UNIVERSAL SEISMIC ASSOCIATES INC
10QSB, 1997-05-21
OIL & GAS FIELD EXPLORATION SERVICES
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                  FORM 10-QSB

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

 
(Mark One)
[X]          QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934

                For the quarterly period ended March 31, 1997

[ ]          TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                           THE EXCHANGE ACT OF 1934

                        Commission file number  1-19971

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

                      UNIVERSAL SEISMIC ASSOCIATES, INC.
       (Exact name of small business issuer as specified in its charter)

          Delaware                                        76-0256086
(State or other jurisdiction of             (I.R.S. Employer Identification No.)
incorporation or organization)

                        16420 Park Ten Place, Suite 300
                          Houston, Texas  77084-5051
                   (Address of principal executive offices)

                                (281) 578-8081
                          (Issuer's telephone number)

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

     Check whether the issuer (1) filed all reports required to be filed by
Section 13 or 15(d) of the Exchange Act during the past 12 months (or for such
shorter period that the registrant was required to file such reports), and (2)
has been subject to such filing requirements for the past 90 days.  
Yes   X   No 
    -----     -----

     State the number of shares outstanding of each of the issuer's classes of
common equity, as of the latest practicable date:  5,239,109 shares of Common
Stock, $.0001 par value, were outstanding as of  May 9, 1997.

Transitional Small Business Disclosure Format (Check one):

                                        Yes        No   X
                                            -----     ------

                                 PAGE 1 OF 12
<PAGE>
 
 
                                    PART I
                             FINANCIAL INFORMATION

UNIVERSAL SEISMIC ASSOCIATES, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEET
                                 (UNAUDITED)

                                                  March 31,           June 30,
                                                    1997                1996  
                ASSETS                                                        
                                                                              
Current assets:                                                               
   Cash and cash equivalents                   $   204,978         $   982,431
   Trade accounts receivable, net                7,142,483           7,999,364
   Accounts receivable - employees                  41,819              47,597
   Costs in excess of billings and                                            
    estimated earnings on uncompleted                                         
    contracts                                    1,379,735           1,733,525
   Prepaid expenses and other current                                         
    assets                                         350,181             626,254
                                               -----------         -----------
         Total current assets                    9,119,196          11,389,171
                                                                              
Property and equipment:                                                       
   Seismic property and equipment, net          16,637,382          17,953,678
   Unevaluated oil and gas properties            7,903,670           1,722,847
                                               -----------         -----------
         Total property and equipment, net      24,541,052          19,676,525
                                                                              
Other assets:                                                                 
   Deferred financing costs, net                   199,284             217,945
   Receivable from stockholder                           -              28,440
   Other                                           149,709             181,227
Goodwill, net                                      614,405             652,538
                                               -----------         -----------
         Total assets                          $34,623,646         $32,145,846
                                               ===========         ===========
                                                                              
        LIABILITIES AND STOCKHOLDERS' EQUITY                                  

Current Liabilities:                                                          
   Notes payable, current                      $ 2,574,617         $ 5,473,870
   Billings and estimated earnings in                                         
    excess of costs on uncompleted contracts     1,826,195           2,185,926
   Accounts payable                              6,797,419           5,578,646
   Other current liabilities                     2,107,481           1,137,890
                                               -----------         -----------
         Total current liabilities              13,305,712          14,376,332
                                                                              
Notes payable, net of current maturities        11,605,562           9,870,689
                                               -----------         -----------
         Total liabilities                      24,911,274          24,247,021
                                               -----------         ----------- 
Commitments and contingencies                                                 
Stockholders' equity:                                                         
   Common stock, $.0001 par value;                                            
    20,000,000 shares authorized; 5,239,109 
    shares at March 31, 1997 and 4,283,147 
    shares issued at June 30, 1996                     524                 428
   Additional paid in capital                   17,105,443          13,553,317
                                                
   Accumulated deficit                           7,373,595          (5,634,920)
   Less:  Treasury stock, at cost; 5,000                                      
    shares                                         (20,000)            (20,000)
                                               -----------         -----------
         Total stockholders' equity              9,712,372           7,898,825
                                               -----------         -----------
         Total liabilities and stockholders'                                  
          equity                               $34,623,646         $32,145,846 
                                               ===========         ===========


                SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS

                                 PAGE 2 OF 12
<PAGE>
 
                                    PART I
                             FINANCIAL INFORMATION



UNIVERSAL SEISMIC ASSOCIATES, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                                        (unaudited)


<TABLE> 
<CAPTION> 

                                               Three months ended March 31,     Nine months ended March 31,  
                                               ----------------------------     ---------------------------  
                                                   1997            1996            1997             1996     
                                               ------------     -----------     -----------      ----------  
<S>                                              <C>             <C>             <C>             <C> 
                                                                                (restated)
Operating revenues:                                                                                          
   Data acquisition revenues                      6,274,192       6,911,325      23,466,072      14,670,731  
   Data processing revenues                         261,818         318,705       1,052,696         802,495  
                                                -----------      ----------     -----------     -----------
      Total operating revenues                    6,536,010       7,230,030      24,518,768      15,473,226  
                                                                                                             
Operating expenses:                                                                                          
   Cost of data acquisition                       5,857,496       5,323,789      20,439,062      11,818,214  
   Cost of data processing                          203,176         211,791         627,151         649,250   
   Selling, general and administrative 
    expenses                                        545,561         559,898       1,604,886       1,547,011 
   Expenses related to proposed merger, 
    proxy  contest & shareholder 
    litigation                                      526,815               -         828,045               - 
   Depreciation and amortization                    779,279         567,397       2,315,005       1,612,602 
                                                -----------      ----------     -----------     -----------
      Total operating expenses                    7,912,327       6,662,875      25,814,149      15,627,077 
                                                                                                            
Gain on sale of oil and gas properties                    -               -         559,461               - 
                                                -----------      ----------     -----------     ----------- 
      Total operating income                     (1,376,317)        567,155        (735,920)       (153,851)
                                                                                                            
Interest expense                                   (318,406)       (290,866)     (1,016,533)       (772,953)
Other income, net                                     8,880             (65)         13,777          13,580  
                                                -----------      ----------     -----------     -----------
Net Income (loss)                               $(1,685,843)     $  276,224     $(1,738,676)    $  (913,224)
                                                ===========      ==========     ===========     ===========
                                                                                                            
Earnings (loss) per share         Primary       $     (0.32)     $     0.07     $     (0.34)    $     (0.22)
                                                                                                            
Weighted average common shares                                                                              
 and common share equivalents                                                                               
 outstanding                      Primary         5,255,796       4,203,565       5,140,506       4,202,581  

</TABLE> 


                SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS

                                 PAGE 3 OF 12
<PAGE>
 
                                    PART I
                             FINANCIAL INFORMATION


UNIVERSAL SEISMIC ASSOCIATES, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS
                          (unaudited)



        
                                                    Nine Months Ended March 31,
                                                    --------------------------
                                                         1997          1996
                                                    ------------  ------------
                                                     (restated)
Cash flows from operating activities:
   Net loss                                         $ (1,738,676) $   (913,224)
   Adjustments to reconcile net loss 
    to net cash provided by operating activities:
      Depreciation and amortization                    2,354,700     1,732,077
      (Gain)loss on disposal of assets                  (559,461)        1,333
      Changes in operating assets and liabilities:
       Accounts receivable                               862,659    (2,950,103)
       Notes receivable                                        -             -
       Costs in excess of billings                       353,790    (1,847,389)
       Other assets                                      307,591       305,182
       Accounts payable                                1,218,773     1,520,772
       Billings and estimated earnings in excess 
        of costs                                        (359,731)    2,659,580
       Other current liabilities                         970,563      (276,153)
       Other                                                   -      (158,162)
                                                    ------------  ------------
         Net cash provided by operating activities     3,410,208        73,913
                                                    ------------  ------------
Cash flows from investing activities:
   Capital expenditures                               (7,787,558)     (745,305)
   Proceeds from sale of assets                        1,205,625        29,838
                                                    ------------  ------------
         Net cash used in investing activities        (6,581,933)     (715,467)
                                                    ------------  ------------
Cash flows from financing activities:
   Proceeds from notes payable                        24,798,066    20,621,248
   Payments on notes payable                         (21,827,170)  (15,042,394)
   Payments on long term debt                           (656,315)   (4,890,181)
   Payments on capital leases                                  -      (562,753)
   Proceeds from issuance of common stock, net            51,251        12,500
   Proceeds from receivable from Sierra Mgmnt, Inc.       28,440        36,000
   Payment of financing costs                                  -      (123,000)
                                                    ------------  ------------
         Net cash provided by financing activities     2,394,272        51,420
                                                    ------------  ------------
Net decrease in cash and cash equivalents               (777,453)     (590,134)
Cash and cash equivalents at beginning of period         982,431     1,208,357
                                                    ------------  ------------
Cash and cash equivalents at end of period          $    204,978  $    618,223
                                                    ============  ============

                SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS

                                 PAGE 4 OF 12

<PAGE>
 
              UNIVERSAL SEISMIC ASSOCIATES, INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS


1.  The consolidated condensed financial statements of Universal Seismic
Associates, Inc. and subsidiaries (the "Company") have been prepared by the
Company, without audit, pursuant to the rules and regulations of the Securities
and Exchange Commission. Certain information and footnote disclosures normally
included in financial statements prepared in accordance with generally accepted
accounting principles have been condensed or omitted pursuant to such rules and
regulations, although the Company believes that the disclosures are adequate to
make the information presented not misleading. These condensed financial
statements should be read in conjunction with the financial statements and the
notes thereto included in the Company's latest Annual Report to Shareholders and
the Annual Report to the Securities and Exchange Commission on form 10-KSB for
the year ended June 30, 1996. In the opinion of the Company, all adjustments,
consisting only of normal recurring adjustments, necessary to present fairly the
financial position as of March 31, 1997, the results of operations for the three
months and nine months ended March 31, 1996 and 1997, and statements of cash
flows for the nine months then ended have been included.

2.  The Company has restated its financial statements as of and for the three
month periods ended September 30, 1996 and December 31, 1996. This action was
taken as a result of an internal review by the Audit Committee of the Company's
Board of Directors, which had been commenced in February 1997 in response to
allegations made by a stockholder who is pursuing litigation against the
Company. The review identified that certain seismic acquisition start-up costs
had been deferred to be amortized over subsequent periods. Some companies within
the seismic industry utilize an accounting policy which defers and amortizes
crew start-up costs, the Company's independent accountants advised that the
historical policy of expensing start-up costs as incurred is the preferable
method of accounting for such costs. Additionally, it was determined that the
Company mistakenly recognized revenue related to a project involving its wholly
owned subsidiary UNEXCO, Inc. ("UNEXCO") when such revenues should have offset
the full cost pool. Accordingly, the previously reported financial results for
the three month periods ended September 30, 1996 and December 31, 1996 have been
restated. Previously reported results of operations were overstated by $865,447
for the three months ended September 30, 1996 and understated by $162,537 for
the three months ended December 31, 1996.

3.  The foregoing interim results are not necessarily indicative of the results
of operations for the full fiscal year ending June 30, 1997.

4. On September 30, 1996, UNEXCO sold its 16.5% working interest in the Bowie
Lumber leases (the "Leases") within the Lake Boeuf Prospect 3D seismic survey
(the "Prospect") in Lafourche Parish, Louisiana for $680,625 to National Energy
Group, Inc.

                                 PAGE 5 OF 12
<PAGE>
 
Previously, UNEXCO had purchased such interest in the Leases from Araxas
Exploration, Inc. for $121,164. It was subsequently determined by an independent
engineering firm that the Leases contained proven undeveloped reserves. This
asset sale by UNEXCO of its interest in the above referenced Leases represents
approximately 4% of the total acreage encompassing the Prospect. UNEXCO
continues to be a 37.5% working interest partner in the Prospect's remaining
approximate 14,000 acres.

5.  On November 13, 1996, the Company announced the termination of negotiations
with respect to the previously announced proposed combination with SUELOPETROL.
The companies could not resolve various material business and due diligence
issues. The Company has incurred expenses of $301,230 related to this proposed
merger.

6.  On December 20, 1996 the Company entered into a Note Purchase Agreement with
four limited partnerships (the "Partnerships") of which Resource Investors
Management Company ("RIMCO") is the sole general partner, pursuant to which the
Company executed four 12% Senior Secured Exchangeable General Obligation Notes
in the aggregate principal amount of $4,000,000, the proceeds of which are to be
funded through June 30, 1998, to be utilized to finance its current and future
UNEXCO exploration and production activities. On March 27, 1997 the Note
Purchase Agreement and Senior Secured General Obligation Notes were amended in
order to increase the aggregate principal amount to $5,500,000. The Notes have a
three year maturity and will function as a revolving credit line with monthly
payments of interest only. Any net proceeds generated from the sale of oil and
gas prospects, properties, and production will be utilized to pay down the
facility and create additional borrowing availability.

7.  On March 27, 1997 the Company entered into a Note Purchase Agreement with
four Partnerships of which RIMCO is the sole general partner, pursuant to which
the Company executed four 12% Senior Secured General Obligation Notes in the
aggregate principal amount of $2,000,000, the proceeds of which will be utilized
for general working capital purposes. The Notes mature on December 1, 1999.
Prior to maturity, payments of interest will be due and payable monthly. All
outstanding principal plus accrued and unpaid interest will be due and payable
at maturity. The Company shall have the right and option to prepay, at any time
and without penalty, all or any part of the Notes.

8.  On May 28, 1996 the Company entered into a Note Purchase Agreement with
three Partnerships of which RIMCO is the sole general partner, pursuant to which
the Company executed three 10% Senior Secured General Obligation Notes in the
aggregate principal amount of $6,500,000. The Notes required monthly
installments of interest only through November 1, 1996 and commencing December
1, 1996, monthly installments of $138,106, including interest through November
1, 1999 with the unpaid principal balance due December 1, 1999. RIMCO has
deferred principal payments for an additional seven months, allowing monthly
installments of interest only to continue through July 1, 1997.

                                 PAGE 6 OF 12
<PAGE>
 
9.  The Company's agreements with RIMCO require that it will not permit its
Current Assets (as defined in the applicable credit agreements) at any time on
or after September 30, 1996 to be less than the sum of (i) its Current
Liabilities (as defined in the applicable credit agreements) as at such date,
minus, (ii) any portion of such Current Liabilities consisting of amounts
borrowed under its credit facility with Fidelity Funding, Inc. that are not due
within one year of such date. At March 31, 1997 the Company was not in
compliance with this requirement. RIMCO has waived this financial covenant. The
Company has not made its required May 1, 1997 principal and interest payments to
RIMCO. RIMCO has provided the Company with a sixty day waiver of this payment
requirement.

10. The Registrant (the "Company") was involved in a proxy fight with a group of
shareholders that has styled themselves "The Universal Seismic Stockholders' 
Committee" (the "Shareholders' Committee"). In connection therewith, the Company
and its directors have been involved in litigation with the Shareholders'
Committee in Delaware Federal District Court (the "Court") since January, 1997.
The Company's Annual Meeting of Shareholders (the "Meeting") was originally
convened on January 28, 1997. On the date before the Meeting the Court ordered
that the polls remain open with respect to the voting at the Meeting until
February 11, 1997, and, as a result, the Meeting was adjourned until that date.
CT Corporation System, the Inspector for the Election, after a challenge and
review session certified the results of the election in which the incumbent
directors were reelected and all of the Shareholders' Committee's proposals were
defeated.

                                 PAGE 7 OF 12
<PAGE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS


NINE MONTHS ENDED MARCH 31, 1997 VS. NINE MONTHS ENDED MARCH 31, 1996

OPERATING REVENUE AND COSTS

     Operating Revenues.  Operating revenues of $24,518,768 for the nine months
ended March 31, 1997 represent an increase of approximately 59% over revenues of
$15,473,226 for the same prior year period.  Data acquisition revenues for the
nine month period in 1997, increased by approximately 60%, to $23,466,072.  This
increase reflects nine months of operation of the Company's fifth and sixth 3D
data acquisition crews placed in service in mid-December 1995 and late May 1996,
respectively.  Data processing revenues for the nine month period in 1997,
increased by approximately 31% to, $1,052,696.  This increase reflects the
Company's success in obtaining a greater volume of seismic data processing
projects.

     Operating Expenses. Operating expenses of $25,814,149 for the nine months
ended March 31, 1997 represent an increase of approximately 65% over expenses of
$15,627,077 for the same prior year period. Direct costs of data acquisition for
the nine months ended March 31 increased approximately 73%, from $11,818,214 in
1996 to $20,439,062 in 1997, due to the Company's expanded crew operations.
Also, included in the current period direct cost of data acquisition is (i) a
$400,000 provision related to a contract which is expected to be completed at a
loss in mid-June 1997 and (ii) approximately $600,000 of expense incurred in
August 1996 with no offsetting revenues by two crews that were temporarily idle.
Direct costs of data processing decreased slightly for the nine month period,
from $649,250 in 1996 to $627,151 in 1997.

     Selling, General and Administrative Expenses.  Selling, general and
administrative expenses ("SG&A") increased approximately 4%, for the comparable
nine month period, from $1,547,011 in 1996 to $1,604,886 in 1997.  The slight
increase resulted from increased insurance costs and personnel relocation costs.

     Expenses Relating to Proposed Merger, Proxy Contest, and Shareholder
Litigation. The Company incurred $828,045 in expenses during the current period
as follows: (i) $301,230 relating to the proposed Suelopetrol merger, (See Note
5 to Condensed Financial Statements) and (ii) $526,815 of legal fees and other
costs related to the proxy contest and subsequent litigation initiated by a
shareholder.

     Depreciation and Amortization.  Depreciation and amortization increased by
approximately 44% from $1,612,602 in 1996 to $2,315,005 in 1997.  The increase
in depreciation resulted primarily from equipment additions related to the
Company's crew expansion made during fiscal year 1996.

     Interest Expense.  Interest expense increased approximately 32%, from
$772,953 for the nine months ended March 31, 1996 to $1,016,533, in the nine
months ended March 31, 1997.  The increased interest cost resulted primarily
from equipment financing required for the expansion of the Company's data
acquisition business.

                                 PAGE 8 OF 12
<PAGE>
 
     Net Loss.  The Company reported a net loss of $1,738,676 for the nine
months ended March 31, 1997 as compared to a net loss of $913,224 for the same
period in 1996.  The net loss for the nine month period ending March 31, 1997 is
after a $559,461 gain on a sale of leasehold interest by UNEXCO. (See Note 4 to
Consolidated Condensed Financial Statements). The current period net loss
reflects expenses of (i) $301,230 related to the proposed merger, (ii) $526,815
related to the proxy contest and litigation with a shareholder, (iii) a $400,000
provision related to a contract which is expected to be completed at a loss in
mid-June 1997 and (iv) approximately $600,000 of expense incurred in August 1996
with no offsetting revenues by two crews that were temporarily idle. Also
contributing to the current period net loss were reduced gross profit margins
from the Company's data acquisition crews.

THREE MONTHS ENDED MARCH 31, 1997 VS. THREE MONTHS ENDED MARCH 31, 1996

OPERATING REVENUE AND COSTS

     Operating Revenues. Operating revenues of $6,536,010 for the three months
ended March 31, 1997 represent a decrease of approximately 10% from revenues of
$7,230,030 for the same prior year period. Data acquisition revenues decreased
approximately 9% to $6,274,192 in the current three month period due to permit
problems and weather conditions that caused project start up delays and low
rates of production by the Company's seismic crews. Data processing revenues
decreased approximately 18% to $261,818 in the current period ended March 31,
1997 primarily due to a reduction in 3D processing backlog obtained by the
Company.

     Operating Expenses.  Operating expenses increased from $6,662,875 to
$7,912,327, or approximately 19%, for the quarter ended March 31, 1997.  Direct
costs of data acquisition increased by approximately 10% to $5,857,496 due to
the expanded crew operations along with a $400,000 provision related to a
contract which is expected to be completed at a loss in mid-June 1997.  Direct
costs of data processing decreased approximately 4% to $203,176 in the current
three month period as the level of 3D processing projects declined.

     Selling, General and Administrative Expenses.  SG&A decreased approximately
3%, for the comparable period, from $559,898 in 1996 to $545,561 in 1997.

     Expenses Relating to Proposed Merger, Proxy Contest, and Shareholder
Litigation.  The Company incurred $526,815 in legal fees and other costs related
to the proxy contest and subsequent litigation initiated by a shareholder.

     Depreciation and Amortization.  Depreciation and amortization increased by
approximately 37% from $567,397 in 1996 to $779,279 in 1997, due to the
equipment additions related to the Company's expanded crew operations.

     Interest Expense.  Interest expense increased approximately 9%, from
$290,866 for the three months ended March 31, 1996, to $318,406 for the same
period ended March 31, 1997.  The Company incurred increased financing costs
related to its crew expansion.

                                 PAGE 9 OF 12
<PAGE>
 
     Net Loss. The Company reported a net loss of $1,685,843 for the three month
period ended March 31, 1997 as compared to net income of $276,224 for the
comparable period in 1996. The current period net loss reflects expenses of (i)
$526,815 related to the proxy contest and litigation with a shareholder and (ii)
a $400,000 provision related to a contract which is expected to be completed at
a loss in mid-June 1997. Gross margins declined in both data acquisition and
processing in the current period.

