plains Entities or the GP Entities has sustained, since the date of the latest audited
financial statements included in the Registration Statement, the Pricing Disclosure Package and the Prospectus, any material loss or interference with its business from fire, explosion, flood or other calamity, whether or not covered by insurance,
or from any labor dispute or court or governmental action, investigation, order or decree, other than as set forth or contemplated in the Registration Statement, the Pricing Disclosure Package and the Prospectus and other than as would not
reasonably be expected to have a Material Adverse Effect. Except as disclosed in the Pricing Disclosure Package and the Prospectus, subsequent to the respective dates as of which information is given in the Registration Statement, the Pricing
Disclosure Package and the Prospectus, in each case excluding any amendments or supplements to the foregoing made after the execution of this </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">9 </FONT></P>


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Agreement, there has not been (i)&nbsp;any Material Adverse Effect, or any development that would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect,
(ii)&nbsp;any transaction which is material to the Plains Entities or the GP Entities taken as a whole, other than transactions in the ordinary course of business as such business is described in the Registration Statement, the Pricing Disclosure
Package and the Prospectus or (iii)&nbsp;any dividend or distribution of any kind, other than quarterly distributions of Available Cash (as defined in the Partnership Agreement), declared, paid or made on the security interests of any of the Plains
Entities or the GP Entities, in each case other than as set forth in the Registration Statement, the Pricing Disclosure Package and the Prospectus. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(z) <I>Required Disclosures and Descriptions</I>. There are no legal or governmental proceedings pending or, to the knowledge of the Partnership, threatened, against any of the Plains Entities or the GP
Entities, or to which any of the Plains Entities or the GP Entities is a party, or to which any of their respective properties is subject, that are required to be described in the Registration Statement, the Pricing Disclosure Package or the
Prospectus but are not described as required, and there are no agreements, contracts, indentures, leases or other instruments that are required to be described in the Registration Statement, the Pricing Disclosure Package or the Prospectus or to be
filed as an exhibit to the Registration Statement that are not described or filed as required by the Securities Act or the Exchange Act. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(aa) <I>Title to Properties</I>. The Plains Entities, directly or indirectly, have good and indefeasible title to all real property and good title to all personal property described in the Pricing
Disclosure Package and the Prospectus as being owned by them, free and clear of all Liens except (i)&nbsp;as provided in the Third Amended and Restated Credit Agreement dated August&nbsp;19, 2011, as amended (the &#147;<B>Restated
Facility</B>&#148;), among Plains Marketing, L.P. (&#147;<B>Plains Marketing</B>&#148;), Bank of America, N.A., as administrative agent thereunder and the lenders from time to time party thereto, described in the Pricing Disclosure Package and the
Prospectus and (ii)&nbsp;such as would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect; and all real property and buildings held under lease by the Plains Entities are held, directly or indirectly,
under valid and subsisting and enforceable leases with such exceptions as would not reasonably be expected to have a Material Adverse Effect, as described in the Pricing Disclosure Package and the Prospectus. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(bb) <I>Permits</I>. Each of the Plains Entities, directly or indirectly, has such permits, consents, licenses, franchises, certificates
and authorizations of governmental or regulatory authorities (&#147;<B>Permits</B>&#148;) as are necessary to own its properties and to conduct its business in the manner described in the Pricing Disclosure Package and the Prospectus, subject to
such qualifications as may be set forth in the Pricing Disclosure Package and the Prospectus and except for such Permits the failure of which to have obtained would not reasonably be expected to have, individually or in the aggregate, a Material
Adverse Effect; and none of the Plains Entities has received, directly or indirectly, any notice of proceedings relating to the revocation or modification of any such permit which, individually or in the aggregate, if the subject of an unfavorable
decision, ruling or finding would reasonably be expected to have a Material Adverse Effect, except as set forth in or contemplated in the Pricing Disclosure Package and the Prospectus. </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(cc) <I>Rights-of-Way</I>. Each of the Plains Entities, directly or indirectly, has such
consents, easements, rights-of-way or licenses from any person (&#147;<B>rights-of-way</B>&#148;) as are necessary to conduct its business in the manner described in the Pricing Disclosure Package and the Prospectus, subject to such qualifications
as may be set forth in the Pricing Disclosure Package and the Prospectus and except for such rights-of-way the failure of which to have obtained would not reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect;
each of the Plains Entities, directly or indirectly, has fulfilled and performed all its material obligations with respect to such rights-of-way and no event has occurred that allows, or after notice or lapse of time would allow, revocation or
termination thereof or would result in any impairment of the rights of the holder of any such rights-of-way, except for such failures to perform, revocations, terminations and impairments that would not reasonably be expected to have, individually
or in the aggregate, a Material Adverse Effect, subject in each case to such qualification as may be set forth in the Pricing Disclosure Package and the Prospectus. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(dd) <I>Investment Company</I>. None of the Plains Entities is now, and after sale of the Units to be sold by the Partnership hereunder and application of the net proceeds from such sale as described in
the Pricing Disclosure Package and the Prospectus under the caption &#147;Use of Proceeds,&#148; none of the Plains Entities will be, (i)&nbsp;an &#147;investment company&#148; or a company &#147;controlled by&#148; an &#147;investment
company,&#148; each within the meaning of the Investment Company Act of 1940, as amended (the &#147;<B>Investment Company Act</B>&#148;), (ii)&nbsp;a &#147;gas utility,&#148; within the meaning of Tex. Util. Code &#167;&nbsp;121.001 or (iii)&nbsp;a
&#147;public utility&#148; or &#147;utility&#148; within the meaning of the Public Utility Regulatory Act of Texas or under similar laws of any state in which any such Plains Entity does business; other than in respect of any Plains Entity that is
under the jurisdiction of the California Public Utility Commission. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ee) <I>Environmental Compliance</I>. Except as described
in the Pricing Disclosure Package and the Prospectus, none of the Plains Entities, directly or indirectly, has violated any environmental, safety, health or similar law or regulation applicable to its business relating to the protection of human
health and safety, the environment or hazardous or toxic substances or wastes, pollutants or contaminants (&#147;<B>Environmental Laws</B>&#148;), or lacks any permits, licenses or other approvals required of them under applicable Environmental Laws
to own, lease or operate their properties and conduct their business as described in the Pricing Disclosure Package and the Prospectus or is violating any terms and conditions of any such permit, license or approval, which in each case would
reasonably be expected to have a Material Adverse Effect. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ff) <I>No Labor Disputes</I>. No labor dispute with the employees
of any of the Plains Entities or the GP Entities exists or, to the knowledge of the Partnership, is imminent, that would reasonably be expected to have a Material Adverse Effect. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(gg) <I>Insurance</I>. The Partnership maintains or is entitled to the benefits of insurance covering its properties, operations,
personnel and businesses against such losses and risks as are reasonably adequate to protect it and its businesses in a manner consistent with other businesses similarly situated. All such insurance is outstanding and duly in force on the date
hereof and will be outstanding and duly in force on each applicable Delivery Date, except for such insurance for which the failure to be outstanding and duly in force would not reasonably be expected to have a Material Adverse Effect. </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">11 </FONT></P>



