DOMINION BRIDGE CORP
SC 13D, 1997-08-19
HEAVY CONSTRUCTION OTHER THAN BLDG CONST - CONTRACTORS
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<PAGE>

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                 SCHEDULE 13D

                 UNDER THE SECURITIES EXCHANGE ACT OF 1934
                            (AMENDMENT NO.          )*
                                          ---------

                             Dominion Bridge Corporation
           --------------------------------------------------------
                                (Name of Issuer)

                   Class A Common Stock, par value $.001 per share
           --------------------------------------------------------
                          (Title of Class of Securities)

                                      0002571921
           --------------------------------------------------------
                                 (CUSIP Number)

 Douglas A. Gerrard, Deere Parke Equities, L.L.C., 650 Dundee Road, Suite 460,
                 Northbrook, IL 60062; Telephone no. (847) 509-8500
           --------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                    August 7, 1997
           --------------------------------------------------------
            (Date of Event Which Requires Filing of This Statement)

   If the  filing  person has  previously filed a  statement on Schedule 13G to
report the  acquisition  which  is the  subject  of this  Schedule 13D,  and is
filing this  schedule  because of Rule 13d-1(b)(3) or (4),  check the following
box:        / /

   NOTE:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  SEE Rule 13d-1(a) for other parties to whom copies are to
be sent.

   *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 disclosures provided in a prior cover page.

   The information  required on 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>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Deere Park Equities, L.L.C.
- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/(1)
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     WG/OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Illinois

- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                0
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  2,110,100
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  0
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  2,110,100
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     2,110,100
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     7.3%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     00
- -------------------------------------------------------------------------------

- ------------------------
(1) The filing person is also filing this Schedule 13D in its individual
    capacity.

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Douglas A. Gerrard

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/(2)
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     United States
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                0
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  2,110,100
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  0
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  2,110,100
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     2,110,100
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     7.3%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

- ------------------------
(2) The filing person is also filing this Schedule 13D in his individual
    capacity.

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     STG Investments, Ltd.

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Liberia
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                0
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  0
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     0
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     0%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     CO
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Leonard Feldman

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     United States
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                0
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  0
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     0
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     0%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Michel L. Marengere

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/(3)
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                825,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  1,659,792
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  825,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  1,659,792
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     2,484,792
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     8.3%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

- ------------------------
(3) The filing person is filing a separate Schedule 13D in his individual
    capacity on the date hereof.

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Fidutech Technologies, Inc.

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/(4)
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                0
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  1,659,792
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  0
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  1,659,792
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     1,659,792
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     5.7%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     CO
- -------------------------------------------------------------------------------

- ------------------------
(4) The filing person is filing a separate Schedule 13D in its individual
    capacity on the date hereof.

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Nicolas Matossian

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                446,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  204,000
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  446,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  204,000
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     650,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     2.2%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Greyhorse Resources (Canada) Ltd.

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                0
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  204,000
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  0
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  204,000
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     204,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .7%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     CO
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Chris Theodoropoulos

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                245,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  245,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     245,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .8%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Olivier Despres

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                  / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                175,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  175,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     175,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .6%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     J. Arthur Gelinas

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                  / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                220,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  220,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     220,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .8%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Robert Chartier

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                  / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                130,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  130,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     130,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .4%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Jacques Delorme

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                146,868
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  5,000
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  146,868
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  5,000
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     151,868
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .5%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Servidel Inc.

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                0
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  5,000
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  0
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  5,000
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     5,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                           / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .02%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     CO
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Vitold Jordan

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                70,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  70,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     70,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                           /X/
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .2%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Ted Shtym

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                70,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  70,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     70,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .2%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Rosalba Nespeca

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                  / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                35,500
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  35,500
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     35,500
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                           / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .1%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Micheline Prud'homme

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                105,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  105,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     105,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .4%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No.: 0002571921

- -------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSONS  
     SS OR IRS IDENTIFICATION NOS. OF ABOVE PERSONS
     Rene Amyot

- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER     (a)  /X/
     OF A GROUP                                (b)  / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY

- -------------------------------------------------------------------------------
 (4) SOURCE OF FUNDS 
     OO
- -------------------------------------------------------------------------------
 (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                   / /
- -------------------------------------------------------------------------------
 (6) CITIZENSHIP OR PLACE OF ORGANIZATION
     Canada
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (7) SOLE VOTING POWER
BENEFICIALLY OWNED                100,000
 BY EACH REPORTING           --------------------------------------------------
   PERSON WITH                (8) SHARED VOTING POWER
                                  0
                             --------------------------------------------------
                              (9) SOLE DISPOSITIVE POWER
                                  100,000
                             --------------------------------------------------
                             (10) SHARED DISPOSITIVE POWER
                                  0
- -------------------------------------------------------------------------------
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     100,000
- -------------------------------------------------------------------------------
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                           / /
- -------------------------------------------------------------------------------
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
     .3%
- -------------------------------------------------------------------------------
(14) TYPE OF REPORTING PERSON
     IN
- -------------------------------------------------------------------------------


<PAGE>

ITEM 1.  SECURITY AND ISSUER.

    This statement relates to the Class A Common Stock, par value $.001 per
share (the "Common Stock"), issued by Dominion Bridge Corporation, a Delaware
corporation (the "Company"), with principal executive offices located at 500
Notre Dame Street, 3rd Floor, Lachine, Quebec  CANADA H8S 2B2.

ITEM 2.  IDENTITY AND BACKGROUND.

    (a)  This statement is filed by Deere Park Equities, L.L.C., an Illinois 
limited liability company (the "LLC"); Douglas A. Gerrard, an individual of 
United States citizenship who is a Class A Member and the managing member of 
the LLC ("Gerrard"); STG Investments, Ltd., a Liberian corporation which is a 
non-managing Class C Member of the LLC ("STG"); Leonard Feldman, an 
individual of United States citizenship ("Feldman"); Michel L. Marengere, an 
individual of Canadian citizenship ("Marengere"); Fidutech Technologies, 
Inc., a Canadian corporation ("FTI"); Nicolas Matossian, an individual of 
Canadian citizenship ("Matossian"); Greyhorse Resources (Canada) Ltd., a 
Canadian corporation ("Greyhorse"); Chris Theodoropoulos, an individual of 
Canadian citizenship ("Theodoropoulos"); Olivier Despres, an individual of 
Canadian citizenship ("Despres"); J. Arthur Gelinas, an individual of 
Canadian citizenship ("Gelinas"); Robert Chartier, an individual of Canadian 
citizenship ("Chartier"); Jacques Delorme, an individual of Canadian 
citizenship ("Delorme"); Servidel Inc., a Canadian corporation ("Servidel"); 
Vitold Jordan, an individual of Canadian citizenship ("Jordan"); Ted Shtym, 
an individual of Canadian citizenship ("Shtym"); Rosalba Nespeca, an 
individual of Canadian citizenship ("Nespeca"); Micheline Prud'homme, an 
individual of Canadian citizenship ("Prud'homme"); and Rene Amyot, an 
individual of Canadian citizenship ("Amyot").  The controlling person of STG 
is Consolidated Nominees Limited, a British Virgin Islands company 
("Consolidated Nominees").  Information required by this Item 2 with respect 
to the executive officers and directors of STG is set forth on Schedule A 
hereto.  Marengere is the sole executive officer and director, and the 
controlling shareholder, of FTI.  Amyot is a minority shareholder of FTI.  
Matossian is the sole executive officer, director and shareholder of 
Greyhorse.  Delorme is the sole executive officer, director and shareholder 
of Servidel.  The LLC, Gerrard, STG, Feldman, Marengere, FTI, Matossian, 
Greyhorse, Theodoropoulos, Despres, Gelinas, Chartier, Delorme, Servidel, 
Jordan, Shtym, Nespeca, Prud'homme and Amyot are sometimes collectively 
referred to herein as the "Group" and, individually, as "Group Members."  Any 
disclosures herein with respect to persons other than Group Members are made 
on information and belief after making inquiry to the appropriate party.

    This Statement is also filed by each of the LLC and Gerrard in their
individual capacities.

    (b)  The address of the LLC, and the business address of Gerrard and 
Feldman is Deere Park Equities, L.L.C., 650 Dundee Road, Suite 460, 
Northbrook, IL  60062.  The address of STG is 80 Broad Street, Monrovia, 
Liberia. The address of Consolidated Nominees is Road Town, Tortola, British 
Virgin Islands.  The business address of Marengere, FTI, Matossian, 
Greyhorse, Theodoropoulos, Despres, Gelinas, Chartier, Delorme, Jordan, 
Shtym, Nespeca, Prud'homme and Amyot is c/o Dominion Bridge Corporation, 500 
Notre Dame Street, 3rd Floor, Lachine, Quebec  CANADA 

<PAGE>

H8S 2B2.  The address of Servidel is 142 Abbott Avenue, Suite 100, Westmount 
CANADA H37 2H9.

    (c)  The LLC is a registered broker-dealer engaged in the investment
business.  Gerrard's principal occupation is investment management.  The
principal business of STG is investment consulting.  Consolidated Nominees is a
nominee company.  Feldman is a consultant.  Marengere, Matossian,
Theodoropoulos, Despres, Gelinas, Chartier, Delorme, Jordan, Shtym and Nespeca
are all principally engaged as officers and/or employees and, in the case of
Marengere and Matossian, as directors, of the Company.  Amyot is also a director
of the Company and is engaged in the practice of law.  The principal business of
each of FTI and Servidel is investing in securities.  The principal business of
Greyhorse is investing in securities and holding oil and gas interests.

    (d)  Neither any of the Group Members, nor Consolidated Nominees nor any
person listed on Schedule A hereto has, during the last five years, been
convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors).

