Document:

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                                                                   EXHIBIT 10.43

                               AMENDMENT NO. 2 TO
                       SETTLEMENT AND GOVERNANCE AGREEMENT

         This Amendment No. 2 to Settlement and Governance Agreement (this
"Amendment") dated and effective as of April 10, 2003 is entered into by and
between Quanta Services, Inc. ("Quanta") and Aquila, Inc. ("Aquila").

                                    RECITALS

         WHEREAS, Quanta and Aquila have entered into that certain Settlement
and Governance Agreement dated as of May 20, 2002, as amended, pursuant to which
the parties agreed, among other things, that the board of directors of Quanta
shall include an Independent Committee; and

         WHEREAS, Quanta and Aquila desire to amend the Settlement and
Governance Agreement (the "Agreement") in the manner set forth in this
Amendment.

         NOW, THEREFORE, the parties hereto hereby agrees as follows:

         1. Definitions. Capitalized terms used and not otherwise defined herein
have the meanings set forth in the Agreement.

         2. Amendment. Sections 2.03(a) and (b) of the Agreement are hereby
amended and restated in its entirety to read as follows:

                  (a) Outside Directors. Unless and until all of the outstanding
         Capital Stock of the Company is owned by Stockholder or Stockholder no
         longer holds any equity of the Company, there will at all times be at
         least three directors on the Board of Directors who are Independent
         ("Outside Directors") of both the Company and Stockholder. Stockholder
         shall perform its obligations under this Article II by voting its
         Shares, and directing the directors which it is entitled to nominate by
         virtue of owning the Series A Preferred Stock to act, accordingly.

                  (b) Independent Committee.

                  (i)   Unless and until all of the outstanding Capital Stock of
                        the Company is owned by Stockholder or Stockholder no
                        longer holds any equity of the Company, three of the
                        Outside Directors shall constitute a standing Committee
                        of Independent Directors (the "Independent Committee"),
                        which shall act by a majority vote of its members. The
                        members of the Independent Committee shall consist of an
                        Outside Director designated by the Stockholder, an
                        Outside Director designated by the chief executive
                        officer of the Company and a third Outside Director
                        designated by the two foregoing Outside Directors in
                        consultation with the chief

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                        executive officers of the Company and Stockholder. The
                        initial members of the Independent Committee shall be
                        Terrence P. Dunn, James R. Ball and a third Outside
                        Director mutually agreed by Messrs. Dunn and Ball,
                        after consultation with the chief executive officers of
                        the Company and Stockholder.

         3. Documents Otherwise Unchanged. Except as herein provided, the
Agreement shall remain unchanged and in full force and effect, and each
reference to the Agreement shall be a reference to the Agreement as amended
hereby and as the same may be further amended, restated, supplemented or
otherwise modified and in effect from time to time.

         4. Binding Effect. This Amendment shall be binding upon and inure to
the benefit of the party hereto and its successors and assigns.

         5. Governing Law. This Amendment shall be governed by and construed
under the laws of the State of Delaware (without regard to conflict of laws
principles), all rights and remedies being governed by said laws.

                            [signature page follows]

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         IN WITNESS WHEREOF, the undersigned have duly executed this Amendment
No. 2 to Settlement and Governance Agreement as of the date first written above.

                                 QUANTA SERVICES, INC.

                                 By: /s/ DANA A. GORDON
                                     --------------------------

                                 Name: Dana A. Gordon
                                 Title: Vice President

                                 AQUILA, INC.

                                 By: /s/ KEITH G. STAMM
                                     --------------------------
                                 Name: Keith G. Stamm
                                 Title: Chief Operating Officer<PAGE>

                                                                   EXHIBIT 10.44

                SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT

         This Second Amended and Restated Employment Agreement (the
"Agreement"), by and between Quanta Services, Inc., a Delaware corporation
("Employer"), and John R. Colson ("Employee"), is hereby entered into and
effective as of this 21st day of May 2003.

                                 R E C I T A L S

         A.       As of the date of this Agreement, Employer is engaged
primarily in the business of specialty electrical contracting for electric
utilities, telecommunications and cable television providers, and
transportation, commercial and industrial customers.

         B.       Employee is employed hereunder by Employer in a confidential
relationship wherein Employee, in the course of Employee's employment with
Employer, has and will continue to become familiar with and aware of non-public
information of Employer, including but not limited to, Employer's customers,
specific manner of doing business, including the processes, techniques and trade
secrets utilized by Employer, and future plans with respect thereto
("Confidential Information"), all of which has been and will be established and
maintained at great expense to Employer; this information is a trade secret and
constitutes the valuable goodwill of Employer.