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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(hh) <I>No Legal Actions</I>. Except as described in the Pricing Disclosure Package and the
Prospectus, there is (i)&nbsp;no action, suit or proceeding before or by any court, arbitrator or governmental agency, body or official, domestic or foreign, now pending or, to the knowledge of the Partnership, threatened, to which any of the Plains
Entities or the GP Entities is or may be a party or to which the business or property of any of the Plains Entities or the GP Entities is or may be subject, and (ii)&nbsp;no injunction, restraining order or order of any nature issued by a federal or
state court or foreign court of competent jurisdiction to which any of the Plains Entities or the GP Entities is or may be subject, that, in the case of clauses (i)&nbsp;and (ii)&nbsp;above, would reasonably be expected to have, individually or in
the aggregate, a Material Adverse Effect or prevent or result in the suspension of the offering and issuance of the Units. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ii) <I>Distribution Restrictions</I>. No Subsidiary is currently prohibited, directly or indirectly, from making any distributions to
the Partnership or another Subsidiary, from making any other distribution on such Subsidiary&#146;s equity interests, from repaying to the Partnership or its affiliates any loans or advances to such Subsidiary from the Partnership or its affiliates
or from transferring any of such Subsidiary&#146;s property or assets to the Partnership or any other Subsidiary, except (i)&nbsp;as described in or contemplated by the Pricing Disclosure Package and the Prospectus (exclusive of any amendment or
supplement thereto), (ii)&nbsp;as provided in the Credit Agreement dated August&nbsp;19, 2011 (the &#147;<B>PNG Facility</B>&#148;) among PNG, Bank of America, N.A. and the other lenders from time to time party thereto, as amended, (iii)&nbsp;such
prohibitions mandated by the laws of each such Subsidiary&#146;s state of formation and the terms of any such Subsidiary&#146;s Organizational Documents and (iv)&nbsp;where such prohibition would not reasonably be expected to have a Material Adverse
Effect. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(jj) <I>No Distribution of Other Offering Materials</I>. None of the Plains Entities or the GP Entities has
distributed and, prior to the later to occur of (i)&nbsp;any Delivery Date and (ii)&nbsp;completion of the distribution of the Firm Units or Option Units, as the case may be, will not distribute, any prospectus (as defined under the Securities Act)
in connection with the offering and sale of the Units other than any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus, subject to the conditions in Section&nbsp;1(h) of this Agreement, or other materials, if any, permitted
by the Securities Act, including Rule 134 of the Rules and Regulations. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(kk) <I>NYSE Listing of Common Units</I>. The Common
Units are listed on the New York Stock Exchange (&#147;<B>NYSE</B>&#148;), and prior to the Initial Delivery Date, the Units will be approved for listing on the NYSE subject only to official notice of issuance. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ll) <I>Books and Records; Accounting Controls</I>. The Partnership maintains a system of internal accounting controls sufficient to
provide reasonable assurance that (i)&nbsp;transactions are executed in accordance with management&#146;s general or specific authorization; (ii)&nbsp;transactions are recorded as necessary to permit preparation of financial statements in conformity
with generally accepted accounting principles and to maintain accountability for assets; (iii)&nbsp;access to assets is permitted only in accordance with management&#146;s general or specific authorization; and (iv)&nbsp;the recorded accountability
for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences. </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(mm) <I>Sarbanes-Oxley Act</I>. The Partnership and, to the knowledge of the Partnership,
the directors and officers of GP LLC in their capacities as such, are in compliance in all material respects with all applicable and effective provisions of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated thereunder.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(nn) <I>Disclosure Controls</I>. The Partnership maintains disclosure controls and procedures (to the extent required by and
as such term is defined in Rules 13a-15 and 15d-15 under the Exchange Act), that (i)&nbsp;are designed to provide reasonable assurance that material information relating to the Partnership, including its consolidated subsidiaries, is recorded,
processed, summarized and communicated to the principal executive officer, the principal financial officer and other appropriate officers of GP LLC to allow for timely decisions regarding required disclosure, particularly during the periods in which
the periodic reports required under the Exchange Act are being prepared; (ii)&nbsp;have been evaluated for effectiveness as of the end of the Partnership&#146;s most recent fiscal quarter; and (iii)&nbsp;are effective in all material respects to
perform the functions for which they are established. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(oo) <I>No Deficiency in Internal Controls</I>. Based on the evaluation
of its disclosure controls and procedures conducted in connection with the preparation and filing of the Partnership&#146;s Annual Report on Form 10-K for the most recent fiscal year end, the Partnership is not aware of (i)&nbsp;any significant
deficiency or material weakness in the design or operation of internal controls over financial reporting that are likely to adversely affect its ability to record, process, summarize and report financial data; or (ii)&nbsp;any fraud, whether or not
material, that involves management or other employees who have a significant role in the internal controls over financial reporting of the Partnership. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(pp) <I>FCPA</I>. None of the Plains Entities or the GP Entities nor, to the knowledge of the Partnership, any director, officer, agent or employee of the Plains Entities or the GP Entities (in their
capacity as director, officer, agent or employee) is aware of or has taken any action, directly or indirectly, that would result in a violation by such persons of the Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations
thereunder. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(qq) <I>Money Laundering Laws</I>. No action, suit or proceeding by or before any court or governmental agency,
authority or body or any arbitrator involving the Plains Entities or the GP Entities that involve allegations of money laundering is pending or, to the knowledge of the Partnership, threatened. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(rr) <I>OFAC</I>. None of the Plains Entities or the GP Entities nor, to the knowledge of the Partnership, any director, officer or
employee of the Plains Entities or the GP Entities (in their capacity as director, officer or employee) has received notice that it is subject to any sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ss) <I>XBRL</I>. The interactive data in eXtensible Business Reporting Language incorporated by reference in the
Registration Statement, the Pricing Disclosure Package and the Prospectus fairly presents the information called for in all material respects and has been prepared in accordance with the Commission&#146;s rules and guidelines applicable thereto.
</FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The applicable statements made in the certificates described in Sections 7(i) and 7(l) shall
be deemed representations and warranties by the Partnership, as to matters covered thereby, to the Underwriters. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">2.
<U>Purchase and Sale</U>. (a)&nbsp;Subject to the terms and conditions and in reliance upon the representations and warranties herein set forth, the Partnership agrees to sell to each Underwriter, and each Underwriter agrees, severally and not
jointly, to purchase from the Partnership, at a purchase price of $77.63 per Unit, the number of Firm Units set forth opposite such Underwriter&#146;s name on <U>Schedule&nbsp;I</U> hereto, subject to adjustment as set forth in Section&nbsp;9
hereof. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(b) Subject to the terms and conditions and in reliance upon the representations and warranties herein set forth, the
Partnership hereby grants an option to the several Underwriters to purchase, severally and not jointly, up to 750,000 Option Units at the same purchase price per Unit as the Underwriters shall pay for the Firm Units set forth on <U>Schedule I</U>
hereto. Said option may be exercised in whole or in part at any time and from time to time on or before the 30th day after the date of the Prospectus upon written or telegraphic notice by the Representatives to the Partnership setting forth the
number of Option Units as to which the several Underwriters are exercising the option and the settlement date. The number of Option Units to be purchased by each Underwriter shall be the same percentage of the total number of Option Units to be
purchased by the several Underwriters as such Underwriter is purchasing of the Firm Units, subject to (i)&nbsp;such adjustments as the Representatives in their absolute discretion shall make to eliminate any fractional shares and
(ii)&nbsp;adjustment as set forth in Section&nbsp;9 hereof. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">3. <U>Delivery and Payment</U>. Delivery of and payment for the
Firm Units and the Option Units (if the option provided for in Section&nbsp;2(b) hereof shall have been exercised on or before the third business day prior to the Initial Delivery Date) shall be made at the office of Vinson&nbsp;&amp; Elkins L.L.P.,
1001 Fannin, Houston, Texas 77002 at 9:00 a.m., Houston time, on March&nbsp;9, 2012, or at such time on such later date not more than three business days after the foregoing date as the Representatives shall designate, which date and time may be
postponed by agreement between the Representatives and the Partnership or as provided in Section&nbsp;9 hereof (such date and time of delivery and payment for the Units being herein called the &#147;<B>Initial Delivery Date</B>&#148;). Delivery of
the Units shall be made to the Underwriters for the respective accounts of the several Underwriters against payment by the several Underwriters of the purchase price thereof to or upon the order of the Partnership by wire transfer payable in
same-day funds to an account specified by the Partnership. Delivery of the Firm Units and the Option Units shall be made through the facilities of The Depository Trust Company unless the Representatives shall otherwise instruct. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">If the option provided for in Section&nbsp;2(b) hereof is exercised after the third business day prior to the Initial Delivery Date, the
Partnership will deliver the Option Units (at the expense of the Partnership) to the Representatives on the date (an &#147;<B>Option Units Delivery Date</B>&#148;) specified by the Underwriters (which shall be within three business days after each
exercise of said option), for the respective accounts of the several Underwriters, against payment by the several Underwriters of the purchase price thereof to or upon the order of the Partnership by wire transfer payable in same-day funds to an
account specified by the Partnership. If </FONT></P>
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settlement for the Option Units occurs after the Initial Delivery Date, the Partnership will deliver to the Underwriters on the Option Units Delivery Date for the Option Units, and the obligation
of the Underwriters to purchase the Option Units shall be conditioned upon receipt of, supplemental opinions, certificates and letters confirming as of such date the opinions, certificates and letters delivered on the Initial Delivery Date pursuant
to Section&nbsp;7 hereof. The Initial Delivery Date and any Option Units Delivery Date are each sometimes referred to as a &#147;<B>Delivery Date</B>.&#148; </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">4. <U>Offering by the Underwriters</U>. It is understood that the several Underwriters propose to offer the Units for sale to the public as set forth in the Prospectus. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">5. <U>Agreements of the Partnership</U>. The Partnership acknowledges and agrees with the Underwriters that: </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(a) <I>Post-Effective Amendments</I>. If, at the Applicable Time, it is necessary for a post-effective amendment to the Registration
Statement to be declared effective before the offering of the Units may commence, the Partnership will endeavor to cause such post-effective amendment to become effective as soon as possible and will advise the Representatives promptly and, if
requested by the Representatives, will confirm such advice in writing when such post-effective amendment has become effective. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(b) <I>Preparation of Prospectus and Registration Statement</I>. The Partnership will advise the Representatives promptly and, if
requested by the Representatives, will confirm such advice in writing: (i)&nbsp;of any request by the Commission for amendment of or a supplement to the Registration Statement, the Preliminary Prospectus or the Prospectus or for additional
information; (ii)&nbsp;of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or of the suspension of qualification of the Units for offering or sale in any jurisdiction or the initiation of
any proceeding for such purpose; and (iii)&nbsp;within the period of time referred to in paragraph (e)&nbsp;below, of any change in the condition (financial or other), business, prospects, properties, net worth or results of operations of the Plains
Entities, taken as a whole, or of the happening of any event that makes any statement of a material fact made in the Registration Statement, the Pricing Disclosure Package or the Prospectus (as then amended or supplemented) untrue or that requires
the making of any additions to or changes in the Registration Statement, the Pricing Disclosure Package or the Prospectus (as then amended or supplemented) in order to state a material fact required by the Securities Act or the regulations
thereunder to be stated therein or necessary in order to make the statements therein (in the case of any Preliminary Prospectus or the Prospectus, in the light of the circumstances under which any such statements were made) not misleading, or of the
necessity to amend or supplement the Prospectus (as then amended or supplemented) to comply with the Securities Act or any other applicable law. If at any time the Commission shall issue any stop order suspending the effectiveness of the
Registration Statement, the Partnership will make every commercially reasonable effort to obtain the withdrawal of such order at the earliest possible time. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(c) <I>Copies of Registration Statement</I>. The Partnership will furnish to the Underwriters, without charge, (i)&nbsp;one copy of the manually signed copy of the registration statement corresponding to
the Commission&#146;s electronic data gathering, analysis and retrieval system (&#147;<B>EDGAR</B>&#148;) version filed with the Commission and of each amendment thereto, </FONT></P>
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including financial statements and all exhibits to the registration statement, (ii)&nbsp;such number of conformed copies of the registration statement as originally filed and of each amendment
thereto, but without exhibits, as the Underwriters or the Underwriters&#146; counsel may reasonably request, (iii)&nbsp;such number of copies of the Incorporated Documents, without exhibits, as the Underwriters may request, and (iv)&nbsp;such number
of copies of the exhibits to the Incorporated Documents as the Underwriters may request. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(d) <I>Filing of Amendment or
Supplement</I>. For such period as in the opinion of counsel for the Underwriters a prospectus is required by the Securities Act to be delivered in connection with sales by any Underwriter or dealer, the Partnership will not file any amendment to
the Registration Statement, supplement to the Prospectus (or any other prospectus relating to the Units filed pursuant to Rule&nbsp;424(b) of the Rules and Regulations that differs from the Prospectus as filed pursuant to such Rule 424(b)), or any
Preliminary Prospectus or Issuer Free Writing Prospectus of which the Representatives shall not previously have been advised or to which the Representatives shall have reasonably objected in writing after being so advised unless the Partnership
shall have determined based upon the advice of counsel that such amendment, supplement or other filing is required by law; and the Partnership will promptly notify the Representatives after it shall have received notice thereof of the time when any
amendment to the Registration Statement becomes effective or when any supplement to the Prospectus has been filed. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(e)
<I>Copies of Documents to the Underwriters</I>. As soon after the Applicable Time as possible and thereafter from time to time for such period as in the opinion of counsel for the Underwriters a prospectus is required by the Securities Act to be
delivered in connection with sales by any Underwriter or dealer, the Partnership will expeditiously deliver to each Underwriter and each dealer that the Underwriters may specify, without charge, as many copies of the Prospectus (and of any amendment
or supplement thereto) as the Underwriters may reasonably request. At any time after nine months after the time of issuance of the Prospectus, upon request and without charge, the Partnership will deliver as many copies of an amended or supplemented
Prospectus complying with Section&nbsp;10(a)(3) of the Securities Act as the Underwriters may reasonably request, provided that a prospectus is required by the Securities Act to be delivered in connection with sales of Units by any Underwriter or
dealer. The Partnership consents to the use of the Prospectus (and of any amendment or supplement thereto) in accordance with the provisions of the Securities Act and with the securities or Blue Sky laws of the jurisdictions in which the Units are
offered by the Underwriters and by all dealers to whom Units may be sold, both in connection with the offering and sale of the Units and for such period of time thereafter as the Prospectus is required by the Securities Act to be delivered in
connection with sales by any Underwriter or dealer. If during such period of time any event shall occur that in the judgment of the Partnership or in the opinion of counsel for the Underwriters and the Partnership is required to be set forth in the
Prospectus (as then amended or supplemented) or should be set forth therein in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, or if it is necessary to supplement or amend the
Prospectus (or to file under the Exchange Act any document which, upon filing, becomes an Incorporated Document) to comply with the Securities Act or any other law, the Partnership will forthwith prepare and, subject to the provisions of paragraph
(e)&nbsp;above, file with the Commission an appropriate supplement or amendment thereto (or to such document), and will expeditiously furnish to the Underwriters and dealers a reasonable number
</FONT></P>
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of copies thereof; provided that, if any such event necessitating a supplement or amendment to the Prospectus occurs at any time after nine months after the time of issuance of the Prospectus,
such supplement or amendment shall be prepared at the Underwriters&#146; expense. In the event that the Partnership and the Representatives agree that the Prospectus should be amended or supplemented, the Partnership, if requested by the
Representatives, will promptly issue a press release announcing or disclosing the matters to be covered by the proposed amendment or supplement unless the Partnership shall have determined, based on the advice of counsel, that the issuance of such
press release would not be required by law. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(f) <I>Blue Sky Laws</I>. The Partnership will cooperate with the Representatives
and with counsel for the Underwriters in connection with the registration or qualification of the Units for offering and sale by the Underwriters and by dealers under the securities or Blue Sky laws of such jurisdictions as the Underwriters may
reasonably designate and will file such consents to service of process or other documents reasonably necessary or appropriate in order to effect such registration or qualification; provided that in no event shall any Plains Entity be obligated to
qualify to do business in any jurisdiction where it is not now so qualified or to take any action that would subject it to service of process in suits, other than those arising out of the offering or sale of the Units, in any jurisdiction where it
is not now so subject. The Partnership will promptly notify the Representatives of the receipt by the Partnership of any notification with respect to the suspension of the qualification of the Units for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(g) <I>Reports to Security Holders</I>. In accordance with Section&nbsp;11(a)
of the Securities Act and Rule&nbsp;158 of the Rules and Regulations, the Partnership will make generally available to its security holders an earnings statement (which need not be audited) in reasonable detail covering the 12-month period beginning
not later than the first day of the month next succeeding the month in which occurred the effective date (within the meaning of Rule 158) of the Registration Statement as soon as practicable after the end of such period. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(h) <I>Copies of Reports</I>. Unless otherwise available on EDGAR, during the period of two years hereafter, the Partnership will furnish
or make available to the Underwriters (i)&nbsp;as soon as publicly available, a copy of each report of the Partnership mailed to unitholders or filed with the Commission or the principal national securities exchange or automated quotation system
upon which the Units may be listed, and (ii)&nbsp;from time to time such other information concerning the Partnership as the Underwriters may reasonably request. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(i) <I>Termination Expenses</I>. If this Agreement shall terminate or shall be terminated after execution pursuant to any provisions hereof (otherwise than pursuant to Section&nbsp;9 hereof or
Section&nbsp;10 hereof (except pursuant to the first clause of Section&nbsp;10(i))) or if this Agreement shall be terminated by the Underwriters because of any failure or refusal on the part of the Partnership to comply with the terms or fulfill any
of the conditions of this Agreement, the Partnership agrees to reimburse the Underwriters for all reasonable out-of-pocket expenses (including reasonable fees and expenses of counsel for the Underwriters) incurred by the Underwriters in connection
herewith. </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(j) <I>Application of Proceeds</I>. The Partnership will apply the net proceeds from the
sale of the Units in accordance with the description set forth under the caption &#147;Use of Proceeds&#148; in the Pricing Disclosure Package and the Prospectus. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(k) <I>Filing of Prospectus</I>. The Partnership will timely file the Prospectus, and any amendment or supplement thereto, pursuant to Rule 424(b) of the Rules and Regulations and will advise the
Underwriters of the time and manner of such filing. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(l) <I>Lock-Up Period</I>. Except as provided in this Agreement, the
Partnership will not (i)&nbsp;offer, sell, contract to sell, pledge or otherwise dispose of (or enter into any transaction that is designed to, or might reasonably be expected to, result in the disposition (whether by actual disposition or effective
economic disposition due to cash settlement or otherwise) by the Partnership or any of its controlled affiliates or any person in privity with the Partnership or any of its controlled affiliates) directly or indirectly, including the filing (or
participation in the filing) of a registration statement with the Commission in respect of, or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section&nbsp;16 of the Exchange
Act with respect to, any Common Units or any securities that are convertible into, or exercisable or exchangeable for, or that represent the right to receive, Common Units or any securities that are senior to or <I>pari passu</I> with Common Units,
or publicly announce an intention to effect any such transaction or (ii)&nbsp;grant any options or warrants to purchase Common Units for a period of 45 days after the date of the Prospectus (the &#147;<B>Lock-Up Period</B>&#148;) without the prior
written consent of Barclays Capital Inc., except that (A)&nbsp;the Partnership may issue the Units, (B)&nbsp;the Partnership may issue Common Units or any securities convertible or exchangeable into Common Units as payment of any part of the
purchase price for businesses that are acquired by the Partnership and its affiliates or any third parties, <U>provided</U> that any recipient of such Common Units must agree in writing to be bound by the terms of this Section&nbsp;5(l) for the
remaining term of the Lock-Up Period, (C)&nbsp;the Partnership may issue and sell Common Units or securities convertible into or exchangeable for Common Units pursuant to any existing long-term incentive plan, employee unit option plan, unit
ownership plan or dividend reinvestment plan of the Partnership (or adopted by a GP Entity) in effect at the Applicable Time and (D)&nbsp;the Partnership may issue or deliver Common Units issuable upon the conversion, vesting or exercise of
securities (including long-term incentive plan awards, options and warrants) outstanding at the Applicable Time. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(m)
<I>Stabilization</I>. Except as stated in this Agreement and the Prospectus, the Partnership has not taken, nor will it take, directly or indirectly, any action designed to or that might reasonably be expected to cause or result in stabilization or
manipulation of the price of the Common Units to facilitate the sale or resale of the Units. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(n) <I>Investment Company</I>.
The Partnership will take such steps as shall be necessary to ensure that none of the Plains Entities or the GP Entities shall become an &#147;investment company&#148; within the meaning of such term under the Investment Company Act of 1940, as
amended, and the rules and regulations of the Commission thereunder. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(o) <I>Additional Capital Contributions</I>. Upon the
issuance of the Units by the Partnership, the General Partner shall make the additional capital contributions to the Partnership as required by Section&nbsp;5.2(b) of the Partnership Agreement. </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(p) <I>Exchange Act Reports</I>. The Partnership, during the period when the Prospectus is
required to be delivered under the Securities Act, will file all documents required to be filed with the Commission pursuant to the Exchange Act within the time periods required by the Exchange Act. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(q) <I>Free Writing Prospectuses</I>. The Partnership has complied and will comply with the requirements of Rule 433 under the Securities
Act applicable to any Issuer Free Writing Prospectus, including appropriate legending and timely filing with the Commission or retention where required. The Partnership represents that it has satisfied and agrees that it will satisfy the conditions
under Rule 433 under the Securities Act to avoid a requirement to file with the Commission any electronic road show. The Partnership agrees that if at any time following issuance of an Issuer Free Writing Prospectus any event occurred or occurs as a
result of which such Issuer Free Writing Prospectus would conflict with the information in the Registration Statement, the most recent Preliminary Prospectus or the Prospectus or would include an untrue statement of a material fact or omit to state
any material fact necessary in order to make the statements therein, in the light of the circumstances then prevailing, not misleading, the Partnership will give prompt notice thereof to the Representatives and, if requested by the Representatives,
will prepare and furnish without charge to each Underwriter an Issuer Free Writing Prospectus or other document that will correct such conflict, statement or omission; <U>provided</U>, <U>however</U>, that this representation and warranty shall not
apply to any statements or omissions in an Issuer Free Writing Prospectus made in reliance upon and in conformity with information furnished in writing to the Partnership by an Underwriter through the Representatives expressly for use therein, which
information is specified in Section&nbsp;12. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">6. <U>Indemnification and Contribution</U>. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(a) The Partnership agrees to indemnify and hold harmless each Underwriter, the directors, officers, employees and agents of each
Underwriter, each affiliate of any Underwriter who has participated in the distribution of the Units as underwriters, each broker-dealer affiliate of any Underwriter and each other affiliate of any Underwriter within the meaning of Rule 405 of the
Rules and Regulations, and each person, if any, who controls any Underwriter within the meaning of Section&nbsp;15 of the Securities Act or Section&nbsp;20 of the Exchange Act from and against any and all losses, claims, damages, liabilities and
expenses, joint or several (including reasonable costs of investigation), to which they or any of them became subject under the Securities Act, the Exchange Act or otherwise, insofar as such losses, claims, damages, liabilities or expenses arise out
of, or are based upon, (i)&nbsp;any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus or in any amendment or
supplement thereto or in any &#147;road show&#148; (as defined in Rule 433 of the Rules and Regulations) not constituting an Issuer Free Writing Prospectus (a &#147;<B>Non-Prospectus Road Show</B>&#148;) or (ii)&nbsp;the omission or alleged omission
to state in the Registration Statement, any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus or in any amendment or supplement thereto or in any Non-Prospectus Road Show, any material fact required to be stated therein or
necessary to make the statements therein (in the case of any Preliminary Prospectus or the Prospectus, in the light of the circumstances under which any such statements were made) not misleading, and shall reimburse each Underwriter and each such
director, officer, employee or controlling person promptly upon demand for any legal or other expenses </FONT></P>
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reasonably incurred by that Underwriter, director, officer, employee or controlling person in connection with investigating or defending or preparing to defend against any such loss, claim,
damage, liability or action as such expenses are incurred; <U>provided</U>, <U>however</U>, that the Partnership shall not be liable in any such case to the extent that any such loss, claim, damage, liability or action arises out of, or is based
upon, any untrue statement or alleged untrue statement or omission or alleged omission made in the Registration Statement, any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus or in any such amendment or supplement thereto
or in any Non-Prospectus Road Show, in reliance upon and in conformity with written information concerning such Underwriter furnished to the Partnership through the Representatives by or on behalf of any Underwriter specifically for inclusion
therein, which information consists solely of the information specified in Section&nbsp;12. The foregoing indemnity agreement is in addition to any liability that the Partnership may otherwise have to any Underwriter or to any director, officer,
employee or controlling person of that Underwriter. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(b) If any action, suit or proceeding shall be brought against any
Underwriter, any director, officer, employee or agent of any Underwriter or any person controlling any Underwriter in respect of which indemnity may be sought against the Partnership, such Underwriter or such director, officer, employee, agent or
controlling person shall promptly notify the Partnership in writing, and the Partnership shall assume the defense thereof, including the employment of counsel reasonably satisfactory to such indemnified party and payment of all reasonable fees and
expenses. The failure to notify the indemnifying party shall not relieve it from liability that it may have to an indemnified party unless the indemnifying party is foreclosed by reason of such delay from asserting a defense otherwise available to
it. Such Underwriter or any such director, officer, employee, agent or controlling person shall have the right to employ separate counsel in any such action, suit or proceeding and to participate in (but not control) the defense thereof, but the
fees and expenses of such counsel shall be at the expense of such Underwriter or such director, officer, employee, agent or controlling person unless (i)&nbsp;the Partnership has agreed in writing to pay such fees and expenses, (ii)&nbsp;the
Partnership has failed to assume the defense and employ counsel within a reasonable period of time in light of the circumstances or (iii)&nbsp;such indemnified party or parties shall have reasonably concluded, based on the advice of counsel, that
there may be defenses available to it or them that are different from, additional to or in conflict with those available to the Partnership (in which case the Partnership shall not have the right to direct the defense of such action, suit or
proceeding on behalf of the indemnified party or parties), in any of which events the Partnership shall pay the reasonable fees and expenses of such counsel as such fees and expenses are incurred (it being understood, however, that the Partnership
shall not be liable for the expenses of more than one separate counsel (in addition to any local counsel) in any one action, suit or proceeding or series of related actions, suits or proceedings in the same jurisdiction representing the indemnified
parties who are parties to such action, suit or proceeding). </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(c) Each Underwriter agrees, severally and not jointly, to
indemnify and hold harmless the Partnership, GP LLC&#146;s directors and the officers who sign the Registration Statement, and any person who controls the Partnership within the meaning of Section&nbsp;15 of the Securities Act or Section&nbsp;20 of
the Exchange Act, to the same extent as the foregoing indemnity from the Partnership to each Underwriter, but only with respect to information furnished in writing by or on behalf of such Underwriter through the Representatives expressly for use in
the Registration Statement, any Preliminary Prospectus, the Prospectus, any Issuer Free Writing </FONT></P>
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Prospectus or in any amendment or supplement thereto or in any Non-Prospectus Road Show, which information is limited to the information set forth in Section&nbsp;12. If any action, suit or
proceeding shall be brought against the Partnership, any of such directors and officers or any such controlling person based on the Registration Statement, any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus or in any
amendment or supplement thereto or in any Non-Prospectus Road Show, and in respect of which indemnity may be sought against any Underwriter pursuant to this paragraph (c), such Underwriter shall have the rights and duties given to the Partnership by
paragraph (b)&nbsp;above (except that if the Partnership shall have assumed the defense thereof such Underwriter shall not be required to do so, but may employ separate counsel therein and participate in (but not control) the defense thereof, but
the fees and expenses of such counsel shall be at such Underwriter&#146;s expense), and the Partnership, any of such directors and officers and any such controlling person shall have the rights and duties given to the Underwriters by paragraph
(b)&nbsp;above. The foregoing indemnity agreement shall be in addition to any liability that the Underwriters may otherwise have. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(d) If the indemnification provided for in this Section&nbsp;6 is unavailable to an indemnified party under paragraph (a)&nbsp;or (c)&nbsp;hereof in respect of any losses, claims, damages, liabilities or
expenses referred to therein, then an indemnifying party, in lieu of indemnifying such indemnified party, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages, liabilities or expenses
(i)&nbsp;in such proportion as is appropriate to reflect the relative benefits received by the Partnership on the one hand and the Underwriters on the other hand from the offering of the Units, or (ii)&nbsp;if the allocation provided by clause
(i)&nbsp;above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i)&nbsp;above but also the relative fault of the Partnership on the one hand and the
Underwriters on the other in connection with the statements or omissions that resulted in such losses, claims, damages, liabilities or expenses, as well as any other relevant equitable considerations. The relative benefits received by the
Partnership on the one hand and the Underwriters on the other shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Partnership bear to the total underwriting discounts
and commissions received by the Underwriters, in each case as set forth in the table on the cover page of the Prospectus. The relative fault of the Partnership on the one hand and the Underwriters on the other hand shall be determined by reference
to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Partnership or any affiliate of the Partnership on the one
hand, or by the Underwriters on the other hand, and the parties&#146; relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(e) The Partnership and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section&nbsp;6
were determined by a pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in paragraph (d)&nbsp;above.
The amount paid or payable by an indemnified party as a result of the losses, claims, damages, liabilities and expenses referred to in paragraph (d)&nbsp;above shall be deemed to include, subject to the limitations set forth above, any legal or
other expenses reasonably incurred by such indemnified party in connection with investigating any claim or defending any such action, suit or proceeding. Notwithstanding the provisions of this Section&nbsp;6, no Underwriter shall be
</FONT></P>
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required to contribute any amount in excess of the amount by which the total price of the Units underwritten by it and distributed to the public exceeds the amount of any damages that such
Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section&nbsp;11(f) of the Securities Act)
shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters&#146; obligations to contribute as provided in this Section&nbsp;6 are several and not joint. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(f) No indemnifying party shall (i)&nbsp;without the prior written consent of the indemnified parties (which consent shall not be
unreasonably withheld), settle or compromise or consent to the entry of any judgment with respect to any pending or threatened claim, action, suit or proceeding in respect of which indemnification or contribution may be sought hereunder (whether or
not the indemnified parties are actual or potential parties to such claim or action) unless such settlement, compromise or consent includes an unconditional release of each indemnified party from all liability arising out of such claim, action, suit
or proceeding and does not include any findings of fact or admissions of fault or culpability as to the indemnified party, or (ii)&nbsp;be liable for any settlement of any such action effected without its written consent (which consent shall not be
unreasonably withheld), but if settled with the consent of the indemnifying party or if there be a final judgment for the plaintiff in any such action, the indemnifying party agrees to indemnify and hold harmless any indemnified party from and
against any loss or liability by reason of such settlement or judgment. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(g) Any losses, claims, damages, liabilities or
expenses for which an indemnified party is entitled to indemnification or contribution under this Section&nbsp;6 shall be paid by the indemnifying party to the indemnified party as such losses, claims, damages, liabilities or expenses are incurred.
The indemnity and contribution agreements contained in this Section&nbsp;6 and the covenants, representations and warranties of the Partnership set forth in this Agreement shall remain operative and in full force and effect, regardless of
(i)&nbsp;any investigation made by or on behalf of any Underwriter or any person controlling any Underwriter, the Partnership or any of GP LLC&#146;s directors or officers or any person controlling the Partnership, (ii)&nbsp;acceptance of any Units
and payment therefor in accordance with the terms of this Agreement, and (iii)&nbsp;any termination of this Agreement. A successor to any Underwriter or any person controlling any Underwriter, or to the Partnership or any of GP LLC&#146;s directors
or officers or any person controlling the Partnership shall be entitled to the benefits of the indemnity, contribution and reimbursement agreements contained in this Section&nbsp;6. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">7. <U>Conditions to the Obligations of the Underwriters</U>. The several obligations of the Underwriters to purchase the Firm Units and
the Option Units, as the case may be, hereunder are subject to the following conditions: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(a) All filings required by Rule 424
and Rule 430B of the Rules and Regulations shall have been made. All material required to be filed by the Partnership pursuant to Rule&nbsp;433(d) under the Securities Act shall have been filed with the Commission within the applicable time period
prescribed for such filing by Rule&nbsp;433 under the Securities Act. No stop order (i)&nbsp;suspending the effectiveness of the Registration Statement or (ii)&nbsp;suspending or preventing the use of the most recent Preliminary Prospectus, the
Prospectus or any Issuer Free Writing Prospectus shall have been issued and no proceeding for that purpose shall have been </FONT></P>
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instituted or, to the knowledge of the Partnership or any Underwriter, threatened by the Commission, and any request of the Commission for additional information (to be included in the
Registration Statement or the Prospectus or otherwise) shall have been complied with to the reasonable satisfaction of the Representatives. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(b) Subsequent to the Applicable Time, there shall not have occurred (i)&nbsp;any change, or any development involving a prospective change that would reasonably be expected to have a Material Adverse
Effect, not contemplated by the Prospectus, which in the Representatives&#146; opinion, would materially adversely affect the market for the Units, or (ii)&nbsp;any event or development relating to or involving any of the Plains Entities or any
executive officer or director of any of such entities that makes any statement made in the Prospectus untrue or which, in the opinion of the Partnership and its counsel or the Underwriters and their counsel, requires the making of any addition to or
change in the Prospectus in order to state a material fact required by the Securities Act or any other law to be stated therein or necessary in order to make the statements therein, in the light of the circumstances under which they were made, not
misleading, if amending or supplementing the Prospectus to reflect such event or development would, in the Representatives&#146; opinion, materially adversely affect the market for the Units. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(c) The Representatives shall have received on each applicable Delivery Date, an opinion of Vinson&nbsp;&amp; Elkins L.L.P., counsel for
the Partnership, dated the applicable Delivery Date and addressed to the Underwriters, to the effect that: </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(i) Each of the
Partnership, the GP Entities and the Domestic Subsidiaries has been duly formed or incorporated and is validly existing in good standing as a limited partnership, limited liability company or corporation under the laws of its respective jurisdiction
of formation or incorporation with full corporate, limited partnership or limited liability company power and authority, as the case may be, to own or lease its properties and to conduct its business, in each case in all material respects.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ii) Each Domestic Subsidiary or GP Entity that serves as a general partner of another Domestic Subsidiary or GP Entity has
full corporate or limited liability company power and authority, as the case may be, to serve as general partner of such Domestic Subsidiary or GP Entity, in each case in all material respects. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(iii) The GP Entities hold the general partner and membership interests described in the Registration Statement; all of such interests
have been duly authorized and validly issued in accordance with their respective limited partnership or limited liability company agreement, as applicable, and all the membership interests in the General Partner are fully paid (to the extent
required under the General Partner LLC Agreement) and nonassessable (except as such assessability may be affected by Sections 18-607 and 18-804 of the Delaware LLC Act). </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(iv) All of the outstanding shares of capital stock or other equity interests (other than general partner interests) of each Domestic Subsidiary (a)&nbsp;have been duly authorized and validly issued (in
the case of an interest in a limited </FONT></P>
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partnership or limited liability company, in accordance with the Organizational Documents of such Domestic Subsidiary), are fully paid (in the case of an interest in a limited partnership or
limited liability company, to the extent required under the Organizational Documents of such Domestic Subsidiary) and nonassessable (except (i)&nbsp;in the case of an interest in a Delaware limited partnership or Delaware limited liability company,
as such nonassessability may be affected by Sections 17-607 and 17-804 of the Delaware LP Act or Sections 18-607 and 18-804 of the Delaware LLC Act, as applicable, (ii)&nbsp;in the case of an interest in a limited partnership or limited liability
company formed under the laws of another domestic state, as such nonassessability may be affected by similar provisions of such state&#146;s limited partnership or limited liability company statute, as applicable) and (b)&nbsp;except for the portion
of the limited partnership interest in PNG held by public investors, are owned, directly or indirectly, by the Partnership, free and clear of all Liens (A)&nbsp;in respect of which a financing statement under the Uniform Commercial Code of the
States of Delaware or Texas naming the Partnership as debtor or, in the case of capital stock or other equity interests of a Domestic Subsidiary owned directly by one or more other Domestic Subsidiary, naming any such other Domestic Subsidiary as
debtor(s), is on file in the office of the Secretary of State of the States of Delaware or Texas or (B)&nbsp;otherwise known to such counsel, without independent investigation, other than those created by or arising under the corporate, limited
liability company or partnership laws of the jurisdiction of formation or incorporation of the respective Domestic Subsidiary, as the case may be. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(v) All outstanding general partner interests in each Domestic Subsidiary that is a partnership have been duly authorized and validly issued in accordance with the Organizational Documents of such
Domestic Subsidiary and are owned, directly or indirectly, by the Partnership, free and clear of all Liens (A)&nbsp;in respect of which a financing statement under the Uniform Commercial Code of the States of Delaware or Texas naming the Partnership
as debtor or, in the case of general partner interests of a Domestic Subsidiary owned directly by one or more other Domestic Subsidiary, naming any such other Domestic Subsidiary as debtor(s), is on file in the office of the Secretary of State of
the States of Delaware or Texas or (B)&nbsp;otherwise known to such counsel, without independent investigation, other than those created by or arising under the partnership laws of the jurisdiction of formation of the respective Domestic Subsidiary,
as the case may be. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(vi) The Firm Units (and/or Option Units, as applicable) to be issued and sold to the Underwriters by the
Partnership pursuant to this Agreement and the limited partner interests represented thereby have been duly authorized by the Partnership Agreement and, when issued and delivered against payment therefor as provided in this Agreement, will be
validly issued, fully paid (to the extent required under the Partnership Agreement) and nonassessable (except as such nonassessability may be affected by Sections 17-607 and 17-804 of the Delaware LP Act). </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(vii) Except as have been waived or satisfied, there are no preemptive rights or other rights to subscribe for or to purchase, nor any
restriction upon the voting or </FONT></P>
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transfer of, any interests in the Partnership pursuant to the Organizational Documents of the Partnership or any of the Incorporated Documents to which the Partnership is a party or by which the
Partnership may be bound. Neither the filing of the Registration Statement nor the offering or sale of the Units as contemplated by this Agreement gives rise to any rights for or relating to the registration of any Units or other securities of the
Partnership pursuant to any of the documents or agreements included as exhibits to any of the Incorporated Documents, except such rights as have been waived or satisfied. The Partnership has all requisite power and authority to issue, sell and
deliver the Units, in accordance with and upon the terms and conditions set forth in this Agreement, the Partnership Agreement and the Registration Statement, the Pricing Disclosure Package and the Prospectus. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(viii) This Agreement has been duly authorized and validly executed and delivered by the Partnership. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ix) At or before each applicable Delivery Date, the partnership agreement or limited liability company agreement, as applicable, of each
of the Partnership, the Domestic Subsidiaries and the GP Entities has been duly authorized, executed and delivered by the parties thereto and is a valid and legally binding agreement of such parties thereto, enforceable against the parties thereto
in accordance with their respective terms; provided, that, with respect to each such agreement, the enforceability thereof may be limited by (A)&nbsp;applicable bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or similar laws
from time to time in effect affecting creditors&#146; rights and remedies generally and by general principles of equity (regardless of whether such principles are considered in a proceeding in equity or at law) and (B)&nbsp;public policy, applicable
law relating to fiduciary duties and indemnification and an implied covenant of good faith and fair dealing. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(x) None of the
offering, issuance and sale by the Partnership of the Units, the execution, delivery and performance of this Agreement by the Partnership or the consummation of the transactions contemplated by this Agreement (A)&nbsp;constitutes or will constitute
a violation of the Organizational Documents of the Partnership or any of the Domestic Subsidiaries or the GP Entities, (B)&nbsp;conflicts or will conflict with or constitutes or will constitute a breach or violation of, a change of control or a
default under (or an event that, with notice or lapse of time or both, would constitute such an event) any document or agreement filed as an exhibit to the Registration Statement, any Incorporated Document, the Credit Agreement dated January&nbsp;3,
2008 (as amended, the &#147;<B>Plains AAP Facility</B>&#148;), by and among Plains AAP, the lenders party thereto and Citibank, N.A., as Administrative Agent or the PNG Facility, (C)&nbsp;results or will result in any violation of the Delaware LP
Act, the Delaware LLC Act, the Delaware General Corporation Law (the &#147;<B>DGCL</B>&#148;), the laws of the State of Texas or federal law, or (D)&nbsp;results or will result in the creation or imposition of any Lien upon any property or assets of
any of the Partnership, the Domestic Subsidiaries or the GP Entities, which conflicts, breaches, violations or defaults in the case of clauses (B), (C)&nbsp;or (D)&nbsp;would </FONT></P>
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reasonably be expected to have a Material Adverse Effect or materially impair the ability of the Partnership to consummate the transactions contemplated by this Agreement, it being understood
that such counsel need not express an opinion in clause (C)&nbsp;of this paragraph (x)&nbsp;with respect to any securities or other anti-fraud law. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(xi) No consent, approval, authorization, filing with or order of any federal, Delaware or Texas court, governmental agency or body having jurisdiction over the Partnership, the GP Entities the Domestic
Subsidiaries or any of their respective properties is required in connection with the transactions contemplated by this Agreement, the execution, delivery and performance of this Agreement by the Partnership and the consummation of the transactions
contemplated by this Agreement, except (A)&nbsp;such as may be required under the blue sky laws of any jurisdiction or the by-laws and rules of FINRA in connection with the purchase and distribution by the Underwriters of the Units in the manner
contemplated herein and in the Pricing Disclosure Package and the Prospectus (as to which such counsel need not express any opinion), (B)&nbsp;such that the failure to obtain would not reasonably be expected to have a Material Adverse Effect or
materially impair the ability of the Partnership to consummate the transactions contemplated by this Agreement and (C)&nbsp;such other that have been obtained or taken and are in full force and effect. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(xii) The statements in the Registration Statement, the Pricing Disclosure Package and the Prospectus under the captions
&#147;Description of Our Common Units,&#148; &#147;Cash Distribution Policy&#148; and &#147;Description of Our Partnership Agreement,&#148; insofar as they constitute descriptions of agreements or refer to statements of law or legal conclusions, are
accurate in all material respects, and the Units, the Common Units and the Incentive Distribution Rights conform in all material respects to the descriptions thereof contained in the Registration Statement, the Pricing Disclosure Package and the
Prospectus. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(xiii) The opinion of Vinson&nbsp;&amp; Elkins L.L.P. that is filed as Exhibit 8.1 to the Registration Statement
is confirmed and the Underwriters may rely upon such opinion as if it were addressed to them. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(xiv) The Registration
Statement became effective under the Securities Act upon its filing on October&nbsp;14, 2009; to the knowledge of such counsel, no stop order suspending the effectiveness of the Registration Statement has been issued and no proceedings for that
purpose have been instituted or threatened by the Commission; and any required filing of the Prospectus pursuant to Rule 424(b) has been made in the manner and within the time period required by such Rule. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(xv) The Registration Statement, the Pricing Disclosure Package and the Prospectus (except for the financial statements and the notes and
the schedules thereto and the other financial information included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package or the Prospectus, as to which such counsel need not express an opinion) comply as to form
in all material respects with the requirements of the Securities Act and the Exchange Act and the rules and regulations promulgated thereunder. </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(xvi) None of the Plains Entities is now, and after sale of the Units to be sold by the
Partnership hereunder and application of the net proceeds from such sale as described in the Pricing Disclosure Package and the Prospectus under the caption &#147;Use of Proceeds,&#148; none of the Plains Entities will be, an &#147;investment
company&#148; as such term is defined in the Investment Company Act. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">In addition, such counsel shall state that they have
participated in conferences with officers and other representatives of GP LLC and the Partnership, representatives of the independent public accountants of GP LLC and the Partnership and the Underwriters&#146; representatives and counsel, at which
the contents of the Registration Statement, the Pricing Disclosure Package and the Prospectus and related matters were discussed, and although such counsel has not independently verified, is not passing on, and is not assuming any responsibility for
the accuracy, completeness or fairness of the statements contained in, the Registration Statement, the Pricing Disclosure Package and the Prospectus (except to the extent specified in opinion (xii above)), on the basis of the foregoing, no facts
have come to the attention of such counsel that lead them to believe that: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(A) the Registration Statement, as of the most
recent Effective Date, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading; </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(B) the Pricing Disclosure Package, as of the Applicable Time, included an untrue statement of a material fact or omitted to state a
material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; or </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(C) the Prospectus, as of its date and as of each applicable Delivery Date, included or includes an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to
make the statements therein, in the light of the circumstances under which they were made, not misleading, </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">it being understood that such
counsel need not express any statement or belief with respect to (i)&nbsp;the financial statements and related schedules, including the notes and schedules thereto and the auditor&#146;s report thereon, included or incorporated by reference in the
Registration Statement, the Pricing Disclosure Package and the Prospectus or (ii)&nbsp;any other financial information included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">In rendering such opinion, such counsel may (A)&nbsp;rely in respect of matters of fact upon certificates of officers and
employees of GP LLC and the Partnership, to the extent they deem appropriate, and information obtained from public officials, (B)&nbsp;assume that all documents submitted to them as originals are authentic, that all copies submitted to them conform
to the originals thereof, and that the signatures on all documents examined by them are genuine, (C)&nbsp;state that their opinion is limited to federal laws, the Delaware LP Act, the Delaware LLC Act,
</FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">27 </FONT></P>



