<SUBMISSION>
<ACCESSION-NUMBER>0000950129-04-009655
<TYPE>424B3
<PUBLIC-DOCUMENT-COUNT>3
<FILING-DATE>20041210
<DATE-OF-FILING-DATE-CHANGE>20041210
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>QUANTA SERVICES INC
<CIK>0001050915
<ASSIGNED-SIC>1731
<IRS-NUMBER>742851603
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>424B3
<ACT>33
<FILE-NUMBER>333-114938
<FILM-NUMBER>041194727
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>1360 POST OAK BLVD
<STREET2>SUITE 2100
<CITY>HOUSTON
<STATE>TX
<ZIP>77056
<PHONE>7133506000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>1360 POST OAK BLVD SUITE 2100
<CITY>HOUSTON
<STATE>TX
<ZIP>77056
</MAIL-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>h20851b3e424b3.htm
<DESCRIPTION>QUANTA SERVICES, INC.- REGISTRATION NO. 333-114938
<TEXT>
<HTML>
<HEAD>
<TITLE>e424b3</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV align="right">
<FONT size="2">Filed pursuant to Rule 424(b)(3)
</FONT>
</DIV>

<DIV align="right">
<FONT size="2">Registration Nos. 333-114938
</FONT>
</DIV>

<DIV align="right">
<FONT size="2">333-119134
</FONT>
</DIV>

<DIV align="left">
<B><FONT size="2">PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED
JUNE&nbsp;30, 2004</FONT></B>
</DIV>

<P align="center">
<B><FONT size="5">3,692,000&nbsp;Shares</FONT></B>

<P align="center">
<IMG src="h20851b3h2085177.gif" alt="(QUANTA SERVICES, INC. LOGO)">

<P align="center">
<B><FONT size="5">Common Stock</FONT></B>

<P align="left">
<FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
selling stockholder is offering 3,692,000&nbsp;shares of our
common stock by this prospectus supplement and the accompanying
prospectus. We will not receive any of the proceeds from the
sale of the shares by the selling stockholder.
</FONT>

<P align="left">
<FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
common stock is traded on the New York Stock Exchange under the
symbol &#147;PWR.&#148; The last reported sale price of our
common stock on December&nbsp;9, 2004 was $7.67&nbsp;per share.
</FONT>

<CENTER>
<TABLE width="100%" align="center" cellspacing="0" cellpadding="0" border="0">

<TR>
    <TD width="50%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="7%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="7%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="6%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="7%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="6%"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="3"></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Underwriting</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Net Proceeds to</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="3"></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Discounts and</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Selling</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Price to Public</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Commissions</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Stockholder</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Per Share
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">7.15</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">0.15</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">7.00</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Total
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">26,397,800</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">553,800</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">25,844,000</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

</TABLE>
</CENTER>

<P align="left">
<FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Investing
in our common stock involves a high degree of risk. See
&#147;Risks of Investing in Our Shares&#148; beginning on
page&nbsp;S-3 of this prospectus supplement and page&nbsp;3 of
the accompanying prospectus.</B>
</FONT>

<P align="left">
<FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
underwriter expects to deliver the shares of common stock on or
about December&nbsp;15, 2004.
</FONT>

<P align="left">
<FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Neither
the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or
passed upon the adequacy or accuracy of this prospectus
supplement or the accompanying prospectus. Any representation to
the contrary is a criminal offense.</B>
</FONT>

<P align="center">
<B><FONT size="4">JPMorgan</FONT></B>

<P align="left">
<FONT size="2">December&nbsp;9, 2004
</FONT>
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<DIV align="left">

</DIV>

<DIV align="left">
<!-- TOC -->
</DIV>

<DIV align="left">
<A name="tocpage"></A>
</DIV>

<P align="center">
<B><FONT size="2">TABLE OF CONTENTS</FONT></B>

<CENTER>
<TABLE width="60%" align="center" cellspacing="0" cellpadding="0" border="0">

<TR>
    <TD width="91%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="6%"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD colspan="3" align="center" valign="top">
    <B><FONT size="2">Prospectus Supplement</FONT></B></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#101'>About This Prospectus
    Supplement</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">ii
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#102'>Special Note&nbsp;Regarding
    Forward-Looking Statements</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">ii
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#103'>Prospectus Supplement
    Summary</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-1
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#104'>The Offering</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-2
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#105'>Risks of Investing in Our
    Shares</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-3
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#106'>Use of Proceeds</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-5
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#107'>Price Range of Common
    Stock</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-5
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#108'>Dividend Policy</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-5
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#109'>Selling Stockholder</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-6
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#110'>Description of Capital
    Stock</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-7
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#111'>Underwriting</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-12
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#112'>Legal Matters</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-13
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#113'>Experts</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-13
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#114'>Where You Can Find More
    Information</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-13
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#115'>Incorporation of Certain
    Documents by Reference</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">S-14
    </FONT></TD>
</TR>

<TR>
    <TD colspan="3" align="center" valign="top">
    <B><FONT size="2">Prospectus</FONT></B></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Special Note&nbsp;Regarding Forward-Looking
    Statements</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">i
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Summary</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">1
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Risks of Investing in Our Shares</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">3
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Proceeds from the Sale of Shares</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">9
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Selling Stockholder</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">9
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">How the Shares May Be Distributed</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">11
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Legal Matters</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">12
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Experts</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">12
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Where You Can Find More Information</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">13
    </FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Incorporation of Certain Documents by
    Reference</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom">
    <FONT size="2">13
    </FONT></TD>
</TR>

</TABLE>
</CENTER>

<DIV align="left">
<!-- /TOC -->
</DIV>

<P align="center">
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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV align="left">
<A name='101'></A>
</DIV>

<!-- link1 "<FONT size="2">ABOUT THIS PROSPECTUS SUPPLEMENT</FONT>" -->

<P align="center">
<B><FONT size="2">ABOUT THIS PROSPECTUS SUPPLEMENT</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">This document is in two parts. The first part is
this prospectus supplement, which describes the specific terms
of this offering and also adds to and updates information
contained in the accompanying prospectus and the documents
incorporated by reference. The second part is the accompanying
prospectus, which gives more general information, some of which
may not apply to this offering.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">If the description of the offering varies between
the prospectus supplement and the accompanying prospectus, you
should rely on the information in the prospectus supplement.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">You should rely only on the information contained
or incorporated by reference in this prospectus supplement and
the accompanying prospectus. We have not, and the underwriter
has not, authorized anyone to provide you with additional or
different information. If anyone provides you with additional,
different or inconsistent information, you should not rely on
it. We and the selling stockholder are offering to sell the
shares, and seeking offers to buy the shares, only in
jurisdictions where offers and sales are permitted. You should
not assume that the information we have included in this
prospectus supplement or the accompanying prospectus is accurate
as of any date other than the date of this prospectus supplement
or the accompanying prospectus or that any information we have
incorporated by reference is accurate as of any date other than
the date of the document incorporated by reference. Our
business, financial condition, results of operations and
prospects may have changed since those dates.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">In this prospectus supplement, unless the context
indicates otherwise, references to &#147;Quanta,&#148;
&#147;we,&#148; &#147;our&#148; or &#147;us&#148; refer to
Quanta Services, Inc. and its consolidated subsidiaries.
</FONT>

<DIV align="left">
<A name='102'></A>
</DIV>

<!-- link1 "<FONT size="2">SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS</FONT>" -->

<P align="center">
<B><FONT size="2">SPECIAL NOTE&nbsp;REGARDING FORWARD-LOOKING
STATEMENTS</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">This prospectus supplement and the accompanying
prospectus include statements reflecting assumptions,
expectations, projections, intentions or beliefs about future
events that are intended as &#147;forward-looking
statements&#148; under the Private Securities Litigation Reform
Act of 1995. You can identify these statements by the fact that
they do not relate strictly to historical or current facts. They
use words such as &#147;anticipate,&#148; &#147;estimate,&#148;
&#147;project,&#148; &#147;forecast,&#148; &#147;may,&#148;
&#147;will,&#148; &#147;should,&#148; &#147;could,&#148;
&#147;expect,&#148; &#147;believe&#148; and other words of
similar meaning. In particular, these include, but are not
limited to, statements relating to the following:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">projected operating or financial results;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">expectations regarding capital expenditures;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the effects of competition in our markets;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the duration and extent of the current economic
    downturn in the industries we serve;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to achieve cost savings.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Any or all of our forward-looking statements may
turn out to be wrong. They can be affected by inaccurate
assumptions and by known or unknown risks and uncertainties,
including the following:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">quarterly variations in our operating results due
    to seasonality and adverse weather conditions;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our dependence on fixed price contracts;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the inability of our customers to pay for
    services following a bankruptcy or other financial difficulty;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">materially adverse changes in economic conditions
    in the markets served by us or by our customers;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">rapid technological and structural changes that
    could reduce the demand for the services we provide;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to effectively compete for market
    share;
    </FONT></TD>
</TR>

</TABLE>

<P align="center"><FONT size="2">ii
</FONT>

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<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">cancellation provisions within our contracts and
    the risk that contracts expire and are not renewed;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">liabilities for claims that are self-insured or
    for claims that our casualty insurance carrier fails to pay;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">potential liabilities relating to occupational
    health and safety matters;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">retention of key personnel and qualified
    employees;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the impact of our unionized workforce on our
    operations and our ability to complete future acquisitions;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our growth outpacing our infrastructure;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to obtain performance bonds;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">potential exposure to environmental liabilities;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the cost of borrowing, availability of credit,
    debt covenant compliance and other factors affecting our
    financing activities;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to generate internal growth;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the adverse impact of goodwill impairments;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">replacement of our contracts as they are
    completed or expire;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to effectively integrate the
    operations of our companies;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">beliefs and assumptions about the collectibility
    of receivables;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">beliefs or assumptions about the outlook for
    markets we serve;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the other risks and uncertainties as are
    described under &#147;Risks of Investing In Our Shares&#148; in
    this prospectus supplement and the accompanying prospectus and
    as may be detailed from time to time in our public filings with
    the Securities and Exchange Commission (SEC).
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Many of these factors will be important in
determining our actual future results. Consequently, no
forward-looking statement can be guaranteed. Our actual future
results may vary materially from those expressed or implied in
any forward-looking statements.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">All of our forward-looking statements, whether
written or oral, are expressly qualified by these cautionary
statements and any other cautionary statements that may
accompany such forward-looking statements. In addition, we
disclaim any obligation to update any forward-looking statements
to reflect events or circumstances after the date of this
prospectus supplement.
</FONT>

<P align="center"><FONT size="2">iii
</FONT>

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<DIV style="width: 100%; border: 1px solid black; padding: 12px;">

<DIV align="left">
<A name='103'></A>
</DIV>

<!-- link1 "<FONT size="2">PROSPECTUS SUPPLEMENT SUMMARY</FONT>" -->

<P align="center">
<B><FONT size="2">PROSPECTUS SUPPLEMENT SUMMARY</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<I><FONT size="2">The following summary does not contain all of
the information that you should consider before investing in our
common stock. This summary is qualified in its entirety by the
more detailed information, including our consolidated financial
statements and related notes thereto, incorporated by reference
in this prospectus supplement and the accompanying prospectus.
You should carefully consider this entire prospectus supplement
and the accompanying prospectus, including the &#147;Risks of
Investing In Our Shares&#148; sections, before making an
investment decision.</FONT></I>

<P align="left">
<B><FONT size="2">Quanta Services</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We are a leading national provider of specialty
contracting solutions to the electric power, gas,
telecommunications, cable television and specialty services
industries. We believe that we are the largest contractor
serving the transmission and distribution sector of the North
American electric utility industry. Through our nationwide
network, we provide design, installation, repair, maintenance
and emergency response services that enable our customers to
reduce costs, increase operating efficiencies and improve
network performance.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Within the electric power and natural gas end
markets, services we provide include: installation, repair and
maintenance of electric power distribution networks, electric
transmission lines and natural gas distribution systems; storm
damage restoration; and substation projects. Within the
telecommunications and cable television end markets, services we
provide include: fiber optic, copper, and coaxial cable
installation and maintenance for video, data and voice
transmission; design, construction and maintenance of DSL
networks and switching systems; engineering and erection of
wireless telecommunications towers; and residential installation
and customer connects for cable television. We also provide
specialty services that include: inside electrical wiring;
intelligent traffic networks; cable control systems for light
rail lines, airports and highways; and specialty rock trenching,
directional boring and road milling for industrial and
commercial customers.
</FONT>

<P align="left">
<B><FONT size="2">Recent developments</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">On November&nbsp;3, 2004, we reported financial
results for the three months and nine months ended
September&nbsp;30, 2004. Revenues for the three months ended
September&nbsp;30, 2004 were $463.1&nbsp;million, compared to
revenues of $436.1&nbsp;million in the third quarter of 2003.
Net income attributable to common stock for the three months
ended September&nbsp;30, 2004 was $4.2&nbsp;million, or
$0.04&nbsp;per diluted share, compared to net income of
$5.4&nbsp;million, or $0.05&nbsp;per diluted share, in the third
quarter of 2003.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">For the nine months ended September&nbsp;30,
2004, our revenues were $1.21&nbsp;billion compared to revenues
of $1.21&nbsp;billion for the first nine months of 2003. Net
loss attributable to common stock for the nine months ended
September&nbsp;30, 2004 was $11.0&nbsp;million, or a loss per
diluted share of $0.10, compared to a net loss of
$7.2&nbsp;million, or a loss per diluted share of $0.06, for the
first nine months of 2003. For more information regarding our
financial position and results of operations as of and for the
period ended September&nbsp;30, 2004, please see our
consolidated financial statements and &#147;Management&#146;s
Discussion and Analysis of Financial Condition and Results of
Operations&#148; contained in our Quarterly Report on
Form&nbsp;10-Q for the nine months ended September&nbsp;30,
2004, which is incorporated by reference herein.
</FONT>
</DIV>

