Document:

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                                                                   EXHIBIT 10.30

                              EMPLOYMENT AGREEMENT

         This Employment Agreement (the "Agreement"), by and between Quanta
Services, Inc., a Delaware corporation, and its affiliates (collectively,
"Employer"), and James F. O'Neil III ("Employee"), is hereby entered into as of
the 13th day of March 2002 ("Execution Date").

                                    RECITALS

         A. As of the Execution Date, Employer is engaged primarily in the
business of specialized construction contracting and/or maintenance services to:
electric utilities; telecommunication, cable television and natural gas
operators; governmental entities; the transportation industry; and commercial
and industrial customers.

         B. Employee is employed hereunder by Employer in a position that is
critical to the Employer's continued operation.

         C. The Employer's Board of Directors (the "Board"), has determined that
it is in the best interests of the Employer and its stockholders to assure that
the Employer will have the continued dedication of the Employee, notwithstanding
the possibility, threat or occurrence of a Change of Control (as defined below)
of the Employer. The Board believes it is imperative to diminish the inevitable
distraction of the Employee by virtue of the personal uncertainties and risks
created by a pending or threatened Change of Control and to encourage the
Employee's full attention and dedication to the Employer currently and in the
event of any threatened or pending Change of Control, and to provide the
Employee with compensation and benefits arrangements upon a Change of Control
that ensure that the compensation and benefits expectations of the Employee will
be satisfied and that are competitive with those of other corporations.
Therefore, in order to accomplish these objectives, the Board has caused the
Employer to enter into this Agreement.

                                   AGREEMENTS

         In consideration of the mutual promises, terms, covenants and
conditions set forth herein and the performance of each, the parties hereto
hereby agree as follows:

         1. Certain Definitions.

                  (a) The "Effective Date" shall mean the first date during the
         Change of Control Period (as defined in Section 1(b)) on which a Change
         of Control (as defined in Section 2) occurs. Anything in this Agreement
         to the contrary notwithstanding, if a Change of Control occurs and if
         the Employee's employment with the Employer is terminated prior to the
         date on which the Change of Control occurs, and if the Employee
         reasonably demonstrates that such termination of employment (i) was at
         the request of a third party who has taken steps reasonably calculated
         to effect a Change of Control or (ii) otherwise arose in connection
         with or anticipation of a Change of Control, then for all purposes of
         this Agreement the "Effective Date" shall mean the date immediately
         prior to the date of such termination of employment.

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                  (b) The "Change of Control Period" shall mean the period
         commencing on the Execution Date hereof and ending on the third
         anniversary of the Execution Date; provided, however, that commencing
         on the date one year after the date hereof, and on each annual
         anniversary of such date (such date and each annual anniversary thereof
         shall be hereinafter referred to as the "Renewal Date"), unless
         previously terminated, the Change of Control Period shall be
         automatically extended so as to terminate three years from such Renewal
         Date, unless at least 60 days prior to the Renewal Date the Employer
         shall give notice to the Employee that the Change of Control Period
         shall not be so extended.

                  (c) The "Code" shall mean the Internal Revenue Code of 1986,
         as amended.

                  (d) The "Earlier Employment Agreement" shall mean any
         employment, severance or change in control agreement between the
         Employer and the Employee that existed and was effective as of the
         Execution Date. The Employee may elect in writing, on or before the
         Employee's Date of Termination, to have any term, provision and/or
         definition under the Employees' Earlier Employment Agreement apply in
         lieu of any similar term, provision and/or definition of this
         Agreement, except to the extent that such application would produce
         duplicate payments or benefits under this Agreement and such Earlier
         Employment Agreement.

         2. Change of Control. For the purpose of this Agreement, a "Change of
Control" shall mean:

                  (a) Any person or entity, other than the Employer or an
         employee benefit plan of the Employer, acquires directly or indirectly
         the Beneficial Ownership (as defined in Section 13(d) of the Exchange
         Act) of any voting security of the Employer and immediately after such
         acquisition such person or entity is, directly or indirectly, the
         Beneficial Owner of voting securities representing 50% or more of the
         total voting power of all of the then-outstanding voting securities of
         the Employer; or

                  (b) Individuals who, as of the date hereof, constitute the
         Board, and any new director whose election by the Board or nomination
         for election by the Employer's stockholders was approved by a vote of a
         majority of the directors then still in office who were directors as of
         the date hereof or whose election or nomination for election was
         previously so approved, cease for any reason to constitute at least a
         majority of the members of the Board; or

                  (c) The stockholders of the Employer shall approve a merger,
         consolidation, recapitalization or reorganization of the Employer, a
         reverse stock split of outstanding voting securities, or consummation
         of any such transaction if stockholder approval is not obtained, other
         than any such transaction that would result in at least 50% of the
         total voting power represented by the voting securities of the
         surviving entity outstanding immediately after such transaction being
         Beneficially Owned by at least 50% of the holders of outstanding voting
         securities of the Employer immediately prior to the transaction, with
         the voting power of each such continuing holder relative to other such
         continuing holders not substantially altered in the transaction; or

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                  (d) The stockholders of the Employer shall approve a plan of
         complete liquidation of the Employer or an agreement for the sale or
         disposition by the Employer of all or a substantial portion of the
         Employer's assets (i.e., 50% or more of the total assets of the
         Employer).

         3. Employment Period. The Employer hereby agrees to continue the
Employee in its employ, and the Employee hereby agrees to remain in the employ
of the Employer subject to the terms and conditions of this Agreement, for the
period commencing on the Effective Date and ending on the third anniversary of
such date (the "Employment Period").

         4. Terms of Employment.

                  (a) Position and Duties.

                           (i) During the Employment Period, (A) the Employee's
                  position (including status, offices, titles and reporting
                  requirements), authority, duties and responsibilities shall be
                  at least commensurate in all material respects with the most
                  significant of those held, exercised and assigned at any time
                  during the 120-day period immediately preceding the Effective
                  Date and (B) the Employee's services shall be performed at the
                  location where the Employee was employed immediately preceding
                  the Effective Date or any office or location less than 35
                  miles from such location.

                           (ii) During the Employment Period, and excluding any
                  periods of vacation and sick leave to which the Employee is
                  entitled, the Employee agrees to devote reasonable attention
                  and time during normal business hours to the business and
                  affairs of the Employer and, to the extent necessary to
                  discharge the responsibilities assigned to the Employee
                  hereunder, to use the Employee's reasonable best efforts to
                  perform faithfully and efficiently such responsibilities.
                  During the Employment Period it shall not be a violation of
                  this Agreement for the Employee to (A) serve on corporate,
                  civic or charitable boards or committees, (B) deliver
                  lectures, fulfill speaking engagements or teach at educational
                  institutions and (C) manage personal investments, so long as
                  such activities do not significantly interfere with the
                  performance of the Employee's responsibilities as an employee
                  of the Employer in accordance with this Agreement. It is
                  expressly understood and agreed that to the extent that any
                  such activities have been conducted by the Employee prior to
                  the Effective Date, the continued conduct of such activities
                  (or the conduct of activities similar in nature and scope
                  thereto) subsequent to the Effective Date shall not thereafter
                  be deemed to interfere with the performance of the Employee's
                  responsibilities to the Employer.

                  (b) Compensation.

                           (i) Base Salary. During the Employment Period, the
                  Employee shall receive an annual base salary ("Annual Base
                  Salary"), which shall be paid at a monthly rate, at least
                  equal to 12 times the highest monthly base salary paid or
                  payable, including any base salary that has been earned but
                  deferred, to the

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                  Employee by the Employer and its affiliated companies in
                  respect of the 12-month period immediately preceding the month
                  in which the Effective Date occurs. During the Employment
                  Period, the Annual Base Salary shall be reviewed no more than
                  12 months after the last salary increase awarded to the
                  Employee prior to the Effective Date and thereafter at least
                  annually. Any increase in Annual Base Salary shall not serve
                  to limit or reduce any other obligation to the Employee under
                  this Agreement. Annual Base Salary shall not be reduced after
                  any such increase and the term Annual Base Salary as utilized
                  in this Agreement shall refer to Annual Base Salary as so
                  increased. As used in this Agreement, the term "affiliated
                  companies" shall include any company controlled by,
                  controlling or under common control with the Employer.

                           (ii) Annual Bonus. In addition to Annual Base Salary,
                  the Employee shall be awarded, for each fiscal year ending
                  during the Employment Period, an annual bonus (the "Annual
                  Bonus") in cash at least equal to the Employee's highest bonus
                  under the Employer's Management Incentive Bonus Plan, or any
                  comparable bonus under any predecessor or successor plan, for
                  the last three full fiscal years prior to the Effective Date
                  (annualized in the event that the Employee was not employed by
                  the Employer for the whole of such fiscal year) (the "Recent
                  Annual Bonus"). Each such Annual Bonus shall be paid no later
                  than the end of the third month of the fiscal year next
                  following the fiscal year for which the Annual Bonus is
                  awarded, unless the Employee shall elect to defer the receipt
                  of such Annual Bonus.

                           (iii) Incentive, Savings and Retirement Plans. During
                  the Employment Period, the Employee shall be entitled to
                  participate in all incentive, savings and retirement plans,
                  practices, policies and programs applicable generally to other
                  peer executives of the Employer and its affiliated companies,
                  but in no event shall such plans, practices, policies and
                  programs provide the Employee with incentive opportunities
                  (measured with respect to both regular and special incentive
                  opportunities, to the extent, if any, that such distinction is
                  applicable), savings opportunities and retirement benefit
                  opportunities, in each case, less favorable, in the aggregate,
                  than the most favorable of those provided by the Employer and
                  its affiliated companies for the Employee under such plans,
                  practices, policies and programs as in effect at any time
                  during the 120-day period immediately preceding the Effective
                  Date or if more favorable to the Employee, those provided
                  generally at any time after the Effective Date to other peer
                  executives of the Employer and its affiliated companies.

                           (iv) Welfare Benefit Plans. During the Employment
                  Period, the Employee and/or the Employee's family, as the case
                  may be, shall be eligible for participation in and shall
                  receive all benefits under welfare benefit plans, practices,
                  policies and programs provided by the Employer and its
                  affiliated companies (including, without limitation, medical,
                  prescription, dental, disability, employee life, group life,
                  accidental death and travel accident insurance plans and
                  programs) to the extent applicable generally to other peer
                  executives of the Employer and its affiliated companies, but
                  in no event shall such plans, practices,

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                  policies and programs provide the Employee with benefits that
                  are less favorable, in the aggregate, than the most favorable
                  of such plans, practices, policies and programs in effect for
                  the Employee at any time during the 120-day period immediately
                  preceding the Effective Date or, if more favorable to the
                  Employee, those provided generally at any time after the
                  Effective Date to other peer executives of the Employer and
                  its affiliated companies.

                           (v) Expenses. During the Employment Period, the
                  Employee shall be entitled to receive prompt reimbursement for
                  all reasonable expenses incurred by the Employee in accordance
                  with the most favorable policies, practices and procedures of
                  the Employer and its affiliated companies in effect for the
                  Employee at any time during the 120-day period immediately
                  preceding the Effective Date or, if more favorable to the
                  Employee, as in effect generally at any time thereafter with
                  respect to other peer executives of the Employer and its
                  affiliated companies.

                           (vi) Fringe Benefits. During the Employment Period,
                  the Employee shall be entitled to fringe benefits, including,
                  without limitation, tax and financial planning services,
                  payment of club dues, and, if applicable, use of an automobile
                  and payment of related expenses, in accordance with the most
                  favorable plans, practices, programs and policies of the
                  Employer and its affiliated companies in effect for the
                  Employee at any time during the 120-day period immediately
                  preceding the Effective Date or, if more favorable to the
                  Employee, as in effect generally at any time thereafter with
                  respect to other peer executives of the Employer and its
                  affiliated companies.

                           (vii) Office and Support Staff. During the Employment
                  Period, the Employee shall be entitled to an office or offices
                  of a size and with furnishings and other appointments, and to
                  exclusive personal secretarial and other assistance, at least
                  equal to the most favorable of the foregoing provided to the
                  Employee by the Employer and its affiliated companies at any
                  time during the 120-day period immediately preceding the
                  Effective Date or, if more favorable to the Employee, as
                  provided generally at any time thereafter with respect to
                  other peer executives of the Employer and its affiliated
                  companies.

                           (viii) Vacation. During the Employment Period, the
                  Employee shall be entitled to paid vacation in accordance with
                  the most favorable plans, policies, programs and practices of
                  the Employer and its affiliated companies as in effect for the
                  Employee at any time during the 120-day period immediately
                  preceding the Effective Date or, if more favorable to the
                  Employee, as in effect generally at any time thereafter with
                  respect to other peer executives of the Employer and its
                  affiliated companies.

         5. Termination of Employment.

         (a) Death or Disability. The Employee's employment shall terminate
automatically upon the Employee's death during the Employment Period. If the

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Employer determines in good faith that the Disability of the Employee has
occurred during the Employment Period (pursuant to the definition of Disability
set forth below), it may give to the Employee written notice in accordance with
Section 14 of this Agreement of its intention to terminate the Employee's
employment. In such event, the Employee's employment with the Employer shall
terminate effective on the 30th day after receipt of such notice by the Employee
(the "Disability Effective Date"), provided that, within the 30 days after such
receipt, the Employee shall not have returned to full-time performance of the
Employee's duties. For purposes of this Agreement, "Disability" shall mean the
absence of the Employee from the Employee's duties with the Employer on a
full-time basis for 180 consecutive business days as a result of incapacity due
to mental or physical illness that is determined to be total and permanent by a
physician selected by the Employer or its insurers and acceptable to the
Employee or the Employee's legal representative.

         (b) Cause. The Employer may terminate the Employee's employment during
the Employment Period for Cause. For purposes of this Agreement, "Cause" shall
mean:

                  (i) the willful and continued failure of the Employee to
         perform substantially the Employee's duties with the Employer or one of
         its affiliates (other than any such failure resulting from incapacity
         due to physical or mental illness), after a written demand for
         substantial performance is delivered to the Employee by the Board or
         the Chief Executive Officer of the Employer that specifically
         identifies the manner in which the Board or the Chief Executive Officer
         believes that the Employee has not substantially performed the
         Employee's duties, or

                  (ii) the willful engaging by the Employee in illegal conduct
         or gross misconduct that is materially and demonstrably injurious to
         the Employer.

For purposes of this provision, no act or failure to act, on the part of the
Employee, shall be considered "willful" unless it is done, or omitted to be
done, by the Employee in bad faith or without reasonable belief that the
Employee's action or omission was in the best interests of the Employer. Any
act, or failure to act, based upon authority given pursuant to a resolution duly
adopted by the Board or upon the instructions of the Chief Executive Officer or
a senior officer of the Employer or based upon the advice of counsel for the
Employer shall be conclusively presumed to be done, or omitted to be done, by
the Employee in good faith and in the best interests of the Employer. The
cessation of employment of the Employee shall not be deemed to be for Cause
unless and until there shall have been delivered to the Employee a copy of a
resolution duly adopted by the affirmative vote of not less than three-quarters
of the entire membership of the Board at a meeting of the Board called and held
for such purpose (after reasonable notice is provided to the Employee and the
Employee is given an opportunity, together with counsel, to be heard before the
Board), finding that, in the good faith opinion of the Board, the Employee is
guilty of the conduct described in subparagraph (i) or (ii) above, and
specifying the particulars thereof in detail.

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                  (c) Good Reason. The Employee's employment may be terminated
         by the Employee for Good Reason. For purposes of this Agreement, "Good
         Reason" shall mean:

                           (i) the assignment to the Employee of any duties
                  inconsistent in any respect with the Employee's position
                  (including status, offices, titles and reporting
                  requirements), authority, duties or responsibilities as
                  contemplated by Section 4(a) of this Agreement, or any other
                  action by the Employer that results in a diminution in such
                  position, authority, duties or responsibilities, excluding for
                  this purpose an isolated, insubstantial and inadvertent action
                  not taken in bad faith and that is remedied by the Employer
                  promptly after receipt of notice thereof given by the
                  Employee;

                           (ii) any failure by the Employer to comply with any
                  of the provisions of Section 4(b) of this Agreement, other
                  than an isolated, insubstantial and inadvertent failure not
                  occurring in bad faith and that is remedied by the Employer
                  promptly after receipt of notice thereof given by the
                  Employee;

                           (iii) the Employer's requiring the Employee to be
                  based at any office or location other than as provided in
                  Section 4(a)(i)(B) hereof or the Employer's requiring the
                  Employee to travel on Employer business to a substantially
                  greater extent than required immediately prior to the
                  Effective Date;

                           (iv) any purported termination by the Employer of the
                  Employee's employment otherwise than as expressly permitted by
                  this Agreement;

                           (v) any failure by the Employer to continue in effect
                  any cash or stock-based incentive or bonus plan, retirement
                  plan, welfare benefit plan or other compensation, retirement
                  or benefit plan, practice, policy, and program, unless the
                  aggregate value (as computed by an independent employee
                  benefits consultant selected by the Employer and acceptable to
                  the Employee or the Employee's legal representative) of all
                  such compensation, retirement or benefit plans, practices,
                  policies and programs provided to the Employee is not
                  materially less than their aggregate value as in effect at any
                  time during the 120-day period immediately preceding the
                  Effective Date or if more favorable to the Employee, those
                  provided generally at any time after the Effective Date to
                  other peer executives of the Employer and its affiliated
                  companies ; or

                           (vi) any failure by the Employer to comply with and
                  satisfy Section 13(c) of this Agreement.

         For purposes of this Section 5(c), any good faith determination of
         "Good Reason" made by the Employee shall be conclusive.

                  (d) Notice of Termination. Any termination by the Employer for
         Cause, or by the Employee for Good Reason, shall be communicated by
         Notice of Termination to the other party hereto given in accordance
         with Section 14 of this Agreement. For purposes of this Agreement, a
         "Notice of Termination" means a written notice that (i) indicates the

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         specific termination provision in this Agreement relied upon, (ii) to
         the extent applicable, sets forth in reasonable detail the facts and
         circumstances claimed to provide a basis for termination of the
         Employee's employment under the provision so indicated and (iii) if the
         Date of Termination (as defined below) is other than the date of
         receipt of such notice, specifies the termination date (which date
         shall be not more than thirty days after the giving of such notice).
         The failure by the Employee or the Employer to set forth in the Notice
         of Termination any fact or circumstance that contributes to a showing
         of Good Reason or Cause shall not waive any right of the Employee or
         the Employer, respectively, hereunder or preclude the Employee or the
         Employer, respectively, from asserting such fact or circumstance in
         enforcing the Employee's or the Employer's rights hereunder.

