UNIVERSAL SEISMIC ASSOCIATES INC
SC 13D/A, 1996-06-12
OIL & GAS FIELD EXPLORATION SERVICES
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13D/A

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


                       Universal Seismic Associates, Inc.
                                (Name of Issuer)


                    Common Stock, Par Value $.0001 Per Share

                         (Title of Class of Securities)


                                   913828 109

                                 (CUSIP Number)


                                Paul E. McCollam
                    c/o Resource Investors Management Company
                             600 Travis, Suite 6875
                              Houston, Texas 77002
                                 (713) 229-8800

           (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)


                                  May 31, 1996
             (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 |_|.

Check the following box if a fee is being paid with the statement |_|. (A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial ownership of less than five percent of such class.
See Rule 13d-7.)

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>
                                  SCHEDULE 13D/A


CUSIP No.  913828 109                                    Page  2  of  21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

  Resource Investors Management Company Limited Partnership          06-1148341
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                                  (a)     |_|

                                                              (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                            AF
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                            Connecticut
                            United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                      0             
           NUMBER OF             _______________________________________________
             SHARES              8        SHARED VOTING POWER
          BENEFICIALLY
            OWNED BY                          1,384,333
              EACH               _______________________________________________
           REPORTING             9        SOLE DISPOSITIVE POWER
             PERSON
              WITH                                    0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                              1,384,333
- --------------------------------------------------------------------------------

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                            1,384,333 shares
- --------------------------------------------------------------------------------

12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|
- --------------------------------------------------------------------------------

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                            24.69%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                            PN
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.    913828 109                                 Page  3  of    21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                            RIMCO Associates, Inc.                    06-1144208
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                              (a)     |_|

                                                          (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                            AF
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                            Connecticut
                            United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                       0
          NUMBER OF              _______________________________________________
           SHARES                8        SHARED VOTING POWER
        BENEFICIALLY
          OWNED BY                             1,384,333
            EACH                 _______________________________________________
          REPORTING              9        SOLE DISPOSITIVE POWER
           PERSON
            WITH                                       0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                               1,384,333
- --------------------------------------------------------------------------------

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                            1,384,333 shares
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|
- --------------------------------------------------------------------------------

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                            24.69%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                   CO
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.   913828 109                                    Page 4  of  21  Pages



1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                            RIMCO Partners, L.P.                      06-1208375
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                               (a)     |_|

                                                           (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                            WC
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
                            United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                      0
                                ________________________________________________
         NUMBER OF
           SHARES                8        SHARED VOTING POWER
        BENEFICIALLY
          OWNED BY                              284,025
            EACH                ________________________________________________
          REPORTING              9        SOLE DISPOSITIVE POWER
           PERSON
            WITH                                      0
                                ________________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                                284,025
- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                            284,025 shares
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                            5.07%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                            PN
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.    913828 109                                   Page  5 of   21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                            RIMCO Partners, L.P. II                06-1264592
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                               (a)     |_|

                                                           (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                            WC
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
                            United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER

           NUMBER OF                                    0
            SHARES               _______________________________________________
          BENEFICIALLY           8        SHARED VOTING POWER
           OWNED BY
             EACH                                 577,906
           REPORTING             _______________________________________________
            PERSON               9        SOLE DISPOSITIVE POWER
             WITH
                                                         0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                                   577,906
- --------------------------------------------------------------------------------

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
- --------------------------------------------------------------------------------
                            577,906 shares

- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                            10.31%

- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON  (See Instructions)

                            PN
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.   913828 109                                 Page   6   of   21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                            RIMCO Partners, L.P. III                06-1291935
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                               (a)     |_|

                                                           (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                            WC
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
                            United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                      0
           NUMBER OF             _______________________________________________
            SHARES               8        SHARED VOTING POWER
         BENEFICIALLY
           OWNED BY                              68,100
             EACH                _______________________________________________
           REPORTING             9        SOLE DISPOSITIVE POWER
            PERSON
             WITH                                     0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                                 68,100

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                            68,100 shares
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                            1.21%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                            PN
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.   913828 109                                   Page  7  of   21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                            RIMCO Partners, L.P. IV                 06-1327489
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                               (a)     |_|

                                                           (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                            WC
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION
                            Delaware
                            United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                    0
           NUMBER OF             _______________________________________________
            SHARES               8        SHARED VOTING POWER
          BENEFICIALLY
           OWNED BY                            454,302
             EACH                _______________________________________________
           REPORTING             9        SOLE DISPOSITIVE POWER
            PERSON
             WITH                                    0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                               454,302
- --------------------------------------------------------------------------------

11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                            454,302 shares
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                            8.10%

- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON  (See Instructions)

                            PN
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.    913828 109                                 Page   8   of  21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                    Roy V. Hood
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                               (a)     |_|

                                                           (b)     |_|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                    AF
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                   0
           NUMBER OF             _______________________________________________
            SHARES               8        SHARED VOTING POWER
         BENEFICIALLY 
           OWNED BY                        1,384,333
             EACH                _______________________________________________
           REPORTING             9        SOLE DISPOSITIVE POWER
            PERSON
             WITH                                  0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                           1,384,333

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    1,384,333 shares

- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|

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

13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    24.69%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                    IN
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.     913828 109                                  Page  9  of  21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                    Paul E. McCollam
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                               (a)     |_|

                                                           (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                    AF
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                   0
           NUMBER OF             _______________________________________________
            SHARES               8        SHARED VOTING POWER
         BENEFICIALLY
           OWNED BY                        1,384,333
             EACH                _______________________________________________
           REPORTING             9        SOLE DISPOSITIVE POWER
            PERSON
             WITH                                  0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                           1,384,333

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    1,384,333 shares
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|
- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    24.69%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                    IN
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.     913828 109                                 Page  10  of  21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                    Stephen F. Oakes
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
     (See Instructions)                                    (a)     |_|

                                                           (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                    AF
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                    0                         
           NUMBER OF             _______________________________________________
            SHARES               8        SHARED VOTING POWER
        BENEFICIALLY
           OWNED BY                         1,384,333
             EACH                _______________________________________________
          REPORTING              9        SOLE DISPOSITIVE POWER
            PERSON
             WITH                                   0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                            1,384,333

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    1,384,333 shares
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    24.69%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                    IN
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.   913828 109                                Page   11   of   21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                    David R. Whitney
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                               (a)     |_|

                                                           (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY

- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                    AF
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|

- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

              United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                     0
           NUMBER OF             _______________________________________________
            SHARES               8        SHARED VOTING POWER
         BENEFICIALLY
           OWNED BY                          1,384,333
             EACH                _______________________________________________
           REPORTING             9        SOLE DISPOSITIVE POWER
            PERSON
             WITH                                    0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                             1,384,333

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    1,384,333 shares
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    24.69%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                       IN 
- --------------------------------------------------------------------------------
<PAGE>
                                  SCHEDULE 13D/A


CUSIP No.   913828 109                                 Page  12   of  21  Pages


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                    John B. Parsons
- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
          (See Instructions)                               (a)     |_|

                                                           (b)     |x|
- --------------------------------------------------------------------------------
3         SEC USE ONLY
- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS  (See Instructions)

                    AF
- --------------------------------------------------------------------------------
5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                           |_|
- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    United States of America
- --------------------------------------------------------------------------------
                                 7        SOLE VOTING POWER
            
                                                     0
           NUMBER OF             _______________________________________________
            SHARES               8        SHARED VOTING POWER
         BENEFICIALLY
           OWNED BY                          1,384,333
             EACH                _______________________________________________
           REPORTING             9        SOLE DISPOSITIVE POWER
            PERSON
             WITH                                    0
                                 _______________________________________________
                                 10       SHARED DISPOSITIVE POWER

                                             1,384,333

- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    1,384,333 shares
- --------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
          (See Instructions)                    |_|

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                    24.69%
- --------------------------------------------------------------------------------

14        TYPE OF REPORTING PERSON  (See Instructions)

                    IN
- --------------------------------------------------------------------------------
<PAGE>
                                                           Page 13  of 21 Pages

 Item 1.  Security and Issuer

     The class of equity  securities to which this  statement  relates is Common
Stock,  par value $.0001 per share (the "Common  Stock"),  of Universal  Seismic
Associates,  Inc.,  a Delaware  corporation  (the  "Company"),  whose  principal
executive office is located at 16420 Park Ten Place,  Suite 300,  Houston, Texas
77084.

Item 2.   Identity and Background

     The  following  table  provides  certain  information  about  each  of  the
reporting persons.


                                  Citizenship or
                             State of Incorporation/  Principal Occupation
 Name and Business Address        Organization            or Employment
 -------------------------        ------------            -------------
Resource Investors Management          CT           Investment Management
  Company Limited Partnership
("RIMCO")
22 Waterville Road
Avon, CT 06001

RIMCO Associates, Inc.                 CT           General Partner of RIMCO
("Associates")
22 Waterville Road
Avon, CT 06001

RIMCO Partners, L.P.                   DEL          Investment Partnership
("RIMCO I")                                         (Energy sector securities)
600 Travis, Suite 6875
Houston, TX 77002

RIMCO Partners, L.P. II                DEL          Investment Partnership
("RIMCO II")                                        (Energy sector securities)
600 Travis, Suite 6875
Houston, TX 77002

RIMCO Partners, L.P. III               DEL          Investment Partnership
("RIMCO III")                                       (Energy sector securities)
600 Travis, Suite 6875
Houston, TX 77002

RIMCO Partners, L.P. IV                DEL          Investment Partnership
("RIMCO IV")                                        (Energy sector securities)
600 Travis, Suite 6875
Houston, TX 77002

Roy V. Hood                           USA           Managing Director of RIMCO;
22 Waterville Road                                  President and director
Avon, CT 06001                                      of Associates

Paul E. McCollam                      USA           Managing Director of RIMCO;
600 Travis, Suite 6875                              Vice President and director
Houston, TX 77002                                   of Associates

Stephen F. Oakes                      USA           Managing Director of RIMCO;
22 Waterville Road                                  Vice President of Associates
Avon, CT 06001



<PAGE>
                                                            Page 14  of 21 Pages


David R. Whitney                       USA           Managing Director of RIMCO;
22 Waterville Road                                   Vice President and director
Avon, CT 06001                                       of Associates

John B. Parsons                        USA           Director of Associates
22 Waterville Road
Avon, CT 06001

     None of the reported  persons has been  convicted in a criminal  proceeding
(excluding traffic violations or similar misdemeanors).

     None of the  reporting  persons has been during the last five years a party
to a civil  proceeding  of a judicial  or an  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  activity  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

     On  January 19,  1996,  RIMCO I,  RIMCO II,  RIMCO III  and  RIMCO IV  (the
"Limited  Partnerships"),  purchased  $3,500,000 of 10% Senior  Secured  General
Obligation  Notes (the "Notes") of the Company with 165,000 warrants to purchase
common stock exercisable  until  January 19,  2003 at an exercise price of $3.14
per share (the "Warrants").  The Warrants are in substantially the form filed as
Exhibit B to the Schedule 13D  dated January 19,  1996 filed with the Securities
and  Exchange  Commission  on  January  29,  1996 (the  "Schedule 13D")  and are
incorporated herein by reference. No additional consideration, beyond the amount
paid for the purchase of the Notes,  was paid for the  warrants.  The  following
table sets forth the consideration paid for the Notes and the number of warrants
received:

Purchaser                   Note Purchase Amount           Warrants Received
- ---------                   --------------------           -----------------
RIMCO I                           $1,225,000                      57,750
RIMCO II                           1,225,000                      57,750
RIMCO III                            140,000                       6,600
RIMCO IV                             910,000                      42,900
                                  ----------                     -------
                                  $3,500,000                     165,000

     The funds for such purchase were provided out of the working capital of the
Limited  Partnerships.  If the  warrants  are  exercised  by any of the  Limited
Partnerships,  the funds which will be used to pay the  exercise  price  thereof
will be provided from the working capital of the Limited Partnerships.

     Additionally,  on  January 19,  1996,  the Limited  Partnerships  purchased
$500,000 of 5% Convertible Notes of the Company (the "Convertible  Notes").  The
Convertible  Notes are convertible at any time prior to maturity at a conversion
price of $3.45 per share. The Convertible  Notes are in  substantially  the form
filed as Exhibit C to the Schedule 13D and are incorporated herein by reference.
The following table sets forth the consideration  paid for the Convertible Notes
and the maximum  number of shares to be  received if one hundred  percent of the
principal balances of the Notes were to be converted.



<PAGE>
                                                           Page 15  of 21 Pages

Purchaser                  Note Purchase Amount                  Shares Received
- ---------                  --------------------                  ---------------
RIMCO I                            $175,000                            50,725
RIMCO II                            175,000                            50,725
RIMCO III                            20,000                             5,797
RIMCO IV                            130,000                            37,681
                                   --------                           -------
                                   $500,000                           144,928

     The funds for the  purchase  of the Notes and the  Convertible  Notes  were
provided out of the working capital of the Limited Partnerships.

     RIMCO II, RIMCO III and RIMCO IV entered  into an agreement on  January 19,
1996, amended as of May 28, 1996, with UNEXCO,  Inc., a Delaware corporation and
wholly owned  subsidiary  of the  Company,  to acquire up to  $3,000,000  of 10%
Senior Secured Exchangeable General Obligation Notes ("Exchangeable  Notes") the
form of which is filed as Exhibit F hereto and incorporated herein by reference.
Pursuant to the Guaranty and Exchange Agreement dated as of January 19, 1996, as
amended by the First  Amendment to Guaranty and Exchange  Agreement  dated as of
May 28, 1996 (which  agreements  are  attached  hereto as Exhibits G and G-1 and
incorporated herein by reference),  upon funding of the Exchangeable Notes, each
of RIMCO  II,  RIMCO  III and  RIMCO  IV will  have the  right to  exchange  the
outstanding  principal balance of its Exchangeable Note, at an exchange price of
$3.77,  subject to  adjustment,  for shares of Common Stock of the Company.  The
following table sets forth the consideration for the Exchangeable  Notes and the
number  of  shares  exchangeable  therefor,  assuming  that the  full  aggregate
principal amount of the Exchangeable Notes is then outstanding:

Purchaser         Exchangeable Note Purchase Amount        Shares to be Received
- ---------         ---------------------------------        ---------------------
RIMCO II                       $1,650,000                        437,665
RIMCO III                         210,000                         55,703
RIMCO IV                        1,140,000                        302,387
                               ----------                        -------
                               $3,000,000                        795,755


     Effective as of May 30, 1996, RIMCO I,  RIMCO II,  and RIMCO IV,  purchased
$6,500,000 of 10% Senior Secured General  Obligation  Notes (the "New Notes") of
the Company and acquired 278,650  warrants to purchase common stock  exercisable
until  January  19,  2003 at an  exercise  price of $5.00  per  share  (the "New
Warrants").  The New Warrants are in  substantially  the form filed as Exhibit E
hereto and incorporated herein by reference. No additional consideration, beyond
the  amount  paid  for the  purchase  of the New  Notes,  was  paid  for the New
Warrants.  The  following  table sets forth the  consideration  paid for the New
Notes and the number of New Warrants received:

Purchaser             New Note Purchase Amount             New Warrants Received
- ---------             ------------------------             ---------------------
RIMCO I                       $4,095,000                           175,550
RIMCO II                         741,000                            31,766
RIMCO IV                       1,664,000                            71,334
                              ----------                           -------
                              $6,500,000                           278,650

     The  funds  for such  purchase  were  provided  on May 31,  1996 out of the
working  capital of RIMCO I,  RIMCO II,  and  RIMCO IV.  If the New Warrants are
exercised by any of RIMCO I, RIMCO II, or RIMCO IV, the funds which will be used
to pay the exercise  price thereof will be provided from the working  capital of
such limited partnerships.


<PAGE>
                                                           Page 16  of 21 Pages

Item 4.   Purpose of Transaction

     The Notes,  New  Notes,  Warrants,  New  Warrants,  Exchangeable  Notes and
Convertible  Notes were acquired for purposes of investment  for the accounts of
the  respective  limited  partnerships.  The  Warrants  and the New Warrants are
exercisable  at any  time  on or  after  January 19,  1996  and  May  28,  1996,
respectively,  and  before  the  close of  business  on  January 19,  2003;  the
Exchangeable Notes are exchangeable at any time on or after January 19, 1996 and
before the close of business on February 1, 2002; and the outstanding  principal
amounts of the Convertible  Notes are convertible at any time prior to the close
of business on February 1, 1998. Based on an ongoing evaluation of the business,
prospects  and financial  condition of the Company,  the market for and price of
the Common  Stock,  other  investment  opportunities  available to the reporting
persons,  offers for shares of Common Stock,  general  economic  conditions  and
other  future  developments,  the  reporting  persons may decide to exercise the
Warrants  or the New  Warrants,  convert the  Convertible  Notes,  exchange  the
Exchangeable  Notes,  or sell or seek the sale of all or part of the Notes,  New
Notes,  Warrants,  New Warrants,  Convertible Notes or Exchangeable Notes or the
beneficial  holdings  of  the  Common  Stock  held  by  the  respective  Limited
Partnerships.  Other than as described  in this  Item 4,  as of the date hereof,
none of the reporting persons has any plans or proposals that relate to or would
result in any of the actions listed in subparagraphs (a)-(j) of the instructions
to Item 4 of Schedule 13D with respect to the Company as the issuer.

     The Company increased its Board of Directors by one director,  such vacancy
having  been filled by the  designee  of RIMCO  pursuant to the January 19, 1996
transaction,  and has agreed to use its best efforts, subject to applicable law,
to increase the size of its Board of Directors by one additional director and to
cause the  election of an  additional  designee of RIMCO to serve as director to
fill the resulting  vacancy on the Company's Board. As long as any of the Notes,
the New Notes, the Warrants,  the New Warrants or the Convertible  Notes (or any
securities  exchanged  therefor or distributed,  issued or issuable with respect
thereto) are outstanding or the Limited Partnerships own an aggregate of 2.5% or
more of the Common  Stock,  the  Limited  Partnerships  or their  designees  are
entitled  to  designate  a total of two  persons  for  election  to the Board of
Directors of the Company.

     The foregoing  descriptions of the Warrants and the  Convertible  Notes are
qualified in their  entirety by reference to the Warrant  Agreement and the form
of  Convertible  Note,  attached  to  the  Schedul 13D  as  Exhibits  B and  C,
respectively,  and incorporated herein by reference;  the foregoing descriptions
of the  Exchangeable  Notes,  the Guaranty and Exchange  Agreement and the First
Amendment to Guaranty and Exchange  Agreement are qualified in their entirety by
reference to the form of Exchangeable  Note, the Guaranty and Exchange Agreement
and the First  Amendment to Guaranty and Exchange  Agreement  attached hereto as
Exhibits F, G and G-1,  respectively;  and the foregoing  description of the New
Warrants is qualified in its entirety by reference to the New Warrant  Agreement
attached hereto as Exhibit E.

Item 5.   Interest in Securities of the Issuer

         (a) - (b)


               
                 Number of                  Shared            Sole
                  Shares       Shared      Invest-    Sole   Invest-
               Beneficially    Voting        ment    Voting   ment
   Name           Owned *      Power*       Power*   Power*   Power*   Percent*
   ----           -------      ------       ------   -------  ------   --------

Associates       1,384,333   1,384,333   1,384,333      0       0       24.69%
RIMCO            1,384,333   1,384,333   1,384,333      0       0       24.69%
RIMCO I            284,025     284,025     284,025      0       0        5.07%
RIMCO II           577,906     577,906     577,906      0       0       10.31%
RIMCO III           68,100      68,100      68,100      0       0        1.21%
RIMCO IV           454,302     454,302     454,302      0       0        8.10%


<PAGE>
                                                           Page 17  of 21 Pages

                Number of                  Shared             Sole
                  Shares       Shared      Invest-    Sole   Invest-
               Beneficially    Voting        ment    Voting   ment
   Name           Owned *      Power*       Power*   Power*   Power*   Percent*
   ----           -------      ------       ------   -------  ------   --------
                            
Roy V. Hood      1,384,333   1,384,333   1,384,333      0       0       24.69%
Paul E. McCollam 1,384,333   1,384,333   1,384,333      0       0       24.69%
David R. Whitney 1,384,333   1,384,333   1,384,333      0       0       24.69%
John B. Parsons  1,384,333   1,384,333   1,384,333      0       0       24.69%
Stephen F. Oakes 1,384,333   1,384,333   1,384,333      0       0       24.69%

- ----------
*    As of May 31, 1996

     (c) No  transactions  by any of the  reporting  persons  other  than  those
transactions identified in Item 3 have taken place in the last 60 days.

         (d) - (e)Not applicable.

Item 6. Contracts,  Arrangements,  Understandings or Relationships With Respect
        to Securities  of the Issuer
        

     RIMCO is the managing  general  partner of RIMCO I, RIMCO II, RIMCO III and
RIMCO IV,  which own Warrants  (and,  in the case of RIMCO I, RIMCO II and RIMCO
IV, New  Warrants)  to  purchase an  aggregate  of 233,300,  89,516,  6,600  and
114,234 shares of Common Stock,  respectively.  RIMCO has a 1.00% interest (on a
profit basis) in the portfolio  securities  held by RIMCO I, RIMCO II, RIMCO III
and RIMCO IV.

     Associates is the managing general partner of RIMCO,  which is the managing
general partner of RIMCO I, RIMCO II,  RIMCO III and RIMCO IV.  Associates has a
55% interest (on a profit  basis) in RIMCO,  which,  as indicated  above,  has a
1.00% interest (on a profit basis) in the portfolio  securities held by RIMCO I,
RIMCO II, RIMCO III and RIMCO IV.

     Roy V. Hood,  Paul E.  McCollam,  David R. Whitney and Stephen F. Oakes are
managing  directors of RIMCO. Each of Roy V. Hood, Paul E. McCollam and David R.
Whitney is a shareholder  of  Associates.  Mr. Hood is a 34.5%  shareholder  and
President and a director of Associates.  Mr. McCollam is a 23.0% shareholder and
Vice  President,  Secretary  and  Treasurer  and a director of  Associates.  Mr.
Whitney  is a  23.0%  shareholder  and  a  Vice  President  and  a  director  of
Associates. Mr. Parsons is a 19.5% shareholder and a director of Associates.

     RIMCO I is a Delaware limited partnership engaged in the business of making
investments in the energy sector of the natural  resource  industry.  RIMCO I is
the record owner of a Warrant to purchase  57,750  shares of Common Stock plus a
Convertible Note  convertible into an additional  50,725 shares of Common Stock,
and a New  Warrant to purchase  175,550  shares of Common  Stock.  RIMCO I has a
combined  interest in 284,025 shares of Common Stock or 5.07% of the outstanding
Common Stock as of May 30, 1996.