LIQUIDITY AND CAPITAL RESOURCES

For the nine months ended March 31, 1997 cash and cash equivalents decreased
$777,453 primarily to cover shortages created by the Company's net loss of
$1,738,676.  Cash available at the beginning of the period was used to fund
operating activities, capital expenditures, and repayment of debt.  Capital
expenditures of $7,787,558 during the nine months include $6,826,984 invested in
oil and gas properties, $701,179 for miscellaneous data acquisition equipment
and $259,395 for data processing equipment.  The Company reduced long term debt
by $656,315 during the nine month period ended March 31, 1997.  The Company
incurred expenses relating to the proposed merger, proxy contest, and litigation
with a shareholder of $828,045 during the nine month period ended March 31,
1997.

On December 20, 1996 the Company's energy subsidiary UNEXCO, Inc., entered into
a $4,000,000 revolving line of credit facility with RIMCO. On March 27, 1997 the
agreement was amended increasing the revolving line to $5,500,000.  (See Note 6
to Consolidated Condensed Financial Statements)  As of March 31, 1997, UNEXCO
had borrowed a total of $4,000,000 from this facility.  As of May 19, 1997 the
outstanding balance under this facility was $4,500,000.

On March 27, 1997 the Company entered into a $2,000,000 note purchase agreement
with RIMCO, the proceeds of which will be utilized for general working capital
purposes.  This amount was funded on April 1, 1997.

The Company's accounts payable balance increased by $1,218,773 during the nine
month period ended March 31, 1997 and decreased by $1,517,751 for the three
month period ending March 31, 1997.  The increased accounts payable can be
attributed to (i)  slow collection of accounts receivable that restricted cash
available to reduce accounts payable, (ii)  the net loss incurred by the Company
during the current nine month period that restricted cash available to reduce
accounts payable and (iii)  increased expenditures associated with the expanded
data acquisition and production operations.  At March 31, 1997 the Company had
approximately $1,042,165 in trade accounts receivable over 90 days past due,
which has subsequently been reduced to $948,242.

At March 31, 1997 the Company had cash balances of $204,979. The Company feels
this cash along with anticipated cash flow from its seismic operations, funds
available under its accounts receivable credit facility, and the working capital
loan established on March 27, 1997 are sufficient to meet the working capital
needs of its seismic operations for the foreseeable future. The Company's
exploration and production operations will begin to generate cash flow in the
subsequent quarter. The Company does not believe this cash flow and funds
available under its exploration and production credit facility are adequate to
meet its exploration and production working capital requirements. The Company is
evaluating means whereby this additional capital can be provided.

Subsequent Events
None

                                 PAGE 10 OF 12
<PAGE>
 
                               OTHER INFORMATION

Item 1.   Legal Proceedings
 
The Registrant (the "Company") was involved in a proxy fight with a group of
shareholders that has styled themselves "The Universal Seismic Stockholders'
Committee" (the "Shareholders' Committee").  In connection therewith, the
Company and its directors have been involved in litigation with the
Shareholders' Committee in Delaware Federal District Court (the "Court") since
January, 1997.  The Company's Annual Meeting of Shareholders (the "Meeting") was
originally convened on January 28, 1997. On the day before the Meeting the Court
ordered that the polls remain open with respect to the voting at the Meeting
until February 11, 1997, and, as a result, the Meeting was adjourned until that
date.  CT Corporation System, the Inspector for the Election, after a challenge
and review session certified the results of the election in which the incumbent
directors were reelected and all of the Shareholders' Committee's proposals were
defeated.


Item 2. Changes in Securities
  None

Item 3. Default Upon Senior Securities
  None

Item 4. Submission of Matters to a Vote of Security Holders

  None

Item 5. Other Information

On January 30, 1997 and thereafter, Michael T. Kanarellis, one of the members of
the Committee submitted letters to various members of the Audit Committee
("Audit Committee") alleging certain errors or misstatements in the Company's
financial statements for the fiscal year ended June 30, 1996 and the fiscal
quarters ended September 30, 1996 and December 31, 1996.

The Company's Board of Directors thereafter authorized and directed the Audit
Committee to review the allegations, conduct an appropriate inquiry into matters
related thereto, and to report its findings and recommendations to the Board.
In this connection, the Audit Committee engaged Baker & Botts, L.L.P., Houston,
Texas as its legal advisor, who in turn engaged Arthur Andersen, L.L.P.,
Houston, Texas, to assist with the review.

                                 PAGE 11 OF 12
<PAGE>
 
In connection with its review, the Audit Committee engaged the Company's
independent accountants to perform a review of its unaudited financial
statements for the first three quarters of fiscal year 1997.  Based on the
review by the independent accountants and the preliminary recommendations of the
Audit Committee, the Company has decided to restate its results for the first
two quarters of fiscal year 1997, with the results that the Company's previously
reported first quarter earnings of $114,373 will be eliminated and that the
Company will report a loss of $751,074 for that period, and that the Company's
previously reported second quarter earnings of $535,704 will increase to
$698,241  The majority of the adjustments to the first two quarters relate to
recognition of previously deferred seismic acquisition start-up costs.


Item 6.   Exhibits and Reports on Form 8-K
 

Exhibit Number
- --------------

     1.1. Amended and Restated Note Purchase Agreement dated March 27, 1997
          between UNEXCO and RIMCO.

     1.2. Amended and Restated Guaranty Agreement dated March 27, 1997 between
          the Company and RIMCO.

     1.3. Amended and Restated Pledge Agreement dated March 27, 1997 between the
          Company and RIMCO.

     1.4. Fourth Amendment to Note Purchase Agreement (1/19/96) dated March 27,
          1997 between the Company and RIMCO.

     1.5. Second Amendment to Note Purchase (5/28/96) dated March 27, 1997
          between the Company and RIMCO.

     1.6. Note Purchase Agreement dated March 27, 1997 between the Company and
          RIMCO.

                                  SIGNATURES

          In accordance with the requirements of the Securities Exchange Act of
1934, the registrant caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                     UNIVERSAL  SEISMIC  ASSOCIATES, INC.



                                     RONALD L. ENGLAND
Date:  May 20, 1997               CHIEF  FINANCIAL  OFFICER

                                 PAGE 12 OF 12

<PAGE>
 
                   ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K



      1.1.  Amended and Restated Note Purchase Agreement dated March 27, 
                        1997 between UNEXCO and RIMCO.

<PAGE>
 
================================================================================

                                 UNEXCO, INC.







                                  $5,500,000
                  12% Senior Secured General Obligation Notes






                                    ------

                 AMENDED AND RESTATED NOTE PURCHASE AGREEMENT

                                    ------



                          Dated as of March 27, 1997



================================================================================

<PAGE>
 
                             AMENDED AND RESTATED
                            NOTE PURCHASE AGREEMENT

        AMENDED AND RESTATED NOTE PURCHASE AGREEMENT dated as of March 27, 1997
among UNEXCO, INC., a Delaware corporation (the "Company"), and RIMCO PARTNERS,
L.P., a Delaware limited partnership, 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").

        A. The Company and the Noteholders entered into that certain Note
Purchase Agreement dated as of December 20, 1996 (the "Original Note
Agreement"), whereby the Noteholders purchased those certain 12% Senior Secured
General Notes in the aggregate principal amount of $4,000,000.

        B.   The Company and the Noteholders desire to amend and restate the 
Original Note Agreement in its entirety as set forth herein.

        In consideration of the mutual covenants herein contained, the Company 
and the Noteholders agree to amend and restate the Original Note Agreement as 
follows:

                                   ARTICLE I
                               DEFINITIONS, ECT.

        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 Annex A attached hereto (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 construed 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 Persons, 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 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 various


<PAGE>
 
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
                             COMMITMENTS AND NOTES

        Section 2.01. Notes. (a) Subject to the terms and conditions of this 
Agreement, each Noteholder severally agrees to make advances to the Company 
(each an "Advance") during the period from the date hereof through June 30, 1998
(the "Commitment Period") in an aggregate amount not exceeding the principal 
amount specified opposite such Noteholder's name in Schedule A (such amount, as 
it may be reduced or terminated pursuant to this Agreement, is herein referred 
to as such Noteholder's "Commitment"). Each funding of Advances shall be made on
the same dare ratably be the Noteholders. The Advances made by each Noteholder 
shall be evidenced by the Note issued to such Noteholder. Within the limits set 
forth herein and subject to the terms and conditions of this Agreement, the 
Company may borrow, repay pursuant to Section 7.03, prepay pursuant to Section 
7.04 and reborrow under this Article II.

        (b)   The Company will authorize the issue and sale of $5,500,00 
aggregate principal amount of its Amended and Restated 12% Senior Secured 
General Obligation Notes (the "Notes"). Subject to the terms and conditions of 
this Agreement, at the Closing provided for in Article III, the Company will 
issue to each Noteholder a Note in the principal amount of such Noteholder's 
Commitment. The Notes shall be substantially in the form set out in Exhibit 
2.01, with such changes therefrom, if any, as may be approved by the Noteholders
and the Company. Each Noteholder will note on its internal records, to the 
extent applicable, the date and amount of each Advance made by such Noteholder 
to the Company hereunder, and the amount of each payment in respect thereof and 
will prior to any transfer of its Note endorse on the reverse side thereof the 
outstanding principal amount of Advances evidenced thereby. Failure to make any 
such notation shall not affect the Company's obligations in respect of such 
Advance. Absence manifest error, any Noteholder's records or notations on its 
Note as to the outstanding principal amount of its Advances shall be conclusive.

        (c)   Notwithstanding any other term hereof, no Advance shall be made if
after giving effect to the making of such Advance the aggregate amount of 
Advances outstanding would exceed the Total Commitment.

        (d)   If a Change of Control shall occur, the Commitment of each 
Noteholder shall automatically terminate.

        Sections 2.02. Guaranty Agreement. Universal Seismic Associates, Inc., a
Delaware corporation ("USA"), at the Closing provided for in Article III will 
execute an Amended and Restated Guaranty Agreement (the "Guaranty Agreement") 
pursuant to which USA will 


                                      -2-


<PAGE>
 
guarantee payment of the Notes. The Guaranty Agreement shall be substantially in
the form set out in Exhibit 2.02, with such changes therefrom, if any, as may be
approved by the Noteholders and USA.

        Section 2.03. Procedures for Advances Under the Notes. (a) The 
Noteholders have previously made Advances of $4,000,000 which Advances remain 
outstanding as of the date hereof. Subject to the terms and conditions of this 
Agreement, on the day of Closing, the Noteholders shall make Advances in the 
aggregate amount of $500,000.

        (b)   Whenever the Company desires to obtain a funding of additional 
Advances, it shall, no less than 20 Business Days prior to the proposed funding
date for such Advances, provide the Noteholders with the following:

        (i)   a description of the Oil and Gas Properties to be acquired by the 
    Company in connection with such proposed Advance or the oil and gas
    operations to be conducted with the proceeds of such proposed Advance, a
    summary describing the material terms of such acquisition or operations,
    copies of all documents relating to such acquisition or operations, title
    opinions or other title information covering such Oil and Gas Properties in
    form and substance reasonably satisfactory to the Noteholders, and such
    other information pertaining to the Oil and Gas Properties to be acquired,
    or oil and gas operation to be conducted, by the Company in connection with
    such proposed Advances as the Noteholders may reasonably request,

        (ii)   a copy of all geological, geophysical, engineering and other 
    technical data in the possession of the Company, or to which the Company has
    access, pertaining to the Oil and Gas Properties to be acquired or developed
    in connection with such proposed Advances and such other technical
    information as may be reasonably requested by the Noteholders, and

        (iii)   a schedule describing the proposed use of the proceeds of such 
    Advances, which uses shall be permitted under Section 5.13.

        (c)   Within 10 Business Days after receipt of such information and such
other information as the Noteholders shall reasonably request, the Noteholders 
shall provide the Company with a written notice (an "Availability Notice") 
stating the amount, if any, of Advances that the Noteholders are willing to 
fund (as determined by the Noteholders in their sole absolute discretion), 
subject to the other terms and conditions hereof, including the conditions 
specified in Article IV, as well as any other conditions precedent to the 
funding of such Advances that the Noteholders may specify.

        (d)   Subject to the other terms and conditions set forth herein, each 
funding of Advances shall be made upon the written, telecopied or facsimile 
transmitted request of the Company, given to the Noteholders not later than 
12:00 Noon (Houston time) on the fifth Business Day prior to the proposed date 
of such Advances. Each request for Advances (an "Advance


                                      -3-
<PAGE>
 
Request") shall conform to the requirements of the related Availability Notice 
and shall specify therein: (a) the proposed date for such Advances;(b) the 
aggregate amount of such Advances; and (c) the wire transfer instructions for 
such Advances.

        (e)   Upon satisfaction of all conditions to any Advance, the 
Noteholders will make their respective Advances available to the Company by 
delivery to the Company or its order of immediately available funds in the 
amount, stated in the Advance Request by wire transfer of immediately available 
funds for the account of the Company to the bank stated in the Advance Request.

                                  ARTICLE III
                                    CLOSING

        The sale and purchase of the Notes to be purchased by the Noteholders 
shall occur at the offices of Andrews & Kurth, L.L.P., 600 Travis, Houston, 
Texas 77002, at 10:00 a.m., Houston time, at a closing (the "Closing") on March 
27, 1997. At the Closing, the Company will deliver to each Noteholder the Note 
to be purchased by such Noteholder, registered in such Noteholder's name. If at 
the Closing the Company shall fail to tender such Notes to the Noteholders as 
provided above in this Article III, or any of the conditions specified below 
shall not have been fulfilled to the Noteholders' election, be relieved of all 
further obligations under this Agreement, without thereby waiving any rights the
Noteholders may have by reason of such failure or such nonfulfillment.

        The effectiveness of this Agreement is subject to the fulfillment to the
Noteholders' reasonable satisfaction, prior to or at the Closing, of the 
following condition:

        Section 3.01. Execution of Documents. The Noteholder shall have received
the following agreements (together with this Agreement and any agreements 
delivered pursuant to Section 4.01 or Section 9.07, collectively, the 
"Transaction Documents"), in such number of counterparts as the Noteholders may 
reasonably request, each dated the date of the Closing duly executed by the 
Persons indicated below:

        (a)   the Notes duly executed by the Company;

        (b)   the Guaranty Agreement duly executed by USA;

        (c)   the Pledge Agreement duly executed by USA together with 
    certificates representing all of the issued and outstanding common stock of
    the Company and related stock powers duly executed in blank by Parent;

        (d)   amendments to the USA Note Agreements duly executed by USA, in 
    form and substance satisfactory to the Noteholders; and


                                      -4-

<PAGE>
 
         (e)  the Security Agreement duly executed by the Company, together with
     related financing statements.

         Section 3.02. Certificates.  The Company and USA shall have delivered 
to the Noteholders:

         (a)  an Officer's Certificate from the Company, dated the date of the 
     Closing, certifying that the conditions specified in Section 3.04 and
     Section 3.05 have been fulfilled;

         (b)  an Officer's Certificate from USA, dated the date of the Closing,
     certifying that the conditions specified in Section 3.04 and Section 3.05
     have been fulfilled;

         (c)  a certificate certifying as to the resolutions attached thereto
     and other corporate proceedings relating to the authorization, execution
     and delivery of this Agreement and the other Transaction Documents; and

         (d)  certificates of appropriate public officials as to the corporate 
     existence and good standing of, and the payment of all franchise taxes
     owing by, the Company in the States of Delaware, Texas and Louisiana and
     USA in the States of Delaware and Texas.

         Section 3.03. Opinion of Counsel. The Noteholders shall have received
opinions in form and substance satisfactory to the Noteholders, dated the date
of the Closing from Boyer, Ewing & Harris, Incorporated, counsel for the
Company, covering such matters incident to the transactions contemplated hereby
as the Noteholders or the Noteholders' counsel may reasonably request (and the
Company hereby instructs its counsel to deliver such opinion to the
Noteholders).

         Section 3.04.  Representations and Warranties. The representations and 
warranties of the Company and USA in this Agreement and the other Transaction 
Documents shall be true and correct when made and at the time of the Closing.

         Section 3.05.  Performance; No Default. The Company and USA shall have 
performed and compiled with all agreements and conditions contained in this 
Agreement or the other Transaction Documents required to be performed or 
complied with by them prior to or at the Closing and after giving effect to the 
issue and sale of the Notes no Default or Event of Default shall have occurred 
and be continuing.

         Section 3.06.  Payment of Special Counsel Fees. Without limiting the 
provisions of Section 13.01, the Company or USA shall have paid on or before the
Closing the reasonable fees, charges and disbursements of the Noteholders' 
special counsel to the extent reflected in a statement of such counsel rendered 
to the Company at least one Business Day prior to the Closing.

         Section 3.07.  Proceedings and Documents. All corporate and other 
proceedings in connection with the transactions contemplated by this Agreement 
and all documents and

                                      -5-



<PAGE>
 
instruments incident to such transactions shall be satisfactory to the 
Noteholders and the Noteholders' special counsel, and the Noteholders and the 
Noteholders' special counsel shall have received all such counterpart originals 
or certified or other copies of such documents as the Noteholders or they may  
reasonably request.

                                  ARTICLE IV
                            CONDITIONS TO ADVANCES

     Unless otherwise waived by the Noteholders, the Noteholders' obligation to 
fund any Advance is subject to the fulfillment to the Noteholders' reasonable 
satisfaction, prior to or on the date of such Advance, of the following 
conditions:

     Section 4.01. Execution of Documents. The Noteholders shall have received 
the following agreements, in such number of counterparts as the Noteholders may 
reasonably request, each duly executed by the Persons indicated below:

     (a) the Security Documents dated the date of such Advance and duly executed
by the Company granting a first priority Lien in favor of the Noteholders on the
Oil and Gas Properties and other related assets to be acquired or developed by 
the Company in connection with such Advance; and 

     (b) to the extent such Advance is to be used to acquire Oil and Gas 
Properties, assignments of such Oil and Gas Properties acquired by the Company 
and duly executed by the Person from whom the Company is acquiring such Oil and 
Gas Properties in form and substance satisfactory to the Noteholders.

     Section 4.02. Perfection of Liens. The Noteholders shall have received 
evidence, in form and substance satisfactory to the Noteholders, that the Liens 
contemplated by the Security Documents have been duly perfected in accordance 
with applicable law and, upon funding of the Advance and consummation of the
acquisition of the Oil and Gas Properties, will constitute a first priority Lien
on the Oil and Gas Properties and other related assets to be acquired or
developed by the Company in connection with such Advance, including filing of
mortgages, deeds of trust and financing statements in all appropriate filing
jurisdictions.

     Section 4.03. Certificates. The Company shall have delivered to the 
Noteholders: 

     (a) an Officer's Certificate from the Company, dated the date of such
  Advance, certifying that the conditions specified in Section 4.05 and Section
  4.06 have been fulfilled; and

     (b) an Officer's Certificate from USA, dated the date of such Advance, 
  certifying that the conditions specified in Section 4.05 and Section 4.06 have
  been fulfilled.

                                      -6-


<PAGE>
 
     Section 4.04. Insurance. The Noteholders shall have received evidence in 
form and substance satisfactory to the Noteholders, that the Company has the 
insurance required under Section 9.02 covering the Oil and Gas Properties and 
other related assets to be acquired in connection with such Advance.

     Section 4.05. Representations and Warranties. The representations and 
warranties of the Company and USA in this Agreement and the other Transaction 
Documents shall be correct when made and at the time of such Advance.

     Section 4.06. Performance; No Default. After giving effect to such Advance 
(and the application of the proceeds thereof as contemplated by Section 5.13) no
Default or Event of Default shall have occurred and be continuing.

     Section 4.07. Payment of Special Counsel Fees. Without limiting the 
provisions of Section 13.01, the Company shall have paid on or before the date 
of such Advance the reasonable fees, charges and disbursements of the 
Noteholders' special counsel to the extent reflected in a statement of such 
counsel rendered to the Company at least one Business Day prior to the date of 
such Advance.

     Section 4.08. Proceedings and Documents. All corporate and other
proceedings in connection with the transactions related to such Advance and all
documents and instruments incident to such transactions shall be reasonably
satisfactory to the Noteholders and the Noteholders' special counsel, and the
Noteholders and the Noteholders' special counsel shall have received all such
counterpart originals or certified or other copies of such documents as the
Noteholders or they may reasonably request.

     Section 4.09. No Material Adverse Change. No event shall have occurred 
which, in the opinion of the Noteholders shall have a Material Adverse Effect on
the Company, USA or the Oil and Gas Properties to be acquired or developed by 
the Company in connection with such Advance.

                                   ARTICLE V
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company represents and warrants to the Noteholders that:

     Section 5.01. Organization; Power and Authority. The Company is a 
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware, and is duly 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. The Company 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 

                                      -7-
<PAGE>
 
and proposes to transact, to execute and deliver this Agreement and the other 
Transaction Documents and to perform the provisions hereof and thereof.

          Section 5.02.  Authorization, etc. This Agreement and the other 
Transaction Documents to which it is a party have been duly authorized by all 
necessary corporate action on the part of the Company, and this Agreement 
constitutes, and upon execution and delivery thereof each other Transaction 
Document to which it is a party will constitute, a legal, valid and binding
obligation of the Company enforceable against the Company 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 5.03.  Compliance with Laws, Other Instruments, etc. The 
execution, delivery and performance by the Company of this Agreement and the 
other Transaction Documents to which it is a party 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 the Company 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 the
Company is bound or by which the Company or any of its 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 the Company or (c) violate 
any provision of any statute or other rule or regulation or any Governmental 
Authority applicable to the Company.

          Section 5.04.  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 the Company of this Agreement or the other Transaction Documents.

          Section 5.05.  Subsidiaries.  The Company has no Subsidiaries.

          Section 5.06.  Disclosure.  This Agreement, the documents, 
certificates or other writings delivered to the Noteholders by or on behalf of 
the Company in connection with the transactions contemplated hereby, 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.  
There is no fact known to the Company 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 delivered to the Noteholders by or on
behalf of the Company specifically for use in connection with the transactions 
contemplated hereby.