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the DGCL and the laws of the State of Texas and (D)&nbsp;state that they express no opinion with respect to (i)&nbsp;any permits to own or operate any real or personal property or (ii)&nbsp;state
or local taxes or tax statutes to which any of the limited partners of the Partnership or any of the Plains Entities may be subject. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(d) The Representatives shall have received on each applicable Delivery Date an opinion of Tim Moore, general counsel for GP LLC, dated the applicable Delivery Date and addressed to the Underwriters, to
the effect that: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(i) None of the offering, issuance and sale by the Partnership of the Units, the execution, delivery and
performance by the Partnership of this Agreement, the consummation of the transactions contemplated by this Agreement (A)&nbsp;constitutes or will constitute a breach or violation of, a change of control or a default (or an event which, with notice
or lapse of time or both, would constitute such an event) under any bond, debenture, note or any other evidence of indebtedness, indenture or any other material agreement or instrument known to such counsel to which the Partnership, any of the GP
Entities or any of the Material Subsidiaries is a party or by which any one of them may be bound (other than any other document or agreement filed as an exhibit to the Registration Statement or an Incorporated Document, the Plains AAP Facility or
the PNG Facility) or (B)&nbsp;violates or will violate any statute, law or regulation or any order, judgment, decree or injunction known to such counsel of any court or governmental agency or body directed to the Partnership, any of the GP Entities
or any of the Material Subsidiaries or any of their respective properties in a proceeding to which any of them is a party, which would, in the case of either (A)&nbsp;or (B), reasonably be expected to have a Material Adverse Effect or materially
impair the ability of the Partnership to consummate the transactions contemplated by this Agreement. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ii) To the knowledge of
such counsel, there is no legal or governmental proceeding pending or threatened to which the Partnership or any of the Subsidiaries is a party or to which any of their respective properties is subject that is required to be disclosed in the Pricing
Disclosure Package or the Prospectus and is not so disclosed. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(iii) To the knowledge of such counsel, except as described in
the Pricing Disclosure Package and the Prospectus or as have been issued pursuant to compensation plans adopted or administered by the General Partner, there are no outstanding options or warrants to purchase any Common Units or other equity
interests in the Partnership. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(iv) To the knowledge of such counsel, there are no agreements, contracts or other documents to
which the Partnership or any of the Subsidiaries is a party or are bound that are required to be described in the Registration Statement, the Pricing Disclosure Package or the Prospectus or to be filed as exhibits to the Registration Statement or to
the Incorporated Documents that are not described or filed as required. </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">28 </FONT></P>