<P align="center"><FONT size="2">S-1
</FONT>

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<DIV style="width: 100%; border: 1px solid black; padding: 12px;">

<DIV align="left">
<A name='104'></A>
</DIV>

<!-- link1 "<FONT size="2">THE OFFERING</FONT>" -->

<P align="center">
<B><FONT size="2">THE OFFERING</FONT></B>

<DIV>&nbsp;</DIV>

<TABLE width="100%" align="center" cellspacing="0" cellpadding="0" border="0">

<TR>
    <TD width="19%"></TD>
    <TD width="1%"></TD>
    <TD width="80%"></TD>
</TR>

<TR>
    <TD valign="top">
    <FONT size="2">Common stock offered by the selling stockholder
    </FONT></TD>
    <TD></TD>
    <TD valign="top">
    <FONT size="2">3,692,000&nbsp;shares
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR>
    <TD valign="top">
    <FONT size="2">Common stock outstanding on December&nbsp;9, 2004
    </FONT></TD>
    <TD></TD>
    <TD valign="top">
    <FONT size="2">116,192,418&nbsp;shares
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR>
    <TD valign="top">
    <FONT size="2">Use of proceeds
    </FONT></TD>
    <TD></TD>
    <TD valign="top">
    <FONT size="2">We will not receive any of the proceeds from the
    sale of shares by the selling stockholder. The selling
    stockholder will receive all net proceeds from the sale of
    shares of our common stock offered in this prospectus supplement.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR>
    <TD valign="top">
    <FONT size="2">New York Stock Exchange symbol
    </FONT></TD>
    <TD></TD>
    <TD valign="top">
    <FONT size="2">PWR
    </FONT></TD>
</TR>

</TABLE>

<DIV align="center">
<HR size="1" width="33%" align="center" noshade>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our common stock outstanding on December&nbsp;9,
2004 excludes:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">1,158,320&nbsp;shares of common stock issuable
    upon exercise of stock options outstanding as of
    December&nbsp;9, 2004 at a weighted average exercise price of
    $11.54&nbsp;per share;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">The shares of common stock issuable upon
    conversion of our 4.0%&nbsp;convertible subordinated notes due
    2007 and our 4.5%&nbsp;convertible subordinated notes due 2023.
    </FONT></TD>
</TR>

</TABLE>
</DIV>

<P align="center"><FONT size="2">S-2
</FONT>

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<DIV align="left">
<A name='105'></A>
</DIV>

<!-- link1 "<FONT size="2">RISKS OF INVESTING IN OUR SHARES</FONT>" -->

<P align="center">
<B><FONT size="2">RISKS OF INVESTING IN OUR SHARES</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<I><FONT size="2">You should consider the following risk
factors, the discussion of risks commencing on page&nbsp;3 of
the accompanying prospectus and the discussion of risks in our
other current filings with the SEC under the Exchange Act, which
are incorporated herein by reference, in addition to the other
information in this prospectus supplement and the accompanying
prospectus, in evaluating us, our business and an investment in
our common stock. The following risks, as well as other risks
and uncertainties, could seriously harm our business and
financial results and cause the value of our common stock to
decline, which in turn could cause you to lose all or part of
your investment.</FONT></I>

<P align="left">
<B><FONT size="2">Risks related to our business</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">We extend credit to customers for purchases
of our services, and in the past we have had, and in the future
we may have, difficulty collecting receivables from major
customers that have filed bankruptcy or are otherwise
experiencing financial difficulties.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We grant credit, generally without collateral, to
our customers, which include electric power and gas companies,
telecommunications and cable television system operators,
governmental entities, general contractors, and builders, owners
and managers of commercial and industrial properties located
primarily in the United States. Consequently, we are subject to
potential credit risk related to changes in business and
economic factors throughout the United States. Our customers in
the telecommunications business have experienced significant
financial difficulties and in several instances have filed for
bankruptcy. A number of our utility customers are also
experiencing business challenges in the current business
climate. If additional major customers file for bankruptcy or
continue to experience financial difficulties, or if anticipated
recoveries relating to receivables in existing bankruptcies or
other workout situations fail to materialize, we could
experience reduced cash flows and losses in excess of current
allowances provided. In addition, material changes in any of our
customer&#146;s revenues or cash flows could affect our ability
to collect amounts due from them. As of September&nbsp;30, 2004,
total current and non-current accounts and notes receivable were
$413.6&nbsp;million, net of allowances for doubtful accounts of
$52.9&nbsp;million.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">Our casualty insurance carrier for prior
periods is experiencing financial distress, which may require us
to make payments for losses that would otherwise be
insured.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our casualty insurance carrier for the policy
periods from August&nbsp;1, 2000 to February&nbsp;28, 2003 is
experiencing financial distress but is currently paying valid
claims. In the event that this insurer&#146;s financial
situation further deteriorates, we may be required to pay
certain obligations that otherwise would have been paid by this
insurer. We estimate that the total future claim amounts that
this insurer is currently obligated to pay on our behalf for the
above-mentioned policy periods is between $2.0&nbsp;million and
$8.0&nbsp;million. The actual amounts ultimately paid by us
related to these claims, if any, may vary materially from the
above range and could be impacted by further claims development
and the extent to which the insurer can not honor its
obligations. In any event, we do not expect any failure by this
insurer to honor its obligations to us to have a material
adverse impact on our financial condition; however, the impact
could be material to our results of operations or cash flow in a
given period.
</FONT>

<P align="left">
<B><FONT size="2">Risks related to our common stock</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">Our stock price may fluctuate
substantially.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our common stock is traded on the New York Stock
Exchange under the symbol &#147;PWR.&#148; The market price of
our stock has fluctuated substantially in the past and could
fluctuate substantially in the future, based on a variety of
factors, including our operating results, availability of
capital, our ability to comply with reporting requirements under
the Sarbanes-Oxley Act of 2002, changes in general conditions
</FONT>

<P align="center"><FONT size="2">S-3
</FONT>

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<DIV align="left">
<FONT size="2">in the economy, the financial markets, economic
conditions in the markets served by our customers or other
developments affecting us, our customers or our competitors,
some of which may be unrelated to our performance. Those
fluctuations and demand for our services may adversely affect
the price of our stock. In addition, if our results of
operations fail to meet the expectations of investors, our stock
price could decline.
</FONT>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Furthermore, the stock market in general has
experienced volatility that has often been unrelated to the
operating performance of companies in our industry. These
fluctuations and general economic, political and market
conditions may adversely affect the market price of our common
stock, regardless of our operating results. Among other things,
volatility in our stock price could mean that investors will not
be able to sell their shares at or above the prices that they
pay in this offering. The volatility also could impair our
ability in the future to offer common stock as a source of
additional capital or as consideration in the acquisition of
other businesses.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">A number of shares of our common stock are
or will be eligible for future sale, which may cause our stock
price to decline.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The market price of our common stock could
decline as a result of sales of a large number of shares of
common stock in the public market or the perception that such
sales could occur. These sales, or the possibility that these
sales may occur, also might make it more difficult for us to
sell equity securities in the future at a time and at a price
that we deem appropriate. Shares of common stock issued upon the
conversion, redemption or repurchase of our $270.0&nbsp;million
issuance of 4.5%&nbsp;convertible subordinated notes could cause
substantial dilution to existing stockholders, which could cause
the market price of our common stock to decline.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">As of December&nbsp;9, 2004, we had approximately
116.2&nbsp;million shares of common stock outstanding. Of those
shares, approximately 94.2&nbsp;million shares will be freely
tradeable upon completion of this offering. Of the remaining
shares, approximately 19.5&nbsp;million may be sold subject to
the volume, manner of sale and other conditions of
Rule&nbsp;144. First Reserve Fund&nbsp;IX, L.P., which will own
approximately 15.2&nbsp;million shares after the sale of all
shares of common stock in this offering, has the ability to
cause us to register the resale of their shares under their
investor&#146;s rights agreement.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">In addition, approximately 1.2&nbsp;million
shares of common stock are issuable upon the exercise of
outstanding stock options issued under our 2001 Stock Incentive
Plan. Approximately 2.5&nbsp;million shares of restricted stock
issued to our employees under our 2001 Stock Incentive Plan are
outstanding, but have not yet vested. Restricted stock grants
under the 2001 Stock Incentive Plan generally vest ratably over
three years. All of the shares issued and issuable under our
2001 Stock Incentive Plan have been registered and will be
freely tradable upon exercise or vesting.
</FONT>

<P align="center"><FONT size="2">S-4
</FONT>

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<DIV align="left">
<A name='106'></A>
</DIV>

<!-- link1 "<FONT size="2">USE OF PROCEEDS</FONT>" -->

<P align="center">
<B><FONT size="2">USE OF PROCEEDS</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We will not receive any of the proceeds from the
sale of shares of our common stock by the selling stockholder.
The selling stockholder will receive all net proceeds from the
sale of shares offered in this prospectus supplement.
</FONT>

<DIV align="left">
<A name='107'></A>
</DIV>

<!-- link1 "<FONT size="2">PRICE RANGE OF COMMON STOCK</FONT>" -->

<P align="center">
<B><FONT size="2">PRICE RANGE OF COMMON STOCK</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our common stock is traded on the New York Stock
Exchange, or NYSE, under the symbol &#147;PWR.&#148; The
following table sets forth, for each of the quarterly periods
indicated, the high and low sales prices of our common stock as
reported by the NYSE.
</FONT>

<CENTER>
<TABLE width="70%" align="center" cellspacing="0" cellpadding="0" border="0">

<TR>
    <TD width="79%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">High</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Low</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <B><FONT size="2">Fiscal Year 2002</FONT></B></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD colspan="9"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">1st&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">17.43</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">11.53</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">2nd&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">18.90</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">9.40</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">3rd&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">10.19</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">1.75</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">4th&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">3.94</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">1.78</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <B><FONT size="2">Fiscal Year 2003</FONT></B></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">1st&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">4.10</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">2.80</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">2nd&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">8.70</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">3.18</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">3rd&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">9.87</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">4.48</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">4th&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">9.10</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">6.95</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <B><FONT size="2">Fiscal Year 2004</FONT></B></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">1st&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">9.52</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">6.50</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">2nd&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">7.24</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">4.83</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">3rd&nbsp;Quarter
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">7.45</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">5.30</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">4th&nbsp;Quarter (through December&nbsp;9, 2004)
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">8.21</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">5.70</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

</TABLE>
</CENTER>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">On December&nbsp;9, 2004, the last sale price for
our common stock as reported by the NYSE was $7.67&nbsp;per
share. As of September&nbsp;15, 2004, there were 998 holders of
record of our common stock.
</FONT>

<DIV align="left">
<A name='108'></A>
</DIV>

<!-- link1 "<FONT size="2">DIVIDEND POLICY</FONT>" -->

<P align="center">
<B><FONT size="2">DIVIDEND POLICY</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We have not paid cash dividends on our common
stock since our initial public offering. Further, we currently
intend to retain our future earnings, if any, to finance the
growth, development and expansion of our business. Accordingly,
we do not intend to declare or pay any cash dividends on our
common stock in the immediate future. The declaration, payment
and amount of future cash dividends, if any, will be at the
discretion of our board of directors after taking into account
various factors. These factors include our financial condition,
results of operations, cash flows from operations, current and
anticipated capital requirements and expansion plans, the income
tax laws then in effect and the requirements of Delaware law. In
addition, the terms of our credit facility include, and any
future financing arrangements we enter into may also include,
prohibitions on the payment of cash dividends without the
consent of the respective lenders.
</FONT>

<P align="center"><FONT size="2">S-5
</FONT>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV align="left">
<A name='109'></A>
</DIV>

<!-- link1 "<FONT size="2">SELLING STOCKHOLDER</FONT>" -->

<P align="center">
<B><FONT size="2">SELLING STOCKHOLDER</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The table below sets forth information as of
December&nbsp;9, 2004 regarding the beneficial ownership of our
common stock by the selling stockholder, First Reserve
Fund&nbsp;IX, L.P.
</FONT>

<CENTER>
<TABLE width="100%" align="center" cellspacing="0" cellpadding="0" border="0">

<TR>
    <TD width="34%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="7"></TD>
    <TD></TD>
    <TD colspan="3"></TD>
    <TD></TD>
    <TD colspan="7"></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><B><FONT size="1">Ownership of common</FONT></B></TD>
    <TD></TD>
    <TD colspan="3"></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><B><FONT size="1">Ownership of common</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><B><FONT size="1">stock before offering</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Number of</FONT></B></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><B><FONT size="1">stock after offering</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">shares being</FONT></B></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><HR size="1" noshade></TD>
</TR>

<TR>
    <TD align="left" nowrap><B><FONT size="1">Name of stockholder</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Number</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Percentage</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">offered</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Number</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Percentage</FONT></B></TD>
</TR>

<TR>
    <TD align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">First Reserve Fund&nbsp;IX, L.P.(1)
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">18,868,052</FONT></TD>
    <TD align="left" valign="bottom" nowrap><FONT size="2">(2)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">16.24%</FONT></TD>
    <TD align="left" valign="bottom" nowrap><FONT size="2">(3)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">3,692,000</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">15,176,052</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">13.06%</FONT></TD>
    <TD align="left" valign="bottom" nowrap><FONT size="2">(3)</FONT></TD>
</TR>