         C.       Employer and Employee are parties to that certain Employment
Agreement effective as of February 12, 1998 (the "Original Agreement") and
Amended and Restated Employment Agreement dated March 8, 2000 (the "First
Amendment"), which the parties hereto desire to amend and restate in its
entirety.

                               A G R E E M E N T S

         In consideration of the mutual promises, terms, covenants and
conditions set forth herein and the performance of each, the parties hereto
hereby agree to amend and restate the Original Agreement and First Amendment as
follows:

         1.       Employment and Duties.

         (a)      Employer hereby employs Employee as Chief Executive Officer of
the Employer. As such, Employee shall have responsibilities, duties and
authority reasonably accorded to and expected of a Chief Executive Officer of
the Employer and will report directly to the Board of Directors of Employer (the
"Board"). Employee hereby accepts this employment upon the terms and conditions
herein contained and, subject to Paragraph 1(c) hereof, agrees to devote
Employee's time, attention and efforts to promote and further the business of
Employer.

         (b)      Employee shall faithfully adhere to, execute and fulfill all
reasonable policies established by the Board.

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         (c)      Employee shall not, during the term of his employment
hereunder, be engaged in any other business activity pursued for gain, profit or
other pecuniary advantage if such activity interferes with Employee's duties and
responsibilities hereunder. The foregoing limitations shall not be construed as
prohibiting Employee from making personal investments in such form or manner as
will neither require Employee's services in the operation or affairs of the
companies or enterprises in which such investments are made nor violate the
terms of Paragraph 4 hereof.

         (d)      Following termination of Employee's employment with Employer
for any reason, Employee shall immediately resign form any and all offices and
positions he holds with Employer or any subsidiary, or affiliated entity, of
Employer.

         2.       Compensation.

         For all services rendered by Employee, Employer shall compensate
Employee during Employee's period of employment hereunder as follows:

         (a)      Base Salary. The base salary payable to Employee shall be
$560,000.00 per year, payable on a regular basis in accordance with Employer's
standard payroll procedures but not less than monthly. On at least an annual
basis, the Board will review Employee's performance and may make increases to
such base salary if, in its discretion, any such increase is warranted. Such
recommended increase would, in all likelihood, require approval by the Board or
a duly constituted committee thereof.

         (b)      Incentive Bonus Plan. Employee shall participate in Employer's
Management Incentive Bonus Plan for the fiscal year ending December 31, 2003 at
a level commensurate with Employee's position, and subject to adjustment
periodically based on competitive practices of thepeer group used by Employer
for purposes of competitive compensation benchmarking. Employee will participate
in other current and future incentive bonus plans as determined by the Board or
a duly constituted committee thereof.

         (c)      Executive Perquisites, Benefits, and Other Compensation.
Employee shall be entitled to receive additional benefits and compensation from
Employer in such form and to such extent as specified below:

                  (i)      Payment of all premiums for coverage for Employee and
         Employee's dependent family members under health, hospitalization,
         disability, dental, life and other insurance plans that Employer may
         have in effect from time to time.

                  (ii)     Reimbursement for all business travel and other
         out-of-pocket expenses reasonably incurred by Employee in the
         performance of Employee's services pursuant to this Agreement. All
         reimbursable expenses shall be appropriately documented in reasonable
         detail by Employee upon submission of any request for reimbursement,
         and in a format and manner consistent with Employer's expense reporting
         policy.

                  (iii)    Employer shall provide Employee with other executive
         perquisites as may be

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         available to or deemed appropriate for Employee by the Board and
         participation in all other Employer-wide employee benefits as available
         from time to time.

         3.       [Intentionally left blank.]