                  (e) Date of Termination. "Date of Termination" means (i) if
         the Employee's employment is terminated by the Employer for Cause, or
         by the Employee for Good Reason, the date of receipt of the Notice of
         Termination or any later date specified therein, as the case may be,
         (ii) if the Employee's employment is terminated by the Employer other
         than for Cause or Disability, the Date of Termination shall be the date
         on which the Employer notifies the Employee of such termination and
         (iii) if the Employee's employment is terminated by reason of death or
         Disability, the Date of Termination shall be the date of death of the
         Employee or the Disability Effective Date, as the case may be.

         6. Obligations of the Employer upon Termination.

                  (a) Good Reason; Death; Disability; and Other Than for Cause.
         If, during the Employment Period, the Employer shall terminate the
         Employee's employment other than for Cause, the Employee shall
         terminate employment for Good Reason, or the Employee's employment
         shall terminate due to death or Disability:

                           (i) the Employer shall pay to the Employee in a lump
                  sum in cash within 30 days after the Date of Termination the
                  aggregate of the following amounts:

                                    (A) the sum of (1) the Employee's Annual
                           Base Salary through the Date of Termination to the
                           extent not theretofore paid, (2) the product of (x)
                           the higher of (I) the Recent Annual Bonus and (II)
                           the Annual Bonus paid or payable, including any bonus
                           or portion thereof which has been earned but deferred
                           (and annualized for any fiscal year consisting of
                           less than 12 full months or during which the Employee
                           was employed for less than 12 full months), for the
                           most recently completed fiscal year during the
                           Employment Period, if any (such higher amount being
                           referred to as the "Highest Annual Bonus") and (y) a
                           fraction, the numerator of which is the number of
                           days in the current fiscal year through the Date of
                           Termination, and the denominator of which is 365 and
                           (3) any compensation previously deferred by the
                           Employee (together with any accrued interest or
                           earnings thereon) and any accrued vacation pay, in
                           each case to the extent not theretofore paid (the sum
                           of the amounts

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                           described in clauses (1), (2), and (3) shall be
                           hereinafter referred to as the "Accrued
                           Obligations"); and

                                    (B) the amount equal to the product of (1)
                           two and (2) the sum of (x) the Employee's Annual Base
                           Salary and (y) the Highest Annual Bonus;

                           (ii) all stock options, restricted stock or other
                  awards made or granted under the Quanta Services, Inc. 1997
                  Stock Option Plan, the Quanta Services, Inc. 2001 Stock
                  Incentive Plan and/or any similar or successor stock plan or
                  program, will become fully vested immediately on or prior to
                  the Employee's Date of Termination. The Employer agrees that
                  for purposes of determining the continued exercisability of
                  Employee's stock options outstanding on the Date of
                  Termination, Employee shall be considered to have remained
                  employed by the Employer until the second anniversary of the
                  Date of Termination. Nothing in this subparagraph (ii) shall
                  be deemed to extend the expiration date of any stock option
                  granted under the applicable stock plan(s) or program(s) past
                  the original expiration date of such stock option as
                  determined at the time of grant;

                           (iii) for two years after the Employee's Date of
                  Termination, or such longer period as may be provided by the
                  terms of the appropriate plan, program, practice or policy,
                  the Employer shall continue benefits to the Employee and/or
                  the Employee's family at least equal to those that would have
                  been provided to them in accordance with the plans, programs,
                  practices and policies described in Section 4(b)(iv) of this
                  Agreement if the Employee's employment had not been terminated
                  or, if more favorable to the Employee, as in effect generally
                  at any time thereafter with respect to other peer executives
                  of the Employer and its affiliated companies and their
                  families, provided, however, that if the Employee becomes
                  reemployed with another employer and is eligible to receive
                  medical or other welfare benefits under another employer
                  provided plan, the medical and other welfare benefits
                  described herein shall be secondary to those provided under
                  such other plan during such applicable period of eligibility.
                  For purposes of determining eligibility (but not the time of
                  commencement of benefits) of the Employee for retiree benefits
                  pursuant to such plans, practices, programs and policies, the
                  Employee shall be considered to have remained employed until
                  the second anniversary of the Date of Termination and to have
                  retired on the last day of such period;

                           (iv) the Employer shall, at its sole expense as
                  incurred, provide the Employee with outplacement services the
                  scope and provider of which shall be selected by the Employee
                  in his sole discretion;

                           (v) to the extent not theretofore paid or provided,
                  the Employer shall timely pay or provide to the Employee any
                  other amounts or benefits required to be paid or provided or
                  which the Employee is eligible to receive under any plan,
                  program, policy or practice or contract or agreement of the
                  Employer and its

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                  affiliated companies (such other amounts and benefits shall be
                  hereinafter referred to as the "Other Benefits"); and

                           (vi) the covenant of non-competition, and any other
                  restrictive covenants applicable to the Employee under any
                  employment or other agreement between the Employer and the
                  Employee shall cease to apply effective as of the Date of
                  Termination.

                  (b) Death. If the Employee's employment is terminated by
         reason of the Employee's death during the Employment Period, the
         Employer shall pay the amounts and provide the benefits described in
         Section 6(a), pay the Accrued Obligations to the Employee's estate or
         beneficiary, as applicable, in a lump sum in cash within 30 days of the
         Date of Termination, and timely pay or provide the Other Benefits. With
         respect to the provision of Other Benefits, the term Other Benefits as
         utilized in this Section 6(b) shall include, without limitation, and
         the Employee's estate and/or beneficiaries shall be entitled to
         receive, benefits at least equal to the most favorable benefits
         provided by the Employer and affiliated companies to the estates and
         beneficiaries of peer executives of the Employer and such affiliated
         companies under such plans, programs, practices and policies relating
         to death benefits, if any, as in effect with respect to other peer
         executives and their beneficiaries at any time during the 120-day
         period immediately preceding the Effective Date or, if more favorable
         to the Employee's estate and/or the Employee's beneficiaries, as in
         effect on the date of the Employee's death with respect to other peer
         executives of the Employer and its affiliated companies and their
         beneficiaries.

                  (c) Disability. If the Employee's employment is terminated by
         reason of the Employee's Disability during the Employment Period, the
         Employer shall pay the amounts and provide the benefits described in
         Section 6(a), pay the Accrued Obligations to the Employee's estate or
         beneficiary, as applicable, in a lump sum in cash within 30 days of the
         Date of Termination, and timely pay or provide the Other Benefits. With
         respect to the provision of Other Benefits, the term Other Benefits as
         utilized in this Section 6(c) shall include, and the Employee shall be
         entitled after the Disability Effective Date to receive, disability and
         other benefits at least equal to the most favorable of those generally
         provided by the Employer and its affiliated companies to disabled
         executives and/or their families in accordance with such plans,
         programs, practices and policies relating to disability, if any, as in
         effect generally with respect to other peer executives and their
         families at any time during the 120-day period immediately preceding
         the Effective Date or, if more favorable to the Employee and/or the
         Employee's family, as in effect at any time thereafter generally with
         respect to other peer executives of the Employer and its affiliated
         companies and their families.

                  (d) Cause; Other than for Good Reason. If the Employee's
         employment shall be terminated for Cause during the Employment Period,
         this Agreement shall terminate without further obligations to the
         Employee other than the obligation to pay to the Employee (x) his
         Annual Base Salary through the Date of Termination, (y) the amount of
         any compensation previously deferred by the Employee, and (z) Other
         Benefits, in each case to the extent theretofore unpaid. If the
         Employee voluntarily terminates employment during the Employment
         Period, excluding a termination for Good Reason,

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         this Agreement shall terminate without further obligations to the
         Employee, other than for Accrued Obligations and the timely payment or
         provision of Other Benefits. In such case, all Accrued Obligations
         shall be paid to the Employee in a lump sum in cash within 30 days of
         the Date of Termination.

         7. Non-exclusivity of Rights. Nothing in this Agreement shall prevent
or limit the Employee's continuing or future participation in any plan, program,
policy or practice provided by the Employer or any of its affiliated companies
and for which the Employee may qualify, nor, subject to Section 12, shall
anything herein limit or otherwise affect such rights as the Employee may have
under any contract or agreement with the Employer or any of its affiliated
companies. Amounts that are vested benefits or that the Employee is otherwise
entitled to receive under any plan, policy, practice or program of or any
contract or agreement with the Employer or any of its affiliated companies at or
subsequent to the Date of Termination shall be payable in accordance with such
plan, policy, practice or program or contract or agreement except as explicitly
modified by this Agreement.

         8. Full Settlement. The Employer's obligation to make the payments
provided for in this Agreement and otherwise to perform its obligations
hereunder shall not be affected by any set-off, counterclaim, recoupment,
defense or other claim, right or action that the Employer may have against the
Employee or others. In no event shall the Employee be obligated to seek other
employment or take any other action by way of mitigation of the amounts payable
to the Employee under any of the provisions of this Agreement and such amounts
shall not be reduced whether or not the Employee obtains other employment. The
Employer agrees to pay as incurred, to the full extent permitted by law, all
legal fees and expenses that the Employee may reasonably incur as a result of
any contest (regardless of the outcome thereof) by the Employer, the Employee or
others of the validity or enforceability of, or liability under, any provision
of this Agreement or any guarantee of performance thereof (including as a result
of any contest by the Employee about the amount of any payment pursuant to this
Agreement), plus in each case interest on any delayed payment at the applicable
Federal rate provided for in Code Section 7872(f)(2)(A).

         9. Certain Additional Payments by the Employer.

                  (a) Anything in this Agreement to the contrary
         notwithstanding, in the event it shall be determined that any payment
         or distribution by the Employer or its affiliates to or for the benefit
         of the Employee (whether paid or payable or distributed or
         distributable pursuant to the terms of this Agreement or otherwise, but
         determined without regard to any additional payments required under
         this Section 9) (a "Payment") would be subject to the excise tax
         imposed by Code Section 4999 or any interest or penalties are incurred
         by the Employee with respect to such excise tax (such excise tax,
         together with any such interest and penalties, are hereinafter
         collectively referred to as the "Excise Tax"), then the Employee shall
         be entitled to receive an additional payment (a "Gross-Up Payment") in
         an amount such that after payment by the Employee of all taxes
         (including any interest or penalties imposed with respect to such
         taxes), including, without limitation, any income taxes (and any
         interest and penalties imposed with respect thereto) and Excise Tax
         imposed upon the Gross-Up Payment, the Employee retains an amount of
         the Gross-Up Payment equal to the Excise Tax imposed upon the Payments.

                                      -11-
<PAGE>

                  (b) Subject to the provisions of Section 9(c), all
         determinations required to be made under this Section 9, including
         whether and when a Gross-Up Payment is required and the amount of such
         Gross-Up Payment and the assumptions to be utilized in arriving at such
         determination, shall be made by Arthur Andersen or such other certified
         public accounting firm as may be designated by the Employee (the
         "Accounting Firm") which shall provide detailed supporting calculations
         both to the Employer and the Employee within 15 business days of the
         receipt of notice from the Employee that there has been a Payment, or
         such earlier time as is requested by the Employer. In the event that
         the Accounting Firm is serving as accountant or auditor for the
         individual, entity or group effecting the Change of Control, the
         Employee shall appoint another nationally recognized accounting firm to
         make the determinations required hereunder (which accounting firm shall
         then be referred to as the Accounting Firm hereunder). All fees and
         expenses of the Accounting Firm shall be borne solely by the Employer.
         Any Gross-Up Payment, as determined pursuant to this Section 9, shall
         be paid by the Employer to the Employee within five days of the receipt
         of the Accounting Firm's determination. Any determination by the
         Accounting Firm shall be binding upon the Employer and the Employee. As
         a result of the uncertainty in the application of Code Section 4999 at
         the time of the initial determination by the Accounting Firm hereunder,
         it is possible that Gross-Up Payments that will not have been made by
         the Employer should have been made ("Underpayment"), consistent with
         the calculations required to be made hereunder. In the event that the
         Employer exhausts its remedies pursuant to Section 9(c) and the
         Employee thereafter is required to make a payment of any Excise Tax,
         the Accounting Firm shall determine the amount of the Underpayment that
         has occurred and any such Underpayment shall be promptly paid by the
         Employer to or for the benefit of the Employee.

                  (c) The Employee shall notify the Employer in writing of any
         claim by the Internal Revenue Service that, if successful, would
         require the payment by the Employer of the Gross-Up Payment. Such
         notification shall be given as soon as practicable but no later than
         ten business days after the Employee is informed in writing of such
         claim and shall apprise the Employer of the nature of such claim and
         the date on which such claim is requested to be paid. The Employee
         shall not pay such claim prior to the expiration of the 30-day period
         following the date on which it gives such notice to the Employer (or
         such shorter period ending on the date that any payment of taxes with
         respect to such claim is due). If the Employer notifies the Employee in
         writing prior to the expiration of such period that it desires to
         contest such claim, the Employee shall:

                           (i) give the Employer any information reasonably
                  requested by the Employer relating to such claim,

                           (ii) take such action in connection with contesting
                  such claim as the Employer shall reasonably request in writing
                  from time to time, including, without limitation, accepting
                  legal representation with respect to such claim by an attorney
                  reasonably selected by the Employer,

                           (iii) cooperate with the Employer in good faith in
                  order effectively to contest such claim, and

                                      -12-
<PAGE>

                           (iv) permit the Employer to participate in any
                  proceedings relating to such claim;

                  provided, however, that the Employer shall bear and pay
         directly all costs and expenses (including additional interest and
         penalties) incurred in connection with such contest and shall indemnify
         and hold the Employee harmless, on an after-tax basis, for any Excise
         Tax or income tax (including interest and penalties with respect
         thereto) imposed as a result of such representation and payment of
         costs and expenses. Without limitation on the foregoing provisions of
         this Section 9(c), the Employer shall control all proceedings taken in
         connection with such contest and, at its sole option, may pursue or
         forgo any and all administrative appeals, proceedings, hearings and
         conferences with the taxing authority in respect of such claim and may,
         at its sole option, either direct the Employee to pay the tax claimed
         and sue for a refund or contest the claim in any permissible manner,
         and the Employee agrees to prosecute such contest to a determination
         before any administrative tribunal, in a court of initial jurisdiction
         and in one or more appellate courts, as the Employer shall determine;
         provided, however, that if the Employer directs the Employee to pay
         such claim and sue for a refund, the Employer shall advance the amount
         of such payment to the Employee, on an interest-free basis and shall
         indemnify and hold the Employee harmless, on an after-tax basis, from
         any Excise Tax or income tax (including interest or penalties with
         respect thereto) imposed with respect to such advance or with respect
         to any imputed income with respect to such advance; and further
         provided that any extension of the statute of limitations relating to
         payment of taxes for the taxable year of the Employee with respect to
         which such contested amount is claimed to be due is limited solely to
         such contested amount. Furthermore, the Employer's control of the
         contest shall be limited to issues with respect to which a Gross-Up
         Payment would be payable hereunder and the Employee shall be entitled
         to settle or contest, as the case may be, any other issue raised by the
         Internal Revenue Service or any other taxing authority.

                  (d) If, after the receipt by the Employee of an amount
         advanced by the Employer pursuant to Section 9(c), the Employee becomes
         entitled to receive any refund with respect to such claim, the Employee
         shall (subject to the Employer's complying with the requirements of
         Section 9(c)) promptly pay to the Employer the amount of such refund
         (together with any interest paid or credited thereon after taxes
         applicable thereto). If, after the receipt by the Employee of an amount
         advanced by the Employer pursuant to Section 9(c), a determination is
         made that the Employee shall not be entitled to any refund with respect
         to such claim and the Employer does not notify the Employee in writing
         of its intent to contest such denial of refund prior to the expiration
         of 30 days after such determination, then such advance shall be
         forgiven and shall not be required to be repaid and the amount of such
         advance shall offset, to the extent thereof, the amount of Gross-Up
         Payment required to be paid.

         10. Confidential Information. The Employee shall hold in a fiduciary
capacity for the benefit of the Employer all secret or confidential information,
knowledge or data relating to the Employer or any of its affiliated companies,
and their respective businesses, which shall have been obtained by the Employee
during the Employee's employment by the Employer or any of its affiliated
companies and which shall not be or become public knowledge (other than by acts

                                      -13-
<PAGE>

by the Employee or representatives of the Employee in violation of this
Agreement). After termination of the Employee's employment with the Employer,
the Employee shall not, without the prior written consent of the Employer or as
may otherwise be required by law or legal process, communicate or divulge any
such information, knowledge or data to anyone other than the Employer and those
designated by it. In no event shall an asserted violation of the provisions of
this Section 10 constitute a basis for deferring or withholding any amounts
otherwise payable to the Employee under this Agreement.

         11. Insurance and Indemnification. For the period from the Effective
Date through at least the tenth anniversary of the Employee's termination of
employment from the Employer, the Employer shall maintain the Employee as an
insured party on all directors' and officers' insurance maintained by the
Employer for the benefit of its directors and officers on at least the same
basis as all other covered individuals and provide the Employee with at least
the same corporate indemnification as it provides to the peer executives of the
Employer.

         12. Earlier Employment Agreement. Except as provided in the following
sentence, from and after the Effective Date, this Agreement shall supersede any
other agreement between the parties with respect to the subject matter hereof.
The Employee may elect in writing to have any term, provision and/or definition
under the Employees' Earlier Employment Agreement apply in lieu of any similar
term, provision and/or definition of this Agreement, except to the extent that
such application would produce duplicate payments or benefits under this
Agreement and such Earlier Employment Agreement. All determinations required to
be made under this Section, including whether and when a term, provision and/or
definition under the Employees' Earlier Employment Agreement would produce
duplicate payments or benefits under this Agreement and such Earlier Employment
Agreement and the assumptions to be utilized in arriving at such determination,
shall be made by the Accounting Firm or such other nationally recognized
compensation and benefits consulting firm as the Employee may designate, which
shall provide detailed supporting calculations both to the Employer and the
Employee within 15 business days of the receipt of written notice from the
Employee, or such earlier time as is requested by the Employer. All fees and
expenses of the Accounting Firm (or such other firm designated) shall be borne
solely by the Employer.

         13. Successors.

                  (a) This Agreement is personal to the Employee and without the
         prior written consent of the Employer shall not be assignable by the
         Employee otherwise than by will or the laws of descent and
         distribution. This Agreement shall inure to the benefit of and be
         enforceable by the Employee's legal representatives.