    (e)  Neither any of the Group Members, nor Consolidated Nominees nor any
person listed on Schedule A hereto has, during the last five years, been a party
to a civil proceeding of a judicial or administrative body of competent
jurisdiction and as a result of such proceeding was or is subject to a judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to, federal or state securities laws or finding any
violation with respect to such laws.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

    The source and amount of funds used by the LLC and Gerrard in acquiring the
2,110,100 shares of Common Stock beneficially owned by each of them, and by the
Group in acquiring the, 6,547,260 shares of Common Stock beneficially owned by
it, is as follows:

    Pursuant to the terms of an Operating Agreement, dated as of December 1,
1995, between the LLC and Gerrard (the "Operating Agreement"), a copy of which
is attached hereto as Exhibit 1 and incorporated herein by reference,
third-party investors may be admitted as Class C Members of the LLC from time to
time.  On August 7, 1997, STG made a capital contribution to the LLC in the form
of equity securities of a publicly-traded corporation and, in connection
therewith, entered into an Admission Agreement, dated as of August 7, 1997,
between the LLC and STG (the "Admission Agreement"), a copy of which is attached
hereto as Exhibit 2 and incorporated herein by reference, pursuant to which STG
was admitted to the LLC as a Class C Member.  The LLC, using credit made
available to it by its clearing firm, supported by the additional capital
contributed by STG, then purchased an aggregate of 1,850,000 shares of the
Company's Common Stock from certain institutional holders in a private
transaction at a price of $2.015 per share (the "Privately Purchased Shares").


<PAGE>

    In addition, between August 1, 1997 and the date hereof, the LLC, using its
working capital, acquired 260,100 shares of Common Stock in the open market at
an aggregate purchase price of $466,563.49 (the "Market Shares").  See Item 5(c)
hereof.

    Under the Operating Agreement, as supplemented by the Admission Agreement,
STG will be allocated two-thirds of the profits, subject to certain adjustments,
and all of the losses derived by the LLC from the Privately Purchased Shares but
none of the profits or losses derived by the LLC from the Market Shares. 
Gerrard, as the Class A Member of the LLC, will be allocated one-third of the
profits but none of the losses derived by the LLC from the Privately Purchased
Shares and all of the profits and losses derived by the LLC from the Market
Shares.

    Under the Operating Agreement, as supplemented by the Admission Agreement,
STG, as a Class C Member, does not have the right to direct either the voting or
the disposition of the Company's Common Stock held by the LLC.  As a
consequence, neither STG, Consolidated Nominees or any person listed on Schedule
A hereto beneficially owns any shares of the Company's Common Stock.


    Each of the following Group Members was granted options to purchase the
number of shares of Common Stock set forth opposite his or her name by the
Company in consideration for his or her employment with the Company:

    Marengere            825,000
    Matossian            400,000
    Theodoropoulos       225,000
    Despres              175,000
    Gelinas              200,000
    Chartier             110,000
    Delorme              120,000
    Jordan                50,000
    Shtym                 50,000
    Nespeca               20,000
    Prud'homme           105,000
    
In addition, Amyot was granted options to purchase 100,000 shares of Common
Stock by the Company in consideration for his services as the Company's attorney
and as a director of the Company.

    Marengere acquired 1,659,792 of the shares of Common Stock beneficially
owned by him, as the controlling shareholder of FTI, as follows:  On June 25,
1993, after filing for bankruptcy the prior year, the Company filed with the
bankruptcy court an amended plan of reorganization (the "Plan of
Reorganization").  The Plan of Reorganization included an agreement (the "Edinov
Agreement") between the Company and Edinov Corporation, a Canadian corporation,
the capital stock of which was publicly traded in Canada ("Edinov").  The Edinov
Agreement stipulated that, upon the date of effectiveness of the Plan of
Reorganization and pursuant to a Plan of Arrangement under the Business
Corporations Act of Canada, the 


<PAGE>

Company would issue shares of its Common Stock to the shareholders of Edinov in
exchange for all outstanding shares of Edinov's capital stock. On 
September 30, 1993, the Plan of Reorganization became effective, and FTI, as a 
shareholder of Edinov, received 1,659,792 shares of the Company's Common Stock.

    The following Group Members purchased or otherwise acquired the number of
shares of Common Stock set forth below opposite their names at various times
during the course of their employment with the Company.  No such purchases were
made during the past 60 days except as set forth on Schedule B hereto.

    Matossian             46,000
    Greyhorse            204,000
    Theodoropoulos        20,000
    Gelinas               20,000
    Chartier              20,000
    Delorme               26,868
    Servidel               5,000
    Jordan                20,000
    Shtym                 20,000
    Nespeca               15,500

ITEM 4.  PURPOSE OF TRANSACTION.

    Each of the Group Members acquired his, her or its shares of Common Stock 
for investment purposes.  The Group was subsequently formed by the Group 
Members with the intention of combining the holders of a significant minority 
interest in the Company so as to attempt to cohesively exercise greater 
influence over the policies and direction of the Company and implement 
management's strategic plan for the Company.  The Group Members intend to 
continually assess the market for the Common Stock, as well as the Company's 
financial position and operations.  None of the Group Members has any plans 
to acquire additional shares of Common Stock at the present time, but they 
may determine to acquire additional shares in the future depending on, among 
other things, the prevailing market price of the Common Stock and their 
assessment of the Company's business and prospects.  The Group Members may 
also determine, from time to time or at any time, to sell or otherwise 
dispose of some or all of the Common Stock, depending on the same factors.  
In making any such determination, the Group Members will consider their goals 
and objectives, other business opportunities available to them, as well as 
general economic and stock market conditions.  The foregoing actions may be 
taken by one or more of the Group Members and, while currently there are no 
plans to do so, possibly in combination with others.

    The Company's management, consisting of Marengere, Matossian, 
Theodoropoulos, Despres, Gelinas, Chartier, Delorme, Jordan, Shtym and 
Nespeca (collectively, "Management"), is currently involved in a proxy 
contest for control of the Company with the Committee to Revitalize Dominion 
Bridge Corporation, consisting of certain shareholders of the Company (the 
"Committee," no member of which is a Group Member).  Commencing during the 
summer of 1997, Marengere began investigating arrangements through which 
Management could seek to (i) increase

<PAGE>

its equity ownership in the Company, including, without limitation, through 
the exercise of options held by management which would have the added benefit 
of contributing working capital to the Company, (ii) obtain additional 
capital for the Company and (iii) expand its influence on the direction and 
policies of the Company.  On various dates throughout the month of August 
1997, Gerrard and representatives of STG engaged in discussions with 
representatives of Management and the Committee, with a view to assessing the 
respective positions of Management and the Committee.  Such efforts by 
Management and discussions between Gerrard and representatives of STG 
resulted in a Letter Agreement (the "Letter Agreement"), dated August 19, 
1997, among the LLC, Marengere and Matossian (the "Executive Shareholders"), 
a copy of which is attached hereto as Exhibit 3 and incorporated herein by 
reference.  

    Pursuant to the terms of the Letter Agreement, the LLC will contribute 
the Privately Purchased Shares and the Market Shares to a newly-formed 
partnership or similar entity ("Newco").  The LLC will lend to the Executive 
Shareholders an aggregate amount of $4,760,000, subject to the appointment of 
two nominees designated by the LLC to the Company's Board of Directors and 
certain other conditions, which amount will be allocated among Management to 
allow Management, Prud'homme and Amyot to exercise options held by them for 
2,380,000 shares of Common Stock (the "Option Shares").  The loan will be 
evidenced by a five-year promissory note to be issued by the Executive 
Shareholders to the LLC (the "Note").  When issued, the Option Shares will be 
contributed to Newco by the members of Management, and the obligations under 
the Note will be assumed by Newco.  The Note will be secured, when assigned 
to Newco, by all of the Privately Purchased Shares, the Market Shares and the 
Option Shares (collectively, the "Newco Shares") and will be subject to a 
limited recourse guaranty of the Executive Shareholders secured by a pledge 
of 500,000 additional shares owned by the Executive Shareholders (the 
"Guaranty Shares").  The Note will be payable with the Option Shares and, to 
the extent that the Option Shares are insufficient to provide for payment in 
full of the Note, with the Guaranty Shares and, to the extent of any 
remaining insufficiency, with the Privately Purchased Shares and the Market 
Shares.

    The Letter Agreement requires Management, Prud'homme and Amyot to grant 
proxies or similar rights to Newco with respect to the 2,057,160 shares of 
Common Stock currently held by Management (which amount includes the Guaranty 
Shares), and the LLC, Management, Prud'homme and Amyot to grant to Newco a 
voting proxy with respect to any additional shares of the Company's Common 
Stock acquired at any time prior to or during the existence of Newco.

    The Letter Agreement provides that Newco will be managed by Gerrard, 
Feldman, Marengere and Matossian, who will be required to vote unanimously 
with respect to the voting and, with certain exceptions, disposition of the 
Newco Shares, the voting of proxies for other shares controlled by Newco, and 
other matters concerning the business, operation and management of Newco.  
Newco will have a five-year term, subject to early termination in certain 
circumstances. Pursuant to the Letter Agreement, the Option Shares, or 
proceeds thereof, not used for payment of the Note will be allocated 30% to 
the LLC and 70% to the Executive Shareholders, and the Privately Purchased 
Shares and the Market Shares, or the proceeds thereof, not used for payment 
of the Note, will be allocated 60% to the LLC and 40% to the Executive 
Shareholders.

<PAGE>

    Except as set forth above, none of the Group Members has any plans or
proposals which relate to or would result in any of the following:

    (a)  The acquisition of additional securities of the Company, or the
disposition of securities of the Company;

    (b)  An extraordinary corporate transaction, such as a merger,
reorganization or liquidation, involving the Company;

    (c)  A sale or transfer of a material amount of assets of the Company;

    (d)  Any material change in the present capitalization or dividend policy
of the Company;

    (e)  Any other material change in the Company's business or corporate
structure;

    (f)  Changes in the Company's charter, by-laws or instruments corresponding
thereto or other actions which may impede the acquisition of control of the
Company by any person;

    (g)  A class of securities of the Company being delisted from a national
securities exchange or ceasing to be authorized to be quoted on an inter-dealer
quotation system of a registered national securities association;

    (h)  A class of equity securities of the Company becoming eligible for
termination of registration pursuant to Section 12(g)(4) of the Securities
Exchange Act of 1934 (the "Exchange Act"); or

    (i)  Any action similar to those enumerated above.

    Although, except as disclosed herein, none of the Group Members has any
plans or proposals to engage in any of the transactions specified in paragraphs
(a) through (i) of this Item 4, one or more of such persons may consider
proposing to the Company one or more acquisitions, divestitures, business
combinations, financings or other of such transactions in the future depending
upon factors including, but not limited to, developments with respect to the
proxy contest between Management and the Committee, the market for the Company's
Common Stock, the Company's prospects, alternative investment opportunities,
general economic, business and monetary conditions, as well as other factors
deemed relevant from time to time.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

    (a)  The aggregate percentage of shares of Common Stock reported owned by 
each person herein is based upon 29,052,648 shares outstanding, which is the 
total number of shares of Common Stock outstanding on August 5, 1997, as 
reported by the Company in its Form 10-Q for the period ending June 30, 1997, 
filed with the Securities and Exchange Commission on August 14, 1997.  