     RIMCO II  is a Delaware  limited  partnership  engaged in the  business  of
making  investments  in the  energy  sector of the  natural  resource  industry.
RIMCO II is the record  owner of a Warrant to purchase  57,750  shares of Common
Stock, a Convertible Note convertible into an additional 50,725 shares of Common
Stock, an Exchangeable  Note exchangeable for 437,665 shares of Common Stock and
a New Warrant to purchase 31,766 shares of Common Stock. RIMCO II has a combined
interest in 577,906 shares of Common Stock or 10.31% of the  outstanding  Common
Stock as of May 30, 1996.

     RIMCO III  is a Delaware  limited  partnership  engaged in the  business of
making  investments  in the  energy  sector of the  natural  resource  industry.
RIMCO III is the record owner of a Warrant to purchase 6,600 shares of


<PAGE>
                                                            Page 18  of 21 Pages

Common Stock, a Convertible  Note convertible into an additional 5,797 shares of
Common Stock and an Exchangeable  Note  exchangeable for 55,703 shares of Common
Stock.  RIMCO III has a combined  interest in 68,100  shares of Common  Stock or
1.21% of the outstanding Common Stock as of May 30, 1996.

     RIMCO IV  is a Delaware  limited  partnership  engaged in the  business  of
making  investments  in the  energy  sector of the  natural  resource  industry.
RIMCO IV is the record  owner of a Warrant to purchase  42,900  shares of Common
Stock, a Convertible Note convertible into an additional 37,681 shares of Common
Stock, an Exchangeable Note exchangeable for 302,387 shares of Common Stock, and
a New Warrant to purchase 71,334 shares of Common Stock. RIMCO IV has a combined
interest in 454,302  shares of Common Stock or 8.10% of the  outstanding  Common
Stock as of May 30, 1996.

     Under a Stock Ownership and Registration  Rights Agreement  entered into as
of January 19,  1996 and filed as Exhibit D to the Schedule 13D and incorporated
herein by  reference,  amended by the First  Amendment  to Stock  Ownership  and
Registration  Rights  Agreement,  filed as Exhibit  D-1 hereto and  incorporated
herein by reference,  the Company has granted the Limited  Partnerships  certain
demand  and  "piggy  back"  registration   rights,   commencing  one  year  from
January 19,  1996,  to  register  any offer of Common  Stock held by the Limited
Partnerships,  as well as securities (if any) issued with respect thereto, under
the  Securities  Act of  1933.  The  Stock  Ownership  and  Registration  Rights
Agreement, as amended,  provides for indemnification of the Limited Partnerships
by the Company and  indemnification  of the Company by the Limited  Partnerships
under certain circumstances related to such registration rights.

     RIMCO II,  RIMCO III and RIMCO IV entered  into an agreement on January 19,
1996, amended as of May 28, 1996, with UNEXCO,  Inc., a Delaware corporation and
wholly owned  subsidiary of the Company,  to acquire  $3,000,000 of Exchangeable
Notes the form of which is filed as Exhibit F hereto and incorporated  herein by
reference.  Upon funding of the Exchangeable  Notes,  Such limited  partnerships
will  have the  right to  exchange  the  outstanding  principal  balance  of the
Exchangeable  Notes, at an exchange price of $3.77,  subject to adjustment,  for
shares of Common Stock of the Company.

     The  exercise  price and  number of shares of Common  Stock  issuable  upon
exercise of the  Warrants and the New  Warrants,  the  Conversion  Price and the
number of shares of Common Stock  issuable upon  conversion  of the  Convertible
Notes, and the exchange price and number of shares of Common Stock issuable upon
exchange of the Exchangeable Notes are subject to adjustment upon certain events
such as a reverse  stock  split or  reclassification,  merger of the  Company or
issuances of Common Stock at a price less than the  exercise  price,  conversion
price, or exchange price, as the case may be.

Item 7.   Material to be Filed as Exhibits
                                                                               
         A.     Agreement for Joint Filing on Behalf of Each Reporting Person

         B.     Warrant Agreement, including form of Warrant (filed as Exhibit B
                to the Schedule 13D and incorporated herein by reference)

         C.     Form of Convertible Note (filed as Exhibit C to the
                Schedule 13D and incorporated herein by reference)

         D.     Stock Ownership and Registration Rights Agreement among the
                the Company, UNEXCO, Inc., a wholly owned subsidiary of
                Company, and the Limited Partnerships (filed as Exhibit D
                to the Schedule 13D and incorporated herein by reference)

<PAGE>
                                                           Page 19  of 21 Pages

         D-1    First Amendment to Stock Ownership and Registration Rights
                Agreement among the Company, UNEXCO, Inc., a wholly owned
                subsidiary of the Company, and the Limited Partnerships

         E.     New Warrant Agreement, including form of New Warrant

         F.     Form of Exchangeable Note

         G.     Guaranty and Exchange Agreement

         G-1.   First Amendment to Guaranty and Exchange Agreement


<PAGE>
                                                           Page 20  of 21 Pages



                                   SIGNATURES

     After  reasonable  inquiry and to the best of the  knowledge  and belief of
each of the following  reporting  persons,  each reporting person certifies that
the information set forth in this statement is true, complete and correct.

Date: June 11, 1996

Signature:             Resource Investors Management Company
                         Limited Partnership
                       By: RIMCO Associates, Inc.,
                              Its General Partner


                       By: /s/ Paul E. McCollam
                          __________________________________
                          Name: Paul E. McCollam
                          Title:Vice President

Date: June 11, 1996

Signature:             RIMCO Associates, Inc.


                       By: /s/ Paul E. McCollam
                          __________________________________
                          Name:  Paul E. McCollam
                          Title: Vice President

Date:June 11, 1996

Signature:             RIMCO Partners, L.P.
                       By: Resource Investors Management Company
                            Limited Partnership,
                            Its General Partner
                       By: RIMCO Associates, Inc.,
                            Its General Partner


                       By: /s/ Paul E. McCollam
                          __________________________________
                          Name: Paul E. McCollam
                          Title: Vice President

Date: June 11, 1996

Signature:             RIMCO Partners, L.P. II
                       By: Resource Investors Management Company
                            Limited Partnership,
                            Its General Partner
                       By: RIMCO Associates, Inc.,
                            Its General Partner


                       By: /s/ Paul E. McCollam
                          __________________________________
                          Name: Paul E. McCollam
                          Title: Vice President


<PAGE>
                                                            Page 21  of 21 Pages

Date: June 11, 1996

Signature:             RIMCO Partners, L.P. III
                       By: Resource Investors Management Company
                            Limited Partnership,
                            Its General Partner
                       By: RIMCO Associates, Inc.,
                            Its General Partner


                       By: /s/ Paul E. McCollam
                          __________________________________
                          Name: Paul E. McCollam
                          Title: Vice President

Date: June 11, 1996

Signature:             RIMCO Partners, L.P. IV
                       By: Resource Investors Management Company
                            Limited Partnership,
                            Its General Partner
                       By: RIMCO Associates, Inc.,
                            Its General Partner


                       By: /s/ Paul E. McCollam
                          __________________________________
                          Name: Paul E. McCollam
                          Title: Vice President



Date: June 11, 1996

Signature:                /s/ Roy V. Hood
                          __________________________________
                          Roy V. Hood

Date: June 11, 1996

Signature:                /s/ Paul E. McCollam
                          __________________________________
                          Paul E. McCollam

Date: June 11, 1996

Signature:                /s/ David R. Whitney
                          __________________________________
                          David R. Whitney

Date: June 11, 1996

Signature:                /s/ Stephen F. Oakes
                          __________________________________
                          Stephen F. Oakes

Date: June 11, 1996

Signature:                /s/ John B. Parsons
                          __________________________________
                          John B. Parsons




                                                                    Exhibit A


                                    AGREEMENT

     Pursuant to Rule 13d-1(f)  under the Securities  Exchange Act of 1934, each
of  the   undersigned   hereby  agrees  to  the  filing  of  this  Statement  on
Schedule 13D/A on its behalf.

     This agreement may be signed in one or more counterparts.


                        Resource Investors Management
                         Company Limited Partnership,
                         Its General Partner
                        By: RIMCO Associates, Inc.,
                             Its General Partner


Date: June 11, 1996     By: /s/ Paul E. McCollam
                           __________________________________
                           Name: Paul E. McCollam
                           Title: Vice President



                        RIMCO Associates, Inc.


Date: June 11, 1996     By: /s/ Paul E. McCollam
                           __________________________________
                           Name: Paul E. McCollam
                           Title: Vice President


                        RIMCO Partners, L.P.
                        By: Resource Investors Management Company
                             Limited Partnership,
                             Its General Partner
                        By: RIMCO Associates, Inc.,
                             Its General Partner


Date: June 11, 1996     By: /s/ Paul E. McCollam
                           __________________________________
                           Name: Paul E. McCollam
                           Title: Vice President


                        RIMCO Partners, L.P. II
                        By: Resource Investors Management Company
                             Limited Partnership,
                             Its General Partner
                        By: RIMCO Associates, Inc.,
                             Its General Partner


Date: June 11, 1996     By: /s/ Paul E. McCollam
                           __________________________________
                           Name: Paul E. McCollam
                           Title: Vice President



<PAGE>

                        RIMCO Partners, L.P. III
                        By: Resource Investors Management Company
                             Limited Partnership,
                             Its General Partner
                        By: RIMCO Associates, Inc.,
                             Its General Partner


Date: June 11, 1996     By: /s/ Paul E. McCollam
                           __________________________________
                           Name: Paul E. McCollam
                           Title: Vice President


                        RIMCO Partners, L.P. IV
                        By: Resource Investors Management Company
                             Limited Partnership,
                             Its General Partner
                        By: RIMCO Associates, Inc.,
                             Its General Partner


Date: June 11, 1996     By: /s/ Paul E. McCollam
                           __________________________________
                           Name: Paul E. McCollam
                           Title: Vice President




Date: June 11, 1996        /s/ Roy V. Hood
                           __________________________________
                           Roy V. Hood


Date: June 11, 1996        /s/ Paul E. McCollam
                           __________________________________
                           Paul E. McCollam


Date: June 11, 1996        /s/ David R. Whitney
                           __________________________________
                           David R. Whitney


Date: June 11, 1996        /s/ Stephen F. Oakes
                           __________________________________
                          Stephen F. Oakes


Date: June 11, 1996        /s/ John B. Parsons
                           __________________________________
                           John B. Parsons


                                                      EXHIBIT D-1

                               FIRST AMENDMENT TO
                STOCK OWNERSHIP AND REGISTRATION RIGHTS AGREEMENT

     This First Amendment to Stock Ownership and  Registration  Rights Agreement
(this "First  Amendment") dated as of May 28,  1996 is between Universal Seismic
Associates, Inc., a Delaware corporation ("USA" or the "Company"), UNEXCO, Inc.,
a Delaware corporation and wholly owned subsidiary of USA ("UNEXCO"),  and RIMCO
Partners,  L.P.  ("RIMCO  I"),  RIMCO  Partners,  L.P.  II ("RIMCO  II"),  RIMCO
Partners,  L.P. III, and RIMCO  Partners,  L.P. IV ("RIMCO IV"), each a Delaware
limited partnership (collectively,  the "RIMCO Holders," and together with their
distributees,  successors  and assigns,  the  "Holders").  RIMCO I, RIMCO II and
RIMCO IV are  referred  to in this  First  Amendment  as the  "Additional  RIMCO
Holders."

                             PRELIMINARY STATEMENTS

     A. The Company and the  Additional  RIMCO  Holders  have  entered into that
certain Warrant Agreement, dated May 28, 1996 (as amended from time to time, the
"Second  Warrant  Agreement"),  which provides for the issuance of warrants (the
"Warrants")  to purchase an  aggregate  of 278,650  shares of common  stock (the
"Additional  Shares"),  par value $.0001 per share, of USA (the "Common Stock"),
subject to adjustment as set forth therein.

     B. USA,  UNEXCO and the RIMCO  Holders  have  heretofore  entered into that
certain Stock Ownership and  Registration  Rights  Agreement,  dated January 19,
1996 (the "Registration  Rights  Agreement"),  whereby,  among other things, USA
agreed to effect the  registration  of the offering and sale of the  Registrable
Securities (as defined in the Registration Rights Agreement).

     C. USA,  UNEXCO and the RIMCO Holders now desire to amend the  Registration
Rights  Agreement with respect to the matters set forth herein and to include in
the Registrable  Securities  subject to the  Registration  Rights  Agreement the
Additional Shares and the Related Securities  provided for in the Second Warrant
Agreement.

     D.  Capitalized  terms  used  herein  shall  have the  respective  meanings
described  thereto in the Second Warrant  Agreement unless herein defined or the
context shall otherwise require.

                                   AGREEMENTS

     NOW,  THEREFORE,  in  consideration  of the  premises  and  other  good and
valuable  consideration,   the  receipt  and  sufficiency  of  which  is  hereby
acknowledged, USA, UNEXCO and the RIMCO Holders agree as follows:

SECTION 1. AMENDMENTS.

     1.1  The  definition  of  "Related   Securities"  in  Section 1.01  of  the
Registration  Rights  Agreement  is hereby  amended in its  entirety  to read as
follows:


                                       -1-

<PAGE>
 
          "Related Securities" means, collectively,  other than the Shares,
     (i)  any  and  all  securities  issued  or  issuable  as a  result  of
     adjustments  made under the Note  Purchase  Agreements  or the Warrant
     Agreement or the Second  Warrant  Agreement,  and in each case any and
     all securities otherwise exchanged therefor or distributed,  issued or
     issuable with respect  thereto and (ii) any and all  securities of the
     Company  or  any  successor  thereto  or  assignee  thereof  that  are
     hereafter transferred, distributed, issued or issuable to the Holders.

     1.2 Section 1.01 of the Registration  Rights Agreement is hereby amended to
include, in alphabetical order, the following definition:

          "Second Warrant  Agreement" means that certain Warrant  Agreement
     dated as of May 28, 1996, by and among Universal  Seismic  Associates,
     Inc.,  RIMCO  Partners,  L.P.,  RIMCO  Partners,  L.P.  II,  and RIMCO
     Partners, L.P. IV.

     1.3 In the  Registration  Rights  Agreement,  all references to the Warrant
Agreement are hereby  amended to be references to the Warrant  Agreement and the
Second Warrant Agreement,  and all references to the Warrants are hereby amended
to include the Warrants issued pursuant to the Second Warrant Agreement.

     1.4 Section 1.01 of the Registration  Rights Agreement is hereby amended to
include, in alphabetical order, the following definition:

          "Additional  Transaction  Documents"  means  the  Second  Warrant
     Agreement  and  the  transaction   documents  executed  and  delivered
     concurrently with the Second Warrant Agreement.

     1.5 Section 1.01 of the Registration  Rights Agreement is hereby amended to
include, in alphabetical order, the following definition:

          "10% Notes" means the 10% Senior Secured General Obligation Notes
     issued by the Company pursuant to the Note Purchase Agreement dated as
     of even date  herewith  among the  Company  and the  Additional  RIMCO
     Holders,  as the  same  may from  time to time be  amended,  modified,
     restated or supplemented.

     1.6 Section 1.03 of the Registration  Rights Agreement is hereby amended in
its entirety to read as follows:

          Subject to compliance with applicable law, immediately  following
     the effective date of the Second Warrant Agreement,  the RIMCO Holders
     holding not less than a majority  (in then  market  value) of the then
     outstanding  Registrable  Securities held by the RIMCO Holders, or any
     designee thereof, shall be entitled to designate a total of


                                       -2-
<PAGE>

     two  persons  to be  members  of the  Company's  Board  of  Directors.
     Immediately  following  the  effective  date  of  the  Second  Warrant
     Agreement, the Company shall take such action as is required under its
     charter  and bylaws to  increase  the size of the  Company's  Board of
     Directors by one and will use its best efforts,  subject to compliance
     with  applicable  law,  to elect or  cause to be  elected  to fill the
     vacancy so  created  one  additional  person  designated  by the RIMCO
     Holders or their  designee,  which  person shall be in addition to the
     person  previously  designated by the RIMCO Holders or their designee.
     So long as (i) any of the USA Senior Notes, the USA Convertible Notes,
     the UNEXCO  Notes,  the 10% Notes or the Warrants  (or any  securities
     exchanged  therefor or  distributed,  issued or issuable  with respect
     thereto and held by or issuable to the  Holders)  are  outstanding  or
     (ii)  the  RIMCO  Holders,  together  with  their  affiliates,  own an
     aggregate of 2.5% or more of the USA Common  Stock,  however  acquired
     (or a then  comparable  proportion  of the  equity  securities  of the
     Company  entitled to vote for the  election of  directors),  the RIMCO
     Holders or their  designee  shall be entitled to the  benefits of this
     Section  1.03,  which shall be applicable to each of the two directors
     provided  for herein (a total of two  directors).  In the event of any
     resignation,  removal,  death or other  termination of any director so
     designated by the RIMCO Holders or their  designee,  or the failure of
     the  stockholders of the Company for any reason to elect such designee
     or to reelect such director, the RIMCO Holders holding not less than a
     majority (in then market  value) of the then  outstanding  Registrable
     Securities held by the RIMCO Holders,  or any designee thereof,  shall
     be entitled to designate one person to serve on the Company's Board of
     Directors in place of each such previously  designated person, and the
     Company  will  use  its  best  efforts,  subject  to  compliance  with
     applicable  law,  to  elect or cause  to be  elected  to the  Board of
     Directors each such person so designated by the RIMCO Holders or their
     designee  (a  total  of  two  directors).  The  RIMCO  Holders  hereby
     undertake  and agree that,  not later than 15 days  following  written
     request from the Company,  the RIMCO Holders or their  designee  shall
     furnish to the  Company's  Board of Directors  such  information  with
     respect to each such  director  designee as is required to comply with
     applicable  law,  rule or  regulation,  and with  Items 401 and 404 of
     Regulation S-K or Regulation S-B or any successor regulation under the
     1933 Act, if then applicable to the Company.

SECTION 2.        REPRESENTATIONS AND WARRANTIES OF USA AND THE COMPANY.

     2.1 USA and UNEXCO represent and warrant to the RIMCO Holders that:

          (a) this  First  Amendment  has been  duly  authorized,  executed  and
     delivered by them and this First Amendment constitutes the legal, valid and
     binding obligation of USA and UNEXCO enforceable against them in accordance
     with its  terms,  except  as  enforcement  may be  limited  by  bankruptcy,
     insolvency,  reorganization,   moratorium  or  similar  laws  or  equitable
     principles relating to or limiting creditors' rights generally;


                                       -3-
<PAGE>
          (b) The  Registration  Rights  Agreement,  as  amended  by this  First
     Amendment,  constitutes the legal,  valid and binding obligation of USA and
     UNEXCO  enforceable  against them in accordance  with its terms,  except as
     enforcement  may be  limited  by  bankruptcy,  insolvency,  reorganization,
     moratorium or similar laws or equitable  principles relating to or limiting
     creditors' rights generally;

          (c) the execution,  delivery and performance by USA and UNEXCO of this
     First  Amendment (i) has been duly  authorized  by all requisite  corporate
     action  and, if  required,  shareholder  action,  (ii) does not require the
     consent or approval of any  governmental or regulatory body or agency,  and
     (iii) will not (A)  violate  (1) any  provision  of law,  statute,  rule or
     regulation or its certificate of incorporation or bylaws,  (2) any order of
     any  court  or any  rule,  regulation  or  order  of any  other  agency  or
     government binding upon it, or (3) any provision of any material indenture,
     agreement  or other  instrument  to  which  it is a party  or by which  its
     properties  or  assets  are or may be bound,  or (B)  result in a breach or
     constitute  (alone  or with due  notice or lapse of time or both) a default
     under any such indenture, agreement or other instrument;

          (d) all representations  and warranties  contained in the Registration
     Rights Agreement and in the Additional  Transaction  Documents are true and
     correct in all material  respects with the same force and effect as if made
     by USA or the Company, as applicable, on and as of the date hereof.

          (e) the  Company  hereby  represents  and  warrants  that the Board of
     Directors  of USA has taken  all  actions  necessary  under  Delaware  law,
     including,  without limitation,  the approval of the Additional Transaction
     Documents and the consummation of the transactions contemplated thereby, to
     render the  provisions of Section 203 of the Delaware  General  Corporation
     Law  inapplicable  to the RIMCO  Holders  and their  affiliates  and to the
     transactions   contemplated  in  the  Additional   Transaction   Documents,
     including,  without  limitation,  the  acquisition  of shares of USA Common
     Stock by the RIMCO Holders pursuant to the transactions contemplated by the
     Second Warrant Agreement, as may be amended from time to time.

SECTION 3. CONDITIONS TO EFFECTIVENESS OF THIS FIRST AMENDMENT.

     3.1 This First Amendment shall not become effective until, and shall become
effective when, each of the following conditions shall have been satisfied:

          (a) executed  counterparts of this First  Amendment,  duly executed by
     USA,  UNEXCO and the RIMCO Holders,  shall have been delivered to the RIMCO
     Holders;

          (b) the RIMCO Holders shall have received a copy of the resolutions of
     the  Board  of  Directors  of USA and  UNEXCO  authorizing  the  execution,
     delivery and performance by


                                       -4-
<PAGE>

     USA and  UNEXCO of this  First  Amendment,  certified  by their  respective
     Secretary or Assistant Secretary;

          (c) the  representations and warranties of USA and UNEXCO set forth in
     Section 2 hereof are true and correct on and as of the date hereof; and

          (d) the RIMCO Holders  shall have  received the  favorable  opinion of
     counsel to USA and UNEXCO as to the matters  set forth in Sections  2.1(a),
     2.1(b) and 2.1(c)  hereof,  which  opinion  shall be in form and  substance
     satisfactory to the RIMCO Holders.

SECTION 4.        PAYMENT OF RIMCO HOLDERS' COUNSEL FEES AND EXPENSES.

     4.1 USA and UNEXCO  agree to pay,  upon  demand,  the  reasonable  fees and
expenses of Andrews & Kurth L.L.P.,  counsel to the RIMCO Holders, in connection
with the  negotiation,  preparation,  approval,  execution  and delivery of this
First Amendment.

SECTION 5.        MISCELLANEOUS.

     5.1 This First  Amendment shall be construed in connection with and as part
of the  Registration  Rights  Agreement,  and except as modified  and  expressly
amended by this First Amendment, all terms, conditions,  and covenants contained
in the Registration Rights Agreement are hereby ratified and shall be and remain
in full force and effect.

