VERITAS DGC INC
SC 13G/A, 1997-02-14
OIL & GAS FIELD EXPLORATION SERVICES
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 1 )*

                               Veritas DGC Inc.
                               (Name of Issuer)

                         Common Stock, $.01 par value
                        (Title of Class of Securities)

                                   253804108
                                (CUSIP Number)

*  The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however see the Notes).

                               Page 1 of 7 Pages
<PAGE>
 
- -----------------------                                  ---------------------
CUSIP NO. 253804108                  13G                   Page 2 of 7 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON 
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: 36-3820584

         Wanger Asset Management, L.P.
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5     
     NUMBER OF              None 
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6    
                            400,00
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7     
    REPORTING               None

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8    
                            400,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9    
        400,000

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                  
       
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11     
        2.17%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
        IA

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

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 253804108                   13G                Page 3 of 7 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
        Wanger Asset Management, Ltd. 
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
        Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5     
     NUMBER OF              None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6    
                            400,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7     
    REPORTING               None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8      
                            400,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9    
        400,000

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                  
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
        2.17%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
        CO

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

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 253804108                   13G                Page 4 of 7 Pages
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
        Ralph Wanger
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4    
        U.S.A.

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5     
     NUMBER OF              None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6    
                            400,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7     
    REPORTING               None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8      
                            400,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9    
        400,000

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                  
      
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
        2.17%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
        IN

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

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
Page 5 of 7 Pages
 
Item 1(a)  Name of Issuer:  Veritas DGC Inc. (formerly, Digicon Inc.)

Item 1(b)  Address of Issuer's Principal Executive Offices:
           3701 Kirby Drive, Suite 112
           Houston, TX 77098

Item 2(a)  Name of Person Filing:
             Wanger Asset Management, L.P. ("WAM");
             Wanger Asset Management, Ltd., the general partner of WAM
               ("WAM LTD.");
             Ralph Wanger ("Wanger")

Item 2(b)  Address of Principal Business Office:
             WAM, WAM LTD. and Wanger are all located at:
             227 West Monroe Street, Suite 3000
             Chicago, Illinois 60606

Item 2(c)  Citizenship:
             WAM is a Delaware limited partnership.
             WAM LTD. is a Delaware corporation.
             Wanger is a U.S. citizen.

Item 2(d)  Title of Class of Securities:  Common Stock, $.01 par value

Item 2(e)  CUSIP Number: 253804108

Item 3     Type of Person:
           (e)  WAM is an Investment Adviser registered under section 203
                of the Investment Advisers Act of 1940; WAM LTD. is the
                general partner of the Investment Adviser; Wanger is the
                principal stockholder of the general partner.

Item 4     Ownership (at December 31, 1996):
           (a)  Amount owned "beneficially" within the meaning of rule
                13d-3:  400,000
           (b)  Percent of class:  2.17% (based on 18,446,568 shares 
                outstanding)
           (c)  Number of shares as to which such person has:
                   (i)  sole power to vote or to direct the vote:  None
                  (ii)  shared power to vote or to direct the vote: 400,000
                 (iii)  sole power to dispose or to direct the disposition
                        of:  None
                  (iv)  shared power to dispose or to direct the disposition
                        of: 400,000

           WAM serves as investment adviser to Acorn Investment Trust, Series
           Designated Acorn Fund (the "Trust"). Various of WAM's limited
           partners and employees are also officers and trustees of the Trust,
           but WAM does not consider the Trust to be controlled by such persons.
           Although the Trust is not controlled by WAM, pursuant to rule 13d-
           3(a) the 400,000 shares beneficially owned by the Trust, with respect
           to which the Trust has delegated to WAM shared voting power and
           shared dispositive power, are considered to be shares beneficially
           owned by WAM by reason of such delegated powers. In addition to the
           shares beneficially owned by the Trust, other clients of WAM may own
           shares which are not included in the aggregate number of shares
           reported herein because WAM does not have or share voting or
           investment power over those shares.
<PAGE>
 
Page 6 of 7 Pages

Item 5     Ownership of Five Percent or Less of a Class:

           If this statement is being filed to report the fact that as of the
           date hereof the reporting person has ceased to be the beneficial
           owner of more than five percent of the class of securities, check
           the following (x).

Item 6     Ownership of More than Five Percent on Behalf of Another Person:
           The shares reported herein have been acquired on behalf of
           discretionary clients of WAM.  Persons other than WAM are entitled
           to receive all dividends from, and proceeds from the sale of, those
           shares.

Item 7     Identification and Classification of the Subsidiary Which Acquired
           the Security Being Reported on by the Parent Holding Company:
           Not Applicable

Item 8     Identification and Classification of Members of the Group:
           Not Applicable

Item 9     Notice of Dissolution of Group:
           Not Applicable

Item 10    Certification:

           By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired in the ordinary course of
business and were not acquired for the purpose of and do not have the effect of
changing or influencing the control of the issuer of such securities and were
not acquired in connection with or as a participant in any transaction having
such purpose or effect.
<PAGE>
 
Page 7 of 7 Pages

                                   Signature

           After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true, complete and
correct.

Date: February 14, 1997

                    The undersigned corporation, on the date above written,
                    agrees and consent to the joint filing on its behalf of
                    this Schedule 13G in connection with its beneficial
                    ownership of the security reported herein.

                                          WANGER ASSET MANAGEMENT, LTD.
                                            for itself and as general partner of
                                            WANGER ASSET MANAGEMENT, L.P.

                                          By:  /s/Bruce H. Lauer
                                            ---------------------------
                                               Bruce H. Lauer
                                               Vice President

                    The undersigned individual, on the date above written,
                    agrees and consent to the joint filing on his behalf of
                    this Schedule 13G in connection with his beneficial
                    ownership of the security reported herein.

                                             Ralph Wanger


                                         /s/ Ralph Wanger
                                         ------------------------------


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