<PAGE>

         Each of the LLC and Gerrard beneficially owns 2,110,100 shares of
    Common Stock, representing approximately 7.3% of the number of issued and
    outstanding shares of Common Stock as of August 5, 1997.  

         The Group beneficially owns 6,547,260 shares of Common Stock,
    representing approximately 20.9% of the number of issued and outstanding
    shares of Common Stock as of August 5, 1997.  

         Marengere beneficially owns 2,484,792 shares, 825,000 shares of which
    are subject to stock options exercisable immediately, representing
    approximately 8.3% of the number of issued and outstanding shares of Common
    Stock as of August 5, 1997. This number excludes the shares owned by 
    Marengere's spouse. See Prud'homme below.

         FTI beneficially owns 1,659,792 shares, representing approximately
    5.7% of the number of issued and outstanding shares of Common Stock as of
    August 5, 1997.

         Matossian beneficially owns 650,000 shares, 400,000 shares of which
    are subject to stock options exercisable immediately, representing
    approximately 2.2% of the number of issued and outstanding shares of Common
    Stock as of August 5, 1997.

         Greyhorse beneficially owns 204,000 shares, representing approximately
    .7% of the number of issued and outstanding shares of Common Stock as of
    August 5, 1997.

         Theodoropoulos beneficially owns 245,000 shares, 225,000 shares of
    which are subject to stock options exercisable immediately, representing
    approximately .8% of the number of issued and outstanding shares of Common
    Stock as of August 5, 1997.

         Despres beneficially owns 175,000 shares, all of which are subject to
    stock options exercisable immediately, representing approximately .6% of
    the number of issued and outstanding shares of Common Stock as of August 5,
    1997.

         Gelinas beneficially owns 220,000 shares, 200,000 of which are subject
    to stock options exercisable immediately, representing approximately .8% of
    the number of issued and outstanding shares of Common Stock as of August 5,
    1997.

         Chartier beneficially owns 130,000 shares, 110,000 of which are
    subject to stock options exercisable immediately, representing
    approximately .4% of the number of issued and outstanding shares of Common
    Stock as of August 5, 1997.

         Delorme beneficially owns 151,868 shares, 120,000 of which are subject
    to stock options exercisable immediately, representing approximately .5% of
    the number of issued and outstanding shares of Common Stock as of August 5,
    1997.

         Servidel beneficially owns 5,000 shares, representing approximately
    .02% of the number of issued and outstanding shares of Common Stock as of
    August 5, 1997.


<PAGE>

         Jordan beneficially owns 70,000 shares, 50,000 of which are subject to
    stock options exercisable immediately, representing approximately .2% of
    the number of issued and outstanding shares of Common Stock as of August 5,
    1997.  Such number of shares does not include 5,000 shares owned by Nicole
    Farbier, as to which Jordan disclaims beneficial ownership.

         Shtym beneficially owns 70,000 shares, 50,000 of which are subject to
    stock options exercisable immediately, representing approximately .2% of
    the number of issued and outstanding shares of Common Stock as of August 5,
    1997.

         Nespeca beneficially owns 35,500 shares, 20,000 of which are subject
    to stock options exercisable immediately, representing approximately .2% of
    the number of issued and outstanding shares of Common Stock as of August 5,
    1997.

         Prud'homme beneficially owns 105,000 shares, all of which are subject
    to stock options exercisable immediately, representing approximately .4% of
    the number of issued and outstanding shares of Common Stock as of August 5,
    1997.

         Amyot beneficially owns 100,000 shares, all of which are subject to
    stock options exercisable immediately, representing approximately .3% of
    the number of issued and outstanding shares of Common Stock as of August 5,
    1997.

Neither STG, Consolidated Nominees, any person listed on Schedule A hereto or
Feldman beneficially owns any shares of the Company's Common Stock.

    (b)  Each of the LLC and Gerrard shares the power to vote and dispose of 
all of the shares of Common Stock beneficially owned by it or him with the 
other.  Each of Marengere and FTI shares the power to vote and dispose of the 
1,659,792 shares of Common Stock as to which they share beneficial ownership. 
Each of Matossian and Greyhorse shares the power to vote and dispose of the 
204,000 shares of Common Stock as to which they share beneficial ownership. 
Each of Delorme and Servidel shares the power to vote and dispose of the 
5,000 shares as to which they share beneficial ownership. Each of the other 
Group Members has sole power to vote and dispose of all of the shares of 
Common Stock beneficially owned by him or her.  Neither STG, Consolidated 
Nominees, any person named on Schedule A hereto or Feldman has the power to 
vote or dispose of any shares of Common Stock.

    (c)  See Schedule C attached hereto for a list of purchases and sales of
Common Stock by the LLC, Greyhorse and Jordan within the 60-day period prior to
the date hereof.

    (d)  Except as set forth in Item 4 hereof, no person other than the LLC or
Gerrard is known to have the right to receive or the power to direct the receipt
of dividends from or the proceeds from the sale of the shares of Common Stock
beneficially owned by such persons, as set forth in Item 5(a) above; no person
other than Marengere or FTI is known to have the right to 


<PAGE>

receive or the power to direct the receipt of dividends from or the proceeds
from the sale of the 1,659,792 shares of Common Stock as to which such persons
share beneficial ownership, as set forth in Item 5(a) above; no person other
than Matossian or Greyhorse is known to have the right to receive or the power
to direct the receipt of dividends from or the proceeds from the sale of the
204,000 shares of Common Stock as to which such persons share beneficial
ownership; no person other than Delorme and Servidel is known to have the right
to receive or the power to direct the receipt of dividends from or the proceeds
from the sale of the 5,000 shares of Common Stock as to which such persons share
beneficial ownership; and no person other than each remaining respective Group
Member is known to have the right to receive or the power to direct the receipt
of dividends from or the proceeds from the sale of the shares of Common Stock
owned by such Group Member, if any.

    (e)  Not applicable.

ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
TO SECURITIES OF THE ISSUER.

    Gerrard is the sole Class A Member and the managing member of the LLC, STG
is a Class C Member of the LLC and Feldman is an independent consultant for the
LLC.  Each of Marengere, Matossian, Theodoropoulos, Despres, Gelinas, Chartier,
Delorme, Jordan, Shtym and Nespeca is a member of the Company's management and
Prud'homme was formerly a member of the Company's management and is the spouse
of Marengere.  Marengere and Matossian are also directors of the Company.  Amyot
serves as a director of the Company and as its attorney.  Marengere is the sole
officer and director, and the controlling shareholder, of FTI and Amyot is a
minority shareholder of FTI.  Matossian is the sole officer, director and
shareholder of Greyhorse.  Delorme is the sole officer, director and shareholder
of Servidel.  See Item 3 hereof.  The LLC has entered into a Letter Agreement
with Marengere and Matossian with respect to the shares of Common Stock
beneficially owned by the Group.  See Item 4 hereof.

    Each of the Group Members has executed a Joint Filing Agreement, dated as
of August 18, 1997 (the "Joint Filing Agreement"), pursuant to Rule 13d-1(f) of
the Exchange Act, pursuant to which such Group Members granted a power of
attorney in favor of Gerrard to execute on their behalf this Schedule 13D and
all amendments hereto and such other documents in connection therewith, and to
file the same with the Securities and Exchange Commission on behalf of such
Group Members.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

    1.   Operating Agreement

    2.   Admission Agreement

    3.   Letter Agreement

    4.   Joint Filing Agreement


<PAGE>

                                      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.

Dated:  August 19, 1997
                                           
                                  /S/ Douglas A. Gerrard
                                      -------------------------------
                                            Douglas A. Gerrard


<PAGE>

                                                                      SCHEDULE A

                         Directors and Executive Officers of
                                           
                                STG Investments, Ltd.
                      Road Town, Tortola, British Virgin Islands

<TABLE>
<CAPTION>
 

Name                  Business Address                    Principal        Citizenship
- ----                  ----------------                    ---------        -----------
and Title                                                 Occupation
- ---------                                                 ----------
<S>                   <C>                                 <C>              <C>
Trevor J. Williams;   14 Par La Ville Road, 3rd Floor     Accountant       British
President and         Hamilton, HMJX Bermuda
Director              

J. Arthur Jones;      14 Par La Ville Road, 3rd Floor     Accountant       British
Vice President,       Hamilton, HMJX Bermuda
Treasurer and         
Director

Deborah Paterson;     14 Par La Ville Road, 3rd Floor     Administrator    British
Secretary and         Hamilton, HMJX Bermuda
Director              
</TABLE>


<PAGE>

                                                                      SCHEDULE B

                         Transactions Within the Last 60 Days
                                           
                                           
    The following shares of common stock of Dominion Bridge Corporation were
purchased by Deere Park Equities, L.L.C. within the 60 days prior to the date of
this Schedule 13D:

Date              No. Shares              Price Per Share
- ----              ----------              ---------------

8/1/97            1,000                    $1.71875
                  12,000                    1.75

8/5/97            33,500                    1.72024

8/6/97            72,500                    1.78125
                  38,700                    1.78250
                  2,000                     1.8125
                  10,000                    1.84375

8/7/97            15,000                    1.78458
                  1,850,000                 2.015

8/8/97            10,000                    1.7188

8/12/97           55,400                    1.81430

8/13/97           20,000                    1.9375


    The following shares of common stock of Dominion Bridge Corporation were
sold by Deere Park Equities, L.L.C. within the 60 days prior to the date of this
Schedule 13D:

Date              No. Shares              Price Per Share
- ----              ----------              ---------------

8/8/97            10,000                  $1.59375

    Greyhorse purchased 50,000 shares of Common Stock on June 18, 1997, at a 
price of $1.1875 per share.

    Jordan sold 18,400 shares of Common Stock on August 13, 1997, at a price of
$1.84375 per share, and purchased 18,400 shares of Common Stock on August 18,
1997, at a price of $1.9375 per share.