</TABLE>
</CENTER>

<P align="left">
<HR size="1" width="18%" align="left" noshade>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="97%"></TD>
</TR>

<TR valign="top">
    <TD><FONT size="2">(1)&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">First Reserve GP IX, L.P. (GP IX) is the general
    partner of First Reserve and may be deemed to beneficially own
    all of the shares of common stock owned by First Reserve. First
    Reserve GP IX, Inc. (GP Inc.), as the general partner of GP IX,
    may be deemed to beneficially own all of the shares of common
    stock owned by First Reserve. The address for First Reserve is
    One Lafayette Place, Greenwich, Connecticut 06830.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD><FONT size="2">(2)&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Consists of 18,791,204&nbsp;shares of common
    stock held by First Reserve, 45,187&nbsp;shares of common stock
    and options to purchase&nbsp;15,000&nbsp;shares of common stock
    issued to Ben A. Guill in his capacity as a director of Quanta
    and 16,661&nbsp;shares of common stock issued to Thomas J.
    Sikorski in his capacity as a director of Quanta.
    Mr.&nbsp;Sikorski is no longer a director of Quanta. GP Inc. may
    be deemed to beneficially own the aforementioned shares and
    options issued to Ben A. Guill and Thomas J. Sikorski.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD><FONT size="2">(3)&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">This percentage is obtained by using as the
    denominator 116,207,418&nbsp;shares of common stock, comprised
    of 116,192,418&nbsp;shares of common stock outstanding as of
    December&nbsp;9, 2004 and options to
    purchase&nbsp;15,000&nbsp;shares issued to Ben A. Guill in his
    capacity as a director of Quanta.
    </FONT></TD>
</TR>

</TABLE>

<P align="center"><FONT size="2">S-6
</FONT>
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV align="left">
<A name='110'></A>
</DIV>

<!-- link1 "<FONT size="2">DESCRIPTION OF CAPITAL STOCK</FONT>" -->

<P align="center">
<B><FONT size="2">DESCRIPTION OF CAPITAL STOCK</FONT></B>

<P align="left">
<B><FONT size="2">General</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Under our certificate of incorporation, our
authorized capital stock consists of 300,000,000&nbsp;shares of
common stock, par value $.00001&nbsp;per share,
3,345,333&nbsp;shares of limited vote common stock, par value
$.00001&nbsp;per share, and 10,000,000&nbsp;shares of preferred
stock, par value $.00001&nbsp;per share. As of December&nbsp;9,
2004, there were 116,192,418&nbsp;shares of common stock, and
1,011,780&nbsp;shares of limited vote common stock, issued and
outstanding. As of the date of this prospectus supplement, we
have no preferred stock outstanding.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The following description of our capital stock is
subject to our certificate of incorporation, bylaws, stockholder
rights plan and the applicable provisions of Delaware law.
</FONT>

<P align="left">
<B><FONT size="2">Common stock and limited vote common
stock</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Holders of common stock are entitled to one vote
for each share held of record on all matters on which
stockholders are entitled or permitted to vote, including the
election of directors. There is no cumulative voting for the
election of directors.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Holders of limited vote common stock are entitled
to elect one member of our board of directors but are not
otherwise entitled to vote on the election of directors. Holders
of limited vote common stock are entitled to one-tenth of one
vote for each share held of record on all other matters on which
stockholders are entitled or permitted to vote.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Subject to preferences that may be applicable to
any outstanding shares of preferred stock, holders of common
stock and limited vote common stock are entitled to receive
dividends, on a pro rata basis, when and as declared by the
board of directors out of legally available funds. In the event
of our liquidation, dissolution or winding up, holders of common
stock and limited vote common stock are entitled to share
ratably in all assets remaining after payment of liabilities and
the liquidation preferences of any then outstanding shares of
preferred stock. Holders of common stock and limited vote common
stock have no preemptive rights. Shares of common stock are not
subject to any redemption provisions and are not convertible
into any of our other securities. Shares of limited vote common
stock are not subject to any redemption provisions and are not
convertible into any other securities, except that each share of
limited vote common stock will automatically convert into common
stock on a share-for-share basis immediately upon a sale of such
shares.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our common stock is traded on the NYSE under the
symbol &#147;PWR&#148; and the transfer agent and registrar for
our common stock is American Stock Transfer&nbsp;&#38;
Trust&nbsp;Company.
</FONT>

<P align="left">
<B><FONT size="2">Preferred stock</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our certificate of incorporation authorizes our
board of directors to provide for the issuance of preferred
stock in one or more series, without stockholder action. Our
board of directors is authorized to fix the designation, powers,
preferences and rights, and the qualifications, limitations and
restrictions of the shares of each series of preferred stock we
issue. For each series of preferred stock, our board is able to
specify the following:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the designation of each series;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the number of shares of each series;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the rate of any dividends;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">whether any dividends shall be cumulative or
    non-cumulative;
    </FONT></TD>
</TR>

</TABLE>

<P align="center"><FONT size="2">S-7
</FONT>

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<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the terms of any redemption rights;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">whether there will be any sinking fund for the
    redemption of any shares;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the terms of any conversion or exchange right;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">any restrictions or limitations on the issuance
    of shares of the same series or any other series;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the amount payable in the event of any voluntary
    or involuntary liquidation, dissolution or winding up of our
    company;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the extent to which holders of the shares will be
    entitled to vote.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Although no shares of preferred stock are
currently outstanding and we have no current plans to issue
preferred stock, except for such shares of Series&nbsp;D Junior
Participating Preferred Stock issuable upon exercise of the
rights under our stockholder rights plan, the issuance of shares
of our preferred stock, or the issuance of rights to purchase
shares of our preferred stock, could be used to discourage an
unsolicited acquisition proposal. For example, we could impede a
business combination by issuing a series of our preferred stock
containing class voting rights that would enable the holder or
holders of such series to block that transaction. Alternatively,
we could facilitate a business combination by issuing a series
of our preferred stock having sufficient voting rights to
provide a required percentage vote of the stockholders. In
addition, under some circumstances, the issuance of preferred
stock could adversely affect the voting power and other rights
of the holders of our common stock. Although our board is
required to make any determination to issue any preferred stock
based on its judgment as to the best interests of our
stockholders, it could act in a manner that would discourage an
acquisition attempt or other transaction that some, or a
majority, of our stockholders might believe to be in their best
interests or in which stockholders might receive a premium for
their stock over prevailing market prices of the stock. Our
board does not at present intend to seek stockholder approval
prior to any issuance of currently authorized stock unless
otherwise required by law or applicable stock exchange
requirements.
</FONT>

<P align="left">
<B><FONT size="2">First Reserve&#146;s preemptive
rights</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">In October 2002 we entered into an
Investor&#146;s Rights Agreement with First Reserve pursuant to
which we granted First Reserve a preemptive right to purchase,
on a quarterly basis, a proportionate number of shares of our
common stock to allow it to maintain the same voting percentage
of our common stock that it had prior to the issuance during any
quarter of our common stock or securities convertible into
common stock to third parties. First Reserve&#146;s purchase
price for each share of our common stock purchased pursuant to
this right equals the closing price per share of our common
stock on the date of issuance of the shares of common stock to
third parties. First Reserve has fifteen business days after the
end of any quarter in which we issue new shares of common stock
or securities convertible into common stock to exercise its
preemptive right with respect to issuances during the quarter.
First Reserve&#146;s preemptive right will terminate if First
Reserve&#146;s voting percentage is less than 10%.
</FONT>

<P align="left">
<B><FONT size="2">Series&nbsp;D Junior Participating Preferred
Stock</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Shares of Series&nbsp;D Junior Preferred Stock
purchasable upon exercise of the rights described below under
&#147;&#151;Stockholder Rights Plan&#148; will not be redeemable
or convertible. Shares of Series&nbsp;D Junior Preferred Stock
will be entitled to cumulative dividends equal to the greater of
$10&nbsp;per share or, subject to adjustment, an aggregate
dividend of 1,000 times the dividend declared per share of
common stock for any quarterly period. In the event of our
liquidation, dissolution or winding up, the holders of the
Series&nbsp;D Junior Preferred Stock will be entitled to a
minimum preferential payment of $1,000&nbsp;per share plus
accrued and unpaid dividends, whether or not declared, provided
that the holders of the shares of Series&nbsp;D Junior Preferred
Stock shall be entitled to an aggregate payment per share,
subject to adjustment, of 1,000 times the aggregate amount
distributed per share to holders of common stock. In the event
of any merger,
</FONT>

<P align="center"><FONT size="2">S-8
</FONT>

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<DIV align="left">
<FONT size="2">consolidation or similar transaction in which
shares of common stock are exchanged, each share of
Series&nbsp;D Junior Preferred Stock will be entitled to
receive, subject to adjustment, 1,000 times the amount received
per share of common stock. Each holder of a share of
Series&nbsp;D Junior Preferred Stock will have 1,000 votes on
all matters submitted to a vote of stockholders and will vote
together with the holders of our common stock. These rights are
protected by customary anti-dilution provisions. Due to the
nature of the Series&nbsp;D Junior Preferred Stock dividend,
liquidation and voting rights, the value of the one
one-thousandth interest in a share of Series&nbsp;D Junior
Preferred Stock purchasable upon exercise of each right should
approximate the value of one share of common stock.
</FONT>
</DIV>

<P align="left">
<B><FONT size="2">Stockholder rights plan</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We have adopted a stockholder rights plan
pursuant to which one right will be issued and attached to each
outstanding share of common stock. The following description of
our stockholder rights plan and the certificate of designations
setting forth the terms and conditions of the Series&nbsp;D
Junior Preferred Stock are intended as summaries only and are
qualified in their entirety by reference to the form of
stockholder rights plan and certificate of designations to the
certificate of incorporation filed with the SEC.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Until a distribution date occurs, the rights can
be transferred only with the common stock. On the occurrence of
a distribution date, the rights will separate from the common
stock and become exercisable as described below.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">A &#147;distribution date&#148; will occur upon
the earlier of:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the tenth day after a public announcement that a
    person or group of affiliated or associated persons other than
    us and certain exempt persons (an &#147;acquiring person&#148;)
    has acquired beneficial ownership of 15% or more of the total
    voting rights of the then outstanding shares of our common stock
    (or, in the case of First Reserve, 37% or more of the total
    voting rights);&nbsp;or
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the tenth business day following the commencement
    of a tender or exchange offer that would result in such person
    or group becoming an acquiring person.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The total voting rights of the common stock will
be determined based on the voting rights of holders of
outstanding shares of our common stock at the time of any
determination.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Following the distribution date, holders of
rights will be entitled to purchase from us one one-thousandth
(1/1000th) of a share of Series&nbsp;D Junior Preferred Stock at
a purchase price of $153.33, subject to adjustment.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">In the event that any person or group becomes an
acquiring person, proper provision shall be made so that each
holder of a right, other than rights beneficially owned by the
acquiring person, will thereafter have the right to receive upon
payment of the purchase price, that number of shares of common
stock having a market value equal to the result obtained by
(A)&nbsp;multiplying the then current purchase price by the
number of one one-thousandths of a share of Series&nbsp;D Junior
Preferred Stock for which the right is then exercisable, and
dividing that product by (B)&nbsp;50% of the current per share
market price of our shares of common stock on the date of such
occurrence. If, following the date of a public announcement that
an acquiring person has become such, (1)&nbsp;we are acquired in
a merger or other business combination transaction and we are
not the surviving corporation, (2)&nbsp;any person consolidates
or merges with us and all or part of the common stock is
converted or exchanged for securities, cash or property of any
other person, or (3)&nbsp;50% or more of our assets or earning
power is sold or transferred, then the rights will
&#147;flip-over.&#148; At that time, each right will entitle its
holder to purchase, for the purchase price, a number of shares
of common stock of the surviving entity in any such merger,
consolidation or other business combination or the purchaser in
any such sale or transfer with a market value equal to the
result obtained by (X)&nbsp;multiplying the then current
purchase price by the number of one one-thousandths of a share of
</FONT>

<P align="center"><FONT size="2">S-9
</FONT>

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<DIV align="left">
<FONT size="2">Series&nbsp;D Junior Preferred Stock for which
the right is then exercisable, and dividing that product by
(Y)&nbsp;50% of the current per share market price of the shares
of common stock of the surviving entity on the date of
consummation of such consolidation, merger, sale or transfer.
</FONT>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The rights will expire on March&nbsp;8, 2010,
unless we terminate them before that time. Our board of
directors may redeem all of the rights upon payment of
$0.01&nbsp;per right until the earlier of:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">a &#147;flip-in event;&#148;&nbsp;or
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">March&nbsp;8, 2010.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">If our board redeems any of the rights, it must
redeem all of the rights. Once our board acts to redeem the
rights, the right to exercise the rights will terminate and each
right will become null and void.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">A holder of a right will not have any rights as a
stockholder of Quanta, including the right to vote or to receive
dividends, until a right is exercised.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">At any time prior to the occurrence of a
redemption date, we may, except with respect to the redemption
price, supplement or amend any provision of our stockholder
rights plan in any manner, whether or not such supplement or
amendment is adverse to any holders of the rights. From and
after the occurrence of a redemption date, we may, except with
respect to the redemption price, supplement or amend our
stockholder rights plan in any manner that does not adversely
affect the interests of the holders of rights, other than an
acquiring person.
</FONT>