                  (b) This Agreement shall inure to the benefit of and be
         binding upon the Employer and its successors and assigns.

                  (c) The Employer will require any successor (whether direct or
         indirect, by purchase, merger, consolidation or otherwise) to all or
         substantially all of the business and/or assets of the Employer to
         assume expressly and agree to perform this Agreement in the same manner
         and to the same extent that the Employer would be required to perform
         it if no such succession had taken place. As used in this Agreement,
         "Employer"

                                      -14-
<PAGE>

         shall mean the Employer as hereinbefore defined and any successor to
         its business and/or assets as aforesaid which assumes and agrees to
         perform this Agreement by operation of law, or otherwise.

         14. Notice. Any notice required pursuant to this Agreement will be in
writing and will be deemed given upon the earlier of (i) delivery thereof, if by
hand, (ii) three business days after mailing if sent by mail (registered or
certified mail, postage prepaid, return receipt requested), (iii) the next
business day after deposit if sent by a recognized overnight delivery service,
or (iv) upon transmission if sent by facsimile transmission or by electronic
mail, with return notification (provided that any notice sent by facsimile or
electronic mail shall also promptly be sent by one of the means described in
clauses (i) through (iii) of this Section. Any notice or document required to be
given or filed with the Employer is properly given or filed if delivered to the
Employer at 1360 Post Oak Boulevard, Suite 2100, Houston, Texas 77056,
Attention: General Counsel. Any notice or document required to be given or filed
with a Employee is properly given or filed if delivered to the Employee at the
most recent address shown on the Employer's records. A party may change its
address for notice by the giving of notice thereof in the manner hereinabove
provided.

         15. Severability, Headings. If any portion of this Agreement is held
invalid or inoperative, the other portions of this Agreement. shall be deemed
valid and operative and, so far as is reasonable and possible, effect shall be
given to the intent manifested by the portion held invalid or inoperative. The
section headings herein are for reference purposes only and are not intended in
any way to describe, interpret, define or limit the extent or intent of the
Agreement or of any part hereof.

         16. Arbitration. Any further dispute or controversy arising under or in
connection with this Agreement shall be settled exclusively by arbitration in
Houston, Texas, in accordance with the rules of the American Arbitration
Association for the Resolution of Employment Disputes in effect on the date of
the event giving rise to the claim or the controversy; provided, however, that
the evidentiary standards set forth in this Agreement shall apply. Judgment may
be entered on the arbitrator's award in any court having jurisdiction.
Notwithstanding any provision of this Agreement to the contrary, the Employee
shall be entitled to seek specific performance of the Employee's right to be
paid until the Employee's Date of Termination during the pendency of any dispute
or controversy arising under or in connection with this Agreement. A decision by
a majority of the arbitration panel shall be final and binding. The direct
expense of any arbitration proceeding shall be borne by Employer.

         17. Governing Law. This Agreement shall in all respects be construed
according to the laws of the State of Texas, without reference to principles of
conflict of laws. The captions of this Agreement are not part of the provisions
hereof and shall have no force or effect. This Agreement may not be amended or
modified otherwise than by a written agreement executed by the parties hereto or
their respective successors and legal representatives.

         18. Withholding. The Employer may withhold from any amounts payable
under this Agreement such Federal, state, local or foreign taxes as shall be
required to be withheld pursuant to any applicable law or regulation.

                                      -15-
<PAGE>

         19. No Waiver. The Employee's or the Employer's failure to insist upon
strict compliance with any provision of this Agreement or the failure to assert
any right the Employee or the Employer may have hereunder, including, without
limitation, the right of the Employee to terminate employment for Good Reason,
shall not be deemed to be a waiver of such provision or right or any other
provision or right of this Agreement.

         20. Claims. All claims by the Employee for payments or benefits under
this Agreement shall be directed to and determined by the Employer's Board of
Directors (or such committee to which the Board delegates authority under this
Section) and shall be in writing. Any denial by the Board (or such committee) of
a claim for benefits under this Agreement shall be delivered to the Employee in
writing and shall set forth the specific reasons for the denial and the specific
provisions of this Agreement relied upon. The Board (or committee) shall afford
the Employee a reasonable opportunity for a review of the decision denying a
claim and shall further allow the Employee to appeal the decision within 60 days
after the Board (or committee) gives notice that it has denied Employee's claim.

         21. Counterparts. This Agreement may be executed simultaneously in two
or more counterparts, each of which shall be deemed an original and all of which
together shall constitute but one and the same instrument.

                  IN WITNESS WHEREOF, the Employee has hereunto set the
Employee's hand and, pursuant to the authorization from its Board of Directors,
the Employer has caused these presents to be executed in its name on its behalf,
all as of the day and year first above written.

                                                QUANTA SERVICES, INC.

                                                /s/ JAMES F. O'NEIL III
                                                -----------------------
                                                JAMES F. O'NEIL III

By: /s/ JOHN R. COLSON
    ---------------------------------------
    John R. Colson, Chief Executive Officer

                                      -16-<PAGE>
                                                                  EXHIBIT 10.33

                                 AMENDMENT NO. 1
                                       TO
                             NOTE PURCHASE AGREEMENT

         This AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT (this "Amendment"),
dated as of August 12, 2002, is made by and among each of QUANTA SERVICES, INC.,
a Delaware corporation (the "Company") and each of the institutions listed on
Annex 1 hereto (such institutions being collectively referred to as the
"Noteholders").

                                   BACKGROUND

         1. The Company and certain of the Noteholders are parties to that
certain Note Purchase Agreement (the "Original Note Purchase Agreement"), dated
as of March 1, 2000, that provides, among other things, for the sale by the
Company and the purchase by certain of the Noteholders of up to (a)
Seventy-Three Million Dollars ($73,000,000) in aggregate principal amount of the
Company's 8.46% Series 2000-A Senior Secured Notes, Tranche 1, due March 1, 2005
(the "Series A-1 Notes"), (b) Forty-One Million Five Hundred Thousand Dollars
($41,500,000) in aggregate principal amount of the Company's 8.55% Series 2000-A
Senior Secured Notes, Tranche 2, due March 1, 2007 (the "Series A-2 Notes") and
(c) Thirty-Five Million Five Hundred Thousand Dollars ($35,500,000) in aggregate
principal amount of the Company's 8.61% Series 2000-A Senior Secured Notes,
Tranche 3, due March 1, 2010 (the "Series A-3 Notes" and, collectively with the
Series A-1 Notes and the Series A-2 Notes, the "Series A Notes"). All of the
Series A Notes are currently outstanding.

         2. The Original Note Purchase Agreement has been supplemented in
certain respects pursuant to a First Supplement to Note Purchase Agreement (the
"First Supplement" and, together with the Original Note Purchase Agreement, the
"Existing Note Purchase Agreement"), dated as of September 1, 2000, by and among
the Company and certain of the Noteholders, that provides, among other things,
for the sale by the Company and the purchase by certain of the Noteholders of up
to (a) Thirty Million Dollars ($30,000,000) in aggregate principal amount of the
Company's 8.01% Series 2000-B Senior Secured Notes, Tranche 1, due September 1,
2005 (the "Series B-1 Notes"), (b) Five Million Dollars ($5,000,000) in
aggregate principal amount of the Company's 8.06% Series 2000-B Senior Secured
Notes, Tranche 2, due September 1, 2006 (the "Series B-2 Notes") and (c)
Twenty-Five Million Dollars ($25,000,000) in aggregate principal amount of the
Company's 8.29% Series 2000-B Senior Secured Notes, Tranche 3, due September 1,
2010 (the "Series B-3 Notes" and, collectively with the Series B-1 Notes and the
Series B-2 Notes, the "Series B Notes" and the Series B Notes, together with the
Series A Notes, the "Notes"). All of the Series B Notes are currently
outstanding.

         3. The Company has requested of the Noteholders that the Existing Note
Purchase Agreement and the Notes be amended to the effect and as set forth in
this Amendment.

         NOW, THEREFORE, in order to induce the Noteholders to amend the
Existing Note Purchase Agreement and the Notes and for other good and valuable
consideration (the receipt and sufficiency of which are hereby acknowledged),
the Company agrees with the Noteholders as follows:

SECTION 1. DEFINED TERMS.

         All capitalized terms used, but not specifically defined, in this
Amendment have the respective meanings assigned to them in the Existing Note
Purchase Agreement.

<PAGE>

SECTION 2. WARRANTIES AND REPRESENTATIONS.

         The Company warrants and represents to each Noteholder that as of the
date of this Amendment and as of the Effective Date (as defined in Section 3):

         2.1 CORPORATE ORGANIZATION AND AUTHORITY. The Company is a corporation
duly organized, validly existing and in good standing under the laws of its
jurisdiction of incorporation, and is duly qualified as a foreign corporation
and is in good standing in each jurisdiction in which such qualification is
required by law, other than those jurisdictions as to which the failure to be so
qualified or in good standing could not, individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect. The Company has the
corporate power and authority to transact the business it transacts and proposes
to transact, to execute and deliver this Amendment and to perform the provisions
hereof.

         2.2 NO MATERIAL ADVERSE CHANGE. Since December 31, 2001, except as
disclosed in writing to the Noteholders, there has been no change in the
business, operations, affairs, financial condition, assets or properties of the
Company except for

                  (a) changes in general, economic, market and industry
         conditions that are generally applicable to the Company and all other
         Persons that are in the same or similar businesses as the Company and
         are similarly situated, and

                  (b) changes in the ordinary course of business,

that in the aggregate for all such changes, could not reasonably be expected to
have a Material Adverse Effect.

         2.3 FULL DISCLOSURE. Each written statement and all written materials
furnished by, or on behalf of, the Company to the Noteholders pursuant to
Sections 7.1 and 7.2 of the Existing Note Purchase Agreement, taken as a whole,
and each written statement and all written materials furnished by, or on behalf
of, the Company to the Noteholders in connection with this Amendment, taken as a
whole, do not contain any untrue statement of a material fact or omit a material
fact necessary to make the statements contained therein not misleading in light
of the circumstances made. There is no fact known to the Company which the
Company has not disclosed to the Noteholders in writing which could reasonably
be expected to have a Material Adverse Effect.

         2.4 TRANSACTION IS LEGAL AND AUTHORIZED. The execution and delivery of
this Amendment by the Company, the consummation of each of the transactions
contemplated by this Amendment and the compliance by the Company with all the
provisions of this Amendment:

                  (a) are within the corporate powers of the Company;

                  (b) are in compliance with applicable law;

                  (c) do not conflict with, result in any breach in any of the
         provisions of, constitute a default under, or result in the creation of
         any Lien upon any property of the Company under the

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       2
<PAGE>

provisions of, any order, judgment, decree, or ruling of any court, arbitrator
or Governmental Authority applicable to the Company; and

                  (d) do not conflict with, result in any material breach of any
         of the provisions of, constitute a material default under, or result in
         the creation of any Lien not permitted by Section 10.5 of the Existing
         Note Purchase Agreement upon any property of the Company under the
         provisions of, any agreement, indenture, charter instrument, bylaw or
         other constitutive document or instrument to which it is a party or by
         which it or any of its property is bound.

         2.5 AMENDMENT IS ENFORCEABLE. This Amendment is a legal, valid and
binding and enforceable obligation of the Company, enforceable against the
Company in accordance with its terms, except as the enforceability hereof may be
limited by applicable bankruptcy, reorganization, arrangement, insolvency,
moratorium or other similar laws affecting the enforceability of creditors'
rights generally and the application of general equitable principles.

         2.6 NO DEFAULTS. The Company is not in violation in any respect of any
term in any agreement or other instrument to which it is a party or by which it
or any of its property may be bound, except for such violations that, in the
aggregate for all such violations, could not reasonably be expected to have a
Material Adverse Effect.

         2.7 PENDING LITIGATION.

                  (a) There are no proceedings, actions or investigations
         pending, or to the knowledge of the Company, threatened against or
         affecting the Company in any court or before any Governmental Authority
         or arbitration board or tribunal that, in the aggregate for all such
         proceedings, actions and investigations, could reasonably be expected
         to have a Material Adverse Effect.

                  (b) The Company is not in default with respect to any
         judgment, order, writ, injunction or decree of any court, Governmental
         Authority, arbitration board or tribunal that, in the aggregate for all
         such defaults, could reasonably be expected to have a Material Adverse
         Effect.

         2.8 COMPLIANCE WITH LAW. The Company is not in violation of any law,
ordinance, governmental rule or regulation to which it is subject, except for
such violations that, in the aggregate for all such violations, could not
reasonably be expected to have a Material Adverse Effect.

         2.9 NO DEFAULTS. After giving effect to this Amendment, no Default or
Event of Default will exist.

SECTION 3. CONDITIONS PRECEDENT.

         This Amendment shall have no effect until all of the following
conditions precedent shall have been fulfilled (such time of effectiveness being
herein referred to as the "Effective Date"):

                  (a) WARRANTIES AND REPRESENTATIONS TRUE. After giving effect
         to this Amendment, the warranties and representations set forth in the
         Existing Note Purchase Agreement and in Section 2

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       3
<PAGE>

         to this Amendment shall be true in all material respects (unless
         specifically limited to an earlier date, in which case, such
         representations and warranties were true as of such date).

                  (b) NO PROHIBITED ACTION. No Default or Event of Default shall
         exist after giving effect to, the consummation of the transactions
         contemplated by this Amendment.

                  (c) CONSENT OF REQUIRED HOLDERS. The Company and the Required
         Holders shall have executed this Amendment.

                  (d) OPINIONS OF COUNSEL. The Noteholders shall have received
         legal opinions from General Counsel and special counsel to Company and
         the Guarantors, in form and substance satisfactory to them.

                  (e) AMENDMENT OF BANK CREDIT AGREEMENT. An Eighth Amendment to
         the Third Amended and Restated Secured Credit Agreement among the
         Company, as Borrower, the Financial Institutions party thereto, as
         Lenders, Bank of America, N.A., as Administrative Agent, and the other
         agents named therein (as amended, the "Bank Credit Agreement") shall
         have been entered into by the Company and the Majority Lenders (as such
         term is defined in the Bank Credit Agreement), shall contain terms
         satisfactory to the Noteholders, and shall be in full force and effect,
         subject only to the effectiveness of this Amendment.

                  (f) COMPLIANCE CERTIFICATES. The Secretary or Assistant
         Secretary and the President or the Vice President of the Company and
         each Guarantor shall have delivered to each Noteholder a certificate,
         dated the date hereof, certifying as to the resolutions attached
         thereto and other corporate proceedings relating to the authorization,
         execution and delivery of this Amendment or its consent, as applicable,
         containing substantially the substance of Attachment A hereto.

                  (g) PAYMENT OF NOTEHOLDER FEES AND EXPENSES. The Company shall
         have paid all fees and expenses of the Noteholders incurred in
         connection with this Amendment for which invoices have been delivered,
         including the fees and expenses of Bingham McCutchen LLP and Chapman &
         Cutler.

                  (h) GUARANTORS' CONSENT. The Guarantors shall have executed
         and delivered the Consent attached hereto as Attachment B.

                  (i) PAYMENT OF AMENDMENT FEE. The Company shall have paid each
         Noteholder an amendment fee equal to 0.375% of the aggregate
         outstanding principal amount of the Notes held by such Noteholder.

                  (j) PROCEEDINGS SATISFACTORY. All proceedings taken in
         connection with the execution and delivery of this Amendment and the
         transactions contemplated hereby shall be satisfactory to the
         Noteholders and their special counsel; and the Noteholders and their
         special counsel shall have received copies of such documents and papers
         as they may reasonably request in connection with the execution and
         delivery of this Amendment.

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       4
<PAGE>

SECTION 4. AFFIRMATIVE COVENANTS

         4.1 COLLATERAL REVIEW. Within sixty (60) days of the Effective Date,
the Noteholders shall select a nationally recognized accounting firm (the
"Financial Advisor") to perform a review of the Company's finances including,
without limitation, a review of the Collateral and an examination of the
Company's and its Subsidiaries' accounts receivable, work-in-process, backlog
and other matters reasonably requested by the Noteholders. The Company shall pay
all reasonable fees and expenses of the Financial Advisor.

         4.2 REAL ESTATE COLLATERAL. Without limiting the terms, covenants,
conditions or other obligations set forth in Section 9.6 of the Existing Note
Purchase Agreement, within sixty (60) days of the Effective Date, the Company
shall, and shall cause its Subsidiaries to, execute and deliver mortgages or
deeds or trust, as applicable, and in form and substance satisfactory to the
Required Holders, granting to the Collateral Agent for the benefit of the Bank
Lenders and the Noteholders, a first priority Lien upon, and security interest
in, the real property owned by the following Subsidiaries:

                  (i)      Dillard Smith Construction Company,

                  (ii)     Golden State Utility Co.,

                  (iii)    H.L. Chapman Pipeline Construction, Inc.,

                  (iv)     Mears Group, Inc.

                  (v)      North Houston Pole Line, L.P.,

                  (vi)     PAR Electrical Contractors, Inc.

                  (vii)    Potelco, Inc.,

                  (viii)   R.A. Waffensmith & Company, Inc.

                  (ix)     Sumter Utilities, Inc.

                  (x)      Underground Construction Co., Inc.

Such property shall be subject to no other Liens than Liens permitted by Section
10.5 of the Existing Note Purchase Agreement. In addition, the Company shall, at
its sole cost and expense, deliver such surveys, mortgagee title policies,
environmental assessment reports, evidence of insurance from an insurer
acceptable to the Required Holders naming the Collateral Agent (as such term is
defined in the Intercreditor Agreement) as "loss payee" and "additional
insured", as the case may be, and other related documents reasonably requested
by the Required Holders, in each case in form and substance satisfactory to the
Required Holders.

         4.3 NOTICE OF INTEREST RATE CHANGES. Within sixty (60) days after the
end of each quarterly fiscal period in each fiscal year, the Company shall
provide each Noteholder with a calculation of the Applicable Margin for such
quarterly fiscal period, which, in the case of the first three fiscal quarters
of each

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       5
<PAGE>

fiscal year, may be included in the compliance certificate required by Section
7.2(a) of the Existing Note Purchase Agreement.