<PAGE>

                                    EXHIBIT INDEX
                                           
Exhibit No.        Document

       1.    Operating Agreement, dated as of December 1, 1995, between Deere
             Park Equities, L.L.C. and Douglas A. Gerrard.

       2.    Admission Agreement, dated as of August 7, 1997, between Deere
             Park Equities, L.L.C. and STG Investments, Ltd.

       3.    Letter Agreement, dated August 18, 1997, among Deere Park
             Equities, L.L.C., Michel L. Marengere and Nicolas V. Matossian.

       4.    Joint Filing Agreement, dated August 18, 1997, pursuant to Rule
             13d-1(f), including Power of Attorney granted to Douglas A.
             Gerrard to sign Schedule 13D and all amendments thereto, and to
             file the same with the Securities and Exchange Commission, and
             other documents in connection therewith, on behalf of each of the
             Group Members.



<PAGE>


                                                                EXHIBIT 1

                                 OPERATING AGREEMENT
                                           
                                          OF
                                           
                             DEERE PARK EQUITIES, L.L.C.
                                           
                                           
                                           
                                           
    This Operating Agreement of DEERE PARK EQUITIES, L.L.C., (the "Company"), 
a limited liability company organized pursuant to the Illinois Liability 
Company Act (the "Act") is entered into and shall be effective as of 
December 1, 1995 by and among the Company and the persons executing this 
Agreement (the "Company Agreement") as members.

                                      ARTICLE I
                                           
                                      FORMATION
                                           
    1.1  Organization - The Members hereby organize the Company as an 
Illinois Limited pursuant to the provisions of the Act.

    1.2  Name - The name of the Company is DEERE PARK EQUITIES, L.L.C. and 
all business of the Company shall be conducted under that name or under any 
other name designed by the Member-Managers, but in any case, only to the 
extend permitted by applicable law.

    1.3  Effective Date - The Company has been organized as an Illinois 
Limited Liability Company by executing and delivering Articles of 
Organization to the Illinois Secretary of State in accordance with and 
pursuant to the Act on December 1, 1995.

    1.4  Term - The Company shall be dissolved and its affairs wound up in 
accordance with the Act and the Company Agreement on December 31, 2020, 
unless the term shall be extended by amendment to the Company Agreement and 
the Articles of Organization, or unless the Company shall be sooner dissolved 
land its affairs would up in accordance with the Act or the Company Agreement.

    1.5  Principal Office/Registered - The Principal Office of the Company 
shall be located at 650 Dundee Road, Suite 460, Northbrook, Illinois 60062.  
The registered agent and Office of the Company shall be Allen S. Gerrard, 33 
N. Dearborn Street, Suite 1850, Chicago, IL 60602.

                                      ARTICLE II
                                           
                                  NATURE OF BUSINESS
                                           
    2.1  Business - The business of the Company shall be to profit from the 
activities of traders who trade securities primarily using electronic systems 
for order entry.  The Company 

<PAGE>


shall conduct business as a registered broker-dealer.  the Company shall 
trade securities on a proprietary basis.

    2.2  Other Business - The Company may also engage in any other lawful 
business whatsoever, including but not limited to any such business as shall 
any time appear conducive to, or expedient for, the protection or benefit of 
the Company and its assets or necessary or convenient to accomplish its 
purposes and operate its business as described in Section 2.1 hereof.

                                     ARTICLE III
                                           
                                ACCOUNTING AND RECORDS
                                           
    3.1  Records to be Maintained - The Company shall maintain at the Principal
Office all records required to be maintained by the Act.

    3.2  Reports to Members:

         A.   The Company shall provide all Members with those information
returns required by the Act, the Internal Revenue Code of 1986, as amended (the
"Code"), and applicable laws.

         B.   The Company shall make available to Members all records required
by law at such times and under such conditions required by the law.

    3.3  Accounts - The Company shall maintain a Capital Account for each
Member in accordance with Section VII.

    3.4  Accounting Method and Period - The books and records of the Company
shall be maintained on such accounting method as the Member-Managers shall
designate.  The fiscal year of the Company shall end on December 31.

                                      ARTICLE IV
                                           
                            CLASSES OF MEMBERS' INTERESTS
                                           
    4.1  Classes - The Company is authorized to have two classes of Members' 
interests ("Interests"):  Class A Interests and Class C Interests.

    4.2  Rights of Classes - The rights of each class of Interests shall be 
identical except as otherwise specifically set forth herein.

    4.3  Members' Interests' - The Members of the Company, their respective 
agreed upon initial capital contributions and the class of Interest held by 
each Member shall be as set forth on Exhibit A attached hereto and by this 
reference made a part hereof.

                                       2


<PAGE>

                                      ARTICLE V
                                           
                             RIGHTS AND DUTIES OF MEMBERS
                                           
    5.1  Voting Rights- All Members who have not dissociated shall be 
entitled to vote on any matter submitted to a vote of the Members.

    5.2  Quorum, Meetings, Consents - Members at least two-thirds of the 
outstanding Capital Interests and/or Profits Interests, represented in person 
or by proxy, (determined as of the date a meeting is called) and all Members 
who hold Class A Interests, represented in person or by proxy, shall 
constitute a quorum for a meeting of Members.  If a quorum is present, the 
affirmative vote of both (a) Members holding a majority of the Capital 
Interests and/or Profits Interest represented at such meeting and (b) Members 
holding a majority of the Class A Interest represented at such meeting shall 
be the act of Members, unless a vote of a greater or lesser proportion or 
number is otherwise required by the Act, the Articles of Organization or the 
Company Agreement.  Action required or permitted to be taken at any meeting 
of the Members may be taken without a meeting if the action is evidenced by 
written consent of all Members.

    5.3  Capital Interests - "Capital Interests" when used in this Company 
Agreement shall mean the interest of the Members in the capital of the 
Company as indicated on the books and records of the Company.  A Particular 
Member's interests in the capital of the Company shall be determined by 
comparing the balance of his Capital Account to the total of all Members 
Capital Account balances as of the date of such determination.

    5.4  Profit Interests - "Profit Interests" when used in this Company 
Agreement shall mean the interest of the Members in the profits of the 
Company as indicated on the books and records of the Company.  A particular 
Member's interests in the profits of the Company shall be determined by 
computing his percentage of profits to the total of all Members' profits as 
of the date of such determination without regard to any special allocation 
provided for in Section 8.2

    5.5  Liability of Members - No Member (as a Member) shall be liable as 
such for the liabilities of the Company.  The failure of the Company to 
observe any formalities or requirements relating to the exercise of its 
powers or management of its business or affairs under this agreement or the 
Act shall not be grounds for imposing personal liability on the Members for 
liabilities of the Company.

    5.6  Indemnification - With the approval of holders of a majority of the 
Capital Interests, excluding the Member(s) for whom indemnity is sought, the 
Company shall indemnify a Member for all costs, losses, liabilities, and 
damages paid or accrued by such Member or agent in connection with the 
business of the Company, to the fullest extent provided or allowed by the 
laws of Illinois, except as otherwise provided in the Company Agreement.


                                   3

<PAGE>

                                      ARTICLE VI
                                           
                             GOVERNANCE:  MEMBER-MANAGERS
                                           
    6.1  Designation of Member-Managers - The business and operations of the 
Company will be managed by the Member-Managers, who shall be a Member (the 
"Member-Manager").  From the inception of the Company, DOUGLAS A. GERRARD 
will serve as Member-Manager until he resigns.  After resignation of the 
Member-Manager, a new Member-Manager may be appointed only with the consent 
of both holders of a majority of the Capital or Profit Interests and all 
holders of Class A Interests.

    6.2  Authority of the Member-Manager - The Member-Manager has sole 
authority to manage the Company and is authorized, solely, to make any 
contracts, enter into any transactions, and make and obtain any commitments 
on behalf of the Company to conduct or further the Company's business.

    6.3  Nonliability and Indemnification of Member-Manager for Acts or 
Omissions in Official Capacity - The Member-Manager shall perform his duties 
as Member-Manager in good faith, in a manner he reasonably believes to be in 
the best interest of the Company, and with such care as ordinary prudent 
person in a like position would use under similar circumstances.  The 
Member-Manager shall not be liable to the Company or any Member for any loss 
or damage sustained by the Company or any Member, unless the loss or damage 
shall have been the result of fraud, deceit, gross negligence, willful 
misconduct or a wrongful taking of the Member-Manager.  The Member-Manager is 
released from liability for damages and other monetary relief to the fullest 
extent permitted by the Act.  The Company shall indemnify the Member-Manager 
for all costs, losses, liabilities and damages paid or accrued by the 
Member-Manager in connection with the business of the Company to the fullest 
extent provided by the laws of Illinois.

    6.4  No Authority of Members - Except as authorized by the 
Member-Manager, no Member is an agent of the Company or has the authority to 
make any contracts, enter into any transactions, or make any commitments on 
behalf of the Company.

    6.5  Tax Matters Partner - The Member-Manager shall served as the "Tax 
Matters Partner" for all purposes permitted under the Code.

                                     ARTICLE VII
                                           
                          CONTRIBUTIONS AND CAPITAL ACCOUNTS
                                           
    7.1  Initial Contributions - Each Member shall make the Capital 
Contribution described for that Member on Exhibit A at the time and on the 
terms specified on Exhibit A.  The value of the Capital Contributions shall 
be set forth on Exhibit A.

                                       4

<PAGE>

    7.2  Maintenance of Capital Accounts - A separate capital account 
("Capital Account") for each Member shall be established on the books of the 
Company.  The capital contribution of each Member shall be credited to such 
Member's Capital Account.  There shall be debited to each Member's Capital 
Account the amount of all distributions or returns of capital made to such 
Member and if such Member is trading the Company's proprietary account, those 
expenses relating thereto. Capital Accounts also shall be credited or debited 
with the share of profits and losses of the Company allocated to each Member 
provided in Article 8.1, and from any special allocation to such Member as 
provided in Article 8.2.  Each Member's distributive share of profits and 
losses of the Company for any taxable year shall be determined in accordance 
with Article VIII hereof.  Notwithstanding any provision of this Company 
Agreement to the contrary, the Capital Accounts of the Members shall at all 
times be maintained strictly in accordance with Treas. Reg 1.704-1(b)(2)(iv), 
as amended from time to time, and shall be adjusted as provided therein.