<P align="left">
<B><FONT size="2">Delaware law and specified charter and bylaw
provisions</FONT></B>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD><B><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></B></TD>
    <TD>
    <B><I><FONT size="2">Business combinations</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We are subject to the provisions of
section&nbsp;203 of the Delaware General Corporation Law.
Section&nbsp;203 prohibits a publicly held Delaware corporation
from engaging in a &#147;business combination&#148; with an
&#147;interested stockholder&#148; for a period of three years
after the date of the transaction in which the person became an
interested stockholder, unless the business combination is, or
the transaction by which such stockholder became an
&#147;interested stockholder&#148; was, approved in a prescribed
manner. A &#147;business combination&#148; includes mergers,
asset sales and other transactions resulting in a financial
benefit to the interested stockholder. Subject to specified
exceptions, an &#147;interested stockholder&#148; is a person
who, together with affiliates and associates, owns, or within
three years did own, 15% or more of the corporation&#146;s
voting stock.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD><B><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></B></TD>
    <TD>
    <B><I><FONT size="2">Limitation of liability;
    indemnification</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our charter contains provisions permitted under
the Delaware General Corporation Law relating to the liability
of directors. The provisions eliminate a director&#146;s
liability for monetary damages for a breach of fiduciary duty,
except in circumstances involving wrongful acts, such as the
breach of a director&#146;s duty of loyalty, acts or omissions
that involve intentional misconduct or a knowing violation of
law or transactions from which the director derived an improper
personal benefit. This limitation of liability does not alter
the liability of our directors and officers under federal
securities laws. Furthermore, our bylaws contain provisions to
indemnify our directors and officers to the fullest extent
permitted by the Delaware General Corporation Law. These
provisions do not limit or eliminate our right or the right of
any of our stockholders to seek non-monetary relief, such as an
injunction or rescission in the event of a breach by a director
or an officer of his or her duty of care. We believe that these
provisions will assist us in attracting and retaining qualified
individuals to serve as directors.
</FONT>

<P align="center"><FONT size="2">S-10
</FONT>

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<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD><B><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></B></TD>
    <TD>
    <B><I><FONT size="2">Stockholder action; special meeting of
    stockholders</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our certificate of incorporation provides that
stockholders may take action only at a duly called annual or
special meeting of stockholders and may not act by written
consent. Our bylaws further provide that special meetings of our
stockholders may be called only by the chairman of the board of
directors pursuant to a resolution approved by a majority of the
board of directors.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD><B><FONT size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></B></TD>
    <TD>
    <B><I><FONT size="2">Advance notice requirements for stockholder
    proposals and director nominations</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our bylaws provide that stockholders seeking to
bring business before an annual meeting of stockholders, or to
nominate candidates for election as directors at an annual
meeting of stockholders, must meet specified procedural
requirements. These provisions may preclude stockholders from
bringing matters before an annual meeting of stockholders or
from making nominations for directors at an annual or special
meeting of stockholders.
</FONT>

<P align="center"><FONT size="2">S-11
</FONT>

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<DIV align="left">
<A name='111'></A>
</DIV>

<!-- link1 "<FONT size="2">UNDERWRITING</FONT>" -->

<P align="center">
<B><FONT size="2">UNDERWRITING</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">J.P.&nbsp;Morgan Securities Inc. is the sole
underwriter of this offering. Subject to the terms and
conditions contained in the underwriting agreement, dated
December&nbsp;9, 2004, the selling stockholder identified in
this prospectus supplement has agreed to sell to JPMorgan, and
JPMorgan has agreed to purchase, 3,692,000 of our shares of
common stock currently held by such selling stockholder.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The underwriting agreement provides that JPMorgan
is obligated to purchase all the shares of common stock in the
offering if any are purchased.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">JPMorgan is offering the shares of common stock,
subject to prior sale, when, as and if sold to and accepted by
it, subject to approval of legal matters by its counsel,
including the validity of the shares, and other conditions
contained in the underwriting agreement, such as the receipt by
JPMorgan of officers&#146; certificates and legal opinions.
JPMorgan reserves the right to withdraw, cancel or modify offers
to the public and to reject orders in whole or in part.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The following table shows the public offering
price, underwriting discount and proceeds to the selling
stockholder from the sale of common stock.
</FONT>

<CENTER>
<TABLE width="70%" align="center" cellspacing="0" cellpadding="0" border="0">

<TR>
    <TD width="70%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="6%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="6%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Per share</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Total</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Public offering price
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">7.15</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">26,397,800</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Underwriting discount
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">0.15</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">553,800</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR valign="bottom" bgcolor="#EEEEEE">
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">Proceeds, before expenses, to the selling
    stockholder
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">7.00</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom"><FONT size="2">$</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">25,844,000</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

</TABLE>
</CENTER>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The expenses of the offering payable by us are
estimated at $100,000.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We and the selling stockholder have each agreed,
subject to limited exceptions, that, for a period of
45&nbsp;days from the date of this prospectus supplement, we and
they will not, without the prior written consent of JPMorgan,
offer, sell, contract to sell, pledge or otherwise dispose of
any shares of our common stock or any securities convertible
into or exchangeable for our common stock. Our four executive
officers who hold the largest number of shares of our common
stock have agreed to a similar lock-up period with JPMorgan for
a period of 45&nbsp;days from the date of this prospectus
supplement, and certain of our other executive officers and
directors have agreed to a similar lock-up period with JPMorgan
for a period of 30&nbsp;days from the date of this prospectus
supplement. JPMorgan, in its sole discretion, may release any of
the securities subject to these lock-up agreements at any time
without notice.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We and the selling stockholder have agreed to
indemnify JPMorgan against certain liabilities, including
liabilities under the Securities Act of 1933 or to contribute to
payments that JPMorgan may be required to make in respect of
those liabilities.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">In order to facilitate this offering, JPMorgan
may engage in transactions that stabilize, maintain or otherwise
affect the price of our common stock. Specifically, JPMorgan may
sell more shares than it is obligated to purchase under the
underwriting agreement, creating a short position. JPMorgan must
close out a short sale by purchasing shares in the open market.
As an additional means of facilitating the offering, JPMorgan
may bid for, and purchase, shares of common stock in the open
market to stabilize the price of the common stock. Any of these
activities may stabilize or maintain the market price of our
common stock. JPMorgan is not required to engage in these
activities, and may end any of these activities at any time.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The common shares are listed on the New York
Stock Exchange under the symbol &#147;PWR.&#148;
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">In the ordinary course of their respective
businesses, JPMorgan and its affiliates have engaged, and may in
the future engage, in commercial and/or investment banking
transactions with us and our affiliates.
</FONT>

<P align="center"><FONT size="2">S-12
</FONT>
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<DIV align="left">
<FONT size="2">They have received customary fees and commissions
for these transactions. JPMorgan acted as a joint book-running
manager in connection with the September 2004 offering by the
selling stockholder of our common stock.
</FONT>
</DIV>

<DIV align="left">
<A name='112'></A>
</DIV>

<!-- link1 "<FONT size="2">LEGAL MATTERS</FONT>" -->

<P align="center">
<B><FONT size="2">LEGAL MATTERS</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Baker&nbsp;&#38; Hostetler LLP has passed upon
the validity of the common stock offered hereby on behalf of
Quanta. Vinson&nbsp;&#38; Elkins L.L.P. represented the
underwriter in this offering.
</FONT>

<DIV align="left">
<A name='113'></A>
</DIV>

<!-- link1 "<FONT size="2">EXPERTS</FONT>" -->

<P align="center">
<B><FONT size="2">EXPERTS</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The consolidated financial statements of Quanta
as of and for each of the two years in the period ended
December&nbsp;31, 2003, incorporated in this prospectus
supplement and the accompanying prospectus by reference to the
Annual Report on Form&nbsp;10-K for the year ended
December&nbsp;31, 2003, have been so incorporated in reliance on
the report of PricewaterhouseCoopers LLP, an independent
registered public accounting firm, given on the authority of
said firm as experts in auditing and accounting.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">PricewaterhouseCoopers LLP&#146;s report refers
to the adoption of the provisions of Statement of Financial
Accounting Standards No.&nbsp;142, &#147;Goodwill and Other
Intangible Assets,&#148; and to its audit of the transitional
disclosures for 2001, as more fully described in Note&nbsp;2 to
the financial statements. However, PricewaterhouseCoopers LLP
was not engaged to audit, review or apply any procedures to the
2001 consolidated financial statements other than with respect
to such disclosures.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The consolidated financial statements of Quanta
as of and for the year ended December&nbsp;31, 2001, from our
Annual Report on Form&nbsp;10-K for the year ended
December&nbsp;31, 2003, incorporated by reference in this
prospectus supplement and the accompanying prospectus, have been
audited by Arthur Andersen LLP, independent accountants, as
stated in their reports appearing therein, and are incorporated
by reference herein in reliance upon the authority of said firm
as experts in auditing and accounting.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Subsequent to Arthur Andersen&#146;s completion
of our 2001 audit, the firm was convicted of obstruction of
justice charges, has ceased practicing before the SEC, and has
liquidated its business. As a result, it is impossible to obtain
Arthur Andersen&#146;s consent to the incorporation by reference
of their reports in this prospectus supplement and the
accompanying prospectus, and we have dispensed with the
requirement to file their consent in reliance upon
Rule&nbsp;437a under the Securities Act of 1933. Because Arthur
Andersen has not consented to the incorporation by reference of
their reports in this prospectus supplement and the accompanying
prospectus, you would not be able to recover against Arthur
Andersen for its liability under Section&nbsp;11 of the
Securities Act in the event of any untrue statements of a
material fact contained in the financial statements audited by
Arthur Andersen or any omissions to state a material fact
required to be stated therein.
</FONT>

<DIV align="left">
<A name='114'></A>
</DIV>

<!-- link1 "<FONT size="2">WHERE YOU CAN FIND MORE INFORMATION</FONT>" -->

<P align="center">
<B><FONT size="2">WHERE YOU CAN FIND MORE INFORMATION</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We file annual, quarterly and current reports,
proxy statements and other information with the SEC. You can
read and copy any materials we file with the SEC at its Public
Reference Room at 450&nbsp;Fifth Street, N.W.,
Washington,&nbsp;D.C. 20549. You can obtain information about
the operation of the SEC&#146;s Public Reference Room by calling
the SEC at 1-800-SEC-0330. Copies can be obtained from the SEC
upon payment of the prescribed fees. The SEC also maintains a
web site that contains information we file electronically with
the SEC, which you can access over the Internet at
http://www.sec.gov. In addition, you can obtain information
about us at the offices of the New York Stock Exchange at
20&nbsp;Broad Street, New York, New York 10005.
</FONT>

<P align="center"><FONT size="2">S-13
</FONT>

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<P align="left">
<A name='115'></A>

<!-- link1 "<FONT size="2">INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE</FONT>" -->

<P align="center">
<B><FONT size="2">INCORPORATION OF CERTAIN DOCUMENTS BY
REFERENCE</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We &#147;incorporate by reference&#148; into this
prospectus supplement and the accompanying prospectus certain
information we file with the SEC, which means that we can
disclose important information to you by referring you to those
documents. The information incorporated by reference is
considered to be part of this prospectus supplement and the
accompanying prospectus. Any statement made in a document
incorporated by reference in this prospectus supplement and the
accompanying prospectus is deemed to be modified or superseded
for purposes of this prospectus supplement and the accompanying
prospectus to the extent that a statement in this prospectus
supplement and the accompanying prospectus or in any other
subsequently filed document, which is also incorporated by
reference, modifies or supersedes the statement. Any statement
made in this prospectus supplement and the accompanying
prospectus is deemed to be modified or superseded to the extent
a statement in any subsequently filed document, which is
incorporated by reference in this prospectus supplement and the
accompanying prospectus, modifies or supersedes such statement.
Any statement so modified or superseded will not be deemed,
except as so modified or superseded, to constitute a part of
this prospectus supplement and the accompanying prospectus.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We incorporate by reference the filings listed
below, which have previously been filed with the SEC, and any
future filings made with the SEC prior to the termination of
this offering under Sections&nbsp;13(a), 13(c),&nbsp;14, or
15(d) of the Exchange Act (other than current reports furnished
under Item&nbsp;2.02 or Item&nbsp;7.01 of Form&nbsp;8-K unless
specifically incorporated by reference by us). All of these
filings, which contain important information about us, are
considered a part of this prospectus supplement and the
accompanying prospectus.
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Our annual report on Form&nbsp;10-K for the year
    ended December&nbsp;31, 2003, filed on March&nbsp;15, 2004.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Our quarterly report on Form&nbsp;10-Q for the
    quarter ended March&nbsp;31, 2004, filed on May&nbsp;10, 2004.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Our quarterly report on Form&nbsp;10-Q for the
    quarter ended June&nbsp;30, 2004, filed on August&nbsp;9, 2004.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Our quarterly report on Form&nbsp;10-Q for the
    quarter ended September&nbsp;30, 2004, filed on November&nbsp;9,
    2004.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Our current reports on Form&nbsp;8-K, filed on
    September&nbsp;21, 2004 (under Item&nbsp;8.01), October&nbsp;1,
    2004, November&nbsp;30, 2004 and December&nbsp;7, 2004.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">The description of our common stock contained in
    our registration statement on Form&nbsp;8-A/A, filed on
    February&nbsp;6, 1998.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">You may obtain copies of documents incorporated
by reference in this document, without charge, by writing to us
at the following address or calling us at the telephone number
listed below:
</FONT>