     5.2 Any and all  notices,  requests,  certificates  and  other  instruments
executed and delivered  after the execution and delivery of this First Amendment
may refer to the Registration Rights Agreement without making specific reference
to this First Amendment but  nevertheless all such references shall include this
First Amendment unless the context otherwise requires.

     5.3 The descriptive headings of the various Sections or parts of this First
Amendment  are for  convenience  only  and  shall  not  affect  the  meaning  or
construction of any of the provisions hereof.

     5.4 This First  Amendment  shall be construed  and  enforced in  accordance
with,  and the rights of the parties shall be governed by, the laws of the State
of New York,  excluding  choice-of-law  principles of the law of such State that
would  require the  application  of the laws of a  jurisdiction  other than such
State.




                                       -5-

<PAGE>

     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed  by  their  respective   representatives   thereunto  duly  authorized,
effective as of the date first above written.

                                           UNIVERSAL SEISMIC ASSOCIATES, INC.


                                           By:   /s/ Michael J. Pawelek
                                                ----------------------------- 
                                           Name:    Michael J. Pawelek
                                           Title:   President

                                           UNEXCO, INC. 


                                           By:   /s/ Michael J. Pawelek
                                                -----------------------------
                                           Name:    Michael J. Pawelek
                                           Title:   President


                                           RIMCO PARTNERS, L.P.
                                           RIMCO PARTNERS, L.P. II,
                                           RIMCO PARTNERS, L.P. III, and
                                           RIMCO PARTNERS, L.P. IV

                                           By: Resource Investors Management
                                                 Company Limited Partnership,
                                                 their general partner

                                           By: RIMCO Associates, Inc.,
                                                    its general partner


                                           By:    /s/ Gary Milavec
                                                 -----------------------------
                                           Name:    Gary Milavec
                                           Title:   Vice President


                                       -6-




                                                          EXHIBIT E

                                WARRANT AGREEMENT

     WARRANT  AGREEMENT  (this  "Agreement")  dated as of May 28,  1996,  by and
between the persons or entities  listed on Exhibit A hereto  (which  Exhibit and
all other  exhibits  to which  reference  is herein  made shall be  incorporated
herein  for  all  purposes  by  such  reference)  (sometimes  individually  as a
"Subscriber"  and   collectively  as   "Subscribers")   and  UNIVERSAL   SEISMIC
ASSOCIATES, INC., a Delaware corporation (the "Company").

                              W I T N E S S E T H:

     WHEREAS, at the date hereof, the authorized capital of the Company consists
of  20,000,000  shares of Common  Stock,  par value  $.0001 per share,  of which
4,221,420 shares are issued and outstanding; and

     WHEREAS,  the  Company  proposes  to issue the Notes  pursuant  to the Note
Purchase Agreement executed as of even date herewith; and

     WHEREAS,  in order to induce the Subscribers to purchase the Notes pursuant
to the Note Purchase  Agreement,  the Company desires to issue,  and Subscribers
desire to acquire, warrants (each a "Warrant"), in substantially the form of the
Warrant attached hereto as Exhibit B, to purchase an aggregate of 278,650 shares
of Common Stock  exercisable  at the Initial  Purchase  Price;  both the Initial
Purchase  Price and the number of shares of Common Stock  issuable upon exercise
of a Warrant (the  "Warrant  Amount")  being  subject to possible  adjustment as
provided  in the  form of  Warrant,  on the  terms  and  conditions  more  fully
hereinafter set forth;

     NOW THEREFORE,  in  consideration  of the premises and the mutual covenants
herein contained, the parties hereto agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

For purposes of this Agreement,

     "1933 Act" means the Securities Act of 1933, as amended.

     "1934 Act" means the Securities and Exchange Act of 1934, as amended.

     "Annual Report" means the Company's annual report on Form 10-KSB filed with
the Commission for the Company's fiscal year ended June 30, 1995.

     "Certificate of Incorporation"  means the Certificate of Incorporation,  as
amended,  of the  Company  in effect on the date  hereof  and as filed  with the
Secretary of State of Delaware.



                                       -1-
<PAGE>

     "Closing" and "Closing Date" mean,  respectively,  the  consummation of the
transaction contemplated in this Agreement and the date thereof.

     "Commission"  means the  Securities  and Exchange  Commission of the United
States of America.

     "Common Stock" has the meaning specified in the Warrant attached as Exhibit
B.
 
     "Initial Purchase Price" means $5.00 per share of Common Stock,  subject to
possible adjustment as provided in this Agreement.

     "Material  Adverse Effect" has the meaning specified in Annex A to the Note
Purchase Agreement.

     "Note Purchase  Agreement" means that certain Note Purchase Agreement dated
as of even date herewith  between the Company and the  Subscribers,  as the same
may from time to time be amended, modified, restated or supplemented.

     "Notes" means the 10% Senior Secured General Obligation Notes issued by the
Company pursuant to the Note Purchase Agreement.

     "Person"  has  the  meaning  specified  in  Annex  A to the  Note  Purchase
Agreement.

     "Registration  Rights Agreement" means the Stock Ownership and Registration
Rights Agreement dated as of January 19, 1996, as amended by the First Amendment
thereto  dated as of the date  hereof,  among the Company and the other  parties
named therein, including the Subscribers.

     "Shares" has the meaning specified in the Warrant attached as Exhibit B.

     "Subscriber"  means  those  Persons  listed on  Exhibit  A hereto,  and any
successor or assignee of such Person.

     "Transaction  Documents"  has the meaning  specified  in the Note  Purchase
Agreement.

     "Warrant  Securities"  means the shares of Common Stock or other securities
distributed, issued or issuable to any Subscriber (or any holder of the Warrant)
upon exercise of a Warrant  issued  pursuant to the terms of this  Agreement and
the Warrant.




                                       -2-
<PAGE>

                                   ARTICLE II
                              ISSUANCE OF WARRANTS

     Section 2.01. Issuance of Warrants. On the basis of the representations and
warranties  of the  Company and  Subscribers  set forth in this  Agreement,  and
subject to the  conditions  to Closing  hereinafter  provided,  each  Subscriber
severally  subscribes for and agrees to acquire, and the Company agrees to issue
and deliver to such Subscriber, for consideration hereby acknowledged,  Warrants
exercisable  at any time on or after the Closing  Date to purchase the number of
shares of Common Stock set forth opposite such Subscriber's name on Exhibit A.

     Section 2.02.  Closing.  Consummation of the  transactions  contemplated in
this  Agreement  shall be effected at the offices of Andrews & Kurth  L.L.P.  in
Houston,  Texas,  on May 28, 1996, or at such other time or place as the parties
may mutually agree. At the Closing,  the Company will issue to each  Subscriber,
for consideration hereby acknowledged, Warrants to purchase the number of shares
of Common Stock set forth  opposite  such  Subscriber's  name on Exhibit A, each
such Warrant to be in  substantially  the form attached hereto as Exhibit B with
the blanks appropriately filled in.

                                   ARTICLE III
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company  represents and warrants to and agrees with each  Subscriber as
follows:

     Section 3.01. Organization and Qualification.  The Company is a corporation
duly  organized,  validly  existing and in good  standing  under the laws of the
State of Delaware and has all requisite corporate power to carry on its business
as now  conducted,  and the  Company has the  corporate  power to enter into and
perform this Agreement and to issue and deliver the Warrants as herein provided.
The Company and each of its  Subsidiaries  are duly qualified to do business and
are in good standing as foreign corporations in all foreign  jurisdictions where
their  ownership or leasing of  properties  for the conduct of their  respective
business  requires such  qualification,  except where failure to be so qualified
would  not have a  Material  Adverse  Effect.  True and  correct  copies  of the
Company's Amended and Restated Bylaws and Certificate of Incorporation have been
certified by the Company and delivered at the Closing.  Neither the  Certificate
of  Incorporation  nor the Amended and Restated  Bylaws,  as so certified,  have
otherwise been modified or amended.

     Section 3.02.  Capitalization.  The authorized capital stock of the Company
consists of 20,000,000  shares of Common Stock,  par value $.0001 per share,  of
which 4,221,420  shares are issued and outstanding on the date hereof.  No other
shares of capital  stock of the  Company are issued or  outstanding  on the date
hereof. The shares of Common Stock issued and outstanding at the date hereof are
validly issued, fully paid and nonassessable.  The shares of Common Stock issued
and  outstanding at the date hereof have been issued in accordance with Delaware
law and with all  applicable  federal and Texas  securities  laws. The shares of
Common Stock (and, if applicable,  other Warrant Securities),  upon issuance and
payment therefor as provided in the Warrant,  will be validly issued, fully paid
and   nonassessable.   There   are  no   outstanding   convertible   securities,
subscriptions,


                                       -3-
<PAGE>

options, calls or other agreements,  equities, claims or commitments relating to
the  acquisition  from the  Company  of shares of its  capital  stock  except as
disclosed in the Annual Report or on Exhibit C hereto.

     Section 3.03.  Reaffirmation of Representations and Warranties.  All of the
representations  and  warranties of the Company set forth in this  Agreement and
the Note Purchase  Agreement,  and in any and all other instruments,  agreements
and  certificates  executed by Company in connection  with  consummation  of the
transactions contemplated in this Agreement and the Note Purchase Agreement, are
true and correct.

     Section  3.04.  Authority.  The Board of Directors of the Company has taken
all action  required by law, its Certificate of  Incorporation,  its Amended and
Restated  Bylaws  and  otherwise,  to  authorize  the  execution,  delivery  and
performance of this Agreement, and the sale and issuance of the Warrants and the
reservation  for issuance of the Common Stock  issuable upon the exercise of the
Warrants;  and this Agreement is the valid and binding obligation of the Company
enforceable  against  the  Company  in  accordance  with its  terms,  except  as
otherwise  limited by  bankruptcy,  insolvency,  reorganization,  moratorium and
similar laws affecting  creditors'  rights,  and principles of equity and except
insofar as the enforceability of the indemnification  provisions of Section 7.09
of this  Agreement may be limited by applicable  law. The execution and delivery
of this Agreement does not and the  performance of this Agreement by the Company
will not:

          (i) violate any provision of the Certificate of  Incorporation  or the
     Amended and Restated  Bylaws of the Company or  constitute a default  under
     any material loan or credit agreement,  indenture,  mortgage, deed of trust
     or other  contract or agreement to which the Company is a party or by which
     it is bound; or

          (ii)  violate  any  order,  writ,  injunction  or decree of any court,
     administrative  agency  or  governmental  body  that is  applicable  to the
     Company.

     Section  3.05.  Governmental  Consents.  No  consent,  approval,  order  or
authorization of, or registration,  qualification,  designation,  declaration or
filing with, any federal,  state, local or provincial  governmental authority on
the part of the Company is required in connection  with the  consummation of the
transactions contemplated by this Agreement or the Warrant.

     Section  3.06.  Commission  Filings.  The Company is a public  company with
Common Stock duly registered under Section 12(g) of the 1934 Act. The Company is
current in all of the filing  requirements  applicable to it under the 1934 Act,
and the regulations  promulgated  thereunder,  on the appropriate forms required
therefor.  All such filings contain substantially all information required to be
disclosed therein under the 1934 Act and the regulations promulgated thereunder,
and none of such information contains any untrue statement of a material fact or
omits  any  material  fact  necessary  to make the  statements  made  under  the
circumstances which they were made not misleading.


                                       -4-
<PAGE>

     Section 3.07. Disclosure. The representations and warranties of the Company
made herein and in any other  statements  or  certificates  made or delivered in
connection  herewith  contain no untrue statement of a material fact and omit no
material fact necessary to make the statements herein or therein not misleading.

     Section  3.08.  Registration  Rights.  The Company has not entered  into or
proposed to enter into, and does not currently intend to enter into, any oral or
written agreement with any person or entity (other than the Registration  Rights
Agreement)  to register  for sale or public  distribution  any of the  Company's
capital  stock or other  securities  under the 1933 Act or any state  securities
act, other than the  registration  rights granted  pursuant to the  Registration
Rights Agreement and those described on Exhibit D hereto.

                                   ARTICLE IV
                  REPRESENTATIONS AND WARRANTIES OF SUBSCRIBERS

     Each  Subscriber  represents and warrants to and agrees with the Company as
follows:

     Section 4.01.  Organization.  Each of RIMCO Partners, L.P., RIMCO Partners,
L.P. II and Rimco Partners,  L.P. IV is a limited partnership duly organized and
existing  under the laws of the State of Delaware,  and each  Subscriber has all
partnership power and authority to carry on its respective business as currently
conducted and to enter into and perform this Agreement.

     Section  4.02.  Investment  Purpose.  The  Warrants  to be acquired by each
Subscriber pursuant to this Agreement, and the Warrant Securities, are being, or
will be, acquired for investment for such  Subscriber's own account and not with
a view to, or for resale in connection with, any distribution of such securities
within the  meaning  of the 1933 Act,  and such  securities  will not be sold or
otherwise  disposed of without  registration or other  compliance under the 1933
Act or exemption  therefrom.  Each  Subscriber  agrees that the Warrants and the
certificate or certificates  (or other  instrument or instruments)  representing
the Warrant Securities may be inscribed with a legend substantially as follows:

     "The  securities   represented  by  this  certificate  have  not  been
     registered  under the  Securities  Act of 1933,  as amended (the "1933
     Act"), or the securities laws of any state. Such securities may not be
     sold or otherwise disposed of unless pursuant to a registered offering
     or by transfer  exempt from  registration  or unless sold  pursuant to
     Rule 144 under the 1933 Act."

     Each  Subscriber  agrees that the Company may place a stop  transfer  order
with its  transfer  agent,  if any,  with  respect to the  Warrants  and Warrant
Securities.  Each  Subscriber  represents  that  it was  not  organized  for the
specific purpose of acquiring the Warrants or Warrant  Securities and that it is
an "accredited  investor" within the meaning of Regulation D under the 1933 Act.
Each  Subscriber   acknowledges  that  neither  the  Warrants  nor  the  Warrant
Securities  have been  registered  by the Company  pursuant to the  registration
provisions of the 1933 Act or the securities laws of any


                                       -5-
<PAGE>

state in reliance upon the  availability  of exemptions  from such  registration
that depend in part on each Subscriber's representations contained herein.

     The above  legend  shall be removed from the  certificates  or  instruments
evidencing the Warrant Securities,  and the Company shall issue a certificate or
instrument  without  such  legend  to the  holder of such  security  (i) if such
security is registered  under the 1933 Act or (ii) in the case of any holder who
is not an  affiliate  of the Company  within the  meaning of Rule 144,  upon the
occurrence  of the date on which such holder  satisfies  the  requisite  holding
period  requirement  contained in Rule 144(k) under the 1933 Act,  provided that
Rule 144 or any other rule or  regulation  promulgated  under or pursuant to the
1933 Act does not,  in the opinion of the  Company's  counsel,  impose,  at such
time,  any  restrictions  on  the  transfer  of  such  securities,   other  than
satisfaction of the holding period requirement contained therein.

     Section 4.03.  Non-Registration.  Each Subscriber has been advised that the
Warrant Securities to be acquired by such Subscriber  pursuant to this Agreement
must be held indefinitely by such Subscriber unless such Warrant  Securities are
subsequently  registered  under  or sold in  compliance  with the 1933 Act or an
exemption from such  registration is available.  The Company has the obligations
set  forth  in  the  Registration  Rights  Agreement  to  register  the  Warrant
Securities for resale.

     Section  4.04.  Authority.  Each  Subscriber  represents  that  all  action
required by law, its partnership  agreement or other similar document  governing
the internal affairs of Subscriber or otherwise, has been taken to authorize the
execution, delivery and performance of this Agreement and the acquisition of the
Warrants  and Warrant  Securities  to be acquired  by such  Subscriber  pursuant
hereto.  This Agreement is the valid and binding  obligation of each  Subscriber
enforceable  against such  Subscriber  in accordance  with its terms,  except as
otherwise  limited by  bankruptcy,  insolvency,  reorganization,  moratorium and
similar laws affecting  creditors'  rights, and principles of equity, and except
insofar as the enforceability of the indemnification  provisions of Section 7.09
of this Agreement may be limited by applicable  laws. The execution and delivery
of this  Agreement  by each  Subscriber  does not, and the  performance  of this
Agreement  by  such  Subscriber  will  not,  (i) violate  any  provision  of the
partnership  agreement or other similar document  governing the internal affairs
of such  Subscriber  or  constitute a default  under any material loan or credit
agreement,  indenture,  mortgage,  deed of trust or other  material  contract or
agreement to which such  Subscriber  is a party or by which such  Subscriber  is
bound,  or (ii)  violate  any order,  writ,  injunction  or decree of any court,
administrative agency or governmental body.

     Section 4.05.  Reaffirmation of Representations and Warranties.  All of the
representations  and warranties of the  Subscribers  set forth in this Agreement
and  the  Note  Purchase  Agreement,  and  in any  and  all  other  instruments,
agreements and  certificates  executed by the Subscribers in connection with the
consummation  of the  transactions  contemplated  in this Agreement and the Note
Purchase Agreement, are true and correct.




                                       -6-
<PAGE>

                                    ARTICLE V
                              CONDITIONS TO CLOSING

     Section 5.01.  Conditions to Subscribers'  Obligations.  The obligations of
the  Subscribers  hereunder  shall be  subject  to the  fulfillment  prior to or
contemporaneously with the Closing of each of the following conditions,  any one
or more of which  can be  waived  only with the  written  consent  of all of the
Subscribers:

          (i)  Each of the  representations  and  warranties  pertaining  to the
     Company  contained  herein  or  in  the  Warrants  or in  any  certificate,
     instrument  or other  document  delivered by or on behalf of the Company in
     connection  herewith shall be true and correct in all material  respects on
     and as of the  Closing  Date  with the same  force  and  effect  as if such
     representation  and warranty had then been made, and the Subscribers  shall
     have  received  a  certificate  to that  effect,  satisfactory  in form and
     substance  to the  Subscribers,  dated the Closing Date and executed by the
     Chief Executive Officer of the Company.

          (ii) The Company shall have performed and complied with all covenants,
     obligations,  agreements  and  conditions  required by this Agreement to be
     performed or complied  with by the Company on or prior to the Closing Date,
     and the  Subscribers  shall have  received a  certificate  to that  effect,
     satisfactory  in form and substance to the  Subscribers,  dated the Closing
     Date and executed by the Chief Executive Officer of the Company.

          (iii) There shall not have occurred,  in the good faith and reasonable
     opinion of the  Subscribers,  any material  adverse  changes in the assets,
     liabilities,   financial  condition,   business,   operations,  affairs  or
     circumstances of the Company.

          (iv) The  Subscribers  shall have received the First  Amendment to the
     Registration  Rights  Agreement dated the Closing Date and duly authorized,
     executed and delivered by the Company and its wholly owned subsidiary party
     thereto.

          (v)  At the  time  of  Closing,  all  legal  matters  incident  to the
     transactions   herein  contemplated  shall  be  satisfactory  in  form  and
     substance to Andrews & Kurth L.L.P., counsel for the Subscribers.

          (vi) The Company shall have caused Boyer, Ewing & Harris Incorporated,
     counsel to the  Company,  to deliver to  Subscribers  an opinion  dated the
     Closing  Date  substantially  in the form  attached  to the  Note  Purchase
     Agreement.

     Section 5.02.  Conditions to Obligations of the Company. The obligations of
the  Company  hereunder  shall  be  subject  to  the  fulfillment,  prior  to or
contemporaneously with the Closing, of each of the following conditions, any one
or more of which may be waived by the Company:



                                       -7-
<PAGE>

          (i) Each of the  representations  and  warranties  of each  Subscriber
     contained  herein  or in any  certificate,  instrument  or  other  document
     delivered by or on behalf of any such  Subscriber  in  connection  herewith
     shall be true and correct in all material respects on and as of the Closing
     Date with the same force and effect as if such  representation and warranty
     had  been  made on such  date,  and  the  Company  shall  have  received  a
     certificate  to that  effect,  satisfactory  in form and  substance  to the
     Company,  dated the Closing Date and executed by a duly authorized  officer
     or agent of such Subscriber.

          (ii) Each  Subscriber  shall  have  performed  and  complied  with all
     covenants,  obligations,  agreements  and  conditions  required by (1) this
     Agreement to be performed or complied  with by such  Subscriber on or prior
     to the Closing Date and (2) the Note Purchase  Agreement to be performed or
     complied  with by such  Subscriber on or prior to the closing date thereof,
     and the Company shall receive a certificate to that effect, satisfactory in
     form and substance to the Company, dated the Closing Date and executed by a
     duly authorized officer or agent of such Subscriber.

          (iii)  At the time of  Closing,  all  legal  matters  incident  to the
     transactions   herein  contemplated  shall  be  satisfactory  in  form  and
     substance to Boyer, Ewing & Harris Incorporated, counsel for the Company.

                                   ARTICLE VI
                            COVENANTS OF THE COMPANY

     The Company covenants and agrees with Subscribers as follows:

     Section  6.01.  Reporting  Requirements.  The Company  will furnish to each
Subscriber copies of all public filings made by or on behalf of the Company with
the  Commission,  and all press releases  prepared or released by the Company or
its employees or agents.

     Section 6.02. Inspection.  The Company shall permit each Subscriber and any
subsequent holder of a Warrant,  at such person's expense,  to visit and inspect
the  Company's  properties,  to examine  its books of account and records and to
discuss the Company's affairs,  finances and accounts with its officers,  all at
such  reasonable  times as may be requested by such  person,  provided  that any
holder of a Warrant shall have the same  inspection  rights as a stockholder  of
the Company under Delaware law.




                                       -8-
<PAGE>

                                   ARTICLE VII
                                  MISCELLANEOUS

     Section  7.01.  Amendment.  This  Agreement  may be  amended  only upon the
written  approval  of the  Company  and each  Subscriber  whose  obligations  or
benefits under this Agreement are affected by such amendment.

     Section 7.02. Assignability.  This Agreement and all rights and remedies of
Subscribers hereunder may be assigned by the Subscribers in whole or in part.

     Section 7.03. Notices.  All notices and other  communications  provided for
hereunder shall be in writing and sent (i) by telecopy if the sender on the same
day sends a confirming  copy of such notice by a recognized  overnight  delivery
service  (charges  prepaid) or (ii) by registered or certified  mail with return
receipt requested (postage prepaid) or (iii) by a recognized  overnight delivery
service (with charges prepaid).

