Exhibit 10.1
FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT
     THIS FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT dated as of
August 30, 2007 (the “First Amendment”) is entered into among Quanta Services,
Inc., a Delaware corporation (the “Borrower”), the Guarantors, the Lenders party
hereto and Bank of America, N.A., as Administrative Agent, Swing Line Lender and
L/C Issuer. All capitalized terms used herein and not otherwise defined herein
shall have the meanings given to such terms in the Credit Agreement (as defined
below).
RECITALS
     WHEREAS, the Borrower, the Guarantors, the Lenders and the Administrative
Agent entered into that certain Amended and Restated Credit Agreement dated as
of June 12, 2006 (as amended and modified from time to time, the “Credit
Agreement”);
     WHEREAS, the Borrower has entered into that certain Agreement and Plan of
Merger dated as of March 18, 2007 (the “Merger Agreement”), by and among the
Borrower, Quanta MS Acquisition, Inc., a Delaware corporation and a wholly owned
subsidiary of the Borrower (“Merger Sub”), and InfraSource Services, Inc.
(“InfraSource Services”), pursuant to which Merger Sub will merge with and into
InfraSource Services (the “Merger”);
     WHEREAS, as a result of the Merger, InfraSource Services and InfraSource
Incorporated will become Subsidiaries of the Borrower at the effective time of
the Merger; and
     WHEREAS, the Borrower has requested that the Lenders amend the Credit
Agreement as set forth below;
     NOW, THEREFORE, in consideration of the premises and the mutual covenants
contained herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:
     1. Amendments.
     (a) The following new definitions are hereby added to Section 1.01 of the
Credit Agreement in the appropriate alphabetical order to read as follows:
     “First Amendment Effective Date” means August 30, 2007.
     “InfraSource” means InfraSource Incorporated, a Delaware corporation.
     “InfraSource Services” means InfraSource Services, Inc., a Delaware
corporation.
     “Regulated Subsidiary” means any Subsidiary of the Borrower (other than
InfraSource) so long as such Subsidiary is subject to regulation by a
Governmental Authority and for which the incurrence of Indebtedness (including
Guarantees) or the pledge of any Capital Stock or assets of such Subsidiary
would be prohibited or require the consent or approval of any Governmental
Authority (and such consent or approval

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has not been obtained), as set forth in any rule or regulation of such
Governmental Authority.
     (b) A “.” at the end of the definition of “Excluded Property” in Section
1.01 of the Credit Agreement is hereby replaced with the word “and”, and the
following clause (e) is hereby added after clause (d) in such definition to read
as follows:
(e) the Capital Stock of any Regulated Subsidiary prior to obtaining the receipt
of the approvals and/or consents required by Section 7.16 with respect to such
Regulated Subsidiary.
     (c) The definition of “Guarantors” in Section 1.01 of the Credit Agreement
is hereby amended to read as follows:
     “Guarantors” means each Domestic Subsidiary of the Borrower and each other
Person that joins as a Guarantor pursuant to Section 7.12, together with their
successors and permitted assigns; provided that no Regulated Subsidiary shall be
a Guarantor prior to obtaining the receipt of the approvals and/or consents
required by Section 7.16 with respect to such Regulated Subsidiary.
     (d) Section 6.03 of the Credit Agreement is hereby amended to read as
follows:
     6.03 Governmental Authorization; Other Consents.
     No approval, consent, exemption, authorization, or other action by, or
notice to, or filing with, any Governmental Authority or any other Person in
respect to any material Contractual Obligation is necessary or required in
connection with the execution, delivery or performance by, or enforcement
against, any Loan Party of this Agreement or any other Loan Document other than
(a) those that have already been obtained and are in full force and effect,
(b) filings to perfect the Liens created by the Collateral Documents and (c) the
required approval, if any, of (i) the applicable Governmental Authorities with
respect to the pledge or transfer of Capital Stock of any Regulated Subsidiary,
including pursuant to the terms and conditions of the Pledge Agreement and
(ii) the United States Federal Communications Commission with respect to the
transfer of Capital Stock of M.J. Electric, Inc., including pursuant to the
terms and conditions of the Pledge Agreement.
     (e) The following new Section 6.24 is hereby added at the end of Article VI
of the Credit Agreement to read as follows:
     6.24 Regulated Subsidiaries.
     As of the First Amendment Effective Date, no Subsidiary of the Borrower
(other than Sunesys, Inc. and Sunesys of Virginia, Inc.) is a Regulated
Subsidiary.
     (f) The language preceding clause (a) in Section 7.12 of the Credit
Agreement is hereby amended to read as follows:

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Within forty-five (45) days (x) after the acquisition or formation of any
Subsidiary (other than a Regulated Subsidiary) or (y) with respect to any
Regulated Subsidiary, after obtaining the receipt of the approvals and/or
consents required by Section 7.16:
     (g) The language preceding clause (i) in Section 7.14 of the Credit
Agreement is hereby amended to read as follows:
     Subject to the provisions of Section 7.12, each Loan Party will
     (h) The following new Section 7.16 is hereby added at the end of Article
VII of the Credit Agreement to read as follows:
     7.16 Regulated Subsidiaries.
     (a) Within a reasonable period of time following the First Amendment
Effective Date (not to exceed fifteen days), commence to diligently pursue, on a
commercially reasonable basis, all required approvals and consents from each
applicable Governmental Authority so that (i) each Regulated Subsidiary existing
as of the First Amendment Effective Date may execute and deliver to the
Administrative Agent a Joinder Agreement and such other documents required by
Section 7.12 and Section 7.14 and (ii) to the extent required by Section 7.14,
each parent of such Regulated Subsidiary may pledge the Capital Stock of such
Regulated Subsidiary to the Administrative Agent to secure the Obligations
pursuant to the Collateral Documents and (b) within a reasonable period of time
following the formation or acquisition of any Regulated Subsidiary after the
First Amendment Effective Date (not to exceed fifteen days), commence to
diligently pursue, on a commercially reasonable basis, all required approvals
and consents from each applicable Governmental Authority so that (i) such
Regulated Subsidiary may execute and deliver to the Administrative Agent a
Joinder Agreement and such other documents required by Section 7.12 and
Section 7.14 and (ii) to the extent required by Section 7.14, each parent of
such Regulated Subsidiary may pledge the Capital Stock of such Regulated
Subsidiary to the Administrative Agent to secure the Obligations pursuant to the
Collateral Documents.
     (i) Section 8.01(q) of the Credit Agreement is hereby amended to read as
follows:
     (q) (i) Liens in favor of the Surety on the Surety Priority Collateral
arising pursuant to any of the Surety Credit Documents; provided that such Liens
remain subject to the terms of the Intercreditor Agreement, (ii) Liens (provided
that those of the Surety shall be subject to the terms of the Intercreditor
Agreement) arising as a matter of law which secure the obligations of the
Borrower or any Subsidiary under any surety bond provided in the ordinary course
of business and (iii) Liens in favor of Arch Insurance Company or any subsidiary
or affiliate of Arch Insurance Company or any of their respective co-sureties or
reinsurers which secure the obligations of InfraSource Services or any of its
Subsidiaries under those certain surety bonds identified on Schedule 8.03(e);
and
     (j) Section 8.02(c) of the Credit Agreement is hereby amended to read as
follows:
     (c) Investments in any Person that is a Loan Party;

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     (k) Section 8.03(e) of the Credit Agreement is hereby amended to read as
follows:
     (e) (i) obligations of the Borrower or any Subsidiary under surety bonds
provided in the ordinary course of business, (ii) obligations of the Borrower
and its Subsidiaries under the Surety Credit Documents; provided that such
obligations are subject to the terms of the Intercreditor Agreement and (iii)
obligations of InfraSource Services or any of its Subsidiaries with respect to
the surety bonds identified on Schedule 8.03(e), it being understood and agreed
that such surety bonds identified on Schedule 8.03(e) shall not be renewed or
extended;
     (l) Schedule 1.01(a) of the Credit Agreement is hereby amended to add the
following language at the end of such Schedule:
          9. The Capital Stock in or all or substantially all of the assets of
Environmental Professional Associates, Limited.
     (m) A new Schedule 8.03(e) is hereby added to the Credit Agreement to read
as provided on Schedule 8.03(e) attached hereto.
     2. Pledge Agreement. The Lenders hereby consent to and approve the terms of
the First Amendment to Amended and Restated Pledge Agreement dated as of the
date hereof among the Loan Parties and the Administrative Agent (the “First
Amendment to Pledge Agreement”), a copy of which is attached hereto as
Exhibit A. By execution hereof, the Lenders authorize and direct the
Administrative Agent to execute the First Amendment to Pledge Agreement on
behalf of the Lenders.
     3. Conditions Precedent. This First Amendment shall be effective
immediately upon satisfaction of the following conditions precedent:
     (a) Receipt by the Administrative Agent of counterparts of this First
Amendment duly executed by each of the Borrower, the Guarantors, the Required
Lenders and Bank of America, N.A., as Administrative Agent.
     (b) Receipt by the Administrative Agent of a Pro Forma Compliance
Certificate demonstrating that, upon giving effect to the Merger on a Pro Forma
Basis, the Loan Parties are in compliance with the financial covenants set forth
in Section 8.11(b) and (c) of the Credit Agreement as of the most recent fiscal
quarter for which the Borrower has delivered financial statements pursuant to
Section 7.01(a) or (b) of the Credit Agreement.
     (c) The contemporaneous consummation of the Merger in compliance with
applicable law and regulatory approvals in accordance with the terms of the
Merger Agreement (it being agreed that promptly upon the consummation of the
Merger, the Borrower shall deliver to the Administrative Agent a copy of the
certificate of merger evidencing the consummation of the Merger).
     4. Miscellaneous.
     (a) The Credit Agreement and the obligations of the Loan Parties thereunder
and under the other Loan Documents, are hereby ratified and confirmed and shall
remain in full force and effect according to their terms.