<P align="center">
<FONT size="2">Quanta Services, Inc.
</FONT>

<DIV align="center">
<FONT size="2">1360 Post Oak Boulevard, Suite&nbsp;2100
</FONT>
</DIV>

<DIV align="center">
<FONT size="2">Houston, Texas 77056
</FONT>
</DIV>

<DIV align="center">
<FONT size="2">(713)&nbsp;629-7600
</FONT>
</DIV>

<DIV align="center">
<FONT size="2">Attention: Corporate Secretary
</FONT>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We have filed with the SEC registration
statements on Form&nbsp;S-3 under the Securities Act covering
the shares of common stock to be offered and sold by this
prospectus supplement and the accompanying prospectus. This
prospectus supplement and the accompanying prospectus do not
contain all of the information included in the registration
statements, some of which is contained in exhibits to the
registration statements. The registration statements, including
the exhibits, can be read at the SEC web site or at the SEC
offices referred to above. Any statement made or incorporated by
reference into this
</FONT>

<P align="center"><FONT size="2">S-14
</FONT>

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<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV align="left">
<FONT size="2">prospectus supplement and the accompanying
prospectus concerning the contents of any contract, agreement or
other document is only a summary of the actual contract,
agreement or other document. If we have filed any contract,
agreement or other document as an exhibit to either registration
statement, you should read the exhibit for a more complete
understanding of the document or matter involved.
</FONT>
</DIV>

<P align="center"><FONT size="2">S-15
</FONT>
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<DIV align="right">
<B><FONT size="2">Filed pursuant to
Rule&nbsp;424(b)(3)</FONT></B>
</DIV>

<DIV align="right">
<B><FONT size="2">Registration No.&nbsp;333-114938</FONT></B>
</DIV>

<DIV align="left">
<B><FONT size="2">PROSPECTUS</FONT></B>
</DIV>

<P align="center">
<B><FONT size="6">Quanta Services, Inc.</FONT></B>

<P align="center">
<B><FONT size="4">20,000,000&nbsp;shares of common
stock</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">This prospectus includes 20,000,000&nbsp;shares
of common stock that are currently outstanding. All of these
shares were issued and sold pursuant to private placements to
the selling stockholder listed on page&nbsp;9 of this
prospectus. We are registering these shares of common stock
pursuant to commitments to register the shares with the selling
stockholder.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We will not receive any proceeds from the sale of
shares of common stock by the selling stockholder. The selling
stockholder may sell the shares at prices determined by the
prevailing market price for the shares or in negotiated
transactions. The selling stockholder may also sell the shares
to or with the assistance of broker-dealers who may receive
compensation in excess of their customary commissions.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our common stock is quoted on The New York Stock
Exchange under the symbol &#147;PWR.&#148; On June&nbsp;30,
2004, the last reported sales price of our common stock on The
New York Stock Exchange was $6.22&nbsp;per share.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We will pay the expenses of registering the
shares.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<B><FONT size="2">You should carefully consider the &#147;Risks
of Investing in Our Shares&#148; section beginning on
page&nbsp;3 of this prospectus.</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<B><FONT size="2">Neither the Securities and Exchange Commission
nor any state securities commission has approved or disapproved
of these securities or determined if this prospectus is truthful
or complete. Any representation to the contrary is a criminal
offense.</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">You should only rely on the information
incorporated by reference or provided in this prospectus or any
supplement. We have not authorized anyone else to provide you
with different information. You should not assume that the
information in this prospectus or any supplement is accurate as
of any date other than the date on the front of those documents.
</FONT>

<P align="center">
<B><FONT size="2">The date of this prospectus is June&nbsp;30,
2004.</FONT></B>

<!-- PAGEBREAK -->
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<DIV align="left">

</DIV>

<DIV align="left">
<!-- TOC -->
</DIV>

<DIV align="left">
<A name="tocpage"></A>
</DIV>

<P align="center">
<B><FONT size="2">TABLE OF CONTENTS</FONT></B>

<CENTER>
<TABLE width="60%" align="center" cellspacing="0" cellpadding="0" border="0">

<TR>
    <TD width="93%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#123'>Special Note Regarding
    Forward-Looking Statements</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">i</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#124'>Summary</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">1</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#125'>Risks of Investing in Our
    Shares</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">3</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#126'>Proceeds from the Sale of
    Shares</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">9</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#127'>Selling Stockholder</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">9</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#128'>How the Shares May Be
    Distributed</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">11</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#129'>Legal Matters</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">12</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#130'>Experts</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">12</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#131'>Where You Can Find More
    Information</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">13</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">&nbsp;<A HREF='#132'>Incorporation of Certain
    Documents by Reference</A>
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">13</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

</TABLE>
</CENTER>

<DIV align="left">
<!-- /TOC -->
</DIV>

<DIV align="left">
<A name='123'></A>
</DIV>

<!-- link1 "<FONT size="2">SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS</FONT>" -->

<P align="center">
<B><FONT size="2">SPECIAL NOTE REGARDING FORWARD-LOOKING
STATEMENTS</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">This prospectus includes statements reflecting
assumptions, expectations, projections, intentions or beliefs
about future events that are intended as &#147;forward-looking
statements&#148; under the Private Securities Litigation Reform
Act of 1995. You can identify these statements by the fact that
they do not relate strictly to historical or current facts. They
use words such as &#147;anticipate,&#148; &#147;estimate,&#148;
&#147;project,&#148; &#147;forecast,&#148; &#147;may,&#148;
&#147;will,&#148; &#147;should,&#148; &#147;could,&#148;
&#147;expect,&#148; &#147;believe&#148; and other words of
similar meaning. In particular, these include, but are not
limited to, statements relating to the following:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">projected operating or financial results;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">expectations regarding capital expenditures;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the effects of competition in our markets;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the duration and extent of the current economic
    downturn;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to achieve cost savings.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Any or all of our forward-looking statements may
turn out to be wrong. They can be affected by inaccurate
assumptions and by known or unknown risks and uncertainties,
including the following:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">quarterly variations in our operating results due
    to seasonality and adverse weather conditions;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the future possibility of an economic downturn;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our dependence on fixed price contracts;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">materially adverse changes in economic conditions
    in the markets served by us or by our customers;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">rapid technological and structural changes that
    could reduce the demand for the services we provide;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to effectively compete for market
    share;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">cancellation provisions within our contracts;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">potential liabilities relating to occupational
    health and safety matters;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">retention of key personnel and qualified
    employees;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the impact of our unionized workforce on our
    operations and acquisition strategy;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our growth outpacing our infrastructure;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">potential exposure to environmental liabilities;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the cost of borrowing, availability of credit,
    debt covenant compliance and other factors affecting our
    financing activities;
    </FONT></TD>
</TR>

</TABLE>

<P align="center">
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<P>

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<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to generate internal growth;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the adverse impact of goodwill impairments;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">replacement of our contracts as they are
    completed or expire;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our ability to effectively integrate the
    operations of our companies;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">beliefs and assumptions about the collectibility
    of receivables;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">beliefs or assumptions about the outlook for
    markets we serve;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the other risks and uncertainties as are
    described under &#147;Risks of Investing In Our Shares&#148; and
    as may be detailed from time to time in our public filings with
    the Securities and Exchange Commission (SEC).
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Many of these factors will be important in
determining our actual future results. Consequently, no
forward-looking statement can be guaranteed. Our actual future
results may vary materially from those expressed or implied in
any forward-looking statements.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">All of our forward-looking statements, whether
written or oral, are expressly qualified by these cautionary
statements and any other cautionary statements that may
accompany such forward-looking statements. In addition, we
disclaim any obligation to update any forward-looking statements
to reflect events or circumstances after the date of this
prospectus.
</FONT>

<P align="center"><FONT size="2">ii
</FONT>

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<DIV style="width: 100%; border: 1px solid black; padding: 12px;">

<DIV align="left">
<A name='124'></A>
</DIV>

<!-- link1 "<FONT size="2">SUMMARY</FONT>" -->

<P align="center">
<B><FONT size="2">SUMMARY</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<I><FONT size="2">The following summary provides an overview of
selected information about us. This summary is qualified in its
entirety by the more detailed information, including our
consolidated financial statements and related notes thereto,
incorporated by reference in this prospectus. You should
carefully consider this entire prospectus, including the
&#147;Risks of Investing In Our Shares&#148; section, before
making an investment decision.</FONT></I>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Quanta is a leading provider of specialized
contracting services, offering end-to-end network solutions to
the electric power, gas, telecommunications and cable television
industries. Our comprehensive services include designing,
installing, repairing and maintaining network infrastructure.
Since Quanta began operations, we have made strategic
acquisitions to expand our geographic presence, generate
operating synergies with existing businesses and develop new
capabilities to meet our customers&#146; evolving needs. For the
year ended December&nbsp;31, 2003, our end markets provided the
following percentages of our revenues:
</FONT>
<P>

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    <TD width="1%"></TD>
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</TR>

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    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Electric power and natural gas (60%)
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Telecommunications (15%)
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Cable television operators (7%)
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Ancillary services, including industrial,
    commercial and governmental customers (18%)
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our primary services capabilities include the
following:
</FONT>
<P>

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    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Repair
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Maintenance
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Installation
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Emergency Response
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Design
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Specialty Services
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Within the electric power and natural gas end
markets, services we provide include: installation, repair and
maintenance of electric power distribution networks, electric
transmission lines and natural gas distribution systems; design
and construction of substation projects; and storm damage
restoration work. Within the telecommunications and cable
television end markets, services we provide include: fiber
optic, copper and coaxial cable installation and maintenance for
video, data and voice transmission; design, construction and
maintenance of DSL networks and switching systems; engineering
and erection of wireless communications towers; and residential
installation and customer connects for cable television,
telephone and Internet services.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We were founded in 1997 and began as a group of
infrastructure services companies led by our Chief Executive
Officer, John Colson. We completed our initial public offering
in 1998 and since that time have expanded our geographic
coverage and service capabilities through acquisitions and
internal growth. Our operating structure allows for the
flexibility of multiple operating units with the benefit of an
organization with scale. Our units are managed on a
decentralized basis, with units operated as individual profit
centers. To leverage our scale and geographic reach, our
operating units have incentives to cross-sell additional
services of other operating units to customers. In addition, our
business development group promotes and markets our services for
prospective large national accounts and projects that require
services from multiple business units.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">During 2002 and 2003, we took several actions to
reduce costs. We conducted a comprehensive cost evaluation
program the scope of which ranged from equipment utilization to
cell phone expenses and has resulted in cost reductions at our
units. In addition, we consolidated various operations where
there were operational or regional synergies. We reduced salary
and benefit costs through staff reductions at several levels of
the organization and increased utilization of hourly employees.
</FONT>
</DIV>

<P align="center"><FONT size="2">1
</FONT>

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<DIV style="width: 100%; border: 1px solid black; padding: 12px;">

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Financial and economic pressures have led our
customers to return to their core competencies and focus on cost
reductions, resulting in an increased focus on outsourcing
services. We believe that we are adequately positioned to
provide these services because of our proven full-service
operating units with broad geographic reach, financial
capability and technical expertise.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Quanta is a Delaware corporation and our common
stock is traded on The New York Stock Exchange under the symbol
&#147;PWR.&#148; Our principal executive offices are located at
1360 Post Oak Boulevard, Suite&nbsp;2100, Houston, Texas 77056,
and our telephone number is (713)&nbsp;629-7600. We maintain a
website at www.quantaservices.com. Information on our website
does not constitute a part of this prospectus.
</FONT>
</DIV>

<P align="center"><FONT size="2">2
</FONT>

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<DIV align="left">
<A name='125'></A>
</DIV>

<!-- link1 "<FONT size="2">RISKS OF INVESTING IN OUR SHARES</FONT>" -->

<P align="center">
<B><FONT size="2">RISKS OF INVESTING IN OUR SHARES</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">You should consider the following risk factors,
in addition to the other information presented in this
prospectus and the documents incorporated by reference in this
prospectus, in evaluating us, our business and an investment in
the common stock. Any of the following risks, as well as other
risks and uncertainties, could seriously harm our business and
financial results and cause the value of the common stock to
decline, which in turn could cause you to lose all or part of
your investment.
</FONT>

<DIV>&nbsp;</DIV>

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    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">Our operating results may vary
    significantly from quarter to quarter.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We experience lower gross and operating margins
during winter months due to lower demand for our services and
more difficult operating conditions. Additionally, our quarterly
results may also be materially and adversely affected by:
</FONT>
<P>

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    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the timing and volume of work under new
    agreements;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">regional or general economic conditions;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the budgetary spending patterns of customers;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">payment risk associated with the financial
    condition of customers;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">variations in the margins of projects performed
    during any particular quarter;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the termination of existing agreements;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">costs we incur to support growth internally or
    through acquisitions or otherwise;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">losses experienced in our operations not
    otherwise covered by insurance;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">a change in the demand for our services caused by
    severe weather conditions;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">a change in the mix of our customers, contracts
    and business;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">increases in construction and design costs;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">changes in bonding and lien requirements
    applicable to existing and new agreements;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the timing of acquisitions;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">the timing and magnitude of acquisition
    integration costs.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Accordingly, our operating results in any
particular quarter may not be indicative of the results that you
can expect for any other quarter or for the entire year.
</FONT>