         4.4 SPECIAL PREPAYMENT OF PRINCIPAL. Promptly after the receipt
thereof, the Company shall apply:

                  (a) one hundred percent (100%) of the net proceeds from
         collections of that portion of any accounts receivable owed by account
         debtors previously specified in writing to the Noteholders that have
         been written off as doubtful of collection and which are included in
         the definition of "Permitted Charges", and

                  (b) one hundred percent (100%) of the net proceeds of asset
         sales made pursuant to Section 10.7(d) or Section 10.7(e),

         in each case, to prepayment of the principal amount of the Notes and
         the Debt under the Bank Credit Agreement, pro-rata, based upon the Bank
         Lenders' (as such term is defined in the Bank Credit Agreement)
         Commitment Amount at such time and the aggregate outstanding principal
         amount of the Notes at such time. Modified Make-Whole Amount shall be
         due and payable, from such proceeds, with respect to any such
         prepayment of Notes under this Section 4.4. Amounts paid to the
         Noteholders pursuant to this Section 4.4 shall be applied first to the
         applicable Modified Make-Whole Amount and the remainder to the
         principal amount of the Notes. For purposes of this Section 4.4, "net
         proceeds" shall mean all proceeds of such sale or other disposition net
         of usual and customary transaction costs and expenses actually incurred
         in connection with such sale or disposition.

SECTION 5. AMENDMENTS TO EXISTING NOTE PURCHASE AGREEMENT.

         5.1 The definition of "Change of Control" contained in Section 8.7(h)
of the Existing Note Purchase Agreement is hereby amended by adding the
following after "directors" appearing in the eighth line thereof:

                  "; or, individuals who on June 14, 1999, constituted the
                  Company's Board of Directors, or their approved successors,
                  cease for any reason to constitute at least a majority of the
                  Company's Board of Directors. An approved successor is a new
                  director elected when the election or nomination for the
                  election by the Company's stockholders of such new director
                  was approved by a vote of at least two-thirds of the directors
                  then still in office who were directors on June 14, 1999, or
                  their approved successors."

         5.2 Article 9 of the Existing Note Purchase Agreement is hereby amended
by adding the following new Section 9.7:

                  "9.7. Maintenance of Most Favored Lender Status. The Company
         hereby acknowledges and agrees that if, on or before June 30, 2004, the
         Company shall enter into any agreement or amendment with any lender or
         holder of its Funded Debt which provides, for the benefit of any such
         lender or holder, any covenant that is in addition to, or more
         favorable to such Person than, the covenants contained in this
         Agreement, then, and in each and any such event, the covenants in this
         Agreement shall be, and shall be deemed to be, without any further
         action on the

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       6
<PAGE>

         part of the Company or any other Person being necessary or required,
         amended to afford the holders of the Notes the same benefits and rights
         with respect to such matters as such agreements or amendments provide
         to any such other lender or holder. In addition, if, on or before June
         30, 2004, the Company amends the Bank Credit Agreement to increase the
         Applicable Margin paid to the Bank Lenders thereunder, the Company will
         execute and deliver to the Noteholders an amendment to this Agreement
         to provide the Noteholders a corresponding increase in the Applicable
         Margin. The Company will promptly deliver to each holder of Notes a
         copy of each such agreement or amendment entered into after the date
         hereof. Without limiting the effectiveness of the first sentence of
         this Section 9.7, the Company agrees, no later than thirty (30) days
         following the date of such agreement or amendment, to enter into such
         documentation as the Required Holders may reasonably request to
         evidence the amendments provided for in this Section 9.7."

         5.3 Section 10.1 of the Existing Note Purchase Agreement is hereby
amended and restated in its entirety to read as follows:

                  "Section 10.1 Minimum Consolidated Net Worth. Prior to June
         30, 2004, the Company will maintain a minimum Consolidated Net Worth of
         not less than an amount equal to the sum of (a) 90% of Consolidated Net
         Worth as of June 30, 2002 (determined without giving effect to any
         adjustments made in accordance with FAS 142), plus (b) for each fiscal
         quarter ended prior to (but not on) such date of determination,
         commencing with the fiscal quarter ended June 30, 2002, the sum of (i)
         an amount equal to 75% of Consolidated Net Income for such fiscal
         quarter, if positive, plus (ii) an amount equal to 100% of the amount
         of any equity issuance by the Company, including equity issued in a
         secondary offering or equity issued to acquire another entity in an
         Acquisition, minus (iii) any distributions to shareholders of any
         Subchapter S corporation acquired in an Acquisition as a result of
         operations of such corporation prior to the closing of the Acquisition,
         minus (iv) Permitted Charges referenced in clauses (a) and (b) of such
         definition which are applicable to such period, and minus (v) charges
         taken in accordance with FAS 142 in conformity with GAAP at any time
         during the period from June 30, 2002 to and including June 30, 2004,
         which do not exceed $800,000,000 in the aggregate. Increases in
         Consolidated Net Worth required after June 30, 2002 shall be
         appropriately adjusted to eliminate any adverse effects on the
         Consolidated Net Worth of the Company occasioned by the expensing of
         Modified Make-Whole Amounts paid pursuant to Section 4.4 of Amendment
         No. 1. The calculation of Consolidated Net Worth under this Section
         10.1 shall not take into consideration the non-cash charges related to
         the Company's stock option program or stock compensation plan required
         to be taken pursuant to GAAP". Subsequent to June 30, 2004, the
         foregoing provisions of this Section 10.1 shall continue to be
         applicable in all respects except that the percentage of Consolidated
         Net Income required to be added each quarter shall be reduced from 75%
         to 50%.

         5.4 Section 10.2 of the Existing Note Purchase Agreement is hereby
amended and restated in its entirety to read as follows:

                  "Section 10.2. Limitation on Consolidated Debt. The Company
         will not, as of the final day of any period of four consecutive fiscal
         quarters of the Company ending at any time during any period specified
         below, permit the ratio of Funded Debt at such time to EBITDA for the

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       7
<PAGE>

         trailing four quarter period (in each case for the Company and its
         Subsidiaries on a consolidated basis) to be greater than the ratio set
         forth below opposite such period:

<Table>
<Caption>
PERIOD                                                           RATIO
------                                                           -----
<S>                                                              <C>
June 30, 2002                                                    3.50 to 1.00
July 1, 2002 through September 30, 2002                          4.30 to 1.00
October 1, 2002 through December 31, 2002                        4.40 to 1.00
January 1, 2003 through March 31, 2003                           4.50 to 1.00
April 1, 2003 through June 30, 2003                              4.10 to 1.00
July 1, 2003 through September 30, 2003                          4.00 to 1.00
October 1, 2003 and at all times thereafter                      3.50 to 1.00"
</Table>

         5.5 Section 10.4 of the Existing Note Purchase Agreement is hereby
amended and restated in its entirety to read as follows:

                  "Section 10.4. Minimum Interest Coverage Ratio. The Company
         will not, for any period of four consecutive fiscal quarters of the
         Company ending at any time during any period specified below, permit
         the Minimum Interest Coverage Ratio to be less than the ratio set forth
         below opposite such period:

<Table>
<Caption>
PERIOD                                                           RATIO
------                                                           -----
<S>                                                              <C>
June 30, 2002                                                    3.00 to 1.00
July 1, 2002 through September 30, 2002                          2.40 to 1.00
October 1, 2002 through December 31, 2002                        2.00 to 1.00
January 1, 2003 through March 31, 2003                           1.70 to 1.00
April 1, 2003 through June 30, 2003                              1.90 to 1.00
July 1, 2003 through September 30, 2003                          2.10 to 1.00
October 1, 2003 through June 30, 2004                            2.30 to 1.00
July 1, 2004 and at all times thereafter                         2.50 to 1.00"
</Table>

         5.6 Section 10.7 of the Existing Note Purchase Agreement is hereby
amended and restated in its entirety to read as follows:

                  "Section 10.7. Sale of Assets. The Company will not, and will
         not permit any Subsidiary to, sell, lease or otherwise dispose of any
         of the assets of the Company and its Subsidiaries; except for:

                  (a) transfers of inventory in the ordinary course of business;

                  (b) retirement or replacement of assets (with assets of equal
                  or greater value) in the ordinary course of business;

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       8
<PAGE>

                  (c) transfers of any assets (i) to a non-domestic Subsidiary
                  of the Company not to exceed $5,000,000 in the aggregate; and
                  (ii) among the Company and any of its domestic subsidiaries.

                  (d) sales, transfers or conveyances of accounts receivable for
                  fair and adequate consideration and for cash; provided that
                  all proceeds from the sale, transfer or conveyance of such
                  assets are applied in accordance with Section 4.4 of Amendment
                  No. 1; and

                  (e) dispositions which generate net proceeds of up to (i)
                  $50,000,000 in the aggregate during the period from the
                  Effective Date through June 14, 2004, and (ii) $50,000,000 in
                  any period of twelve (12) consecutive months during the period
                  from June 15, 2004, through September 1, 2010; provided that
                  the aggregate net proceeds generated by asset dispositions
                  during the period June 15, 2004 through September 1, 2010
                  shall not exceed $150,000,000; and provided further that one
                  hundred percent (100%) of all such proceeds received on and
                  after the Effective Date shall be applied in accordance with
                  Section 4.4 of Amendment No. 1."

         5.7 Section 10.9 of the Existing Note Purchase Agreement is hereby
amended and restated in its entirety to read as follows:

                  "Section 10.9. Transactions with Affiliates. The Company will
         not and will not permit any Subsidiary to enter into directly or
         indirectly any Material transaction or Material group of related
         transactions (including without limitation the purchase, lease, sale or
         exchange of properties of any kind or the rendering of any service)
         with any Affiliate (other than the Company or another Subsidiary),
         except upon fair and reasonable terms no less favorable to the Company
         or such Subsidiary than would be obtainable in a comparable
         arm's-length transaction with a Person not an Affiliate.
         Notwithstanding anything in this Section 10.9 to the contrary, neither
         the Company nor any of its Subsidiaries shall, at any time, make or
         have outstanding any loans or advances to any employee, stockholder,
         officer or director of the Company or any of its Subsidiaries, except
         loans and advances which do not at any time aggregate more than
         $2,000,000 at any time outstanding prior to June 30, 2004, and more
         than $5,000,000 at any time outstanding thereafter and which are made
         in compliance with all applicable laws and regulations.

         5.8 Article 10 of the Existing Note Purchase Agreement is hereby
amended by adding the following new Section 10.11:

                  "Section 10.11. Maximum Senior Debt to EBITDA. The Company
         will not, as of the final day of any period of four consecutive fiscal
         quarters of the Company ending at any time during any period specified
         below, permit the ratio of Senior Debt at such time to EBITDA for the
         trailing four quarter period (in each for the Company and its
         Subsidiaries on a consolidated basis) to be greater than the ratio set
         forth below opposite such period:

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       9
<PAGE>

<Table>
<Caption>
PERIOD                                                           RATIO
------                                                           -----
<S>                                                              <C>
June 30, 2002                                                    3.00 to 1.00
July 1, 2002 through March 31, 2003                              3.10 to 1.00
April 1, 2003 through June 30, 2003                              2.80 to 1.00
July 1, 2003 through September 30, 2003                          2.75 to 1.00
October 1, 2003 through June 30, 2004                            2.50 to 1.00
July 1, 2004 and thereafter                                      2.75 to 1.00"
</Table>

         5.9 Article 10 of the Existing Note Purchase Agreement is hereby
amended by adding the following new Section 10.12:

                  "Section 10.12. Minimum Asset Coverage. The Company will not,
         on the final day of any month ending during any period specified below,
         permit the Minimum Asset Coverage Ratio to be less than the ratio set
         forth below opposite such period:

<Table>
<Caption>
PERIOD                                                           RATIO
------                                                           -----
<S>                                                              <C>
Effective Date through December 31, 2002                         1.55 to 1.00
January 1, 2003 through June 30, 2004                            1.65 to 1.00
July 1, 2004 and thereafter                                      1.50 to 1.00"
</Table>

         5.10 Article 10 of the Existing Note Purchase Agreement is hereby
amended by adding the following new Section 10.13:

                  "Section 10.13. Limitation on Acquisitions. Neither the
         Company nor any Subsidiary shall make an Acquisition prior to January
         1, 2005."

         5.11 Article 10 of the Existing Note Purchase Agreement is hereby
amended by adding the following new Section 10.14:

                  "Section 10.14. Limitation on Restricted Payments. The Company
         shall make no Restricted Payment prior to September 21, 2005 other than
         required dividends in respect of currently outstanding Preferred Stock,
         not to exceed $1,000,000 in any year. Thereafter, the Company may make
         aggregate Restricted Payments each year of up to $3,000,000, and may
         make Restricted Payments in excess of $3,000,000 in any year to the
         extent that the aggregate amount of such payments in excess of
         $3,000,000 made after September 21, 2005, does not at any time exceed
         the sum of (i) 50% of Consolidated Net Income generated, plus (ii) 50%
         of the net proceeds received by the Company from sales of its equity
         securities, in each case subsequent to December 31, 2003, plus (iii)
         $10,000,000. Anything to the contrary in the foregoing notwithstanding,
         the Company shall make no Restricted Payment at any time if a Default
         or Event of Default exists or would exist after giving effect to such
         payment."

         5.12 Article 10 of the Existing Note Purchase Agreement is hereby
amended by adding the following new Section 10.15:

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       10
<PAGE>

                  "Section 10.15. Capital Expenditures Limitation. (a) Neither
                  the Company nor any of its Subsidiaries shall make or commit
                  to make Capital Expenditures greater than (i) for fiscal year
                  2002, $60,000,000, (ii) for fiscal year 2003 and 2004,
                  $50,000,000 and (iii) for each fiscal year thereafter,
                  $85,000,000. No portion of any annual limit may be carried
                  forward to a subsequent fiscal year.

                           (b) In addition to the annual limits under subsection
                  (a) of this Section 10.15, if the Company executes an eligible
                  contract, then the Company may make Capital Expenditures in
                  respect of such contract in an amount equal to the lesser of
                  (i) the actual amount required by such contract, and (ii)
                  $15,000,000, provided that, (A) in respect of each such
                  contract, Capital Expenditures not made within 12 months after
                  the date of such contract shall be applied against the annual
                  limits under subsection (a) of this Section 10.15, and (B) the
                  amount of Capital Expenditures under this Section 10.15(b) for
                  all such contracts may not, in the aggregate, exceed
                  $15,000,000 in any fiscal year. Upon execution of each
                  eligible contract, the Company shall promptly deliver a copy
                  of such contract to each Noteholder, together with a summary
                  of the Capital Expenditures required by such contract in form
                  and detail acceptable to the Noteholders. As used in this
                  Section 10.15(b), "eligible contract" means, a utility
                  outsourcing contract with revenues to the Company of at least
                  $75,000,000 during any 12 consecutive month period prior to 18
                  months after execution of such contract."

         5.13 Article 10 of the Existing Note Purchase Agreement is hereby
amended by adding the following new Section 10.16:

                  "Section 10.16. Additional Indebtedness. Prior to June 30,
         2004 or any refinancing of the Bank Credit Agreement existing on the
         date of Amendment No. 1, the Company and its Subsidiaries shall not
         incur, assume or suffer to exist any Debt (including, without
         limitation, any Guaranty), except Debt permitted by Section 6.14 of the
         Bank Credit Agreement as in effect on the Effective Date.

         5.14 Schedule B of the Existing Note Purchase Agreement is hereby
amended by deleting the definitions of "Enron Subordinated Debt", "Interest
Charges Coverage Ratio" and "Management Fees" set forth therein, and adding the
following definitions in their appropriate alphabetical order as follows:

                  "ACQUISITION" means a direct or indirect purchase by the
         Company or any of its Subsidiaries for cash, stock or other securities
         or property, whether in one or more related transactions, of all or
         substantially all of the assets, or more than 50% of voting securities
         or other equity interests, of a Person or a division, group or other
         business unit of a Person. Mergers and consolidations among any one or
         more of the Company and its Subsidiaries permitted by Section 10.6 of
         this Agreement shall not be considered an Acquisition."

                  "AMENDMENT NO. 1" means that certain Amendment No. 1 to this
         Note Purchase Agreement, dated as of August 12, 2002."

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       11
<PAGE>

                  "APPLICABLE MARGIN" means, during any fiscal quarter with
         respect to which the Company's ratio of Funded Debt to EBITDA is (a)
         less than 2.00, .25%; (b) equal to or greater than 2.00 but less than
         or equal to 2.50, .50%; (c) more than 2.50 and equal to or less than
         3.00, .75%, (d) more than 3.00 and equal to or less than 3.50, 1.00%,
         and (e) greater than 3.50, 1.50%; provided, however, that the
         Applicable Margin for the period commencing on the Effective Date and
         ending September 30, 2002 shall be 1.50%. If at June 30, 2004 or any
         time thereafter, the ratio measured by Section 10.2 has been 2.5 or
         less for four consecutive quarters, the Applicable Margin shall at all
         times thereafter be zero percent (0%)".

                  "BASE RATE" means, the Series A-1 Base Rate, Series A-2 Base
         Rate, Series A-3 Base Rate, Series B-1 Base Rate, Series B-2 Base Rate
         or the Series B-3 Base Rate, as applicable."

                  "CAPITAL EXPENDITURES" means, for any period, the sum, without
         duplication, of all expenditures of the Company and its Subsidiaries
         for fixed or capital assets made during such period which, in
         accordance with GAAP, are required to be classified as capital
         expenditures, in each case excluding all such expenditures incurred by
         any entity or business acquired in an Acquisition prior to the date of
         such Acquisition."

                  "COMMITMENT AMOUNT" has the meaning ascribed to such term in
         the Bank Credit Agreement.

                  "CONSOLIDATED INTEREST EXPENSE" means, for any period, total
         interest expense of the Company and its Subsidiaries on a consolidated
         basis for such period in connection with Debt (including, without
         limitation, Make-Whole Amount or Modified Make-Whole Amount, as
         applicable, paid in connection with the prepayment of the Notes),
         determined in accordance with GAAP.

                  "CONSOLIDATED NET ACCOUNTS" means, as of any date of
         determination, accounts receivable set out in the consolidated balance
         sheet of the Company and its Subsidiaries as accounts receivable, net
         of allowances, and in each case, as determined in accordance with
         GAAP."

                  "CONSOLIDATED NET ASSETS" means, as of any date of
         determination, the sum of (a) Consolidated Net Accounts, plus (b)
         Consolidated Net PP&E."