                                      -8-
<PAGE>
 
     Section 5.07.  Litigation. Except as disclosed in Schedule 5.07, there are
no actions, suits or proceedings pending or, to the knowledge of the Company,
threatened against or affecting the Company or any property of the Company in 
any court or before any arbitrator or 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 5.08.  Observance of Agreements, Statutes and Orders. The Company 
is not 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 and is not 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 5.09.  Taxes. The Company has filed all tax returns that are 
required to have been filed in any jurisdiction, and has 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 the Company has established adequate 
reserves in accordance with GAAP. The Company 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 the 
Company in respect of Federal, state or other taxes for all fiscal periods are 
adequate in all material respects.

     Section 5.10.  Title to Property. The Company has good and sufficient title
to its Oil and Gas Properties, if any, and its other Material properties, if 
any, 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 5.11.  Licenses, Permits, etc. The Company owns or possesses 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 the Company, (a) no product of the Company 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 the
Company with respect to any patent, copyright, service mark, trademark, trade 
name or other right owned or used by the Company.


                                      -9-
 







    
<PAGE>
 
        Section 5.12.  Compliance with ERISA.

        (a) The Company and each ERISA Affiliate have operated and administered
each Plan, if any, 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 the Company nor any
ERISA Affiliate has incurred any liability pursuant to Title I or IV or 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 the Company or any ERISA Affiliate, or
in the imposition of any Lien on any of the rights, properties or assets of the
Company 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
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) The Company 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 the Company'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 of
the Code) of the Company is not Material.

        Section 5.13. Use of Proceeds; Margin Regulations. The Company shall use
the Advances made at Closing under Section 2.03(a) to repay Indebtedness owing
to USA. The Company will apply the proceeds of all other Advances to pay for the
acquisition, exploration and development of Oil and Gas Properties acquired or
developed by the Company in connection with such Advances and for other working
capital purposes, in each case, as described in the applicable schedule provided
to the Noteholders under Section 2.03(b)(iii). No part of the proceeds of any
Advance will be used, directly or indirectly, for the purpose of buying or
carrying any margin stock within the meaning of Regulation G of the Board of
Governors of the Federal Reserve System (12 C.F.R. 207), or for the purpose of
buying or carrying or trading in any securities under such circumstances as to
involve the Company in a violation of Regulation X of said Board (12 C.F.R.
224) or to involve any broker or dealer in a violation of Regulation T of said
Board (12 C.F.R. 220).

                                     -10-

<PAGE>
 
        Section 5.14. Status under Certain Statutes. The company is not 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 5.15. Securities Matters. Other than offers to accredited 
Investors, neither the Company nor anyone acting on its behalf has directly or 
indirectly offered the Notes or any part thereof or any similar securities for 
sale to, solicited any offer to buy any of the same from,or otherwise approached
or negotiated in respect thereof with,anyone other than the Noteholders named in
Schedule A. Neither the Company nor anyone acting on its behalf has taken or 
will take any action which would subject the issuance and sale of the Notes to 
the registration and prospectus delivery provisions of the Securities Act.

        Section 5.16. Environmental Matters. The Company has no knowledge of 
any claim and has not received any notice of any claim,and no proceeding has 
been instituted raising any claim against the Company or any of its real 
properties now or formerly owned,leased or operated by the Company or other 
assets,alleging nay damage to the environment or violation of any Environmental 
Laws, except,in each case,such as could not reasonably be excepted to result in 
a Material Adverse Effect. Except as otherwise disclosed to the Noteholders in 
writing,(a) the Company has no 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 formerly owned,leased or operated by the Company or to other 
assets or their use, expect,in each case, such as could not reasonably be 
excepted to result in a Material Adverse Effect; (b) Company has not stored 
any Hazardous Materials on real properties now or formerly owned,leased or 
operated by the Company and has not disposed of nay 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 the 
Company are in compliance with applicable Environmental Laws, except where 
failure to comply could not reasonably be excepted to result in a Material 
Adverse Effect.

                                  ARTICLE VI
                       REPRESENTATIONS OF THE PURCHASER
                
        Section 6.01. Purchase for Investment. Each Noteholder 
represents that it is acquiring its Notes for its own account or for one of its 
separate accounts (or for the account of trusts for which it is trustee) for 
investment with no intention of presently distributing or reselling the 
same,subject,nevertheless,to its right to dispose of, in compliance with all 
applicable securities laws,its respective Notes,or any part of any thereof held 
by it, if at some future time in its sole discretion it deems it advisable so to
do. each Noteholder hereby agrees that it will not sell, transfer or otherwise 
dispose of its Notes in violation of the Securities Act.

                                     -11-
<PAGE>
 
        Section 6.02.  Status; No Registration.  Each Noteholder represents that
it is an Accredited Investor.  Each Noteholder acknowledges that the Notes have
not been registered under the Securities Act, and that such Notes must be held 
indefinitely unless they are subsequently registered under the Securities Act or
an exemption from such registration is available.

                                 ARTICLE VII 
                             PAYMENT OF THE NOTES

        Section 7.01.  Place of Payment.  The Company will pay all sums becoming
due to any Noteholder under any Transaction Document by the method and at the
address specified for such purpose below such Noteholder's name in Schedule A,
or by such other method or at such other address as such Noteholder shall have
from time to time specified to the Company in writing for such purpose, without
the presentation or surrender of such Note or the making of any notation
thereon, except that upon written request of the Company made concurrently with
or reasonably promptly after payment or prepayment in full of any Note, the
Noteholders shall surrender such Note for cancellation, reasonably promptly
after any such request, to the Company at its principal executive office.

        Section 7.02. Payments Due on Non-Business Days. Anything in this
Agreement or the Notes to the contrary notwithstanding, any payment of principal
of or interest on any Note that is due on a date other than a Business Day shall
be made on the next succeeding Business Day without including the additional
days elapsed in the computation of the interest payable on such next succeeding
Business Day.

        Section 7.03.  Mandatory Repayment of Notes.  The Notes shall be due and
payable as follows:

        (a)     from time to time payments in such amounts as shall be necessary
    so that the aggregate amount of Advances outstanding shall not be in excess
    of the Total Commitment. Any repayment required by this Section 7.03(a)
    shall include a payment of accrued but unpaid interest to the date of
    payment on the principal amount paid and shall be due and payable on the
    date such payment accrues pursuant to the preceding sentence;

        (b)     on each Monthly Payment Date, a payment equal to the greater of 
    (i) all accrued, but unpaid interest on the Notes or (ii) 100% of the Net
    Revenues for the immediately preceding month (or, if less, the entire unpaid
    principal of, and accrued interest on, the Notes) shall be due and payable;

        (c)     on December 1, 1999, the entire unpaid principal of the Notes, 
    together with all accrued, but unpaid interest on the Notes, shall be fully
    and finally due and payable; and
        

                                     -12-
<PAGE>
 
        (d)     if a Change of Control shall occur, the entire unpaid principal 
    of the Notes, together with all accrued, but unpaid interest on the Notes,
    shall be fully and finally due and payable on the date one day after such
    Change of Control occurs.

All payments on the Notes shall be applied pro rata, in accordance with the 
principal amounts outstanding on the Notes, first to accrued but unpaid 
interest on the Notes and the remainder, if any, to the principal amount 
outstanding on the Notes.

        Section 7.04.  Optional Prepayment of Notes.  The Company may, at its 
option, without notice, penalty, premium or fee, prepay at any time all, or from
time to time any part of, the Notes at 100% of the principal amount so prepaid,
plus accrued and unpaid interest on such principal amount.  In the case of each 
partial prepayment of the Notes, the principal amount of the Notes to be 
prepaid shall be allocated among all of the Notes at the time outstanding in 
proportion to the respective unpaid principal amounts thereof.

        Section 7.05. Purchase of Notes. The Company will not, and will not
permit any Affiliate to, purchase, redeem, prepay or otherwise acquire,
directly or indirectly, any of the outstanding Notes except upon the payment of
the Notes in accordance with the terms of this Agreement and the Notes. The
Company will promptly cancel all Notes acquired by it or any Affiliate pursuant
to any payment or purchase of Notes pursuant to any provision of this Agreement
and no Notes may be issued in substitution or exchange for any such Notes.

                                 ARTICLE VIII 
                         INFORMATION AS TO THE COMPANY

        Section 8.01.  Financial and Business Information.  The Company shall 
deliver to each of the Noteholders:

        (a) Within 45 days the end of each quarterly fiscal period in each
fiscal year of the Company, copies of (i) a consolidated balance sheet of the
Company as at the end of such quarter, and (ii) consolidated statements of
income, changes in shareholders' equity and cash flows of the Company, 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 the Company 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 the Company,
copies of (i) a consolidated balance sheet of the Company, as at the end of such
year, and (ii) consolidated statements of income, changes in shareholders' 
equity and cash flows of the Company, for such year, setting forth in each case 
in comparative form the figures for the previous fiscal year, all in 


                                     -13-
<PAGE>
 
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 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 the Company as at the end of such month, and (ii) 
consolidated statements of income, changes in shareholders' equity and cash 
flows of the Company, 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 
the Company 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.

      (d) By March 1 and September 1 of each calendar year, beginning September
1, 1997, a reserve report (each a "Reserve Report") in form and substance 
satisfactory to the Noteholders, prepared by an independent petroleum 
engineering firm satisfactory to the Noteholders setting forth as of the 
immediately preceding December 31 or June 30, as applicable, the Future Net 
Revenue for the Company's Oil and Gas Properties. With the delivery of each 
Reserve Report, the Company shall deliver to the Noteholder a certificate from a
Responsible Officer of the Company certifying that the information in the 
Reserve Report is true and correct in all Material respects.
        
      (e) On or before the 20th day of each month, a production report prepared
by the Company setting forth in reasonable detail, the production from, and
Gross Production Proceeds and Deductible Costs attributable to, the Company's
Oil and Gas Properties for the immediately preceding month and such other
information as the Noteholders may reasonably request (each a "Monthly
Production Report").

      (f) Promptly, and in any event within five days after a Responsible 
Officer of the Company becoming aware of the existence of any Default or Event 
of Default or that any Person has given any notice or taken any action with 
respect to a claimed default hereunder or that any Person has given any notice 
or taken any action with respect to a claimed default of the type referred to in
Section 1.01, a written notice specifying the nature and period of existence 
thereof and what action the Company is taking or proposes to take with respect 
thereto.


                                     -14-
<PAGE>
 
      (g) Promptly, and in any event within five days after a Responsible 
Officer of the Company becoming aware of any of the following, a written notice
setting forth the nature thereof and the action, if any, that the Company 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 the Company 
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 the Company 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 the Company or any ERISA Affiliate pursuant to Title I or IV 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.

      (h) Promptly, and in any event within 30 days of receipt thereof, copies 
of any notice to the Company from any Federal or state Governmental Authority 
relating to any order, ruling, statute or other law or regulations that could 
reasonably be expected to have a Material Adverse Effect.

      (i) Within 10 days after the Company acquires, or enters into an 
agreement to acquire, any Oil and Gas Properties that are not acquired by way of
an Advance under the Notes, written notice of such acquisition, including the 
terms of the acquisition, a description of the Oil and Gas Properties acquired 
or to be acquired and such other information related thereto as the Noteholders 
may reasonably request.

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

      Section 8.02. Officer's Certificate. Each set of financial statements 
delivered to a holder of Notes pursuant to Section 8.01(a), Section 8.01(b) or 
Section 8.01(c) shall be accompanied by a certificate of a Senior Financial 
Officer of the Company stating that such officer has reviewed the relevant terms
hereof and has made, or caused to be made, under his or her supervision, a 
review of the transactions and conditions of the Company 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 the Company to comply with any Environmental Law),
specifying the nature and period of


                                     -15-
<PAGE>
 
existence thereof and what action the Company shall have taken or proposes to 
take with respect thereto.

      Section 8.03. Inspection. The Company shall permit the representatives of
each Noteholder, at the expense of the Company and upon reasonable prior notice
to the Company, to visit and inspect any of the offices or properties of the
Company, 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 the Company authorizes
said accountants to discuss the affairs, finances and accounts of the Company),
all at such times and as often as may be requested.

                                 ARTICLE IX
                            AFFIRMATIVE COVENANTS

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

      Section 9.01. Compliance with Law; Contracts. The Company will comply with
all laws, ordinances or governmental rules or regulations to which it 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 its properties or to 
the conduct of its 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. The Company will comply with, and perform its obligations under,
each contract or agreement to which it is a party, unless, in the good faith 
judgement of the Company, the failure to so comply or perform could not 
reasonably be expected to have a Material Adverse Effect. 

      Section 9.02. Insurance. The Company will maintain, with financially sound
and reputable insurers, insurance with respect to its 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 engaged in the same or a similar
business and similarly situated.

      Section 9.03. Maintenance of Properties. The Company will maintain and
keep, or cause to be maintained and kept, its 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 the Company from discontinuing the
operation and the maintenance of any of its properties if such discontinuance is
desirable in the conduct of its business and the Company has concluded that such
discontinuance could not, individually or in the aggregate, reasonably be
expected to have a Material Adverse Effect.

                                     -16-
<PAGE>
 
      Section 9.04. Payment of Taxes and Claims.  The Company will 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 the Company, provided that the Company 
need not pay any such tax or assessment or claims if (i) the amount, 
applicability or validity thereof is contested by the Company on a timely basis 
in good faith and in appropriate proceedings, and the Company has established 
adequate reserves therefor in accordance with GAAP on the books of the Company 
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 9.05.  Corporate Existence, etc.  The Company will at all times 
preserve and keep in full force and effect its corporate existence.  The Company
will at all times preserve and keep in full force and effect all rights and 
franchises of the Company unless, in the good faith judgment of the Company, 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.

      Section 9.06.  Conduct of Operations.  Prior to the end of the Commitment
Period, the Company shall conduct, or cause to be conducted, and pay for each 
of the exploration and development operations described in the schedules 
delivered to the Noteholders under Section 2.03(b)(iii) on the Oil and Gas 
Properties acquired or developed in connection with Advances by the Noteholders.

      Section 9.07. Lien on Oil and Gas Properties. In addition to Liens granted
in favor of the Noteholders under Article IV, upon the written request of the
Noteholders the Company shall immediately execute and deliver to the Noteholders
Security Documents granting a first priority Lien on all other Oil and Gas
Properties and related assets acquired or owned by the Company.


                                   ARTICLE X
                              NEGATIVE COVENANTS

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

      Section 10.01.  Restrictions on Indebtedness.   The Company will not 
create, incur, assume, Guaranty or permit to exist any Indebtedness, except the 
Notes.

      Section 10.02.  Restrictions on Liens.  The Company will not create, 
incur, assume, or permit to exist any Lien with respect to any asset now owned 
or hereafter acquired, except: 

                                     -17-
<PAGE>
 
        (a) Liens in favor of the Noteholders;

        (b) 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, the
     Company;

        (c) 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 9.04;

        (d) 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;

        (e) 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

        (f) Liens (other than liens 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 10.03. Restricted Payments. The Company will not directly or 
     indirectly make or pay (a) any dividend or other distribution on any shares
     of the Company'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 Company'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 10.04. Merger, Consolidation, etc. The Company 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 10.05. Restrictions on Asset Sales. Without the Noteholders'
     prior written consent, the Company will not sell, transfer, assign, convey
     or otherwise dispose of an interest in any asset now owned or hereafter 
     acquired, except for the sale of oil and gas production in the ordinary 
     course of business.

        Section 10.06. Transactions with Affiliates. The Company will not 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, except in the ordinary course and pursuant to the 
     reasonable requirements of the Company's business and upon fair and 
     reasonable terms no less favorable to the  
 

                                     -18-
 
<PAGE>
 
Company than would be obtainable in a comparable arm's-length transaction with a
Person not an Affiliate.

     Section 10.07. Change in Business. The Company will not 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.

                                  ARTICLE XI
                             DEFAULT AND REMEDIES

     Section 11.01. Events of Default. An "Event of Default" shall exist if any 
of the following conditions or events shall occur and be continuing:

     (a)  the Company defaults in the payment of any principal or interest on 
  any Note when the same becomes due and payable, whether at maturity, by 
  declaration or otherwise; or

     (b)  the Company defaults in the performance of or compliance with any term
  contained in Article X, or USA defaults in the performance or compliance with 
  any term of Article VII of the Guaranty Agreement; or

     (c)  the Company or USA defaults in the performance of or compliance with 
  any term contained in the Transaction Documents to which they are a party
  (other than those referred to in paragraph (a) and (b) of this Section 11.01)
  and such default is not remedied within 30 days after the earlier of (i) a
  Responsible Officer obtains actual knowledge of such default or (ii) the
  Company receives written notice of such default from any holder of a Note; or

     (d)  any representation or warranty made in writing by or on behalf of the 
  Company or USA or by any officer of the Company or USA in this Agreement or
  the other Transaction Documents or in any writing furnished in connection with
  the transactions contemplated hereby or thereby proves to have been false or
  incorrect in any Material respect on the date as of which made; or

     (e)  (i) USA, the Company or any other Subsidiary of USA is in default (as 
principal or as guarantor or other surety) in the payment of any principal of or
premium or interest on any Indebtedness that is outstanding in an aggregate 
principal amount of at least $100,000 beyond any period of grace provided with 
respect thereto, or (ii) USA, the Company or any other Subsidiary of USA is in 
default in the performance of or compliance with any term of any evidence of any
Indebtedness in an aggregate outstanding principal amount of at least $100,000 
or of any mortgage, indenture or other agreement relating thereto or any other 
condition exists, and as a consequence of such default or condition such

                                     -19-
<PAGE>
 
Indebtedness has become, or has been declared (or one or more Persons are 
entitled to declare such Indebtedness to be), due and payable before its stated
maturity or before its regularly scheduled dates of payment, or (iii) as a 
consequence of the occurrence or continuation of any event or condition (other 
than the passage of time or the right of the holder of Indebtedness to convert 
such Indebtedness into equity interests), (x) USA, the Company or any other 
Subsidiary of USA has become obligated to purchase or repay Indebtedness before
its regular maturity or before its regularly scheduled dates of payment, in an 
aggregate outstanding principal amount of at least $100,000 or (y) one or more 
Persons have the right to require USA, the Company or any other Subsidiary of 
USA to purchase or repay such Indebtedness; or

     (f) USA, the Company or any other Subsidiary of USA (i) is generally not
paying, or admits in writing its inability to pay, its debts as they become due,
(ii) files, or consents by answer or otherwise to the filing against it of, a
petition for relief or reorganization or arrangement or any other petition in
bankruptcy, for liquidation or to take advantage of any bankruptcy, insolvency,
reorganization, moratorium or other similar law of any jurisdiction, (iii) makes
an assignment for the benefit of its creditors, (iv) consents to the appointment
of a custodian, receiver, trustee or other officer with similar powers with
respect to it or with respect to any substantial part of its property, (v) is
adjudicated as insolvent or to be liquidated, or (vi) takes corporate action for
the purpose of any of the foregoing; or

     (g)   a court or governmental authority of competent jurisdiction enters an
order appointing, without consent by USA, the Company or any other Subsidiary of
USA, a custodian, receiver, trustee or other officer with similar powers with 
respect to it or with respect to any substantial part of its property, or 
constituting an order for relief or approving a petition for relief or 
reorganization or any other petition in bankruptcy or for liquidation or to take
advantage of any bankruptcy or insolvency law of any jurisdiction, or ordering 
the dissolution, winding-up or liquidation of USA, the Company or any other 
Subsidiary of USA, or any such petition shall be filed against USA, the Company
or any other Subsidiary of USA and such petition shall not be dismissed within
60 days; or

     (h) a final judgment or judgments for the payment of money aggregating in
excess of $250,000 are rendered against one or more of USA, the Company and any
other Subsidiary of USA and such judgments are not, within 60 days after entry
thereof, bonded, discharged or stayed pending appeal, or are not discharged
within 60 days after the expiration of such stay; or

     (i)   an "Event of Default" exists under any of the USA Note Agreements; or

     (j) USA fails to own (both beneficially and of record) 100% of the common
stock and other equity securities of the Company; or


                                     -20-
<PAGE>
 
          (k)  if (i) any Plan shall fail to satisfy the minimum funding
     standards of ERISA or the Code for any plan year or part thereof or a
     waiver of such standards or extension of any amortization period is sought
     or granted under section 412 of the Code, (ii) a notice of intent to
     terminate any Plan shall have been or is reasonably expected to be filed
     with the PBGC or the PBGC shall have instituted proceedings under ERISA
     section 4042 to terminate or appoint a trustee to administer any Plan or
     the PBGC shall have notified USA, the Company or any ERISA Affiliate that a
     Plan may become a subject to any such proceedings (iii) the aggregate
     "amount of unfunded benefit liabilities" (within the meaning of section
     4001(a)(18) of ERISA) under all Plans, determined in accordance with Title
     IV of ERISA, shall exceed $25,000, (iv) USA, the Company or any ERISA
     Affiliate shall have incurred or is reasonably expected to incur any
     liability pursuant to Title I or IV of ERISA or the penalty or excise tax
     provisions of the Code relating to employee benefit plan, (v) USA, the
     Company or any ERISA Affiliate withdraws from any Multiemployer Plan, (vi)
     USA, the Company or any ERISA AFFiliate fails to make any contribution due,
     or payment to, any employee benefit plan, or (vii) USA, the Company or any
     other Subsidiary of USA establishes or amends any employee welfare benefit
     plan that provides post-employment welfare benefits in a manner that would
     increase the liability of USA, the Company or any Subsidiary thereunder,
     and any such event or events described in clauses (i) through (vii) above,
     either individually or together with any other such event or events, could
     reasonably be expected to have a Material Adverse Effect. As used in this
     Section 11.01(j), the terms "employee benefit plan" and "employee welfare
     benefit plan" shall have the respective meanings assigned to such terms in
     Section 3 or ERISA.