          (i) if to the Company,  at Universal Seismic  Associates,  Inc., 16420
     Park Ten  Place,  Suite  300,  Houston,  Texas  77084-5051,  Telecopy  No.:
     713-578-7091,  or such  other  address as it shall  have  specified  to the
     Subscribers in writing; or

          (ii) if to a Subscriber,  at each of its addresses set forth below, or
     such other address as it shall have specified to the Company in writing.

Notices  given under this Section 7.03 shall be deemed given only when  actually
received.

     Section 7.04. Parties in Interest; Binding Effect. The terms and conditions
of this  Agreement  shall  inure  to the  benefit  of and be  binding  upon  the
respective heirs, legal  representatives,  successors and assigns of the parties
hereto. Nothing in this Agreement, expressly or impliedly, is intended to confer
upon any party,  other than the parties hereto and their respective heirs, legal
representatives,  successors and assigns, any rights,  remedies,  obligations or
liabilities under or by reason of this Agreement,  except as expressly  provided
herein.

     Section 7.05.  Section and Other  Headings.  The section and other headings
contained in this Agreement are for reference purposes only and shall not affect
the meaning or interpretation of this Agreement.

     Section  7.06.  Severability.  Any  provision  of  this  Agreement  that is
prohibited or unenforceable in any jurisdiction  shall, as to such jurisdiction,
be ineffective to the extent of such  prohibition  or  unenforceability  without
invalidating the remaining provisions hereof, and any such


                                       -9-
<PAGE>

prohibition or  unenforceability  in any jurisdiction  shall (to the full extent
permitted by law) not invalidate or render  unenforceable  such provision in any
other jurisdiction.

     Section 7.07. Governing Law. This Agreement shall be construed and enforced
in accordance with, and the rights of the parties shall be governed by, the laws
of the State of New York, excluding choice-of-law  principles of the law of such
State that would require the  application  of the laws of a  jurisdiction  other
than such State.

     Section 7.08. Counterparts. This Agreement may be executed in any number of
counterparts,  each of which  shall be an  original,  but all of which  together
shall  constitute one  instrument.  Each  counterpart may consist of a number of
copies hereof,  each signed by less than all, but together signed by all, of the
parties hereto.

     Section 7.09.  Finders' Fees. Each party hereto  represents that it neither
is nor will be obligated for any finders' fees or commission in connection  with
the transactions  referenced herein.  Each Subscriber agrees to indemnify and to
hold harmless the Company from any liability for any commission or  compensation
in the nature of finders' fees (and the costs and expenses of defending  against
such liability or asserted  liability)  for which such  Subscriber or any of its
officers, partners, employees, or representatives is responsible.

     The Company agrees to indemnify and hold harmless each  Subscriber from any
liability for any commission or compensation in the nature of finders' fees (and
the  costs  and  expenses  of  defending  against  such  liability  or  asserted
liability)  for  which  the  Company  or  any  of  its  officers,  employees  or
representatives is responsible.

     Section 7.10.  Attorney's  Fees.  The Company  agrees to pay all reasonable
fees and expenses of Andrews & Kurth L.L.P.  in connection  with the negotiation
and execution of this Agreement.

     Section 7.11.  Survival.  The  representations,  warranties,  covenants and
agreements made herein by the Company shall survive (i) any  investigation  made
by any Subscriber and (ii) the Closing.


                                      -10-
<PAGE>

     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed  by  their  respective   representatives   thereunto  duly  authorized,
effective as of the date first above written.

                                           UNIVERSAL SEISMIC ASSOCIATES, INC.

                                           By:    /s/ Michael J. Pawelek
                                                 -------------------------     
                                           Name:  Michael J. Pawelek
                                           Title: President

                                           "SUBSCRIBERS"

                                           RIMCO Partners, L.P.
                                           RIMCO Partners, L.P. II
                                           RIMCO Partners, L.P. IV

                                           By:  Resources Investors Management
                                                Company Limited Partnership,
                                                their general partner

                                           By:  RIMCO Associates, Inc.,
                                                its general partner

                                           By:    /s/ Gary Milavec
                                                 -------------------------   
                                           Name:  Gary Milavec
                                           Title: Vice President

                                           Addresses for Notices:

                                           22 Waterville Road
                                           Avon, Connecticut   06001
                                           Telecopy No.: 213-678-9382

                                           600 Travis Street - Suite 6875
                                           Houston, Texas  77002
                                           Telecopy No.: 713-247-0730
 


                                      -11-
<PAGE>

                                                                EXHIBIT A TO
                                                           WARRANT AGREEMENT


         SUBSCRIBER                                     NUMBER
      NAME AND ADDRESS                                OF SHARES
      ----------------                                ---------


RIMCO Partners, L.P.                                   175,550


RIMCO Partners, L.P. II                                 31,766


RIMCO Partners, L.P. IV                                 71,334
                                                       -------   
                                                       278,650




                                      -12-
<PAGE>

                                                  EXHIBIT B TO WARRANT AGREEMENT


NEITHER THIS WARRANT NOR THE SECURITIES  ISSUABLE UPON EXERCISE HEREOF HAVE BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "1933 ACT"), OR THE
SECURITIES  LAWS OF ANY  STATE.  SUCH  SECURITIES  MAY NOT BE SOLD OR  OTHERWISE
DISPOSED OF UNLESS PURSUANT TO A REGISTERED  OFFERING OR BY TRANSFER EXEMPT FROM
REGISTRATION  OR UNLESS SOLD  PURSUANT  TO RULE 144 UNDER THE 1933 ACT.  CERTAIN
CAPITALIZED TERMS USED HEREIN WITHOUT  DEFINITION HAVE THE MEANINGS SPECIFIED IN
THE WARRANT AGREEMENT DATED AS OF MAY 28, 1996 (THE "WARRANT AGREEMENT").

                       UNIVERSAL SEISMIC ASSOCIATES, INC.

                          Common Stock Purchase Warrant

     This is to  Certify  that,  for value  received,  ___________________  (the
"holder"),  upon due  exercise of this  Warrant,  is  entitled to purchase  from
Universal Seismic Associates,  Inc., a Delaware corporation (the "Company"),  at
any time on or after the Closing Date of the Warrant  Agreement,  and before the
close of business on January 19, 2003,  or if not a trading date on the New York
Stock Exchange,  the next following trading date (the "Expiration Date"), all or
any part of  ________________________  shares  of fully  paid and  nonassessable
Common Stock,  $.0001 par value per share, of the Company (the "Common  Stock"),
at a purchase price of $5.00 per share (the "Initial Purchase Price"),  both the
Initial  Purchase  Price and the number of shares of Common Stock  issuable upon
exercise of this Warrant being subject to possible adjustment as provided below.

     This Warrant is hereinafter called the "Warrant." The holder hereof and all
subsequent  holders of this Warrant,  to the extent  provided  herein and in the
Warrant Agreement,  shall be entitled to all rights and benefits provided to the
holder or holders hereof pursuant to the terms of that certain Warrant Agreement
and that certain  Registration Rights Agreement,  each as defined in the Warrant
Agreement.

     Section 1. Exercise of Warrant. The holder of this Warrant may, at any time
on or after the  Closing  Date of the  Warrant  Agreement,  and on or before the
Expiration Date, exercise this Warrant in whole at any time or in part from time
to time for the  purchase  of the  shares  of  Common  Stock  or  other  Warrant
Securities  which such  holder is then  entitled to  purchase  hereunder  at the
Purchase Price (as  hereinafter  defined).  In order to exercise this Warrant in
whole or in part,  the holder  hereof shall deliver to the Company (i) a written
notice of such holder's  election to exercise  this Warrant,  which notice shall
specify the number of shares of Common  Stock to be  purchased,  (ii) payment of
the aggregate  purchase  price of the shares of Common Stock being  purchased by
certified or bank  cashier's  check,  and (iii) this Warrant,  provided that, if
such Warrant  Securities have not then been  registered  under the 1933 Act, the
Company may require that such holder furnish to the Company a written  statement
that such holder is  purchasing  such Warrant  Securities  for such holder's own
account for investment and not with a view to the distribution thereof, and that
none of such shares will be offered or sold in  violation of the  provisions  of
the 1933 Act. Upon receipt thereof,


                                       -1-
<PAGE>

the Company shall, as promptly as  practicable,  execute or cause to be executed
and  deliver to such  holder a  certificate  or  certificates  representing  the
aggregate  number of shares of Common  Stock (or if  applicable,  other  Warrant
Securities)  specified in said notice.  The stock certificate or certificates so
delivered  shall  be in the  denomination  of 100  shares  each  or  such  other
denominations  as may be specified in said notice and shall be registered in the
name of such holder or such other name as shall be designated in said notice.

     No fractional  shares of Common Stock are to be issued upon the exercise of
this  Warrant,  but the Company  shall pay a cash  adjustment  in respect of any
fraction of a share which would  otherwise be issuable in an amount equal to the
same  fraction of the market  price per share of the Common  Stock on the day of
exercise,  as reasonably  determined by the Company.  If this Warrant shall have
been exercised only in part, the Company shall,  at the time of delivery of said
certificate or certificates, deliver to such holder a new Warrant evidencing the
rights of such holder to purchase  the  remaining  shares of Common Stock called
for by this Warrant,  which new Warrant shall in all other respects be identical
with this Warrant,  or, at the request of such holder,  appropriate notation may
be made on this Warrant and same returned to such holder.  The Company shall pay
all  expenses,   taxes  and  other  charges   payable  in  connection  with  the
preparation,  execution and delivery of stock  certificates  under this Section,
except that, if such stock certificates are requested to be registered in a name
or names other than the name of the holder of this Warrant,  funds sufficient to
pay all stock  transfer  taxes which  shall be payable  upon the  execution  and
delivery of such stock  certificates  shall be paid by the holder  hereof at the
time of delivering the notice of exercise mentioned above.

     The Company represents, warrants and agrees that all shares of Common Stock
issuable  upon any  exercise of this  Warrant in  accordance  herewith  shall be
validly authorized and issued, fully paid and nonassessable.

     This Warrant  shall not entitle the holder hereof to any of the rights of a
stockholder of the Company prior to exercise in the manner herein provided.

     Section 2. Transfer, Division and Combination. Subject to the provisions of
Section 3,  this  Warrant is  transferable  in the same manner and with the same
effect as in the case of a negotiable  instrument payable to a specified person.
The Company, however, may treat the registered holder hereof as the owner hereof
for all purposes until this Warrant shall have been  surrendered for transfer as
hereinafter provided.

     Section 3. Compliance with 1933 Act. (i) Each  certificate for Common Stock
(or other Warrant Securities) initially issued upon the exercise of this Warrant
and each  certificate for Common Stock (or other Warrant  Securities)  issued to
subsequent transferees of any such certificate shall (unless otherwise permitted
by  this  Section  3)  be  stamped  or  otherwise   imprinted   with  legend  in
substantially the following form:

     "THE  SECURITIES   REPRESENTED  BY  THIS  CERTIFICATE  HAVE  NOT  BEEN
     REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED

                                       -2-
<PAGE>

        
     (THE "1933 ACT"), OR THE SECURITIES LAWS OF ANY STATE. SUCH SECURITIES
     MAY  NOT BE  SOLD  OR  OTHERWISE  DISPOSED  OF  UNLESS  PURSUANT  TO A
     REGISTERED  OFFERING OR BY TRANSFER EXEMPT FROM REGISTRATION OR UNLESS
     SOLD PURSUANT TO RULE 144 UNDER THE 1933 ACT."
 
     (ii) The holder understands that it may be entitled to certain registration
rights pursuant to the Registration  Rights Agreement  aforementioned  which are
applicable  to its shares of Common Stock (and,  if  applicable,  other  Warrant
Securities).

     Section 4. Adjustment of Purchase Price. (i) As used herein:

          (1)  "Purchase  Price" at any time  shall  mean the price per share of
     Common Stock of the Company at which this Warrant shall then be exercisable
     (including the Initial  Purchase  Price) in accordance  with the provisions
     hereof.

          (2) The term "Shares" means, collectively,  shares of Common Stock (i)
     issued or issuable upon exercise of the Warrants and (ii) exchanged for, or
     distributed,  issued or issuable  with  respect to, the shares  included in
     clause (i) of this  definition.  In case by reason of the operation of this
     Section 4 this Warrant shall be  exercisable  for any other shares of stock
     or other securities or property of the Company or of any other corporation,
     any  reference  herein to the exercise of this  Warrant  shall be deemed to
     refer to and include the  exercise of this Warrant for such other shares of
     stock or other securities or property.

The  Purchase  Price and the number of shares of Common  Stock and the number or
amount of any other  securities and property as  hereinafter  provided for which
this Warrant may be exercisable shall be subject to adjustment from time to time
effective upon each occurrence of any of the following events.

     (ii) If the Company  shall  declare or pay any dividend with respect to its
Common Stock payable in Common Stock, subdivide the outstanding shares of Common
Stock into a greater  number of shares of Common Stock,  or reduce the number of
shares  of Common  Stock  outstanding  (by stock  split,  reverse  stock  split,
reclassification  or otherwise  than by  repurchase of its Common Stock) (any of
such events being  hereinafter  called a "Stock Split"),  the Purchase Price and
number of shares of Common Stock issuable upon exercise of this Warrant shall be
appropriately  adjusted  so as to  entitle  the holder  hereof to  receive  upon
exercise of this Warrant, for the same aggregate  consideration provided herein,
the same  number  of shares of Common  Stock  (plus  cash in lieu of  fractional
shares) as the holder  would have  received  as a result of such Stock Split had
such  holder  exercised  this  Warrant in full  immediately  prior to such Stock
Split.

     (iii) If the Company  shall merge or  consolidate  with or into one or more
corporations or partnerships and the Company is the sole surviving  corporation,
or the Company shall adopt a plan of recapitalization or reorganization in which
shares of Common Stock are exchanged for or changed

                                       -3-
<PAGE>

into another  class of stock or other  security or property of the Company,  the
holder of this Warrant  shall,  for the same  aggregate  consideration  provided
herein,  be entitled  upon  exercise  of this  Warrant to receive in lieu of the
number of shares of Common  Stock as to which this  Warrant  would  otherwise be
exercisable, the number of shares of Common Stock or other securities (plus cash
in lieu of  fractional  shares) or property to which such holder would have been
entitled   pursuant  to  the  terms  of  the   agreement   or  plan  of  merger,
consolidation, recapitalization or reorganization had such holder exercised this
Warrant   in   full   immediately   prior   to   such   merger,   consolidation,
recapitalization or reorganization.

     (iv) If the  Company  is  merged or  consolidated  with or into one or more
corporations or partnerships under circumstances in which the Company is not the
sole  surviving  corporation,  or if the Company sells or otherwise  disposes of
substantially  all  its  assets,   and  in  connection  with  any  such  merger,
consolidation  or sale  the  holders  of  Common  Stock  receive  stock or other
securities convertible into equity of the surviving or acquiring corporations or
entities,  or other  securities  or property  after the  effective  date of such
merger,  consolidation  or sale,  as the case may be, the holder of this Warrant
shall, for the same aggregate  consideration  provided herein,  be entitled upon
exercise  of this  Warrant to receive,  in lieu of shares of Common  Stock as to
which this Warrant would otherwise be exercisable, shares of such stock or other
securities (plus cash in lieu of fractional shares) or property as the holder of
this  Warrant  would  have  received  pursuant  to  the  terms  of  the  merger,
consolidation or sale had such holder exercised this Warrant in full immediately
prior to such merger,  consolidation or sale. In the event of any consolidation,
merger or sale as described in this Section  4(iv),  provision  shall be made in
connection therewith for the surviving or acquiring corporations or partnerships
to assume  all  obligations  and  duties of the  Company  hereunder  or to issue
substitute  warrants  in  lieu  of  this  Warrant  with  all  such  changes  and
adjustments  in the number or kind of shares of stock or  securities or property
thereafter subject to this Warrant or in the Purchase Price as shall be required
in connection with this Section 4(iv).

     (v) If the  Company  shall  declare  or  pay  any  dividend,  or  make  any
distribution,  with  respect  to its Common  Stock that is payable in  preferred
stock or other  securities,  cash, assets or rights to subscribe for or purchase
any security of the Company other than Common Stock,  or that is payable in debt
securities  of the Company  convertible  into Common Stock,  preferred  stock or
other equity  securities of the Company,  the holder hereof shall,  for the same
aggregate consideration provided herein, be entitled to receive upon exercise of
this  Warrant  in lieu of the shares of Common  Stock as to which  this  Warrant
would otherwise be exercisable, the same amount of Common Stock, preferred stock
and other  securities,  cash,  assets or rights to subscribe for or purchase any
security  (plus cash in lieu of  fractional  shares)  as the  holder  would have
received had the holder exercised this Warrant in full immediately  prior to any
such dividend or distribution.

     (vi) If the Company  (other than in  connection  with a sale  described  in
Section 4(iv)) proposes to liquidate and dissolve, the Company shall give notice
thereof as provided in Section 5(iii) hereof and shall permit the holder of this
Warrant to exercise any  unexercised  portion hereof at any time, if such holder
should  elect to do so,  and  participate  as a  stockholder  of the  Company in
connection with such dissolution.


                                       -4-
<PAGE>


     (vii) If the  Purchase  Price  shall fall below the par value of the Common
Stock,  the Company agrees to use its best efforts to  appropriately  adjust the
par value of the Common  Stock to an amount  less than or equal to the  Purchase
Price.

     (viii) In order to protect  each  Subscriber  against  the  dilution of its
interest in the Company, if and whenever on or after the date hereof the Company
issues or sells any Common Stock (except any Permitted  Issuance or any issuance
pursuant to Section 4(ii)) for a consideration  per share which is less than the
then Purchase Price (a "Special Issuance"), then forthwith upon such issuance or
sale the  number of Shares  (as  defined  in  Section  4(i)(2)),  as  determined
immediately prior to such Special  Issuance,  will be increased to equal the New
Warrant Shares (as defined  below),  and the Purchase Price will be equal to the
New Purchase Price, each as determined pursuant to the following formulas:

                      NWS  = S x ((OS + SI) divided by (OS + X))

                      NPP   = (OPP x S) divided by NWS

where:

     S     =   the Shares (as defined in Section 4(i)(2)), as determined
               immediately prior to such Special Issuance

     OS    =   the number of shares of Common Stock outstanding  immediately 
               prior to such Special  Issuance on a fully diluted basis without
               giving effect to such Special Issuance

     NWS   =   the number of Shares(as defined in Section 4(i)(2)),as determined
               immediately following the adjustment made by reason of this 
               Section 4(viii)("New Warrant Shares")

     SI   =    the  aggregate  number of shares of Common Stock issued or sold
               (or deemed issued or sold) in such Special Issuance

     X    =    the  number  of  shares  of  Common  Stock  that the aggregate
               cash consideration actually received by the Company for SI would
               purchase at OPP

     NPP  =    the "New Purchase Price"

     OPP  =    the Purchase Price in effect immediately prior to such Special
               Issuance

"Permitted  Issuances"  means any and all  issuances  of shares of Common  Stock
pursuant to (x) any stock option,  stock  purchase or other employee or director
benefit  plan of the  Company  and (y) any  warrant or other  right to  purchase
Common  Stock,  in each case  existing  as of the date  hereof and

                                       -5-
<PAGE>

specifically  disclosed in the  Company's  Form 10-KSB for the fiscal year ended
June 30, 1995 or on Exhibit C to the Warrant Agreement.

     (ix)  Whenever any  adjustment is made as provided in any provision of this
Section 4:

          (a) the Company shall compute the  adjustments in accordance with this
     Section 4 and shall prepare a  certificate  signed by the Senior  Financial
     Officer of the Company setting forth the adjusted number of shares or other
     securities or property and Purchase  Price,  as applicable,  and showing in
     reasonable  detail the facts upon which such adjustment is based,  and such
     certificate shall forthwith be filed with the Company or its designee; and

          (b) a notice  setting  forth  the  adjusted  number of shares or other
     securities  or  property  and the  Purchase  Price,  as  applicable,  shall
     forthwith be  required,  and as soon as  practicable  after it is prepared,
     such notice  shall be mailed by the Company to the holder of record of each
     Warrant  at  such  holder's  address  specified  pursuant  to  the  Warrant
     Agreement.

     (x) If at any time,  as a result of any  adjustment  made  pursuant to this
Section 4,  the holder of this Warrant  shall  become  entitled,  upon  exercise
hereof,  to receive any shares  other than shares of Common  Stock or to receive
any  other  securities,  the  number  of such  other  shares  or  securities  so
receivable  upon exercise of this Warrant  shall be subject to  adjustment  from
time to time in a manner and on terms as nearly equivalent as practicable to the
provisions contained in this Section 4 with respect to the Common Stock.

     (xi) All of the  events  requiring  adjustments  pursuant  to this  Warrant
Agreement are subject to such prohibitions,  limitations, restrictions and other
provisions  as set forth in the  Transaction  Documents,  as may be amended from
time to time.

     (xii) The Company may make such  increases  in the Shares and  decreases in
the Purchase  Price, in addition to those required or allowed by this Section 4,
as shall be  determined  by it, as evidenced by a  resolution  of the  Company's
Board of Directors, to be advisable in order to avoid or diminish any income tax
to holders of Common Stock  resulting from any dividend or distribution of stock
or issuance of rights or warrants to purchase or subscribe for stock or from any
event treated as such for income tax purposes.



                                       -6-
<PAGE>

     Section 5. Special Agreements of the Company.

     (i) The Company covenants and agrees that it will reserve and set apart and
have at all times a number of shares of  authorized  but  unissued  Common Stock
(and,  if  applicable,  other  Warrant  Securities)  then  deliverable  upon the
exercise of the Warrants or any other rights or privileges  provided for therein
sufficient to enable it at any time to fulfill all its  obligations  thereunder;
and if at any time the number of authorized but unissued  shares of Common Stock
shall not be  sufficient  to effect the exercise of this Warrant at the Purchase
Price then in effect, the Company will take such corporate action as may, in the
reasonable  opinion of its counsel,  be  necessary  to increase  its  authorized
shares but unissued  shares of Common Stock (and, if  applicable,  other Warrant
Securities) to such number of shares as shall be sufficient for such purposes.

     (ii)  Whenever the number of shares  purchasable  under this Warrant or the
Purchase  Price shall be adjusted  as  required by the  provisions  of Section 4
hereof,  the Company shall  forthwith  mail a notice  setting forth the adjusted
Purchase  Price and the adjusted  number of Shares (and,  if  applicable,  other
securities)  for which this Warrant is exercisable  to the registered  holder of
this Warrant at his last address as it shall appear on the  registration  books,
but failure to give or receive such notice shall not adversely affect the rights
of any holder of a Warrant.