                  "CONSOLIDATED NET PP&E" means, as of any date of
         determination, the difference of (a) total property, plant and
         equipment of the Company and its Subsidiaries set out in the
         consolidated balance sheet of the Company and its Subsidiaries, minus
         (b) accumulated depreciation expense attributed to such items, set out
         in the consolidated balance sheet of the Company and its Subsidiaries
         as "property and equipment, net", and in each case, as determined in
         accordance with GAAP."

                  "CONSOLIDATED NET WORTH" means the consolidated stockholder's
         equity of the Company and its Subsidiaries, as determined in accordance
         with GAAP.

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       12
<PAGE>

                  "EBIT" means, for any period, on a trailing four fiscal
         quarter basis, the sum of Consolidated Net Income plus, without
         duplication, each of the following to the extent actually deducted in
         determining Consolidated Net Income: (a) Consolidated Interest Expense;
         (b) provisions for taxes based on income or revenues; (c) provisions
         made in accordance with FAS 142 which, together with all other charges
         theretofore taken in connection with FAS 142, do not exceed
         $800,000,000 in the aggregate; (d) to the extent applicable, Permitted
         Charges; and (e) non-cash charges related to the Company's stock option
         program or stock compensation plan as required to be taken pursuant to
         GAAP, in each case calculated on a consolidated basis for the Company
         and its Subsidiaries and as determined in accordance with GAAP."

                  "EBITDA" means, for any period, on a trailing four fiscal
         quarter basis (using the historical financial results of any business
         acquired in an Acquisition through the Effective Date, to the extent
         applicable, all on a pro forma basis, consistent with SEC regulations),
         the sum of Consolidated Net Income plus, without duplication, each of
         the following to the extent actually deducted in determining
         Consolidated Net Income: (a) Consolidated Interest Expense; (b)
         provisions for taxes based on income or revenues; (c) the amount of all
         depreciation and amortization expense deducted in determining
         Consolidated Net Income; (d) charges taken in accordance with FAS 142
         which, together with all other charges theretofore taken in connection
         with FAS 142, do not exceed $800 million in the aggregate; (e) without
         duplication, Permitted Charges; and (f) without duplication, Non-Cash
         Charges, all calculated on a consolidated basis for the Company and its
         Subsidiaries and as determined in accordance with GAAP. Upon the
         consummation of any Acquisition after the Effective Date, EBITDA may be
         calculated, subject to the immediately following sentence, using a
         calculation which (y) includes the historical financial results of the
         acquired business on a pro forma trailing four fiscal quarter basis
         (consistent with SEC regulations), and (z) assumes that the
         consummation of such Acquisition (and the incurrence, refinancing, or
         assumption of any Debt in connection with such Acquisition) occurred on
         the first day of the trailing four fiscal quarter period. The foregoing
         adjustment to EBITDA to take into account an Acquisition may only be
         made if the balance sheet and statements of income, retained earnings,
         and cash flows of the acquired Person (or the Person from whom the
         assets, securities or other equity interests were acquired), are in
         compliance with SEC regulations and requirements regarding the
         preparation and presentation of historical financial information and
         pro forma financial information."

                  "FAS 142" means SFAS No. 142 "Goodwill and other Intangible
         Assets" promulgated by the Financial Accounting Standards Board in July
         2001.

                  "FUNDED DEBT" means, as of any date of determination, the sum,
         without duplication, of the following for the Company and its
         Subsidiaries: (i) Debt for borrowed money, all obligations evidenced by
         bonds, debentures, notes or similar instruments, and purchase money
         obligations which in accordance with GAAP would be shown on the
         consolidated balance sheet of the Company as a liability, (ii) all LC
         Obligations (as such term is defined in the Bank Credit Agreement), and
         all reimbursement obligations relative to the face amount of all other
         letters of credit issued for the account of the Company or any of its
         Subsidiaries, and (iii) all Capital Lease Obligations.

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       13
<PAGE>

                  "INTEREST RATE PROTECTION AGREEMENT" means any hedge, swap,
         exchange, forward, future collar or cap arrangements, fixed price
         agreements or other agreements or arrangements designed to protect
         against fluctuations in interest rates.

                  "MINIMUM ASSET COVERAGE RATIO" means, when determined, the
         ratio of (a) Consolidated Net Assets, to (b) Senior Debt."

                  "MINIMUM INTEREST COVERAGE RATIO" means, for any period, on a
         trailing four fiscal quarter basis, the ratio of (a) EBIT, to (b) the
         sum of Consolidated Interest Expense (excluding any Make-Whole Amount
         or Modified Make-Whole Amount, as applicable, paid in connection with
         asset sales which result in a mandatory prepayment on the Senior
         Notes), plus the amount of any dividend or distribution recognized in
         respect of the Preferred Stock during such period."

                  "MODIFIED MAKE-WHOLE AMOUNT" means, at any time, the
         Make-Whole Amount computed as if interest on each Note will accrue, at
         all times, at the Base Rate applicable to such Note, regardless of
         whether such Base Rate is the rate of interest currently in effect for
         such Note."

                  "NON-CASH CHARGES" means, for any period, the amount of
         non-cash charges during such period properly taken in accordance with
         GAAP; provided that, if any cash outlay is made during such period in
         respect of such non-cash charge, only the amount of such non-cash
         charge which exceeds the amount of the cash outlay may be added back to
         Consolidated Net Income for purposes of calculating EBITDA."

                  "PERMITTED CHARGES" means, for any period, on a trailing four
         fiscal quarter basis, expenses, write-offs or losses, which in each
         case have been (a) paid, incurred or realized on or before June 30,
         2003, (b) disclosed to the Required Holders in such detail as the
         Required Holders deem acceptable, and (c) determined in accordance with
         GAAP, and which relate to:

                           (a) employee terminations, equipment sales, operating
                  lease termination expenses, and real estate lease terminations
                  (including related clean-up and moving charges) which, in the
                  aggregate do not exceed $29,000,000, provided that, cash
                  payments in connection with the items under this clause (a),
                  may not, in the aggregate, exceed $20,000,000,

                           (b) accounts receivable, notes receivable, retainage,
                  costs and earnings in excess of billing, and other amounts
                  which (i) are either (A) set out in the consolidated balance
                  sheet of the Company and its Subsidiaries for the fiscal
                  quarter ended June 30, 2002 as net of allowances or (B)
                  disclosed in writing to the Required Holders on August 12,
                  2002 or (ii) relate to the contractual obligations of Company
                  or its Subsidiaries existing on June 30, 2002 as disclosed in
                  writing to the Required Holders on August 12, 2002, and which
                  have been charged off as doubtful for collection, provided
                  that, such amounts may not, in the aggregate, exceed
                  $62,000,000,

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       14
<PAGE>

                           (c) the proxy contest with Utilicorp, and which do
                  not, in the aggregate, exceed $13,000,000, and

                           (d) advisory, legal, and bank fees and expenses in
                  connection with the negotiation, execution and delivery of the
                  Eighth Amendment to the Bank Credit Agreement and Amendment
                  No. 1, and related third party due diligence conducted in
                  connection therewith, and which do not, in the aggregate,
                  exceed $3,500,000, and (ii) non-cash expenses related to prior
                  financing transaction costs and expenses which have been
                  capitalized and are required to be expensed in accordance with
                  GAAP."

                  "RESTRICTED PAYMENT" means, in respect of any corporation,
         association or other business entity:

                           (a) dividends or other distributions or payments on
                  capital stock or other equity interest of such corporation,
                  association or other business entity (except distributions in
                  such stock or other equity interest); and

                           (b) the redemption or acquisition of such stock or
                  other equity interests or of warrants, rights or other options
                  to purchase such stock or other equity interests (except when
                  solely in exchange for such stock or other equity interests)
                  unless made, contemporaneously, from the net proceeds of a
                  sale of such stock or other equity interests.

                  "SERIES A-1 BASE RATE" means 8.46%.

                  "SERIES A-1 INTEREST RATE" means, with respect to any fiscal
         quarter of the Company, the Series A-1 Base Rate, plus the Applicable
         Margin with respect to the immediately preceding fiscal quarter.

                  "SERIES A-2 BASE RATE" means 8.55%.

                  "SERIES A-2 INTEREST RATE" means, with respect to any fiscal
         quarter of the Company, the Series A-2 Base Rate, plus the Applicable
         Margin with respect to the immediately preceding fiscal quarter.

                  "SERIES A-3 BASE RATE" means 8.61%.

                  "SERIES A-3 INTEREST RATE" means, with respect to any fiscal
         quarter of the Company, the Series A-3 Base Rate, plus the Applicable
         Margin with respect to the immediately preceding fiscal quarter.

                  "SERIES B-1 BASE RATE" means 8.01%.

                  "SERIES B-1 INTEREST RATE" means, with respect to any fiscal
         quarter of the Company, the Series B-1 Base Rate, plus the Applicable
         Margin with respect to the immediately preceding fiscal quarter.

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       15
<PAGE>

                  "SERIES B-2 BASE RATE" means 8.06%.

                  "SERIES B-2 INTEREST RATE" means, with respect to any fiscal
         quarter of the Company, the Series B-2 Base Rate, plus the Applicable
         Margin with respect to the immediately preceding fiscal quarter.

                  "SERIES B-3 BASE RATE" means 8.29%.

                  "SERIES B-3 INTEREST RATE" means, with respect to any fiscal
         quarter of the Company, the Series B-3 Base Rate, plus the Applicable
         Margin with respect to the immediately preceding fiscal quarter.

                  "UTILICORP" means Aquila, Inc., a Delaware corporation (f/k/a
         UtiliCorp United Inc.)."

         5.15 The Series A-1 Notes outstanding on the Effective Date of this
Amendment, without any further action required on the part of any other Person,
are deemed to be automatically amended to conform to, and to have the terms
provided in, Exhibit A-1 attached hereto. Existing Series A-1 Notes may, but
need not, be surrendered for replacement Notes in accordance with Section 13.2
of the Existing Note Purchase Agreement. Each Series A-1 Note issued on or after
the Effective Date of this Amendment shall be in the form of Exhibit A-1
attached hereto.

         5.16 The Series A-2 Notes outstanding on the Effective Date of this
Amendment, without any further action required on the part of any other Person,
are deemed to be automatically amended to conform to and have the terms provided
in Exhibit A-2 attached hereto. Existing Series A-2 Notes may, but need not, be
surrendered for replacement Notes in accordance with Section 13.2 of the
Existing Note Purchase Agreement. Each Series A-2 Note issued on or after the
Effective Date of this Amendment shall be in the form of Exhibit A-2 attached
hereto.

         5.17 The Series A-3 Notes outstanding on the Effective Date of this
Amendment, without any further action required on the part of any other Person,
are deemed to be automatically amended to conform to and have the terms provided
in Exhibit A-3 attached hereto. Existing Series A-3 Notes may, but need not, be
surrendered for replacement Notes in accordance with Section 13.2 of the
Existing Note Purchase Agreement. Each Series A-3 Note issued on or after the
Effective Date of this Amendment shall be in the form of Exhibit A-3 attached
hereto.

         5.18 The Series B-1 Notes outstanding on the Effective Date of this
Amendment, without any further action required on the part of any other Person,
are deemed to be automatically amended to conform to and have the terms provided
in Exhibit B-1 attached hereto. Existing Series B-1 Notes may, but need not, be
surrendered for replacement Notes in accordance with Section 13.2 of the
Existing Note Purchase Agreement. Each Series B-1 Note issued on or after the
Effective Date of this Amendment shall be in the form of Exhibit B-1 attached
hereto.

         5.19 The Series B-2 Notes outstanding on the Effective Date of this
Amendment, without any further action required on the part of any other Person,
are deemed to be automatically amended to conform to and have the terms provided
in Exhibit B-2 attached hereto. Existing Series B-2 Notes may,

                                       16
<PAGE>

but need not, be surrendered for replacement Notes in accordance with Section
13.2 of the Existing Note Purchase Agreement. Each Series B-2 Note issued on or
after the Effective Date of this Amendment shall be in the form of Exhibit B-2
attached hereto.

         5.20 The Series B-3 Notes outstanding on the Effective Date of this
Amendment, without any further action required on the part of any other Person,
are deemed to be automatically amended to conform to and have the terms provided
in Exhibit B-3 attached hereto. Existing Series B-3 Notes may, but need not, be
surrendered for replacement Notes in accordance with Section 13.2 of the
Existing Note Purchase Agreement. Each Series B-3 Note issued on or after the
Effective Date of this Amendment shall be in the form of Exhibit B-3 attached
hereto.

         5.21 Schedule 5.4 to the Existing Note Purchase Agreement is hereby
replaced with Schedule 5.4 hereto.

         5.22 Schedule 5.15 to the Existing Note Purchase Agreement is hereby
amended to read: "Debt reflected on the balance sheet of the Company as of June
30, 2002."

         5.23 For the purposes of calculating financial covenants in the
Existing Note Purchase Agreement, as amended by Amendment No. 1, for the fiscal
quarter ended June 30, 2002, the parties acknowledge and agree that the Company
may calculate such financial covenants utilizing the terms contained in
Amendment No. 1 and agree to permit retroactive application of such terms for
this limited purpose.

SECTION 6. EFFECT OF AMENDMENT.

         Except as expressly provided in this Amendment, the Existing Note
Purchase Agreement and the Notes shall remain in full force and effect, without
modification or amendment. This Amendment shall be binding upon, and shall inure
to the benefit of, the successors and assigns of the parties hereto and the
holders from time to time of the Notes.

SECTION 7. SURVIVAL.

         All warranties, representations, certifications and covenants made by
the Company in this Amendment or in any certificate or other instrument
delivered by the Company or on its behalf under this Amendment shall be
considered to have been relied upon by the Noteholders and shall survive the
execution of this Amendment, regardless of any investigation made by or on
behalf of any Noteholder. All statements in any such certificate or other
instrument in connection with this Amendment shall constitute warranties and
representations of the Company under this Amendment.

SECTION 8. DUPLICATE ORIGINALS; EXECUTION IN COUNTERPART.

         Two or more duplicate originals of this Amendment may be signed by the
parties, each of which shall be an original but all of which together shall
constitute one and the same instrument. This Amendment may be executed in one or
more counterparts and shall be effective when at least one counterpart shall
have been executed by the Company and the Required Holders (subject to Section 3
hereof) each as a party to this Amendment, and each set of counterparts which,
collectively, show execution by each such party to this Amendment shall
constitute one duplicate original.

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       17
<PAGE>

SECTION 9. GOVERNING LAW.

         THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED AND ENFORCED IN
ACCORDANCE WITH, NEW YORK LAW WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAWS.

      [REMAINDER OF PAGE INTENTIONALLY BLANK. NEXT PAGE IS SIGNATURE PAGE.]

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

                                       18
<PAGE>

         IN WITNESS WHEREOF, the Company and the Noteholders have executed this
Amendment as of the date first above written.

                                        QUANTA SERVICES, INC.

                                        By: /s/ James H. Haddox
                                            ----------------------------------
                                               Name: James H. Haddox
                                               Title: Chief Financial Officer

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT

<PAGE>

ACCEPTED AND AGREED TO:

MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY

By:      David L. Babson and Company
         Incorporated, as Investment Advisor

By:  /s/ Richard C. Morrison
     ---------------------------------
         Name: Richard C. Morrison
         Title: Managing Director

C.M. LIFE INSURANCE COMPANY

By:      David L. Babson and Company
         Incorporated, as Investment Advisor

By:  /s/ Richard C. Morrison
     ---------------------------------
         Name: Richard C. Morrison
         Title: Managing Director

UNITED OF OMAHA LIFE INSURANCE COMPANY

By:  /s/ Edwin H. Garrison Jr.
     ---------------------------------
         Name: Edwin H. Garrison Jr.
         Title: First Vice President

COMPANION LIFE INSURANCE COMPANY

By:  /s/ Edwin H. Garrison Jr.
     ---------------------------------
         Name: Edwin H. Garrison Jr.
         Title: Authorized Representative

NEW YORK LIFE INSURANCE AND ANNUITY CORPORATION

By:  New York Life Insurance Company

By:  /s/ A. Post Howland
     ---------------------------------
         Name: A. Post Howland
         Title: Vice President

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT
<PAGE>

MINNESOTA LIFE INSURANCE COMPANY

By:  Advantus Capital Management, Inc.

By:  /s/ Joseph Gogola
     ---------------------------------
         Name: Joseph Gogola
         Title: Vice President

AMERICAN FIDELITY ASSURANCE COMPANY

By:  Advantus Capital Management, Inc.

By:  /s/ James F. Geiger
     ---------------------------------
         Name: James F. Geiger
         Title: Vice President

MTL INSURANCE COMPANY

By:  Advantus Capital Management, Inc.

By:  /s/ David R. Hackney
     ---------------------------------
         Name: David R. Hackney
         Title: Vice President

UNITY MUTUAL LIFE INSURANCE COMPANY - ANNUITY PORTFOLIO

By:  Advantus Capital Management, Inc.