          Section 11.02.  Acceleration.

          (a)  If an Event of Default with respect to the Company described in 
paragraph (f) or (g) of Section 11.01 (other than an Event of Default described 
in clause (i) of paragraph (f) or described in clause (vi) of paragraph (f) by 
virtue of the fact that such clause encompasses clause (i) of paragraph (f) has 
occurred, (i) all unfunded Commitments shall automatically terminate and (ii) 
all amounts then outstanding under the Notes shall automatically become 
immediately due and payable.

          (b)  If any other Event of Default has occurred and is continuing, the
Required Holders at any time at its or their option, by notice or notices to the
Company, (i) terminate all unfunded Commitments and (ii) declare all amount then
outstanding under the Notes to be immediately due and payable.

          (c)  If any Event of Default described in paragraph (a) of Section 
11.01 has occurred and is continuing, any holder or holders of Notes at the time
outstanding affected by such Event of Default may at any time, at its or their 
option, by notice or notices to the Company, (i) terminate their respective 
Commitments and (ii) declare all amounts then outstanding under the Notes held
by it or them to be immediately due and payable.

                                     -21-
<PAGE>
 
         Upon any Notes becoming due and payable under this Section 11.02,
whether automatically or by declaration, such Notes will forthwith mature and
the entire unpaid principal amount of such Notes, plus all accrued and unpaid
interest thereon, shall all be immediately due and payable, in each and every
case without presentment, demand, notice of default, notice of intent to
accelerate, notice of acceleration, protest or further notice, all of which are
hereby waived.

         Section 11.03. Other Remedies. If any Default or Event of Default has 
occurred and is continuing, and irrespective of whether any Notes have become or
have been declared immediately due and payable under Section 11.02, the holder 
of any Note at the time outstanding may proceed to protect and enforce the 
rights of such holder by an action at law, suit in equity or other appropriate 
proceeding, whether for the specific performance of any agreement contained 
herein or in any Note, or for an injunction against a violation of any of the 
terms hereof or thereof, or in aid of the exercise of any power granted hereby
or thereby or by law or otherwise.

         Section 11.04. No Waivers or Election of Remedies, Expenses, etc. No
course of dealing and no delay on the part of any holder of any Note in
exercising any right, power or remedy shall operate as a waiver thereof or
otherwise prejudice such holder's rights, powers or remedies. No right, power or
remedy conferred by this Agreement or by any Note upon any holder thereof shall
be exclusive of any other right, power or remedy referred to herein or therein
or now or hereafter available at law, in equity, by statute or otherwise.
Without limiting the obligations of the Company under Section 13.01, the Company
will pay to the holder of each Note on demand such further amount as shall be
sufficient to cover all reasonable costs and expenses of such holder incurred in
any enforcement or collection under this Article XI, including, without
limitation, reasonable attorneys' fees, expenses and disbursements, together
with interest on such amounts at the Default Rate accruing from the date of
demand.

                                  ARTICLE XII
                 REGISTRATION; EXCHANGE; SUBSTITUTION OF NOTES

         Section 12.01. Registration of Notes. The Company shall keep at its 
principal executive office a register for the registration and registration of 
transfers of Notes. The name and address of each holder of one or more Notes, 
each transfer thereof and the name and address of each transferee of one or more
Notes shall be registered in such register. Prior to due presentment for 
registration of transfer, the Person in whose name any Note shall be registered 
shall be deemed and treated as the owner and holder thereof for all purposes 
hereof, and the Company shall not be affected by any notice or knowledge to the 
contrary. The Company shall give to any holder of a Note promptly upon request 
therefor, a complete and correct copy of the names and addresses of all 
registered holders of Notes.

                                     -22-

<PAGE>
 
         Section 12.02. Transfer and Exchange of Notes. Subject to compliance 
with all applicable securities laws, upon surrender of any Note at the principal
executive office of the Company for registration of transfer or exchange (and in
the case of a surrender for registration of transfer, duly endorsed or 
accompanied by a written instrument of transfer duly executed by the registered 
holder of such Note or his attorney duly authorized in writing and accompanied 
by the address for notices of each transferee of such Note or part thereof), the
Company shall execute and deliver, at the Company's expense, one or more new 
Notes (as requested by the holder thereof) in exchange therefor, in an aggregate
principal amount equal to the unpaid principal amount of the surrendered Note. 
Each such new Note shall be payable to such Person as such holder may request 
and shall be substantially in the form specified herein. Each such new Note 
shall be dated and bear interest from the date to which interest shall have been
paid on the surrendered Note or dated the date of the surrendered Note if no 
interest shall have been paid thereon.

         Section 12.03. Replacement of Notes. Upon receipt by the Company of 
evidence reasonably satisfactory to it of the ownership of and the loss, theft, 
destruction or mutilation of any Note, and (a) in the case of loss, theft or 
destruction, of indemnity reasonably satisfactory to it (provided that if the 
holder of such Note is, or is a nominee for, an original Noteholder, such 
Person's own unsecured agreement of indemnity shall be deemed to be 
satisfactory), or (b) in the case of mutilation, upon surrender and cancellation
thereof, the Company at its own expense shall execute and deliver, in lieu 
thereof, a new Note, dated and bearing interest from the date to which interest 
shall have been paid on such lost, stolen, destroyed or mutilated Note or dated 
the date of such lost, stolen, destroyed or mutilated Note if no interest shall
have been paid thereon.

                                 ARTICLE XIII
                                 MISCELLANEOUS

         Section 13.01. Transaction Expenses. Whether or not the transactions 
contemplated hereby are consummated, the Company 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, 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 the Company or in connection with any work-out or restructuring
of the transactions contemplated hereby and by the Notes. The Company 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 that those retained by the Noteholders).


                                     -23-

<PAGE>
 
The obligations of the Company under this Section 13.01 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 13.02. 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 the Company
pursuant to this Agreement shall be deemed representations and warranties of the
Company under this Agreement.

     Section 13.03. Amendment and Waiver. This Agreement and the Notes may be 
amended, and the observance of any term hereof or of the Notes may be waived 
(either retroactively or prospectively), with (and only with) the written 
consent of the Company and the Required Holders, except that (a) no amendment or
waiver of any of the provisions of Articles II, III, IV or V, or any defined 
term (as it is used therein), will be effective as to the Noteholders unless 
consented to by all of the Noteholders in writing, and (b) no such amendment or 
waiver may, without the written consent of the holder of each Note at the time 
outstanding affected thereby, (i) subject to the provisions of Article XI 
relating to acceleration or rescission, change the amount or time of any payment
of principal of, or reduce the rate or change the time of payment or method of 
computation of interest on, the Notes, or (ii) change the percentage of the 
principal amount of the Notes the holders of which are required to consent to
any such amendment or waiver. Any amendment or waiver consented to as provided
in this Section 13.03 applies equally to all holders of the Notes and is binding
upon them and upon each future holder of any Note and upon the Company 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, agreement, Default or Event of Default not expressly amended or waived
or impair any right consequent thereon. No course of dealing between the Company
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 13.04. 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 
service (with charges prepaid). Any such notice must be sent: if to a 
Noteholder, to its address specified for such communications in Schedule A, or 
at such other address as it shall have specified to the Company in writing, if 
to the Company, to the Company at 16420 Park Ten Place, Suite 300, Houston, 
Texas 77084, Telecopy No. 713-578-7091, or at such other address as the Company 
shall have specified to the holder of each Note in writing. Notices under this 
Section 13.04 will be deemed given only when actually received.

                                     -24-
<PAGE>
 
     Section 13.05. 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 the Company
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 owned 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. 
Notwithstanding the provisions of Section 13.14, to the extent that the Highest 
Lawful Rate applicable to a Noteholder is at any time determined by Texas law, 
such rate shall be the "indicated rate ceiling" described in Section (a)(1) of 
Article 1.04 of Chapter 1, Title 79, of the Revised Civil Statutes of Texas, 
1925, as amended; provided, however, to the extent permitted by such Article, 
the Noteholders from time to time by notice to Company may revise the aforesaid 
election of such interest rate ceiling as such ceiling affects the then-current 
or future balances of the loans outstanding under the Notes. Notwithstanding any
provision in this Agreement or any other Transaction Document to the contrary, 
if the maturity of the Notes or the obligations in respect of the other 
Transaction Documents are accelerated for any reason, or in the event of 
prepayment of all or any portion of the Notes or the obligations in respect of 
the other Transaction Documents by the Company or in any other event, earned 
interest on the Notes and such other obligations of the Company may never exceed
the maximum amount permitted by applicable law, and any unearned interest 
otherwise payable under the Notes or the obligations in respect of the other 
Transaction Documents that is in excess of the maximum amount permitted by 
applicable law shall be canceled automatically as of the date of such 
acceleration or prepayment or other such event and, if theretofore paid, shall 
be credited on the principal of the Notes or, if the principal of the Notes has 
been paid in full, refunded to the Company. In determining whether or not the 
interest paid or payable, under any specific contingency, exceeds the Highest 
Lawful Rate, the Company and the Noteholders shall, to the maximum extent 
permitted by applicable law, amortize, prorate, allocate and spread, in equal 
parts during the period of the actual term of this Agreement, all interest at 
any time contracted for, charged, received or reserved in connection with the 
Transaction Documents.

     Section 13.06. Indemnification. The Company agrees to indemnify, defend and
hold each Noteholder, their partners and their respective officers, employees, 
agents, directors, partners, affiliates and shareholders (collectively, 
"Indemnified Persons") harmless from and against any and all loss, liability, 
damage, judgment, claim, deficiency or reasonable expense (including interest, 
penalties, reasonable attorneys' fees and amounts paid in settlement) incurred 
by or asserted against any Indemnified Person arising out of, in any way 
connected with, or as a result of (a) the execution and delivery of this 
Agreement and the other documents contemplated hereby, the performance by the 
parties hereto and thereto of their respective obligations hereunder and 
thereunder and consummation of the transactions contemplated hereby and thereby,
(b) the 

                                     -25-
<PAGE>
 
actual or proposed use of the proceeds of the loans contemplated hereby, (c) any
violation by the Company or any of its Subsidiaries of any requirement of law, 
including but not limited to Environmental Laws, (d) any Noteholder being deemed
an operator of any real or personal property of the Company in circumstances in 
which no Noteholder is generally operating or generally exercising control over 
such property, to the extent such losses, liabilities, damages, judgments, 
claims, deficiencies or expenses arise out of or result from any Hazardous 
Materials located in, on or under such property or (e) any claim, litigation, 
investigation or proceeding relating to any of the foregoing, whether or not any
Indemnified Person is a party thereto; provided that such indemnity shall not 
apply to any such losses, claims, damages, liabilities or related expenses that 
are determined by a court of competent jurisdiction by final and nonappealable 
judgment to have resulted from the gross negligence or willful misconduct of, or
willful violation of the Transaction Documents by, such Indemnified Person.  
WITHOUT LIMITING ANY PROVISION OF THIS AGREEMENT OR ANY OF THE OTHER TRANSACTION
DOCUMENTS, IT IS THE EXPRESS INTENTION OF THE PARTIES THAT EACH INDEMNIFIED 
PERSON SHALL BE INDEMNIFIED AND HELD HARMLESS AGAINST ANY AND ALL LOSSES, 
LIABILITIES, CLAIMS, DEFICIENCIES, JUDGMENTS AND REASONABLE EXPENSES ARISING OUT
OF OR RESULTING FROM THE ORDINARY NEGLIGENCE (WHETHER SOLE, CONCURRENT OR 
CONTRIBUTORY) OF SUCH INDEMNIFIED PERSON.  Each Indemnified Person will attempt 
to consult with the Company prior to entering into any settlement of any lawsuit
or proceeding that could give rise to a claim for indemnity under this Section 
13.06, although nothing herein shall give the Company the right to direct, or 
control any such settlement negotiations or any related lawsuit or proceeding on
behalf of such Indemnified Party.  The obligations of the Company under this 
Section 13.06 shall survive the termination of this Agreement and repayment of 
the Notes.

     Section 13.07.  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 13.08.  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 13.09.  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 13.10.  Confidentiality.  In connection with the negotiation and 
administration of this Agreement and the other Transaction Documents, the 
Company has furnished

                                     -26-
<PAGE>
 
and will from time to time furnish the Noteholders certain written information 
(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 Confidential Information in
accordance with such procedures as the Noteholders apply generally to 
information of that nature.  Subject to the prohibitions and restrictions 
imposed on the Noteholders with respect to the Confidential Information under 
applicable securities laws, it is understood that the foregoing will not 
restrict the Noteholders' ability to exchange such Confidential Information with
their current or prospective investors, assignees of the Notes and advisors.  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 the Company as promptly as practicable.  With respect to Confidential 
Information provided to the Noteholders under Section 2.03(a) that relates to 
Oil and Gas Properties on which the Noteholders elect not to make the Advance 
requested by the Company, the Noteholders (i) shall promptly return such 
Confidential Information to the Company (including all copies thereof) upon 
written request from the Company, (ii) shall not use, and shall not permit any
other Person to use, such Confidential Information for any purpose other than 
evaluating the proposed Advance and (iii) acknowledge that such Confidential 
Information shall remain the exclusive property of the Company (subject only to 
any rights the Noteholders may have to such Confidential Information under the 
Security Documents).

     Section 13.11.  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 13.12.  Jury Waiver.  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 13.13.  Choice of Forum.  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 AND STATE 
COURTS OF HARRIS COUNTY, TEXAS, OTHER THAN LEGAL PROCEEDINGS INSTITUTED BY THE

                                     -27-
<PAGE>
 
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 13.14.  Governing Law.  This Agreement and the Notes 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.

     IN WITNESS WHEREOF, 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.


                              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

                                     -28-
<PAGE>
 
                                  SCHEDULE A

                      INFORMATION RELATING TO NOTEHOLDERS

<TABLE>
<CAPTION>
                                                         Principal Amount of
Name and Address of Noteholder                          Notes to be Purchased
- ------------------------------                          ---------------------
<S>                                                     <C>
RIMCO PARTNERS, L.P.                                          $1,430,000
RIMCO PARTNERS, L.P. II                                        1,650,000
RIMCO PARTNERS, L.P. III                                         660,000
RIMCO PARTNERS, L.P. IV                                        1,760,000

                                                              $5,500,000
                                                              ==========
</TABLE>

(1)  All payments by wire transfer
         of immediately available
         funds to:

         Fleet Bank, N.Y.
         ABA No. 021404465
         Account Name:  Universal Seismic Associates, Inc.
                        Automatic Clearing Account
         Account No. 9390641743

     with sufficient information to identify the source and application of such 
     funds.

(2)  All notices of payments and 
         written confirmations of such
         wire transfers:

         Resource Investors Management Company
         22 Waterville Road
         Avon, Connecticut 06001
         Attn:  Doug Skelley
         Telecopy No.: 860-678-9382

                                 Schedule A-1
<PAGE>
 
(3)  All other communications:

         Resource Investors Management Company
         Suite 6875
         600 Travis Street
         Houston, Texas 77002
         Attn:  Gary Milavec
         Telecopy No.: 713-247-0730

               with a copy to

         Resource Investors Management Company
         22 Waterville Road
         Avon, Connecticut 06001
         Attn:  David R. Whitney
         Telecopy No.: 860-678-9382

                                 Schedule A-2
<PAGE>
 
                                    ANNEX A
                                 DEFINED TERMS

     "Accredited Investor" means an "accredited investor" as such term is 
defined in Regulation D, Rule 501, promulgated by the Securities and Exchange 
Commission.

     "Advance" is defined in Section 2.01.

     "Advance Request" is defined in Section 2.03.

     "Affiliate" means, at any time, and with respect to any Person, (a) any 
other Person that at such time directly or indirectly through one or more 
intermediaries Controls, or is Controlled by, or is under common Control with, 
such first Person, and (b) any Person beneficially owning or holding, directly 
or indirectly, 10% or more of any class of voting or equity interests of the 
Company or any Subsidiary or any corporation of which the Company and its 
Subsidiaries beneficially own or hold, in the aggregate, directly or indirectly,
10% or more of any class of voting or equity interests.  As used in this 
definition, "Control" means the possession, directly or indirectly, of the power
to direct or cause the direction of the management and policies of a Person, 
whether through the ownership of voting securities, by contract or otherwise.  
Unless the context otherwise clearly requires, any reference to an "Affiliate" 
is a reference to an Affiliate of the Company.

     "Agreement" means this Amended and Restated Note Purchase Agreement, as 
amended, modified or restated from time to time.

     "Availability Notice" is defined in Section 2.03.

     "Business Day" means any day other than a Saturday, a Sunday or a day on 
which commercial banks in Houston, Texas or New York, New York are required or 
authorized to be closed.

     "Capital Lease" means, at any time, a lease with respect to which the 
lessee is required concurrently to recognize the acquisition of an asset and the
incurrence of a liability in accordance with GAAP.

     "Change of Control" means any of (a) the acquisition by any Person or two 
or more Persons (excluding underwriters in the course of their distribution of 
voting stock in an underwritten public offering) acting in concert, of 
beneficial ownership (within the meaning of Rule 13d-3 promulgated under the 
Security Exchange Act of 1934, as amended) of 35% or more of the outstanding 
shares of voting stock of USA, (b) 50% or more of the members of the Board of 
Directors of USA on any date shall not have been (i) members of the Board of 
Directors of USA on the date 12 months prior to such date or (ii) approved (by 
recommendation, nomination, election or otherwise) by Persons who constitute at 
least a majority of the members of the Board of Directors of USA as constituted 
on the date 12 months prior to such date, (c) all or substantially all of the
<PAGE>
 
assets of USA or the Company are sold in a single transaction or series or 
related transactions to any Person, or (d) USA merges with or consolidates with 
any other Person.

     "Closing" is defined in Article III.

     "Code" means the Internal Revenue Code of 1986, as amended from time to 
time, and the rules and regulations promulgated thereunder from time to time.

     "Commitment Period" is defined in Section 2.01.

     "Commitment" is defined in Section 2.01.

     "Company" is defined in the introduction to this Agreement.

     "Current Assets" means, as of any date, all assets of USA and its 
Subsidiaries that would be reflected as current assets on a consolidated balance
sheet of USA and its Subsidiaries prepared on such date in accordance with GAAP 
consistently applied.

     "Current Liabilities" means, as of any date, all liabilities of USA and its
Subsidiaries that would be reflected as current liabilities on a consolidated 
balance sheet of USA and its Subsidiaries prepared on such date in accordance 
with GAAP consistently applied.

     "Deductible Costs" means, for any month, the sum of the following amounts, 
to the extent such amounts were not deducted in calculating Gross Production 
Proceeds, and without duplication, (a) Lease Operating Expenses for such month 
and severance and production taxes attributable to Gross Proceeds for such 
month.

     "Default" means an event or condition the occurrence or existence of which 
would, with the lapse of time or the giving of notice or both, become an Event 
of Default.

     "Default Rate" means fifteen percent (15%) per annum, but in no event to 
exceed the Highest Lawful Rate.

     "Environmental Laws" means any and all Federal, state, local, and foreign 
statues, laws, regulations, ordinances, rules, judgments, orders, decrees, 
permits, concessions, grants, franchises, licenses, agreements or governmental 
restrictions relating to pollution and the protection of the environment or the 
release of any materials into the environment, including but not limited to 
those related to hazardous substances or wastes, air emissions and discharges to
waste or public systems.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as 
amended from time to time, and the rules and regulations promulgated thereunder 
from time to time in effect.

                                      -2-


<PAGE>
 
     "ERISA Affiliate" means any trade or business (whether or not incorporated)
that is treated as a single employer together with the Company under section 414
of the Code.

     "Event of Default" is defined in Section 11.01.

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

     "Fidelity Funding Agreement" means, collectively, that certain Loan and 
Security Agreement dated as of August 31, 1995, between Universal Seismic 
Acquisition, Inc. and Fidelity Funding, Inc. and that certain Loan and Security 
Agreement, dated August 31, 1995, between Universal Seismic Technologies, Inc. 
and Fidelity Funding, Inc.

     "Future Net Revenue" means the aggregate of the estimated future net 
revenues for each of the Company's Oil and Gas Properties, discounted at 10%, 
attributable to the proved Hydrocarbon reserves for each such Oil and Gas 
Property using average product prices and Lease Operating Expenses for the 
six-month period preceding the date of determination of such future net 
revenues.  The product prices and Lease Operating Expenses for each such Oil and
Gas Property shall not be escalated over the life of such Oil and Gas Property. 
Each determination of Future Net Revenue under the terms of this Agreement shall
also take into account cumulative production from the Oil and Gas Properties 
since the last determination and such other criteria that are required by sound 
petroleum engineering practice.

     "GAAP" means generally accepted accounting principles as in effect from 
time to time in the United States of America.

     "Governmental Authority" means (a) the government of (i) the United States 
of America or any State or other political subdivision thereof, or (ii) any 
jurisdiction in which the Company or any Subsidiary conducts all or any part of 
its business, or which asserts jurisdiction over any properties of the Company 
or any Subsidiary, or (b) any entity exercising executive, legislative, 
judicial, regulatory or administrative functions of, or pertaining to, any such 
government.

     "Gross Production Proceeds" means, for any month, the gross proceeds 
accruing from the sale of Hydrocarbons produced from the Company's Oil and Gas 
Properties during such month.