     (iii) In case the Company  proposes,  to the extent then  permitted  by the
Transaction Documents,

          (a) to pay any  stock  dividend  upon  the  Common  Stock  or make any
     distribution  (other than ordinary cash dividends  payable out of earnings)
     or offer any  subscription  or other rights to the holders of Common Stock,
     or

          (b) to  effect  any  capital  reorganization  or  reclassification  of
     capital stock of the Company, or

          (c) to effect the consolidation,  merger, sale of all or substantially
     all of the assets,  liquidation,  dissolution or winding up of the Company,
     or
 
          (d) to take any other  action  that  would  result  in any  adjustment
     pursuant to Section 4 in the number of Shares or the Purchase Price,

then the Company shall cause notice of any such  intended  action to be given to
each holder of the  Warrants not less than 30 nor more than 60 days prior to the
date on which the transfer books of the Company shall close or a record be taken
for such dividend or distribution, or the date when such capital reorganization,
reclassification,  consolidation,  merger,  sale,  liquidation,  dissolution  or
winding up shall be effected,  or the date of such other event,  as the case may
be.

     Section 6. Notices.  Any notice or other document  required or permitted to
be given or  delivered  to holders of Warrants  and holders of Common  Stock (or
other Warrant Securities) shall


                                       -7-
<PAGE>

be in  writing  and sent (a) by  telecopy  if the sender on the same day sends a
confirming  copy of such  notice  by a  recognized  overnight  delivery  service
(charges  prepaid),  or (b) by registered or certified  mail with return receipt
requested  (postage prepaid) or (c) by a recognized  overnight  delivery service
(with charges prepaid).

          (i) if to the Company,  at Universal Seismic  Associates,  Inc., 16420
     Park Ten  Place,  Suite  300,  Houston,  Texas  77084-5051,  Telecopy  No.:
     713-578-7091,  or such  other  address as it shall  have  specified  to the
     Subscribers in writing; or

          (ii) if to a Subscriber,  at each of its addresses set forth below, or
     such other address as it shall have specified to the Company in writing.

Notices  given  under this  Section 6 shall be deemed  given only when  actually
received.

     Section 7. Limitation of Liability.  No provision hereof, in the absence of
affirmative action by the holder to purchase shares of Common Stock, and no mere
enumeration herein of the rights or privileges of the holder hereof,  shall give
rise to any liability of such holder for the Purchase  Price or as a stockholder
of the  Company,  whether  such  liability  is  asserted  by the  Company  or by
creditors of the Company.


                                       -8-
<PAGE>



     IN WITNESS WHEREOF, the Company has caused this Warrant to be signed in its
name by its duly authorized  officers and accepted by the holder of this Warrant
this 28th day of May, 1996.

                                            UNIVERSAL SEISMIC ASSOCIATES, INC.

                                            By:   
                                                  ------------------------- 
                                            Name:    Michael J. Pawelek
                                            Title:   President


Subscriber Name:


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

By:  Resources Investors Management
     Company Limited Partnership,
     its general partner

By:  RIMCO Associates, Inc.,
     its general partner

By:   
     ------------------------                                        
Name:  Gary Milavec
Title: Vice President

Addresses for Notices:

22 Waterville Road
Avon, Connecticut   06001
Telecopy No.:  213-678-9382

600 Travis Street - Suite 6875
Houston, Texas   77002
Telecopy No.:  713-247-0730
 


                                       -9-
<PAGE>

                                   ASSIGNMENT

                  TO BE EXECUTED BY THE REGISTERED HOLDER IF IT
                         DESIRES TO TRANSFER THE WARRANT

     FOR  VALUE  RECEIVED,  ______________________  hereby  sells,  assigns  and
transfers   unto   _______________________________   the   right   to   purchase
______________________  shares of ______________________ stock, evidenced by the
within   Warrant,   and  does   hereby   irrevocably   constitute   and  appoint
______________________ Attorney to transfer the said Warrant on the books of the
Company, with full power and substitution.


                                                     ------------------------ 
                                                     Signature



                                                     ------------------------ 
 
                                                     ------------------------ 
                                                     Address


Dated:  ______________________, 19____.

In the presence of:

_________________________________________________


                                     NOTICE

     The signature of the foregoing  Assignment  must  correspond to the name as
written  upon the  face of the  within  Warrant  in  every  particular,  without
alteration or enlargement or any change whatsoever.



                                      -10-

<PAGE>

                                SUBSCRIPTION FORM

                  TO BE EXECUTED BY THE REGISTERED HOLDER IF IT
                         DESIRES TO EXERCISE THE WARRANT

     The undersigned  hereby exercises the right to purchase  __________________
shares of stock covered by this Warrant according to the conditions  thereof and
herewith makes payment of the Purchase Price of such shares in full.


                                                     ------------------------ 
                                                     Signature


                                                     ------------------------ 
                                                     Name


                                                     ------------------------ 
                                                            
                                                     ------------------------
                                                     Address


Dated:  ____________________, 19_____.



                                      -11-
<PAGE>

                                                             EXHIBIT F
  
                                 [FORM OF NOTE]

                                  UNEXCO, INC.

             10% SENIOR SECURED EXCHANGEABLE GENERAL OBLIGATION NOTE

No. EN-_____                                                  January 19, 1996
$[___________________]

     FOR VALUE RECEIVED, the undersigned, UNEXCO, INC., a Texas corporation (the
"Company"), hereby promises to pay to _________________________________________,
or       registered       assigns,        the       principal       sum       of
_______________________________________  and ____/100  DOLLARS  ($____________),
together with interest (computed on the basis of a 360-day year of twelve 30-day
months) (a) on the unpaid  principal  balance  hereof at the rate of ten percent
(10%) per annum from the date  hereof,  until the  principal  hereof  shall have
become due and payable, and (b) on any overdue payment of principal or interest,
at a rate per annum from time to time equal to fifteen percent (15%);  provided,
however,  in no event shall such rate of interest ever exceed the Highest Lawful
Rate (as defined in the Note Purchase Agreement referred to below).

     This Note shall be due and payable as follows:

          (a)  commencing  on March 1, 1996,  on the first day of each month,  a
     payment equal to all accrued,  but unpaid  interest hereon shall be due and
     payable; and

          (b) on  February  1,  2002,  the  unpaid  principal  balance  hereof ,
     together with all accrued,  but unpaid interest hereon,  shall be fully and
     finally due and payable.

     This Note is one of a series of Senior  Notes  (herein  called the "Notes")
issued pursuant to the Note Purchase  Agreement dated as of January 19, 1996 (as
from time to time amended,  the "Note Purchase  Agreement")  between the Company
and the Noteholders named therein and is entitled to the benefits, and otherwise
subject  to  the  provisions,   thereof,  including,   without  limitation,  the
limitations on interest set forth in Section 13.05 thereof. This Note is secured
by the Security Documents referred to in the Note Purchase Agreement.

     This Note is exchangeable  for shares of common stock of Universal  Seismic
Associates,  Inc.  ("USA"),  the  parent  of the  Company,  upon the  terms  and
conditions  of the certain  Guaranty and Exchange  Agreement  dated of even date
herewith among USA, the Company and the Noteholders named therein.

     All payments  made by the Company on this Note shall be applied  first,  to
the accrued,  but unpaid interest  hereon,  and the remainder,  if any, shall be
applied to the principal balance hereof.  The Company does not have the right to
prepay this Note, in whole or in part, prior to maturity.
 
     Payments of principal of and interest on this Note are to be made in lawful
money of the United States of America at places  designated in the Note Purchase
Agreement.

<PAGE>

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

     If an Event of Default, as defined in the Note Purchase  Agreement,  occurs
and is  continuing,  the  principal  of this Note may be declared  or  otherwise
become due and payable in the manner,  at the price and with the effect provided
in the Note Purchase Agreement.

     This Note shall be governed by and construed in accordance with the laws of
the State of New York, excluding the choice of law rules thereof.

                                  UNEXCO, INC.


                                  By: 
                                          _________________________
                                  Name:    Ronald L. England
                                  Title:   Chief Financial Officer



                                     Page 2
<PAGE>

                                                          EXHIBIT G
                                                                         


                         GUARANTY AND EXCHANGE AGREEMENT

     GUARANTY  AND  EXCHANGE  AGREEMENT  dated  as of  January  19,  1996  among
UNIVERSAL SEISMIC  ASSOCIATES,  INC., a Delaware  corporation  ("USA"),  UNEXCO,
INC., a Delaware  corporation  (the  "Company"  and RIMCO  PARTNERS,  L.P. II, a
Delaware  limited  partnership,  RIMCO  PARTNERS,  L.P. III, a Delaware  limited
partnership,  and  RIMCO  PARTNERS,  L.P.  IV, a  Delaware  limited  partnership
(collectively, the "Noteholders").

                              PRELIMINARY STATEMENT

     The  Noteholders  have entered into a Note Purchase  Agreement  dated as of
January 19,  1996 (said  Agreement,  as it may hereafter be amended or otherwise
modified  from time to time,  being the "Note  Agreement")  with the Company,  a
wholly-owned subsidiary of USA. It is a condition precedent to the obligation of
the  Noteholders  to make advances  under the Note  Agreement that the Guarantor
shall have executed and delivered this  Agreement.  USA has  determined  that it
will receive a substantial benefit if advances are made to the Company under the
Note Agreement.

     In consideration of the mutual covenants herein contained, USA, the Company
and the Noteholders agree as follows:

                                    ARTICLE I
                                DEFINITIONS, ETC.

     Section  1.01.  Certain  Defined  Terms.  Capitalized  terms  used  in this
Agreement and not otherwise  defined herein shall have the  respective  meanings
set forth in the Note Agreement and the Annex A attached  thereto (such meanings
to be  equally  applicable  to both  singular  and  plural  forms  of the  terms
defined).

     Section 1.02. Covenant  Construction.  Each covenant contained herein shall
be construed  (absent express provision to the contrary) as being independent of
each other covenant  contained  herein, so that compliance with any one covenant
shall  not  (absent  such an  express  contrary  provision)  be deemed to excuse
compliance with any other covenant.  Where any provision herein refers to action
to be taken by any Person, or which such Person is prohibited from taking,  such
provision  shall  be  applicable  whether  such  action  is  taken  directly  or
indirectly by such Person.

     Section 1.03. Other Rules of Construction. The words "hereof," "herein" and
"hereunder"  and words of similar import when used in this Agreement shall refer
to  this  Agreement  as a  whole  and not to any  particular  provision  of this
Agreement. All references herein to articles,  sections,  annexes,  exhibits and
schedules shall, unless the context requires a different construction, be deemed
to be references to the articles and sections of this Agreement and the annexes,
exhibits


                                       -1-
<PAGE>

and schedules attached hereto and made a part hereof. In this Agreement,  unless
a clear contrary intention  appears,  the word "including" (and with correlative
meaning  "include")  means  including,  without  limiting the  generality of any
description  preceding  such term.  The  headings  of the various  articles  and
sections of this  Agreement  are for  convenience  only and shall not affect the
meaning of the terms and  conditions  of this  Agreement.  No  provision of this
Agreement  shall be  interpreted  or construed  against any party solely because
that party or its legal representative drafted such provision.

                                   ARTICLE II
                                    GUARANTY

     Section  2.01.  Guaranty.   USA  hereby   unconditionally  and  irrevocably
guarantees the full and punctual payment when due, whether at stated maturity or
earlier by  acceleration  or otherwise,  of any and all debts,  liabilities  and
obligations of the Company now or hereafter  existing under the Note  Agreement,
the Notes or any of the  other  Transaction  Documents  whether  for  principal,
interest  (including,  without  limitation,  all interest that accrues after the
commencement  of any proceeding by or against the Company under any  bankruptcy,
insolvency,  liquidation,  moratorium,  receivership,  reorganization  or  other
similar debtor relief law), fees,  expenses or otherwise (such obligations being
the "Obligations"),  and agrees to pay any and all reasonable costs and expenses
(including  counsel  fees and legal  expenses)  incurred by the  Noteholders  in
connection with the protection,  defense or enforcement of any rights under this
Agreement and any of the other Transaction Documents.

     Section 2.02. Guaranty Absolute.  USA  unconditionally  guarantees that the
Obligations  will be paid  strictly  in  accordance  with the  terms of the Note
Agreement, the Notes and the other Transaction Documents, regardless of any law,
regulation or order now or hereafter in effect in any jurisdiction affecting any
of such  terms or the  rights  of the  Noteholders  with  respect  thereto.  The
liability  of USA under  this  Agreement  shall be  absolute  and  unconditional
irrespective  of:  (a) any  lack  of  validity  or  enforceability  of the  Note
Agreement,  the Notes, the other Transaction Documents or any other agreement or
instrument  relating  thereto;  (b) any  change in the time,  manner or place of
payment of, or in any other term of, all or any of the Obligations, or any other
amendment or waiver of or any consent to departure from the Note Agreement,  the
Notes or the other Transaction Documents;  (c) any taking, exchange,  release or
non-perfection  of any  collateral,  or any release or amendment or waiver of or
consent to departure from any other guaranty, for all or any of the Obligations;
(d) any manner of application of collateral,  or proceeds thereof, to all or any
of the Obligations, or any manner of sale or other disposition of any collateral
for all or any of the  Obligations  or any other assets of the Company;  (e) any
change,  restructuring or termination of the corporate structure or existence of
the Company; or (f) any other  circumstances which might otherwise  constitute a
defense available to, or a discharge of, the Company or a guarantor.

     The  obligations  of USA  under  this  Agreement  shall not be  subject  to
reduction,  termination or other impairment by reason of any setoff, recoupment,
counterclaim  or defense or for any other  reason.  This  Agreement  is to be in
addition to and is not to prejudice or be prejudiced by


                                       -2-
<PAGE>

any other securities or guaranties  (including any guaranty signed by USA) which
the  Noteholders may now or hereafter hold from or on account of the Company and
is to be binding on USA as a continuing  security  notwithstanding  any payments
from  time to time made to the  Noteholders  or any  settlement  of  account  or
disability  or  incapacity  affecting  USA or any other thing  whatsoever.  This
Agreement  is a  continuing  guaranty  and shall remain in full force and effect
until payment in full of the  Obligations  and all other  amounts  payable under
this Agreement.

     Section 2.03. Waiver. USA hereby waives promptness,  diligence,  notice of
acceptance and any other notice with respect to any of the  Obligations and this
Agreement and any liability to which this  Agreement  applies or may apply,  and
waives presentment, demand of payment, notice of intent to accelerate, notice of
acceleration,  notice of dishonor or nonpayment,  and any  requirement  that the
Noteholders institute suit,  collection  proceedings or take any other action to
collect the Obligations  including any requirement that the Noteholders protect,
secure,  perfect or insure any security interest or lien or any property subject
thereto or exhaust any right or take any action against the Company or any other
person or entity or any  collateral  (it being the intention of the  Noteholders
and  USA  that  this  Agreement  is to be a  guaranty  of  payment  and  not  of
collection)  or that the  Company  or any other  person be joined in any  action
hereunder.  Notwithstanding the provisions of Section 8.13, USA hereby expressly
waives  each  and  every  right to which it may be  entitled  by  virtue  of the
suretyship laws of the State of Texas,  including,  without limitation,  any and
all  rights it may have  pursuant  to Rule 31 or Rule 32,  Texas  Rules of Civil
Procedure,  Section  17.001 of the Texas Civil  Practice and  Remedies  Code and
Chapter  34  of  the  Texas  Business  and  Commerce  Code.  USA  hereby  waives
marshalling  of assets and  liabilities,  sale in inverse  order of  alienation,
notice by the  Noteholders of any  indebtedness or liability to which it applies
or may apply any  amounts  received  by the  Noteholders,  and of the  creation,
advancement,  increase,  existence,  extension,  renewal,  rearrangement  and/or
modification of the Obligations.

     Section 2.04.  Waiver of Subrogation;  Etc. USA will not have any rights of
subrogation  under this  Agreement,  by any payment made hereunder or otherwise,
until  such  time  as  the  Noteholders   have  received  full  payment  of  the
Obligations,  and all such rights are hereby  waived.  If,  notwithstanding  the
preceding  sentence,  any amount shall be paid to USA on account of  subrogation
rights  at any time when all the  Obligations  shall not have been paid in full,
such amount shall be held in trust for the benefit of the  Noteholders and shall
forthwith  be paid to the  Noteholders  to be  credited  and  applied  upon  the
Obligations in accordance with the terms of the Note Agreement.

     USA hereby  subordinates all  indebtedness  owing to it from the Company to
all  indebtedness  of the Company to the  Noteholders,  and agrees that upon the
occurrence  and  continuance  of an Event of Default or any event which with the
giving of notice or lapse of time could become an Event of Default, it shall not
accept any  payment on the same until  payment in full of the  Obligations,  and
shall in no circumstance whatsoever attempt to set off or reduce any Obligations
hereunder  because of such  indebtedness.  USA further  subordinates any lien or
security interest that it has or may have on any collateral or security securing
payment of the Obligations to the liens and security interest on said collateral
and security in favor of the Noteholders, but the


                                       -3-
<PAGE>

foregoing  shall in no event  imply or be  construed  to imply the  Noteholders'
agreement or consent to the existence of any such security interests in favor of
USA.

     Section  2.05.  Right  of  Set-off.  Upon the  occurrence  and  during  the
continuance of any Event of Default the Noteholders are hereby authorized at any
time and from time to time, to the fullest  extent  permitted by law, to set off
and apply any and all deposits (general or special, time or demand,  provisional
or  final)  at any time held and  other  indebtedness  at any time  owing by the
Noteholders  to or for the credit or the  account of USA  against any and all of
the  obligations  of  USA  now  or  hereafter  existing  under  this  Agreement,
irrespective of whether or not the Noteholders  shall have made any demand under
this  Agreement and although such  obligations  may be contingent and unmatured.
The  Noteholders  agrees  promptly  to notify  USA after  any such  set-off  and
application,  provided that the failure to give such notice shall not affect the
validity of such set-off and  application.  The rights of the Noteholders  under
this Section are in addition to other rights and  remedies  (including,  without
limitation, other rights of set-off) which the Noteholders may have.

     Section 2.06. Transaction Documents.  USA acknowledges that it has full and
complete access to the Note Agreement,  the Notes and all other  instruments and
documents  executed by the Company,  or any other Person in connection  with the
Note Agreement, has fully reviewed same and is fully aware of their contents.

     Section 2.07.  Effect of Bankruptcy  Proceeding,  Etc. This Agreement shall
continue to be effective, or be automatically reinstated, as the case may be, if
at any time payment, in whole or in part, of any of the sums due any Noteholders
pursuant to the terms of the Note  Agreement  or  hereunder is rescinded or must
otherwise  be  restored  or returned  by the  Noteholders  upon the  insolvency,
bankruptcy, dissolution, liquidation or reorganization of the Company or USA, or
upon or as a result of the  appointment  of a  custodian,  receiver,  trustee or
other  officer  with  similar  powers with  respect to the Company or USA or any
substantial  part of their property,  or otherwise,  all as though such payments
had not been made. If an Event of Default shall at any time have occurred and be
continuing  and  declaration  of such  Event of  Default  shall at such  time be
prevented by reason of the pendency  against the Company of a case or proceeding
under a bankruptcy  or  insolvency  law,  USA agrees that,  for purposes of this
Agreement and its obligations  hereunder,  the Note Agreement shall be deemed to
have been declared in default with the same effect as if the Note  Agreement had
been declared in default in  accordance  with the terms  thereof,  and USA shall
forthwith pay the amounts  specified by the  Noteholders to be paid  thereunder,
any interest thereon and any other amounts guaranteed  hereunder without further
notice or demand.

     Section  2.08.  No  Waiver;  Remedies.  No  failure  on  the  part  of the
Noteholders to exercise,  and no delay in exercising,  any right hereunder shall
operate as a waiver  thereof;  nor shall any single or partial  exercise  of any
right hereunder  preclude any other or further  exercise thereof or the exercise
of any  other  right.  The  remedies  herein  provided  are  cumulative  and not
exclusive of any remedies provided by law.



                                       -4-
<PAGE>

     Section 2.09. Further Assurances.  USA hereby agrees to execute and deliver
all such  instruments  and take all such action as the Noteholders may from time
to time  reasonably  request in order to fully  effectuate  the  purpose of this
Agreement.

                                   ARTICLE III
                               EXCHANGE AGREEMENT

     Section 3.01.   Exchange.  (a) Each Noteholder shall have the right, at the
option of such holder at any time up to and  including  the maturity date of the
Notes, to exchange the outstanding principal balance of any Note (or any portion
thereof that is $1,000 or an integral multiple thereof), plus accrued and unpaid
interest due thereon to the effective date of the exchange,  into fully paid and
non-assessable  shares of common stock,  par value $.0001 per share, of USA (the
"USA Common  Stock"),  subject to possible  adjustment  as provided  below.  The
number of shares of USA Common  Stock  issuable in exchange  for a Note shall be
equal to the  quotient  of the  principal  amount of such  Note (or the  portion
thereof)  submitted for exchange plus accrued and unpaid interest due thereon to
the effective date of the exchange,  divided by the "Exchange Price" (as defined
below). As used herein,  the term "Exchange Price" shall mean the price of $3.77
per share,  or, in case an adjustment of such price has taken place  pursuant to
the provisions hereof, then at the price as last adjusted.

     (b) If at any time following the issuance of the Notes, the average closing
price per share of USA Common  Stock (as  reported by the  principal  securities
exchange or trading market, as the case may be, on which the USA Common Stock is
then traded) during a period of 20 consecutive trading days (such 20-day average
being  referred to herein as the "Average  Price") equals or exceeds 150% of the
Exchange  Price (a "Special  Exchange  Event"),  the Company  may, at its option
exercisable  in its  sole  discretion  at any  time  during  the  30-day  period
following  such  Special  Exchange  Event,  exchange all (but not less than all)
outstanding Notes, plus accrued and unpaid interest due thereon to the effective
date of such exchange,  into fully paid and non-assessable  shares of USA Common
Stock at the Exchange  Price then in effect.  Such  exchange  shall be deemed to
have been  effected  immediately  upon the mailing of the notice  referred to in
Section 3.02(b)  hereof,  which notice to be effective  must be deposited in the
mail on or prior to the close of business on the  thirtieth  day  following  the
Special Exchange Event,  whereupon the person or persons entitled to receive the
USA Common Stock  deliverable  upon such exchange shall thereupon be treated for
all purposes as the record holder or holders of such USA Common  Stock,  and the
Notes  shall be  deemed to  represent  only the  right to  receive  certificates
representing  the  number of shares of USA  Common  Stock,  plus cash in lieu of
fractional shares in accordance with Section 3.04,  for which each such Note has
been so exchanged. If the Company does not exchange the Notes in accordance with
this  Section 3.01(b)  within the 30-day period  following any Special  Exchange
Event, then a new period of trading days shall begin for purposes of determining
whether the Company may exchange the Notes pursuant to this Section 3.01(b).