         4.       Non-Competition.

         (a)      Employee hereby agrees that Employee will not, during the
period of Employee's employment with Employer, and for a period of one (1) year
following the date Employee ceases to be employed by Employer or any direct or
indirect subsidiary of Employer, for any reason whatsoever, directly or
indirectly, for himself or on behalf of or in conjunction with any other person,
persons, company, partnership, corporation or business of whatever nature:

                  (i)      engage, as an officer, director, shareholder, owner,
         partner, joint venturer or in a managerial capacity, whether as an
         employee, independent contractor, consultant or advisor or as a sales
         representative, in any specialty electrical, telecom or cable
         television contracting business for electric utilities,
         telecommunications and cable television providers, and transportation,
         commercial and industrial customers, within the United States or within
         100 miles of any other geographic area in which Employer or any of
         Employer's direct or indirect subsidiaries conducts business, including
         any territory serviced by Employer or any of its subsidiaries (the
         "Territory");

                  (ii)     call upon any person who is, at that time, within the
         Territory, an employee of Employer (including the subsidiaries thereof)
         for the purpose or with the intent of enticing such employee away from
         or out of the employ of Employer (including the direct or indirect
         subsidiaries thereof);

                  (iii)    call upon any person or entity which is, at that
         time, or which has been, within one (1) year prior to that time, a
         customer of Employer (including the direct or indirect subsidiaries
         thereof) within the Territory for the purpose of soliciting or selling
         products or services in direct competition with Employer or any direct
         or indirect subsidiary of Employer within the Territory; or

                  (iv)     call upon any prospective acquisition candidate, on
         Employee's own behalf or on behalf of any competitor, which candidate
         was, to Employee's actual knowledge after due inquiry, either called
         upon by Employer including the direct or indirect subsidiaries thereof)
         or for which Employer made an acquisition analysis, for the purpose of
         acquiring such entity.

         Notwithstanding the above, the foregoing covenant shall not be deemed
to prohibit Employee from acquiring as an investment not more than two percent
(2%) of the capital stock of a competing business, whose stock is traded on a
national securities exchange or over-the-counter.

         (b)      Because of the difficulty of measuring economic losses to
Employer as a result of a breach of the foregoing covenant, and because of the
immediate and irreparable damage that could be caused to Employer for which it
would have no other adequate remedy, Employee agrees that the

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foregoing covenant may be enforced by Employer in the event of breach by him, by
injunctions and restraining orders.

         (c)      It is agreed by the parties that the foregoing covenants in
this Paragraph 4 impose a reasonable restraint on Employee in light of the
activities and business of Employer (including Employer's direct and indirect
subsidiaries) on the date of the execution of this Agreement and the current
plans of Employer (including Employer's direct and indirect subsidiaries); but
it is also the intent of Employer and Employee that such covenants be construed
and enforced in accordance with the changing activities, business and locations
of Employer (including Employer's direct and indirect subsidiaries) throughout
the term of this Agreement, whether before or after the date of termination of
the employment of Employee. For example, if, during the term of this Agreement,
Employer (including Employer's direct and indirect subsidiaries) engages in new
and different activities, enters a new business or establishes new locations for
its current activities or business in addition to or other than the activities
or business enumerated under the Recitals above or the locations currently
established therefor, then Employee will be precluded from soliciting the
customers or employees of such new activities or business or from such new
location and from directly competing with such new business within 100 miles of
its then-established operating location(s) through the term of this Agreement.

         It is further agreed by the parties hereto that, in the event that
Employee shall cease to be employed hereunder, and shall enter into a business
or pursue other activities not in competition with Employer (including
Employer's direct and indirect subsidiaries), or similar activities, or business
in locations the operation of which, under such circumstances, does not violate
clause (a)(i) of this Paragraph 4, and in any event such new business,
activities or location are not in violation of this Paragraph 4 or of employee's
obligations under this Paragraph 4, if any, Employee shall not be chargeable
with a violation of this Paragraph 4 if Employer (including Employer's direct
and indirect subsidiaries) shall thereafter enter the same, similar or a
competitive (i) business, (ii) course of activities or (iii) location, as
applicable.

         (d)      The covenants in this Paragraph 4 are severable and separate,
and the unenforceability of any specific covenant shall not affect the
provisions of any other covenant. Moreover, in the event any court of competent
jurisdiction shall determine that the scope, time or territorial restrictions
set forth are unreasonable, then it is the intention of the parties that such
restrictions been enforced to the fullest extent which the court deems
reasonable, and the Agreement shall be reformed in accordance therewith.

         (e)      All of the covenants in this Paragraph 4 shall be construed as
an agreement independent of any other provision in this Agreement, and the
existence of any claim or cause of action of Employee against Employer, whether
predicated on this Agreement or otherwise, shall not constitute a defense to the
enforcement by Employer of such covenants.

         (f)      Notwithstanding any other provision of this Agreement, if
Employee's employment is terminated by Employer for other than good cause, then
no non-competition provision shall be enforceable for any period of time
following expiration of the Severance Period as defined in Paragraph 6(d) below.

                                       -4-

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         5.       Place of Performance.