     "Guaranty" means, with respect to any Person, any obligation (except the 
endorsement in the ordinary course of business of negotiable instruments for 
deposit or collection) of such Person guaranteeing or in effect guaranteeing any
indebtedness, dividend or other obligation of any other Person in any manner, 
whether directly or indirectly, including (without limitation) obligations 
incurred through an agreement, contingent or otherwise, by such Person: (a) to 
purchase such indebtedness or obligation or any property constituting security 
therefor; (b) to advance or supply funds (i) for the purchase or payment of such
indebtedness or obligation, or (ii) to maintain any working capital or other 
balance sheet condition or any income statement condition of any other Person or
otherwise to advance or make available funds for the purchase or payment of such

                                      -3-

<PAGE>
 
indebtedness or obligation; (c) to lease properties or to purchase properties or
services primarily for the purpose of assuring the owner of such indebtedness or
obligation of the ability of any other Person to make payment of the 
indebtedness or obligation; or (d) otherwise to assure the owner of such 
indebtedness or obligation against loss in respect thereof. In any computation 
of the indebtedness or other liabilities of the obligor under any Guaranty, the 
indebtedness or other obligations that are the subject of such Guaranty shall be
assumed to be direct obligations of such obligor. 

     "Guaranty Agreement" is defined in Section 2.02.

     "Hazardous Material" means any and all pollutants, toxic or hazardous 
wastes or any other substances that might pose a hazard to health or safety, the
removal of which may be required or the generation, manufacture, refining, 
production, processing, treatment, storage, handling, transportation, transfer, 
use, disposal, release, discharge, spillage, seepage, or filtration of which is 
or shall be restricted, prohibited or penalized by any applicable law 
(including, without limitation, asbestos, urea formaldehyde foam insulation and 
polycholorinated biphenyls).

     "Highest Lawful Rate" means with respect to any indebtedness owed to any 
Noteholder under any Transaction Document, the maximum nonusurious interest 
rate, if any, that at any time or from time to time may be contracted for, 
taken, reserved, charged or received by such Noteholder with respect to such 
indebtedness under law applicable to such Noteholder. 

     "Hydrocarbons" means oil, natural gas, condensate and all other liquid or 
gaseous hydrocarbons and all products produced or separated therefrom. 

     "holder" means, with respect to any Note, the Person in whose name such
Note is registered in the register maintained by the Company pursuant to Section
12.01.

     "Indebtedness" with respect to any Person means, at any time, without 
duplication, (a) its liabilities for borrowed money and its redemption 
obligations in respect of mandatorily redeemable Preferred Stock; (b) its 
liabilities for the deferred purchase price of property acquired by such Person 
(excluding accounts payable arising in the ordinary course of business but 
including all liabilities created or arising under any conditional sale or other
title retention agreement with respect to any such property); (c) all 
liabilities appearing on its balance sheet in accordance with GAAP in respect of
Capital Leases; (d) all liabilities for borrowed money secured by any Lien with 
respect to any property owned by such Person (whether or not it has assumed or 
otherwise become liable for such liabilities); (e) all its liabilities in 
respect of letters of credit or instruments serving a similar function issued or
accepted for its account by banks and other financial institutions (whether or 
not representing obligations for borrowed money); (f) Swaps of such Person; and 
(g) any Guaranty of such Person with respect to liabilities of a type described 
in any of clauses (a) through (f) hereof. Indebtedness of any Person shall
include all obligations of such Person of the character described in clauses (a)
through (g) to the extent such Person remains legally liable in respect thereof
notwithstanding that any such obligation is deemed to be extinguished under 
GAAP.


                                      -4-
<PAGE>
 
           "Indemnified Person" is defined in Section 13.06.

           "Investment" means, with respect to any Person, any direct or 
indirect purchase or other acquisition by such Person of stock or other 
securities of any other Person, or any direct or indirect loan, advance or 
capital contribution by such Person to any other Person, and any other item 
which would be classified as an "investment" on a balance sheet of such Person 
prepared in accordance with GAAP.

           "Lease Operating Expenses" means, for any month, direct out-of-pocket
costs and expenses incurred during such month by the Company to operate and 
maintain the wells located on the Company's Oil and Gas Properties, including 
fixed overhead costs payable under applicable operating agreements. Without 
limiting the foregoing, Lease Operating Expenses shall not include any land and 
legal fees incurred by the Company, leasehold, seismic or other property 
acquisition costs, or costs to drill, test, complete, equip, deepen, sidetrack, 
recomplete or plug and abandon any well or internal overhead costs.

           "Lien" means, with respect to any Person, any mortgage, lien, pledge,
charge, security interest or other encumbrance of any kind (whether voluntary or
involuntary), or any interest or title of any vendor, lessor, lender or other 
secured party to such Person under any conditional sale or other title retention
agreement or Capital Lease, upon or with respect to any property or asset of 
such Person (including in the case of stock, stockholder agreements, voting 
trust agreements and all similar arrangements).

           "Material" means material in relation to the business, operations, 
affairs, financial condition, assets, properties, or prospects of (a) the 
Company or (b) USA and its Subsidiaries taken as a whole.

           "Material Adverse Effect" means a material adverse effect on (a) the 
business, operations, affairs, financial condition, assets or properties of the 
Company, or USA and its Subsidiaries taken as a whole, or (b) the ability of the
Company or USA, as the case may be, to perform their respective obligations
under this Agreement and the other Transaction Documents, or (c) the validity or
enforceability of this Agreement or the other Transaction Documents.

            "Monthly Payment Date" means the first day of each calender month
commencing April 1, 1997.

           "Monthly Production Report" is defined in Section 8.01(e).

           "Multiemployer Plan" means any Plan that is a "multiemployer plan"
(as such term is defined in section 4001(a)(3) of ERISA).

           "Net Income" means, for any period, the consolidated net earnings of 
USA and its Subsidiaries for such period, determined in accordance with GAAP.

                                      -5-
<PAGE>
 
        "Net Production Revenue" means, for any month, an amount equal to the
excess, if any, of Gross Production Proceeds for such month over Deductible 
Costs for such month.

        "Net Revenue" means, for any month, the sum of (a) the Net Sales
Proceeds for such month plus (b) the Net Production Revenues for the immediately
preceding month.

        "Net Sales Proceeds" means, for any month, the gross proceeds received
during such month by the Company from the sale of any of its Oil and Gas 
Properties, less the reasonable fees, taxes and expenses paid by the Company 
and directly related to the consummation of any such sales transactions.

        "Noteholders" is defined in the introduction to this Agreement.

        "Notes" is defined in Section 2.01.

        "Officer's Certificate" means a certificate of a Senior Financial 
Officer or of any other officer of the Company or USA, as applicable, whose
responsibilities extend to the subject matter of such certificate.

        "Oil and Gas Properties" means oil and gas leasehold interests,
overriding royalty interests, mineral interests, royalty interests, net profits
interests, oil payments, production payments, carried interests, operating
rights and other similar properties or interests, including contractual rights
to any of the foregoing.

        "PBGC" means the Pension Benefit Guaranty Corporation referred to and 
defined in ERISA or any successor thereto.

        "Person" means an individual, partnership, corporation, limited 
liability company, association, trust, unincorporated organization, or a 
government or agency or political subdivision thereof.

        "Plan" means an "employee benefit plan" (as defined in section 3(3) of 
ERISA) that is or, within the preceding five years, has been established or 
maintained, or to which contributions are or, within the preceding five years, 
have been made or required to be made, by the Company or any ERISA Affiliate or
with respect to which the Company or any ERISA Affiliate may have any liability.

        "Pledge Agreement" means that certain Amended and Restated Pledge 
Agreement of even date herewith executed by USA in favor of the Noteholders 
pledging all of the common stock of the Company, as amended from time to time.

        "Preferred Stock" means any class of capital stock of a corporation 
that is preferred over any other class of capital stock of such corporation as 
to the payment of dividends or the payment of any amount upon liquidation or 
dissolution of such corporation. 



                                      -6-

<PAGE>
 
     "Required Holders" means, at any time, the holder or holders of at least 
51% in principal amount of the Notes at the time outstanding (exclusive of Notes
then owned by the Company or any of its Affiliates).

     "Reserve Report" is defined in Section 8.01(d).

     "Responsible Officer" means any Senior Financial Officer and any other 
officer of the Company or USA, as applicable, with responsibility  for the 
administration of the relevant portion of this Agreement.

     "Securities Act" means the Securities Act of 1933, as amended from time to 
time.

     "Security Agreement" means that certain Security Agreement of even date 
herewith executed by the Company in favor of the Noteholders as same may be 
amended or restated from time to time.

     "Security Documents" means the Security Agreement and mortgages, deeds of 
trust, security agreements and assignments of production in form and substance 
satisfactory to the Noteholders granting a first priority Lien in favor of the 
Noteholders on the Oil and Gas Properties and other related assets of the
Company and such other security agreements, guaranties, pledges, instruments,
financing statements or other documents which may be executed to secure the
obligations of the Company and USA with respect to the Notes and this Agreement
and the other Transaction Documents.

     "Senior Financial Officer" means any of the chief financial officer, 
principal accounting officer, treasurer or comptroller of the Company or USA, as
applicable.

     "Subsidiary" means, as to any Person, any corporation, association or other
business entity in which such Person or one or more of its Subsidiaries or such 
Person and one or more of its Subsidiaries owns sufficient equity or voting 
interests to enable it or them (as a group) ordinarily, in the absence of 
contingencies, to elect a majority of the directors (or Persons performing 
similar functions) of such entity, and any partnership or joint venture if more 
than a 50% interest in the profits or capital thereof  is owned by such Person 
or one or more of its Subsidiaries or such Person and one or more of its 
Subsidiaries (unless such partnership can and does ordinarily take major 
business actions without the prior approval of such Person or one or more of its
Subsidiaries). Unless the context otherwise clearly requires, any reference to a
"Subsidiary" is a reference to a Subsidiary of USA.

     "Swaps" means, with respect to any Person, payment obligations with 
respect to interest rate swaps, currency swaps and similar obligations 
obligating such Person to make payments, whether periodically or upon the 
happening of a contingency. For the purposes of this  Agreement, the amount of 
the obligation under any Swap shall be the amount determined in respect thereof 
as of the end of the then most recently ended fiscal quarter of such Person, 
based on the assumption that such Swap had terminated at the end of such fiscal 
quarter, and in making such 

                                      -7-
<PAGE>
 
determination, if any agreement relating to such Swap provides for the netting 
of amounts payable by and to such Person thereunder or if any such agreement 
provides for the simultaneous payment of amounts by and to such Person, then in 
each such case, the amount of such obligation shall be the net amount so 
determined.

          "Tangible Net Worth" means, as of any date, the total shareholder's 
equity (including capital stock, additional paid-in capital and retained 
earnings after deducting treasury stock) which would appear on a consolidated 
balance sheet of USA and its Subsidiaries prepared as of such date in accordance
with GAAP, minus (i) the amount of any assets resulting from capitalization of 
goodwill, organizational expenses, research and development expenses, 
trademarks, trade names, copyrights patents, patent applications, licenses and 
rights in any thereof, and other similar intangibles, (ii) cash held in a 
sinking or other analogous fund established for the purpose of redemption, 
retirement or prepayment of capital stock or Indebtedness, and (iii) the amount 
of any other items which are treated as intangible assets in accordance with 
GAAP.

          "Total Commitment" means, as of any date, an amount equal to the sum 
of the Noteholders' Commitments, as of such date.

          "Transaction Documents" is defined in Section 4.01.

          "USA" is defined in Section 2.02.

          "USA Note Agreements" means, collectively, (i) that certain Note 
Purchase Agreement, dated January 19, 1996, among USA and the Noteholders, as 
amended by that certain First Amendment dated as of May 28, 1996, that certain 
Second Amendment dated as of August 13, 1996, that certain Third Amendment dated
as of December 20, 1996, that certain Fourth Amendment dated of even date 
herewith and as same may be amended or restated in the future, (ii) that certain
Note Purchase Agreement, dated May 28, 1996, among USA and the Noteholders 
(other than RIMCO Partners, L.P. III), as amended by that certain First 
Amendment dated as of December 20, 1996, that certain Second Amendment and 
Amendment of Notes dated of even date herewith and as same may be amended or 
restated in the future, and that certain Note Purchase Agreement dated of even 
date herewith, among USA and the Noteholders, as same may be amended or restated
in the future.

          "USA Notes" means the 10% Senior Secured General Obligation Notes in 
the aggregate principal amount of $10,000,000 and the 12% Senior Secured General
Obligation Notes in the aggregate principal amount of $2,000,000 issued by USA 
under the USA Note Agreements, together with any replacements, substitutions, 
extensions, modifications and restatements thereof.

                                      -8-



               
<PAGE>
 
                                 SCHEDULE 5.07

                                  Litigation


                                     None
<PAGE>
 
                                 Exhibit 2.01

                                 UNEXCO, INC.

                             AMENDED AND RESTATED
                  12% SENIOR SECURED GENERAL OBLIGATION NOTE

No. SN-1                                                         March ___, 1997
$__________

         FOR VALUE RECEIVED, the undersigned, UNEXCO, INC., a Delaware 
corporation (the "Company"), hereby promises to pay to ______________________, a
Delaware limited partnership, or registered assigns, the principal sum of 
______________________ and ____/100 DOLLARS ($______________), or, if less, the 
aggregate unpaid principal amount of all Advances (as defined in the Note 
Purchase Agreement referred to below) or made by __________________ under the 
Original Note (as defined below) or this Note, 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 twelve percent (12%) 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 is one of a series of Amended and Restated 12% Senior Secured
General Obligation Notes (herein called the "Notes") issued pursuant to the 
Amended and Restated Note Purchase Agreement dated of even date herewith (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 in substitution, modification, renewal and increase, but 
not in extinguishment, novation or discharge, of the indebtedness originally 
evidenced by that certain 12% Senior Secured General Obligation Note dated 
December 20, 1996 in the original principal amount of ________________________
($___________) issued by the Company in favor of ______________ (the "Original 
Note"). The Company agrees that the obligations of the Company under the Note 
Purchase Agreement, the Security Documents and the other Transaction Documents 
(as defined in the Note Purchase Agreement) executed in connection with or as 
security for the Original Note, as amended, or the indebtedness evidenced 
thereby, or by this Note are renewed, ratified, brought forward



<PAGE>
 
and extended for the benefit of ___________________ until the indebtedness 
evidenced hereby shall have been fully paid and discharged.

         The principal balance of this Note and accrued interest thereon shall 
be due and payable at the places, the times and in the manner specified in the 
Note Purchase Agreement. Each Advance made by _______________ to the Company and
all payments made on account of the principal amount thereof shall be entered by
______________ in its records or on the grid attached hereto which is part of 
this Note.

         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.

         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.

         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:
                                            ----------------------------
                                       Title:
                                             ---------------------------


                                    Page 2

<PAGE>
 
                ADVANCES, MATURITIES, AND PAYMENTS OF PRINCIPAL


<TABLE> 
<CAPTION> 
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   Date      Amount of    Maturity of     Amount of     Unpaid Principal     Notation Made
              Advance       Advance     Principal Paid      Balance               By     
                                          or Prepaid
- ----------------------------------------------------------------------------------------------
<S>          <C>          <C>           <C>             <C>                  <C> 
- ----------------------------------------------------------------------------------------------

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

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

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

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

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

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

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

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

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

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- ----------------------------------------------------------------------------------------------
</TABLE> 

                                    Page 3
<PAGE>
 
                                                                    Exhibit 2.02

                    AMENDED AND RESTATED GUARANTY AGREEMENT

        This AMENDED AND RESTATED GUARANTY AGREEMENT dated as of March 27, 1997 
is from UNIVERSAL SEISMIC ASSOCIATES, INC., a Delaware corporation ("USA"), to 
RIMCO PARTNERS, L.P., a Delaware limited partnership, 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 entered into a Note Purchase Agreement dated as of
December 20, 1996 (the "Original Note Agreement") with UNEXCO, INC. (the
"Company"), a wholly-owned subsidiary of USA, whereby the Noteholders purchased
from the Company its 12% Senior Secured General Obligation Notes in the maximum
aggregate principal amount of $4,000,000. USA executed and delivered to the
Noteholders that certain Guaranty Agreement dated December 20, 1996, whereby USA
unconditionally and irrevocably guaranteed the Company's obligations under the
Original Note Agreement (the "Original Guaranty Agreement"). The Company and the
Noteholders have entered into that certain Amended and Restated Note Purchase
Agreement (the "Amended Note Agreement"), dated of even date herewith, whereby
the Company and the Noteholders amended and restated the Original Note Agreement
and whereby the Noteholders purchased from the Company its Amended and Restated
12% Senior Secured General Obligation Notes in the maximum aggregate principal
amount of $5,500,000 (such notes, together with all substitutions,
replacements, extensions, modifications and restatements thereof, being
referred to herein, collectively as the "Notes"), which Notes are in
substitution, modification, renewal and increase, but not in extinguishment,
novation or discharge, of the indebtedness evidenced by the Company's 12% Senior
Secured General Obligation Notes issued under the Original Note Agreement. USA
and the Noteholders desire to amend and restate the Original Guaranty Agreement
to provide for USA's unconditional and irrevocable guarantee of the Company's
obligations under the Amended Note Agreement and the Notes, all as more
particularly set forth herein. It is a condition precedent to the obligation of
the Noteholders to make Advances under the Amended 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 Amended Note Agreement.

        In consideration of the premises and other good and valuable 
consideration, USA and the Noteholders agree to amend and restate the Original 
Guaranty Agreement as follows:
<PAGE>
 
                                  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 Amended 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 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 Amended 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.

                                      -2-
<PAGE>
 
     Section 2.02.  Guaranty Absolute.  USA unconditionally guarantees that the 
Obligations will be paid strictly in accordance with the terms of the Amended 
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 Amended 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 Amended 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 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 right 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

                                      -3-
<PAGE>
 
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; Ect.  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 it 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 Amended 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 and security
securing payment of the Obligations to the liens and security interest on said
collateral and security in favor of the Noteholders, but the forgoing 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 Amended Note Agreement, the Notes and all other 
instruments and documents executed by the Company, or any Person in connection 
with the Amended 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,

                                      -4-

<PAGE>
 
in whole or in part, of any of the sums due any Noteholders pursuant to the 
terms of the Amended Note Agreement or hereunder is rescinded or must otherwise
by 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 Amended Note Agreement shall be deemed to have been
declared in default with the same effect as if the Amended 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 thereunder 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.

          Section 2.09.  Security.  USA's obligations under this Agreement are 
secured by the Pledge Agreement in favor of the Noteholders.

          Section 2.10.  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
the Agreement.

                                  ARTICLE III

                            Intentionally Omitted.


                                  ARTICLE IV
                     REPRESENTATION 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 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

                                      -5-
<PAGE>
 
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 to which USA is a party 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 to which
USA is a party 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 to which USA is a party 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 or 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.

        Section 4.06. Financial Statements. The consolidated balance sheet of 
USA and its Subsidiaries as at June 30, 1996, and the related consolidated 
statements of income, retained

       
                                      -6-
<PAGE>
 
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 case of 
any interim financial statements, to normal year-end adjustments).

      Section 4.07. Disclosure. This Agreement, the documents, certificates or 
other writing 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, 1996, 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 excepted 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 writing (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 excepted 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 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

                                      -7-
<PAGE>
 
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, 1996.

          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 
allocable to such benefit liabilities.  The term "benefit liabilities" has the 
meaning specified in 

                                      -8-
<PAGE>
 
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 5,234,109
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.

                                      -9-
      
<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 20 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.


                                     -10-
<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 Multi-employer Plan that such action has been
taken by the PBGC with respect to such Multi-employer 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 


                                     -11-

<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


                                     -12-



<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.

                                 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;


                                     -13-
 
<PAGE>
 
     (b)  the USA Notes;

     (c)  Indebtedness outstanding under the Fidelity Funding Agreement;

     (d)  Indebtedness with respect to the financing of insurance premiums over 
  the term in which the applicable insurance coverage is in place and not to
  exceed one year, which financing is currently conducted through AFCO
  Financing.

     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 Agreements;

     (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

     (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 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

                                     -14-
<PAGE>
 
     amounts outstanding under the Fidelity Funding Agreement that are not due 
     within one year of such date;


         (b)  its Tangible Net Worth at any time to be less than $7,000,000; and

         (c)  the sum, determined as of the last day of each calendar month, 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.

         Section 7.04.  Restricted Payments. 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.
 
         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.


                                     -15-
<PAGE>
 
     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, 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.

                                     -16-
<PAGE>
 
          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
service (with charges prepaid). Any such notice must be sent: if to a
Noteholder, to its address specified for such communications in Schedule A to
the Amended Note Agreement, or at such other address as it shall have specified
to USA in writing, 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.

                                     -17-
<PAGE>
 
     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 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 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.

                                     -18-
<PAGE>
 
        Section 8.12. Choice of Forum. USA 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.