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     (b) Upon the effectiveness of this First Amendment, each reference in the
Credit Agreement to “this Agreement,” “hereunder” or words of like import shall
mean and be a reference to the Credit Agreement, as affected and amended by this
First Amendment.
     (c) Each Guarantor (a) acknowledges and consents to all of the terms and
conditions of this First Amendment, (b) affirms all of its obligations under the
Loan Documents and (c) agrees that this First Amendment and all documents
executed in connection herewith do not operate to reduce or discharge its
obligations under the Credit Agreement or the other Loan Documents.
     (d) The Borrower and the Guarantors hereby represent and warrant as
follows:
     (i) Each Loan Party has taken all necessary action to authorize the
execution, delivery and performance of this First Amendment;
     (ii) This First Amendment has been duly executed and delivered by the Loan
Parties and constitutes each of the Loan Parties’ legal, valid and binding
obligations, enforceable in accordance with its terms, except as such
enforceability may be subject to (A) bankruptcy, insolvency, reorganization,
fraudulent conveyance or transfer, moratorium or similar laws affecting
creditors’ rights generally and (B) general principles of equity (regardless of
whether such enforceability is considered in a proceeding at law or in equity);
and
     (iii) No consent, approval, authorization or order of, or filing,
registration or qualification with, any court or governmental authority or third
party is required in connection with the execution, delivery or performance by
any Loan Party of this First Amendment.
     (e) The Loan Parties represent and warrant to the Lenders that (i) the
representations and warranties of the Loan Parties set forth in Article VI of
the Credit Agreement and in each other Loan Document are true and correct in all
material respects as of the date hereof with the same effect as if made on and
as of the date hereof, except to the extent such representations and warranties
expressly relate solely to an earlier date and (ii) no event has occurred and is
continuing which constitutes a Default or an Event of Default.
     (f) This First Amendment may be executed in any number of counterparts,
each of which when so executed and delivered shall be an original, but all of
which shall constitute one and the same instrument. Delivery of an executed
counterpart of this First Amendment by telecopy shall be effective as an
original and shall constitute a representation that an executed original shall
be delivered.
     (g) THIS FIRST AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES
HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF NEW YORK.
[Signature pages follow]

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IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to be
duly executed as of the date first above written.

     
 
   
BORROWER:
  QUANTA SERVICES, INC.,
 
  a Delaware corporation
 
   
 
  By: /s/ NICHOLAS M. GRINDSTAFF          
 
  Name: Nicholas M. Grindstaff
 
  Title: Treasurer
 
   
GUARANTORS:
  ARBY CONSTRUCTION, INC.
 
  AUSTIN TRENCHER, INC.
 
  CCLC, INC.
 
  CONTI COMMUNICATIONS, INC.
 
  CROCE ELECTRIC COMPANY, INC.
 
  DILLARD SMITH CONSTRUCTION COMPANY
 
  DRIFTWOOD ELECTRICAL CONTRACTORS, INC.
 
  GLOBAL ENERCOM MANAGEMENT, INC.
 
  GOLDEN STATE UTILITY CO.
 
  H.L. CHAPMAN PIPELINE CONSTRUCTION, INC.
 
  MANUEL BROS., INC.
 
  MEARS GROUP, INC.
 
  NETWORK ELECTRIC COMPANY
 
  NORTH SKY COMMUNICATIONS, INC.
 
  PARKSIDE SITE & UTILITY COMPANY CORPORATION
 
  PARKSIDE UTILITY CONSTRUCTION CORP.
 
  PWR FINANCIAL COMPANY
 
  QPC, INC.
 
  QSI, INC.
 
  QUANTA DELAWARE, INC.
 
  QUANTA GOVERNMENT SERVICES, INC.
 
  QUANTA GOVERNMENT SOLUTIONS, INC.
 
  QUANTA LX ACQUISITION, INC.
 
  QUANTA LXI ACQUISITION, INC.
 
  QUANTA LXII ACQUISITION, INC.
 