By:  /s/ David Land
     ---------------------------------
         Name: David Land
         Title: Vice President

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT
<PAGE>

PROTECTIVE LIFE INSURANCE COMPANY

By:  /s/ Stephen M. Liberatore
     -------------------------------------------
         Name: Stephen M. Liberatore
         Title: Vice President/Portfolio Manager

ALLSTATE LIFE INSURANCE COMPANY

By:  /s/ Bill Schmidt
     -------------------------------------------
         Name: Bill Schmidt
         Title: Authorized Signatory

By:  /s/ Ronald A. Mendel
     -------------------------------------------
         Name: Ronald A. Mendel
         Title: Authorized Signatory

AMERICAN HERITAGE LIFE INSURANCE COMPANY

By:  /s/ Bill Schmidt
     -------------------------------------------
         Name: Bill Schmidt
         Title: Authorized Signatory

By:  /s/ Ronald A. Mendel
     -------------------------------------------
         Name: Ronald A. Mendel
         Title: Authorized Signatory

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT
<PAGE>

THE TRAVELERS INSURANCE COMPANY, FOR ITSELF
AND TWO OF ITS SEPARATE ACCOUNTS

By:  /s/ Robert M. Mills
     ---------------------------------
         Name: Robert M. Mills
         Title: Investment Officer

SOUTHERN FARM BUREAU LIFE INSURANCE COMPANY

By:  /s/ Carol Robertson
     ---------------------------------
         Name: Carol Robertson, CPA
         Title: Portfolio Manager,
                Fixed Income

COLONIAL LIFE & ACCIDENT INSURANCE COMPANY

By:  Provident Investment Management, LLC, its Agent

By:  /s/ David Fussell
     ---------------------------------
         Name: David Fussell
         Title: Senior Vice President

UNUM LIFE INSURANCE COMPANY OF AMERICA

By:  Provident Investment Management, LLC, its Agent

By:  /s/ David Fussell
     ---------------------------------
         Name: David Fussell
         Title: Senior Vice President

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT
<PAGE>

THRIVENT FINANCIAL FOR LUTHERANS (FORMERLY AID ASSOCIATION FOR LUTHERANS AND
SUCCESSOR BY MERGER TO LUTHERAN BROTHERHOOD)

By:  /s/ Glen Vanic
     ---------------------------------
         Name: Glen Vanic
         Title: Portfolio Manager

PHOENIX LIFE INSURANCE COMPANY

By:  /s/ John H. Beers
     ---------------------------------
         Name: John H. Beers
         Title: Vice President

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

By:  /s/ Tad Anderson
     ---------------------------------
         Name: Tad Anderson
         Title: Manager Investments

By:  /s/ Mark Corbett
     ---------------------------------
         Name: Mark Corbett
         Title: Senior Vice President

MODERN WOODMEN OF AMERICA

By:  /s/ Nick Coin
     ---------------------------------
         Name: Nick Coin
         Title: Treasurer & Investment
                Manager

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT
<PAGE>

AMERICAN UNITED LIFE INSURANCE COMPANY

By:  /s/ Christopher D. Pahlke
     ---------------------------------
         Name: Christopher D. Pahlke
         Title: Vice President

PIONEER MUTUAL LIFE INSURANCE COMPANY

By Its Agent:  American United Life Insurance Company

By:  /s/ Christopher D. Pahlke
     ---------------------------------
         Name: Christopher D. Pahlke
         Title: Vice President Private Placements

THE STATE LIFE INSURANCE COMPANY

By Its Agent:  American United Life Insurance Company

By:  /s/ Christopher D. Pahlke
     ---------------------------------
         Name: Christopher D. Pahlke
         Title: Vice President Private Placements

THE GUARDIAN LIFE INSURANCE COMPANY OF AMERICA

By:  /s/ Ellen L. Whittaker
     ---------------------------------
         Name: Ellen L. Whittaker
         Title: Director

SECURITY FINANCIAL LIFE INSURANCE CO.

By:  /s/ Kevin W. Hammond
     ---------------------------------
         Name: Kevin W. Hammond
         Title: Vice President Chief
                Investment Officer

QUANTA SERVICES, INC.                 AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT
<PAGE>

                                     ANNEX 1

Massachusetts Mutual Life Insurance Company
1295 State Street
Springfield, MA 01111

C.M. Life Insurance Company
1295 State Street
Springfield, MA 01111

United of Omaha Life Insurance Company
Mutual of Omaha Plaza
Omaha, NE 68175

Companion Life Insurance Company
Mutual of Omaha Plaza
Omaha, NE 68175

Minnesota Life Insurance Company
400 Robert Street North
St. Paul, MN 55101

American Fidelity Assurance Company
400 Robert Street North
St. Paul, MN 55101

MTL Insurance Company
400 Robert Street North
St. Paul, MN 55101

Unity Mutual Life Insurance Company - Annuity Portfolio
400 Robert Street North
St. Paul, MN 55101

Protective Life Insurance Company
P.O. Box 2606
Birmingham, AL 35202

Allstate Life Insurance Company
3075 Sanders Road, STE G3A
Northbrook, IL  60062-7127

American Heritage Life Insurance Company
3075 Sanders Road, STE G3A
Northbrook, IL  60062-7127

Southern Farm Bureau Life Insurance Company
1401 Livingston Lane
Jackson, MS 39213

<PAGE>

The Travelers Insurance Company
242 Trumbull Street
P.O. Box 150449
Hartford, CT 06115-0419

The Travelers Insurance Company, for two of it's Separate Accounts
242 Trumbull Street
P.O. Box 150449
Hartford, CT 06115-0419

New York Life Insurance and Annuity Corporation
51 Madison Avenue
New York, NY 10010-1603

Thrivent Financial for Lutherans
625 Fourth Avenue South
Minneapolis, MN 55415-1624

Great-West Life & Annuity Insurance Company
8515 East Orchard Road, 3rd Floor, Tower 2
Englewood, CO 80111

Modern Woodmen of America
1701 First Avenue
Rock Island, IL 61201

The Guardian Life Insurance Company of America
700 South Street
Pittsfield, MA 01201

Colonial Life & Accident Insurance Company
One Fountain Square
Chattanooga, TN 37402

Unum Life Insurance Company of America
One Fountain Square
Chattanooga, TN 37402

Phoenix Life Insurance Company
56 Prospect Street
Hartford, CT 06115-0480

American United Life Insurance Company
One American Square
Indianapolis, IN 46206

Pioneer Mutual Life Insurance Company
One American Square
Indianapolis, IN 46206

<PAGE>

The State Life Insurance Company
One American Square
Indianapolis, IN 46206

Security Financial Life Insurance Co.
200 Centennial Mall North
Lincoln, NE 68508

<PAGE>

                                                                     EXHIBIT A-1

                            [FORM OF TRANCHE 1 NOTE]

                              QUANTA SERVICES, INC.

         SERIES 2000-A SENIOR SECURED NOTE, TRANCHE 1, DUE MARCH 1, 2005

No. [_____]                                                               [Date]
$[________]                                                  PPN [_____________]

         FOR VALUE RECEIVED, the undersigned, QUANTA SERVICES, INC. (herein
called the "Company"), a corporation organized and existing under the laws of
the State of Delaware, hereby promises to pay to [_____________________] or
registered assigns, the principal sum of [__________________] DOLLARS on March
1, 2005 with interest (computed on the basis of a 360-day year of twelve 30-day
months) (a) on the unpaid balance thereof at (i) the Series A-1 Base Rate for
the period beginning on the date from which interest has most recently paid
prior to [August 12, 2002] and ending on (but not including) August 12, 2002 and
(ii) the Series A-1 Interest Rate from [August 12, 2002], in each case, payable
quarterly in arrears, on the first day of each January, April, July and October,
and at maturity, until the principal hereof shall have become due and payable,
and (b) to the extent permitted by law on any overdue payment (including any
overdue prepayment) of principal, any overdue payment of interest and any
overdue payment of any Make-Whole Amount, payable quarterly as aforesaid (or, at
the option of the registered holder hereof, on demand), at a rate per annum from
time to time equal to the greater of (i) the Series A-1 Interest Rate plus 2% or
(ii) 2% over the rate of interest publicly announced by Bank of America, N.A.
from time to time in New York, New York as its "base" or "prime" rate, but in
any event not in excess of the highest rate allowed by applicable law. If at
June 30, 2004 or any time thereafter the consolidated debt ratio measured by
Section 10.2 of the Note Purchase Agreement referred to below has been 2.5 to
1.0 or less for four consecutive fiscal quarters, interest on this Note shall
become payable semiannually on the first (1st) day of January and July of each
year.

         Payments of principal of interest on and any Make-Whole Amount with
respect to this Note are to be made in lawful money of the United States of
America at the principal office of Bank of America, N.A. in New York, New York
or at such other place as the Company shall have designated by written notice to
the holder of this Note as provided in the Note Purchase Agreement referred to
below.

         This Note is one of a series of Senior Secured Notes (herein called the
"Notes") issued pursuant to the Note Purchase Agreement, dated as of March 1,
2000 (as from time to time amended, supplemented or modified, the "Note Purchase
Agreement"), between the Company and the respective Purchasers named therein and
is entitled to the benefits thereof. Terms used herein and not defined shall
have the meanings ascribed to them in the Note Purchase Agreement. Each holder
of this Note will be deemed, by its acceptance hereof, (i) to have agreed to the
confidentiality provisions set forth in Section 20 of the Note Purchase
Agreement and (ii) to have made the representation set forth in Section 6.2 of
the Note Purchase Agreement.

<PAGE>

         This Note is a registered Note and, as provided in the Note Purchase
Agreement, upon surrender of this Note for registration of transfer, duly
endorsed, or accompanied by a written instrument of transfer duly executed, by
the registered holder hereof or such holder's attorney duly authorized in
writing, a new Note for a like principal amount will be issued to, and
registered in the name of, the transferee. Prior to due presentment for
registration of transfer, the Company may treat the person in whose name this
Note is registered as the owner hereof for the purpose of receiving payment and
for all other purposes, and the Company will not be affected by any notice to
the contrary.

         The Company will make required prepayments of principal on the dates
and in the amounts specified in the Note Purchase Agreement. This Note is also
subject to optional and mandatory prepayment, in whole or from time to time in
part, at the times and on the terms specified in the Note Purchase Agreement,
but not otherwise.

         If an Event of Default, as defined in the Note Purchase Agreement,
occurs and is continuing, the principal of this Note may be declared or
otherwise become due and payable in the manner, at the price (including any
applicable Make-Whole Amount) and with the effect provided in the Note Purchase
Agreement.

         Pursuant to the Guaranty Agreement dated as of March 1, 2000, certain
subsidiaries of the Company have absolutely and unconditionally guaranteed
payment in full of the principal of, Make-Whole Amount if any, and interest on
this Note and the performance by the Company of all of its obligations contained
in the Note Purchase Agreement all as more fully set forth in said Guaranty
Agreement.

         THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, AND THE
RIGHTS OF THE ISSUER AND HOLDER HEREOF SHALL BE GOVERNED BY, THE LAW OF THE
STATE OF NEW YORK EXCLUDING CHOICE-OF-LAW PRINCIPLES OF THE LAW OF SUCH STATE
THAT WOULD REQUIRE THE APPLICATION OF THE LAWS OF A JURISDICTION OTHER THAN SUCH
STATE.

                                           QUANTA SERVICES, INC.

                                           By
                                              ----------------------------------
                                              Name:
                                                    ----------------------------
                                              Title:
                                                     ---------------------------

<PAGE>

                                                                     EXHIBIT A-2

                            [FORM OF TRANCHE 2 NOTE]

                              QUANTA SERVICES, INC.

         SERIES 2000-A SENIOR SECURED NOTE, TRANCHE 2, DUE MARCH 1, 2007

No. [_____]                                                               [Date]
$[________]                                                  PPN [_____________]

         FOR VALUE RECEIVED, the undersigned, QUANTA SERVICES, INC. (herein
called the "Company"), a corporation organized and existing under the laws of
the State of Delaware, hereby promises to pay to [_____________________] or
registered assigns, the principal sum of [__________________] DOLLARS on March
1, 2007 with interest (computed on the basis of a 360-day year of twelve 30-day
months) (a) on the unpaid balance thereof at (i) the Series A-2 Base Rate for
the period beginning on the date from which interest has most recently paid
prior to [August 12, 2002] and ending on (but not including) August 12, 2002 and
(ii) the Series A-2 Interest Rate from [August 12, 2002], in each case, payable
quarterly, in arrears, on the first day of each January, April, July and
October, and at maturity, until the principal hereof shall have become due and
payable, and (b) to the extent permitted by law on any overdue payment
(including any overdue prepayment) of principal, any overdue payment of interest
and any overdue payment of any Make-Whole Amount, payable quarterly as aforesaid
(or, at the option of the registered holder hereof, on demand), at a rate per
annum from time to time equal to the greater of (i) the Series A-2 Interest Rate
plus 2% or (ii) 2% over the rate of interest publicly announced by Bank of
America, N.A. from time to time in New York, New York as its "base" or "prime"
rate, but in any event not in excess of the highest allowed by applicable law.
If at June 30, 2004 or any time thereafter the consolidated debt ratio measured
by Section 10.2 of the Note Purchase Agreement referred to below has been 2.5 to
1.0 or less for four consecutive fiscal quarters, interest on this Note shall
become payable semiannually on the first (1st) day of January and July of each
year.

         Payments of principal of interest on and any Make-Whole Amount with
respect to this Note are to be made in lawful money of the United States of
America at the principal office of Bank of America, N.A. in New York, New York
or at such other place as the Company shall have designated by written notice to
the holder of this Note as provided in the Note Purchase Agreement referred to
below.

         This Note is one of a series of Senior Secured Notes (herein called the
"Notes") issued pursuant to the Note Purchase Agreement, dated as of March 1,
2000 (as from time to time amended, supplemented or modified, the "Note Purchase
Agreement"), between the Company and the respective Purchasers named therein and
is entitled to the benefits thereof. Terms used herein and not defined shall
have the meanings ascribed to them in the Note Purchase Agreement. Each holder
of this Note will be deemed, by its acceptance hereof, (i) to have agreed to the
confidentiality provisions set forth in Section 20 of the Note Purchase
Agreement and (ii) to have made the representation set forth in Section 6.2 of
the Note Purchase Agreement.

<PAGE>

         This Note is a registered Note and, as provided in the Note Purchase
Agreement, upon surrender of this Note for registration of transfer, duly
endorsed, or accompanied by a written instrument of transfer duly executed, by
the registered holder hereof or such holder's attorney duly authorized in
writing, a new Note for a like principal amount will be issued to, and
registered in the name of, the transferee. Prior to due presentment for
registration of transfer, the Company may treat the person in whose name this
Note is registered as the owner hereof for the purpose of receiving payment and
for all other purposes, and the Company will not be affected by any notice to
the contrary.

         The Company will make required prepayments of principal on the dates
and in the amounts specified in the Note Purchase Agreement. This Note is also
subject to optional and mandatory prepayment, in whole or from time to time in
part, at the times and on the terms specified in the Note Purchase Agreement,
but not otherwise.

         If an Event of Default, as defined in the Note Purchase Agreement,
occurs and is continuing, the principal of this Note may be declared or
otherwise become due and payable in the manner, at the price (including any
applicable Make-Whole Amount) and with the effect provided in the Note Purchase
Agreement.

         Pursuant to the Guaranty Agreement dated as of March 1, 2000, certain
subsidiaries of the Company have absolutely and unconditionally guaranteed
payment in full of the principal of, Make-Whole Amount if any, and interest on
this Note and the performance by the Company of all of its obligations contained
in the Note Purchase Agreement all as more fully set forth in said Guaranty
Agreement.

         THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, AND THE
RIGHTS OF THE ISSUER AND HOLDER HEREOF SHALL BE GOVERNED BY, THE LAW OF THE
STATE OF NEW YORK EXCLUDING CHOICE-OF-LAW PRINCIPLES OF THE LAW OF SUCH STATE
THAT WOULD REQUIRE THE APPLICATION OF THE LAWS OF A JURISDICTION OTHER THAN SUCH
STATE.

                                           QUANTA SERVICES, INC.

                                           By
                                              ----------------------------------
                                              Name:
                                                    ----------------------------
                                              Title:
                                                     ---------------------------

<PAGE>

                                                                     EXHIBIT A-3

                            [FORM OF TRANCHE 3 NOTE]

                              QUANTA SERVICES, INC.

         SERIES 2000-A SENIOR SECURED NOTE, TRANCHE 3, DUE MARCH 1, 2010

No. [_____]                                                               [Date]
$[________]                                                  PPN [_____________]

         FOR VALUE RECEIVED, the undersigned, QUANTA SERVICES, INC. (herein
called the "Company"), a corporation organized and existing under the laws of
the State of Delaware, hereby promises to pay to [_____________________] or
registered assigns, the principal sum of [__________________] DOLLARS on March
1, 2010 with interest (computed on the basis of a 360-day year of twelve 30-day
months) (a) on the unpaid balance thereof at (i) the Series A-3 Base Rate for
the period beginning on the date from which interest has most recently paid
prior to [August 12, 2002] and ending on (but not including) August 12, 2002 and
(ii) the Series A-3 Interest Rate from [August 12, 2002], in each case, payable
quarterly in arrears, on the first day of each January, April, July and October,
and at maturity, until the principal hereof shall have become due and payable,
and (b) to the extent permitted by law on any overdue payment (including any
overdue prepayment) of principal, any overdue payment of interest and any
overdue payment of any Make-Whole Amount, payable quarterly as aforesaid (or, at
the option of the registered holder hereof, on demand), at a rate per annum from
time to time equal to the greater of (i) the Series A-3 Interest Rate plus 2% or
(ii) 2% over the rate of interest publicly announced by Bank of America, N.A.
from time to time in New York, New York as its "base" or "prime" rate, but in
any event not in excess of the highest rate allowed by applicable law. If at
June 30, 2004 or any time thereafter the consolidated debt ratio measured by
Section 10.2 of the Note Purchase Agreement referred to below has been 2.5 to
1.0 or less for four consecutive fiscal quarters, interest on this Note shall
become payable semiannually on the first (1st) day of January and July of each
year.

         Payments of principal of interest on and any Make-Whole Amount with
respect to this Note are to be made in lawful money of the United States of
America at the principal office of Bank of America, N.A. in New York, New York
or at such other place as the Company shall have designated by written notice to
the holder of this Note as provided in the Note Purchase Agreement referred to
below.

         This Note is one of a series of Senior Secured Notes (herein called the
"Notes") issued pursuant to the Note Purchase Agreement, dated as of March 1,
2000 (as from time to time amended, supplemented or modified, the "Note Purchase
Agreement"), between the Company and the respective Purchasers named therein and
is entitled to the benefits thereof. Terms used herein and not defined shall
have the meanings ascribed to them in the Note Purchase Agreement. Each holder
of this Note will be deemed, by its acceptance hereof, (i) to have agreed to the
confidentiality provisions set forth in Section 20 of the Note Purchase
Agreement and (ii) to have made the representation set forth in Section 6.2 of
the Note Purchase Agreement.

<PAGE>

         This Note is a registered Note and, as provided in the Note Purchase
Agreement, upon surrender of this Note for registration of transfer, duly
endorsed, or accompanied by a written instrument of transfer duly executed, by
the registered holder hereof or such holder's attorney duly authorized in
writing, a new Note for a like principal amount will be issued to, and
registered in the name of, the transferee. Prior to due presentment for
registration of transfer, the Company may treat the person in whose name this
Note is registered as the owner hereof for the purpose of receiving payment and
for all other purposes, and the Company will not be affected by any notice to
the contrary.

         The Company will make required prepayments of principal on the dates
and in the amounts specified in the Note Purchase Agreement. This Note is also
subject to optional and mandatory prepayment, in whole or from time to time in
part, at the times and on the terms specified in the Note Purchase Agreement,
but not otherwise.

         If an Event of Default, as defined in the Note Purchase Agreement,
occurs and is continuing, the principal of this Note may be declared or
otherwise become due and payable in the manner, at the price (including any
applicable Make-Whole Amount) and with the effect provided in the Note Purchase
Agreement.