         Nothing contained herein shall be deemed to require Employee to
relocate from Employee's present residence to another geographic location to
carry out Employee's duties and responsibilities under this Agreement.

         6.       Term; Termination; Rights on Termination.

         The term of this Agreement shall begin on the date hereof and continue
for three (3) years (the "Initial Term"), and thereafter, unless terminated
sooner as herein provided, shall automatically renew for consecutive one-year
terms on the same terms and conditions in effect as of the time of each such
renewal (each such one-year term, a "Renewal Term" and, all Renewal Terms
together with the Initial Term, the "Term"). This Agreement and/or Employee's
employment may be terminated in any one of the followings ways:

         (a)      Death. The death of Employee shall immediately terminate this
Agreement with no severance compensation due to Employee's estate.

         (b)      Disability. If, as a result of incapacity due to physical or
mental illness or injury, Employee shall have been absent from Employee's
full-time duties hereunder for four (4) consecutive months, then thirty (30)
days after receiving written notice (which notice may occur before or after the
end of such four (4) month period, but which shall not be effective earlier than
the last day of such four (4) month period), Employer may terminate Employee's
employment hereunder provided Employee is unable to resume Employee's full-time
duties at the conclusion of such notice period. Also, Employee may terminate
Employee's employment hereunder if his health should become impaired to an
extent that makes the continued performance of Employee's duties hereunder
hazardous to Employee's physical or mental health or life, provided that
Employee shall have furnished Employer with a written statement from a qualified
doctor to such effect and provided, further, that, at Employer's request made
within thirty (30) days of the date of such written statement, Employee shall
submit to an examination by a doctor selected by Employer who is reasonably
acceptable to Employee or Employee's doctor and such doctor shall have concurred
in the conclusion of Employee's doctor. In the event this Agreement is
terminated as a result of Employee's disability, Employee shall receive from
Employer, in a lump-sum payment due within ten (10) days of the effective date
of termination, the base salary at the rate then in effect for whatever time
period is remaining under the Term of this Agreement or for one (1) year,
whichever amount is greater.

         (c)      Good Cause; Good Reason. Employer may terminate the Agreement
ten (10) days after delivery of written notice to Employee for "good cause",
which shall be: (i) Employee's willful, material and irreparable breach of this
Agreement; (ii) Employee's gross negligence in the performance or intentional
nonperformance or inattention continuing for ten (10) days after receipt of
written notice of need to cure of any of Employee's material duties and
responsibilities hereunder; (iii) Employee's willful dishonesty, fraud or
material misconduct with respect to the business or affairs of Employer; (iv)
Employee's conviction of a felony crime; or (5) chronic alcohol abuse or illegal
drug abuse by Employee. In the event of a termination for good cause, as
enumerated above,

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Employee shall have no right to any severance compensation.

         Employee may terminate his employment under this Agreement ten (10)
days after delivery of written notice to Employer for "good reason", which shall
exist if, within twelve (12) months following a Change in Control, Employee (i)
is offered a Lesser Position (as defined below), or (ii) is required to relocate
in violation of Paragraph 5 of this Agreement. "Lesser Position" shall mean a
new position or a change in the Employee's position, which, compared with
Employee's position with Employer immediately prior to the Change in Control,
(i) offers a lower level of compensation (including base salary, fringe benefits
and target bonuses under any corporate-performance based bonus or incentive
programs), or (ii) materially reduces Employee's duties or level of
responsibility. In the event of such a termination of his employment, Employee
shall be entitled to receive severance benefits as provided in Paragraph 13(d)
below.

         (d)      Without Good Cause. At any time after the commencement of
employment, either Employee or Employer may, without good reason or good cause,
respectively, terminate this Agreement and Employee's employment, effective
thirty (30) days after written notice is provided to the other party. Should
Employee be terminated by Employer without good cause during the Term, Employer
shall deliver to Employee promptly a waiver and release agreement waiving and
releasing any claims Employee may have against Employer under the terms of this
Agreement in form reasonably satisfactory to Employer and Employee, and upon
Employee's execution thereof, Employee shall receive from Employer, in a
lump-sum payment due on the effective date of termination, the base salary at
the rate then in effect for whatever time period is remaining under the Term
(the Initial Term or the then current Renewal Term, as applicable) or for one
(1) year, whichever amount is greater (such period of time, the "Severance
Period"). If Employee resigns or otherwise terminates Employee's employment
without good reason pursuant to this Paragraph 6(d), Employee shall receive no
severance compensation.