  QUANTA LXIII ACQUISITION, INC.
 
  QUANTA LXIV ACQUISITION, INC.
 
  QUANTA LXV ACQUISITION, INC.
 
  QUANTA LXVI ACQUISITION, INC.
 
   
 
  By: /s/ NICHOLAS M. GRINDSTAFF                    
 
  Name: Nicholas M. Grindstaff
 
  Title: Treasurer

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  QUANTA LXVII ACQUISITION, INC.
 
  QUANTA LXVIII ACQUISITION, INC.
 
  QUANTA LXIX ACQUISITION, INC.
 
  QUANTA LXX ACQUISITION, INC.
 
  QUANTA LXXI ACQUISITION, INC.
 
  QUANTA LXXII ACQUISITION, INC.
 
  QUANTA LXXIII ACQUISITION, INC.
 
  QUANTA MS ACQUISITION, INC.
 
  QUANTA SERVICES CONTRACTING, INC.
 
  QUANTA UNDERGROUND SERVICES, INC.
 
  QUANTA UTILITY INSTALLATION
 
  COMPANY, INC.
 
  QUANTA UTILITY SERVICES-GULF STATES, INC.
 
  QUANTA WIRELESS SOLUTIONS, INC.
 
  R.A. WAFFENSMITH & CO., INC.
 
  SPALJ CONSTRUCTION COMPANY
 
  SUMTER UTILITIES, INC.
 
  TOM ALLEN CONSTRUCTION COMPANY
 
  TTGP, INC.
 
  TTLP, INC.
 
  UNDERGROUND CONSTRUCTION CO., INC.
 
  UTILITY LINE MANAGEMENT SERVICES, INC.
 
  VCI TELCOM, INC.
 
  W.C. COMMUNICATIONS, INC.,
 
  ADVANCED TECHNOLOGIES AND INSTALLATION CORPORATION
 
  ALLTECK LINE CONTRACTORS (USA), INC.
 
  POTELCO, INC.
 
  BRADFORD BROTHERS, INCORPORATED
 
  TTM, INC.
 
  CMI SERVICES, INC.
 
  TRAWICK CONSTRUCTION COMPANY, INC.
 
  FIBER TECHNOLOGIES, INC.
 
  ENVIRONMENTAL PROFESSIONAL ASSOCIATES, LIMITED
 
  FIVE POINTS CONSTRUCTION CO.
 
  MEJIA PERSONNEL SERVICES, INC.
 
  SOUTHWEST TRENCHING COMPANY, INC.
 
  INTERMOUNTAIN ELECTRIC, INC.
 
  IRBY CONSTRUCTION COMPANY
 
  METRO UNDERGROUND SERVICES, INC. OF ILLINOIS
 
  PROFESSIONAL TELECONCEPTS, INC.
 
   
 
  By: /s/ NICHOLAS M. GRINDSTAFF                    
 
  Name: Nicholas M. Grindstaff
 
  Title: Treasurer

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            PAR ELECTRICAL CONTRACTORS, INC.     PROFESSIONAL TELECONCEPTS, INC.
    THE RYAN COMPANY, INC.
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            QDE LLC
 
       
 
  By:   PWR Financial Company,
its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            QUANTA ASSET MANAGEMENT LLC
 
       
 
  By:   QSI, Inc., its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            TOTAL QUALITY MANAGEMENT SERVICES, LLC
 
       
 
  By:   Environmental Professional Associates,
 
      Limited, its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer

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            QUANTA UTILITY SERVICES, LLC
 
       
 
  By:   Mejia Personnel Services, Inc.,
 
      its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            TJADER, L.L.C.     OKAY CONSTRUCTION COMPANY, LLC
 
       
 
  By:   Spalj Construction Company,
 
      its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            MEARS/CPG LLC     MEARS ENGINEERING/ LLC     MEARS/HDD, LLC    
MEARS SERVICES LLC
 
       
 
  By:   Mears Group, Inc.,
 
      the sole member of each of the foregoing
 
      limited liability companies
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            S.K.S. PIPELINERS, LLC
 
       
 
  By:   Arby Construction, Inc.,
 
      its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer

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            TNS-VA, LLC
 
       
 
  By:   Professional Teleconcepts, Inc.,
its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            NORTH HOUSTON POLE LINE, L.P.     LINDSEY ELECTRIC, L.P.     DIGCO
UTILITY CONSTRUCTION, L.P.
 
       
 
  By:   Mejia Personnel Services, Inc.,
 
      its general partner
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            QUANTA SERVICES MANAGEMENT PARTNERSHIP, L.P.     QUANTA ASSOCIATES,
L.P.
 