    7.3  Interest and Return of Capital - No Member shall be entitled to 
interest on its Capital Contribution or a return of its Capital Contribution, 
except as expressly provided herein.

    7.4  Additional Contribution - Except as provided in Articles 7.5 and 
12.2 (a) no Member shall be required to make an additional contribution and 
(b) additional capital contributions may be made by a Member only with the 
consent of the Member-Managers.

    7.5  Member-Managers - Capital Contributions - The Member-Managers, in 
the aggregate, must maintain through out the entire existence of the L.L.C. a 
minimum Capital Account balance equal to the lesser of 1% of total positive 
capital account balances of $200,000.  In addition, whenever a non-managing 
member makes a capital contribution, the Member-Managers must contribute 
immediately to the L.L.C. capital equal to 1.01% of the non-managing member's 
capital contributions or a lesser amount (including zero) that causes the sum 
of Member-Manager's Capital Account balance to equal the lesser of 1% of 
total positive capital account balance for the L.L.C. or $200,000.  Capital 
Accounts and the value of contributions are determined under the rules of 
$1.704-1(b)(2)(iv) of the Income Tax Regulations.

                                     ARTICLE VIII
                                           
                            ALLOCATIONS AND DISTRIBUTIONS
                                           
    8.1  Allocations of Net Profits and Net Losses from Operations - Net 
Profits and Net Losses of the Company shall be allocated among the Members' 
Capital Accounts as follows:

A.  NET PROFITS

    1.   CLASS C INTERESTS - Net Profits for each fiscal year shall first be
allocated to the Class C Interests to the extent of the cumulative aggregate
"Preference Return".  For this purpose the "Preference Return" for a particular
Class C Interest that was outstanding during the year, (or if less than a year
on a pro-rata basis) shall be an amount equal to (i) three percent (3%) per
annum or such other rate as designated by the Member-Managers in a written
notice mailed to 

                                 5

<PAGE>

holders of Class C Interests at least thirty (30) days prior to such new rate 
taking effect and (ii) multiplied by the average month end balance of the 
Capital Account relating to such Class C Interest during the year, as 
determined in good faith and on a consistent basis by the Member-Managers 
based on the books and records of the Company.  In addition, Class C 
Interests may receive a special allocation of profits.

    2.   Class A Interests - Net Profits remaining after the allocations 
provided for in 8.1(A)(1) shall be allocated to the Class A interests in the 
following percentage:

                                 100% Douglas Gerrard
                                           
B.     NET LOSSES

    1.   Class C Interests - A Class C Member may be allocated a loss for the 
fiscal year which results from a special allocation provided for in Article 
8.2, to the extent that there have been cumulative previous special 
allocations of profits to that Member, or to the extent of their contribution 
to their own Capital Accounts.

    2.   Class A Interests - Net Losses remaining for the fiscal year after 
the allocations provided for in Articles 8.1(B)(1) and 8.1(B)(2) shall be 
allocated to the Class A Interests in the following percentage:  100% to 
Douglas A. Gerrard.

    8.2  Special Allocations:

    A.   A Member who trades the Company's proprietary securities trading 
account will receive a special allocation, determined by the Member and the 
Member-Manager, of profit or loss based on that Member's trading results for 
the period.  In addition, there shall be no special allocation of profit, 
until or unless there are profits that exceed any previous loss which has not 
been allocated to such Member.

    B.   The Member shall have the exclusive right to select the potential 
trades, and the Member-Manager, or his designee or designees, can reject any 
selected trade and/or liquidate any securities position if he feels it is in 
the best interests of the Company.  The Member and Member-Manager will 
mutually decide which specific securities are to be traded, after considering 
the securities traded by other Members, and applicable rules and regulations. 
 In addition, all Members who trade the Company's proprietary account shall 
be subject to the Company's restrictions, risk parameters, principles of 
trading, and rules and regulations as they may be changed from time to time.  
Any breach of the above will constitute cause for involuntary dissociation as 
provided in Article 10.1(B) and (C), and/penalty, if applicable, as provided 
for in Article 10.2(B).

    8.3  Net Profits and Net Losses - "Net Profits" or "Net Losses" shall 
mean the profits or losses of the Company including without limitation each 
item of the Company income, gain, loss, deduction and credit.

                                      6

<PAGE>

    8.4   Distributions - From time to time, the Member-Manager shall
determine to what extent distributions out of profits and capital shall be made
to Members.  Distributions shall be made in cash and need not be made
proportionately among all Interests or among a class or classes of Interest.

    8.5   Tax Allocation - For federal, state and local income tax purposes,
the income, gains, losses, deductions and credits of the Company shall be
allocated among the Members in the same manner that each such item is allocated
among the Capital Accounts.

    8.6   Withholding - Each Member authorizes the Company to withhold and to 
pay over, or otherwise pay, any withholding or other taxes payable by the 
Company with respect to such Member or as a result of such member's 
participation in the Company, including but not limited to the share of the 
Company's liability for Illinois Personal Replacement Income Tax that is 
attributable to Net Profits allocated to such Member (unless the Company is 
allowed a deduction in determining such liability for the amount so 
allocated). Any such withholdings shall be deemed to be a distribution to 
such Member with respect to such Member's Interest.

    8.7   Compliance with Code - The allocations contained in this Agreement 
are intended to comply with Texas.  Reg. Section 1.704-1(b) issued pursuant 
to Section 704(b) of the Code and shall be interpreted in a manner consistent 
with such Regulations.  The Company may, by action of the Member-Manager and 
without the consent of any Member, amend the provisions of the Agreement and 
the manner in which profits and losses (or other items) are allocated to the 
extent (but only to the extent) necessary to comply with such Regulations.

                                      ARTICLE IX
                                           
                   DISPOSITION OR TRANSFER OR MEMBERSHIP INTERESTS
                                           
    10.1  Dissociation - A person all cease to be a Member upon the happening
of any of the following events ("Dissociation"):

          A.  the voluntary withdrawal of a Member prior to December 31, 2020;

          B.  a decision of the Member-Managers to remove a Class C Member;

          C.  the bankruptcy of a Member;

          D.  in the case of a Member who is a natural person, the death of the
Member or the entry of an order by a court of competent jurisdiction
adjudicating the Member incompetent to manage the Member's personal estate;

          E.  in the case of a Member that is a separate organization other
than a corporation, the dissolution and commencement of winding up of the
separate organization;

                                     7

<PAGE>

          F.  in the case of a Member that is a corporation, the filing of a
certificate of dissolution, or its equivalent, for the corporation or the
revocation of its charter; or

          G.  in the case of an estate, the distribution by the fiduciary of
the estate's entire interest in the Company;

          H.  in any case, no withdrawal may be made except after full 
compliance with Article II Rule 6(b) of the Rules of the Chicago Stock 
Exchange.

    10.2  Rights Upon Dissociation - Upon the occurrence of any of the events 
specified in Article 10.1, the Company shall distribute to such member, or 
such other person as required by  law, within 45 days of such event the 
amount of the Capital Account allocable to such former Member as determined 
by its Member-Managers as of the date of such event, in accordance with 
generally accepted accounting principles.

          A.  The Member-Manager may require, if there exists a liability or
contingent liability pertaining to that member, a reserve to satisfy that
liability or contingent liability.  The dissociating Member consents to such a
reserve.  The reserve will be released upon the resolution of the liability of
contingent liability or after a reasonable time during which the contingent
liability does not occur.

          B.  Upon dissociation of a Member who in accordance with Article 
8.2(A)(B), has traded the Company's proprietary account, and who the 
Member-Manger, in his sole discretion, have determined has breached any of 
the provisions of Article 8.2(B), is required to pay a penalty to the Company 
of an amount, as determined by the Member-Manager, not to exceed the 
difference between the basis for the allocation of Net Losses after 
allocations of profit provided for in Article 8.2(A) and that which was 
actually allocated in Article 8.1(B)(1)(2) (cumulative net trading loss).

                                      ARTICLE XI
                                           
                           ADMISSION OF ADDITIONAL EXPENSES
                                           
    11.1  Admission of Additional Members - The Member-Manager may permit the
admission of additional Class C Members and determine the Capital Contributions
required of such Members.

    11.2  Admission of Other Members - Additional Class A and Class B Members,
other than Class B Members who become such by reason of the conversion of Class
C Interests pursuant to Article 4.3 hereof, may be admitted only with the
consent of all holders of Class A Interests.

                                         8

<PAGE>

                                     ARTICLE XII
                                           
                              DISSOLUTION AND WINDING UP
                                           
    12.1  Dissolution - The Company shall be dissolved and its affairs would
up upon:

          A.  the death, insanity, bankruptcy, retirement, resignation, or 
expulsion of any Member-Manager unless within 90 days after such dissolution 
a majority-in-interest (as determined in accordance with Rev. Proc. 94-96, 
1994-28 I.R.B. 129) of the remaining Members consent to continue.

          B.  the expiration of the Term, unless the business of the Company 
is continued with the consent of both (a) Members holding a majority of the 
Capital Interests and/or Profits Interests and (b) all holders of Class A 
Interests.

          C.  the written consent of both (a) Members holding a majority of 
the Capital Interests and (b) all holders of Class A Interests to dissolve.

    12.2  Liquidation - Upon the occurrence of a Dissolution event, the 
Member-Manager or authorized liquidating trustees of the Company shall 
commence to wind up the Company's affairs and liquidate its assets.  Unless 
otherwise required by law, the assets of the Company shall be applied as 
follows:  first, to the payment of any debts and obligations of the company; 
second, to the establishment of any reserves determined to be necessary by 
the Member-Manager or liquidating trustees; and third, to the Members to the 
extent of the balance in each Member's Capital Account and in proportion to 
the positive balances of such Capital Accounts.  Upon liquidation, any Member 
with a deficit Capital Account balance is required to make a capital 
contribution to the Company equal to that deficit balance.

                                     ARTICLE XIII
                                           
                                      AMENDMENT
                                           
    13.1  Amendment or Modification or Operating Agreement - Except for 
Articles 8.7 and 14.8, this Agreement may be amended or modified from time to 
time only by a written instrument adopted by both (a) holders of a majority 
of the Capital Interests and/or Profits Interests and (b) all holders of 
Class A Interests.