<DIV>&nbsp;</DIV>

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<TR>
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    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">An economic downturn may lead to less
    demand for our services.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">If the general level of economic activity remains
slow or deteriorates further, our customers may delay or cancel
new projects. The telecommunications and utility markets
experienced substantial change during 2002 as evidenced by an
increased number of bankruptcies in the telecommunications
market, continued devaluation of many of our customers&#146;
debt and equity securities and pricing pressures resulting from
challenges faced by major industry participants. These factors
have contributed to the delay and cancellation of projects and
reduction of capital spending that have impacted our operations
and ability to grow at historical levels. A number of other
factors, including financing conditions for and potential
bankruptcies in the industries we serve, could adversely affect
our customers and their ability or willingness to fund capital
expenditures in the future or pay for past services. In
addition, consolidation, competition or capital constraints in
the electric power, gas, telecommunications or cable television
industries may result in reduced spending by, or the loss of,
one or more of our customers.
</FONT>

<P align="center"><FONT size="2">3
</FONT>

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<DIV>&nbsp;</DIV>

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<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">Our dependence upon fixed price contracts
    could adversely affect our business.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We currently generate, and expect to continue to
generate, a portion of our revenues under fixed price contracts.
We must estimate the costs of completing a particular project to
bid for fixed price contracts. The cost of labor and materials,
however, may vary from the costs we originally estimated. These
variations, along with other risks inherent in performing fixed
price contracts, may cause actual revenue and gross profits for
a project to differ from those we originally estimated and could
result in reduced profitability or losses on projects. Depending
upon the size of a particular project, variations from the
estimated contract costs can have a significant impact on our
operating results for any fiscal quarter or year.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">Our industry is highly
    competitive.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our industry is served by numerous small,
owner-operated private companies, a few public companies and
several large regional companies. In addition, relatively few
barriers prevent entry into some of our industries. As a result,
any organization that has adequate financial resources and
access to technical expertise may become one of our competitors.
Competition in the industry depends on a number of factors,
including price. Certain of our competitors may have lower
overhead cost structures and may, therefore, be able to provide
their services at lower rates than we are able to provide. In
addition, some of our competitors have greater resources than we
do. We cannot be certain that our competitors will not develop
the expertise, experience and resources to provide services that
are superior in both price and quality to our services.
Similarly, we cannot be certain that we will be able to maintain
or enhance our competitive position within our industry or
maintain a customer base at current levels. We may also face
competition from the in-house service organizations of our
existing or prospective customers. Electric power, gas,
telecommunications and cable television service providers
usually employ personnel who perform some of the same types of
services we do. We cannot be certain that our existing or
prospective customers will continue to outsource services in the
future.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">We may incur liabilities relating to
    occupational health and safety matters.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our operations are subject to extensive laws and
regulations relating to the maintenance of safe conditions in
the workplace. While we have invested, and will continue to
invest, substantial resources in our occupational health and
safety programs, our industry involves a high degree of
operational risk and there can be no assurance that we will
avoid significant liability exposure. Although we have taken
what we believe are appropriate precautions, we have suffered
fatalities in the past and may suffer additional fatalities in
the future. Claims for damages to persons, including claims for
bodily injury or loss of life, could result in substantial costs
and liabilities.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">The industries we serve are subject to
rapid technological and structural changes that could reduce the
demand for the services we provide.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The electric power, gas, telecommunications and
cable television industries are undergoing rapid change as a
result of technological advances that could, in certain cases,
reduce the demand for our services or otherwise negatively
impact our business. New or developing technologies could
displace the wireline systems used for voice, video and data
transmissions, and improvements in existing technology may allow
telecommunications and cable television companies to
significantly improve their networks without physically
upgrading them.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">Failure to obtain or maintain necessary
    performance bonds could adversely affect our
    business.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Contracts in the industries we serve often
require performance bonds or other means of financial assurance
to secure contractual performance. During 2002 and 2003, the
market for performance bonds
</FONT>

<P align="center"><FONT size="2">4
</FONT>

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<DIV align="left">
<FONT size="2">tightened significantly. If we are unable to
obtain performance bonds or letters of credit in sufficient
amounts or on acceptable terms, we might be precluded from
entering into additional contracts with certain of our
customers. Management believes that our current surety
arrangements will satisfy all of our bonding needs for the
foreseeable future, but there can be no assurance that such
surety arrangements will be sufficient to satisfy all of our
future bonding needs.
</FONT>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">Many of our contracts may be canceled on
short notice, and we may be unsuccessful in replacing our
contracts if they are cancelled or as they are completed or
expire.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We could experience a decrease in our revenue,
net income and liquidity if any of the following occur:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our customers cancel a significant number of
    contracts;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">we fail to win a significant number of our
    existing contracts upon re-bid;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">we complete a significant number of non-recurring
    projects and cannot replace them with similar projects;&nbsp;or
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">we fail to reduce operating and overhead expenses
    consistent with any decrease in our revenue.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Many of our customers may cancel our contracts on
short notice, typically 30-90&nbsp;days, even if we are not in
default under the contract. Certain of our customers assign work
to us on a project-by-project basis under master service
agreements. Under these agreements, our customers often have no
obligation to assign a specific amount of work to us. Our
operations could decline significantly if the anticipated volume
of work is not assigned to us. Many of our contracts, including
our master service contracts, are opened to public bid at the
expiration of their terms. There can be no assurance that we
will be the successful bidder on our existing contracts that
come up for bid.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">We are self-insured against potential
    liabilities.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Although we maintain insurance policies with
respect to automobile, general liability, workers&#146;
compensation and employers&#146; liability, those policies are
subject to deductibles of $1,000,000 to $2,000,000&nbsp;per
occurrence, and we are primarily self-insured for all claims
that do not exceed the amount of the applicable deductible. We
also maintain a non-union employee related health care benefit
plan that is subject to a deductible of $250,000&nbsp;per
claimant per year. Losses up to the deductible amounts are
accrued based upon our estimates of the ultimate liability for
claims incurred and an estimate of claims incurred but not
reported. However, insurance liabilities are difficult to assess
and estimate due to unknown factors, including the severity of
an injury, the determination of our liability in proportion to
other parties, the number of incidents not reported and the
effectiveness of our safety program. If we were to experience
insurance claims or costs above our estimates, our business
could be materially and adversely affected.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">The departure of key personnel could
    disrupt our business.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We depend on the continued efforts of our
executive officers and on senior management of the businesses we
acquire. Although we have entered into employment agreements
with terms of one to three years with most of our executive
officers and certain other key employees, we cannot be certain
that any individual will continue in such capacity for any
particular period of time. The loss of key personnel, or the
inability to hire and retain qualified employees, could
negatively impact our ability to manage our business. We do not
carry key-person life insurance on any of our employees.
</FONT>

<P align="center"><FONT size="2">5
</FONT>

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<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">Our unionized workforce could adversely
affect our operations and our ability to complete future
acquisitions.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">As of December&nbsp;31, 2003, approximately 43%
of our employees were covered by collective bargaining
agreements. Although the majority of these agreements prohibit
strikes and work stoppages, we cannot be certain that strikes or
work stoppages will not occur in the future. Strikes or work
stoppages would adversely impact our relationships with our
customers and could cause us to lose business and decrease our
revenue. In addition, our ability to complete future
acquisitions could be adversely affected because of our union
status for a variety of reasons. For instance, our union
agreements may be incompatible with the union agreements of a
business we want to acquire and some businesses may not want to
become affiliated with a union based company.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">Our business is labor intensive, and we may
    be unable to attract and retain qualified
    employees.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our ability to maintain our productivity and
profitability will be limited by our ability to employ, train
and retain skilled personnel necessary to meet our requirements.
We may experience shortages of qualified journeyman linemen. We
cannot be certain that we will be able to maintain an adequate
skilled labor force necessary to operate efficiently and to
support our growth strategy or that our labor expenses will not
increase as a result of a shortage in the supply of these
skilled personnel. Labor shortages or increased labor costs
could impair our ability to maintain our business or grow our
revenues.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">Our business growth could outpace the
    capability of our corporate management
    infrastructure.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We cannot be certain that our infrastructure will
be adequate to support our operations as they expand. Future
growth also could impose significant additional responsibilities
on members of our senior management, including the need to
recruit and integrate new senior level managers and executives.
We cannot be certain that we can recruit and retain such
additional managers and executives. To the extent that we are
unable to manage our growth effectively, or are unable to
attract and retain additional qualified management, we may not
be able to expand our operations or execute our business plan.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">We could have potential exposure to
    environmental liabilities.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our operations are subject to various
environmental laws and regulations, including those dealing with
the handling and disposal of waste products, PCBs, fuel storage
and air quality. As a result of past and future operations at
our facilities, we may be required to incur environmental
remediation costs and other cleanup expenses. In addition, we
cannot be certain that we will be able to identify or be
indemnified for all potential environmental liabilities relating
to any acquired business, property or assets.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">Opportunities within the government arena
could lead to increased governmental regulation applicable to
Quanta and unrecoverable start up costs.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Most government contracts are awarded through a
regulated competitive bidding process. As we pursue increased
opportunities in the government arena management&#146;s focus
associated with the start up and bidding process may be diverted
away from other opportunities. If we were to be successful in
being awarded government contracts, a significant amount of
costs could be required before any revenues were realized from
these contracts. In addition, as a government contractor we
would be subject to a number of procurement rules and other
public sector liabilities, any deemed violation of which could
lead to fines or penalties or a loss of business. Government
agencies routinely audit and investigate government contractors.
Government agencies may review a contractor&#146;s performance
under its contracts, costs structure, and compliance with
applicable laws, regulations and standards. If government
agencies determine through these audits or reviews that costs
were improperly allocated to specific contracts, they will not
reimburse the contractor for those
</FONT>

<P align="center"><FONT size="2">6
</FONT>

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<DIV align="left">
<FONT size="2">costs or may require the contractor to refund
previously reimbursed costs. Moreover, our internal controls may
not prevent improper conduct. If government agencies determine
that we engaged in improper activity, we may be subject to civil
and criminal penalties. We also could experience serious harm to
our reputation. Many government contracts must be appropriated
each year. If appropriations are not made in subsequent years we
would not realize all of the potential revenues from any awarded
contracts.
</FONT>
</DIV>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">We may not be successful in meeting the
    requirements of the Sarbanes-Oxley Act of 2002.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The Sarbanes-Oxley Act of 2002 has introduced
many new requirements applicable to Quanta regarding corporate
governance and financial reporting. Among many other
requirements is the requirement under Section&nbsp;404 of the
Act, beginning with the 2004 Annual Report, for management to
report on the Company&#146;s internal controls over financial
reporting and for Quanta&#146;s independent public accountants
to attest to this report. During 2003, the Company commenced
actions to ensure its ability to comply with these requirements,
including but not limited to, the engaging of outside experts to
assist in the evaluation of our controls, additional staffing
requirements of our internal audit department and documentation
of existing controls. In addition, the Company expects to
continue to devote substantial time and incur substantial costs
during 2004 to ensure compliance. There can be no assurance that
we will be successful in complying with Section&nbsp;404.
Failure to do so could result in the reduced ability to obtain
financing, the loss of customers, penalties and additional
expenditures to meet the requirements.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">We may not have access in the future to
    sufficient funding to finance desired growth.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">If we cannot secure additional financing in the
future on acceptable terms, we may be unable to support our
growth strategy. We cannot readily predict the ability of
certain customers to pay for past services or the timing, size
and success of our acquisition efforts. Using cash for
acquisitions limits our financial flexibility and makes us more
likely to seek additional capital through future debt or equity
financings. Our existing debt agreements contain significant
restrictions on our operational and financial flexibility,
including our ability to incur additional debt, and if we seek
more debt we may have to agree to additional covenants that
limit our operational and financial flexibility. When we seek
additional debt or equity financings, we cannot be certain that
additional debt or equity will be available to us on terms
acceptable to us or at all.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">We may be unsuccessful at generating
    internal growth.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our ability to generate internal growth will be
affected by, among other factors, our ability to:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">expand the range of services we offer to
    customers to address their evolving network needs;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">attract new customers;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">increase the number of projects performed for
    existing customers;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">hire and retain employees;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">open additional facilities.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">In addition, our customers may reduce the number
or size of projects available to us due to their inability to
obtain capital or pay for services provided. Many of the factors
affecting our ability to generate internal growth may be beyond
our control, and we cannot be certain that our strategies will
be successful or that we will be able to generate cash flow
sufficient to fund our operations and to support internal
growth. If we are unsuccessful, we may not be able to achieve
internal growth, expand our operations or grow our business.
</FONT>

<DIV>&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="6%"></TD>
    <TD width="94%"></TD>
</TR>

<TR valign="top">
    <TD></TD>
    <TD>
    <B><I><FONT size="2">Our results of operations could be
    adversely affected as a result of goodwill
    impairments.</FONT></I></B></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">When we acquire a business, we record an asset
called &#147;goodwill&#148; equal to the excess amount we pay
for the business, including liabilities assumed, over the fair
value of the tangible and intangible assets of the
</FONT>