       
 
  By:   QSI, Inc.,
 
      its general partner
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            TRANS TECH ELECTRIC, L.P.
 
       
 
  By:   TTGP, Inc.,
 
      its general partner
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer

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            PWR NETWORK, LLC
 
       
 
  By:   PWR Financial Company,
its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            QUANTA RECEIVABLES, LP
 
       
 
  By:   PWR Network, LLC,
 
      its general partner
 
       
 
  By:   PWR Financial Company,
 
      its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            SPECTRUM CONSTRUCTION CONTRACTING, L.L.C.
 
       
 
  By:   Conti Communications, Inc.,
 
      its sole member
 
       
 
  By:   /s/ NICHOLAS M. GRINDSTAFF
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer

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ADMINISTRATIVE
            AGENT:   BANK OF AMERICA, N.A.,         as Administrative Agent    
 
           
 
  By:   /s/ KRISTINE THENNES    
 
           
 
  Name:   Kristine Thennes    
 
  Title:   Vice President    

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            LENDERS:   BANK OF AMERICA, N.A.,    
 
           
 
  By:   /s/ GARY L. MINGLE    
 
           
 
  Name:   Gary L. Mingle    
 
  Title:   Senior Vice-President    

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            LENDERS:   WACHOVIA BANK, NATIONAL ASSOCIATION    
 
           
 
  By:   /s/ MICHAEL R. QUIRAY    
 
           
 
  Name:   Michael R. Quiray    
 
  Title:   Vice President    

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            LENDERS:   WELLS FARGO BANK, N.A.    
 
           
 
  By:   /s/ H. MICHAEL SULTANIK    
 
           
 
  Name:   H. Michael Sultanik    
 
  Title:   Vice President    

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            LENDERS:   CREDIT SUISSE, CAYMAN ISLANDS BRANCH    
 
           
 
  By:   /s/ VANESSA GOMEZ    
 
           
 
  Name:   Vanessa Gomez    
 
  Title:   Vice President    
 
           
 
  By:   /s/ NUPUR KUMAR    
 
           
 
  Name:   Nupur Kumar    
 
  Title:   Associate    

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            LENDERS:   COMPASS BANK    
 
           
 
  By:   /s/ TOM BROSIG    
 
           
 
  Name:   Tom Brosig    
 
  Title:   Senior Vice President    

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            LENDERS:   MB FINANCIAL BANK, N.A. (F/N/A OAK BROOK BANK)    
 
           
 
  By:   /s/ HENRY WESSEL    
 
           
 
  Name:   Henry Wessel    
 
  Title:   Vice President    

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            LENDERS:   FIRSTRUST BANK    
 
           
 
  By:   /s/ ELLEN FRANK    
 
           
 
  Name:   Ellen Frank    
 
  Title:   Vice President    

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            LENDERS:   THE PRUDENTIAL INSURANCE         COMPANY OF AMERICA    
 
           
 
  By:   /s/ BRIAN N. THOMAS    
 
           
 
  Name:   Brian N. Thomas    
 
  Title:   Vice President    

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            LENDERS:   WEBSTER BANK, NATIONAL ASSOCIATION    
 
           
 
  By:   /s/ JOHN GILSENAN    
 
           
 
  Name:   John Gilsenan    
 
  Title:   Vice President    

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            LENDERS:   NORTH FORK BUSINESS CAPITAL CORPORATION    
 
           
 
  By:   /s/ RON WALKER    
 
           
 
  Name:   Ron Walker    
 
  Title:   Vice President    

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            LENDERS:   [CALYON NEW YORK BRANCH]    
 
           
 
  By:   /s/ ROBERT NELSON    
 
           
 
  Name:   Robert Nelson    
 
  Title:   Managing Director    
 
           
 
  By:   /s/ BRIAN MYERS    
 
           
 
  Name:   Brian Myers    
 
  Title:   Managing Director    

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            LENDERS:   MIDFIRST BANK    
 
           
 
  By:   /s/ SHAWN D. BREWER    
 
           
 