         (e)      Change in Control of Employer. In the event of a "Change in
Control of Employer" (as defined below) during the Term, refer to Paragraph 13
below.

         Upon termination of his employment for any reason provided above,
Employee shall be entitled to receive all compensation earned and all benefits
and reimbursements due through the effective date of termination. Additional
compensation subsequent to termination, if any, will be due and payable to
Employee only to the extent and in the manner expressly provided above or in
Paragraph 13 hereof. All other rights and obligations of Employer and Employee
under this Agreement shall cease as of the effective date of termination, except
that Employer's obligations under Paragraph 10 hereof and Employee's obligations
under Paragraphs 4, 7, 8, 9, 11 and 18 hereof shall survive such termination in
accordance with their terms.

         If termination of Employee's employment arises out of Employer's
failure to pay Employee on a timely basis the amounts to which he is entitled
under this Agreement or as a result of any other breach of this Agreement by
Employer, as determined by a court of competent jurisdiction or pursuant to the
provisions of Paragraph 18 below, Employer shall pay all amounts and damages to
which Employee may be entitled as a result of such breach, including interest
thereon and all reasonable legal fees and expenses and other costs incurred by
Employee to enforce Employee's

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<PAGE>

rights hereunder.

         7.       Return of Company Property.

         All records, designs, patents, business plans, financial statements,
manuals, memoranda, lists and other property delivered to or compiled by
Employee by or on behalf of Employer, or its representatives, vendors or
customers which pertain to the business of Employer shall be and remain the
property of Employer, and be subject at all times to its discretion and control.
Likewise, all correspondence, reports, records, charts, advertising materials,
and other similar data pertaining to the business, activities or future plans of
Employer which is collected by Employee shall be delivered promptly to Employer
without request by it upon termination of Employee's employment.

         8.       Inventions.

         Employee shall disclose promptly to Employer any and all significant
conceptions and ideas for inventions, improvements and valuable discoveries,
whether patentable or not, which are conceived or made by Employee, solely or
jointly with another, during the period of employment or within one (1) year
hereafter, and which are directly related to the business or activities of
Employer and which Employee conceives as a result of Employee's employment by
Employer. Employee hereby assigns and agrees to assign all of Employee's
interests therein to Employer or its nominee. Whenever requested to do so by
Employer, Employee shall execute any and all applications, assignments or other
instruments that Employer shall deem necessary to apply for and obtain Letters
Patent of the United States or any foreign country or to otherwise protect
Employer's interest therein.

         9.       Trade Secrets.

         Employee agrees that he will not, during or after the Term of this
Agreement with Employer, disclose the specific terms of Employer's or its
subsidiaries' relationships or agreements with its significant vendors or
customers or any other significant and material trade secret of Employer or its
subsidiaries, whether in existence or proposed, to any person, firm,
partnership, corporation or business for any reason or purpose whatsoever other
than in the course of performing Employee's duties hereunder.

         10.      Indemnification.

         In the event Employee is made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by Employer against Employee), by reason of
the fact that Employee is or was performing services under this Agreement, then
Employer shall indemnify Employee against all expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement, as actually and
reasonably incurred by Employee in connection therewith except to the extent
that such expenses result from Employee's gross, willful or wanton negligence or
misconduct or fraud or criminal acts. In the event that both Employee and
Employer are made a party to the same third-party action, complaint, suit or
proceeding, Employer agrees to engage competent legal representation, and
Employee agrees to use the same representation, provided that if counsel
selected by Employer shall have a conflict of

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<PAGE>

interest that prevents such counsel from representing Employee, Employee may
engage separate counsel and Employer shall pay all attorneys' fees of such
separate counsel. Further, while Employee is expected at all times to use
Employee's best efforts to faithfully discharge his duties under this Agreement,
Employee cannot be held liable to Employer for errors or omissions made in good
faith where Employee has not exhibited gross, willful or wanton negligence or
misconduct or performed criminal and fraudulent acts that materially damage the
business of Employer.

         11.      No Prior Agreements.

         Employee hereby represents and warrants to Employer that the execution
of this Agreement by Employee and his employment by Employer and the performance
of Employee's duties hereunder will not violate or be a breach of any agreement
with a former employer, client or any other person or entity. Further, Employee
agrees to indemnify Employer for any claim, including but not limited to
attorneys' fees and expenses of investigation, by any such third party that such
third party may now have or may hereafter come to have against Employer based
upon or arising out of any noncompetition agreement, invention or secrecy
agreement between Employee and such third party which was in existence as of the
date of this Agreement.