                                     ARTICLE XIV
                                           
                               MISCELLANEOUS PROVISIONS
                                           
    14.1  No Partnership Intended for Nontax Purposes - The Members have
formed the Company under the Act, and expressly do not intend hereby to form a
partnership under either the Illinois Uniform Partnership Act nor the Illinois
Revised Uniform Limited Partnership Act.  The Members do not intend to be
partners one to another, or partners as to any third party.  To 

                                           9

<PAGE>

the extent any member, by word or action, represents to another person that 
any other Member is a partner or that the Company is a partnership, the 
Member making such wrongful representation shall be liable to any other 
Member who incurs personal liability by reason of such wrongful 
representation.

    14.2  Application of Illinois Law - This Company Agreement and its 
interpretation shall be governed exclusively by its terms and by the laws of 
the State of Illinois, and specifically the Act.

    14.3  Waivers - The failure of any party to seek redress for default of 
or to insist upon the strict performance of any covenant or condition of this 
Company Agreement shall not prevent a subsequent act, which would have 
originally constituted a default, from having the effect of an original 
default.

    14.4  Severability - If any provision of this Company Agreement or the 
application thereof to any person or circumstances shall be invalid, illegal 
or unenforceable to any extent, the remainder of this Company Agreement and 
the application thereof shall not be affected and shall be enforceable to the 
fullest extent permitted by law.

    14.5  Non-Solicitation After Dissociation - Each Member hereby agrees 
that in the event of such Member's dissociation from the Company, whether 
voluntary or otherwise, he or she shall not, for a period of 18 months after 
dissociation, either directly or indirectly, on behalf of himself or herself 
or another party, offer employment, or any other financial association, or 
solicit any employee, Member or customer of the company.  In addition, each 
Member agrees since he or she may be in receipt of proprietary information 
relative to the Company's trading techniques and procedures, that any use of 
such information for any purpose other than the dissociating Member's own use 
would cause irreparable injury to the Company.

          Each Member hereby declares that the foregoing provisions are
necessary and reasonable to protect the business of the company and in addition
to all remedies available by law, the Company shall be entitled to equitable
relief, including injunctive relief of all damages arising from such breach.

    14.6  Arbitration - Any controversy, claim or dispute arising out of or 
relating to this Company Agreement, or the interpretation or breach thereof, 
or any dispute between the Member and company relating to a Member's 
affiliation with the Company or of the relationship between the Member and 
Company, including but not limited to claims arising under the Americans with 
Disabilities Act, Title VII of the Civil Rights Act of 1964, the Age 
Discrimination Employment Act, the Civil Rights Act of 1866 (42 USC Section 
1981) or other applicable local, state or federal civil rights laws or 
ordinances, shall be settled by arbitration in a location determined by the 
Company in accordance with the laws of the National Association of Securities 
Dealers, Inc. and judgment upon the award rendered by the arbitrator(s) may 
be entered in any court having jurisdiction thereof.

                                          10

<PAGE>

    14.7    Compliance with Applicable Law - The Operating Agreement of DEERE 
PARK EQUITIES, L.L.C. is intended to comply with all present applicable laws, 
including but not limited to, the Illinois Limited Liability Company Act, and 
Internal Revenue Service Revenue Procedure 95-10 (26 CFR 601, 201 Part 1, 
Section 7701, 301, 7701-2, 301, 7701-3) issued December 25, 1994.  The 
Company may, by action of the Member-Manager and without the consent of any 
Member, amend the provisions of this Agreement to further comply (but only to 
comply) with any new rulings that the Company may become aware of regarding 
Limited Liability Companies.

    14.8    Heirs, Successors and Assigns - Each and all of the covenants, 
terms, provisions, and agreements herein contained shall be binding upon and 
inure to the benefit of the parties hereto and, to the extent permitted by 
this Company Agreement, their respective heirs, legal representatives, 
successors and assigns.

    14.9    Creditors - None of the provisions of this Company Agreement 
shall be for the benefit of or enforceable by any creditors of the Company.

    14.10   Attorney-in-Fact - Each of the Members does hereby constitute and 
appoint Allen S. Gerrard as such Member's true and lawful representation and 
attorney-in-fact, in its name, place and stead to make, execute, sign and 
file all such instruments, documents and certificates which may from time to 
time be required by the laws of the United States of America, the State of 
Illinois or any other state in which the Company shall determine to do 
business, or any political subdivision or agency thereof, to be effective, 
implement and continue the valid existence of the Company.

    14.11   Counterparts - This Company Agreement may be executed in 
counterparts, each of which shall be deemed an original but all of which 
shall constitute one and the same instrument.

    IN WITNESS WHEREOF, I have hereunto set my hand and seal on the date set 
forth beside my name.

CLASS A MEMBER


_______________________________________       ________________________
DOUGLAS A. GERRARD                                    Date

                                     11

<PAGE>

                                      EXHIBIT A
                                           

                                            PERCENTAGE OF OWNERSHIP
                                            ------------------------
DOUGLAS A. GERRARD                               100%


CAPITAL CONTRIBUTIONS:
- ----------------------
Cash               $250,000.00

Equipment            50,000.00

IOM Seat            250,000.00
                    __________

TOTAL              $550,000.00





                                          12

<PAGE>
                                                                     EXHIBIT 2

                               ADMISSION AGREEMENT

     THIS ADMISSION AGREEMENT (the "Agreement") is entered into as of the 7th
day of August, 1997, by and between STG INVESTMENTS, LTD., a Liberian
corporation ("Investor"), and Deere Park Equities, L.L.C., an Illinois limited
liability company ("Company").

                                    RECITALS

     WHEREAS, Company is governed by an Operating Agreement dated December 1,
1995 (the "Operating Agreement"); and

     WHEREAS, Investor desires to become, and Company desires that Investor
become, a member of Company upon the terms and conditions contained herein.

     NOW, THEREFORE, in consideration of the recitals and mutual premises
contained herein, and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties hereto agree as
follows:

     1.   DEFINITIONS.  Capitalized terms used and not otherwise defined herein
shall have the meaning ascribed to such terms in the Operating Agreement.

     2.   ADMISSION OF INVESTOR.  Upon Investor's payment of the capital
contribution set forth in paragraph 3, Investor shall be admitted to Company as
a Class C Member, and Investor agrees to be bound by all of the terms and
conditions of the Operating Agreement with respect to Class C Members, as
supplemented by this Agreement.  Exhibit A to the Operating Agreement shall be
deemed amended to reflect the admission of and the capital contribution made by
Investor to Company.

     3.   CAPITAL CONTRIBUTION.  Contemporaneously with the execution of this
Agreement, Investor shall make a contribution to the capital of Company in the
form of Five Hundred Thousand (500,000) shares of the common stock, without par
value, of American Eco Corporation (the "American Eco Shares").  Withdrawals of
the American Eco Shares or substitutions of cash or other securities for any or
all of the American Eco Shares may be made only upon the consent of the Class A
Member.  The American Eco Shares or any cash or other securities substituted
therefor shall be deemed capital of Company, for use in its business and subject
to the risks of its operations.

     4.   DBC INVESTMENTS.

          (a)  INITIAL INVESTMENTS.  Upon Investor's admission to Company,
     Company shall purchase 1,850,000 shares of Class A Common Stock, $0.001 par
     value per share ("DBC Common Stock"), of Dominion Bridge Corporation, a
     Delaware corporation ("DBC") (such purchase being hereinafter referred to
     as the "Initial Investment").

<PAGE>

     (b)  SPECIAL INVESTMENTS.  It is understood that, following the
Initial Investment, Company may have discussions with third parties who
also own or desire to acquire shares of DBC, including without limitation
members of DBC management or dissident shareholders, and may enter into
business arrangements with such parties with respect to such shares (such
arrangements being hereinafter referred to as "Special Investments").

     (c)  OPEN MARKET INVESTMENTS.  It is also understood that Company may
use its own funds to make additional purchases of DBC Common Stock in the
open market (such purchases being hereinafter referred to as "Open Market
Investments").

5.   SPECIAL ALLOCATION OF PROFITS AND LOSSES.

     (a)  INITIAL INVESTMENT.

               (i)  Any Net Profits of Company resulting from the Initial
          Investment shall be allocated (i) first, to the extent of
          aggregate Net Losses allocated pursuant to paragraph 5(a)(ii) and
          not previously offset by this paragraph 5(a)(i), to Investor;
          (ii) second, two-thirds (2/3) to Investor and one-third (1/3) to
          the Class A Member; and

               (ii) Any Net Losses of Company resulting from the Initial
          Investment shall be allocated one hundred percent (100%) to
          Investor;
          
     provided, however, that there shall be deducted from the allocation to
     Investor, the amount of interest accrued or paid by Company to fund
     the Initial Investment.

     (b)  SPECIAL INVESTMENTS.

               (i)  Any Net Profits of Company resulting from Special
          Investments shall be allocated (i) first, to the extent of
          aggregate Net Losses allocated pursuant to paragraph 5(b)(ii) and
          not previously offset by this paragraph 5(b)(i), to Investor;
          (ii) second, five-sixths (5/6) to Investor and one-sixth (1/6) to
          the Class A Member; and

               (ii) Any Net Losses of Company resulting from Special
          Investments shall be allocated one hundred percent (100%) to
          Investor.
          
     (c)  OPEN MARKET INVESTMENTS.  Investor shall not have any interest in
Net Profits or Net Losses resulting from Open Market Investments, which
shall be allocated 100% to the Class A Member.

     (d)  NO PREFERENCE RETURN. Notwithstanding anything to the contrary in
the Operating Agreement, Investor hereby acknowledges and agrees that it
will not be entitled to any Preference Return or have any interest in
profits or losses derived from any activities or investments of Company
other than as described herein.

                                      -2-

<PAGE>

     6.   REIMBURSEMENT OF LEGAL FEES AND EXPENSES.  Investor shall promptly
reimburse Company for any and all legal fees and expenses, up to an amount of
Twenty Thousand and No/100ths Dollars ($20,000.00), of Ungaretti & Harris
incurred by Company with respect to Investor's investment of capital in and
admission to Company, the Initial Investment and any Special Investments.

     7.   RIGHTS WITH RESPECT TO DOMINION STOCK.  Investor hereby acknowledges
that Company shall have all voting and other rights with respect to the DBC
Common Stock and that Investor's only interest in such stock is as a member of
Company.