<P align="center"><FONT size="2">7
</FONT>

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<FONT size="2">business we acquire. Through December&nbsp;31,
2001, pursuant to generally accepted accounting principles, we
amortized this goodwill over its estimated useful life of
40&nbsp;years following the acquisition, which directly impacted
our earnings. The Financial Accounting Standards Board (FASB)
issued Statement of Financial Accounting Standards (SFAS)
No.&nbsp;142 which provides that goodwill and other intangible
assets that have indefinite useful lives not be amortized, but
instead must be tested at least annually for impairment, and
intangible assets that have finite useful lives should continue
to be amortized over their useful lives. SFAS&nbsp;No.&nbsp;142
also provides specific guidance for testing goodwill and other
non-amortized intangible assets for impairment.
SFAS&nbsp;No.&nbsp;142 requires management to make certain
estimates and assumptions to allocate goodwill to reporting
units and to determine the fair value of reporting unit net
assets and liabilities, including, among other things, an
assessment of market conditions, projected cash flows,
investment rates, cost of capital and growth rates, which could
significantly impact the reported value of goodwill and other
intangible assets. Fair value is determined using a combination
of the discounted cash flow, market multiple and market
capitalization valuation approaches. Absent any impairment
indicators, we perform our impairment tests annually during the
fourth quarter. Future impairments, if any, will be recognized
as operating expenses.
</FONT>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">We may be unsuccessful at integrating
companies that we either have acquired or that we may acquire in
the future.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We cannot be sure that we can successfully
integrate our acquired companies with our existing operations
without substantial costs, delays or other operational or
financial problems. If we do not implement proper overall
business controls, our decentralized operating strategy could
result in inconsistent operating and financial practices at the
companies we acquire and our overall profitability could be
adversely affected. Integrating our acquired companies involves
a number of special risks which could have a negative impact on
our business, financial condition and results of operations,
including:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">failure of acquired companies to achieve the
    results we expect;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">diversion of our management&#146;s attention from
    operational matters;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">difficulties integrating the operations and
    personnel of acquired companies;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">inability to retain key personnel of the acquired
    companies;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">risks associated with unanticipated events or
    liabilities;&nbsp;and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">potential disruptions of our business.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">If one of our acquired companies suffers customer
dissatisfaction or performance problems, the reputation of our
entire company could suffer.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">First Reserve&#146;s investment in us may
result in potential conflicts of interest with, or dilution of,
existing stockholders.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">First Reserve Fund&nbsp;IX, L.P. (First Reserve)
owned approximately 33.8% of the outstanding shares of our
common stock as of June&nbsp;30, 2004. First Reserve demanded
the registration of the 20,000,000&nbsp;shares of common stock
registered by this prospectus. After the offering of all of the
shares of common stock represented by this prospectus, First
Reserve will own 16.5% of the outstanding shares of our common
stock. By reason of such stock ownership, conflicts of interest
may arise in the future between us and First Reserve and its
affiliates with respect to, among other things, issuances of
additional shares of voting securities or the payment of
dividends. There are no contractual or other restrictions on the
ability of First Reserve or its affiliates to pursue other
investment opportunities in any of the industries we serve. In
addition, First Reserve may have interests that could be in
conflict with those of other stockholders.
</FONT>

<P align="center"><FONT size="2">8
</FONT>

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<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">You are unlikely to be able to seek
remedies against Arthur Andersen LLP, our former independent
auditor.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Our consolidated financial statements for the
fiscal years ended prior to December&nbsp;31, 2002 were audited
by Arthur Andersen LLP, our former independent auditor. In June
2002 Arthur Andersen LLP was convicted of federal obstruction of
justice charges in connection with its destruction of documents.
As a result of its conviction, Arthur Andersen LLP has ceased
operations and is no longer in a position to reissue its audit
reports or to provide consent to include financial statements
reported on by it in this prospectus. Because Arthur Andersen
LLP has not reissued its reports and because we are not able to
obtain a consent from Arthur Andersen LLP, you will have no
effective remedy against Arthur Andersen LLP in connection with
their role as our independent public accountants for the period
covered by its previously issued reports. Even if you have a
basis for asserting a remedy against, or seeking to recover
from, Arthur Andersen LLP, we believe that it is unlikely that
you would be able to recover damages from Arthur
Andersen&nbsp;LLP.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<B><I><FONT size="2">Certain provisions of our corporate
governing documents could make an acquisition of our company
more difficult.</FONT></I></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The following provisions of our certificate of
incorporation and bylaws, as currently in effect, as well as our
stockholder rights plan and Delaware law, could discourage
potential proposals to acquire us, delay or prevent a change in
control of us or limit the price that investors may be willing
to pay in the future for shares of our common stock:
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our certificate of incorporation permits our
    board of directors to issue &#147;blank check&#148; preferred
    stock and to adopt amendments to our bylaws;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our bylaws contain restrictions regarding the
    right of stockholders to nominate directors and to submit
    proposals to be considered at stockholder meetings;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">our certificate of incorporation and bylaws
    restrict the right of stockholders to call a special meeting of
    stockholders and to act by written consent;
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">we are subject to provisions of Delaware law
    which prohibit us from engaging in any of a broad range of
    business transactions with an &#147;interested stockholder&#148;
    for a period of three&nbsp;years following the date such
    stockholder became classified as an interested stockholder; and
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">on March&nbsp;8, 2000, we adopted, and have
    subsequently amended, a stockholder rights plan that could cause
    substantial dilution to a person or group that attempts to
    acquire us on terms not approved by our board of directors or
    permitted by the stockholder rights plan.
    </FONT></TD>
</TR>

</TABLE>

<DIV align="left">
<A name='126'></A>
</DIV>

<!-- link1 "<FONT size="2">PROCEEDS FROM THE SALE OF SHARES</FONT>" -->

<P align="center">
<B><FONT size="2">PROCEEDS FROM THE SALE OF SHARES</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We will receive no proceeds from the sale of any
or all of the shares being offered by the selling stockholder
under this prospectus. We estimate we will spend approximately
$77,000 in registering the offered shares.
</FONT>

<DIV align="left">
<A name='127'></A>
</DIV>

<!-- link1 "<FONT size="2">SELLING STOCKHOLDER</FONT>" -->

<P align="center">
<B><FONT size="2">SELLING STOCKHOLDER</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We are registering all 20,000,000&nbsp;shares of
common stock covered by this prospectus on behalf of the selling
stockholder named in the table below. We issued the shares to
the selling stockholder in a private placement. We have
registered the shares to permit the selling stockholder and its
respective pledgees, donees, transferees or other
successors-in-interest that receive their shares from the
selling stockholder as a gift,
</FONT>

<P align="center"><FONT size="2">9
</FONT>

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<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV align="left">
<FONT size="2">partnership distribution or other non-sale
related transfer after the date of this prospectus to resell the
shares when they deem appropriate.
</FONT>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The table below identifies the selling
stockholder and other information regarding the beneficial
ownership of the common stock by the selling stockholder. The
second column lists the number and percentage of shares of
common stock beneficially owned by the selling stockholder as of
June&nbsp;30, 2004.
</FONT>

<CENTER>
<TABLE width="100%" align="center" cellspacing="0" cellpadding="0" border="0">

<TR>
    <TD width="36%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="3%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="5%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="1%"><FONT size="2">&nbsp;</FONT></TD>
    <TD width="4%"><FONT size="2">&nbsp;</FONT></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="7"></TD>
    <TD></TD>
    <TD colspan="3"></TD>
    <TD></TD>
    <TD colspan="7"></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><B><FONT size="1">Ownership of common</FONT></B></TD>
    <TD></TD>
    <TD colspan="3"></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><B><FONT size="1">Ownership of common</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><B><FONT size="1">stock before offering</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Number of</FONT></B></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><B><FONT size="1">stock after offering</FONT></B></TD>
</TR>

<TR>
    <TD></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">shares being</FONT></B></TD>
    <TD></TD>
    <TD colspan="7" align="center" nowrap><HR size="1" noshade></TD>
</TR>

<TR>
    <TD align="center" nowrap><B><FONT size="1">Selling stockholder</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Number</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Percentage</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">offered</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Number</FONT></B></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><B><FONT size="1">Percentage</FONT></B></TD>
</TR>

<TR>
    <TD align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
    <TD></TD>
    <TD colspan="3" align="center" nowrap><HR size="1" noshade></TD>
</TR>

<TR>
    <TD align="left" valign="top">
    <DIV style="margin-left:10px; text-indent:-10px">
    <FONT size="2">First Reserve Fund&nbsp;IX, L.P.(1)
    </FONT></DIV>
    </TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">39,038,114(2)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">33.8</FONT></TD>
    <TD align="left" valign="bottom" nowrap><FONT size="2">%(3)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">20,000,000</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">19,038,114</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
    <TD align="right" valign="bottom" nowrap><FONT size="2">16.5%(3)</FONT></TD>
    <TD><FONT size="2">&nbsp;</FONT></TD>
</TR>

</TABLE>
</CENTER>

<P align="left">
<HR size="1" width="18%" align="left" noshade>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="2%"></TD>
    <TD width="98%"></TD>
</TR>

<TR valign="top">
    <TD><FONT size="2">(1)&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">First Reserve GP IX, L.P. (GP IX) is the general
    partner of First Reserve and may be deemed to beneficially own
    all of the shares of common stock owned by First Reserve. First
    Reserve GP IX, Inc. (GP Inc.), as the general partner of GP IX,
    may be deemed to beneficially own all of the shares of common
    stock owned by First Reserve.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD><FONT size="2">(2)&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Consists of 38,916,204&nbsp;shares of common
    stock held by First Reserve, 45,187&nbsp;shares of common stock
    and options to purchase&nbsp;15,000&nbsp;shares of common stock
    issued to Ben A. Guill in his capacity as a director of Quanta
    and 61,723&nbsp;shares of common stock issued to Thomas J.
    Sikorski in his capacity as a director of Quanta. GP Inc. may be
    deemed to beneficially own the aforementioned shares and options
    issued to Ben A. Guill and Thomas J. Sikorski.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD><FONT size="2">(3)&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">The percentage above is obtained by using as the
    denominator 115,663,699&nbsp;shares of common stock, comprised
    of 115,648,699&nbsp;shares of common stock outstanding as of
    June&nbsp;30, 2004 and options to
    purchase&nbsp;15,000&nbsp;shares issued to Ben A. Guill in his
    capacity as a director of Quanta.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">
<B><FONT size="2">The First Reserve Securities Purchase
Agreement and Investor&#146;s Rights Agreement</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">On October&nbsp;15, 2002, we entered into a
Securities Purchase Agreement and an Investor&#146;s Rights
Agreement with First Reserve. Under the Securities Purchase
Agreement, on October&nbsp;15, 2002, First Reserve purchased
8,666,666&nbsp;shares of common stock from Quanta at a purchase
price of $3.00&nbsp;per share. In addition, First Reserve
agreed, subject to certain conditions, to purchase from Quanta
2,430,741&nbsp;shares of Series&nbsp;E Preferred Stock. Each
share of Series&nbsp;E Preferred Stock was convertible into ten
shares of common stock, at a price per common stock share
equivalent of not less than $3.00 nor more than $3.50, depending
on the average closing price of Quanta&#146;s common stock for a
designated period of time prior to closing. On December&nbsp;20,
2002, First Reserve purchased approximately 2.4&nbsp;million
shares of Series&nbsp;E Preferred Stock for $30.00&nbsp;per
share, and the shares of Series&nbsp;E Preferred Stock were
converted into approximately 24.3&nbsp;million shares of common
stock on December&nbsp;31, 2002.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Under the Investor&#146;s Rights Agreement, First
Reserve is entitled to (i)&nbsp;designate up to three directors
to Quanta&#146;s board of directors, depending upon First
Reserve&#146;s total ownership in Quanta and certain other
conditions, (ii)&nbsp;three demand registrations with respect to
the common stock, (iii)&nbsp;unlimited &#147;piggyback&#148;
registrations, and (iv)&nbsp;a preemptive right to purchase
shares of common stock upon Quanta&#146;s issuance of shares to
third parties. First Reserve&#146;s preemptive right allows it
to purchase a proportionate number of shares of our common stock
so that it may maintain the same voting percentage of our common
stock that it had immediately prior to the issuance of our
common stock or securities convertible into common stock to
third parties. First Reserve&#146;s purchase price for each
share of our common stock purchased pursuant to this right
equals the closing price per share of our common stock on the
date of issuance of the shares of common stock or securities
convertible into common stock to the third party. The
Investor&#146;s Rights Agreement also provides that
(i)&nbsp;First Reserve shall not transfer any portion of its
shares of our common stock to any competitor of Quanta,
(ii)&nbsp;any transferee of shares constituting 15% or more of
the voting securities of Quanta must assume in writing the
obligations of First Reserve under the Investor&#146;s Rights
Agreement, and (iii)&nbsp;any permitted transfer will be exempt
from Quanta&#146;s Stockholders&#146; Rights Plan, provided that
any transferee owning more than 5% of the voting securities of
Quanta will not, as a result of the transfer, own more than 37%
of the voting securities of Quanta. The shares offered by this
prospectus are being offered pursuant to First Reserve&#146;s
demand registration rights in the Investor&#146;s Rights
Agreement.
</FONT>

<P align="center"><FONT size="2">10
</FONT>

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<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV align="left">
<A name='128'></A>
</DIV>