  Name:   Shawn D. Brewer    
 
  Title:   Vice President    

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Exhibit A
FIRST AMENDMENT TO AMENDED AND RESTATED PLEDGE AGREEMENT
     THIS FIRST AMENDMENT TO AMENDED AND RESTATED PLEDGE AGREEMENT dated as of  
                    (the “First Amendment”) is entered into by and among the
parties identified as “Pledgors” on the signature pages attached hereto and Bank
of America, N.A., as Administrative Agent (in such capacity, the “Administrative
Agent”), for the ratable benefit of the holders of the Secured Obligations (as
defined in the Pledge Agreement (as defined below)), and amends the Pledge
Agreement (as defined below). All capitalized terms used herein and not
otherwise defined herein shall have the meanings given to such terms in the
Credit Agreement (as defined below).
RECITALS
     WHEREAS, Quanta Services, Inc., a Delaware corporation (the “Borrower”),
the Guarantors, the Lenders and the Administrative Agent have entered into that
certain Amended and Restated Credit Agreement dated as of June 12, 2006 (as
amended by the First Amendment to Amended and Restated Credit Agreement dated as
of even date herewith (the “First Amendment to Credit Agreement”), and as
further amended and modified from time to time, the “Credit Agreement”);
     WHEREAS, the Pledgors and the Administrative Agent have entered into that
certain Amended and Restated Pledge Agreement dated as of June 12, 2006 (as
amended and modified from time to time, the “Pledge Agreement”);
     WHEREAS, the Borrower has entered into that certain Agreement and Plan of
Merger, dated as of March 18, 2007, by and among the Borrower, Quanta MS
Acquisition, Inc., a Delaware corporation and a wholly owned subsidiary of the
Borrower (“Merger Sub”), and InfraSource Services, Inc. (“InfraSource
Services”), pursuant to which Merger Sub will merge with and into InfraSource
Services (the “Merger”);
     WHEREAS, as a result of the Merger, InfraSource Services and InfraSource
Incorporated will become Subsidiaries of the Borrower at the effective time of
the Merger; and
     WHEREAS, the Borrower has requested that the Lenders amend the Pledge
Agreement as set forth below;
     NOW, THEREFORE, in consideration of the premises and the mutual covenants
contained herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:
     1. Amendments.
     (a) The introductory paragraph of Section 2.1 of the Pledge Agreement is
hereby amended and restated to read in its entirety as follows:
     2.1 Security Interest and Pledge. Subject to the terms of this Agreement
and the Credit Agreement, and to secure the Secured Obligations, each Pledgor
hereby pledges, assigns, grants, conveys and transfers to the Administrative
Agent for the ratable benefit of the holders of the Secured Obligations a
continuing first priority security interest in, and a right of set-off against,
any and all of such Pledgor’s rights,

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title and interest in, to and under the following property, whether now existing
or owned, acquired or arising hereafter (collectively, the “Collateral”):
     (b) Section 2.1(a) of the Pledge Agreement is hereby amended and restated
to read in its entirety as follows:

  (a)   all of the shares of Capital Stock in the Persons listed on the attached
Schedule 2.1(a) and any other entities which hereafter become Subsidiaries of
such Pledgor or any of its Subsidiaries in which such Pledgor has an ownership
interest (other than a Regulated Subsidiary, until such time as all approvals
and/or consents required by Section 7.16 of the Credit Agreement with respect to
such Regulated Subsidiary shall have been obtained) (collectively, the
“Companies”), and the certificates or instruments, if any, representing such
Capital Stock and all options and other rights, contractual or otherwise, with
respect thereto (collectively, the “Pledged Shares”);

     (c) Section 3.5 of the Pledge Agreement is hereby amended and restated to
read in its entirety as follows:
     3.5 No Consent. No consent of, or notice to, any other Person and no
authorization, approval or other action by, and no notice to or filing with, any
governmental authority or regulatory body is required for the grant by such
Pledgor of the Liens granted hereby or for the execution, delivery or
performance of this Agreement by such Pledgor, other than (a) the filing of
financing statements and the filing of an investment act notice in connection
with the stock of any Subsidiary organized in Canada, (b) with respect to the
securities of M.J. Electric, Inc., the approval of the Federal Communications
Commission would be required if the securities are transferred through
foreclosure or otherwise, and (c) (i) if the New Jersey Board of Public
Utilities (“NJBPU”) asserts jurisdiction, the pledge of the stock of Sunesys,
Inc. may require the approval of the NJBPU and (ii) with respect to the
securities of Sunesys, Inc., certain state public utility commission approvals
may be required if the securities are transferred through foreclosure or
otherwise, and except for such other consents, notices or filings that have been
obtained or made or that as of the date hereof are not required to have been
obtained or made and may be obtained or made, as the case may be, when
necessary.
     2. Conditions Precedent. This First Amendment shall be effective
immediately upon satisfaction of the following conditions precedent:
     (a) receipt by the Administrative Agent of counterparts of this First
Amendment duly executed by each of the Pledgors and the Administrative Agent;
and
     (b) the First Amendment to Credit Agreement shall have become effective.
     3. Miscellaneous.
     (a) The Pledge Agreement and the obligations of the Pledgors thereunder and
under the other Loan Documents, are hereby ratified and confirmed and shall
remain in full force and effect according to their terms.