     Section 3.02. Exchange Procedure. (a) If any Noteholder desires to exchange
any Note for USA Common Stock pursuant to Section  3.01(a) hereof or if any Note
has been exchanged


                                       -5-
<PAGE>

pursuant to Section 3.01(b) hereof, the holder of such Note shall surrender such
Note at the office of the Company,  duly endorsed to the Company or in blank, or
accompanied  by proper  instruments  of  transfer  to the  Company  or in blank,
accompanied,  in the case of a voluntary  exchange  pursuant to Section  3.01(a)
hereof,  by an irrevocable  written notice to the Company that the holder elects
so to exchange such Note in accordance with the terms hereof, and specifying the
name or names (with  address) in which a  certificate  or  certificates  for USA
Common Stock are to be issued.

     (b) If the Company  elects  pursuant to Section  3.01(b) hereof to exchange
the issued and outstanding Notes for USA Common Stock, the Company shall, within
30 days after the Special  Exchange Event with respect to which such election is
made,  send notice (or cause  notice to be sent) by first  class  mail,  postage
prepaid,  to each  holder of record of the  Notes at such  holder's  address  as
specified  pursuant to the Note  Agreement.  Each such notice of exchange  shall
specify the date such exchange was effected,  the Exchange  Price,  the Exchange
Rate (as defined in Section  3.03),  the place or places  that the  certificates
representing  the Notes shall be surrendered and that on and after such exchange
date, interest will cease to accrue on such Notes.

     (c) The Company will, as soon as practicable after such surrender of a Note
accompanied,  in the case of a voluntary  exchange  pursuant to  Section 3.01(a)
hereof, by the written notice specified in Section 3.02(a) hereof and compliance
with any other conditions herein contained, deliver or cause to be delivered, to
the Person for whose account such Note was so surrendered,  certificates for the
number of full shares of USA Common Stock to which such Person shall be entitled
upon exchange as aforesaid and a cash  adjustment for any fraction of a share of
USA Common  Stock as provided in  Section 3.04.  In the case of an exchange of a
Note pursuant to Section 3.01(a)  hereof,  such exchange shall be deemed to have
been made as of the date of such surrender of such Note, and the Person entitled
to receive the USA Common Stock  deliverable upon exchange of such Note shall be
treated for all  purposes as the record  holder of such USA Common Stock on such
date of surrender.

     Section 3.03.  Adjustments.  The Exchange Price and the number of shares of
USA Common Stock and the number or amount of any other  securities  and property
as hereinafter  provided into which a Note is exchangeable (the "Exchange Rate")
shall be subject to adjustment  from time to time effective upon each occurrence
of any of the following  events.  As used in this Section 3.03 the term "Shares"
means,  collectively,  shares of USA Common  Stock (i) issued or  issuable  upon
exchange of the Notes and (ii) exchanged for, or distributed, issued or issuable
with respect to, the shares included in clause (i) of this  definition.  In case
by reason of the operation of this  Section 3.03 the Notes shall be exchangeable
for any other shares of stock or other  securities  or property of USA or of any
other  corporation,  any reference  herein to the exchange of the Notes shall be
deemed to refer to and include the  exchange of the Notes for such other  shares
of stock or other securities or property.

     (a) If USA shall  declare or pay any  dividend  with  respect to USA Common
Stock  payable in USA Common  Stock,  subdivide  the  outstanding  shares of USA
Common Stock into a greater number of shares of USA Common Stock,  or reduce the
number of shares of USA Common


                                       -6-
<PAGE>

     Stock outstanding (by stock split, reverse stock split, reclassification or
otherwise  than by repurchase of its USA Common Stock) (any of such events being
hereinafter called a "Stock Split"),  the Exchange Price and number of shares of
USA Common  Stock  issuable  upon  exchange  of any Note shall be  appropriately
adjusted so as to entitle  the holder  thereof to receive  upon  exchange of its
Note, for the same aggregate  consideration  provided herein, the same number of
shares of USA  Common  Stock  (plus  cash in lieu of  fractional  shares) as the
holder  would  have  received  as a result of such Stock  Split had such  holder
exchanged such Note in full immediately prior to such Stock Split.

     (b) If USA shall merge or consolidate with or into one or more corporations
or partnerships and USA is the sole surviving corporation,  or USA shall adopt a
plan of  recapitalization  or reorganization in which shares of USA Common Stock
are exchanged  for or changed into another  class of stock or other  security or
property  of USA,  the holder of a Note,  for the same  aggregate  consideration
provided herein, shall be entitled upon exchange of such Note to receive in lieu
of the number of shares of USA Common Stock for which such Note would  otherwise
be  exchangeable,  the number of shares of USA Common Stock or other  securities
(plus cash in lieu of fractional  shares) or property to which such holder would
have been  entitled  pursuant to the terms of the  agreement  or plan of merger,
consolidation, recapitalization or reorganization had such holder exchanged such
Note in full immediately prior to such merger,  consolidation,  recapitalization
or reorganization.

     (c) If USA is merged or consolidated  with or into one or more corporations
or  partnerships  under  circumstances  in which  USA is not the sole  surviving
corporation,  or if USA sells or  otherwise  disposes of  substantially  all its
assets,  and in  connection  with any  such  merger,  consolidation  or sale the
holders of USA Common Stock receive stock or other  securities  convertible into
equity  of the  surviving  or  acquiring  corporations  or  entities,  or  other
securities or property,  after the effective date of such merger,  consolidation
or sale, as the case may be, the holder of a Note shall,  for the same aggregate
consideration provided herein, be entitled upon exchange of the Note to receive,
in lieu of shares of USA Common  Stock for which such Note  would  otherwise  be
exchangeable,  shares of such  stock or other  securities  (plus cash in lieu of
fractional  shares) or property  as the holder of such Note would have  received
pursuant  to the  terms of the  merger,  consolidation  or sale had such  holder
exchanged such Note in full immediately  prior to such merger,  consolidation or
sale.  In the event of any  consolidation,  merger or sale as  described in this
Section 3.03(c),  provision  shall  be  made  in  connection  therewith  for the
surviving or acquiring  corporations  or  partnerships to assume all obligations
and duties of USA hereunder.

     (d) If USA shall  declare or pay any  dividend,  or make any  distribution,
with respect to its USA Common Stock that is payable in preferred stock or other
securities,  cash, assets or rights to subscribe for or purchase any security of
USA other than USA Common  Stock,  or that is payable in debt  securities of USA
convertible into USA Common Stock, preferred stock or other equity securities of
USA, the holder of a Note shall, for the same aggregate  consideration  provided
herein,  be entitled to receive upon exchange of such Note in lieu of the shares
of USA Common  Stock for which such Note would  otherwise be  exchangeable,  the
same amount of USA Common


                                       -7-
<PAGE>

Stock, preferred stock and other securities, cash, assets or rights to subscribe
for or purchase any  security  (plus cash in lieu of  fractional  shares) as the
holder  would  have  received  had  the  holder  exchanged  such  Note  in  full
immediately prior to any such dividend or distribution.

     (e)  If  USA  (other  than  in   connection   with  a  sale   described  in
Section 3.03(c))  proposes  to  liquidate  and  dissolve,  USA shall give notice
thereof as provided in  Section 3.05(e)  hereof and shall permit the holder of a
Note to exchange any  unexchanged  portion  thereof at any time,  if such holder
should elect to do so, and  participate  as a  stockholder  of USA in connection
with such dissolution.

     (f) If the Exchange  Price shall fall below the par value of the USA Common
Stock, USA agrees to use its best efforts to appropriately  adjust the par value
of the USA Common Stock to an amount less than or equal to the Exchange Price.

     (g) In order to protect  each holder of a Note  against the dilution of its
interest in USA, if and whenever on or after the date hereof USA issues or sells
any USA Common Stock (except any Permitted  Issuance or any issuance pursuant to
Section  3.03(a))  for a  consideration  per  share  which is less than the then
Exchange Price (a "Special Issuance"), then forthwith upon such issuance or sale
the number of Shares (as defined in Section  3.03),  as  determined  immediately
prior to such  Special  Issuance,  will be  increased  to equal the New Exchange
Shares  (as  defined  below),  and the  Exchange  Price will be equal to the New
Exchange Price, each as determined pursuant to the following formulas:

                    NES = S x ((OS + SI) divided by (OS + X))

                         NEP = (OEP x S) divided by NES

where

   S    =    the Shares (as defined in Section 3.03), as determined immediately
             prior to such Special Issuance

   OS   =    the number of shares of USA Common Stock outstanding immediately
             prior to such Special  Issuance on a fully diluted basis without
             giving effect to such Special Issuance

   NES  =    the number of Shares (as defined in Section 3.03) as determined
             immediately following the aggregate adjustment made by reason of
             this Section 3.03(g)("New Exchange Shares")

   SI   =    the number of shares of USA Common Stock issued or sold (or deemed
             issued or sold) in such Special Issuance



                                       -8-
<PAGE>

   X    =    the number of shares of USA Common Stock that the aggregate cash
             consideration actually received by USA for SI would purchase at
             OEP

   NEP  =    the "New Exchange Price"

   OEP  =    the Exchange Price in effect immediately prior to such Special
             Issuance

"Permitted  Issuances" means any and all issuances of shares of USA Common Stock
pursuant to (x) any stock option,  stock  purchase or other employee or director
benefit  plan of USA and (y) any warrant or other  right to purchase  USA Common
Stock, in each case existing as of the date hereof and specifically disclosed in
USA's Form 10-KSB for the fiscal year ended June 30, 1995 or on Exhibit C to the
Warrant Agreement.

     (h)  Whenever  the  Exchange  Rate or the  Exchange  Price is  adjusted  as
provided in any provision of this Section 3.03:

     (i) the Company  shall  compute the  adjusted  Exchange  Rate and  Exchange
Price, as applicable,  in accordance with this  Section 3.03 and shall prepare a
certificate  signed by the Senior Financial Officer of the Company setting forth
the adjusted  Exchange Rate and Exchange  Price,  as applicable,  and showing in
reasonable  detail  the facts  upon which  such  adjustment  is based,  and such
certificate shall forthwith be filed with the Company or its designee; and

     (ii) a notice  stating that the Exchange  Rate and the Exchange  Price,  as
applicable,  has been adjusted and setting forth the adjusted  Exchange Rate and
the Exchange Price, as applicable,  shall forthwith be required,  and as soon as
practicable after it is prepared,  such notice shall be mailed by the Company to
the holder of record of each Note at such holder's address specified pursuant to
the Note Agreement.

     (i) If at any time, as a result of any adjustment to the Exchange Rate made
pursuant to this Section 3.03, the holder of any Note thereafter surrendered for
exchange shall become entitled to receive any shares of USA other than shares of
USA Common  Stock or to receive any other  securities,  the number of such other
shares or securities  so receivable  upon exchange of such Note shall be subject
to adjustment from time to time in a manner and on terms as nearly equivalent as
practicable to the provisions contained in this Section 3.03 with respect to the
USA Common Stock.

     (j) All of the events requiring  adjustments  pursuant to this Section 3.03
are subject to such prohibitions, limitations, restrictions and other provisions
as set forth in the Transaction Documents, as may be amended from time to time.

     Section 3.04. Cash in Lieu of Fractional  Shares.  No fractional  shares or
scrip  representing  fractional  shares of USA Common Stock shall be issued upon
the exchange of any


                                       -9-
<PAGE>

Note.  Instead of any fractional  share of USA Common Stock that would otherwise
be issuable upon exchange of a Note,  the Company will pay a cash  adjustment in
respect of such  fractional  interest in an amount equal to the same fraction of
the market  price per share of USA Common Stock (as  determined  by the Board of
Directors of the Company or in any manner  prescribed  by the Board of Directors
of the Company,  which shall be the last  reported  sale price of the USA Common
Stock on the principal  securities  exchange or trading  market on which the USA
Common  Stock is then traded) at the close of business on the business day prior
to the day of  surrender  of shares for  exchange or, in the case of an exchange
effected  pursuant to Section  3.01(b)  hereof,  the  business  day prior to the
effective date of such exchange.

     Section  3.05.  Additional  USA  Obligations.  (a) USA  shall at all  times
reserve and keep available, out of its authorized and unissued stock, solely for
the purpose of effecting the exchange of the Notes, such number of shares of USA
Common Stock free of preemptive  rights as shall from time to time be sufficient
to effect the  exchange  of all Notes from time to time  outstanding.  USA shall
from  time to  time,  in  accordance  with the  laws of the  State of  Delaware,
increase the authorized  number of shares of USA Common Stock if at any time the
number  of shares of USA  Common  Stock  authorized  but  unissued  shall not be
sufficient  to permit the  exchange of all the then  outstanding  Notes into USA
Common Stock at the Exchange Rate then in effect.

     (b) If any shares of USA Common Stock  required to be reserved for purposes
of  exchange  of  the  Notes  require  registration  with  or  approval  of  any
governmental  authority under any federal or state law before such shares may be
issued upon exchange,  USA will in good faith and as  expeditiously  as possible
endeavor to cause such shares to be duly registered or approved, as the case may
be. If the USA Common Stock is then traded on any national  securities  exchange
or trading  market,  USA will,  if  permitted  by the rules of such  exchange or
trading market, list and keep listed on such exchange or approved for trading on
such trading market,  subject to official notice of issuance,  all shares of USA
Common Stock issuable upon exchange of the Notes.

     (c) The  Company  will pay any and all  issue or  other  taxes  that may be
payable  in respect of any issue or  delivery  of shares of USA Common  Stock on
exchange of a Note. The Company shall not,  however,  be required to pay any tax
that may be payable in respect of any transfer involved in the issue or delivery
of USA Common Stock (or other  securities  or assets) in any name or names other
than that in which such Note was registered, and no such issue or delivery shall
be made  unless  and  until the  Person  requesting  such  issue has paid to the
Company  or its  designee  the  amount  of such tax or has  represented,  to the
reasonable satisfaction of the Company, that such tax has been paid.

     (d) Before taking any action that would cause an adjustment  increasing the
Exchange  Rate,  such that the effective  Exchange Price would be below the then
par or stated value of the USA Common Stock,  the Company and USA will take such
corporate action as may, in the opinion of counsel to the Company and counsel to
USA, be necessary in order that USA may validly and legally issue fully paid and
non-assessable shares of USA Common Stock at the Exchange Rate as so adjusted.


                                      -10-
<PAGE>

     (e) In case USA proposes,  to the extent then permitted by the  Transaction
Documents,

          (i) to pay any stock  dividend  upon the USA Common  Stock or make any
     distribution  (other than ordinary cash dividends  payable out of earnings)
     or offer any  subscription  or other  rights to the  holders  of USA Common
     Stock, or

          (ii) to effect  any  capital  reorganization  or  reclassification  of
     capital stock of USA, or

          (iii)  to  effect   the   consolidation,   merger,   sale  of  all  or
     substantially all of the assets, liquidation,  dissolution or winding up of
     USA, or
 
          (iv) to take any other  action  that  would  result in any  adjustment
     pursuant to Section 3.03 in the number of Shares or the Exchange Price,

then the Company shall cause notice of any such  intended  action to be given to
each  holder of the  Notes  not less than 30 nor more than 60 days  prior to the
date on which the  transfer  books of USA  shall  close or a record be taken for
such  dividend or  distribution,  or the date when such capital  reorganization,
reclassification,  consolidation,  merger,  sale,  liquidation,  dissolution  or
winding up shall be effected,  or the date of such other event,  as the case may
be.

     Section 3.06. Exchange Rate Increase. (a) The Company from time to time may
increase the Exchange Rate by any amount for any period of time if the period is
at least 20 days and if the increase is irrevocable during the period.  Whenever
the Exchange Rate is so  increased,  the Company shall mail to holders of record
of the  Notes a notice  of the  increase  at least 15 days  before  the date the
increased  Exchange Rate takes effect, and such notice shall state the increased
Exchange Rate and the period it will be in effect.

     (b) The Company may make such  increases in the Exchange  Rate, in addition
to those  required or allowed by this Article III, as shall be determined by it,
as  evidenced  by a  resolution  of the  Company's  Board  of  Directors,  to be
advisable  in order to avoid or diminish any income tax to holders of USA Common
Stock resulting from any dividend or distribution of stock or issuance of rights
or warrants to purchase or subscribe for stock or from any event treated as such
for income tax purposes.

                                   ARTICLE IV
                      REPRESENTATIONS AND WARRANTIES OF USA

     USA represents and warrants to the Noteholders that:

     Section 4.01. Organization;  Power and Authority. USA is a corporation duly
organized,  validly existing and in good standing under the laws of the State of
Delaware, and is duly


                                      -11-
<PAGE>

qualified as a foreign  corporation and is in good standing in each jurisdiction
in which such  qualification is required by law, other than those  jurisdictions
as to which the  failure  to be so  qualified  or in good  standing  could  not,
individually  or in the  aggregate,  reasonably  be  expected to have a Material
Adverse  Effect.  USA has the corporate power and authority to own or hold under
lease the  properties  it purports to own or hold under  lease,  to transact the
business it  transacts  and  proposes to  transact,  to execute and deliver this
Agreement  and the other  Transaction  Documents  and to perform the  provisions
hereof and thereof.

     Section 4.02. Authorization,  etc. This Agreement and the other Transaction
Documents  have been duly  authorized by all necessary  corporate  action on the
part of USA, and this  Agreement  constitutes,  and upon  execution and delivery
thereof each other  Transaction  Document will  constitute,  a legal,  valid and
binding obligation of USA enforceable  against USA in accordance with its terms,
except as such  enforceability  may be  limited  by (a)  applicable  bankruptcy,
insolvency,  reorganization,  moratorium  or other  similar laws  affecting  the
enforcement of creditors' rights generally and (b) general  principles of equity
(regardless  of whether such  enforceability  is  considered  in a proceeding in
equity or at law).

     Section 4.03. Compliance with Laws, Other Instruments,  etc. The execution,
delivery and  performance  by USA of this  Agreement  and the other  Transaction
Documents  will not  (a) contravene,  result in any breach of, or  constitute  a
default under,  or result in the creation of any Lien in respect of any property
of USA or any Subsidiary under, any indenture,  mortgage,  deed of trust,  loan,
purchase or credit agreement,  lease, corporate charter or by-laws, or any other
agreement or instrument to which USA or any  Subsidiary is bound or by which USA
or  any  Subsidiary  or any of  their  respective  properties  may be  bound  or
affected,  (b)  conflict  with  or  result  in a  breach  of any  of the  terms,
conditions or provisions of any order, judgment, decree, or ruling of any court,
arbitrator or Governmental  Authority applicable to USA or any Subsidiary or (c)
violate  any  provision  of any  statute  or  other  rule or  regulation  of any
Governmental Authority applicable to USA or any Subsidiary.

     Section 4.04.  Governmental  Authorizations,  etc. No consent,  approval or
authorization of, or registration,  filing or declaration with, any Governmental
Authority is required in connection with the execution,  delivery or performance
by USA of this Agreement or the other Transaction Documents.

     Section 4.05.  Subsidiaries.  Schedule  4.05 contains  complete and correct
lists of USA's Subsidiaries,  showing,  as to each Subsidiary,  the correct name
thereof,  the jurisdiction of its organization,  and the percentage of shares of
each class of its capital stock or similar equity interests outstanding owned by
USA and each other Subsidiary. No Subsidiary is a party to, or otherwise subject
to any  legal  restriction  or any  agreement  (other  than this  Agreement  and
customary limitations imposed by corporate law statutes) restricting the ability
of such  Subsidiary  to pay  dividends  out of profits or make any other similar
distributions of profits to USA or any of its Subsidiaries that owns outstanding
shares of capital stock or similar equity interests of such Subsidiary.


                                      -12-
<PAGE>

     Section 4.06. Financial  Statements.  The consolidated balance sheet of USA
and  its  Subsidiaries  as at  June  30,  1995,  and  the  related  consolidated
statements of income,  retained  earnings and cash flows for the 12-month period
then ended, copies of which USA has delivered to each Noteholder, fairly present
in all material  respects  the  consolidated  financial  position of USA and its
Subsidiaries as of such date and the  consolidated  results of their  operations
and cash flows for such period and have been  prepared in  accordance  with GAAP
consistently  applied throughout the periods involved except as set forth in the
notes thereto  (subject,  in the case of any interim  financial  statements,  to
normal year-end adjustments).

     Section 4.07. Disclosure.  This Agreement,  the documents,  certificates or
other writings delivered to the Noteholders by or on behalf of USA in connection
with the transactions  contemplated hereby and the financial statements referred
to in Section 4.06,  taken as a whole, do not contain any untrue  statement of a
material  fact or  omit  to  state  any  material  fact  necessary  to make  the
statements  therein  not  misleading.  Except  as  disclosed  in  the  financial
statements  referred to in Section 4.06, since June 30,  1995, there has been no
change in the financial condition, operations, business, properties or prospects
of USA or any Subsidiary  except changes that  individually  or in the aggregate
could not reasonably be expected to have a Material Adverse Effect.  There is no
fact known to USA that could  reasonably be expected to have a Material  Adverse
Effect  that  has  not  been  set  forth  herein  or  in  the  other  documents,
certificates and other writings (including the financial  statements referred to
in  Section 4.06)   delivered  to  the  Noteholders  by  or  on  behalf  of  USA
specifically for use in connection with the transactions contemplated hereby.

     Section 4.08.  Litigation.  Except as disclosed in Schedule 4.08, there are
no actions, suits or proceedings pending or, to the knowledge of USA, threatened
against  or  affecting  USA or any  Subsidiary  or  any  property  of USA or any
Subsidiary in any court or before any arbitrator of any kind or before or by any
Governmental Authority that, individually or in the aggregate,  could reasonably
be expected to have a Material Adverse Effect.

     Section 4.09.  Observance of Agreements,  Statutes and Orders.  Neither USA
nor any  Subsidiary  is in default under any term of any agreement or instrument
to which it is a party or by which it is bound, or any order,  judgment,  decree
or ruling of any court,  arbitrator or Governmental Authority or is in violation
of  any  applicable  law,  ordinance,  rule  or  regulation  (including  without
limitation  Environmental Laws) of any Governmental Authority,  which default or
violation,  individually  or in the aggregate,  could  reasonably be expected to
have a Material Adverse Effect.