     8.   ENTIRE AGREEMENT.  This Agreement and the Operating Agreement together
contain the entire agreement and understanding of the parties with respect to
the subject matter hereof, and no representations, promises, agreements or
understandings regarding the subject matter hereof shall be of any force or
effect unless in writing, executed by the parties and dated subsequent to the
date hereof.  In the event of any conflict between the provisions of this
Agreement and the Operating Agreement, the provisions of this Agreement shall
control.

     9.   GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of Illinois without regard to conflict of
law principles thereof.

     10.  SEVERABILITY.  If any provision of this Agreement shall be held
invalid or unenforceable, the remainder nevertheless shall remain in full force
and effect.  If any provision is held invalid or unenforceable with respect to
particular circumstances, it nevertheless shall remain in full force and effect
in all other circumstances.

     11.  MODIFICATIONS AND WAIVERS.  No change, modification or waiver of any
provision of this Agreement shall be valid or binding unless it is in writing
dated subsequent to the date hereof and signed by the party intended to be
bound.  No waiver of any breach, term or condition of this Agreement by either
party shall constitute a subsequent waiver of the same or any other breach, term
or condition.

     12.  COUNTERPARTS.  This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which taken
together shall constitute one and the same instrument.

                                      -3-

<PAGE>

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


STG INVESTMENTS, LTD.,             DEERE PARK EQUITIES, L.L.C.,
a Liberian corporation             an Illinois limited liability company


By: _____________________________  By: ________________________________
                                       Doug Gerrard, Member-Manager

Its:_____________________________ 

                                      -4-



<PAGE>


                                                                      EXHIBIT 3

                             DEERE PARK EQUITIES, L.L.C.
                              650 DUNDEE ROAD, SUITE 640
                              NORTHBROOK, ILLINOIS 60062
                                           
                                           

August 19, 1997


Mr. Michel L. Marengere
Mr. Nicolas V. Matossian
c/o Dominion Bridge Corporation
500 Notre Dame
Lachine (Quebec) CANADA H8S 2B2

Gentlemen:

The purpose of this letter is to set forth our agreement with respect to a
transaction involving certain shares of common stock, par value $0.001 per share
(the "DBC Common Stock"), in Dominion Bridge Corporation, a Delaware corporation
("DBC"), now owned by Deere Park Equities, L.L.C., an Illinois limited liability
company ("Deere Park"), and now owned or to be acquired by Michel L. Marengere
("Marengere"), Nicolas V. Matossian ("Matossian"), Chris Theodoropoulos
("Theodoropoulos"), Olivier Despres ("Despres"), J. Arthur Gelinas ("Gelinas"),
Robert Chartier ("Chartier"), Jacques Delorme ("Delorme"), Vitold Jordan
("Jordan"), Ted Shtym ("Shtym"), Rosalba Nespeca ("Nespeca"), Micheline
Prud'homme ("Prud'homme") and Rene Amyot ("Amyot") (collectively, the
"Management Stockholders").  Marengere and Matossian hereinafter referred to
as the "Executive Stockholders," and Deere Park and the Management Stockholders
are sometimes hereinafter referred to collectively as the "Parties."

1.  CURRENT STOCK OWNERSHIP OR ENTITLEMENTS.

    a.   DEERE PARK.  Deere Park currently owns:

         i.   1,850,000 shares of DBC Common Stock which it acquired in a
              private transaction at a purchase price of approximately $2.015
              per share on August 7, 1997 (the "Private Deere Park Shares");
              and

         ii.  260,100 shares of DBC Common Stock which it acquired in open
              market purchases (the "Market Deere Park Shares").


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 2

    b.   MANAGEMENT STOCKHOLDERS.  The Management Stockholders currently own:

         i.   a total of 2,057,160 shares of DBC Common Stock (the "Current
              Management Shares"), allocated among them as follows:


               MANAGEMENT                   NUMBER OF CURRENT
              STOCKHOLDER                   MANAGEMENT SHARES*

         Marengere                                1,659,792
         Matossian                                  250,000
         Theodoropoulos                              20,000
         Despres                                         --
         Gelinas                                     20,000
         Chartier                                    20,000
         Delorme                                     31,868
         Jordan                                      20,000
         Shtym                                       20,000
         Nespeca                                     15,500
         Prud'homme                                      --
         Amyot                                           --



                    *    Certain of the Current Management Shares are held by
                         corporations controlled by the Management Stockholders,
                         but the Management Stockholders are the beneficial
                         owners of the Shares.

               ; and

          ii.  immediately exercisable options (the "Management Options") to
               acquire an additional 2,380,000 shares of DBC Common Stock at an
               exercise price of $2.00 per share (the "Management Option
               Shares"), allocated among them as follows.


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 3


               MANAGEMENT                              NUMBER OF
              STOCKHOLDER                         MANAGEMENT OPTIONS

          Marengere                                  825,000
          Matossian                                  400,000
          Theodoropoulos                             225,000
          Despres                                    175,000
          Gelinas                                    200,000
          Chartier                                   110,000
          Delorme                                    120,000
          Jordan                                      50,000
          Shtym                                       50,000
          Nespeca                                     20,000
          Prud'homme                                 105,000
          Amyot                                      100,000

2.  FORMATION OF NEWCO

    a.   AGREEMENT TO FORM.  The Parties hereby agree to form a partnership or
         similar entity ("Newco") for the purpose of holding title to, and
         voting rights with respect to, certain of their shares of DBC Common
         Stock.  The Parties will mutually agree upon the jurisdiction of
         formation of Newco and on the terms of the definitive documents
         governing its operation (the "Newco Governing Documents"), subject to
         the approval of the form of organization by their respective tax
         advisers.

    b.   OWNERSHIP.  The owners of Newco will be Deere Park and the Executive
         Stockholders as follows: 50% to Deere Park and 50% to the Executive
         Stockholders (25% each).

    c.   CAPITAL CONTRIBUTIONS.  The owners will contribute to Newco the
         following in return for their respective ownership interests:

         i.   in the case of Deere Park, the Private Deere Park Shares and the
              Market Deere Park Shares; and


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 4


         ii.  in the case of the Executive Stockholders, upon exercise of the
              Management Options at funding of the Loan (as hereinafter
              defined), the Management Option Shares.

         The shares of DBC Common Stock contributed to Newco are hereinafter
         referred to as the "Newco Shares."

    d.   VOTING RIGHTS.  In addition:

         i.   The Management Stockholders will grant to Newco proxies or
              similar rights pursuant to which Newco will have the sole right
              to vote all of the Current Management Shares.

         ii.  Each of the Parties will grant to Newco proxies or similar rights
              pursuant to which Newco will have the sole right to vote any
              shares of DBC Common Stock that they may acquire at any time
              prior to or during the term of Newco's existence.

    e.   MANAGEMENT.  Newco will be managed by Douglas Gerrard, Leonard
         Feldman, Marengere and Matossian, who will be required to vote
         unanimously with respect to:

         i.   the voting of the Newco Shares;

         ii.  the voting of the proxies for shares of DBC Common Stock other
              than the Newco Shares;

         iii. the disposition of the Newco Shares under any circumstances other
              than an uncured default under the Note (as hereinafter defined)
              or termination of Newco; and

         iv.  all other matters respecting the business, operations and
              management of Newco.


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 5


    f.   TERM AND TERMINATION.  Newco will have a five-year term expiring
         August 31, 2002, but will terminate prior to the expiration of such
         term in the event that:

         i.   there is an uncured default under the Note;

         ii.  the average closing market price of the DBC Common Stock on
              NASDAQ for any 10 consecutive trading days is more than $5.00 per
              share, unless the management of Newco otherwise unanimously
              agrees;

         iii. a majority of the shares of DBC owned by persons other than
              Newco, Deere Park or the Management Stockholders are tendered to
              a third party; or

         iv.  the management of Newco unanimously agrees to terminate Newco.

3.  LOAN TO NEWCO.

    a.   THE LOAN.  Deere Park will lend to the Executive Stockholders the sum
         of $4,760,000 (the "Loan"), to be allocated among the Management
         Stockholders in proportion to their respective Management Options as
         set forth in paragraph 1.b. above.  Assuming prompt satisfaction of
         the conditions to funding of the loan set forth in paragraph 4 below,
         the Loan will be funded not later than 3:00 p.m. New York time on
         Wednesday, August 20, 1997. The proceeds of the Loan will be applied,
         concurrently with funding of the Loan, to fund the exercise of the
         Management Options, whereupon the Management Option Shares will
         immediately be contributed to Newco.

    b.   NOTE.  The Loan to each Executive Stockholder will be evidenced by a
         promissory note (the "Note").  Upon contribution of the Management
         Option Shares to Newco, the obligations of each Executive Stockholder
         under the Note will be assumed by Newco.  The Note will:

         i.   mature on August 31, 2002 (the "Maturity Date");


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 6


         ii.  not bear interest prior to the Maturity Date but provide for a
              default rate of interest of 12% per annum commencing on the date
              of default and continuing through the default period;

         iii. specify as events of default or acceleration any of the
              following:

              (a)  various events of bankruptcy or insolvency affecting DBC,
                   Newco, Deere Park or the Executive Stockholders;

              (b)  average closing market price of the DBC Common Stock on
                   NASDAQ for 10 consecutive trading days being less than $1.00
                   per share;

              (c)  Deere Park at any time during the term of Newco having fewer
                   than two nominees on DBC's Board of Directors other than
                   temporary vacancies by reason of death or resignation; or

              (d)  either of the Executive Stockholders being removed as a
                   director or executive officer of DBC as the result of a
                   proxy contest;

         iv.  be subject to mandatory prepayments to the extent that margin
              with respect to the Loan is less than required under Regulation T
              promulgated by the Board of Governors of the Federal Reserve
              System.

    c.   SECURITY AGREEMENT.  The Note, when assigned to Newco, will be secured
         pursuant to a pledge and security agreement (the "Security Agreement")
         pursuant to which Newco will pledge to and grant Deere Park a security
         interest in and to all of the Newco Shares.

    d.   GUARANTY.  The Note will be subject to a limited recourse guaranty by
         the Executive Stockholders (the "Guaranty"), which will be secured by
         a pledge to Deere Park of 500,000 of the Current Management Shares
         owned by them).  Liability under the Guaranty will be limited to the


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 7


         500,000 pledged shares.  The terms of the Security Agreement and the
         Guaranty will require that, in the event of an uncured default under
         the Note, the Note will be paid with Newco Shares in the manner 
         specified in paragraph 5.a. below.