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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">In addition, such counsel shall state that he has participated in conferences with officers
and other representatives of GP LLC and the Partnership, representatives of the independent public accountants of GP LLC and the Partnership and the Underwriters&#146; representatives and counsel, at which the contents of the Registration Statement,
the Pricing Disclosure Package and the Prospectus and related matters were discussed, and although such counsel has not independently verified, is not passing on, and is not assuming any responsibility for the accuracy, completeness or fairness of
the statements contained in, the Registration Statement, the Pricing Disclosure Package and the Prospectus, on the basis of the foregoing, no facts have come to the attention of such counsel that lead him to believe that: </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(A) the Registration Statement, as of the most recent Effective Date, contained an untrue statement of a material fact or omitted to
state a material fact required to be stated therein or necessary to make the statements therein not misleading; </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(B) the
Pricing Disclosure Package, as of the Applicable Time, included an untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were
made, not misleading; or </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(C) the Prospectus, as of its date and as of each applicable Delivery Date, included or includes an
untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">it being understood that such counsel need not express any statement or belief with respect to (i)&nbsp;the financial statements and related schedules,
including the notes and schedules thereto and the auditor&#146;s report thereon, included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus or (ii)&nbsp;any other financial or statistical
information included or incorporated by reference in the Registration Statement, the Pricing Disclosure Package and the Prospectus. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">In rendering such opinion, such counsel may (A)&nbsp;rely in respect of matters of fact upon certificates of officers and employees of GP LLC and the Partnership, to the extent he deems appropriate, and
upon information obtained from public officials, (B)&nbsp;assume that all documents submitted to him as originals are authentic, that all copies submitted to him conform to the originals thereof, and that the signatures on all documents examined by
him are genuine, (C)&nbsp;state that such opinions are limited to federal laws and the Delaware LP Act, the Delaware LLC Act, the DGCL and the laws of the State of Texas and (D)&nbsp;state that he expresses no opinion with respect to either federal
or state securities laws in clause (B)&nbsp;of paragraph (i)&nbsp;above or state or local taxes or tax statutes. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(e) The
Representatives shall have received on each applicable Delivery Date, an opinion of Bennett Jones LLP with respect to the Province of Alberta and the federal laws of Canada, dated the Closing Date and addressed to the Underwriters, to the effect
that: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(i) Plains Midstream Canada ULC, an Alberta unlimited liability company (&#147;<B>Plains Midstream Canada</B>&#148;)
has been duly amalgamated and is validly </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">29 </FONT></P>