                                     -19-
<PAGE>
 
     IN WITNESS WHEREOF, USA 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:
                                   -----------------------------------
                                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:
                                   -----------------------------------
                                Name:  Gary Milavec
                                Title: Vice President

                                     -20-
<PAGE>
 
                                 SCHEDULE 4.05


                                 Subsidiaries
                                 ------------










                                 Schedule 4.05
<PAGE>
 
                                 SCHEDULE 4.08



                                  Litigation
                                  ----------








                                 Schedule 4.08
<PAGE>
 
                                 SCHEDULE 6.02



                                   Insurance
                                   ---------









                                 Schedule 6.02
<PAGE>
 
                                 SCHEDULE 7.02













                                 Schedule 7.02

<PAGE>
 
                   ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K

       1.2. Amended and Restated Guaranty Agreement dated March 27, 1997
                        between the Company and RIMCO.
<PAGE>
 
                    AMENDED AND RESTATED GUARANTY AGREEMENT

     This AMENDED AND RESTATED GUARANTY AGREEMENT dated as of March 27, 1997 is 
from UNIVERSAL SEISMIC ASSOCIATES, INC. a Delaware corporation ("USA"), to RIMCO
PARTNERS, L.P., a Delaware limited partnership, 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 entered into a Note Purchase Agreement dated as of December
20, 1996 (the "Original Note Agreement") with UNEXCO, INC. (the "Company"), a 
wholly-owned subsidiary of USA, whereby the Noteholders purchased from the 
Company its 12% Senior Secured General Obligation Notes in the maximum aggregate
principal amount of $4,000,000 USA executed and delivered to the Noteholders 
that certain Guaranty Agreement dated December 20, 1996, whereby USA 
unconditionally and irrevocably guaranteed the Company's obligations under the 
Original Note Agreement (the "Original Guaranty Agreement"). The Company and the
Noteholders have entered into that certain Amended and Restated Note Purchase 
Agreement (the "Amended Note Agreement"), dated of even date herewith, whereby 
the Company and the Noteholders amended and restated the Original Note Agreement
and whereby the Noteholders purchased from the Company its Amended and Restated 
12% Senior Secured General Obligation Notes in the maximum aggregate principal 
amount of $5,500,000 (such notes, together with all substitutions, replacements,
extensions, modifications and restatements thereof, being referred to herein, 
collectively as the "Notes"), which Notes are in substitution, modification, 
renewal and increase, but not in extinguishment, novation or discharge, of the 
indebtedness evidenced by the Company's 12% Senior Secured General Obligation 
Notes issued under the Original Note Agreement. USA and the Noteholders desire 
to amend and restate the Original Guaranty Agreement to provide for USA's 
unconditional and irrevocable guarantee of the Company's obligations under the 
Amended Note Agreement and the Notes, all as more particularly set forth herein.
It is a condition precedent to the obligation of the Noteholders to make
Advances under the Amended 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 Amended Note
Agreement.

     In consideration of the premises and other good and valuable consideration,
USA and the Noteholders agree to amend and restate the Original Guaranty
Agreement as follows:
<PAGE>
 
                                   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 Amended 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 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 Amended 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.

                                      -2-
<PAGE>
 
          Section 2.02.  Guaranty Absolute.  USA unconditionally guarantees that
the Obligations will be paid strictly in accordance with the terms of the
Amended 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
Amended 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 Amended
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 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 if 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 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 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 

                                      -3-

<PAGE>
 
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 Amended 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 foregoing shall in no event 
imply or be construed to imply the Noteholders' agreement or consent to the 
existence of any such security interest 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 Amended Note Agreement, the Notes and all other 
instruments and documents executed by the Company, or any other Person in 
connection with the Amended 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,

                                      -4-
<PAGE>
 
in whole or in part, of any of the sums due any Noteholders pursuant to the 
terms of the Amended 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 Amended Note Agreement shall be deemed to
have been declared in default with the same effect as if the Amended 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.

     Section 2.09.  Security.  USA's obligations under this Agreement are 
secured by the Pledge Agreement in favor of the Noteholders.

     Section 2.10.  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


                            Intentionally Omitted.



                                  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 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  

                                      -5-
<PAGE>
 
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 to which USA is a party 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 to which
USA is a party 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 to which USA is a party 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 of 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.

     Section 4.06.  Financial Statements.  The consolidated balance sheet of USA
and its Subsidiaries as at June 30, 1996, and the related consolidated 
statements of income, retained

                                      -6-
<PAGE>
 
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 it 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, 1996, 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 excepted 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 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, Statues 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, judgement, 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 on 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 of validity of which is currently being contested in good faith by
appropriate proceedings and with respect to which USA 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

                                      -7-


<PAGE>
 
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, 1996.

          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 
allocable to such benefit liabilities.  The term "benefit liabilities" has the 
meaning specified in 

                                      -8-
<PAGE>
 
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 
5,234,109 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.

                                      -9-
<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 20 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.

                                     -10-
<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

                                     -11-














<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 if 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 perspective 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 failure 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

                                     -12-
<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.

                                  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;

                                     -13-
<PAGE>
 
         (b)  the USA Notes;

         (c)  Indebtedness outstanding under the Fidelity Funding Agreement;

         (d)  Indebtedness with respect to the financing of insurance premiums 
     over the term in which the applicable insurance coverage is in place and
     not to exceed one year, which financing is currently conducted through AFCO
     Financing.

         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, 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 Agreements;

         (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 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

         (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 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


                                     -14-
<PAGE>
 
  amounts outstanding under the Fidelity Funding Agreement that are not due 
  within one year of such date;

     (b) its Tangible Net Worth at any time to be less than $7,000,000; and

     (c) the sum, determined as of the last day of each calendar month, 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.

     Section 7.04.  Restricted Payments.  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.

     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.

                                     -15-
<PAGE>
 
     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, 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.

                                     -16-
<PAGE>
 
     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. Not 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
service (with charges prepaid). Any such notice must be sent: if to a
Noteholder, to its address specified for such communications in Schedule A to
the Amended Note Agreement, or at such other address as it shall have specified
to USA in writing, 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.

                                     -17-
<PAGE>
 
     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 provision 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 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
restriction 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 interest 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 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.

                                     -18-
<PAGE>
 
          Section 8.12.  Choice of Forum. USA 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.

                                     -19-
<PAGE>
 
     IN WITNESS WHEREOF, USA 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
                             
                             
                             
                                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

                                     -20-

<PAGE>
 
                                 SCHEDULE 4.05
                           To the Guaranty Agreement

              Subsidiaries of Universal Seismic Associates, Inc.


<TABLE> 
<CAPTION> 
                                         Jurisdiction          Percentage
Subsidiary                             of Incorporation        Ownership
- ----------                             ----------------        ----------
<S>                                    <C>                     <C> 
Universal Seismic Acquisition, Inc.         Texas                  100%
Universal Seismic Technologies, Inc.        Texas                  100%
Marine Automated Surveys, Inc.              Texas                  100%
Unexco, Inc.                               Delaware                100%
</TABLE> 
<PAGE>
 
                                 SCHEDULE 4.08
                           To the Guaranty Agreement

                                  Litigation

1.       No. 95-09-462; The Shamrock Pipe Line Corporation vs. Mitchell Energy
         Corporation, Universal Seismic Acquisition, Inc., Buford Drilling, Inc.
         and Marine Automated Surveys, Inc.; In the 271st Judicial District
         Court of Wise County, Texas ("Shamrock Pipe").
                                       -------------

Universal Seismic Associates, Inc. ("USA") and Marine Automated Surveys, Inc. 
("MAS") are defendants in the above action in which the plaintiffs have alleged 
that one or more of the defendants caused the plaintiffs' pipe to rupture as a 
result of negligent conduct of seismic testing, resulting in down time and lost 
gasoline. Presently USA's insurance company has assumed the defense and has 
hired counsel to represent it in the case. MAS is a wholly-owned subsidiary of 
USA which was formed for the purpose of acquiring the assets, including the 
tradename, of a now dissolved corporation. The asset acquisition occurred after 
the alleged incident giving rise to this suit. Accordingly, plaintiff's counsel 
believes that the former owner of the corporate name Marine Automated Surveys, 
now known as JBX Corporation, will be joined and that all claims with respect to
MAS will be dismissed.

2.       No. 95-12-630; Dessie Schluter, et al. v. Mitchell Energy Corp., et 
         al.; In the 271st Judicial District Court of Wise County, Texas.

This action, which arose out of the same set of facts as Shamrock Pipe, was 
                                                         -------------
brought by the owners of the real property upon which the pipeline in Shamrock 
                                                                      --------
Pipe lies for recovery of damages to such property.
- ----

3.       Michael T. Kanarellis, Robert J. Kecseg and the Universal Seismic
         Associates, Inc. Shareholders' Protective Committee v. Universal
         Seismic Associates, Inc., et al.; Civil Action No. 97-22 in United
         States District Court for the District of Delaware.

         This is a case brought by dissident shareholders which originally 
sought revocation of proxies submitted in favor of existing management-sponsored
members of the Board of Directors of the Company. The Directors sponsored by 
management were elected by a substantial majority of the voting shares and the 
District Court declined to overturn the result. The suit was then amended to add
claims against the Company and all of its Board members sounding in fraudulent 
misrepresentation and non-disclosure of financial information relevant to the 
Company.

4.       Universal Seismic Associates v. Michael T. Kanarellis and Robert T.
Kecseg; Cause No. 97-12684 in the 334th District Court of Harris County, Texas.

         This is a case brought against the defendants jointly for breaches of 
fiduciary duty, disclosure of confidential information and tortious interference
resulting from the defendants' disclosure of various confidential information of
the Company to the public. The defendants have not answered the suit at this 
time.


<PAGE>
 
                                 SCHEDULE 6.02

                           To the Guaranty Agreement

Schedule of Insurance
- --------------------------------------------------------------------------------
<TABLE> 
<CAPTION> 
- ------------------------------------------------------------------------------------------------------------------------------------
   TYPE OF COVERAGE          POLICY          INSURER                        POLICY NO.      LIMITS              DEDUCTIBLE
                              DATES                                                                            
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                        <C>         <C>                                  <C>          <C>                   <C>                 
Commercial                 4/19/95-96  Ranger Lloyds                        GL 705035    $1,000,000               $1,000 Per Claim
General Liability                                                                        Each Occurrence          Employer Benefits
                                                                                         $2,000,000                   Liability
                                                                                         General Aggregate     
- ------------------------------------------------------------------------------------------------------------------------------------
Business Auto Liability &  4/19/95-96  Ranger County Mutual Insurance       TBA 452156   $1,000,000               Refer to Summary
Physical Damage                        Company                                           BI/PD CSL             
                                                                                         Each Occurrence       
- ------------------------------------------------------------------------------------------------------------------------------------
Workers' Compensation &    4/27/95-    Insurance Company of the State       8773134(TX)  Sec A: Statutory              None
Employers' Liability       4/19/96     of Pennsylvania (AIG)                8773135(OS)  Sec B: 1,000,000      
                                                                            8773136(CA)  Maritime: 1,000,000   
                                                                                         U.S.L&H Included      
- ------------------------------------------------------------------------------------------------------------------------------------
Umbrella Liability         4/19/95-96  National Union Fire Insurance Co.    BE3097160    $5,000,000 Each          $10,000 SIR
                                       (AIG)                                             Occurrence            
- ------------------------------------------------------------------------------------------------------------------------------------
Commercial Property/       4/19/95-96  Hartford Lloyds Insurance Co.        61UECLC6597  $230,000 Off. Cont.      1,000 Cont.
Electronic Equipment                                                                     $290,000 Elec. Equip.  $250 Elec. Equip 
                                                                                                                Per Occurrence
- ------------------------------------------------------------------------------------------------------------------------------------
Contractors Equipment      4/19/95-96  Hartford Insurance Company           61MSLC5767   $ 13,533,648          $25,000 Theft
                                                                                                               $10,000 AOP
                                                                                                               Per Occurrence
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
  
<PAGE>
 
<TABLE> 
<CAPTION> 

- -----------------------------------------------------------------------------------------------------------------------------------
TYPE OF COVERAGE                   POLICY          INSURER                     POLICY NO.       LIMITS          DEDUCTIBLE
                                   DATES                                                                     
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>         <C>                               <C>          <C>                <C> 
Directors & Officers Liability  9/19/94-95  Aetna Casualty & Surety Company   095001738BCA $2,000,000 occ/agg Refer to Summary
- -----------------------------------------------------------------------------------------------------------------------------------
Foreign Liability Package -     2/22/95-96  CIGNA Insurance Company           PFF047474    $1,000,000 occur.      None
General Liability/Auto Liab./                                                                                
Workers Comp. & Empl. Liab.                                                                                  
- -----------------------------------------------------------------------------------------------------------------------------------
Marine Package - Australian      3/15/95     HIH Casualty & General Insurance  MOA9510340  Charterers - $ 5M  Charterers - $7,500
                                            Ltd.                                           Hull - $412,500        Hull - $5,000
                                to Job                                                     Cargo - As Sched.      Cargo - $5,000 
                                Completion                                                 P&I - $ 5M              Each Incident
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
<PAGE>
 
                                 SCHEDULE 7.02
                           To the Guaranty Agreement

                                Permitted Liens

Universal Seismic Associates, Inc.:

<TABLE> 
<CAPTION> 
     Secured Party                                State/Cty.     Filing No.
     -------------                                ----------     ----------
     <S>                                          <C>            <C> 
     *Sentry Financial Corporation                    MS           646988
     *Sentry Financial Corporation                    NM         920722029
     *Sentry Financial Corporation                    OK           037535
     *Sentry Financial Corporation                    TX         92-142154
     *Sentry Financial Corporation                    LA         09-911764
</TABLE> 

Universal Seismic Acquisition, Inc.:

<TABLE> 
<CAPTION> 
     Secured Party                                State/Cty.     Filing No.
     -------------                                ----------     ----------
     <S>                                          <C>            <C> 
     *Sentry Financial Corporation                    MS           599774
     *Sentry Financial Corporation                    NM         911223031
     *Sentry Financial Corporation                    OK           062451
     -Fidelity Funding, Inc.                          TX         95-172732
     *Sentry Financial Corporation                    LA         09-904369
</TABLE> 

Universal Seismic Technologies, Inc.:

<TABLE> 
<CAPTION> 
     Secured Party                                State/Cty.     Filing No.
     -------------                                ----------     ----------
     <S>                                          <C>            <C> 
     -Fidelity Funding, Inc.                          TX         95-197830
     -Fidelity Funding, Inc.                          TX         95-204420
</TABLE> 

Marine Automated Surveys, Inc.:

<TABLE> 
<CAPTION> 
     Secured Party                                State/Cty.     Filing No.
     -------------                                ----------     ----------
     <S>                                          <C>            <C> 
     Connecticut General Life Insurance Co.           TX         91-023503
</TABLE> 

*-    Such lien shall be a "Permitted Lien" only to the extent such lien covers 
      the equipment described on Annex I to this Schedule 7.02.

- -.    Such lien shall be a "Permitted Lien" only to the extent such lien does 
      not cover the collateral that is subject to the Security Documents.

                                  Page 1 of 3
<PAGE>
 
                                 SCHEDULE 7.02
                           To the Guaranty Agreement

                                Permitted Liens

The following financing statements were filed for informational purposes and 
relate to operating leases with respect to certain equipment currently in the 
possession of, but not owned by or recorded as an asset of, Universal Seismic 
Associates, Inc. or its Subsidiaries:

Universal Seismic Associates, Inc.:

<TABLE> 
<CAPTION> 

        Secured Party                                State/Cty.        Filing No.
        -------------                                ----------        ----------
        <S>                                          <C>               <C> 
        Newcourt Credit Group, Inc.                     AL              B 95-22202
        Newcourt Credit Group, Inc.                     MS                895255
        Newcourt Credit Group, Inc.                     NM              950530096
        Newcourt Credit Group, Inc.                     OK                NO1752
        Glesby-Marks Corporation                        TX              94-026517
        Glesby-Marks Corporation                        TX              94-028683
        Glesby-Marks Corporation                        TX              94-053248
        Glesby-Marks Corporation                        TX              94-105220
        Glesby-Marks Corporation                        TX              94-172325
        Glesby-Marks Corporation                        TX              94-191289
        Glesby-Marks Corporation                        TX              94-219776
        LDI Corporation                                 TX              94-224526
        Glesby-Marks Corporation                        TX              94-224801
        Glesby-Marks Corporation                        TX              94-224802
        Glesby-Marks Corporation                        TX              94-232430
        Glesby-Marks Corporation                        TX              94-238037
        Glesby-Marks Corporation                        TX              94-238038
        Glesby-Marks Corporation                        TX              95-128331
        Glesby-Marks Corporation                        TX              95-204213
        Glesby-Marks Corporation                        TX              95-204214
        Glesby-Marks Corporation                        TX              95-204215
        Glesby-Marks Corporation                        TX              95-221807
        Glesby-Marks Corporation                        TX              95-221808
        Newcourt Credit Group, Inc.                     TX              94-105653
        NYNEX Credit Company                            TX              95-230465
        NYNEX Credit Company                        Harris (TX)           903208
        US Bankcorp                                     TX              95-126024
        Global Charter Corporation                      LA              36-110792
        Glesby-Marks Corporation                        TX              96-053243
</TABLE> 


                                  Page 2 of 3
<PAGE>
 

                                 SCHEDULE 7.02
                           To the Guaranty Agreement

                                Permitted Liens


        Secured Party                               State/Cty.     Filing No.
        -------------                               ----------     ----------

        Glesby-Marks Corporation                        TX         96-053244
        Glesby-Marks Corporation                        TX         96-074562
        Glesby-Marks Corporation                        TX         96-098976
        Glesby-Marks Corporation                        TX         96-098977
        Glesby-Marks Corporation                        TX         96-119416
        Glesby-Marks Corporation                        TX         96-119417
        Glesby-Marks Corporation                        TX         96-132529
        Glesby-Marks Corporation                        TX         96-141075
        Global Charter Corporation                      TX         96-184776


Universal Seismic Acquisition, Inc.:

        Secured Party                               State/Cty.     Filing No.
        -------------                               ----------     ----------

        NYNEX Credit Company                            TX         95-230466
        NYNEX Credit Company                        Harris (TX)      903207





                                  Page 3 of 3
<PAGE>
 
                            ANNEX I TO SCHEDULE 7.0

I.    Equipment:

<TABLE> 
<CAPTION> 
Qty             Vendor                  Description                                  Serial No.
- ---             ------                  -----------                                  ----------
<S>             <C>                     <C>                                           <C> 

32              Input/Output            RSX I/O System Two
2               Input/Output            Adv, Line-Tap, I/O System Two
50              Input/Output            Battery Pack, Single TC, Type 7
2               Input/Output            Battery Charger, I/O SO Port
2               Input/Output            PC Assy, Seismic Memory
3               Input/Output            PC Assy, Seismic Memory
11              Input/Output            Rack Assy., RSC
600             Mark Products           Geophone Strings w/12 L-200 Geophone and 2 MPS-4 Connectors
108             Mark Products           Variable Spacing 9 Takeout 1080 Ft. RSC to RSC Cables
54              Mark Products           RSC to RSC Back to Back Connectors
4               Mark Products           Long Distance LT to LT Cables 1500 Ft. Long
4               Mark Products           LT to Near RSC 7 Ft. Long
200             Mark Products           MJC w/d200, 10HZ, 380 OHM Geophones Installed 
                                        in Case with 3" Spike on 180 Foot Lead w/MPS-4's
25              Mark Products           RSC to RSC Cable 1050 Foot Long w/Amphip 20F-16S Connectors
8               Mark Products           1600 Foot LT to LT I/O Cables, Coil and Tape
5               Pelton Company          FGVCE-5 Advance II Vibrator Control Elect. Unit Ver. 5
40              Pelton Company          WGEXTC External Control Cables
5               Pelton Company          WGRD Remote Down Cable
5               Pelton Company          FGV18CPA-4 Connector Panel Cable
5               Pelton Company          FGLIFT Lift Cable Assembly with Actuators
5               Pelton Company          WRIBC Radio Interconnect Box
5               Pelton Company          W2RC Radio Cable
10              Pelton Company          FGDACCA-5 Dual MS Accelerometer
5               Pelton Company          AM2MAN ESG/VIB Manual Ver. 5
5               Pelton Company          YR3rd Party/Third Party Royalty Fee
1               Pelton Company          FGESG-5 Advance II Endcode Sweep Generator System Ver. 5
1               Pelton Company          WESGRSC-5 ESG Recording System Cable
1               Pelton Company          WRIBC Radio Interconnect Box
2               Pelton Company          AM2MAN-5 ESG/VIB Manuals Ver. 5
</TABLE> 
II.   Security Deposits - all security deposits (and the proceeds and products 
    thereof) held by Sentry

<PAGE>
 
















                   ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K



       1.3   Amended and Restated Pledge Agreement dated March 27, 1997 
                        between the Company and RIMCO.
<PAGE>
 
                     AMENDED AND RESTATED PLEDGE AGREEMENT

        THIS AMENDED AND RESTATED PLEDGE AGREEMENT (this "Agreement") dated 
March 27, 1997 is made by UNIVERSAL SEISMIC ASSOCIATES, INC., a Delaware 
corporation ("USA"), with an office at 16420 Park Ten Place, Houston, Texas 
77084 to RIMCO PARTNERS, L.P., a Delaware limited partnership, 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"), all with an office at 600 Travis, Suite 6875,
Houston, Texas 77002.

        Preliminary Statement. The Noteholders entered into a Note Purchase 
Agreement dated as of December 20, 1996 with UNEXCO, INC. (the "Company"), a 
Delaware corporation and wholly-owned subsidiary of USA (the "Original Note 
Agreement"), whereby the Noteholders purchased from the Company its 12% Senior 
Secured General Obligation Notes in the maximum aggregate principal amount of 
$4,000,000. USA executed and delivered to the Noteholders that certain Guaranty 
Agreement dated December 20, 1996, whereby USA unconditionally and irrevocably 
guaranteed the Company's obligations under the Original Note Agreement (the 
"Original Guaranty Agreement"). To secure USA's obligations under the Original
Guaranty Agreement, USA executed and delivered that certain Pledge Agreement 
dated December 20, 1996 to the Noteholders (the "Original Pledge Agreement").