         12.      Assignment; Binding Effect.

         Employee understands that he has been selected for employment by
Employer on the basis of Employee's personal qualifications, experience and
skills. Employee, therefore, shall not assign all or any portion of Employee's
performance under this Agreement, or any benefits received by Employee pursuant
to this Agreement except by will or the laws of descent. Subject to the
preceding two sentences and the express provisions of Paragraph 13 below, this
Agreement shall be binding upon, inure to the benefit of and be enforceable by
the parties hereto and their respective heirs, legal representatives, successors
and assigns.

         13.      Change in Control.

         (a)      Employee understands and acknowledges that Employer may be
merged or consolidated with or into another entity and that such entity shall
automatically succeed to the rights and obligations of Employer hereunder or
that Employer may undergo another type of Change in Control. In the event such a
merger or consolidation or other Change in Control is initiated prior to the end
of the Term, then the provisions of this Paragraph 13 shall be applicable.

         (b)      In the event of a pending Change in Control wherein Employer
and Employee have not received written notice at least five (5) business days
prior to the anticipated closing date of the transaction giving rise to the
Change in Control from the successor to all or a substantial portion of
Employer's business and/or assets that such successor is willing as of the
closing to assume and agree to perform Employer's obligations under this
Agreement in the same manner and to the same extent that Employer is hereby
required to perform, then such Change in Control shall be deemed to be a
termination of this Agreement by Employer without good cause during the Term,
and (i) the noncompetition provision of Paragraph 4 shall not apply; (ii)
Employee shall receive from Employer, in a lump-sum payment due on the effective
date of such termination, an amount equal to three times

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<PAGE>

the sum of (A) the Employee's annual Base Salary and (B) the higher of (x) the
highest annual bonus paid to Employee under the Company's Annual Incentive Plan
in effect on the date hereof or a direct predecessor thereto or replacement
thereof, for the past three fiscal years and (y) the Employee's annual bonus
paid or payable, including any bonus or portion thereof which has been earned
but deferred, under the Company's Annual Incentive Plan in effect on the date
hereof or a direct predecessor thereto or replacement thereof (and annualized
for any fiscal year during which the Employee was employed for less than 12 full
months), for the most recently completed or current fiscal year during the Term;
and (iii) until the third anniversary of the effective date of such termination,
Employee and, if applicable, Employee's dependents 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) (collectively, "Employer Welfare Programs") to the
extent applicable generally to other peer executives of Employer and its
affiliated companies at the same after-tax cost to Employee as if Employee was
employed by Employer, but in no event shall such Employer Welfare Programs
provide Employee with benefits that are less favorable, in the aggregate, than
the most favorable of such Employer Welfare Programs in effect for Employee at
any time during the 120-day period immediately preceding the date of such
termination; provided, however if Employer is unable to provide Employee and/or,
if applicable, any of Employee's dependents, with any benefits to which Employee
or such dependent is entitled pursuant to the terms of this Section 13(b)(iii)
under any of the Employer Welfare Programs, Employer shall at its cost provide
such benefit at a level no less favorable to Executive than would have been
provided under the Employer Welfare Programs under another plan or arrangement,
including an individual policy purchased by Employer for Employee or such
dependent(s). Employee agrees that if any benefit to be provided under the
Employer Welfare Programs is subject to the provisions of Part 6 of Subtitle B
of Title I of the Employee Retirement Income Security Act of 1974, as amended
("COBRA"), Employee shall make a timely COBRA election to continue such benefit
under COBRA during the applicable COBRA continuation period and Employer shall
reimburse Employee for the amount of the COBRA premiums, if any, required to be
paid by Employee for such coverage.

         (c)      Employee will be given sufficient time and opportunity to
elect whether to exercise all or any of Employee's vested options to purchase
Employer Common Stock, including any options with accelerated vesting under the
provisions of Employer's 1997 Stock Option Plan or any other Employer stock
incentive plan, such that Employee may convert the options to shares of Employer
Common Stock at or prior to the closing of the transaction giving rise to the
Change in Control, if Employee so desires.