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existing in good standing as an unlimited liability company under the laws of Alberta with all necessary corporate power and authority to own or lease its properties in all material respects as
described in the Pricing Disclosure Package and the Prospectus, and to conduct its business as currently conducted and as proposed in the Pricing Disclosure Package and the Prospectus to be conducted. Plains Midstream Canada is duly registered
extraprovincially for the transaction of business and is in good standing under the laws of the provinces of British Columbia, Manitoba, Quebec, New Brunswick, Nova Scotia, Ontario and Saskatchewan. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ii) Plains Midstream Canada is the registered holder of 100% of the issued and outstanding capital stock of Aurora Pipeline Company
Ltd., a corporation incorporated under the laws of Canada (&#147;<B>Aurora</B>&#148;); such share capital has been duly authorized and validly issued in accordance with the Aurora Memorandum and Articles of Association, as fully paid and
nonassessable shares (except as such nonassessability may be affected by the laws of the Province of Alberta). </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(iii) Plains
Marketing is the registered holder of 100% of the issued and outstanding preferred shares of Plains Midstream Canada, and Plains Midstream Luxembourg, S.a.r.l. is the registered holder of 100% of the issued and outstanding common shares of Plains
Midstream Canada; such share capital has been duly authorized and validly issued in accordance with the Articles of Amalgamation of Plains Midstream Canada, as fully paid and nonassessable shares (except as such nonassessability may be affected by
the laws of the Province of Alberta). </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(iv) No permit, consent, approval, authorization, order, registration, filing or
qualification of or with any court, governmental agency or body of the federal government of Canada or the Province of Alberta is required for the offering, issuance and sale by the Partnership of the Units. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(v) None of the offering, issuance and sale by the Partnership of the Units, the execution, delivery and performance of this Agreement by
the Partnership or the consummation of the transactions contemplated hereby constitutes or will constitute a violation of the certificate or Articles of Amalgamation, bylaws or other organizational documents of Plains Midstream Canada, or any
statute, law or regulation of Canada or the Province of Alberta or, to the knowledge of such counsel, any order, judgment, decree or injunction of any court or governmental agency or body of Canada or the Province of Alberta directed to Plains
Midstream Canada or its properties in a proceeding to which Plains Midstream Canada or its property is a party. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(ix) To the
knowledge of such counsel, Plains Midstream Canada has such Permits issued by the appropriate federal, provincial or regulatory authorities as are necessary to own or lease its properties and to conduct its business as currently conducted and as
proposed in the Pricing Disclosure Package and the Prospectus to be conducted, subject to such qualifications as may be set forth in </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">30 </FONT></P>



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the Pricing Disclosure Package and the Prospectus, and except for such Permits which, if not obtained would not reasonably be expected to, individually or in the aggregate, materially adversely
affect the operations conducted by Plains Midstream Canada. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">In rendering such opinion, such counsel may (A)&nbsp;rely in
respect of matters of fact upon certificates of officers and employees of GP LLC and the Partnership, to the extent they deem proper, and upon information obtained from public officials, (B)&nbsp;assume that all documents submitted to them as
originals are authentic, that all copies submitted to them conform to the originals thereof, and that the signatures on all documents examined by them are genuine, (C)&nbsp;state that such opinions are limited to federal laws of Canada and the laws
of the Province of Alberta, excepting therefrom municipal and local ordinances and regulations and (D)&nbsp;state that they express no opinion with respect to state or local taxes or tax statutes to which any of the limited partners of the
Partnership or the Plains Entities may be subject. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">In rendering such opinion, such counsel shall state that
(A)&nbsp;Vinson&nbsp;&amp; Elkins L.L.P. is thereby authorized to rely upon such opinion letter in connection with the transactions contemplated by this Agreement as if such opinion letter were addressed and delivered to them on the date thereof and
(B)&nbsp;subject to the foregoing, such opinion letter may be relied upon only by the Underwriters and their counsel in connection with the transactions contemplated by this Agreement and no other use or distribution of such opinion letter may be
made without such counsel&#146;s prior written consent. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(f) The Representatives shall have received on each applicable
Delivery Date an opinion of Baker Botts L.L.P., counsel for the Underwriters, dated the applicable Delivery Date and addressed to the Underwriters, with respect to the offering, issuance and sale of the Units, the Registration Statement, the Pricing
Disclosure Package, the Prospectus (together with any amendment or supplement thereto) and other related matters the Underwriters may reasonably require. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(g) At the time of the execution of this Agreement, the Representatives shall have received from PricewaterhouseCoopers LLP, independent public accountants, letters dated such date, in form and substance
satisfactory to the Representatives, together with signed or reproduced copies of such letters for each of the other Underwriters, containing statements and information of the type ordinarily included in accountants&#146; &#147;comfort letters&#148;
to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Pricing Disclosure Package and the Prospectus; provided that the cut-off date for the procedures performed by
such accountants and described in such letters shall be a date not more than five days prior to the date of such letter. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(h)
On each applicable the Delivery Date, the Representatives shall have received from PricewaterhouseCoopers LLP a letter, dated as of each such Delivery Date, to the effect that they reaffirm the statements made in the letter furnished pursuant to
paragraph (g)&nbsp;of this Section&nbsp;7, except that the date referred to in the proviso in Section&nbsp;7(g) hereof shall be a date not more than three business days prior to each such Delivery Date. </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(i) The Partnership shall have furnished to the Representatives at each applicable Delivery
Date a certificate of the Partnership, signed on behalf of the Partnership by the President or any Vice President and the Chief Financial Officer of GP LLC, dated the applicable Delivery Date, to the effect that the signers of such certificate have
examined the Registration Statement, the Pricing Disclosure Package, the Prospectus and any amendment or supplement thereto, and this Agreement and that: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">(A) the representations and warranties of the Partnership in this Agreement are true and correct on and as of the applicable Delivery Date with the same effect as if made on the applicable Delivery Date
and the Partnership has complied in all material respects with all the agreements and satisfied all the conditions on its part to be performed or satisfied at or prior to the applicable Delivery Date; </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(B) no stop order suspending the effectiveness of the Registration Statement or any notice objecting to its use has been issued and no
proceedings for that purpose have been instituted or, to the Partnership&#146;s knowledge, threatened; and </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(C) (i) the
Registration Statement, as of the Effective Date, (ii)&nbsp;the Prospectus, as of its date and on the applicable Delivery Date, and (iii)&nbsp;the Pricing Disclosure Package, as of the Applicable Time, did not and do not contain any untrue statement
of a material fact and did not and do not omit to state a material fact required to be stated therein or necessary to make the statement therein (except in the case of the Registration Statement, in the light of the circumstances under which they
were made) not misleading. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(j) The NYSE shall have approved the Units for listing, subject only to official notice of
issuance and evidence of satisfactory distribution. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(k) On or prior to the date hereof, the Partnership shall have furnished
to the Underwriters a letter substantially in the form of <U>Exhibit B</U> hereto from (i)&nbsp;each officer (as defined in Rule 16a-1(f) of the rules and regulations under the Exchange Act) of GP LLC and (ii)&nbsp;each director of GP LLC.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(l) At the time of the execution of this Agreement, the Representatives shall have received from the Partnership a
certificate substantially in the form of <U>Exhibit C</U> hereto and signed by the chief financial officer of the General Partner. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">All such opinions, certificates, letters and other documents referred to in this Section&nbsp;7 will be in compliance with the provisions hereof only if they are reasonably satisfactory in form and
substance to the Representatives and counsel for the Underwriters. The Partnership shall furnish to the Underwriters conformed copies of such opinions, certificates, letters and other documents in such number as they shall reasonably request.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The several obligations of the Underwriters to purchase Option Units hereunder are subject to the satisfaction on and as of
any Option Units Delivery Date of the conditions set forth in this Section&nbsp;7, except that, if any Option Units Delivery Date is other than the Initial Delivery Date, (i)&nbsp;the certificates, opinions and letters referred to in paragraphs
(c)&nbsp;through (f), (h)&nbsp;and (i)&nbsp;shall be dated the Option Units Delivery Date in question, (ii)&nbsp;the opinions called for by paragraphs (c), (d), (e)&nbsp;and (f), as applicable, shall be revised to reflect the sale of Option Units
and (iii)&nbsp;any references in Section&nbsp;7 to the Initial Delivery Date shall be deemed to be such Option Units Delivery Date. </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">If any of the conditions specified in this Section&nbsp;7 shall not have been fulfilled in
all material respects when and as provided in this Agreement, or if any of the opinions and certificates mentioned above or elsewhere in this Agreement shall not be in all material respects reasonably satisfactory in form and substance to the
Underwriters and counsel for the Underwriters, this Agreement and all obligations of the Underwriters hereunder may be cancelled at, or at any time prior to, the applicable Delivery Date by the Underwriters. Notice of such cancellation shall be
given to the Partnership in writing or by telephone or facsimile confirmed in writing. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">8. <U>Expenses</U>. The Partnership
agrees to pay the following costs and expenses and all other costs and expenses incident to the performance by it of its obligations hereunder: (i)&nbsp;the preparation, printing or reproduction, and filing with the Commission of the Registration
Statement (including financial statements and exhibits thereto), any Preliminary Prospectus, the Prospectus, any Issuer Free Writing Prospectus and each amendment or supplement to any of them; (ii)&nbsp;the printing (or reproduction) and delivery
(including postage, air freight charges and charges for counting and packaging) of such copies of the Registration Statement, any Preliminary Prospectus, any Issuer Free Writing Prospectus, the Prospectus, the Incorporated Documents and all
amendments or supplements to any of them as may be reasonably requested for use in connection with the offering and sale of the Units; (iii)&nbsp;the preparation, printing, authentication, issuance and delivery of certificates for the Units,
including any stamp taxes in connection with the original issuance and sale of the Units; (iv)&nbsp;the printing (or reproduction) and delivery of this Agreement, the preliminary and supplemental Blue Sky Memoranda, and all other agreements or
documents printed (or reproduced) and delivered in connection with the offering of the Units; (v)&nbsp;the registration of the Common Units under the Exchange Act and the listing of the Units on the NYSE and any applicable listing or other similar
fees; (vi)&nbsp;the registration or qualification of the Units for offer and sale under the securities or Blue Sky laws of the several states as provided in Section&nbsp;5(f) hereof (including the reasonable fees, expenses and disbursements of
counsel for the Underwriters relating to the preparation, printing or reproduction, and delivery of the preliminary and supplemental Blue Sky Memoranda and such registration and qualification); (vii)&nbsp;any filing fees in connection with any
filings required to be made with FINRA; (viii)&nbsp;the transportation and other expenses incurred by or on behalf of officers and employees of GP LLC or the Partnership in connection with presentations to prospective purchasers of the Units; and
(ix)&nbsp;the fees and expenses of the Partnership&#146;s accountants and the fees and expenses of counsel (including local and special counsel) for the Partnership. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">It is understood, however, that except as otherwise provided in this Section&nbsp;8 or Section&nbsp;5(i) hereof, the Underwriters will pay all of their own costs and expenses, including the fees of their
counsel, transfer taxes on any resale of the Units by any Underwriter, any advertising expenses connected with any offers they may make and the transportation and other expenses incurred by the Underwriters on their own behalf in connection with
presentations to prospective purchasers of the Units. </FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">9. <U>Default by an Underwriter</U>. If any one or more of the Underwriters shall fail or
refuse to purchase Units that it or they are obligated to purchase hereunder on the Initial Delivery Date, and the aggregate number of Units that such defaulting Underwriter or Underwriters are obligated but fail or refuse to purchase is not more
than one-tenth of the aggregate number of the Units that the Underwriters are obligated to purchase on the Initial Delivery Date, each non-defaulting Underwriter shall be obligated, severally, in the proportion that the number of Firm Units set
forth opposite its name in <U>Schedule&nbsp;I</U> hereto bears to the aggregate number of Firm Units set forth opposite the names of all non-defaulting Underwriters or in such other proportion as the Representatives may specify in accordance with
the Agreement Among Underwriters of Barclays Capital Inc. to purchase the Units that such defaulting Underwriter or Underwriters are obligated, but fail or refuse, to purchase. If any one or more of the Underwriters shall fail or refuse to purchase
Units that it or they are obligated to purchase on the Initial Delivery Date and the aggregate number of Units with respect to which such default occurs is more than one-tenth of the aggregate number of Units that the Underwriters are obligated to
purchase on the Initial Delivery Date and arrangements satisfactory to the Representatives and the Partnership for the purchase of such Units by one or more non-defaulting Underwriters or other party or parties approved by the Representatives and
the Partnership are not made within five business days after such default, this Agreement will terminate without liability on the part of any party hereto (other than the defaulting Underwriter). In any such case that does not result in termination
of this Agreement, either the Representatives or the Partnership shall have the right to postpone the Initial Delivery Date, but in no event for longer than seven days, in order that the required changes, if any, in the Registration Statement and
the Prospectus or any other documents or arrangements may be effected. If any one or more of the Underwriters shall fail or refuse to purchase Option Units that it or they are obligated to purchase hereunder on the Option Units Delivery Date, each
non-defaulting Underwriter shall be obligated, severally, in the proportion that the number of Firm Units set forth opposite its name in <U>Schedule&nbsp;I</U> hereto bears to the aggregate number of Firm Units set forth opposite the names of all
non-defaulting Underwriters or in such other proportion as the Representatives may specify in accordance with the Agreement Among Underwriters of Barclays Capital Inc., to purchase the Option Units that such defaulting Underwriter or Underwriters
are obligated, but fail or refuse, to purchase. Any action taken under this paragraph shall not relieve any defaulting Underwriter from liability in respect of any such default of any such Underwriter under this Agreement. The term
&#147;Underwriter&#148; as used in this Agreement includes, for all purposes of this Agreement, any party not listed in <U>Schedule&nbsp;I</U> hereto who, with the Representatives&#146; approval and the approval of the Partnership, purchases Units
that a defaulting Underwriter is obligated, but fails or refuses, to purchase. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">Any notice under this Section&nbsp;9 may be
given by telegram, telecopy or telephone but shall be subsequently confirmed by letter. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">10. <U>Termination of Agreement</U>.
This Agreement shall be subject to termination in the Representatives&#146; absolute discretion, without liability on the part of any Underwriters to the Partnership, by notice to the Partnership, if prior to the Initial Delivery Date or any Option
Units Delivery Date (if different from the Initial Delivery Date and then only as to the Option Units), as the case may be, (i)&nbsp;trading in the Common Units shall have been suspended by the Commission or the NYSE or trading in securities
generally on the New York Stock Exchange, the American Stock Exchange or the Nasdaq National Market shall have been </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">34 </FONT></P>