     Section 4.10.  Taxes. USA and its  Subsidiaries  have filed all tax returns
that are  required  to have been  filed in any  jurisdiction,  and have paid all
taxes  shown to be due and  payable  on such  returns  and all  other  taxes and
assessments levied upon them or their properties,  assets, income or franchises,
to the extent such taxes and assessments  have become due and payable and before
they have become delinquent, except for any taxes and assessments (i) the amount
of which is not  individually or in the aggregate  Material or (ii) the  amount,
applicability or validity of which is currently being contested in good faith by
appropriate proceedings and with respect to which USA


                                      -13-
<PAGE>

or a  Subsidiary,  as the case may be,  has  established  adequate  reserves  in
accordance  with  GAAP.  USA knows of no basis  for any other tax or  assessment
that,  if imposed,  could  reasonably  be  expected  to have a Material  Adverse
Effect.  The  charges,  accruals  and  reserves  on the  books  of USA  and  its
Subsidiaries in respect of Federal,  state or other taxes for all fiscal periods
are adequate in all respects.  The Federal income tax liabilities of USA and its
Subsidiaries  have been determined by the Internal  Revenue Service and paid for
all fiscal years up to and including the fiscal year ended June 30, 1995.

     Section 4.11.  Title to Property.  USA and its  Subsidiaries  have good and
sufficient  title to their  respective  properties  that  individually or in the
aggregate are  Material,  including  all such  properties  reflected in the most
recent  audited  balance sheet  referred to in Section 4.06 or purported to have
been  acquired by USA or any  Subsidiary  after said date, in each case free and
clear of Liens other than those  permitted  by this  Agreement.  All leases that
individually  or in the aggregate are Material are valid and  subsisting and are
in full force and effect in all material respects.

     Section  4.12.  Licenses,  Permits,  etc. USA and its  Subsidiaries  own or
possess all licenses, permits, franchises, authorizations,  patents, copyrights,
service marks,  trademarks and trade names, or rights thereto, that individually
or in the  aggregate are  Material,  without  known  conflict with the rights of
others.  To the best  knowledge of USA,  (a) no  product of USA infringes in any
material  respect  any  license,  permit,  franchise,   authorization,   patent,
copyright, service mark, trademark, trade name or other right owned by any other
Person; and (b) there is no Material violation by any Person of any right of USA
or any of its Subsidiaries with respect to any patent, copyright,  service mark,
trademark,  trade  name  or  other  right  owned  or  used  by USA or any of its
Subsidiaries.

     Section 4.13. Compliance with ERISA.

     (a) USA and each ERISA Affiliate have operated and  administered  each Plan
in  compliance   with  all   applicable   laws  except  for  such  instances  of
noncompliance  as have not resulted in and could not  reasonably  be expected to
result in a Material  Adverse  Effect.  Neither USA nor any ERISA  Affiliate has
incurred  any  liability  pursuant  to Title I or IV of ERISA or the  penalty or
excise tax provisions of the Code relating to employee benefit plans (as defined
in section 3 of ERISA),  and no event,  transaction or condition has occurred or
exists that could reasonably be expected to result in the incurrence of any such
liability by USA or any ERISA Affiliate, or in the imposition of any Lien on any
of the rights,  properties  or assets of USA or any ERISA  Affiliate,  in either
case  pursuant  to Title I or IV of  ERISA  or to such  penalty  or  excise  tax
provisions  or to  Section  401(a)(29)  or 412  of the  Code,  other  than  such
liabilities or Liens as would not be individually or in the aggregate Material.

     (b) The present value of the aggregate  benefit  liabilities  under each of
the Plans (other than  Multiemployer  Plans),  determined  as of the end of such
Plan's most recently  ended plan year on the basis of the actuarial  assumptions
specified for funding  purposes in such Plan's most recent  actuarial  valuation
report, did not exceed the aggregate current value of the assets of such Plan


                                      -14-
<PAGE>

allocable to such benefit  liabilities.  The term "benefit  liabilities" has the
meaning  specified  in section 4001 of ERISA and the terms  "current  value" and
"present value" have the meaning specified in section 3 of ERISA.

     (c) USA and its ERISA Affiliates have not incurred  withdrawal  liabilities
(and are not subject to contingent withdrawal liabilities) under section 4201 or
4204 of ERISA in respect of  Multiemployer  Plans  that  individually  or in the
aggregate are Material.

     (d) The expected  post-retirement  benefit obligation (determined as of the
last day of USA's most recently  ended fiscal year in accordance  with Financial
Accounting  Standards  Board  Statement No. 106,  without  regard to liabilities
attributable to continuation  coverage mandated by section 4980B or the Code) of
USA and its Subsidiaries is not Material.

     Section 4.14. Status under Certain Statutes. Neither USA nor any Subsidiary
is subject to regulation  under the Investment  Company Act of 1940, as amended,
the Public  Utility  Holding  Company Act of 1935,  as amended,  the  Interstate
Commerce Act, as amended, or the Federal Power Act, as amended.

     Section 4.15. Capitalization.  The authorized capital stock of USA consists
solely of  20,000,000  shares of $.0001 par  common  stock,  of which  4,202,498
shares are issued and outstanding.

     Section 4.16.  Environmental  Matters.  Neither USA nor any  Subsidiary has
knowledge  of any  claim  or has  received  any  notice  of  any  claim,  and no
proceeding  has been  instituted  raising  any claim  against  USA or any of its
Subsidiaries  or any of their  respective real properties now or formerly owned,
leased or operated by any of them or other  assets,  alleging  any damage to the
environment or violation of any Environmental  Laws,  except, in each case, such
as could not  reasonably  be  expected to result in a Material  Adverse  Effect.
Except as otherwise disclosed to the Noteholders in writing, (a) neither USA nor
any  Subsidiary  has  knowledge of any facts which would give rise to any claim,
public  or  private,  of  violation  of  Environmental  Laws  or  damage  to the
environment  emanating  from,  occurring  on or  in  any  way  related  to  real
properties now or formerly owned,  leased or operated by any of them or to other
assets or their use,  except,  in each  case,  such as could not  reasonably  be
expected to result in a Material Adverse Effect;  (b) neither USA nor any of its
Subsidiaries  has stored  any  Hazardous  Materials  on real  properties  now or
formerly  owned,  leased or operated by any of them and has not  disposed of any
Hazardous  Materials in a manner contrary to any Environmental Laws in each case
in any manner that could  reasonably be expected to result in a Material Adverse
Effect;  and (c) all  buildings  on all real  properties  now  owned,  leased or
operated by USA or any of its  Subsidiaries  are in compliance  with  applicable
Environmental  Laws,  except  where  failure to comply could not  reasonably  be
expected to result in a Material Adverse Effect.




                                      -15-

<PAGE>
                                    ARTICLE V
                            INFORMATION AS TO COMPANY

     Section 5.01. Financial and Business Information. USA shall deliver to each
of the Noteholders:

     (a) Within 45 days after the end of each  quarterly  fiscal  period in each
fiscal year of USA,  copies of (i) a  consolidated  balance sheet of USA and its
Subsidiaries as at the end of such quarter, and (ii) consolidated  statements of
income,  changes  in  shareholders'  equity  and  cash  flows  of  USA  and  its
Subsidiaries,  for such  quarter  and for the  portion of the fiscal year ending
with such quarter,  setting forth in each case in  comparative  form the figures
for the  corresponding  periods in the previous  fiscal year,  all in reasonable
detail,  prepared in  accordance  with GAAP  applicable  to quarterly  financial
statements  generally,  and  certified by a Senior  Financial  Officer of USA as
fairly  presenting,  in all material  respects,  the  financial  position of the
companies  being  reported on and their  results of  operations  and cash flows,
subject to changes resulting from year-end adjustments.

     (b)  Within 90 days  after the end of each  fiscal  year of USA,  copies of
(i) a consolidated  balance sheet of USA and its Subsidiaries,  as at the end of
such year, and (ii) consolidated  statements of income, changes in shareholders'
equity and cash flows of USA and its Subsidiaries,  for such year, setting forth
in each case in comparative  form the figures for the previous  fiscal year, all
in reasonable  detail,  prepared in accordance with GAAP, and accompanied (A) by
an opinion  thereon of independent  certified  public  accountants of recognized
national  standing,  which  opinion shall state that such  financial  statements
present  fairly,  in  all  material  respects,  the  financial  position  of the
companies being reported upon and their results of operations and cash flows and
have been prepared in conformity  with GAAP,  and that the  examination  of such
accountants  in  connection  with  such  financial  statements  has been made in
accordance  with  generally  accepted  auditing  standards,  and that such audit
provides a  reasonable  basis for such opinion in the  circumstances,  and (B) a
certificate of such  accountants  stating that they have reviewed this Agreement
and stating further  whether,  in making their audit,  they have become aware of
any  condition or event that then  constitutes a Default or an Event of Default,
and, if they are aware that any such condition or event then exists,  specifying
the nature and period of the existence thereof.

     (c) Within 25 days after the end of each  calendar  month,  copies of (i) a
consolidated  balance  sheet of USA and its  Subsidiaries  as at the end of such
month,  and  (ii) consolidated  statements of income,  changes in  shareholders'
equity  and cash flows of USA and its  Subsidiaries,  for such month and for the
portion of the fiscal year ending with such month, setting forth in each case in
comparative  form the  figures  for the  corresponding  periods in the  previous
fiscal  year,  all in  reasonable  detail,  prepared  in  accordance  with  GAAP
applicable to monthly financial statements generally,  and certified by a Senior
Financial Officer of USA as fairly  presenting,  in all material  respects,  the
financial  position of the  companies  being  reported  on and their  results of
operations  and  cash  flows,   subject  to  changes   resulting  from  year-end
adjustments.



                                      -16-
<PAGE>

     (d) Promptly upon their becoming available,  one copy of (i) each financial
statement,  report,  notice or proxy  statement sent by USA or any Subsidiary to
public securities holders  generally,  and (ii) each regular or periodic report,
each registration  statement (without exhibits except as expressly  requested by
such holder), and each prospectus and all amendments thereto filed by USA or any
Subsidiary with the Securities and Exchange Commission and of all press releases
and other  statements  made available  generally by USA or any Subsidiary to the
public concerning developments that are Material.

     (e) Promptly, and in any event within five days after a Responsible Officer
of USA becoming  aware of any of the  following,  a written notice setting forth
the  nature  thereof  and the  action,  if any,  that USA or an ERISA  Affiliate
proposes  to take with  respect  thereto:  (i) with  respect  to any  Plan,  any
reportable  event,  as defined in  section 4043(b)  of ERISA and the regulations
thereunder,  for which  notice  thereof  has not been  waived  pursuant  to such
regulations  as in effect on the date hereof;  or (ii) the taking by the PBGC of
steps  to  institute,  or the  threatening  by the PBGC of the  institution  of,
proceedings  under  section 4042  of  ERISA  for  the  termination  of,  or  the
appointment of a trustee to  administer,  any Plan, or the receipt by USA or any
ERISA Affiliate of a notice from a Multiemployer  Plan that such action has been
taken by the PBGC with respect to such  Multiemployer  Plan; or (iii) any event,
transaction or condition that could result in the incurrence of any liability by
USA or any ERISA Affiliate  pursuant to Title I or IV of ERISA or the penalty or
excise tax provisions of the Code relating to employee  benefit plans, or in the
imposition of any Lien on any of the rights,  properties or assets of USA or any
ERISA Affiliate pursuant to Title I or IV of ERISA or such penalty or excise tax
provisions,  if such  liability  or Lien,  taken  together  with any other  such
liabilities or Liens then existing, could reasonably be expected to be Material.

     (f) Promptly, and in any event within 30 days of receipt thereof, copies of
any  notice to USA or any  Subsidiary  from any  Federal  or state  Governmental
Authority relating to any order, ruling, statute or other law or regulation that
could reasonably be expected to have a Material Adverse Effect; and

     (g) With reasonable promptness, such other data and information relating to
the business, operations,  affairs, financial condition, assets or properties of
USA or any of its  Subsidiaries or relating to the ability of USA to perform its
obligations hereunder and under the Notes as from time to time may be reasonably
requested by any of Noteholder.

     Section  5.02.  Officer's  Certificate.  Each set of  financial  statements
delivered to a holder of Notes pursuant to Section  5.01(a),  Section 5.01(b) or
Section  5.01(c) shall be  accompanied  by a certificate  of a Senior  Financial
Officer  of  USA  setting  forth:  (a)  the  information   (including   detailed
calculations)  required in order to establish whether USA was in compliance with
the requirements of Section 7.03 hereof during the monthly,  quarterly or annual
period covered by the statements then being furnished (including with respect to
each such Section, where applicable,  the calculations of the maximum or minimum
amount, ratio or percentage,  as the case may be, permissible under the terms of
such Sections,  and the  calculation of the amount,  ratio or percentage then in
existence);  and (b) a statement  that such  officer has  reviewed  the relevant
terms hereof and


                                      -17-

<PAGE>

has made, or caused to be made,  under his or her  supervision,  a review of the
transactions  and conditions of USA and its  Subsidiaries  from the beginning of
the monthly,  quarterly or annual period  covered by the  statements  then being
furnished  to the date of the  certificate  and that such review  shall not have
disclosed  the  existence  during  such  period of any  condition  or event that
constitutes a Default or an Event of Default or, if any such  condition or event
existed or exists (including,  without  limitation,  any such event or condition
resulting  from  the  failure  of USA or  any  Subsidiary  to  comply  with  any
Environmental  Law),  specifying the nature and period of existence  thereof and
what action USA shall have taken or proposes to take with respect thereto.

     Section  5.03.  Inspection.  USA shall permit the  representatives  of each
Noteholder,  at the expense of USA and upon  reasonable  prior notice to USA, to
visit and inspect any of the offices or properties of USA or any Subsidiary,  to
examine  all their  respective  books of  account,  records,  reports  and other
papers, to make copies and extracts  therefrom,  and to discuss their respective
affairs,  finances and accounts with their  respective  officers and independent
public  accountants  (and by this provision USA authorizes  said  accountants to
discuss the affairs, finances and accounts of USA and its Subsidiaries),  all at
such times and as often as may be requested.

                                   ARTICLE VI
                              AFFIRMATIVE COVENANTS

     USA covenants  that so long as any of the  Commitments  remain in effect or
any of the Notes are outstanding:

     Section 6.01. Compliance with Law; Contracts. USA will, and will cause each
of its Subsidiaries to, comply with all laws,  ordinances or governmental  rules
or regulations to which each of them is subject, including,  without limitation,
Environmental  Laws,  and will  obtain  and  maintain  in effect  all  licenses,
certificates,   permits,   franchises  and  other  governmental   authorizations
necessary to the ownership of their  respective  properties or to the conduct of
their respective businesses, in each case to the extent necessary to ensure that
non-compliance  with such laws,  ordinances or governmental rules or regulations
or  failures  to  obtain or  maintain  in effect  such  licenses,  certificates,
permits,   franchises   and  other   governmental   authorizations   could  not,
individually  or in the  aggregate,  reasonably  be  expected to have a Material
Adverse  Effect.  USA will, and will cause each of its  Subsidiaries  to, comply
with, and perform their respective obligations under, each contract or agreement
to which each is a party, unless, in the good faith judgment of USA, the failure
to so comply or perform  could not  reasonably  be  expected  to have a Material
Adverse Effect.

     Section 6.02. Insurance.  USA will, and will cause each of its Subsidiaries
to, maintain,  with  financially  sound and reputable  insurers,  insurance with
respect to their  respective  properties and businesses  against such casualties
and  contingencies,  of such types, on such terms and in such amounts (including
deductibles,   co-insurance  and   self-insurance,   if  adequate  reserves  are
maintained  with  respect  thereto) as is  customary  in the case of entities of
established reputations


                                      -18-

<PAGE>

engaged in the same or a similar business and similarly situated,  including the
insurance described in Schedule 6.02.

     Section 6.03.  Maintenance of Properties.  USA will, and will cause each of
its  Subsidiaries  to,  maintain and keep, or cause to be  maintained  and kept,
their respective  properties in good repair,  working order and condition (other
than  ordinary  wear and tear),  so that the business  carried on in  connection
therewith  may be properly  conducted at all times,  provided  that this Section
shall not prevent USA or any Subsidiary from discontinuing the operation and the
maintenance of any of its properties if such  discontinuance is desirable in the
conduct of its business and USA has  concluded  that such  discontinuance  could
not, individually or in the aggregate, reasonably be expected to have a Material
Adverse Effect.
 
     Section 6.04. Payment of Taxes and Claims. USA will, and will cause each of
its  Subsidiaries  to,  file  all  tax  returns  required  to be  filed  in  any
jurisdiction  and to pay and  discharge all taxes shown to be due and payable on
such returns and all other taxes,  assessments,  governmental charges, or levies
imposed on them or any of their properties, assets, income or franchises, to the
extent  such taxes and  assessments  have become due and payable and before they
have become delinquent and all claims for which sums have become due and payable
that  have  or  might  become  a Lien  on  properties  or  assets  of USA or any
Subsidiary,  provided that neither USA nor any Subsidiary  need pay any such tax
or assessment or claims if (i) the amount,  applicability or validity thereof is
contested  by USA or such  Subsidiary  on a timely  basis in good  faith  and in
appropriate  proceedings,  and  USA or a  Subsidiary  has  established  adequate
reserves therefor in accordance with GAAP on the books of USA or such Subsidiary
or (ii) the  nonpayment of all such taxes and assessments in the aggregate could
not reasonably be expected to have a Material Adverse Effect.

     Section 6.05. Corporate Existence,  etc. USA will at all times preserve and
keep in full  force and effect its  corporate  existence.  USA will at all times
preserve  and keep in full force and effect the  corporate  existence of each of
its  Subsidiaries  and all rights  and  franchises  of USA and its  Subsidiaries
unless,  in the good faith  judgment of USA,  the  termination  of or failure to
preserve and keep in full force and effect such  corporate  existence,  right or
franchise could not, individually or in the aggregate, reasonably be expected to
have a Material Adverse Effect.



                                      -19-

<PAGE>

                                   ARTICLE VII
                               NEGATIVE COVENANTS

     USA covenants  that so long as any of the  Commitments  remain in effect or
any of the Notes are outstanding:

     Section  7.01.  Restrictions  on  Indebtedness.  USA will not, and will not
permit any Subsidiary to, create, incur, assume, Guaranty or permit to exist any
Indebtedness, except:

          (a) the Notes;

          (b) the USA Notes;

          (c) Indebtedness outstanding under the Fidelity Funding Agreement;

          (d) Indebtedness in the amount of $134,635.55 owing to GeoCenter, Inc.
     and  Indebtedness  in the amount of $160,978.25  owing to Sentry  Financial
     Corporation.
 
     Section 7.02.  Restrictions on Liens. USA will not, and will not permit any
Subsidiary to, create,  incur,  assume, or permit to exist any Lien with respect
to any asset now owned or hereafter acquired, except:

          (a) Liens in favor of the Noteholders;

          (b) Liens existing on the date hereof and described on Schedule 7.02;

          (c) Liens in favor of the Noteholders under the USA Note Agreement;

          (d)  encumbrances  consisting  of  easements of ingress or egress over
     real  property,  where the same do not  materially  detract from the use or
     enjoyment of such property by, or the value of such property to, USA;

          (e) Liens for taxes or assessments or governmental  charges or levies,
     if payment shall not at the time be required to be made in accordance  with
     the provisions of Section 6.04;

          (f) any  judgment  lien,  unless the  judgment  it secures  shall not,
     within 30 days after the entry thereof,  have been  discharged or execution
     thereof stayed pending appeal,  or shall not have been discharged within 30
     days after the expiration of any such stay;

          (g) statutory liens of landlords and liens of carriers,  warehousemen,
     mechanics,  laborers and  materialmen  incurred in the  ordinary  course of
     business for sums not yet due or being contested in good faith; and



                                      -20-
<PAGE>

          (h) Liens (other than liens created by section 4068 of ERISA) incurred
     on  pledges  or  deposits  made  in the  ordinary  course  of  business  in
     connection  with workmen's  compensation,  unemployment  insurance,  social
     security laws or similar legislation.

     Section 7.03. Financial Covenants. USA will not permit:

          (a) its Current  Assets at any time prior to September  30, 1996 to be
     less than 75% of the sum of (i) its  Current  Liabilities  as at such date,
     minus (ii) any  portion of such Current  Liabilities  consisting of amounts
     outstanding  under the Fidelity  Funding  Agreement that are not due within
     one year of such date;

          (b) its Current Assets at any time on or after September 30 1996 to be
     less than the sum of (i) its  Current  Liabilities  as at such date,  minus
     (ii) any portion of such Current  Liabilities  consisting  of amounts under
     the  Fidelity  Funding  Agreement  that are not due within one year of such
     date;

          (c) its Tangible Net Worth at any time prior to September 30,  1996 to
     be less than $6,000,000 and at any time on or after  September 30,  1996 to
     be less than $7,000,000;

          (d) the sum,  determined  as of the last  day of each  calendar  month
     prior to September, 1996, of (i) its Net Income for the twelve month period
     then ended,  plus (ii) any interest  expense deducted in the calculation of
     Net Income for such twelve month period,  plus (iii) any  depreciation  and
     amortization  expense  deducted in the  calculation  of Net Income for such
     twelve month  period,  plus (iv) any Federal  income taxes  deducted in the
     calculation  of Net Income for such twelve  month  period,  to be less than
     $2,000,000;

          (e) the sum,  determined  as of the last  day of each  calendar  month
     prior to September, 1996, of (i) its Net Income for the twelve month period
     then ended,  plus (ii) any interest  expense deducted in the calculation of
     Net Income for such twelve month period,  plus (iii) any  depreciation  and
     amortization  expense  deducted in the  calculation  of Net Income for such
     twelve month  period,  plus (iv) any Federal  income taxes  deducted in the
     calculation  of Net Income for such twelve  month  period,  to be less than
     $2,500,000; and

          (f) the  ratio  of (i) the  Collateral  Liquidation  Value to (ii) the
     outstanding  principal balance of the Senior Notes, to be less than 1.75 to
     1.0 at any time.

     Section  7.04.   Restricted   Payments.   Except  as  contemplated  by  the
Transaction  Documents,  the USA Note Agreement and the documents and agreements
contemplated thereby, USA will not, and will not permit any Subsidiary, directly
or  indirectly,  to make or pay (a) any  dividend or other  distribution  on any
shares of USA's capital  stock  (including  any  dividends  payable in shares of
capital  stock),  (b) any  payment  on  account  of  the  purchase,  redemption,
retirement  or  acquisition  of any shares of USA's capital stock or any option,
warrant or other  right to acquire  such  shares,  or (c) any  payments or other
distributions to Sierra Management, Inc.