         (d)      In the event that a successor in a pending Change in Control
gives notice pursuant to Paragraph 13(b) that it will assume Employer's
obligations under this Agreement and at the time of or within twelve (12) months
following such Change in Control Employee either (i) terminates this Agreement
for good reason (as defined in Paragraph 6(c) of this Agreement) or (ii) is
terminated by Employer other than for good cause (as defined in Paragraph 6(c)
of this Agreement), then effective as of the date of such termination, (A) the
noncompetition provisions of Paragraph 4 shall no longer apply; (B) Employee
shall receive from Employer, in a lump-sum payment due on the effective date of
such termination, an amount equal to three times the sum of (1) the Employee's
annual Base

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Salary and (2) the higher of (x) the highest annual bonus paid to Employee under
the Company's Annual Incentive Plan in effect on the date hereof or a direct
predecessor thereto or replacement thereof, for the past three fiscal years and
(y) the Employee's annual bonus paid or payable, including any bonus or portion
thereof which has been earned but deferred, under the Company's Annual Incentive
Plan in effect on the date hereof or a direct predecessor thereto or replacement
thereof (and annualized for any fiscal year during which the Employee was
employed for less than 12 full months), for the most recently completed or
current fiscal year during the Term; and (C) until the third anniversary of the
effective date of such termination, Employee and, if applicable, Employee's
dependents 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) (collectively, "Employer
Welfare Programs") to the extent applicable generally to other peer executives
of Employer and its affiliated companies at the same after-tax cost to Employee
as if Employee was employed by Employer, but in no event shall such Employer
Welfare Programs provide Employee with benefits that are less favorable, in the
aggregate, than the most favorable of such Employer Welfare Programs in effect
for Employee at any time during the 120-day period immediately preceding the
date of such termination; provided, however if Employer is unable to provide
Employee and/or, if applicable, any of Employee's dependents, with any benefits
to which Employee or such dependent is entitled pursuant to the terms of this
Section 13(b)(iii) under any of the Employer Welfare Programs, Employer shall at
its cost provide such benefit at a level no less favorable to Executive than
would have been provided under the Employer Welfare Programs under another plan
or arrangement, including an individual policy purchased by Employer for
Employee or such dependent(s). Employee agrees that if any benefit to be
provided under the Employer Welfare Programs is subject to the provisions of
Part 6 of Subtitle B of Title I of the Employee Retirement Income Security Act
of 1974, as amended ("COBRA"), Employee shall make a timely COBRA election to
continue such benefit under COBRA during the applicable COBRA continuation
period and Employer shall reimburse Employee for the amount of the COBRA
premiums, if any, required to be paid by Employee for such coverage.

         (e)      A "Change in Control" shall be deemed to have occurred if:

                  (i)      any person or entity, other than Employer or an
         employee benefit plan of Employer, acquires directly or indirectly the
         Beneficial Ownership (as defined in Section 13(d) of the Securities
         Exchange Act of 1934, as amended) of any voting security of 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 Employer;

                  (ii)     the following individuals no longer constitute a
         majority of the members of the Board: (A) the individuals who, as of
         the date hereof, constitute the Board (the "Current Directors"); (B)
         the individuals who thereafter are elected to the Board and whose
         election, or nomination for election, to the Board was approved by a
         vote of at least two-thirds (2/3) of the Current Directors then still
         in office (such directors becoming "Additional Current Directors"
         immediately following their election); and (C) the individuals who are
         elected to the Board and whose election, or nomination for election, to
         the Board was approved by a

                                      -10-

<PAGE>

         vote of at least two-thirds (2/3) of the Current Directors and
         Additional Current Directors then still in office (such directors also
         becoming "Additional Current Directors" immediately following their
         election); or

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

         (f)      Intentionally left blank.

         (g)      Employee shall be reimbursed by Employer or its successor for
all excise taxes that Employee incurs under Section 4999 of the Internal Revenue
Code of 1986, as amended, as a result of any Change in Control, such amount to
be determined by Employer or by an accounting firm chosen by Employer. In
addition, Employee shall be reimbursed by Employer or its successor for all
federal, state and local income taxes and additional excise taxes attributable
to the payment pursuant to the preceding sentence and the payment pursuant to
this sentence. The amounts, as determined and described in the preceding
sentences of this paragraph (g), will be due and payable by Employer or its
successor within ten (10) days after Employee delivers a written request for
reimbursement accompanied by a copy of Employee's tax return(s) as filed
reflecting the excise tax paid by Employee; provided, however, if Employee's tax
return reflects an excise tax amount that is less than the amount determined by
the Employer or its accounting firm pursuant to this paragraph (g), the Employer
shall be required to reimburse Employee in an amount equal to such lesser
amount. In addition, if at any time the Employee receives a refund from the
Internal Revenue Service of all or any portion of the amount of the excise tax
or federal, state or local income taxes described in this paragraph (g) that
were paid to Employee by Employer, Employee shall pay Employer the amount of the
refund within ten (10) days of Employee's receipt of such refund. The amount
reimbursed by Employer hereunder shall not be subject to offset or reduction for
any amount owed or claimed to be owed to Employer or its successor by Employee.
If not paid within ten (10) days from date of demand, the amount due under this
subsection shall bear interest at the maximum non-usurious rate allowed by law
from the date of demand to the date of payment.