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 <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">
suspended or limited or minimum prices shall have been established; (ii)&nbsp;a banking moratorium shall have been declared either by federal or New York or Texas state authorities or a material
disruption in commercial banking or securities settlement or clearance services in the United States, shall have occurred; or (iii)&nbsp;there shall have occurred any outbreak or escalation of hostilities or acts of terrorism, declaration by the
United States of a national emergency or war, or other calamity or crisis or any change in financial, political or economic conditions in the United States or elsewhere, the effect of which on financial markets is such as to make it, in the sole
judgment of the Underwriters, impractical or inadvisable to proceed with the offering or delivery of the Units as contemplated by the Prospectus (exclusive of any amendment or supplement thereto). Notice of such termination may be given to the
Partnership by telegram, telecopy or telephone and shall be subsequently confirmed by letter. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">11. <U>Notice; Successors</U>.
Except as otherwise provided in Sections 5, 9 and 10 hereof, all communications hereunder will be in writing and effective only on receipt, and, if sent to the Underwriters, will be mailed, delivered or telefaxed to the Representatives c/o Barclays
Capital Inc., Attention: Syndicate Registration, 745 Seventh Avenue, New York, New York 10019 (fax: 646-834-8133); or, if sent to the Partnership, will be mailed, delivered or telefaxed to (713)&nbsp;646-4313 and confirmed to it at 333 Clay St.,
Suite 1600, Houston, Texas 77002, Attention: General Counsel. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">This Agreement has been and is made solely for the benefit of
the several Underwriters and their directors, officers, employees, agents and other controlling persons referred to in Section&nbsp;6 hereof and the Partnership and GP LLC&#146;s directors and the officers who sign the Registration Statement, and
other controlling persons referred to in Section&nbsp;6 hereof, and their respective successors and assigns, to the extent provided herein, and no other person shall acquire or have any right under or by virtue of this Agreement. Neither the term
&#147;successor&#148; nor the term &#147;successors and assigns&#148; as used in this Agreement shall include a purchaser from any Underwriter of any of the Units in his status as such purchaser. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">12. <U>Information Furnished by the Underwriters</U>. The Partnership acknowledges that the following statements set forth in the most
recent Preliminary Prospectus and the Prospectus constitute the only information furnished by or on behalf of the Underwriters through the Representatives as such information is referred to in Sections 1(c), 1(d), 1(f), 1(g), 5(q), 6(a) and 6(c)
hereof: (A)&nbsp;the names of the Underwriters, (B)&nbsp;the table under the first paragraph under the heading &#147;Underwriting,&#148; (C)&nbsp;the sentence in the third paragraph under the heading &#147;Underwriting&#148; related to concessions
and (D)&nbsp;the paragraphs under the heading &#147;Underwriting&#151;Price Stabilizations, Short Positions and Penalty Bids.&#148; </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">13. <U>Research Analyst Independence</U>. The Partnership acknowledges that the Underwriters&#146; research analysts and research departments are required to be independent from their respective
investment banking divisions and are subject to certain regulations and internal policies, and that such Underwriters&#146; research analysts may hold views and make statements or investment recommendations and/or publish research reports with
respect to the Partnership and/or the offering that differ from the views of their respective investment banking divisions. The Partnership hereby waives and releases, to the fullest extent permitted by law, any claims that the Partnership may have
against the Underwriters with respect to any conflict of interest that may arise from the fact that the views expressed by their independent research analysts and </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">35 </FONT></P>



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 <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">
research departments may be different from or inconsistent with the views or advice communicated to the Partnership by such Underwriters&#146; investment banking divisions. The Partnership
acknowledges that each of the Underwriters is a full service securities firm and as such from time to time, subject to applicable securities laws, may effect transactions for its own account or the account of its customers and hold long or short
positions in debt or equity securities of the companies that may be the subject of the transactions contemplated by this Agreement. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">14. <U>Integration</U>. This Agreement supersedes all prior agreements and understandings (whether written or oral) between the Partnership and the Underwriters, or any of them, with respect to the
subject matter hereof. </FONT></P> <P STYLE="margin-top:18px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">15. <U>Headings</U>. The Section&nbsp;headings used herein are for convenience only and shall not
affect the construction hereof. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">16. <U>Effective Date of Agreement</U>. This Agreement shall become effective upon the
execution and delivery hereof by the parties hereto. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">17. <U>No Fiduciary Duty</U>. The Partnership acknowledges and agrees
that in connection with this offering and sale of the Units or any other services the Underwriters may be deemed to be providing hereunder, notwithstanding any preexisting relationship, advisory or otherwise, between the parties or any oral
representations or assurances previously or subsequently made by the Underwriters: (i)&nbsp;no fiduciary or agency relationship between the Partnership and any other person, on the one hand, and the Underwriters, on the other hand, exists;
(ii)&nbsp;the Underwriters are not acting as advisors, expert or otherwise, to the Partnership, including, without limitation, with respect to the determination of the public offering price of the Units, and such relationship between the
Partnership, on the one hand, and the Underwriters, on the other, is entirely and solely commercial, based on arms-length negotiations; (iii)&nbsp;any duties and obligations that the Underwriters may have to the Partnership shall be limited to those
duties and obligations specifically stated herein; and (iv)&nbsp;the Underwriters and their respective affiliates may have interests that differ from those of the Partnership. The Partnership hereby waives any claims that it may have against the
Underwriters with respect to any breach of fiduciary duty in connection with this offering. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">18. <U>Applicable Law;
Counterparts</U>. This Agreement shall be governed by and construed in accordance with the laws of the State of New York applicable to contracts made and to be performed within the State of New York. This Agreement may be signed in various
counterparts that together constitute one and the same instrument. If signed in counterparts, this Agreement shall not become effective unless at least one counterpart hereof shall have been executed and delivered on behalf of each party hereto.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">[<I>Signature Pages Follow</I>] </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">36 </FONT></P>



<p Style='page-break-before:always'>
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:8%"><FONT STYLE="font-family:Times New Roman" SIZE="2">Please confirm that the foregoing correctly sets forth the agreement among the Partnership
and the Underwriters. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE">


<TR>
<TD WIDTH="6%"></TD>
<TD VALIGN="bottom" WIDTH="2%"></TD>
<TD WIDTH="92%"></TD></TR>


<TR>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">Very truly yours,</FONT></TD></TR>
<TR>
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>PLAINS ALL AMERICAN PIPELINE, L.P.</B></FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">PAA GP LLC,</FONT></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">its General Partner</FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">PLAINS AAP, L.P.,</FONT></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">its Sole Member</FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">PLAINS ALL AMERICAN GP LLC,</FONT></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">its General Partner</FONT></TD></TR>
</TABLE></DIV> <DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE">


<TR>
<TD WIDTH="9%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="6%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="83%"></TD></TR>


<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ A. Patrick Diamond</FONT></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name: A. Patrick Diamond</FONT></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title: &nbsp;&nbsp;Vice President</FONT></TD></TR>
</TABLE></DIV> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><I>Signature Page to Underwriting Agreement </I></FONT></P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">The foregoing Agreement is hereby confirmed and accepted as of the date first above written. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Barclays Capital Inc. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Merrill Lynch, Pierce,
Fenner&nbsp;&amp; Smith Incorporated </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Citigroup Global Markets Inc. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">J.P. Morgan Securities LLC </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">UBS Securities LLC </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Wells Fargo Securities, LLC </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">As Representatives
of the several underwriters </FONT></P> <P STYLE="font-size:4px;margin-top:0px;margin-bottom:0px">&nbsp;</P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE">


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<TD WIDTH="2%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="2%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="41%"></TD>
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<TD WIDTH="4%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="2%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="2%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="41%"></TD></TR>


<TR>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">Barclays Capital Inc.</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated</FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="border-bottom:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ Victoria Hale</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="border-bottom:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ Mark Sooby</FONT></P></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name: Victoria Hale</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:
Vice President</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name: Mark Sooby</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:
Managing Director</FONT></P></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="4"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="4"></TD></TR>
<TR>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">Citigroup Global Markets Inc.</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">J.P. Morgan Securities LLC</FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="border-bottom:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ Matthew Hartman</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="border-bottom:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ Geoffrey Paul</FONT></P></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name: Matthew Hartman</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:
Vice President</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name: Geoffrey Paul</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:
Executive Director</FONT></P></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="4"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="4"></TD></TR>
<TR>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">UBS Securities LLC</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">Wells Fargo Securities, LLC</FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="border-bottom:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ Rob Pierce</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="border-bottom:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ David Herman</FONT></P></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name: Rob Pierce</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:
Managing Director</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name: David Herman</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:
Director</FONT></P></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="border-bottom:1px solid #000000"> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ Bimal Amin</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name: Bimal Amin</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:
Associate Director</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top"></TD></TR>
</TABLE> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><I>Signature Page to Underwriting Agreement </I></FONT></P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>SCHEDULE I </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Plains All American Pipeline, L.P. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="68%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE" ALIGN="center">


