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+--------+
| FORM 4 |                  UNITED STATES SECURITIES AND EXCHANGE COMMISSION
+--------+                               WASHINGTON, D.C. 20549
[_] Check this box if
    no longer subject         STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
    to Section 16.
    Form 4 or Form 5       Filed pursuant to Section 16(a) of the Securities
    obligations may           Exchange Act of 1934, Section 17(a) of the
    continue. See            Public Utility Holding Company Act of 1935 or
    Instruction 1(b).      Section 30(f) of the Investment Company Act of 1940

(Print or Type Responses)

--------------------------------------------------------------------------------
1.  Name and Address of Reporting Person*

        Foster,                     Vincent                           D.
--------------------------------------------------------------------------------
        (Last)                      (First)                        (Middle)

                         1300 Post Oak Blvd., Suite 800
--------------------------------------------------------------------------------
                                   (Street)

        Houston                      Texas                            77056
--------------------------------------------------------------------------------
        (City)                      (State)                           (Zip)


2.  Issuer Name and Ticker or Trading Symbol Quanta Services, Inc.; Symbol "PWR"
                                             -----------------------------------

3.  I.R.S. Identification Number of Reporting Person, if an entity
    (voluntary)
                --------------

4.  Statement for Month/Year   12/01
                             ---------------------------------------------------

5.  If Amendment, Date of Original (Month/Year)  01/09/02
                                               ---------------------------------


6.  Relationship of Reporting Person(s) to Issuer (Check all applicable)


     X   Director        Officer                 10% Owner        Other
    ---             --- (give title below)   ---              ---(specify below)

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

7.  Individual or Joint/Group Filing (Check Applicable Line)

      X  Form filed by One Reporting Person
    ----
         Form filed by More than One Reporting Person
    ----






Table I--Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned



------------------------------------------------------------------------------------------------------------------------------------
1. Title              2. Trans-  3. Trans-       4. Securities Acquired (A)        5. Amount of         6. Owner-     7. Nature
   of                    action     action          or Disposed of (D)                Securities           ship          of In-
   Security              Date       Code            (Instr. 3, 4 and 5)               Beneficially         Form:         direct
   (Instr. 3)            (Month/    (Instr. 8)                                        Owned at             Direct        Bene-
                         Day/    -----------------------------------------------      End of               (D) or        ficial
                         Year)                                                        Month                Indirect      Owner-
                                  Code       V   Amount        (A) or    Price        (Instr. 3 and 4)     (I)           ship
                                                               (D)                                         (Instr. 4)    (Instr. 4)
------------------------------------------------------------------------------------------------------------------------------------
                                                                                          
                                                                                                                     Main Street
Limited Vote Common                                                                                                  Equity Ventures
 Stock                  12/12/01  J(1)           15,564         D        15.70              0                 I      II, L.P.(2)
------------------------------------------------------------------------------------------------------------------------------------
Limited Vote Common
 Stock                                                                                   191,698              D
------------------------------------------------------------------------------------------------------------------------------------

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



  Table II--Derivative Securities Acquired, Disposed of, or Beneficially Owned
        (e.g., puts, calls, warrants, options, convertible securities)



-----------------------------------------------------------------------------------------------------------------------------
 1. Title of Derivative            2. Conver-          3. Trans-           4. Transac-            5. Number of Deriv-
    Security (Instr. 3)               sion or             action              tion Code              ative Securities
                                      Exercise            Date                (Instr. 8)             Acquired (A) or
                                      Price of            (Month/                                    Disposed of (D)
                                      Deriv-              Day/                                       (Instr. 3, 4, and 5)
                                      ative               Year)
                                      Security

                                                                           ---------------------------------------------------
                                                                           Code      V                 (A)         (D)

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

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

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



 Table II--Derivative Securities Acquired, Disposed of, or Beneficially Owned
   (e.g., puts, calls, warrants, options, convertible securities)


------------------------------------------------------------------------------------------------------------------------------------
                              6. Date Exer-     7. Title and Amount of       8. Price    9. Number       10. Owner-    11. Nature
                                 cisable and       Underlying Securities        of          of Deriv-        ship          of In-
                                 Expiration        (Instr. 3 and 4)             Deriv-      ative            Form          direct
                                 Date                                           ative       Secur-           of De-        Benefi-
                                 (Month/Day/                                    Secur-      ities            rivative      cial
                                 Year)                                          ity         Bene-            Security      Owner-
                                                                                (Instr.     ficially         Direct        ship
                               --------------------------------------------     5)          Owned            (D) or        (Instr.
                               Date     Expira-              Amount or                      at End           Indirect      4)
                               Exer-    tion         Title   Number of                      of Month         (I)
                               cisable  Date                 Shares                         (Instr. 4)       (Instr. 4)
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               

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

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

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




Explanation of Responses:
(1) Exchange for redemption of limited partnership interests in Main Street
    Equity Ventures II, L.P.
(2) The reporting person is Managing Director of Main Street Equity Ventures II,
    L.P.

             /s/ Vincent D. Foster               01/14/02
          -------------------------------  -----------------
                 Vincent D. Foster                Date

Reminder: Report on a separate line for each class of securities beneficially
          owned directly or indirectly.

        * If the form is filed by more than one reporting person, see
          Instruction 4(b)(v).

       ** Intentional misstatements or omissions of facts constitute Federal
          Criminal Violations.
          See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

   Note: File three copies of this Form, one of which must be manually signed.
         If space is insufficient, see Instruction 6 for procedure.

                                                                  SEC 1474(3-99)