         14.      Complete Agreement.

         This Agreement is not a promise of future employment. This Agreement,
together with that certain Employment Agreement between Employer and Employee
dated March 13, 2002 (the "Change in Control Agreement" and together with this
Agreement, the "Employment Documents") supersede any other agreements or
understandings, written or oral, between Employer and Employee, and Employee has
no oral representations, understandings or agreements with Employer or any of
its officers, directors or representatives covering the same subject matter as
the Employment Documents. The Employment Documents are the final, complete and
exclusive statement and expression of the agreement between Employer and
Employee, and the Employment Documents cannot be varied, contradicted or
supplemented by evidence of any prior or contemporaneous oral or written
agreements. This written Agreement may not be later modified except by a written
instrument signed by a duly authorized officer of Employer and Employee, and no
term of this Agreement may be waived except by a written instrument signed by
the party waiving the benefit of

                                      -11-

<PAGE>
such term. To the extent that the Change in Control Agreement conflicts with
this Agreement, the terms of the Change in Control Agreement shall control.

         15.      No Offset.

         Severance payment(s) made pursuant to this Agreement are not subject to
offset or reduction for any amount owed, or claimed to be owed, to Employer or
its successor by Employee.

         16.      Notice.

         Whenever any notice is required hereunder, it shall be given in writing
addressed as follows:

         To Employer:               Quanta Services, Inc.
                                    1360 Post Oak Boulevard, Suite 2100
                                    Houston, Texas 77056
                                    Attention: General Counsel

         To Employee:               106 North Wynden Estates Court, #3019
                                    Houston, Texas 77056

All notices, requests, consents, and other communications under this Agreement
will be in writing and will be delivered by hand, by nationally recognized
overnight courier service, by postage prepaid first class certified or
registered mail, return receipt requested, or by facsimile with receipt
confirmed. Notices provided in accordance with this Section 15 will be deemed
delivered upon (a) personal delivery; (b) one (1) Business Day after delivery to
a nationally recognized overnight courier service; (c) three (3) Business Days
after deposit in the mail; or (d) confirmation of facsimile delivery. Either
party may change the address for notice by notifying the other party of such
change in accordance with this paragraph.

         17.      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 paragraph 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.

         18.      Arbitration.

         Any unresolved dispute or controversy arising under or in connection
with this Agreement shall be settled exclusively by arbitration, conducted
before a panel of three (3) arbitrators in Houston, Texas, in accordance with
the National 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. The arbitrators shall not have the authority to add to,
detract from or modify any provision hereof nor to award punitive damages to any
injured party. The arbitrators shall have the

                                      -12-

<PAGE>

authority to order back-pay, severance compensation, vesting of options (or cash
compensation in lieu of vesting of options), reimbursement of costs (including
reasonable attorneys' fees), including those incurred to enforce this Agreement,
and interest thereon in the event the arbitrators determine that Employee was
terminated without disability or good cause, as defined in Paragraphs 6(b) and
6(c) hereof, respectively, or that Employer has otherwise materially breached
this Agreement. A decision by a majority of the arbitration panel shall be final
and binding. Judgment may be entered on the arbitrators' award in any court
having jurisdiction. The direct expense of any arbitration proceeding shall be
borne by Employer.

         19.      Governing Law.

         This Agreement shall in all respects be construed according to the laws
of the State of Texas.

         20.      Counterparts.

         This Agreement may be executed simultaneously in two (2) or more
counterparts, each of which shall be deemed an original and all of which
together shall constitute but one and the same instrument.

                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

                                      -13-

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

EMPLOYER:                                   EMPLOYEE:
QUANTA SERVICES, INC.                       JOHN R. COLSON

By: /s/ JAMES H. HADDOX                     By: /s/ JOHN R. COLSON
    --------------------                        ----------------------------
    James H. Haddox, CFO                        John R. Colson, Individually

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