<TR>
<TD WIDTH="86%"></TD>
<TD VALIGN="bottom" WIDTH="4%"></TD>
<TD></TD>
<TD></TD>
<TD></TD></TR>
<TR>
<TD VALIGN="bottom" NOWRAP> <P STYLE="border-bottom:1px solid #000000;width:43pt"><FONT STYLE="font-family:Times New Roman" SIZE="1"><B>Underwriter</B></FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" COLSPAN="2" ALIGN="center" STYLE="border-bottom:1px solid #000000"><FONT STYLE="font-family:Times New Roman" SIZE="1"><B>Number of<BR>Firm Units</B></FONT><br><FONT STYLE="font-family:Times New Roman" SIZE="1"><B>to
be<BR>Purchased</B></FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD></TR>


<TR BGCOLOR="#cceeff">
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Barclays Capital Inc.</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">700,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">700,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR BGCOLOR="#cceeff">
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Citigroup Global Markets Inc.</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">700,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">J.P. Morgan Securities LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">700,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR BGCOLOR="#cceeff">
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">UBS Securities LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">700,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Wells Fargo Securities, LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">425,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR BGCOLOR="#cceeff">
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Raymond James&nbsp;&amp; Associates, Inc.</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">350,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">RBC Capital Markets, LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">350,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR BGCOLOR="#cceeff">
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Oppenheimer&nbsp;&amp; Co. Inc.</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">100,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Robert W. Baird&nbsp;&amp; Co. Incorporated</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">100,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR BGCOLOR="#cceeff">
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Stifel, Nicolaus&nbsp;&amp; Company, Incorporated</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">100,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Global Hunter Securities, LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">75,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR STYLE="font-size:1px">
<TD VALIGN="bottom"></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom"> <P STYLE="border-top:1px solid #000000">&nbsp;</P></TD>
<TD VALIGN="bottom"> <P STYLE="border-top:1px solid #000000">&nbsp;</P></TD>
<TD>&nbsp;</TD></TR>
<TR BGCOLOR="#cceeff">
<TD VALIGN="top"> <P STYLE="margin-left:3.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Total</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2">5,000,000</FONT></TD>
<TD NOWRAP VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">&nbsp;&nbsp;</FONT></TD></TR>
<TR STYLE="font-size:1px">
<TD VALIGN="bottom"></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom"> <P STYLE="border-top:3px double #000000">&nbsp;</P></TD>
<TD VALIGN="bottom"> <P STYLE="border-top:3px double #000000">&nbsp;</P></TD>
<TD>&nbsp;</TD></TR>
</TABLE> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><I>Schedule I to Underwriting Agreement </I></FONT></P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>SCHEDULE II </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2"><B>Additional Pricing Disclosure Package </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Pricing Information: </B></FONT></P>
<P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE" ALIGN="center">


<TR>
<TD WIDTH="16%"></TD>
<TD VALIGN="bottom" WIDTH="4%"></TD>
<TD WIDTH="80%"></TD></TR>


<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Number of Units:</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">5,000,000 Firm Units or, if the Underwriters exercise in full their option to purchase additional Units granted in Section&nbsp;2 hereof, 750,000 Units</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top" NOWRAP> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Public offering price</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:1px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">for the Units:</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">$80.03 per unit</FONT></TD></TR>
</TABLE> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><I>Schedule II to Underwriting Agreement </I></FONT></P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>SCHEDULE III </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2"><B>Material Subsidiaries </B></FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Marketing, L.P. </FONT></P>
<P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Pipeline, L.P. </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Pacific Pipeline System
LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Products Terminals LLC </FONT></P>
<P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Midstream Canada ULC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains West Coast
Terminals LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Rocky Mountain Pipeline System LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Pine Prairie Energy Center, LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">SG Resources Mississippi LLC </FONT></P>
<P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains LPG Services LP </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><I>Schedule III to Underwriting Agreement </I></FONT></P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>SCHEDULE IV </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2"><B>Domestic Subsidiaries </B></FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Marketing, L.P. </FONT></P>
<P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Pipeline, L.P. </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Pacific Pipeline System
LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Products Terminals LLC </FONT></P>
<P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains West Coast Terminals LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Rocky Mountain
Pipeline System LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Pine Prairie Energy Center, LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">SG Resources Mississippi LLC </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains LPG Services LP </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><I>Schedule IV to Underwriting Agreement </I></FONT></P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>EXHIBIT A </B></FONT></P>
<P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TR>
<TD WIDTH="51%"></TD>
<TD VALIGN="bottom" WIDTH="2%"></TD>
<TD WIDTH="47%"></TD></TR>
<TR>
<TD VALIGN="bottom" NOWRAP> <P STYLE="border-bottom:1px solid #000000;width:19pt"><FONT STYLE="font-family:Times New Roman" SIZE="1">Entity</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="border-bottom:1px solid #000000;width:139pt"><FONT STYLE="font-family:Times New Roman" SIZE="1">Jurisdiction in which registered or qualified</FONT></P></TD></TR>


<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains All American Pipeline, L.P.</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Texas</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">PAA GP LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Texas</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains AAP, L.P.</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Texas</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains All American GP LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">California, Illinois, Louisiana, Oklahoma, Texas</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Marketing, L.P.</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">California, Illinois, Louisiana, Oklahoma</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Pipeline, L.P.</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">California, Illinois, Louisiana, Oklahoma</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Products Terminals LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">California</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains Midstream Canada ULC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">British Columbia, Manitoba, Quebec, New Brunswick, Nova Scotia, Ontario and Saskatchewan</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Pacific Pipeline System LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">California</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains West Coast Terminals LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">California</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Rocky Mountain Pipeline System LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Utah</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Pine Prairie Energy Center, LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Louisiana</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">SG Resources Mississippi LLC</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Mississippi</FONT></TD></TR>
<TR>
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains LPG Services LP</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">California, Illinois, Oklahoma, Texas</FONT></TD></TR>
</TABLE>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">Exhibit A-1
</FONT></P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="3"><B>EXHIBIT B </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2">March&nbsp;6, 2012 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains All American Pipeline, L.P. </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><U>Public Offering of Common Units </U></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Barclays Capital Inc. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Citigroup Global Markets Inc. </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">J.P. Morgan Securities LLC </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Merrill Lynch,
Pierce, Fenner&nbsp;&amp; Smith Incorporated </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">UBS Securities LLC </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Wells Fargo Securities, LLC </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">c/o Barclays Capital Inc. </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">745 Seventh Avenue </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">New York, New York 10019
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">As Representatives of the several underwriters </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Ladies and Gentlemen: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">This letter is being delivered to you in connection with
the proposed Underwriting Agreement (the &#147;Underwriting Agreement&#148;) among Plains All American Pipeline, L.P., a Delaware limited partnership (the &#147;Partnership&#148;) and Barclays Capital Inc., Citigroup Global Markets Inc., J.P. Morgan
Securities LLC, Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated UBS Securities LLC and Wells Fargo Securities, LLC and any other party thereto named therein as an underwriter (the &#147;Underwriters&#148;) relating to an underwritten
public offering of common units representing limited partner interests of the Partnership. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">To induce you and the other underwriters to enter
into the Underwriting Agreement, the undersigned agrees that, except for transfers of Common Units (as defined in the Underwriting Agreement) in connection with (i)&nbsp;sales to pay tax liabilities associated with the vesting of Restricted Unit or
Phantom Unit awards under the Plains All American GP LLC 1998, 2005 or PPX Successor Long-Term Incentive Plans or (ii)&nbsp;gifts or charitable donations, the undersigned will not offer, sell, contract to sell, pledge or otherwise dispose of, or
enter into any transaction which is designed to, or might reasonably be expected to, result in the disposition (whether by actual disposition or effective economic disposition due to cash settlement or otherwise) by the undersigned or any affiliate
of the undersigned or any person in privity with the undersigned or any affiliate of the undersigned, directly or indirectly, including the filing (or participation in the filing) of a registration statement with the Securities and Exchange
Commission in respect of, or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section&nbsp;16 of the Securities Exchange Act of 1934, as amended, and the rules and regulations
of the Securities and Exchange Commission promulgated thereunder with respect to, any Common Units or any securities that are convertible into, or exercisable or exchangeable for, or that represent the right to receive, Common Units or any
securities that are </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">Exhibit B-1
</FONT></P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">
senior to or <I>pari passu</I> with Common Units, or publicly announce an intention to effect any such transaction, for a period of 45 days after the date of the Prospectus (as defined in the
Underwriting Agreement) (the &#147;Lock-Up Period&#148;) without the prior written consent of Barclays Capital Inc. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">If for
any reason the Underwriting Agreement is terminated before the applicable Delivery Date (as defined in the Underwriting Agreement), the agreement set forth above shall likewise be terminated. </FONT></P>
<P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE">


<TR>
<TD></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="99%"></TD></TR>


<TR>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">Yours very truly,</FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-size:1px">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000">&nbsp;</TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Name:</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Title:</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Address:</FONT></P></TD></TR>
</TABLE></DIV>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">Exhibit B-2
</FONT></P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B><U>Exhibit C </U></B></FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>CHIEF FINANCIAL OFFICER&#146;S CERTIFICATE </B></FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2">March&nbsp;6, 2012 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The undersigned, in his capacity as the Chief Financial
Officer of PAA GP LLC, a Delaware limited liability company and the general partner of Plains All American Pipeline, L.P., a Delaware limited partnership (the &#147;Partnership&#148;), does hereby certify that he is familiar with the accounting,
operations and record systems of the Partnership and that, to his knowledge after reasonable investigation, there has not been any material adverse change in the financial position, results of operations, cash flows or working capital of the
Partnership since December&nbsp;31, 2011. In addition, as of the date of this certificate, the total debt of the Partnership is approximately $5.2 billion. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Capitalized terms used but not defined herein have the meanings assigned to them in the Underwriting Agreement dated as of the date hereof by and among the Partnership and Barclays Capital Inc., Citigroup
Global Markets Inc., J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated UBS Securities LLC and Wells Fargo Securities, LLC as the representatives of the several Underwriters. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">This certificate is to assist the Underwriters in conducting and documenting their investigation of the affairs of the Partnership in
connection with the offering of the Units covered by the Registration Statement, the Pricing Disclosure Package and the Prospectus. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="2">[Signature Page Follows] </FONT></P>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">Exhibit C-1
</FONT></P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">IN WITNESS WHEREOF, the undersigned has hereunto affixed his signature as of the date first
written above. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE">


<TR>
<TD></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="99%"></TD></TR>


<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-size:1px">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000">&nbsp;</TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Al Swanson</FONT></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><I>Executive Vice President and</I></FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT
STYLE="font-family:Times New Roman" SIZE="2"><I>Chief Financial Officer</I></FONT></P></TD></TR>
</TABLE></DIV>
 <p STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2">Exhibit C-2
</FONT></P>

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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>d313008dex51.htm
<DESCRIPTION>OPINION OF VINSON & ELKINS L.L.P.
<TEXT>
<HTML><HEAD>
<TITLE>&lt;![CDATA[Opinion of Vinson &amp; Elkins L.L.P.]]&gt;</TITLE>
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Exhibit&nbsp;5.1 </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">March&nbsp;8, 2012 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains All American Pipeline, L.P. </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">333 Clay Street, Suite&nbsp;1600 </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Houston, Texas
77002 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Ladies and Gentlemen: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">We have acted as counsel for Plains All American Pipeline, L.P., a Delaware limited partnership (the &#147;Partnership&#148;), with respect to certain legal matters in connection with the registration by
the Partnership with the Securities and Exchange Commission (the &#147;Commission&#148;) under the Securities Act of 1933, as amended (the &#147;Securities Act&#148;), of the offer and sale by the Partnership of up to 5,750,000 common units
representing limited partner interests in the Partnership (the &#147;Units&#148;). We have participated in the preparation of a Prospectus Supplement dated March&nbsp;6, 2012 (the &#147;Prospectus Supplement&#148;) and the Prospectus dated
October&nbsp;14, 2009 (the &#147;Prospectus&#148;) forming part of the Registration Statement on Form S-3 (No.&nbsp;333-162475) (the &#147;Registration Statement&#148;) to which this opinion is an exhibit. The Prospectus Supplement has been filed
pursuant to Rule 424(b) promulgated under the Securities Act. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">In rendering the opinions set forth below, we have examined and
relied upon (i)&nbsp;the Delaware Revised Uniform Partnership Act (the &#147;Delaware LP Act&#148;), (ii)&nbsp;the Registration Statement, the Prospectus Supplement and the Prospectus, (iii)&nbsp;the Third Amended and Restated Agreement of Limited
Partnership of the Partnership, dated as of June&nbsp;27, 2001, as amended as of the date hereof, (iv)&nbsp;the Certificate of Limited Partnership of the Partnership, (v)&nbsp;an Underwriting Agreement, dated March&nbsp;6, 2012 relating to the
offering and sale of the Units (the &#147;Underwriting Agreement&#148;), a copy of which is being filed with the Securities and Exchange Commission as an exhibit to the Partnership&#146;s Current Report on Form 8-K on or about the date hereof,
(vi)&nbsp;certain resolutions adopted by the board of directors of PAA GP LLC, the general partner of the Partnership, approving and authorizing, among other things, the Registration Statement and other matters relating to the offering of the Units
and (vii)&nbsp;such other certificates, statutes and other instruments and documents as we consider appropriate for purposes of the opinions hereafter expressed. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Based upon and subject to the foregoing and the assumptions, limitations and qualifications set forth herein, we are of the opinion that the Units are duly and validly authorized for issuance and, upon
payment and delivery of the Units in accordance with the Underwriting Agreement, the Prospectus Supplement and the Prospectus, will be validly issued, fully paid and non-assessable. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The opinions expressed herein are qualified in the following respects: </FONT></P>
<P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2">A.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">We have assumed, without independent verification, that the certificates for the Units will conform to the specimens thereof examined by us and will have been duly
countersigned by a transfer agent and duly registered by a registrar of the Units. </FONT></TD></TR></TABLE> <P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2">B.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">We have assumed that (i)&nbsp;each document submitted to us for review is accurate and complete, each such document that is an original is authentic, each such document
that is a copy conforms to an authentic original and all signatures on each such document are genuine, and (ii)&nbsp;each certificate from governmental officials reviewed by us is accurate, complete and authentic, and all official public records are
accurate and complete. </FONT></TD></TR></TABLE> <P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2">C.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">This opinion is limited in all respects to federal laws, the Delaware LP Act and the Constitution of the State of Delaware, as interpreted by the courts of the State of
Delaware and of the United States. </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">We hereby consent to the filing of this opinion of counsel as
Exhibit&nbsp;5.1 to the Current Report on Form 8-K of the Partnership dated on or about the date hereof, to the incorporation by reference of this opinion of counsel into the Registration Statement and to the reference to our Firm under the heading
&#147;Legal Matters&#148; in the Prospectus Supplement and the Prospectus. In giving such consent, we do not admit that we are within the category of persons whose consent is required under Section&nbsp;7 of the Securities Act or the rules and
regulations of the Commission issued thereunder. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P><DIV ALIGN="right">
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<TR>
<TD></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="99%"></TD></TR>