         Pursuant to the Guaranty Agreement dated as of March 1, 2000, certain
subsidiaries of the Company have absolutely and unconditionally guaranteed
payment in full of the principal of, Make-Whole Amount if any, and interest on
this Note and the performance by the Company of all of its obligations contained
in the Note Purchase Agreement all as more fully set forth in said Guaranty
Agreement.

         THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, AND THE
RIGHTS OF THE ISSUER AND HOLDER HEREOF SHALL BE GOVERNED BY, THE LAW OF THE
STATE OF NEW YORK EXCLUDING CHOICE-OF-LAW PRINCIPLES OF THE LAW OF SUCH STATE
THAT WOULD REQUIRE THE APPLICATION OF THE LAWS OF A JURISDICTION OTHER THAN SUCH
STATE.

                                           QUANTA SERVICES, INC.

                                           By
                                              ----------------------------------
                                              Name:
                                                    ----------------------------
                                              Title:
                                                     ---------------------------

<PAGE>

                                                                     EXHIBIT B-1

                    [FORM OF SERIES 2000-B, TRANCHE 1 NOTES]

                              QUANTA SERVICES, INC.

       SERIES 2000-B SENIOR SECURED NOTE, TRANCHE 1, DUE SEPTEMBER 1, 2005

No. [_____]                                                               [Date]
$[________]                                                  PPN [_____________]

         FOR VALUE RECEIVED, the undersigned, QUANTA SERVICES, INC. (herein
called the "Company"), a corporation organized and existing under the laws of
the State of Delaware, hereby promises to pay to [_____________________] or
registered assigns, the principal sum of [__________________] DOLLARS on
September 1, 2005 with interest (computed on the basis of a 360-day year of
twelve 30-day months) (a) on the unpaid balance thereof at (i) the Series B-1
Base Rate for the period beginning on the date from which interest has most
recently paid prior to [August 12, 2002] and ending on (but not including)
August 12, 2002 and (ii) the Series B-1 Interest Rate from [August 12, 2002], in
each case, payable quarterly in arrears, on the first day of each January,
April, July and October, and at maturity, until the principal hereof shall have
become due and payable, and (b) to the extent permitted by law on any overdue
payment (including any overdue prepayment) of principal, any overdue payment of
interest and any overdue payment of any Make-Whole Amount, payable quarterly as
aforesaid (or, at the option of the registered holder hereof, on demand), at a
rate per annum from time to time equal to the greater of (i) the Series B-1
Interest Rate plus 2% or (ii) 2% over the rate of interest publicly announced by
Bank of America, N.A. from time to time in New York, New York as its "base" or
"prime" rate, but in any event not in excess of the highest rate allowed by
applicable law. If at June 30, 2004 or any time thereafter the consolidated debt
ratio measured by Section 10.2 of the Note Purchase Agreement referred to below
has been 2.5 to 1.0 or less for four consecutive fiscal quarters, interest on
this Note shall become payable semiannually on the first (1st) day of January
and July of each year.

         Payments of principal of interest on and any Make-Whole Amount with
respect to this Note are to be made in lawful money of the United States of
America at the principal office of Bank of America, N.A. in New York, New York
or at such other place as the Company shall have designated by written notice to
the holder of this Note as provided in the Note Purchase Agreement referred to
below.

         This Note is one of a series of Senior Secured Notes (herein called the
"Notes") issued pursuant to the Note Purchase Agreement, dated as of March 1,
2000 (as from time to time amended, supplemented or modified, the "Note Purchase
Agreement"), between the Company, the Purchasers named therein and Additional
Purchases of Notes from time to time issued pursuant to any Supplement to the
Note Purchase Agreement. This Note and the holder hereof are entitled equally
and ratably with the holders of all other Notes of all series from time to time
outstanding under the Note Purchase Agreement to all the benefits provided for
thereby or referred to therein. Terms used herein and not defined shall have the
meanings ascribed to them in the Note Purchase Agreement. Each holder of this
Note will be deemed, by its acceptance hereof, (i) to have agreed to the
confidentiality provisions set forth in Section 20 of the Note

<PAGE>

Purchase Agreement and (ii) to have made the representation set forth in Section
6.2 of the Note Purchase Agreement, provided that such holder may (in reliance
upon information provided by the Company, which shall not be unreasonably
withheld) make a representation to the effect that the purchase by such holder
of any Note will not constitute a non-exempt prohibited transaction under
Section 406(a) of ERISA.

         This Note is registered with the Company and, as provided in the Note
Purchase Agreement, upon surrender of this Note for registration of transfer,
duly endorsed, or accompanied by a written instrument of transfer duly executed,
by the registered holder hereof or such holder's attorney duly authorized in
writing, a new Note of the same series for a like principal amount will be
issued to, and registered in the name of, the transferee. Prior to due
presentment for registration of transfer, the Company may treat the person in
whose name this Note is registered as the owner hereof for the purpose of
receiving payment and for all other purposes, and the Company will not be
affected by any notice tot he contrary.

         This Note is not subject to regularly scheduled prepayments of
principal. This Note is subject to optional and mandatory prepayment, in whole
or from time to time in part, at the times and on the terms specified in the
Note Purchase Agreement, but not otherwise.

         If an Event of Default, as defined in the Note Purchase Agreement,
occurs and is continuing, the principal of this Note may be declared or
otherwise become due and payable in the manner, at the price (including any
applicable Make-Whole Amount) and with the effect provided in the Note Purchase
Agreement.

         THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, AND THE
RIGHTS OF THE ISSUER AND HOLDER HEREOF SHALL BE GOVERNED BY, THE LAW OF THE
STATE OF NEW YORK EXCLUDING CHOICE-OF-LAW PRINCIPLES OF THE LAW OF SUCH STATE
THAT WOULD REQUIRE THE APPLICATION OF THE LAWS OF A JURISDICTION OTHER THAN SUCH
STATE.

                                           QUANTA SERVICES, INC.

                                           By
                                              ----------------------------------
                                              Name:
                                                    ----------------------------
                                              Title:
                                                     ---------------------------

<PAGE>

                                                                     EXHIBIT B-2

                    [FORM OF SERIES 2000-B, TRANCHE 2 NOTES]

                              QUANTA SERVICES, INC.

       SERIES 2000-B SENIOR SECURED NOTE, TRANCHE 2, DUE SEPTEMBER 1, 2006

No. [_____]                                                               [Date]
$[________]                                                  PPN [_____________]

         FOR VALUE RECEIVED, the undersigned, QUANTA SERVICES, INC. (herein
called the "Company"), a corporation organized and existing under the laws of
the State of Delaware, hereby promises to pay to [_____________________] or
registered assigns, the principal sum of [__________________] DOLLARS on
September 1, 2006 with interest (computed on the basis of a 360-day year of
twelve 30-day months) (a) on the unpaid balance thereof at (i) the Series B-2
Base Rate for the period beginning on the date from which interest has most
recently paid prior to [August 12, 2002] and ending on (but not including)
August 12, 2002 and (ii) the Series B-2 Interest Rate from [August 12, 2002], in
each case, payable quarterly in arrears, on the first day of each January,
April, July and October, and at maturity, until the principal hereof shall have
become due and payable, and (b) to the extent permitted by law on any overdue
payment (including any overdue prepayment) of principal, any overdue payment of
interest and any overdue payment of any Make-Whole Amount, payable quarterly as
aforesaid (or, at the option of the registered holder hereof, on demand), at a
rate per annum from time to time equal to the greater of (i) the Series B-2
Interest Rate plus 2% or (ii) 2% over the rate of interest publicly announced by
Bank of America, N.A. from time to time in New York, New York as its "base" or
"prime" rate, but in any event not in excess of the highest rate allowed by
applicable law. If at June 30, 2004 or any time thereafter the consolidated debt
ratio measured by Section 10.2 of the Note Purchase Agreement referred to below
has been 2.5 to 1.0 or less for four consecutive fiscal quarters, interest on
this Note shall become payable semiannually on the first (1st) day of January
and July of each year.

         Payments of principal of interest on and any Make-Whole Amount with
respect to this Note are to be made in lawful money of the United States of
America at the principal office of Bank of America, N.A. in New York, New York
or at such other place as the Company shall have designated by written notice to
the holder of this Note as provided in the Note Purchase Agreement referred to
below.

         This Note is one of a series of Senior Secured Notes (herein called the
"Notes") issued pursuant to the Note Purchase Agreement, dated as of March 1,
2000 (as from time to time amended, supplemented or modified, the "Note Purchase
Agreement"), between the Company, the Purchasers named therein and Additional
Purchases of Notes from time to time issued pursuant to any Supplement to the
Note Purchase Agreement. This Note and the holder hereof are entitled equally
and ratably with the holders of all other Notes of all series from time to time
outstanding under the Note Purchase Agreement to all the benefits provided for
thereby or referred to therein. Terms used herein and not defined shall have the
meanings ascribed to them in the Note Purchase Agreement. Each holder of this
Note will be deemed, by its acceptance

<PAGE>

hereof, (i) to have agreed to the confidentiality provisions set forth in
Section 20 of the Note Purchase Agreement and (ii) to have made the
representation set forth in Section 6.2 of the Note Purchase Agreement, provided
that such holder may (in reliance upon information provided by the Company,
which shall not be unreasonably withheld) make a representation to the effect
that the purchase by such holder of any Note will not constitute a non-exempt
prohibited transaction under Section 406(a) of ERISA.

         This Note is registered with the Company and, as provided in the Note
Purchase Agreement, upon surrender of this Note for registration of transfer,
duly endorsed, or accompanied by a written instrument of transfer duly executed,
by the registered holder hereof or such holder's attorney duly authorized in
writing, a new Note of the same series for a like principal amount will be
issued to, and registered in the name of, the transferee. Prior to due
presentment for registration of transfer, the Company may treat the person in
whose name this Note is registered as the owner hereof for the purpose of
receiving payment and for all other purposes, and the Company will not be
affected by any notice to the contrary.

         This Note is not subject to regularly scheduled prepayments of
principal. This Note is subject to optional and mandatory prepayment, in whole
or from time to time in part, at the times and on the terms specified in the
Note Purchase Agreement, but not otherwise.

         If an Event of Default, as defined in the Note Purchase Agreement,
occurs and is continuing, the principal of this Note may be declared or
otherwise become due and payable in the manner, at the price (including any
applicable Make-Whole Amount) and with the effect provided in the Note Purchase
Agreement.

         THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, AND THE
RIGHTS OF THE ISSUER AND HOLDER HEREOF SHALL BE GOVERNED BY, THE LAW OF THE
STATE OF NEW YORK EXCLUDING CHOICE-OF-LAW PRINCIPLES OF THE LAW OF SUCH STATE
THAT WOULD REQUIRE THE APPLICATION OF THE LAWS OF A JURISDICTION OTHER THAN SUCH
STATE.

                                           QUANTA SERVICES, INC.

                                           By
                                              ----------------------------------
                                              Name:
                                                    ----------------------------
                                              Title:
                                                     ---------------------------

<PAGE>

                                                                     EXHIBIT B-3

                    [FORM OF SERIES 2000-B, TRANCHE 3 NOTES]

                              QUANTA SERVICES, INC.

       SERIES 2000-B SENIOR SECURED NOTE, TRANCHE 3, DUE SEPTEMBER 1, 2010

No. [_____]                                                               [Date]
$[________]                                                  PPN [_____________]

         FOR VALUE RECEIVED, the undersigned, QUANTA SERVICES, INC. (herein
called the "Company"), a corporation organized and existing under the laws of
the State of Delaware, hereby promises to pay to [_____________________] or
registered assigns, the principal sum of [__________________] DOLLARS on
September 1, 2010 with interest (computed on the basis of a 360-day year of
twelve 30-day months) (a) on the unpaid balance thereof at (i) the Series B-3
Base Rate for the period beginning on the date from which interest has most
recently paid prior to [August 12, 2002] and ending on (but not including)
August 12, 2002 and (ii) the Series B-3 Interest Rate from [August 12, 2002], in
each case, payable quarterly in arrears, on the first day of each January,
April, July and October, and at maturity, until the principal hereof shall have
become due and payable, and (b) to the extent permitted by law on any overdue
payment (including any overdue prepayment) of principal, any overdue payment of
interest and any overdue payment of any Make-Whole Amount, payable quarterly as
aforesaid (or, at the option of the registered holder hereof, on demand), at a
rate per annum from time to time equal to the greater of (i) the Series B-3
Interest Rate plus 2% or (ii) 2% over the rate of interest publicly announced by
Bank of America, N.A. from time to time in New York, New York as its "base" or
"prime" rate, but in any event not in excess of the highest rate allowed by
applicable law. If at June 30, 2004 or any time thereafter the consolidated debt
ratio measured by Section 10.2 of the Note Purchase Agreement referred to below
has been 2.5 to 1.0 or less for four consecutive fiscal quarters, interest on
this Note shall become payable semiannually on the first (1st) day of January
and July of each year.

         Payments of principal of interest on and any Make-Whole Amount with
respect to this Note are to be made in lawful money of the United States of
America at the principal office of Bank of America, N.A. in New York, New York
or at such other place as the Company shall have designated by written notice to
the holder of this Note as provided in the Note Purchase Agreement referred to
below.

         This Note is one of a series of Senior Secured Notes (herein called the
"Notes") issued pursuant to the Note Purchase Agreement, dated as of March 1,
2000 (as from time to time amended, supplemented or modified, the "Note Purchase
Agreement"), between the Company, the Purchasers named therein and Additional
Purchases of Notes from time to time issued pursuant to any Supplement to the
Note Purchase Agreement. This Note and the holder hereof are entitled equally
and ratably with the holders of all other Notes of all series from time to time
outstanding under the Note Purchase Agreement to all the benefits provided for
thereby or referred to therein. Terms used herein and not defined shall have the
meanings ascribed to them in the Note Purchase Agreement. Each holder of this
Note will be deemed, by its acceptance hereof, (i) to have agreed to the
confidentiality provisions set forth in Section 20 of the Note Purchase
Agreement

<PAGE>

and (ii) to have made the representation set forth in Section 6.2 of the Note
Purchase Agreement, provided that such holder may (in reliance upon information
provided by the Company, which shall not be unreasonably withheld) make a
representation to the effect that the purchase by such holder of any Note will
not constitute a non-exempt prohibited transaction under Section 406(a) of
ERISA.

         This Note is registered with the Company and, as provided in the Note
Purchase Agreement, upon surrender of this Note for registration of transfer,
duly endorsed, or accompanied by a written instrument of transfer duly executed,
by the registered holder hereof or such holder's attorney duly authorized in
writing, a new Note of the same series for a like principal amount will be
issued to, and registered in the name of, the transferee. Prior to due
presentment for registration of transfer, the Company may treat the person in
whose name this Note is registered as the owner hereof for the purpose of
receiving payment and for all other purposes, and the Company will not be
affected by any notice to the contrary.

         This Note is not subject to regularly scheduled prepayments of
principal. This Note is subject to optional and mandatory prepayment, in whole
or from time to time in part, at the times and on the terms specified in the
Note Purchase Agreement, but not otherwise.

         If an Event of Default, as defined in the Note Purchase Agreement,
occurs and is continuing, the principal of this Note may be declared or
otherwise become due and payable in the manner, at the price (including any
applicable Make-Whole Amount) and with the effect provided in the Note Purchase
Agreement.

         THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, AND THE
RIGHTS OF THE ISSUER AND HOLDER HEREOF SHALL BE GOVERNED BY, THE LAW OF THE
STATE OF NEW YORK EXCLUDING CHOICE-OF-LAW PRINCIPLES OF THE LAW OF SUCH STATE
THAT WOULD REQUIRE THE APPLICATION OF THE LAWS OF A JURISDICTION OTHER THAN SUCH
STATE.

                                           QUANTA SERVICES, INC.