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     (b) Upon the effectiveness of this First Amendment, each reference in the
Pledge Agreement to “this Agreement,” “hereunder” or words of like import shall
mean and be a reference to the Pledge Agreement, as affected and amended by this
First Amendment.
     (c) Each Pledgor (a) acknowledges and consents to all of the terms and
conditions of this First Amendment, (b) affirms all of its obligations under the
Loan Documents and (c) agrees that this First Amendment and all documents
executed in connection herewith do not operate to reduce or discharge its
obligations under the Pledge Agreement or the other Loan Documents.
     (d) The Pledgors hereby represent and warrant as follows:
     (i) Each Pledgor has taken all necessary action to authorize the execution,
delivery and performance of this First Amendment;
     (ii) This First Amendment has been duly executed and delivered by the
Pledgors and constitutes each of the Pledgors’ legal, valid and binding
obligations, enforceable in accordance with its terms, except as such
enforceability may be subject to (A) bankruptcy, insolvency, reorganization,
fraudulent conveyance or transfer, moratorium or similar laws affecting
creditors’ rights generally and (B) general principles of equity (regardless of
whether such enforceability is considered in a proceeding at law or in equity);
and
     (iii) No consent, approval, authorization or order of, or filing,
registration or qualification with, any court or governmental authority or third
party is required in connection with the execution, delivery or performance by
any Pledgor of this First Amendment.
     (e) The Pledgors represent and warrant to the Lenders that (i) the
representations and warranties of the Pledgors set forth in Section 3 of the
Pledge Agreement and in each other Loan Document are true and correct in all
material respects as of the date hereof with the same effect as if made on and
as of the date hereof, except to the extent such representations and warranties
expressly relate solely to an earlier date and (ii) no event has occurred and is
continuing which constitutes a Default or an Event of Default.
     (f) This First Amendment may be executed in any number of counterparts,
each of which when so executed and delivered shall be an original, but all of
which shall constitute one and the same instrument. Delivery of an executed
counterpart of this First Amendment by telecopy shall be effective as an
original and shall constitute a representation that an executed original shall
be delivered.
     (g) THIS FIRST AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES
HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF NEW YORK.
[Signature pages follow]

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     IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to
be duly executed as of the date first above written.

     
 
   
PLEDGORS:
  QUANTA SERVICES, INC.,
 
  a Delaware corporation
 
   
 
  By:                                                             
 
  Name: Nicholas M. Grindstaff
 
  Title: Treasurer
 
   
 
  ARBY CONSTRUCTION, INC.
 
  AUSTIN TRENCHER, INC.
 
  CCLC, INC.
 
  CONTI COMMUNICATIONS, INC.
 
  CROCE ELECTRIC COMPANY, INC.
 
  DILLARD SMITH CONSTRUCTION COMPANY
 
  DRIFTWOOD ELECTRICAL CONTRACTORS, INC.
 
  GLOBAL ENERCOM MANAGEMENT, INC.
 
  GOLDEN STATE UTILITY CO.
 
  H.L. CHAPMAN PIPELINE CONSTRUCTION, INC.
 
  MANUEL BROS., INC.
 
  MEARS GROUP, INC.
 
  NETWORK ELECTRIC COMPANY
 
  NORTH SKY COMMUNICATIONS, INC.
 
  PARKSIDE SITE & UTILITY COMPANY CORPORATION
 
  PARKSIDE UTILITY CONSTRUCTION CORP.
 
  PWR FINANCIAL COMPANY
 
  QPC, INC.
 
  QSI, INC.
 
  QUANTA DELAWARE, INC.
 
  QUANTA GOVERNMENT SERVICES, INC.
 
  QUANTA GOVERNMENT SOLUTIONS, INC.
 
  QUANTA LX ACQUISITION, INC.
 
  QUANTA LXI ACQUISITION, INC.
 
  QUANTA LXII ACQUISITION, INC.
 
  QUANTA LXIII ACQUISITION, INC.
 
  QUANTA LXIV ACQUISITION, INC.
 
  QUANTA LXV ACQUISITION, INC.
 
  QUANTA LXVI ACQUISITION, INC.
 
   
 
  By:                                                             
 
  Name: Nicholas M. Grindstaff
 
  Title: Treasurer

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  QUANTA LXVII ACQUISITION, INC.
 
  QUANTA LXVIII ACQUISITION, INC.
 
  QUANTA LXIX ACQUISITION, INC.
 
  QUANTA LXX ACQUISITION, INC.
 
  QUANTA LXXI ACQUISITION, INC.
 
  QUANTA LXXII ACQUISITION, INC.
 
  QUANTA LXXIII ACQUISITION, INC.
 
  QUANTA MS ACQUISITION, INC.
 
  QUANTA SERVICES CONTRACTING, INC.
 