<TR>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">Very truly yours,</FONT></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ Vinson&nbsp;&amp; Elkins L.L.P.</FONT></TD></TR>
<TR>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"></TD></TR>
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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-8.1
<SEQUENCE>4
<FILENAME>d313008dex81.htm
<DESCRIPTION>OPINION OF VINSON & ELKINS L.L.P. AS TO CERTAIN TAX MATTERS
<TEXT>
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<IMG SRC="g313008313008_53.jpg" ALT="LOGO">
 </P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Exhibit 8.1 </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">March&nbsp;8, 2012 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains All American Pipeline, L.P. </FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">333 Clay Street, Suite 1600 </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Houston, Texas
77002 </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="font-family:Times New Roman" SIZE="2">RE:</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">Plains All American Pipeline, L.P. Registration Statement on Form S-3 </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Ladies and Gentlemen: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">We have acted as counsel for Plains All American Pipeline,
L.P. (the &#147;<B><I>Partnership</I></B>&#148;), a Delaware limited partnership, with respect to certain legal matters in connection with the offer and sale of common units representing limited partner interests in the Partnership. We have also
participated in the preparation of a Prospectus Supplement dated March&nbsp;6, 2012 (the &#147;<B><I>Prospectus Supplement</I></B>&#148;) and the Prospectus dated October&nbsp;14, 2009 (the &#147;<B><I>Prospectus</I></B>&#148;), forming part of the
Registration Statement on Form&nbsp;S-3, No.&nbsp;333-162475 (the &#147;<B><I>Registration Statement</I></B>&#148;). </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">This
opinion is based on various facts and assumptions, and is conditioned upon certain representations made by the Partnership as to factual matters through a certificate of an officer of the Partnership (the &#147;<B><I>Officer&#146;s
Certificate</I></B>&#148;). In addition, this opinion is based upon the factual representations of the Partnership concerning its business, properties and governing documents as set forth in the Registration Statement. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">In our capacity as counsel to the Partnership, we have made such legal and factual examinations and inquiries, including an examination
of originals or copies certified or otherwise identified to our satisfaction of such documents, corporate records and other instruments, as we have deemed necessary or appropriate for purposes of this opinion. In our examination, we have assumed the
authenticity of all documents submitted to us as originals, the genuineness of all signatures thereon, the legal capacity of natural persons executing such documents and the conformity to authentic original documents of all documents submitted to us
as copies. For the purpose of our opinion, we have not made an independent investigation or audit of the facts set forth in the above-referenced documents or in the Officer&#146;s Certificate. In addition, in rendering this opinion we have assumed
the truth and accuracy of all representations and statements made to us which are qualified as to knowledge or belief, without regard to such qualification. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">We are opining herein as to the effect on the subject transaction only of the federal income tax laws of the United States, and we express no opinion with respect to the applicability thereto, or the
effect thereon, of other federal laws, foreign laws, the laws of any state or any other jurisdiction or as to any matters of municipal law or the laws of any other local agencies within any state. Based on the facts, assumptions and representations
set forth herein, the discussion in the Prospectus under the caption &#147;Material Income Tax Considerations&#148; as updated by the discussion in the Prospectus Supplement under the caption &#147;Material U.S. Federal Income Tax
Consequences,&#148; insofar as such discussions purport to constitute summaries of U.S. federal income tax law and regulations or legal </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD VALIGN="top" NOWRAP> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Vinson &amp; Elkins LLP Attorneys at Law</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Abu Dhabi Austin Beijing Dallas Dubai Hong Kong Houston London</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Moscow New York Palo Alto Riyadh
Shanghai Tokyo Washington</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">First City Tower, 1001 Fannin Street, Suite 2500</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Houston, TX 77002-6760</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Tel</B> +1.713.758.2222 <B>Fax</B> +1.713.758.2346
<B>www.velaw.com</B></FONT></P></TD></TR>
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 </P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Exhibit 8.1 </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">conclusions with respect thereto, constitute the opinion of Vinson&nbsp;&amp; Elkins LLP as to the material U.S. federal income tax consequences of the matters described therein. No opinion is expressed
as to any matter not discussed herein. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">This opinion is rendered to you as of the effective date of the Registration
Statement, and we undertake no obligation to update this opinion subsequent to the date hereof. This opinion is based on various statutory provisions, regulations promulgated thereunder and interpretations thereof by the Internal Revenue Service and
the courts having jurisdiction over such matters, all of which are subject to change either prospectively or retroactively. Also, any variation or difference in the facts from those set forth in the representations described above, including in the
Registration Statement and the Officer&#146;s Certificate, may affect the conclusions stated herein. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">This opinion is
furnished to you, and is for your use in connection with the transactions set forth in the Registration Statement. This opinion may not be relied upon by you for any other purpose or furnished to, assigned to, quoted to or relied upon by any other
person, firm or other entity, for any purpose, without our prior written consent. However, this opinion may be relied upon by you and by persons entitled to rely on it pursuant to applicable provisions of federal securities law, including persons
purchasing common units or debt securities pursuant to the Registration Statement. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">We hereby consent to the filing of this
opinion of counsel as Exhibit 8.1 to the Current Report on Form 8-K of the Partnership dated on or about the date hereof, to the incorporation by reference of this opinion of counsel into the Registration Statement and to the reference to our firm
in the Prospectus and the Prospectus Supplement. In giving such consent, we do not admit that we are within the category of persons whose consent is required under Section&nbsp;7 of the Securities Act of 1933, as amended. </FONT></P>
<P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P><DIV ALIGN="right">
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<TD VALIGN="top" COLSPAN="3"><FONT STYLE="font-family:Times New Roman" SIZE="2">Very truly yours,</FONT></TD></TR>
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<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2">/s/ VINSON&nbsp;&amp; ELKINS L.L.P.</FONT></TD></TR>
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<TD VALIGN="bottom"><FONT STYLE="font-family:Times New Roman" SIZE="2">Vinson&nbsp;&amp; Elkins L.L.P.</FONT></TD></TR>
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<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>5
<FILENAME>d313008dex991.htm
<DESCRIPTION>PRESS RELEASE
<TEXT>
<HTML><HEAD>
<TITLE>Press Release</TITLE>
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Exhibit 99.1 </B></FONT></P>
<P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD VALIGN="top" ALIGN="right"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>New Release</B></FONT></TD></TR>
</TABLE> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD VALIGN="top"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Contacts:</B></FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Roy I. Lamoreaux</B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>Director, Investor Relations</B></FONT></P>
<P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B>713-646-4222 &#150; 800-564-3036</B></FONT></P></TD></TR>
</TABLE> <P STYLE="margin-top:12px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B><U>FOR IMMEDIATE RELEASE</U></B> </FONT></P> <P STYLE="margin-top:24px;margin-bottom:0px" ALIGN="center"><FONT
STYLE="font-family:Times New Roman" SIZE="5"><B>Plains All American Pipeline, L.P. Prices </B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="5"><B>Public Offering of Common
Units </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">(Houston &#150; March&nbsp;6, 2012) Plains All American Pipeline, L.P. (NYSE: PAA) announced today that it has
priced an underwritten public offering of 5,000,000 of its common units representing limited partner interests at $80.03 per common unit. The offering is expected to close on March&nbsp;9, 2012. The Partnership has also granted the underwriters a
30-day option to purchase up to 750,000 additional common units to cover over-allotments, if any. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The Partnership intends to
use the net proceeds of the offering, including the proceeds from any exercise of the over-allotment option, to fund a portion of the proposed acquisition (the &#147;BP NGL Acquisition&#148;) of BP Canada Energy Company, a wholly owned subsidiary of
BP Corporation North America, Inc. Pending the application of the net proceeds to fund the BP NGL Acquisition, the Partnership intends to repay all borrowings outstanding under the PAA credit facilities and use the balance for general partnership
purposes. If the BP NGL Acquisition is not consummated for any reason, the Partnership will use the net proceeds for general partnership purposes, including future acquisitions and capital program expenditures. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">Barclays Capital, BofA Merrill Lynch, Citigroup, J.P. Morgan, UBS Investment Bank, and Wells Fargo Securities are joint book-running
managers of the offering. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">When available, copies of the prospectus supplement and accompanying base prospectus relating to
the offering may be obtained from the underwriters as follows: </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Barclays Capital Inc.</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">c/o Broadridge Financial Solutions</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">1155 Long Island Avenue</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Edgewood, New York 11717</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Telephone: (888) 603-5847</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:1px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2"><U>Barclaysprospectus@broadridge.com</U></FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">BofA Merrill Lynch</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">4 World
Financial Center</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">New York, New York 10080</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Attn: Prospectus Department <U>dg.prospectus_requests@baml.com</U></FONT></P></TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Citigroup Global Markets Inc.</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Brooklyn Army Terminal</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Attention: Prospectus Delivery Dept.</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">140 58</FONT><FONT STYLE="font-family:Times New Roman" SIZE="1"><SUP
STYLE="vertical-align:baseline; position:relative; bottom:.8ex">th</SUP></FONT><FONT STYLE="font-family:Times New Roman" SIZE="2"> Street, Brooklyn, NY 11220</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Telephone: (800)&nbsp;831-9146</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:1px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2"><U>batprospectusdept@citi.com</U></FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">J.P. Morgan Securities LLC</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">via
Broadridge Financial Solutions</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">1155 Long Island Avenue</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Edgewood, New York 11717</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Telephone: (866) 803-9204</FONT></P></TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">UBS Securities LLC</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Attention: Prospectus Dept.</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">299 Park Avenue</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:1.00em; text-indent:-1.00em"><FONT
STYLE="font-family:Times New Roman" SIZE="2">New York, NY 10171</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px; margin-left:1.00em; text-indent:-1.00em"><FONT STYLE="font-family:Times New Roman" SIZE="2">Telephone: (888)
827-7275</FONT></P></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Wells Fargo Securities</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Attention: Equity Syndicate Dept.</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">375 Park
Avenue</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">New York, NY 10152</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT STYLE="font-family:Times New Roman" SIZE="2">Telephone:
(800) 326-5897</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT STYLE="font-family:Times New Roman" SIZE="2"><U>cmclientsupport@wellsfargo.com</U></FONT></P></TD></TR>
</TABLE>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">The common units were offered and sold pursuant to an effective shelf registration statement
on Form S-3 previously filed with the Securities and Exchange Commission. This news release does not constitute an offer to sell or a solicitation of an offer to buy the securities described herein, nor shall there be any sale of these securities in
any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. The offering may be made only by means of a prospectus and related
prospectus supplement. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT STYLE="font-family:Times New Roman" SIZE="2">Except for the historical information contained herein, the matters discussed in this news release are
forward-looking statements that involve certain risks and uncertainties. These risks and uncertainties include, among other things, the stability of the capital markets and other factors and uncertainties inherent in the marketing, transportation,
terminalling, gathering and storage of crude oil and other petroleum-related products discussed in the Partnership&#146;s filings with the Securities and Exchange Commission. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
STYLE="font-family:Times New Roman" SIZE="2">Plains All American Pipeline, L.P. is a publicly-traded master limited partnership engaged in the transportation, storage, terminalling and marketing of crude oil and refined products, as well as in the
processing, transportation, fractionation, storage and marketing of natural gas liquids. Through its general partner interest and majority equity ownership position in PAA Natural Gas Storage, L.P. (NYSE: PNG), PAA owns and operates natural gas
storage facilities. PAA is headquartered in Houston, Texas. </FONT></P> <P STYLE="margin-top:24px;margin-bottom:0px" ALIGN="center"><FONT STYLE="font-family:Times New Roman" SIZE="2"><B># # # </B></FONT></P>
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`
end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