                                      -21-

<PAGE>

     Section 7.05. Merger, Consolidation, etc. USA shall not consolidate with or
merge with any other  Person or convey,  transfer or lease all or  substantially
all of its  assets in a single  transaction  or series  of  transactions  to any
Person.

     Section  7.06.  Restrictions  on Asset  Sales.  USA will not,  and will not
permit any Subsidiary to, sell, transfer, assign, convey or otherwise dispose of
an interest in any asset now owned or hereafter acquired.

     Section  7.07.  Transactions  with  Affiliates.  USA will not, and will not
permit any  Subsidiary  to,  enter into  directly  or  indirectly  any  Material
transaction  or  Material  group  of  related  transactions  (including  without
limitation  the purchase,  lease,  sale or exchange of properties of any kind or
the  rendering of any  service)  with any  Affiliate  (other than USA or another
Subsidiary),  except in the  ordinary  course  and  pursuant  to the  reasonable
requirements of USA's or such Subsidiary's business and upon fair and reasonable
terms no less favorable to USA or such  Subsidiary than would be obtainable in a
comparable arm's-length transaction with a Person not an Affiliate.

     Section 7.08.  Change in Business.  Except for oil and gas  exploration and
production operations to be conducted by the Company, USA will not, and will not
permit any of its Subsidiaries  to, directly or indirectly  engage to a material
extent in any business other than those in which it is presently engaged or that
are directly  related  thereto,  or  discontinue  any of its  existing  lines of
business or substantially  alter its method of doing business.  Without limiting
the  generality  of the  foregoing,  USA and its  Subsidiaries  (other  than the
Company)  shall  not  engage  in any  oil  and gas  exploration  and  production
operations or business.

     Section 7.09. Fidelity Funding Agreement. Without the prior written consent
of the  Noteholders,  USA will not, and will not permit any of its  Subsidiaries
to, amend, modify or extend the Fidelity Funding Agreement.

     Section 7.10. Restriction on Investment. Other than (a) the common stock of
the  Company  owned  by USA on the  date  hereof,  (b) Oil  and  Gas  Properties
transferred   to  the  Company   prior  to  the  date  hereof  and  (c)  capital
contributions to the Company that are applied directly by the Company to pay the
Indebtedness  owing on the Notes,  USA will not,  and will not permit any of its
Subsidiaries  to, make any  Investment in the Company  without the  Noteholders'
prior written consent.

                                  ARTICLE VIII
                                  MISCELLANEOUS

     Section  8.01.  Transaction  Expenses.  Whether  or  not  the  transactions
contemplated  hereby  are  consummated,  USA will pay all  reasonable  costs and
expenses  (including  reasonable  attorneys'  fees of a special  counsel and any
local or other  counsel)  incurred  by the  Noteholders  or  holder of a Note in
connection with such transactions and in connection with any amendments,


                                      -22-

<PAGE>

waivers  or  consents  under  or in  respect  of  this  Agreement  or the  other
Transaction Documents (whether or not such amendment,  waiver or consent becomes
effective), including, without limitation: (a) the reasonable costs and expenses
incurred in enforcing or defending (or determining  whether or how to enforce or
defend) any rights under this Agreement or the other Transaction Documents or in
responding  to any  subpoena  or other legal  process or informal  investigative
demand  issued in  connection  with  this  Agreement  or the  other  Transaction
Documents,  or by reason of being a holder of any Note, (b) the reasonable costs
and expenses of negotiation, preparation and execution of this Agreement and the
other  Transaction  Documents,  and  (c)  the  reasonable  costs  and  expenses,
including  reasonable  financial advisors' fees, incurred in connection with the
insolvency  or bankruptcy  of USA or any  Subsidiary  or in connection  with any
work-out or  restructuring of the  transactions  contemplated  hereby and by the
Notes.  USA will pay, and will save the  Noteholders  and each other holder of a
Note harmless from, all claims in respect of any fees, costs or expenses if any,
of brokers and  finders  (other than those  retained  by the  Noteholders).  The
obligations of USA under this  Section 8.01 will survive the payment or transfer
of any Note,  the  enforcement,  amendment  or waiver of any  provision  of this
Agreement  or the  other  Transaction  Documents,  and the  termination  of this
Agreement.

     Section   8.02.   Survival   of   Representations   and   Warranties.   All
representations and warranties  contained herein shall survive the execution and
delivery  of this  Agreement  and the Notes,  the  purchase  or  transfer by the
Noteholders of any Note or portion  thereof or interest  therein and the payment
of any  Note,  and  may be  relied  upon  by any  subsequent  holder  of a Note,
regardless  of  any  investigation  made  at any  time  by or on  behalf  of the
Noteholders  or any other  holder of a Note.  All  statements  contained  in any
certificate  or other  instrument  delivered  by or on behalf of USA pursuant to
this Agreement shall be deemed  representations and warranties of USA under this
Agreement.

     Section 8.03.  Amendment and Waiver. This Agreement may be amended, and the
observance  of  any  term  hereof  may  be  waived  (either   retroactively   or
prospectively),  with  (and only  with)  the  written  consent  of the  Required
Holders,  except that no amendment or waiver may, without the written consent of
the holder of each Note at the time outstanding  affected  thereby,  release USA
from its obligations hereunder. Any amendment or waiver consented to as provided
in this Section 8.03 applies equally to all holders of Notes and is binding upon
them and upon  each  future  holder of any Note and upon USA  without  regard to
whether such Note has been marked to indicate such amendment or waiver.  No such
amendment  or waiver  will  extend  to or affect  any  obligation,  covenant  or
agreement  not  expressly  amended  or  waived or  impair  any right  consequent
thereon.  No course of  dealing  between  USA and the holder of any Note nor any
delay in  exercising  any rights  hereunder or under any Note shall operate as a
waiver of any rights of any holder of such Note.

     Section  8.04.  Notices.  All  notices  and  communications   provided  for
hereunder shall be in writing and sent (a) by telecopy if the sender on the same
day sends a confirming  copy of such notice by a recognized  overnight  delivery
service (charges  prepaid),  or (b) by  registered or certified mail with return
receipt requested (postage prepaid), or (c) by a recognized overnight delivery


                                      -23-

<PAGE>

service  (with  charges  prepaid).  Any such  notice  must be sent:  (i) if to a
Noteholder,  to its address  specified for such  communications in Schedule A to
the Note  Agreement,  or at such other address as it shall have specified to USA
in writing, (ii) if to USA, to USA at 16420 Park Ten Place, Suite 300,  Houston,
Texas 77084, Telecopy No.:  713-578-7091,  or at such other address as USA shall
have specified to the holder of each Note in writing. Notices under this Section
8.04 will be deemed given only when actually received.

     Section 8.05. Limitation on Interest.  Each provision in this Agreement and
each  other  Transaction  Document  is  expressly  limited  so that in no  event
whatsoever shall the amount paid, or otherwise agreed to be paid, by USA for the
use,  forbearance or detention of the money to be loaned under this Agreement or
any other Transaction Document or otherwise (including any sums paid as required
by any  covenant  or  obligation  contained  herein or in any other  Transaction
Document which is for the use,  forbearance or detention of such money),  exceed
that amount of money which would cause the effective rate of interest thereon to
exceed the Highest  Lawful Rate,  and all amounts owed under this  Agreement and
each other Transaction  Document shall be held to be subject to reduction to the
effect  that such  amounts  so paid or agreed to be paid  which are for the use,
forbearance  or  detention  of money under this  Agreement  or such  Transaction
Document  shall in no event  exceed  that  amount of money which would cause the
effective rate of interest thereon to exceed the Highest Lawful Rate.

     Section 8.06.  Successors and Assigns.  All covenants and other  agreements
contained in this  Agreement  by or on behalf of any of the parties  hereto bind
and inure to the benefit of their respective  successors and assigns (including,
without  limitation,  any  subsequent  holder of a Note) whether so expressed or
not.

     Section  8.07.  Severability.  Any  provision  of  this  Agreement  that is
prohibited or unenforceable in any jurisdiction  shall, as to such jurisdiction,
be ineffective to the extent of such  prohibition  or  unenforceability  without
invalidating  the  remaining  provisions  hereof,  and any such  prohibition  or
unenforceability in any jurisdiction shall (to the full extent permitted by law)
not invalidate or render unenforceable such provision in any other jurisdiction.

     Section 8.08. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be an original but all of which together shall
constitute one  instrument.  Each  counterpart may consist of a number of copies
hereof, each signed by less than all, but together signed by all, of the parties
hereto.

     Section 8.09.  Confidentiality.  In  connection  with the  negotiation  and
administration  of this Agreement and the other Transaction  Documents,  USA has
furnished and will from time to time furnish the Noteholders (such  information,
other than any such information which (i) was publicly  available,  or otherwise
known to the Noteholders,  at the time of disclosure,  (ii) subsequently becomes
publicly  available other than through any act or omission by the Noteholders or
(iii) otherwise subsequently becomes known to the Noteholders, being hereinafter
referred to as  "Confidential  Information").  The Noteholders will maintain the
confidentiality of any


                                      -24-
<PAGE>

Confidential  Information in accordance  with such procedures as the Noteholders
apply generally to information of that nature. It is understood,  however,  that
the foregoing will not restrict the Noteholders' ability to freely exchange such
Confidential  Information with current or prospective  investors,  assignees and
advisors.   Subject  to  the  prohibitions  and  restrictions   imposed  on  the
Noteholders  with  respect  to the  Confidential  Information  under  applicable
securities  laws, it is further  understood that the foregoing will not prohibit
the disclosure of any or all Confidential  Information if and to the extent that
such  disclosure may be required or requested (w) by a  Governmental  Authority,
(x) pursuant to court order,  subpoena or other legal  process or in  connection
with any pending or threatened litigation  hereunder,  (y) otherwise as required
by law,  or (z) in order to protect  its  interests  or its  rights or  remedies
hereunder or under the other Transaction Documents; in the event of any required
disclosure  under clause (w), (x), or (y) above,  the  Noteholders  agree to use
reasonable efforts to inform USA as promptly as practicable.

     Section 8.10. Final Agreement of the Parties.  THIS AGREEMENT AND THE OTHER
TRANSACTION  DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY
NOT BE  CONTRADICTED  BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS  OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL  AGREEMENTS  BETWEEN THE
PARTIES.

     Section  8.11.  Jury Waiver.  USA, THE COMPANY AND THE  NOTEHOLDERS  HEREBY
IRREVOCABLY  WAIVE ANY AND ALL  RIGHT TO TRIAL BY JURY IN ANY  LEGAL  PROCEEDING
ARISING OUT OF OR RELATING TO THIS  AGREEMENT OR THE  TRANSACTIONS  CONTEMPLATED
HEREBY.

     Section 8.12.  Choice of Forum.  USA, THE COMPANY AND THE NOTEHOLDERS AGREE
THAT ANY LEGAL  PROCEEDING  ARISING OUT OF OR RELATING TO THIS  AGREEMENT OR THE
TRANSACTIONS CONTEMPLATED HEREBY SHALL BE BROUGHT IN THE FEDERAL OR STATE COURTS
OF  HARRIS  COUNTY,  TEXAS,  OTHER  THAN  LEGAL  PROCEEDINGS  INSTITUTED  BY THE
NOTEHOLDERS  WITH  RESPECT  TO THEIR  RIGHTS  AND  REMEDIES  UNDER THE  SECURITY
DOCUMENTS,  WHICH  PROCEEDINGS  MAY BE BROUGHT IN THE FEDERAL OR STATE COURTS OF
HARRIS COUNTY,  TEXAS OR THE COURTS OF ANY OTHER JURISDICTION DEEMED APPROPRIATE
BY THE  NOTEHOLDERS  TO ENFORCE  THEIR  RIGHTS AND  REMEDIES  UNDER THE SECURITY
DOCUMENTS.

     Section 8.13. Governing Law. This Agreement shall be construed and enforced
in accordance  with, and the rights of the parties shall be governed by, the law
of the State of New York excluding  choice-of-law  principles of the law of such
State that would require the  application  of the laws of a  jurisdiction  other
than such State.



                                      -25-
<PAGE>

     IN WITNESS  WHEREOF,  USA, the Company and the Noteholders have caused this
Agreement  to be executed by their  respective  representatives  thereunto  duly
authorized effective as of the date first above written.

                                            UNIVERSAL SEISMIC ASSOCIATES, INC.


                                            By:     /s/ Michael J. Pawelek
                                                  --------------------------- 
                                            Name:    Michael J. Pawelek
                                            Title:   President


                                            UNEXCO, INC.


                                            By:     /s/ Michael J. Pawelek
                                                   ---------------------------
                                            Name:    Michael J. Pawelek
                                            Title:   President



                                            RIMCO PARTNERS, L.P. II,
                                            RIMCO PARTNERS, L.P. III, and
                                            RIMCO PARTNERS, L.P. IV

                                            By: Resource Investors Management
                                                  Company Limited Partnership,
                                                  their general partner

                                            By: RIMCO Associates, Inc.,
                                                  its general partner


                                            By:     /s/ Gary Milavec
                                                  --------------------------- 
                                            Name:    Gary Milavec
                                            Title:   Vice President



                                      -26-
<PAGE>













                               SCHEDULES OMITTED
<PAGE>

                                                           EXHIBIT G-1

                               FIRST AMENDMENT TO
                         GUARANTY AND EXCHANGE AGREEMENT

     This First  Amendment  to Guaranty  and  Exchange  Agreement  (this  "First
Amendment")  dated as of  May 28,  1996 is  between  UNEXCO,  Inc.,  a  Delaware
corporation  (the "Company"),  Universal  Seismic  Associates,  Inc., a Delaware
corporation   ("USA"),   and  RIMCO  Partners,   L.P.  II,  a  Delaware  limited
partnership, RIMCO Partners, L.P. III, a Delaware limited partnership, and RIMCO
Partners,   L.P.  IV,  a  Delaware  limited   partnership   (collectively,   the
"Noteholders").

                             PRELIMINARY STATEMENTS

     A. The  Company  and the  Noteholders  have  heretofore  entered  into that
certain Note Purchase Agreement, dated January 19, 1996 (as amended from time to
time, the "Note Agreement").

     B. USA, the Company and the Noteholders  have heretofore  entered into that
certain Guaranty and Exchange  Agreement,  dated January 19, 1996 (the "Guaranty
and Exchange  Agreement"),  whereby,  among other  things,  USA  guaranteed  the
payment of the Company's obligation under the Note Agreement,  the Notes and the
other Transaction Documents.

     C. USA,  the Company and the  Noteholders  now desire to amend the Guaranty
and Exchange Agreement with respect to the matters set forth herein.

     D.  Capitalized  terms  used  herein  shall  have the  respective  meanings
described  thereto in the Note  Agreement  unless herein  defined or the context
shall otherwise require.

                                   AGREEMENTS

     NOW,  THEREFORE,  in  consideration  of the  premises  and  other  good and
valuable   consideration   the  receipt  and  sufficiency  of  which  is  hereby
acknowledged, USA, the Company and the Noteholders agree as follows:

Section 1. Amendments.

     1.1 Section 4.15 of the Guaranty and Exchange  Agreement is amended in its
entirety to read as follows:

          "Section 4.15.  Capitalization.  The authorized  capital stock of
     USA consists  solely of 20,000,000  shares of $.0001 par common stock,
     of which 4,221,420 shares are issued and outstanding."

     1.2 Section 7.01 of the  Guaranty and Exchange  Agreement is amended in its
entirety to read as follows:


                                       -1-
<PAGE>
<PAGE>

          "Section 7.01.  Restrictions on  Indebtedness.  USA will not, and
     will not permit any Subsidiary to, create, incur, assume,  Guaranty or
     permit to exist any Indebtedness, except:

          (a) the Notes;

          (b) the USA Notes;

          (c) the New USA Notes;

          (d)   Indebtedness   outstanding   under  the  Fidelity   Funding
     Agreement; and

          (e)  Indebtedness  in the  amount of  $81,675.47  owing to Sentry
     Financial Corporation."

     1.3 Section  7.02(c) of the Guaranty  and Exchange  Agreement is amended in
its entirety to read as follows:

          "(c)  Liens  under  the USA Note  Agreement  and the New USA Note
     Agreement."

     1.4 Section  7.03(f) of the Guaranty  and Exchange  Agreement is deleted in
its entirety.

     1.5 Section 7.04 of the  Guaranty and Exchange  Agreement is amended in its
entirety to read as follows:

          "Section 7.04. Restricted Payments. Except as contemplated by the
     Transaction  Documents,  the New Transaction  Documents,  the USA Note
     Agreement and the documents and agreements  contemplated  thereby, USA
     will not, and will not permit any Subsidiary,  directly or indirectly,
     to make or pay (a) any dividend or other distribution on any shares of
     the USA's capital stock (including any dividends  payable in shares of
     capital   stock),   (b)  any  payment  on  account  of  the  purchase,
     redemption,  retirement  or  acquisition  of any  shares  of the USA's
     capital  stock or any option,  warrant or other right to acquire  such
     shares,  or  (c)  any  payments  or  other   distributions  to  Sierra
     Management, Inc."

Section 2. Representations and Warranties of USA and the Company.

     2.1 USA and the Company represent and warrant to the Noteholders that:

          (a) this  First  Amendment  has been  duly  authorized,  executed  and
     delivered by them and this First Amendment constitutes the legal, valid and
     binding  obligation  of USA and the  Company  enforceable  against  them in
     accordance with its terms, except as enforcement


                                       -2-
<PAGE>
<PAGE>

     may be limited by  bankruptcy,  insolvency,  reorganization,  moratorium or
     similar laws or  equitable  principles  relating to or limiting  creditors'
     rights generally;

          (b) The  Guaranty  and  Exchange  Agreement,  as amended by this First
     Amendment,  constitutes the legal,  valid and binding obligation of USA and
     the Company  enforceable  against them in accordance with its terms, except
     as enforcement  may be limited by bankruptcy,  insolvency,  reorganization,
     moratorium or similar laws or equitable  principles relating to or limiting
     creditors' rights generally;

          (c) the execution,  delivery and performance by USA and the Company of
     this  First  Amendment  (i)  has  been  duly  authorized  by all  requisite
     corporate  action  and,  if  required,  shareholder  action,  (ii) does not
     require the consent or approval of any  governmental  or regulatory body or
     agency,  and (iii) will not (A) violate (1) any provision of law,  statute,
     rule or regulation or its certificate of incorporation  or bylaws,  (2) any
     order of any court or any rule,  regulation or order of any other agency or
     government binding upon it, or (3) any provision of any material indenture,
     agreement  or other  instrument  to  which  it is a party  or by which  its
     properties  or  assets  are or may be bound,  or (B)  result in a breach or
     constitute  (alone  or with due  notice or lapse of time or both) a default
     under any such indenture, agreement or other instrument;

          (d) as of the date  hereof  and  after  giving  effect  to this  First
     Amendment, no Default or Event of Default has occurred which is continuing;
     and

          (e) all representations and warranties  contained in Article IV of the
     Guaranty and Exchange Agreement and in the other Transaction  Documents are
     true and correct in all material respects with the same force and effect as
     if made by USA or the Company, as applicable, on and as of the date hereof.

Section 3. Conditions to Effectiveness of This First Amendment.

     3.1 This First Amendment shall not become effective until, and shall become
effective when, each of the following conditions shall have been satisfied:

          (a) executed  counterparts of this First  Amendment,  duly executed by
     USA and the Company and the  Noteholders,  shall have been delivered to the
     Noteholders;

          (b) the  Noteholders  shall have received a copy of the resolutions of
     the Board of Directors of USA and the Company  authorizing  the  execution,
     delivery and  performance  by USA and the Company of this First  Amendment,
     certified by their respective Secretary or an Assistant Secretary;

          (c) the  representations  and  warranties  of USA and the  Company set
     forth  in  Section 2  hereof  are true  and  correct  on and as of the date
     hereof; and


                                       -3-
<PAGE>
<PAGE>

          (d) the  Noteholders  shall have  received  the  favorable  opinion of
     counsel to USA and the  Company  as to the  matters  set forth in  Sections
     2.1(a),  2.1(b)  and  2.1(c)  hereof,  which  opinion  shall be in form and
     substance satisfactory to the Noteholders.

Section 4. Payment of Noteholders' Counsel Fees and Expenses.

     4.1 USA and the Company agree to pay upon demand,  the reasonable  fees and
expenses of Andrews & Kurth L.L.P.,  counsel to the  Noteholders,  in connection
with the  negotiation,  preparation,  approval,  execution  and delivery of this
First Amendment.

Section 5. Miscellaneous.

     5.1 This First  Amendment shall be construed in connection with and as part
of the  Guaranty and Exchange  Agreement,  and except as modified and  expressly
amended by this First Amendment, all terms, conditions,  and covenants contained
in the  Guaranty  and Exchange  Agreement  are hereby  ratified and shall be and
remain in full force and effect.

     5.2 Any and all  notices,  requests,  certificates  and  other  instruments
executed and delivered  after the execution and delivery of this First Amendment
may  refer to the  Guaranty  and  Exchange  Agreement  without  making  specific
reference to this First Amendment but  nevertheless  all such  references  shall
include this First Amendment unless the context otherwise requires.

     5.3 The descriptive headings of the various Sections or parts of this First
Amendment  are for  convenience  only  and  shall  not  affect  the  meaning  or
construction of any of the provisions hereof.

     5.4 This First  Amendment  shall be governed by and construed in accordance
with New York law.

                                       UNIVERSAL SEISMIC ASSOCIATES, INC.


                                       By:    /s/ Michael J. Pawelek
                                             ___________________________
                                       Name:    Michael J. Pawelek
                                       Title:   President

                                       UNEXCO, INC.


                                       By:    /s/ Michael J. Pawelek
                                             ___________________________
                                       Name:    Michael J. Pawelek
                                       Title:   President




                                       -4-
<PAGE>
<PAGE>

                                        RIMCO PARTNERS, L.P. II,
                                        RIMCO PARTNERS, L.P. III, and
                                        RIMCO PARTNERS, L.P. IV

                                        By: Resource Investors Management
                                             Company Limited Partnership,
                                             their general partner

                                        By: RIMCO Associates, Inc.,
                                             its general partner


                                        By:    /s/ Gary Milavec
                                              ___________________________ 
                                        Name:    Gary Milavec
                                        Title:   Vice President


                                       -5-
<PAGE>


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