        The Company and the Noteholders have entered into that certain Amended 
and Restated Note Purchase Agreement (the "Amended Note Agreement"), dated of 
even date herewith, whereby the Company and the Noteholders amended and restated
the Original Note Agreement and whereby the Noteholders purchased from the 
Company its Amended and Restated 12% Senior Secured General Obligation Notes in 
the maximum aggregate principal amount of $5,500,000 (such notes, together with
all substitutions, replacements, extensions, modifications and restatements
thereof, being referred to herein, collectively as the "Notes"), which Notes are
in substitution, modification, renewal and increase, but not in extinguishment,
novation or discharge, of the indebtedness evidenced by the Company's 12% Senior
Secured General Obligation Notes issued under the Original Note Agreement.

        In connection with the Amended Note Agreement, USA and the Noteholders 
have entered into that certain Amended and Restated Guaranty Agreement, dated of
even date herewith (as same may be amended from time to time being referred to 
herein as the "Amended Guaranty Agreement"), whereby, among other things, USA 
has unconditionally and irrevocably guaranteed 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 Amended Note Agreement, the Notes or any of the other 
Transaction Documents (as such term is defined in the Amended Note Agreement). 
USA and the Noteholders desire to amend and restate the Original Pledge 
Agreement to secure USA's obligations under the Amended Guaranty Agreement, all 
as more particularly set forth herein. USA is the owner of all of the issued and

<PAGE>
 
outstanding shares of common stock of the Company (the "Pledged Shares"). It is 
a condition precedent to the obligation of the Noteholders to make Advances 
under the Amended Note Agreement that USA shall have made the pledge 
contemplated by this Agreement.

        Now, Therefore, in consideration of the premises and other good and 
valuable consideration, USA and the Noteholders hereby agree to amend and 
restate the original Pledge Agreement as follows:

        Section 1. Defined Terms and Related Matters.

        (a) The capitalized terms used herein which are defined in the Amended
    Note Agreement and not otherwise defined herein shall have the meanings
    specified therein.

        (b) 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.

        (c) Unless otherwise defined herein or in the Amended Note Agreement,
    the terms defined in Articles 8 and 9 of the Uniform Commercial Code as
    currently in effect in the State of New York are used herein as therein
    defined.

        Section 2.  Grant of Security.  USA hereby pledges to the Noteholders, 
and grants to the Noteholders a security interest in, the following (the 
"Pledged Collateral"):

        (a) the Pledged Shares and the certificates representing the Pledged
    Shares, and all dividends, cash, instruments and other property from time to
    time received, receivable or otherwise distributed in respect of or in
    exchange for any or all of the Pledged Shares;

        (b) all additional shares of stock of the Company from time to time
    acquired by USA in any manner, and the certificates representing such
    additional shares, and all dividends, cash, instruments and other property
    from time to time received, receivable or otherwise distributed in respect
    of or in exchange for any or all of such shares; and

        (c) all proceeds of any of the foregoing.

        This inclusion of proceeds in this Agreement does not authorize USA to 
sell, dispose of or otherwise use the Pledged Collateral in any manner not 
specifically authorized hereby.

        Section 3. Security for Obligations. This Agreement secures the prompt
and complete (a) payment of all obligations of USA to the Noteholders now or
hereafter existing under the Amended Guaranty Agreement or the other Transaction
Documents (including, without limitation, any interest accruing after the filing
of any petition or pleading in a bankruptcy or similar proceeding), and (b)
performance and observance by USA of all obligations, covenants and

                                      -2-
<PAGE>
 
conditions contained in the Amended Guaranty Agreement and the other Transaction
Documents (including, without limitation, the obligations, covenants and
conditions contained herein), whether for principal, interest, fees, expenses or
otherwise (all such obligations, covenants and conditions described in the
foregoing clauses (a) and (b) being hereinafter collectively referred to as the
"Obligations").

        Section 4. Delivery of Pledged Collateral. All certificates representing
the Pledged Collateral shall be delivered to and held by or on behalf of the
Noteholders pursuant hereto and shall be in suitable form for transfer by
delivery, duly endorsed in blank without restriction, or shall be accompanied by
duly executed instruments of transfer or assignment in blank, all in form and
substance satisfactory to the Noteholders. The Noteholders shall have the right,
at any time in their sole discretion and without notice to USA, to transfer to
or to register in the names of the Noteholders any or all of the Pledged
Collateral, subject only to the revocable rights specified in Section 7(a)
hereof and, prior to a foreclosure sale or other disposition of the Pledged
Collateral, the beneficial ownership of USA. In addition, the Noteholders shall
have the right at any time to exchange certificates representing Pledged
Collateral for certificates of smaller or larger denominations.

        Section 5. Representations and Warranties. USA represents and warrants
as follows:

        (a)     The Pledged Shares have been duly authorized and validly issued 
and are fully paid and non-assessable.

        (b)     USA is the legal, record and beneficial owner of the Pledged 
Collateral free and clear of any lien, security interest, options or other 
charge or encumbrance except for the security interest created by this 
Agreement.

        (c)     The delivery of the Pledged Shares to the Noteholders pursuant 
to this Agreement creates a valid and perfected first priority security interest
in the Pledged Collateral, securing the payment of the Obligations.

        (d)     No authorization, approval, or other action by, and no notice to
or filing with, any governmental authority or regulatory body or other Person is
required either (i) for the pledge by USA of the Pledged Collateral pursuant to
this Agreement or for the execution, delivery or performance of this Agreement
by USA or (ii) for the exercise by the Noteholders of the voting or other rights
provided for in this Agreement or the remedies in respect of the Pledged
Collateral pursuant to this Agreement (except as may be required in connection
with such disposition by laws affecting the offering and sale of securities
generally).

        (e)     The Pledged Shares constitute one hundred percent (100%) of the 
issued and outstanding shares of stock of the Company.

                                      -3-
<PAGE>
 
     Section 6. Further Assurances. USA agrees that from time to time, at the 
expense of USA, USA will promptly execute and deliver all further instruments 
and documents, and take all further action, that may be necessary or desirable, 
or that the Noteholders may request, in order to perfect and protect any 
security interest granted or purported to be granted hereby or to enable the 
Noteholders to exercise and enforce their rights and remedies hereunder with 
respect to any Pledged Collateral. USA will furnish to the Noteholders from time
to time statements and schedules further identifying and describing the Pledged 
Collateral and such other reports in connection with the Pledged Collateral as 
the Noteholders may reasonably request, all in reasonable detail.

     Section 7. Voting Rights; Dividends; Etc. (a) So long as no Event of 
Default shall have occurred and be continuing and the Noteholders have not 
delivered the notice specified in Section 7(b):

     (i)   USA shall be entitled to exercise any and all voting and other 
  consensual rights pertaining to the Pledged Collateral or any part thereof for
  any purpose not inconsistent with the terms of this Agreement, the Amended
  Guaranty Agreement or the other Transaction Documents.

     (ii)  USA shall be entitled to receive and retain any and all dividends 
  paid in respect of the Pledged Collateral to the extent, and only to the
  extent, such dividends are permitted under the Amended Note Agreement,
  provided, however, that all (A) dividends paid or payable other than in cash
  --------  -------
  in respect of, and instruments and other property received, receivable or
  otherwise distributed in respect of, or in exchange for, any Pledged
  Collateral, (B) dividends and other distributions paid or payable in cash in
  respect of any Pledged Collateral in connection with a partial or total
  liquidation or dissolution or in connection with a reduction of capital,
  capital surplus or paid-in-surplus, and (C) cash paid, payable or otherwise
  distributed in redemption of, or in exchange for, any Pledged Collateral,
  shall be, and shall be forthwith delivered to the Noteholders to hold as,
  Pledged Collateral and shall, if received by USA, be received in trust for the
  benefit of the Noteholders, be segregated from the other property or funds of
  USA, and be forthwith delivered to the Noteholders as Pledged Collateral in
  the same form as so received (with any necessary endorsement).

     (b)   Upon the occurrence and during the continuance of an Event of
Default, at the option of the Noteholders exercised in a writing sent to USA:

     (i)   All rights of USA to exercise the voting and other consensual rights 
  which it would otherwise be entitled to exercise pursuant to Section 7(a)(i)
  shall cease, and the Noteholders shall thereupon have the sole right to
  exercise such voting and other consensual rights.

     (ii)  All rights of USA to receive the dividends which it would otherwise 
  be entitled to receive and retain pursuant to Section 7(a)(ii) shall cease,
  and the Noteholders shall thereupon have the right to receive and hold as
  Pledged Collateral such dividends.

                                      -4-
<PAGE>
 
     (iii) All dividend payments which are received by USA contrary to the 
provisions of paragraph (ii) of this Section 7(b) shall be received in trust 
for the benefit of the Noteholders, shall be segregated from other funds of USA 
and shall be forthwith paid over the Noteholders as Pledged Collateral in the 
same form as so received (with any necessary endorsement).
  
     Section 8. Transfers and Other Liens. USA shall not: (a) sell, assign (by 
agreement, operation of law or otherwise) or otherwise dispose of, or grant any
option with respect to, any of the Pledged Collateral; or (b) create or suffer 
to exist any Lien upon or with respect to any of the Pledged Collateral, except 
for the security interest created by this Agreement. USA agrees that it will 
cause the Company not to issue any stock or other equity securities in addition 
to or in substitution for the Pledged Shares.

     Section 9. Noteholders Appointed Attorney-in-fact. USA hereby irrevocably 
appoints the Noteholders USA's attorney-in-fact, with full authority in the 
place and stead of USA and in the name of USA, the Noteholders or otherwise, 
from time to time while an Event of Default exists in the Noteholders' sole 
discretion, to take any action and to execute any instrument which the 
Noteholders may deem necessary or advisable to accomplish the purposes of this 
Agreement, including, without limitation, to receive, endorse and collect all 
certificates or instruments made payable to USA representing any dividend or 
other distribution in respect of the Pledged Collateral. 

     Section 10. Noteholders May Perform. If USA fails to perform any agreement 
contained herein, the Noteholders may themselves perform, or cause performance 
of, such agreement, and the reasonable expenses of the Noteholders incurred in 
connection therewith shall be payable by USA under Section 14.

     Section 11. The Noteholders' Duties. The powers conferred on the 
Noteholders hereunder are solely to protect their interest in the Pledged 
Collateral and shall not impose any duty upon them to exercise any such powers. 
Except for reasonable care in the custody of any Pledged Collateral in their 
possession and the accounting for moneys actually received by them hereunder, 
the Noteholders shall have no duty as to any Pledged Collateral or as to the 
taking of any neccessary steps to preserve rights against prior parties or any 
other rights pertaining to any Pledged Collateral. The Noteholders shall be 
deemed to have exercised reasonable care in the custody and preservation of any 
Pledged Collateral in their possession if such Pledged Collateral is accorded 
treatment substantially equal to that which the Noteholders accord their own 
property, it being understood that the Noteholders shall not have any 
responsibility for (a) ascertaining, or taking action with respect to calls, 
conversions, exchanges or other matters relative to the Pledged Collateral, 
whether the Noteholders have knowledge of such matters, or (b) taking any 
necessary steps to preserve rights against any parties with respect to any 
Pledged Collateral.

     Section 12, Remedies. If any Event of Default shall have occurred and be 
continuing :

     (a) The Noteholders may exercise in respect of the Pledged Collateral, in 
addition to the rights and remedies provided for herein or otherwise available 
to them, all rights

                                      -5-
<PAGE>
 
and remedies of a secured party on default under the Uniform Commerical Code in
effect in the State of New York (as amended from time to time, the "the Code")
(whether or not the Code applies to the affected Pledged Collateral) and the
Noteholders may also, without notice except as specified below, sell the Pledged
Collateral or any part thereof in one or more parcels at public or private sale,
at any of the Noteholder's offices or elsewhere, for cash, on credit or for
future delivery, and upon such other terms as the Noteholders may deem
commercially reasonable. USA agrees that, to the extent notice of sale shall be
required by law, at least ten (10) days' notice to USA of the time and place of
any public sale or the time after which any private sale is to be made shall
constitute reasonable notification thereof. The Noteholders shall not be
obligated to make any sale of Pledged Collateral regardless of notice of sale
having been given. The Noteholders may adjourn any public or private sale from
time to time by announcement at the time and place fixed therefor, and such sale
may, without further notice, be made at the time and place to which it was so
adjourned.

      (b)   Any cash held by the Noteholders as Pledged Collateral and all cash 
proceeds received by the Noteholders in respect of any sale of, collection from,
or other realization upon all or any part of the Pledged Collateral may, in the 
sole discretion of the Noteholders, be held by the Noteholders as collateral 
for, and/or then or at any time thereafter applied (after payment of any amounts
payable to the Noteholders pursuant to Section 14) pro rata to and for the 
Noteholders in the following order of priority:first, to the Noteholders in 
proportion to the aggregate amount of Obligations then owing to each such 
Noteholder under the Amended Guaranty Agreement, and second, to the Noteholders 
in proportion to the aggregate amount of all other Obligations then owing to 
each such Noteholder. Any surplus of such cash proceeds held by the Noteholders 
and remaining after payment in full of all the Obligations shall be paid over to
USA or to whomsoever may be lawfully entitled to receive such surplus.

      (c)   All rights and remedies of the Noteholders expressed herein are in 
addition to all other rights and remedies possessed by the Noteholders in the 
Amended Note Agreement, the Amended Guaranty Agreement and any other agreement 
or instrument relating to the Obligations.

      Section 13.   Private Sale of Pledged Collateral. USA recognizes that the 
Noteholders may be unable to effect a public sale of any or all the Pledged 
Collateral by reason of certain prohibitions contained in the laws of any 
jurisdiction outside the United States or in the Securities Act and applicable 
state securities laws, but may instead be compelled to resort to one or more 
private sales thereof to a restricted group of purchasers who will be obliged to
agree, among other things, to acquire such Pledged Collateral for their own 
account for investment and not with a view to the distribution or resale 
thereof. USA acknowledges and agrees that any such private sale may result in 
prices and other terms less favorable to the seller than if such sale were a 
public sale and, notwithstanding such circumstances, agrees that no such private
sale shall be deemed not to have been made in a commercially reasonable manner 
solely because the sales price received is lower than the price that could have 
been obtained at a public sale. The Noteholders shall not be under any 

                                      -6-
<PAGE>
 
obligation to delay a sale of any of the Pledged Collateral for the period of 
time necessary to permit the Company to register such securities under the laws 
of any jurisdiction outside the United States, under the Securities Act or under
any applicable state securities laws, even if the Company would agree to do so.

     Section 14. Indemnity and Expenses.

     (a)  USA HEREBY INDEMNIFIES THE NOTEHOLDERS AND THE OTHER INDEMNIFIED 
  PERSONS FROM AND AGAINST ANY AND ALL CLAIMS, LOSSES AND LIABILITIES GROWING
  OUT OF OR RESULTING FROM THIS AGREEMENT (INCLUDING, WITHOUT LIMITATION,
  ENFORCEMENT OF THIS AGREEMENT), EXCEPT CLAIMS, LOSSES OR LIABILITIES RESULTING
  FROM THE NOTEHOLDERS' OR OTHER INDEMNIFIED PERSONS' GROSS NEGLIGENCE OR
  WILLFUL MISCONDUCT. IT IS THE EXPRESS INTENTION OF USA THAT THE NOTEHOLDERS
  AND THE OTHER INDEMNIFIED PERSONS SHALL BE INDEMNIFIED AND HELD HARMLESS
  AGAINST ANY AND ALL LOSSES, LIABILITIES, CLAIMS, DEFICIENCIES, JUDGMENTS OR
  EXPENSES ARISING OUT OF OR RESULTING FROM THE ORDINARY NEGLIGENCE (WHETHER
  SOLE, CONCURRENT OR CONTRIBUTORY) OR STRICT LIABILITY OF THE NOTEHOLDERS OR
  THE OTHER INDEMNIFIED PERSONS.

     (b)  USA will upon receipt of an invoice pay to the Noteholders the amount 
  of any and all expenses, including the reasonable fees and disbursements of
  their counsel and of any experts and agents, that the Noteholders may incur in
  connection with (i) the administration of this Agreement, (ii) the evaluation,
  appraisal, custody, preservation, use or operation of, or the sale of,
  collection from, or other realization upon, any of the Pledged Collateral,
  (iii) the exercise or enforcement of any of the rights of the Noteholders
  hereunder or (iv) the failure by USA to perform or observe any of the
  provisions hereof. USA agrees to pay interest on any expenses or other sums
  payable to the Noteholders hereunder that are not paid when due at a rate per
  annum equal to the lesser of (i) the Highest Lawful Rate and (ii) the Default
  Rate.

     Section 15. Amendments, Etc. No amendment or waiver of any provision of 
this Agreement, nor consent to any departure by USA herefrom, shall in any event
be effective unless the same shall be in writing and signed by the Noteholders 
and USA, and then such waiver or consent shall be effective only in the specific
instance and for the specific purpose for which given.

     Section 16. Addresses for Notices. All notices and other communications 
provided for hereunder shall be given in the manner and at the addresses, and 
shall become effective as, specified in the Amended Note Agreement. The address 
and telecopy number for USA shall be the same as those for USA set forth in the 
Amended Guaranty Agreement.

     Section 17. Waiver of Marshaling. All rights of marshaling of assets of 
USA, including any such right with respect to the Pledged Collateral, are hereby
waived by USA.

                                      -7-
<PAGE>
 
     Section 18. Limitation by Law. All the provisions of this Agreement are 
intended to be subject to all applicable mandatory provisions of law which may 
be controlling and to be limited to the extent necessary so that they will not 
render this Agreement invalid, unenforceable, in whole or in part, or not 
entitled to be recorded, registered of filed under the provisions of any 
applicable law.

     Section 19. Separability. Should any clause, sentence, paragraph, 
subsection or Section of this Agreement be judicially declared to be invalid, 
unenforceable or void, such decision will not have the effect of invalidating or
voiding the remainder of this Agreement, and the parties hereto agree that the 
part or parts of this Agreement so held to be invalid, unenforceable or void 
will be deemed to have been stricken herefrom by the parties hereto, and the 
remainder will have the same force and effectiveness as if such stricken part or
parts had never been included herein. 

     Section 20. Captions. The captions in this Agreement have been inserted for
convenience only and shall be given no substantive meaning or significance 
whatever in construing the terms and provisions of this Agreement.

     Section 21. 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.

     Section 22. Execution in Counterparts. This Agreement may be executed in 
any number of counterparts and by different parties hereto in separate 
counterparts, each of which when so executed shall be deemed to be an original 
and all of which taken together shall constitute but one and the same agreement.

     Section 23. Continuing Security Interest; Transfer of Notes. This Agreement
shall create a continuing security interest in the Pledged Collateral and shall 
(i) remain in full force and effect until payment in full of the Obligations and
termination of the Commitments, (ii) be binding upon USA, its successors and 
assigns and (iii) inure to the benefit of the Noteholders and their respective 
successors, transferees and assigns. Without limiting the generality of the 
foregoing clause (iii), each Noteholder may assign or otherwise transfer all or
a portion of any of the Notes held by it to any other Person, and such other
Person (other than USA, the Company or their Affiliates) shall thereupon become
vested with all the benefits in respect thereof granted to such Noteholder
herein or otherwise. Upon the payment in full of the Obligations and termination
of the Commitments, the security interest granted hereby shall terminate and all
rights to the Collateral shall revert to USA. Upon any such termination, USA
shall be entitled to the return, upon its request and at its expense, of such of
the Pledged Collateral as shall not have been sold or otherwise applied against
the Obligations pursuant to the terms hereof.

                                      -8-
<PAGE>
 
         Section 24. Security Interest Absolute. All rights of the Noteholders
and security interests hereunder, and all obligations of USA hereunder, shall be
absolute and unconditional irrespective of:

         (a) any lack of validity or enforceability of the Amended Guaranty 
     Agreement or the other Transaction Documents unless such lack of validity
     and enforceability results from a failure of consideration;

         (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 any departure from the Amended Guaranty
     Agreement or the other Transaction Documents;

         (c) any exchange, release or non-perfection of any other collateral, or
     any release or amendment or waiver of or consent to departure from any
     guaranty, for all or any of the Obligations; or

         (d) any other circumstance which might otherwise constitute a defense 
     available to, or a discharge of, the Company or USA.

         Section 25. Survival of Representations and Warranties. All 
representations and warranties contained in this Agreement or made in writing by
or on behalf of USA in connection herewith shall survive the execution and 
delivery of this Agreement and repayment of the Obligations. Any investigation 
by the Noteholders shall not diminish in any respect whatsoever their rights to 
rely on such representations and warranties.

         Section 26. Jury Waiver. USA 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 27. Choice or Forum. USA 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.

         Section 28. Governing Law; Terms. This Agreement shall be governed by 
and construed in accordance with the laws of the State of New York, except as 
required by mandatory provisions of law and except to the extent that the 
validity or perfection of the security interest hereunder, or remedies
hereunder, in respect of any particular Collateral are governed by the laws of a
jurisdiction other than the State of New York.

         Section 29. Effect on Original Pledge Agreement. This Agreement amends 
and restates in its entirety the Original Pledge Agreement; provided that 
nothing herein is intended to 

                                      -9-
<PAGE>
 
release, extinguish, or effect the priority of the security interest in the 
Pledged Collateral granted by the Original Pledge Agreement.

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

                                  UNIVERSAL SEISMIC ASSOCIATES, 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


                                     -10-

<PAGE>
 







                   ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K



1.4.  FOURTH AMENDMENT TO NOTE PURCHASE AGREEMENT (1/19/96) DATED MARCH 27, 1997
                        BETWEEN THE COMPANY AND RIMCO.