                                           By
                                              ----------------------------------
                                              Name:
                                                    ----------------------------
                                              Title:
                                                     ---------------------------

<PAGE>

                                  SCHEDULE 5.4

<Table>
<Caption>
SUBSIDIARY                                           STATE OF INCORPORATION              STOCKHOLDER
----------                                           ----------------------              -----------
<S>                                                  <C>                                 <C>
Advanced Technologies and Installation Corporation   Washington                          Quanta Services, Inc.
Airlan Telecom Services, L.P.                        Texas
Allteck Line Contractors (USA), Inc.                 Washington                          Quanta Services, Inc.
Allteck Line Contractors, Inc.                       British Columbia
Arby Construction, Inc.                              Delaware                            Quanta Services, Inc.
Austin Trencher, Inc.                                Delaware                            Quanta Services, Inc.
Bradford Brothers, Inc.                              North Carolina                      Quanta Services, Inc.
Brown Engineering, LLC                               Delaware                            Spalj Construction Company
CCLC, Inc.                                           Delaware                            Conti Communications, Inc.
Coast to Coast, LLC                                  California                          Environmental Professional
                                                                                         Associates, Limited
Communication Manpower, Inc.                         Florida                             Trawick Construction Company, Inc.
Computapole, Inc.                                    Delaware                            Quanta Services, Inc.
Conti Communications, Inc.                           Delaware                            Quanta Services, Inc.
Croce Electric Company, Inc.                         Delaware                            Quanta Services, Inc.
Crown Fiber Communications, Inc.                     Virginia                            Quanta Services, Inc.
Digco Utility Construction, L.P.                     Delaware                            Mejia Personnel Services, Inc.
                                                                                         QDE LLC
Dillard Smith Construction Company                   Delaware                            Quanta Services, Inc.
Dot 05, LLC                                          Delaware                            Spalj Construction Company
Driftwood Electrical Contractors, Inc.               Delaware                            Quanta Services, Inc.
Environmental Professional Associates, Limited       California                          Quanta Services, Inc.
Five Points Construction Co.                         Texas                               Underground Construction Co., Inc.
GEM Engineering Co., Inc.                            Delaware                            Quanta Services, Inc.
Golden State Utility Co.                             Delaware                            Quanta Services, Inc.
H.L. Chapman Pipeline Construction, Inc.             Delaware                            Quanta Services, Inc.
Haines Construction Company                          Delaware                            Quanta Services, Inc.
Intermountain Electric, Inc.                         Colorado                            Quanta Services, Inc.
Irby Construction Company                            Mississippi                         Quanta Services, Inc.
Lake Norman Pipeline, LLC                            North Carolina                      Bradford Brother, Incorporated
Lindsey Electric, L.P.                               Delaware                            Mejia Personnel Services, Inc.
                                                                                         North Houston Pole Line, L.P.
Lineco Leasing, LLC                                  Washington                          Mustang Line Contractors, Inc.
Line Equipment Sales Co., Inc.                       South Carolina                      Sumter Utilities, Inc.
Logical Link, Inc.                                   Delaware                            Quanta Services, Inc.
Manuel Bros., Inc.                                   Delaware                            Quanta Services, Inc.
Mears Engineering, LLC                               Michigan                            Mears Group, Inc.
Mears Group, Inc.                                    Delaware                            Quanta Services, Inc.
Mears Services, LLC                                  Michigan                            Mears Group, Inc.
Mears/CPG, LLC                                       Michigan                            Mears Group, Inc.
Mears/HDD, LLC                                       Michigan                            Mears Group, Inc.
Mearsmex S. de R.L. de C.V.                          Mexico                              Mears Group, Inc.
                                                                                         Mears/HDD, LLC
Mejia Personnel Services, Inc.                       Texas                               Quanta Services, Inc.
Metro Underground Services, Inc.                     Illinois                            Quanta Services, Inc.
Mustang Line Contractors, Inc.                       Washington                          Quanta Services, Inc.
Network Communication Services, Inc.                 Delaware                            Quanta Services, Inc.
</Table>

<PAGE>

<Table>
<Caption>
SUBSIDIARY                                           STATE OF INCORPORATION              STOCKHOLDER
----------                                           ----------------------              -----------
<S>                                                  <C>                                 <C>
Network Electric Company                             Delaware                            Quanta Services, Inc.
North Houston Pole Line, L.P.                        Texas                               Mejia Personnel Services, Inc.
                                                                                         QDE LLC
North Pacific Construction Co., Inc.                 Delaware                            Quanta Services, Inc.
North Sky Communications, Inc.                       Delaware                            Quanta Services, Inc.
Northern Line Layers, Inc.                           Delaware                            Quanta Services, Inc.
Okay Construction Company, LLC                       Delaware                            Spalj Construction Company
P.D.G. Electric Company                              Florida                             Quanta Services, Inc.
Pac West Construction, Inc.                          Delaware                            Quanta Services, Inc.
PAR Electrical Contractors, Inc.                     Missouri                            Quanta Services, Inc.
Parkside Site & Utility Company Corporation          Delaware                            Quanta Services, Inc.
Parkside Utility Construction Corp.                  Delaware                            Quanta Services, Inc.
Potelco, Inc.                                        Washington                          Quanta Services, Inc.
Professional Teleconcepts, Inc.                      Illinois                            Quanta Services, Inc.
Professional Teleconcepts, Inc.                      New York                            Quanta Services, Inc.
PWR Financial Company                                Delaware                            Quanta Services, Inc.
PWR Network, LLC                                     Delaware                            PWR Financial Company
Q Resources, LLC                                     Delaware                            Quanta Holdings, Inc.
QDE LLC                                              Delaware                            PWR Financial Company
QPC, Inc.                                            Delaware                            Quanta Services, Inc.
QSI, Inc.                                            Delaware                            Quanta Holdings, Inc.
Quanta Asset Management LLC                          Delaware                            QSI, Inc.
Quanta Associates, L.P.                              Delaware                            Quanta Asset Management LLC
                                                                                         QSI, Inc.
Quanta Delaware, Inc.                                Delaware                            Quanta Holdings, Inc.
Quanta Holdings, Inc.                                Delaware                            Quanta Services, Inc.
Quanta LI Acquisition, Inc.                          Delaware                            Quanta Services, Inc.
Quanta LIV Acquisition, Inc.                         Delaware                            Quanta Services, Inc.
Quanta LIX Acquisition, Inc.                         Delaware                            Quanta Services, Inc.
Quanta LVII Acquisition, Inc.                        Delaware                            Quanta Services, Inc.
Quanta LVIII Acquisition, Inc.                       Delaware                            Quanta Services, Inc.
Quanta LX Acquisition, Inc.                          Delaware                            Quanta Services, Inc.
Quanta LXI Acquisition, Inc.                         Delaware                            Quanta Services, Inc.
Quanta LXII Acquisition, Inc.                        Delaware                            Quanta Services, Inc.
Quanta LXIII Acquisition, Inc.                       Delaware                            Quanta Services, Inc.
Quanta LXIV Acquisition, Inc.                        Delaware                            Quanta Services, Inc.
Quanta LXIX Acquisition, Inc.                        Delaware                            Quanta Services, Inc.
Quanta LXV Acquisition, Inc.                         Delaware                            Quanta Services, Inc.
Quanta LXVI Acquisition, Inc.                        Delaware                            Quanta Services, Inc.
Quanta LXVII Acquisition, Inc.                       Delaware                            Quanta Services, Inc.
Quanta LXVIII Acquisition, Inc.                      Delaware                            Quanta Services, Inc.
Quanta LXX Acquisition, Inc.                         Delaware                            Quanta Services, Inc.
Quanta LXXI Acquisition, Inc.                        Delaware                            Quanta Services, Inc.
Quanta LXXII Acquisition, Inc.                       Delaware                            Quanta Services, Inc.
Quanta LXXIII Acquisition, Inc.                      Delaware                            Quanta Services, Inc.
Quanta XXXI Acquisition, Inc.                        Delaware                            Quanta Services, Inc.
Quanta Receivables, L.P.                             Delaware                            QDE LLC
                                                                                         PWR Network, LLC
Quanta Services of Canada Ltd.                       British Columbia                    Quanta Services, Inc.
Quanta Services Management Partnership, L.P.         Texas                               Quanta Delaware, Inc.
                                                                                         QSI, Inc.
Quanta Utility Installation Company, Inc.            Delaware                            Quanta Services, Inc.
</Table>

<PAGE>

<Table>
<Caption>
SUBSIDIARY                                           STATE OF INCORPORATION              STOCKHOLDER
----------                                           ----------------------              -----------
<S>                                                  <C>                                 <C>
R.A. Waffensmith & Co., Inc.                         Delaware                            Quanta Services, Inc.
Ranger Field Services, Inc.                          Delaware                            Quanta Services, Inc.
S.K.S. Pipeliners, LLC                               Delaware                            Arby Construction, Inc.
Southeast Pipeline Construction, Inc.                Delaware                            Quanta Services, Inc.
Southwestern Communications, Inc.                    Delaware                            Quanta Services, Inc.
Southwest Trenching Company, Inc.                    Texas                               Quanta Services, Inc.
Spalj Construction Company                           Delaware                            Quanta Services, Inc.
Specialty Drilling Technology, Inc.                  Delaware                            Quanta Services, Inc.
Sumter Utilities, Inc.                               Delaware                            Quanta Services, Inc.
The Ryan Company, Inc.                               Massachusetts                       Quanta Services, Inc.
Tjader, L.L.C.                                       Delaware                            Spalj Construction Company
TNS-VA, LLC                                          Delaware                            Professional Teleconcepts, Inc.
Tom Allen Construction Company                       Delaware                            Quanta Services, Inc.
Trans Tech Acquisition, Inc.                         Texas                               Quanta Services, Inc.
Trans Tech Electric, L.P.                            Texas                               TTLP, Inc.
                                                                                         TTGP, Inc.
Trawick Construction Company, Inc.                   Florida                             Quanta Services, Inc.
TTGP, Inc.                                           Delaware                            Quanta Services, Inc.
TTLP, Inc.                                           Delaware                            Quanta Services, Inc.
TTM, Inc.                                            North Carolina                      Quanta Services, Inc.
TXLP, Inc.                                           Delaware                            Quanta Services, Inc.
Underground Construction Co., Inc.                   Delaware                            Quanta Services, Inc.
Utilco, Inc.                                         Georgia                             Quanta Services, Inc.
VCI Telcom, Inc.                                     Delaware                            Quanta Services, Inc.
W. C. Communications, Inc.                           Delaware                            Quanta Services, Inc.
W.H.O.M. Corporation                                 California                          Quanta Services, Inc.
</Table>

         The Company's directors are James R. Ball, John R. Colson, Terrence P.
Dunn, Vincent D. Foster, Louis C. Golm, Robert K. Green, Keith G. Stamm, Gary A.
Tucci, and John R. Wilson.

         The Company's executive officers are John R. Colson, Peter Dameris,
Dana A. Gordon, Nick Grindstaff, Frederick M. Haag, James H. Haddox, Derrick A.
Jensen, James F. O'Neil, III, Elliott C. Robbins, Gary W. Smith, Luke T. Spalj
and John R. Wilson.

<PAGE>

                                                                    ATTACHMENT A

                              QUANTA SERVICES, INC.

                              OFFICERS' CERTIFICATE

         We, [__________] and [_________], hereby certify that we are the duly
elected, qualified and acting [President/Vice President] and
[Secretary/Assistant Secretary] of QUANTA SERVICES, INC., a Delaware corporation
(the "COMPANY"), and that, as such, we have access to its records and are
familiar with the matters herein certified, and we are authorized to execute and
deliver this certificate in the name and on behalf of the Company, and further
certify as follows.

         1. This certificate is being delivered pursuant to Section 3(g) of
Amendment No. 1 to Note Purchase Agreement (the "AMENDMENT"), dated as of August
12, 2002, entered into by the Company and each of the purchasers listed on the
signature pages thereto (together with any affiliates thereof, the
"NOTEHOLDERS"). The terms used in this certificate and not defined herein have
the respective meanings specified in the Amendment.

         2. Attached hereto as Attachment A is a true and correct copy of
resolutions adopted by the Board of Directors of the Company, and such
resolutions set forth in Attachment A hereto were duly adopted by said Board of
Directors and are in full force and effect on and as of the date hereof, not
having been amended, altered or repealed, and such resolutions are filed with
the records of the Board of Directors.

         3. The documents listed below were executed and delivered by the
Company pursuant to and in accordance with the resolutions set forth in
Attachment A hereto:

                  (i)      Amendment No. 1 to Note Purchase Agreement.

         4. Attached hereto as Attachment B is a true, correct and complete copy
of the Articles of Incorporation and By-laws of the Company as in full force and
effect on and as of the date hereof without modification or amendment in any
respect.

         5. Each of the officers of the Company listed on Attachment C has been
a duly elected, qualified and acting officer of the Company holding the office
or offices set forth below opposite his or her name and the signature appearing
opposite the name of each such person on Attachment C is his or her genuine
signature.

         6. Attached hereto as Attachment D is a good standing certificate in
respect of the Company from the State of Delaware.

IN WITNESS THEREOF, We have hereunto set our hands on August 12 2002.

                                              QUANTA SERVICES, INC.

                                              By:
                                                  ------------------------------
                                              Name:
                                              Title:

                                              By:
                                                  ------------------------------
                                              Name:
                                              Title:

<PAGE>

                                  ATTACHMENT A

                               BOARD OF DIRECTORS
                              QUANTA SERVICES, INC.
                               RESOLUTIONS ADOPTED

<PAGE>

                                  ATTACHMENT B

               ARTICLES OF INCORPORATION AND BYLAWS OF THE COMPANY

<PAGE>

                                  ATTACHMENT C

               SPECIMEN SIGNATURES OF OFFICERS EXECUTING DOCUMENTS

<Table>
<Caption>
NAME                   TITLE(s)                           SIGNATURE
----                   --------                           ---------
<S>                    <C>                        <C>

----------             ----------                 ------------------------

----------             ----------
                                                  ------------------------

----------             ----------
                                                  ------------------------
</Table>

<PAGE>

                                  ATTACHMENT D

                    GOOD STANDING CERTIFICATE OF THE COMPANY

<PAGE>

                                                                    ATTACHMENT B

                              CONSENT OF GUARANTORS

         The undersigned Guarantors, as party to the Guaranty Agreement dated as
of March 1, 2000, hereby consent to the foregoing Amendment dated as of even
date herewith, to which this consent is attached, and confirm that the Guaranty
Agreement remains in full force and effect after giving effect thereto and
represent and warrant that there is no defense, counterclaim or offset of any
type or nature under the Guaranty Agreement.

Dated as of August 12, 2002

                                  GUARANTORS:

                                  ADVANCED TECHNOLOGIES AND INSTALLATION
                                     CORPORATION
                                  ALLTECK LINE CONTRACTORS (USA), INC.
                                  ARBY CONSTRUCTION, INC.
                                  AUSTIN TRENCHER, INC.
                                  BRADFORD BROTHERS, INC.
                                  CCLC, INC.
                                  COMMUNICATION MANPOWER, INC.
                                  COMPUTAPOLE, INC.
                                  CONTI COMMUNICATIONS, INC.
                                  CROCE ELECTRIC COMPANY, INC.
                                  CROWN FIBER COMMUNICATIONS, INC.
                                  DILLARD SMITH CONSTRUCTION COMPANY
                                  DRIFTWOOD ELECTRICAL CONTRACTORS, INC.
                                  ENVIRONMENTAL PROFESSIONAL ASSOCIATES, LIMITED
                                  FIVE POINTS CONSTRUCTION CO.
                                  GEM ENGINEERING CO., INC.
                                  GOLDEN STATE UTILITY CO.
                                  H.L. CHAPMAN PIPELINE CONSTRUCTION, INC.
                                  HAINES CONSTRUCTION COMPANY
                                  INTERMOUNTAIN ELECTRIC, INC.
                                  IRBY CONSTRUCTION COMPANY
                                  LINE EQUIPMENT SALES CO., INC.
                                  LOGICAL LINK, INC.
                                  MANUEL BROS., INC.
                                  MEARS GROUP, INC.
                                  MEJIA PERSONNEL SERVICES, INC.
                                  METRO UNDERGROUND SERVICES, INC.
                                  MUSTANG LINE CONTRACTORS, INC.
                                  NETWORK COMMUNICATION SERVICES, INC.
                                  NETWORK ELECTRIC COMPANY
                                  NORTH PACIFIC CONSTRUCTION CO., INC.
                                  NORTH SKY COMMUNICATIONS, INC.
                                  NORTHERN LINE LAYERS, INC.

<PAGE>

                                  PAC WEST CONSTRUCTION, INC.
                                  PAR ELECTRICAL CONTRACTORS, INC.
                                  PARKSIDE SITE & UTILITY COMPANY CORPORATION
                                  PARKSIDE UTILITY CONSTRUCTION CORP.
                                  P.D.G. ELECTRIC COMPANY
                                  POTELCO, INC.
                                  PROFESSIONAL TELECONCEPTS, INC. (IL)
                                  PROFESSIONAL TELECONCEPTS, INC. (NY)
                                  PWR FINANCIAL COMPANY
                                  QPC, INC.
                                  QSI, INC.
                                  QUANTA HOLDINGS, INC.
                                  QUANTA XXXI ACQUISITION, INC.
                                  QUANTA LI ACQUISITION, INC.
                                  QUANTA LIV ACQUISITION, INC.
                                  QUANTA LVII ACQUISITION, INC.
                                  QUANTA LVIII ACQUISITION, INC.
                                  QUANTA LIX ACQUISITION, 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.
                                  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 UTILITY INSTALLATION CO., INC.
                                  R.A. WAFFENSMITH & CO., INC.
                                  RANGER FIELD SERVICES, INC.
                                  SOUTHEAST PIPELINE CONSTRUCTION, INC.
                                  SOUTHWEST TRENCHING COMPANY, INC.
                                  SOUTHWESTERN COMMUNICATIONS, INC.
                                  SPALJ CONSTRUCTION COMPANY
                                  SPECIALTY DRILLING TECHNOLOGY, INC.
                                  SUMTER UTILITIES, INC.
                                  THE RYAN COMPANY, INC.
                                  TOM ALLEN CONSTRUCTION COMPANY
                                  TRANS TECH ACQUISITION, INC.
                                  TRAWICK CONSTRUCTION COMPANY, INC.
                                  TTGP, INC.
                                  TTLP. INC.
                                  TTM, INC.
                                  TXLP, INC.
                                  UNDERGROUND CONSTRUCTION CO., INC.

<PAGE>

                                  UTILCO, INC.
                                  VCI TELECOM, INC.
                                  W.C. COMMUNICATIONS, INC.
                                  W.H.O.M. CORPORATION

                                  By:
                                       -----------------------------------------
                                       Name:  Dana Gordon
                                       Title: President or Vice-President of
                                                each Guarantor

                                       QDE LLC
                                       QUANTA DELAWARE, INC.
                                       QUANTA ASSET MANAGEMENT LLC

                                       By:
                                            ------------------------------------
                                            Name:  Linda Bubacz
                                            Title: President

                                       BROWN ENGINEERING, LLC

                                       By:  Ranger Field Services, Inc., Its
                                              Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

                                       COAST TO COAST, LLC

                                       By:  Environmental Professional
                                              Associates, Limited, Its Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

                                       DOT  05, LLC
                                       TJADER, L.L.C.
                                       OKAY CONSTRUCTION COMPANY, LLC

                                       By:  Spalj Construction Company, Its
                                              Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

<PAGE>

                                       LAKE NORMAN PIPELINE, LLC

                                       By:  Bradford Brothers, Inc., Its Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

                                       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:  Dana Gordon
                                            Title: Vice President

                                       S.K.S. PIPELINERS, LLC

                                       By:  Arby Construction, Inc., Its Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

                                       TNS-VA, LLC

                                       By:  Professional Teleconcepts, Inc.
                                              (NY), Its Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

<PAGE>

                                       LINECO LEASING, LLC

                                       By:  Mustang Line Contractors, Inc., Its
                                              Sole Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

                                       AIRLAN TELECOM SERVICES, L.P.
                                       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:  Dana Gordon
                                            Title: Vice President

                                       QUANTA SERVICES MANAGEMENT PARTNERSHIP,
                                       L.P. QUANTA ASSOCIATES, L.P.

                                       By:  QSI, Inc., Its General Partner

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

                                       TRANS TECH ELECTRIC, L.P.

                                       By:  TTGP, Inc., Its General Partner

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

<PAGE>

                                       PWR NETWORK, LLC

                                       By:  PWR Financial Company, Its Sole
                                              Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

                                       Q RESOURCES, LLC

                                       By:  Quanta Holdings, Inc., Its Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

                                       QUANTA RECEIVABLES, L.P.

                                       By:  PWR Network, LLC, Its General
                                              Partner

                                            By:  PWR Financial Company, Its Sole
                                                   Member

                                       By:
                                            ------------------------------------
                                            Name:  Dana Gordon
                                            Title: Vice President

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