4.  CONDITIONS TO FUNDING OF LOAN.  The following will be conditions to funding
    of the Loan:
    
    a.   DBC BOARD ACTION.  The Company's current Board of Directors will have:
    
         i.   taken such actions as will be necessary, in the judgment of the
              Parties and their respective counsel, to assure that none of the
              transactions contemplated hereby will:
    
              (a)  trigger the exercise of any rights granted to holders of DBC
                   Common Stock under DBC's Rights Agreement dated as of
                   November 26, 1996;
    
              (b)  trigger any "change of control" provisions contained in the
                   service agreements of DBC's executive employees or DBC's
                   stock appreciation rights plan; or
    
              (c)  be subject to the restrictions on business combinations with
                   interested stockholders imposed by Section 203 of the
                   Delaware General Corporation Law; and
    
         ii.  appointed two nominees of Deere Park to the DBC Board of
              Directors.
    
    b.   REGISTRATION OF MANAGEMENT OPTION SHARES.  Deere Park and its counsel
         will have verified that the Management Option Shares have been
         registered with the Securities and Exchange Commission on a Form
         S-3/S-8 Registration Statement and therefore may publicly be resold.
    
    c.   AUTHORITY OF EXECUTIVE STOCKHOLDERS.  Deere Park and its counsel will
         be reasonably satisfied as to the authority of the Executive
         Stockholders to contribute the Management Option Shares to Newco.


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 8


5.  PAYMENT OF THE NOTE; ALLOCATION OF GAIN.

    a.   PAYMENT OF THE NOTE.  The Note will be paid:

         i.   with the Management Option Shares; and

         ii.  if the Management Option Shares are insufficient to provide for
              payment in full of the Note:

              (a)  first, with the Current Management Shares pledged as
                   collateral security for the Guaranty; and

              (b)  then, to the extent of any remaining insufficiency, with the
                   Private Deere Park Shares and the Market Deere Park Shares. 

         Any Management Option Shares, Currrent Management Shares, Private
         Deere Park Shares or Market Deere Park Shares applied to payment of
         the Note may be either transferred "in kind" to Deere Park or sold and
         the net proceeds of sale paid to Deere Park.

    b.   ALLOCATION OF GAIN ON MANAGEMENT OPTION SHARES.  Any Management Option
         Shares (or the proceeds thereof) not used to pay the Note will be
         allocated 30% to Deere Park and 70% to the Executive Stockholders (in
         proportion to their contributions of Management Option Shares to
         Newco).

    c.   ALLOCATION OF GAIN OR PRIVATE DEERE PARK Shares.  Any Private Deere
         Park Shares and Market Deere Park Shares (or the proceeds thereof) not
         used to pay the Note will be allocated 60% to Deere Park and 40% to
         the Executive Stockholders.


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 9


    d.   IN-KIND DISTRIBUTIONS.  In the event of the termination and
         liquidation of Newco, subject to repayment of the Note, the Newco
         Shares may be distributed "in kind" to the owners of Newco in
         accordance with their respective interests in gain as described in
         paragraphs 5.b. and 5.c. above based on the current market value of
         the shares using a 10-day closing average. 
    
6.  SPECIAL COVENANTS.

    a.   OBLIGATION TO INFORM.  The Executive Stockholders agree that, at all
         times during the term of Newco while they are serving in executive or
         managerial capacities with DBC, they will keep Newco's representatives
         on the DBC Board of Directors fully informed of all material
         developments affecting DBC and its business (it being understood that
         such obligation is in no way intended to interfere with or abrogate
         the Executive Stockholders' fiduciary responsibilities to DBC and its
         other stockholders).

    b.   NO PARTICIPATION IN CERTAIN ACTIONS.  Subject to performance by the
         Management Stockholders of their obligations under this Agreement,
         Deere Park agrees, on behalf of itself and its affiliates, to the
         extent legally permissible, that it will not join in or initiate any
         shareholder's derivative lawsuit naming any of the Management
         Stockholders a defendant with respect to any actions or omissions
         occurring prior to the date hereof, or initiate any proxy contest.

    c.   NO SHORT SALES.  Deere Park agrees that during the term of the Note 
         neither it nor any of its affiliates will not effect any short sales 
         of DBC Common Stock.
    
7.  DEFINITIVE DOCUMENTATION.   The terms of this letter agreement, which is a
    binding contract on the parties,  supersede all prior agreements, whether
    written or oral, among the parties with respect to the subject matter
    hereof.  However, this letter agreement will, as soon as practicable, be
    superseded  by definitive documentation mutually satisfactory to the
    Parties and their respective


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 10


    counsel, including, without limitation, the Newco Governing Documents, the
    Note, the Security Agreement and the Guaranty.
    
8.  EXPENSES.  Each party shall be responsible for the payment of its own legal
    and other expenses related to the transaction contemplated hereby and the
    preparation of all definitive documents relating thereto.

If the foregoing correctly states our agreement, please so acknowledge and
confirm by signing this letter in the space provided below and returning it to
the undersigned.

Very truly yours,

DEERE PARK EQUITIES, L.L.C.



By:
    -------------------------
    Douglas A. Gerrard
    Managing-Member


<PAGE>

Messrs. Marengere and Matossian
Dominion Bridge Corporation
August 19, 1997
Page 11


AGREED, ACKNOWLEDGED AND CONFIRMED AS OF THE DATE WRITTEN ABOVE:


- --------------------                                  ------------------------
MICHEL L. MARENGERE                                        NICOLAS V. MATOSSIAN

<PAGE>

                                                                       EXHIBIT 4

                                      AGREEMENT
                                           
    AGREEMENT, dated as of August 18, 1997, by and between each of the persons
named on the signature pages hereto.

    WHEREAS, Deere Park Equities, L.L.C., an Illinois limited liability company
(the "LLC"), Douglas A. Gerrard, the sole Class A Member and the managing member
of the LLC ("Gerrard"), and each of the undersigned, with the exception of STG
Investments, Ltd. and Leonard Feldman (collectively, the "Management
Shareholders"), beneficially own shares (the "Shares) of common stock of
Dominion Bridge Corporation (the "Company"); and

    WHEREAS, the parties hereto constitute a "group" with respect to the
beneficial ownership of the Shares owned by the LLC, Gerrard and the Management
Shareholders for purposes of Rule 13d-1 and Schedule 13D promulgated by the
Securities and Exchange Commission (the "Commission").

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

    1.   The parties hereto shall prepare a statement containing the
information required by Schedule 13D with respect to their respective interests
in the Shares (the "Schedule 13D") and any necessary amendments thereto.  Each
party hereto shall be responsible for the completeness and accuracy concerning
him, her or it contained therein, but shall not be responsible for the
completeness and accuracy of the information concerning any other party
contained therein, except to the extent that he, she or it knows or has reason
to believe that such information is inaccurate.

    2.   Gerrard shall be designated as the person authorized to receive
notices and communications with respect to the Schedule 13D and any amendments
thereto.

    3.   Each of the undersigned hereby constitutes and appoints Douglas A.
Gerrard his or its true and lawful attorney-in-fact and agent, with full power
of substitution and resubstitution for him, her or it and in his, her or its
name, place and stead, in any and all capacities, to sign the Schedule 13D and
any amendments thereto, and other documents in connection therewith, to be filed
with the Commission, granting unto said attorney-in-fact and agent all power and
authority to do and perform each and every act requisite and necessary to be
done, as fully to all intents and purposes as he or it might or could do in
person, hereby ratifying and confirming all that said attorney-in-fact and
agent, or his substitute or substitutes, may lawfully do or cause to be done by
virtue hereof.

    4.   This Agreement may be executed in counterparts, each of which taken
together shall constitute one and the same instrument.


<PAGE>

    IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the
date first above written.

                                  DOUGLAS A. GERRARD

                                  
                                  /S/ Douglas A. Gerrard
                                  ---------------------------------------

                                  DEERE PARK EQUITIES, .L.L.C.


                                  By: /S/ Douglas A. Gerrard
                                     ------------------------------------
                                     Name:  Douglas A. Gerrard
                                     Title:  Managing Member

                                  STG INVESTMENTS, LTD.

                                  By: /S/ Deborah L. Paterson
                                      -------------------------------
                                      Name: Deborah Paterson
                                      Title: Secretary

                                  LEONARD FELDMAN


                                  /S/ Leonard Feldman
                                  ---------------------------------------

                                  MICHEL L. MARENGERE


                                  /S/ Michel L. Marengere
                                  ---------------------------------------

                                  FIDUTECH TECHNOLOGIES, INC.



                                  By: /S/ Michel L. Marengere
                                  ---------------------------------------
                                     Name:  Michel L. Marengere
                                     Title:  President


<PAGE>

                                  NICOLAS V. MATOSSIAN


                                  /S/ Nicolas V. Matossian
                                  ---------------------------------------


                                  GREYHORSE RESOURCES (CANADA) 
                                  LTD.


                                  By: /S/ Nicolas V. Matossian
                                  ---------------------------------------
                                     Name:  Nicolas V. Matossian
                                     Title:  President


                                  CHRIS THEODOROPOULOS

                                  /S/ Chris Theodoropoulos
                                  ---------------------------------------


                                  OLIVIER DESPRES

                                  /S/ Olivier Despres
                                  ---------------------------------------


                                  ARTHUR GELINAS


                                  /S/ Arthur Gelinas
                                  ---------------------------------------


                                  ROBERT CHARTIER


                                  /S/ Robert Chartier
                                  ---------------------------------------


                                  JACQUES DELORME


                                  /S/ Jacques Delorme
                                  ---------------------------------------


<PAGE>

                                  SERVIDEL INC.



                                  By: /S/ Jacques Delorme
                                     ------------------------------------
                                     Name:  Jacques Delorme
                                     Title:  President


                                  VITOLD JORDAN


                                  /S/ Vitold Jordan
                                  ---------------------------------------


                                  TED SHTYM


                                  /S/ Ted Shtym
                                  ---------------------------------------

                                  ROSALBA NESPECA


                                  /S/ Rosalba Nespeca
                                  ---------------------------------------


                                  MICHELINE PRUD'HOMME


                                  /S/ Micheline Prud'Homme
                                  ---------------------------------------


                                  RENE AMYOT


                                  /S/ Rene Amyot
                                  ---------------------------------------



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