  QUANTA UNDERGROUND SERVICES, INC.
 
  QUANTA UTILITY INSTALLATION COMPANY, INC.
 
  QUANTA UTILITY SERVICES-GULF STATES, INC.
 
  QUANTA WIRELESS SOLUTIONS, INC.
 
  R.A. WAFFENSMITH & CO., INC.
 
  SPALJ CONSTRUCTION COMPANY
 
  SUMTER UTILITIES, INC.
 
  TOM ALLEN CONSTRUCTION COMPANY
 
  TTGP, INC.
 
  TTLP, INC.
 
  UNDERGROUND CONSTRUCTION CO., INC.
 
  UTILITY LINE MANAGEMENT SERVICES, INC.
 
  VCI TELCOM, INC.
 
  W.C. COMMUNICATIONS, INC.,
 
  ADVANCED TECHNOLOGIES AND INSTALLATION CORPORATION
````
  ALLTECK LINE CONTRACTORS (USA), INC.
 
  POTELCO, INC.
 
  BRADFORD BROTHERS, INCORPORATED
 
  TTM, INC.
 
  CMI SERVICES, INC.
 
  TRAWICK CONSTRUCTION COMPANY, INC.
 
  FIBER TECHNOLOGIES, INC.
 
  ENVIRONMENTAL PROFESSIONAL ASSOCIATES, LIMITED
 
  FIVE POINTS CONSTRUCTION CO.
 
  MEJIA PERSONNEL SERVICES, INC.
 
  SOUTHWEST TRENCHING COMPANY, INC.
 
  INTERMOUNTAIN ELECTRIC, INC.
 
  IRBY CONSTRUCTION COMPANY
 
  METRO UNDERGROUND SERVICES, INC. OF ILLINOIS
 
  PROFESSIONAL TELECONCEPTS, INC.
 
   
 
  By:                                                             
 
  Name: Nicholas M. Grindstaff
 
  Title: Treasurer

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            PAR ELECTRICAL CONTRACTORS, INC.     PROFESSIONAL TELECONCEPTS, INC.
    THE RYAN COMPANY, INC.
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            QDE LLC
 
       
 
  By:   PWR Financial Company,
its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            QUANTA ASSET MANAGEMENT LLC
 
       
 
  By:   QSI, Inc.,
 
      its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            TOTAL QUALITY MANAGEMENT SERVICES, LLC
 
       
 
  By:   Environmental Professional Associates,
 
      Limited, its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer

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            QUANTA UTILITY SERVICES, LLC
 
       
 
  By:   Mejia Personnel Services, Inc.,
 
      its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            TJADER, L.L.C.     OKAY CONSTRUCTION COMPANY, LLC
 
       
 
  By:   Spalj Construction Company,
its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            MEARS/CPG LLC     MEARS ENGINEERING/ LLC     MEARS/HDD, LLC    
MEARS SERVICES LLC
 
       
 
  By:   Mears Group, Inc.,
 
      the sole member of each of the foregoing
 
      limited liability companies
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            S.K.S. PIPELINERS, LLC
 
       
 
  By:   Arby Construction, Inc.,
 
      its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer

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            TNS-VA, LLC
 
       
 
  By:   Professional Teleconcepts, Inc., its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            NORTH HOUSTON POLE LINE, L.P.     LINDSEY ELECTRIC, L.P.     DIGCO
UTILITY CONSTRUCTION, L.P.
 
       
 
  By:   Mejia Personnel Services, Inc.,
 
      its general partner
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            QUANTA SERVICES MANAGEMENT PARTNERSHIP, L.P.     QUANTA ASSOCIATES,
L.P.
 
       
 
  By:   QSI, Inc.,
 
      its general partner
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            TRANS TECH ELECTRIC, L.P.
 
       
````````````
  By:   TTGP, Inc.,
 
      its general partner
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer

32

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            PWR NETWORK, LLC
 
       
 
  By:   PWR Financial Company,
 
      its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            QUANTA RECEIVABLES, LP
 
       
 
  By:   PWR Network, LLC,
 
      its general partner
 
       
 
  By:   PWR Financial Company,
 
      its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer
 
            SPECTRUM CONSTRUCTION CONTRACTING, L.L.C.
 
       
 
  By:   Conti Communications, Inc.,
 
      its sole member
 
       
 
  By:    
 
       
 
  Name:   Nicholas M. Grindstaff
 
  Title:   Treasurer

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ADMINISTRATIVE
            AGENT:   BANK OF AMERICA, N.A.,         as Administrative Agent    
 
  By:        
 
           
 
  Name:   Charlene Wright-Jones    
 
  Title:   Assistant Vice President    

34