<!-- link1 "<FONT size="2">HOW THE SHARES MAY BE DISTRIBUTED</FONT>" -->

<P align="center">
<B><FONT size="2">HOW THE SHARES MAY BE DISTRIBUTED</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The purpose of this prospectus is to permit the
selling stockholder or its assignees or transferees
(collectively, the &#147;selling stockholder&#148;) to offer for
sale or to sell the common shares covered by this prospectus at
such time and at such prices as the selling stockholder, in its
sole discretion, chooses. We will not receive any of the
proceeds from these offerings or sales.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The selling stockholder may sell or distribute
some or all of its shares from time to time through one or more
underwriters, dealers, brokers or other agents, by acting
directly as principal for its own account, or by any other
legally available means, to one or more purchasers in
transactions on The New&nbsp;York Stock Exchange or other
exchanges on which our common stock may be listed for trading,
in privately negotiated transactions (including sales pursuant
to pledges), in the over-the-counter market, in brokerage
transactions, through the writing of options, or in a
combination of these transactions. These transactions may
include block transactions or crosses. Crosses are transactions
in which the same broker acts as an agent on both sides of the
trade. The obligations of any underwriters or direct purchasers
to purchase the common shares covered by this prospectus may be
subject to conditions precedent specified in a prospectus
supplement. Such transactions may be effected by the selling
stockholder at market prices prevailing at the time of sale, at
varying prices determined at the time of sale, at negotiated
prices or at fixed prices, which may be changed.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Underwriters, brokers, dealers, or their agents
participating in such transactions may receive compensation in
the form of discounts, concessions, or commissions from the
selling stockholder or, if they act as agent for the purchaser
of the shares, from the purchaser. Such discounts, concessions
or commissions as to a particular broker, dealer or other agent
might be in excess of those customary in the type of transaction
involved. Any such underwriters, brokers, dealers or other
agents that participate in such distribution may be deemed to be
&#147;underwriters&#148; within the meaning of the Securities
Act. In this case, any discounts, commissions or concessions
received by any such underwriters, brokers, dealers or other
agents might be deemed to be underwriting discounts and
commissions under the Securities Act. The aggregate proceeds to
the selling stockholder from the sale of the common shares
covered by this prospectus will be the sale price of the shares,
less any discounts and commissions.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">If applicable law requires, we will
(i)&nbsp;provide a supplement to this prospectus to disclose the
specific shares to be sold, the public offering price of the
shares to be sold, the names of any underwriters, brokers,
dealers or agents employed by the selling stockholder in
connection with such sale, and any applicable discounts,
concessions or commissions with respect to a particular
transaction, and (ii)&nbsp;file a post-effective amendment to
the registration statement of which this prospectus is a part to
include any material information with respect to the plan of
distribution not previously disclosed in such registration
statement or any material change to such information in the
registration statement.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">In connection with the offer and sale of the
shares by the selling stockholder, various state securities laws
and regulations require that any such offer and sale should be
made only through the use of a broker-dealer registered as such
in any state where a selling stockholder engages such
broker-dealer and in any state where such broker-dealer intends
to offer and sell shares. In addition, in certain states the
shares may not be sold unless they have been registered or
qualified for sale in the applicable state or an exemption from
the registration or qualification requirement is available and
is complied with by us and by the selling stockholder.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Under Regulation&nbsp;M of the Exchange Act, any
person engaged in a distribution of the common shares offered
hereby may not simultaneously engage in market-making activities
with respect to our common shares for up to five business days
prior to the commencement of such distribution. In addition, the
selling stockholder will be subject to restrictions under the
Exchange Act, including Rule&nbsp;10b-5 and Regulation&nbsp;M,
which may limit the timing of purchases and sales of any of the
shares by the selling stockholder. All of the foregoing may
affect the marketability of the shares offered hereby.
</FONT>

<P align="center"><FONT size="2">11
</FONT>

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<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We will pay all expenses of the registration of
the offered securities, including SEC filing fees, expenses of
compliance with state securities or &#147;blue sky&#148; laws,
printing expenses, listing fees, fees and disbursements of our
legal counsel and independent public accountants, fees of the
National Association of Securities Dealers, Inc., transfer
taxes, fees of transfer agents and registrars, costs of
insurance and reasonable out-of-pocket expenses, including,
without limitation, all reasonable expenses incurred directly by
the selling stockholder for one legal counsel. The selling
stockholder will pay any underwriting fees, discounts and
selling commissions. The selling stockholder will be indemnified
by us against certain civil liabilities, including certain
liabilities under the Securities Act. The selling stockholder
will indemnify us against certain civil liabilities, including
certain liabilities under the Securities Act.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Under agreements which may be entered into by the
selling stockholder and/or us in connection with any sale of
common shares pursuant to this prospectus, the underwriters,
brokers, dealers or other agents that participate in the
distribution of the common shares may be entitled to
(i)&nbsp;indemnification by the selling stockholder and/or us
against some liabilities; including liabilities under the
Securities Act, or (ii)&nbsp;contribution with respect to
payments which the underwriters, brokers, dealers or agents may
be required to make relating to these liabilities. Any agreement
in which the selling stockholder and/or we agree to indemnify
underwriters, brokers, dealers and agents against civil
liabilities will be described in a prospectus supplement.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">If so indicated in a prospectus supplement, the
selling stockholder will authorize dealers or other persons
acting as an agent to solicit offers by some institutions to
purchase securities from the selling stockholder pursuant to
contracts providing for payment and delivery on a future date.
Institutions with which these contracts may be made include
commercial and savings banks, insurance companies, pension
funds, investment companies, educational and charitable
institutions, and others.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">There is at the present time no plan, arrangement
or understanding between the selling stockholder and any
underwriter, broker, dealer or agent regarding the sale of the
common shares covered by this prospectus. The selling
stockholder may decide not to sell any of the shares offered by
the selling stockholder pursuant to this prospectus. In
addition, we cannot assure you that the selling stockholder will
not transfer, devise or give the common shares covered by this
prospectus to a transferee by means not described in this
prospectus.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The selling stockholder also may resell all, or a
portion of its shares in open market transactions in reliance
upon Rule&nbsp;144 under the Securities Act, provided the
selling stockholder meets the criteria and conforms to the
requirements of such rule. Securities covered by this prospectus
may also be sold to non-U.S.&nbsp;persons outside the United
States in compliance with Regulation&nbsp;S under the Securities
Act rather than pursuant to this prospectus.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Under the First Reserve Investor&#146;s Rights
Agreement, we are obligated to keep the registration statement
of which this prospectus is a part effective until the earlier
of such time as (i)&nbsp;all of the selling stockholder&#146;s
shares offered hereby have been disposed of in accordance with
the intended methods of disposition set forth above, or
(ii)&nbsp;one year after such registration statement becomes
effective (such one-year period being subject to extension at
our discretion).
</FONT>

<DIV align="left">
<A name='129'></A>
</DIV>

<!-- link1 "<FONT size="2">LEGAL MATTERS</FONT>" -->

<P align="center">
<B><FONT size="2">LEGAL MATTERS</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">Weil, Gotshal&nbsp;&#38; Manges LLP has passed
upon the validity of the common stock offered hereby on behalf
of Quanta.
</FONT>

<DIV align="left">
<A name='130'></A>
</DIV>

<!-- link1 "<FONT size="2">EXPERTS</FONT>" -->

<P align="center">
<B><FONT size="2">EXPERTS</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The consolidated financial statements of Quanta
as of and for each of the two years in the period ended
December&nbsp;31, 2003, incorporated in this prospectus by
reference to the Annual Report on Form&nbsp;10-K for the
</FONT>

<P align="center"><FONT size="2">12
</FONT>

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<DIV align="left">
<FONT size="2">year ended December&nbsp;31, 2003, have been so
incorporated in reliance on the report of PricewaterhouseCoopers
LLP, independent accountants, given on the authority of said
firm as experts in auditing and accounting.
</FONT>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">PricewaterhouseCoopers LLP&#146;s report refers
to the adoption of the provisions of Statement of Financial
Accounting Standards No.&nbsp;142, &#147;Goodwill and Other
Intangible Assets,&#148; and to its audit of the transitional
disclosures for 2001, as more fully described in Note&nbsp;2 to
the financial statements. However, PricewaterhouseCoopers LLP
was not engaged to audit, review or apply any procedures to the
2001 consolidated financial statements other than with respect
to such disclosures.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">The consolidated financial statements of Quanta
as of and for the year ended December&nbsp;31, 2001, from our
Annual Report on Form&nbsp;10-K for the year ended
December&nbsp;31, 2003, incorporated by reference in this
prospectus, have been audited by Arthur Andersen LLP,
independent accountants, as stated in their reports appearing
therein, and are incorporated by reference herein in reliance
upon the authority of said firm as experts in auditing and
accounting.
</FONT>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We have not been able to obtain, after reasonable
efforts, the written consent of Arthur Andersen LLP to our
naming it in this prospectus or the shelf registration statement
as having certified our consolidated financial statements for
the period ended December&nbsp;31, 2001, as required by
Section&nbsp;7 of the Securities Act. We have dispensed with the
requirement to file its consent in reliance on the temporary
relief provided by the SEC under Rule&nbsp;437(a) of the
Securities Act. Accordingly, you will not be able to sue Arthur
Andersen LLP pursuant to Section&nbsp;11(a) of the Securities
Act and therefore your right of recovery under that section will
be limited as a result of the lack of consent. Even if you have
a basis for asserting a remedy against, or seeking to recover
from, Arthur Andersen LLP, we believe that it is unlikely that
you would be able to recover damages from Arthur Andersen LLP.
</FONT>

<DIV align="left">
<A name='131'></A>
</DIV>

<!-- link1 "<FONT size="2">WHERE YOU CAN FIND MORE INFORMATION</FONT>" -->

<P align="center">
<B><FONT size="2">WHERE YOU CAN FIND MORE INFORMATION</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We file annual, quarterly and special reports,
proxy statements and other information with the SEC. You can
read and copy any materials we file with the SEC at its Public
Reference Room at 450&nbsp;Fifth Street, N.W.,
Washington,&nbsp;D.C. 20549. You can obtain information about
the operation of the SEC&#146;s Public Reference Room by calling
the SEC at 1-800-SEC-0330. Copies can be obtained from the SEC
upon payment of the prescribed fees. The SEC also maintains a
web site that contains information we file electronically with
the SEC, which you can access over the Internet at
http://www.sec.gov. In addition, you can obtain information
about us at the offices of the New&nbsp;York Stock Exchange at
20&nbsp;Broad Street, New&nbsp;York, New&nbsp;York 10005.
</FONT>

<DIV align="left">
<A name='132'></A>
</DIV>

<!-- link1 "<FONT size="2">INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE</FONT>" -->

<P align="center">
<B><FONT size="2">INCORPORATION OF CERTAIN DOCUMENTS BY
REFERENCE</FONT></B>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We &#147;incorporate by reference&#148; into this
prospectus certain information we file with the SEC, which means
that we can disclose important information to you by referring
you to those documents. The information incorporated by
reference is considered to be part of this prospectus. Any
statement made in a document incorporated by reference in this
prospectus is deemed to be modified or superseded for purposes
of this prospectus to the extent that a statement in this
prospectus or in any other subsequently filed document, which is
also incorporated by reference, modifies or supersedes the
statement. Any statement made in this prospectus is deemed to be
modified or superseded to the extent a statement in any
subsequently filed document, which is incorporated by reference
in this prospectus, modifies or supersedes such statement. Any
statement so modified or superseded will not be deemed, except
as so modified or superseded, to constitute a part of this
prospectus.
</FONT>

<P align="center"><FONT size="2">13
</FONT>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We incorporate by reference the filings listed
below, which have previously been filed with the SEC, and any
future filings made with the SEC prior to the termination of
this offering under Sections&nbsp;13(a), 13(c),&nbsp;14, or
15(d) of the Exchange Act (other than current reports furnished
under Item&nbsp;9 or Item&nbsp;12 (or Item&nbsp;2.02 or
Item&nbsp;7.01) of Form&nbsp;8-K unless specifically
incorporated by reference by us). All of these filings, which
contain important information about us, are considered a part of
this prospectus.
</FONT>
<P>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96%"></TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Our annual report on Form&nbsp;10-K for the year
    ended December&nbsp;31, 2003, filed on March&nbsp;15, 2004.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">Our quarterly report on Form&nbsp;10-Q for the
    quarter ended March&nbsp;31, 2004, filed on May&nbsp;10, 2004.
    </FONT></TD>
</TR>

<TR>
    <TD>&nbsp;</TD>
</TR>

<TR valign="top">
    <TD>&nbsp;</TD>
    <TD><FONT size="2">&#149;&nbsp;</FONT></TD>
    <TD align="left">
    <FONT size="2">The description of our common stock contained in
    our registration statement on Form&nbsp;8-A/ A, filed on
    February&nbsp;6, 1998.
    </FONT></TD>
</TR>

</TABLE>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">You may obtain copies of documents incorporated
by reference in this document, without charge, by writing to us
at the following address or calling us at the telephone number
listed below:
</FONT>

<P align="center">
<FONT size="2">Quanta Services, Inc.
</FONT>

<DIV align="center">
<FONT size="2">1360 Post Oak Boulevard, Suite&nbsp;2100
</FONT>
</DIV>

<DIV align="center">
<FONT size="2">Houston, Texas 77056
</FONT>
</DIV>

<DIV align="center">
<FONT size="2">(713)&nbsp;629-7600
</FONT>
</DIV>

<DIV align="center">
<FONT size="2">Attention: Corporate Secretary
</FONT>
</DIV>

<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;
<FONT size="2">We have filed with the SEC a registration
statement on Form&nbsp;S-3 under the Securities Act covering the
shares of common stock to be offered and sold by this
prospectus. This prospectus does not contain all of the
information included in the registration statement, some of
which is contained in exhibits to the registration statement.
The registration statement, including the exhibits, can be read
at the SEC web site or at the SEC offices referred to above. Any
statement made or incorporated by reference into this prospectus
concerning the contents of any contract, agreement or other
document is only a summary of the actual contract, agreement or
other document. If we have filed any contract, agreement or
other document as an exhibit to the registration statement, you
should read the exhibit for a more complete understanding of the
document or matter involved.
</FONT>

<P align="center"><FONT size="2">14
</FONT>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<P align="center">
<IMG src="h20851b3x2085177.gif" alt="(QUANTA SERVICES, INC. LOGO)">

<DIV>&nbsp;</DIV>
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