<PAGE>
 
                  FOURTH AMENDMENT TO NOTE PURCHASE AGREEMENT

     This Fourth Amendment to Note Purchase Agreement (this "Fourth Amendment") 
dated as of March 27, 1997 is between UNIVERSAL SEISMIC ASSOCIATES, INC., a 
Delaware corporation (the "COMPANY"), and RIMCO PARTNERS, L.P., a Delaware 
limited partnership, 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 by that 
certain First Amendment dated May 28, 1996, that certain Second Amendment dated 
August 13, 1996 and that certain Third Amendment dated December 20, 1996 (as so 
amended, the "NOTE AGREEMENT").

     B.   The Company and the Noteholders now desire to amend the Note Agreement
with respect to the matters set forth herein.

     C.   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, the Company and the Noteholders agree as follows:

SECTION 1.   AMENDMENTS.

        1.1  Section 5.16 of the Note Agreement is amended in its entirety to 
read as follows:

             "SECTION 5.16. CAPITALIZATION.  The authorized capital stock of the
        Company consists solely of 20,000,000 shares of $.0001 par common stock,
        of which 5,234,109 shares are issued and outstanding."

        1.2  The following defined terms in Annex A of the Note Agreement are 
amended in their entirety to read as follows:

             "NEW COMPANY NOTE AGREEMENT" means that certain Note Purchase
        Agreement, dated May 28, 1996, among the Company and the Noteholders
        (other than RIMCO Partners, L.P. III), as amended or modified from time
        to time and that certain Note Purchase Agreement, dated March 27, 1997,
        among the Company and the Noteholders, as amended or modified from time
        to time.


<PAGE>
 
             "NEW SENIOR NOTES" means the 10% Senior Secured General Obligation
        Notes, in the maximum aggregate principal amount of $6,500,000 issued by
        the Company under the New Company Note Agreement, dated May 28, 1996 and
        the 12% Senior Secured General Obligation Notes, in the maximum
        aggregate principal amount of $2,000,000 issued by the Company under the
        New Company Note Agreement dated March 27, 1997.

             "SUBSIDIARY NOTE AGREEMENT" means that certain Amended and Restated
        Note Purchase Agreement, dated March 27, 1997, among UNEXCO and the
        Noteholders, as amended or modified from time to time.

             "SUBSIDIARY NOTES" means the Amended and Restated 12% Senior
        Secured General Obligation Notes, in the maximum aggregate principal
        amount of $5,500,000 issued by UNEXCO under the Subsidiary Note
        Agreement.

SECTION 2.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

     2.1     The Company represents and warrants to the Noteholders that:

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

             (b)  The Note Agreement, as amended by this Fourth Amendment,
     constitutes the legal, valid and binding obligation of the Company
     enforceable against it 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 the Company of this
Fourth 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;

                                      -2-

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

          (e)  all representations and warranties contained in Article V of the
     Note 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 the
     Company on and as of the date hereof.

SECTION 3.  CONDITIONS TO EFFECTIVENESS OF THIS FOURTH AMENDMENT.

     3.1  This Fourth 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 Fourth Amendment, duly executed by
     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 the Company authorizing the execution, delivery
     and performance by the Company of this Fourth Amendment, certified by its
     Secretary or an Assistant Secretary;

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

          (d)  the Noteholders shall have received the favorable opinion of
     counsel to 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  The Company agrees 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 
Fourth Amendment.

SECTION 5.  MISCELLANEOUS

     5.1  This Fourth Amendment shall be construed in connection with and as 
part of the Note Agreement, and except as modified and expressly amended by this
Fourth Amendment, all terms, conditions, and covenants contained in the Note 
Agreement, the Notes and the other Transaction Documents 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 Fourth Amendment
may refer to the Note


                                      -3-


<PAGE>
 
Agreement without making specific reference to this Fourth Amendment but 
nevertheless all such references shall include this Fourth Amendment unless the 
context otherwise requires.

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

     5.4  This Fourth 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


                                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





                                      -4-

<PAGE>
 






                   ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

     1.5  SECOND AMENDMENT TO NOTE PURCHASE (5/28/96) DATED MARCH 27, 1997
                         BETWEEN THE COMPANY AND RIMCO


<PAGE>
 
                  SECOND AMENDMENT TO NOTE PURCHASE AGREEMENT
                            AND AMENDMENT OF NOTES

     The Second Amendment to Note Purchase Agreement and Amendment of Notes
(this "Second Amendment") dated as of March 27, 1997 is between UNIVERSAL
SEISMIC ASSOCIATES, INC., a Delaware corporation (the "COMPANY"), and RIMCO
PARTNERS, L.P., a Delaware limited partnership, RIMCO PARTNERS, L.P. II, 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 May 28, 1996 as amended by that certain
First Amendment dated December 20, 1996 (as so amended the "NOTE AGREEMENT").

     B.  The Company and the Noteholders now desire to further amend the Note 
Agreement with respect to the matters set forth herein and to amend the Notes 
issued pursuant to the terms thereof.

     C.  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, the Company and the Noteholders agree as follows:

SECTION 1.   AMENDMENTS TO NOTE AGREEMENT.

        1.1  Section 5.16 of the Note Agreement is amended in its entirety to 
read as follows:

             "SECTION 5.16. CAPITALIZATION.  The authorized capital stock of the
     Company consists solely of 20,000,000 shares of $.0001 par common stock, of
     which 5,234,109 shares are issued and outstanding."

        1.2  The following defined terms in Annex A of the Note Agreement are 
             amended in their entirety to read as follows:

             "EXISTING NOTE AGREEMENTS" means that certain Note Purchase 
     Agreement, date January 19, 1996, among the Company, the Noteholders and
     RIMCO Partners, L.P. III, as amended or modified from time to time and that
     certain Note Purchase Agreement, dated


<PAGE>
 
     May 28, 1996, among the Company and the Noteholders, as amended or modified
     from time to time.

            "EXISTING SENIOR NOTES" means the 10% Senior Secured General
     Obligation Notes, in the maximum aggregate principal amount of $10,000,000
     issued by the Company under the Existing Note Agreements.

            "SUBSIDIARY NOTE AGREEMENT" means that certain Amended and Restated
     Note Purchase Agreement, dated March 27, 1997, among UNEXCO and the
     Noteholders and RIMCO Partners, L.P. III, as amended or modified from time
     to time.

            "SUBSIDIARY NOTES" means the Amended and Restated 12% Senior Secured
     General Obligation Notes, in the maximum aggregate principal amount of
     $5,500,000 issued by UNEXCO under the Subsidiary Note Agreement.

SECTION 2.  AMENDMENTS TO NOTES.

        2.1 The second paragraph of that certain 10% Senior Secured General 
Obligation Note (No. SN-5), dated May 28, 1996, in the principal amount of 
$4,095,000 issued by the Company in favor of RIMCO Partners, L.P. is hereby 
amended in its entirety to read as follows:

            "This Note is due and payable as follows:

            (a)  commencing on July 1, 1996, on the first day of each month
     through and including June 1, 1997, a payment equal to all accrued but
     unpaid interest thereon;

            (b)  commencing on July 1, 1997, on the first day of each month 
     through and including November 1, 1999, a payment equal to $87,006.55;

            (c)  On December 1, 1999, the unpaid principal balance hereof,
    together with all accrued but unpaid interest hereon, shall be fully and
    finally due and payable.

        2.2 The second paragraph of that certain 10% Senior Secured General
Obligation Note (No. SN-6), dated May 28, 1996, in the principal amount of
$741,000 issued by the Company in favor of RIMCO Partners, L.P. II is hereby
amended in its entirety to read as follows:

            "This Note is due and payable as follows:

            (a)  commencing on July 1, 1996, on the first day of each month
    through and including June 1, 1997, a payment equal to all accrued but
    unpaid interest thereon;



                                      -2-


<PAGE>
 
          (b)  commencing on July 1, 1997, on the first day of each month 
     through and including November 1, 1999, a payment equal to $15,744.06;

          (c)  On December 1, 1999, the unpaid principal balance hereof, 
     together with all accrued but unpaid interest hereon, shall be fully and
     finally due and payable.

     2.3  The second paragraph of that certain 10% Senior Secured General 
Obligation Note (No. SN-7), dated May 28, 1996, in the principal amount of 
$1,664,000 issued by the Company in favor of RIMCO Partners, L.P. IV is hereby 
amended in its entirety to read as follows:

          "The Note is due and payable as follows:

          (a)  commencing on July 1, 1996, on the first day of each month
     through and including June 1, 1997, a payment equal to all accrued but
     unpaid interest thereon;

          (b)  commencing on July 1, 1997, on the first day of each month 
     through and including November 1, 1999, a payment equal to $35,355.08;

          (c)  On December 1, 1999, the unpaid principal balance hereof,
     together with all accrued but unpaid interest hereon, shall be fully and
     finally due and payable.

SECTION 3.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     3.1  The Company represents and warrants to the Noteholders that:

          (a)  this Second Amendment has been duly authorized, executed and
     delivered by it and this Second Amendment constitutes the legal, valid and
     binding obligation of the Company enforceable against it 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;

          (b)  The Note Agreement and the Notes, as amended by this Second
     Amendment, constitute the legal, valid and binding obligations of the
     Company enforceable against it in accordance with their respective 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 the Company of this
     Second 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 provisions of law, statute, rule or
     regulation or its certificate of incorporation or bylaws, (2) any order of
     any court or any


                                      -3-


<PAGE>
 
     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 Second 
     Amendment, no Default or Event of Default has occurred which is continuing;
     and

          (e)  all representations and warranties contained in Article V of the
     Note 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 the
     Company on and as of the date hereof.

SECTION 4.  CONDITIONS TO EFFECTIVENESS OF THIS SECOND AMENDMENT.

     4.1  This Second 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 Second Amendment, duly executed by
     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 the Company authorizing the execution, delivery
     and performance by the Company of this Second Amendment, certified by its
     Secretary or an Assistant Secretary;

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

          (d)  the Noteholders shall have received the favorable opinion of
     counsel to the Company as to the matters set forth in SECTION 3.1(a),
     3.1(b) and 3.1(c) hereof, which opinion shall be in form and substance
     satisfactory to the Noteholders.

SECTION 5.  PAYMENT OF NOTEHOLDERS' COUNSEL FEES AND EXPENSES.

     5.1  The Company agrees 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 
Second Amendment.

SECTION 6.  MISCELLANEOUS.

     6.1  This Second Amendment shall be construed in connection with and as 
part of the Note Agreement, and except as expressly amended by this Second 
Amendment, all terms,


                                      -4-

<PAGE>

conditions, and covenants contained in the Note Agreement, the Notes and the 
other Transaction Documents are herby ratified and shall be and remain in full 
force and effect.

     6.2  Any and all notices, request, certificates and other instruments 
executed and delivered after the execution and delivery of this Second 
Amendment may refer to the Note Agreement and the Notes without making specific 
reference to this Second Amendment but nevertheless all such references shall 
include this Second Amendment unless the context otherwise requires.

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

     6.4  This Second Amendment shall be governed by and construed in accordance
with New York law.

                                            UNIVERSAL SEISMIC ASSOCIATES, INC.

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

      
                                            RIMCO PARTNERS, L.P.,
                                            RIMCO PARTNERS, L.P. II, AND
                                            RIMCO PARTNERS, L.P. IV

                                                /s/ GARY MILAVEC
                                            By:________________________________
                                            Name:   Gary Milavec
                                            Title:  Vice President


                                      -5-

<PAGE>
 
                   ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K

           1.6 NOTE PURCHASE AGREEMENT DATED MARCH 27, 1997 BETWEEN
                            THE COMPANY AND RIMCO.


<PAGE>
 
================================================================================


                      UNIVERSAL SEISMIC ASSOCIATES, INC.


                                  $2,000,000
                  12% Senior Secured General Obligation Notes


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

                            NOTE PURCHASE AGREEMENT

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


                          Dated as of March 27, 1997



================================================================================
<PAGE>
 
                            NOTE PURCHASE AGREEMENT

     NOTE PURCHASE AGREEMENT dated as of March 27, 1997 among UNIVERSAL SEISMIC
ASSOCIATES, INC., a Delaware corporation (the "COMPANY"), and RIMCO PARTNERS,
L.P., a Delaware limited partnership, 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").

     In consideration of the mutual covenants herein contained, 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 ANNEX A attached hereto (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 take 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 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 terms. 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.


<PAGE>
 
                                  ARTICLE II
                                 SALE OF NOTES

     SECTION 2.01. NOTES. The Company will authorize the issue and sale of
$2,000,000 aggregate principal amount of its 12% Senior Secured General
Obligation Notes (the "NOTES"). Subject to the terms and conditions of this
Agreement, at the Closing provided for in ARTICLE III, the Company will issue
and sell to the Noteholders, and the Noteholders will purchase from the Company,
Notes in the principal amount specified opposite such Noteholder's name in
SCHEDULE A at the purchase price of 100% of the principal amount thereof. The
Notes shall be substantially in the form set out in EXHIBIT 2.01, with such
changes therefrom, if any, as may be approved by the Noteholders and the
Company.

                                  ARTICLE III
                                    CLOSING

     The sale and purchase of the Notes to be purchased by the Noteholders shall
occur at the offices of Andrews & Kurth, L.L.P., 600 Travis, Houston, Texas
77002, at 10:00 a.m., Houston time, at a closing (the "CLOSING") on March 27,
1997. At the Closing the Company will deliver to each Noteholder the Note to be
purchased by such Noteholder, registered in such Noteholder's name, against
delivery by such Noteholder to or for the account of the Company of immediately
available funds in the amount of the purchase price therefor by wire transfer to
the Company. If at the Closing the Company shall fail to tender such Notes to
the Noteholders as provided above in this ARTICLE III, or any of the conditions
specified in ARTICLE IV shall not have been fulfilled to the Noteholders'
satisfaction, the Noteholders shall, at the Noteholders' election, be relieved
of all further obligations under this Agreement, without thereby waiving any
rights the Noteholders may have by reason of such failure or such
nonfulfillment.

                                  ARTICLE IV
                             CONDITIONS TO CLOSING

     The Noteholders' obligation to purchase and pay for the Notes to be sold to
the Noteholders at the Closing is subject to the fulfillment to the Noteholders'
satisfaction, prior to or at the Closing, of the following conditions:

     SECTION 4.01. EXECUTION OF DOCUMENTS. The Noteholders shall have received
the following agreements (together with this Agreement, collectively, the
"TRANSACTION DOCUMENTS"), in such number of counterparts as the Noteholders may
reasonably request, each dated the date of the Closing and duly executed by the
Persons indicated below:

          (a) the Notes duly executed by the Company;

          (b) the Security Documents duly executed by the Company and Universal 
     Seismic Acquisition, Inc. as appropriate; and


                                      -2-

<PAGE>
 
          (c) amendments to such of the Prior Transaction Documents as the 
     Noteholders shall deem appropriate to permit the purchase and sale of the
     Notes, such amendments to be in a form reasonably satisfactory to the
     Noteholders.

     SECTION 4.02. PERFECTION OF LIENS. The Noteholders shall have received
evidence, in form and substance satisfactory to the Noteholders, that the Liens
contemplated by the Security Documents have been duly perfected in accordance
with applicable law and constitute a first priority Lien on the Collateral,
including (a) acknowledgment copies of UCC financing statements filed with the
Secretaries of State of Texas, Alabama, California, Florida, Louisiana,
Mississippi, New Mexico and Ohio and the Oklahoma County Clerk, (b) a search of
the lien records of the Secretaries of State of Texas, Alabama, California,
Florida, Louisiana, Mississippi, New Mexico and Ohio and the Oklahoma County
Clerk and (c) notation of the Noteholders' Lien on each certificate of title
pertaining to the Collateral.

     SECTION 4.03.  CERTIFICATES. The Company shall have delivered to the 
Noteholders:

          (a) an Officer's Certificate, dated the date of the Closing,
     certifying that the conditions specified in SECTION 4.05 and SECTION 4.06
     have been fulfilled; and

          (b) a certificate certifying as to the resolutions attached thereto 
and other corporate proceedings relating to the authorization, execution and 
delivery of the Notes and the other Transaction Documents.

     SECTION 4.04  OPINION OF COUNSEL. The Noteholders shall have received 
opinions in form and substance satisfactory to the Noteholders, dated the date 
of the Closing from Boyer, Ewing & Harris, Incorporated, counsel for the 
Company, covering the matters set forth in EXHIBIT 4.04 and covering such other 
matters incident to the transactions contemplated hereby as the Noteholders or 
the Noteholders' counsel may reasonably request (and the Company hereby 
instructs its counsel to deliver such opinion to the Noteholders).

     SECTION 4.05  REPRESENTATIONS AND WARRANTIES. The representations and 
warranties of the Company in this Agreement and the other Transaction Documents 
shall be correct when made and at the time of the Closing.

     SECTION 4.06  PERFORMANCE; NO DEFAULT. The Company shall have performed and
complied with all agreements and conditions contained in this Agreement or the 
other Transaction Documents required to be performed or complied with by it 
prior to or at the Closing and after giving effect to the issue and sale of the 
Notes (and the application of the proceeds thereof as contemplated by SECTION 
5.14) no Default or Event of Default shall have occurred and be continuing.


                                      -3-
<PAGE>
 
     SECTION 4.07 PAYMENT OF SPECIAL COUNSEL FEES. Without limiting the
provisions of SECTION 13.01, the Company shall have paid on or before the
Closing the reasonable fees, charges and disbursements of the Noteholders'
special counsel to the extent reflected in a statement of such counsel rendered
to the Company at least one Business Day prior to the Closing.

     SECTION 4.08 PROCEEDINGS AND DOCUMENTS. All corporate and other proceedings
in connection with the transactions contemplated by this Agreement and all
documents and instruments incident to such transactions shall be reasonably
satisfactory to the Noteholders and the Noteholders' special counsel, and the
Noteholders and the Noteholders' special counsel shall have received all such
counterpart originals or certified or other copies of such documents as the
Noteholders or they may reasonably request.

                                   ARTICLE V

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company represents and warrants to the Noteholders that:

     SECTION 5.01. ORGANIZATION; POWER AND AUTHORITY. The Company is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware, and is duly 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. The Company 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 5.02. AUTHORIZATION, ETC. This Agreement and the other Transaction
Documents have been duly authorized by all necessary corporate action on the
part of the Company, and this Agreement constitutes, and upon execution and
delivery thereof each other Transaction Document will constitute, a legal, valid
and binding obligation of the Company enforceable against the Company 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 5.03. COMPLIANCE WITH LAWS, OTHER INSTRUMENTS, ETC. The execution,
delivery and performance by the Company 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 the Company 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 the Company or any
Subsidiary is bound or by which the Company or any Subsidiary or any of their
respective properties may be bound or affected, (b)

                                      -4-
<PAGE>
 
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 the Company or any Subsidiary or (c)
violate any provision of any statute or other rule or regulation of any
Governmental Authority applicable to the Company or any Subsidiary.

     SECTION 5.04. 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 the Company of this Agreement or the other Transaction Documents.

     SECTION 5.05. SUBSIDIARIES. SCHEDULE 5.05 contains complete and correct
lists of the Company'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 the Company 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 the Company or any of its
Subsidiaries that owns outstanding shares of capital stock or similar equity
interests of such Subsidiary.

     SECTION 5.06. FINANCIAL STATEMENTS. The consolidated balance sheet of the
Company and its Subsidiaries as at June 30, 1996, and the related consolidated
statements of income, retained earnings and cash flows for the 12-month period
then ended, copies of which the Company has delivered to each Noteholder, fairly
present in all material respects the consolidated financial position of the
Company 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.

     SECTION 5.07. DISCLOSURE. This Agreement, the documents, certificates or
other writings delivered to the Noteholders by or on behalf of the Company in
connection with the transactions contemplated hereby, the financial statements
referred to in SECTION 5.06 and the Form 10-Qs filed by the Company with the
Securities Exchange Commission since June 30, 1996, 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. Since June 30,
1996, there has been no change in the financial condition, operations, business,
properties or prospects of the Company 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 the Company 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 5.06) delivered to
the Noteholders by or on behalf of the Company specifically for use in
connection with the transactions contemplated hereby.

                                      -5-
<PAGE>
 
     SECTION 5.08. LITIGATION. Except as disclosed in SCHEDULE 5.08, there are
no actions, suits or proceedings pending or, to the knowledge of the Company,
threatened against or affecting the Company or any Subsidiary or any property of
the Company 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 5.09. OBSERVANCE OF AGREEMENTS, STATUTES AND ORDERS. Neither the
Company 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 5.10. TAXES. The Company 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 the Company or a Subsidiary,
as the case may be, has established adequate reserves in accordance with
GAAP. The Company 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 the Company and its Subsidiaries
in respect of Federal, state or other taxes for all fiscal periods are adequate
in all material respects. The Federal income tax liabilities of the Company 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, 1996.

     SECTION 5.11. TITLE TO PROPERTY. The Company 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 5.06 or purported to have
been acquired by the Company 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 5.12. LICENSES, PERMITS, ETC. The Company 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 the Company, (a) no product of the
Company infringes in any material respect any license, permit, franchise,
authorization, patent, copyright, service mark, trademark, trade name or other
right owned by any

                                      -6-
<PAGE>
 

other Person; and (b) there is no Material violation by any Person of any right 
of the Company or any of its Subsidiaries with respect to any patent, copyright,
service mark, trademark, trade name or other right owned or used by the Company 
or any of its Subsidiaries.

    SECTION 5.13. COMPLIANCE WITH ERISA.

    (a) The Company and each ERISA Affiliate have operated and administered each
Plan, if any, 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 the Company nor any ERISA Affiliate
has incurred any liability pursuant to Title I or IV or 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 the Company or any ERISA Affiliate, or in the imposition of any 
Lien on any of the rights, properties or assets of the Company or any ERISA 
Affiliate, in either case pursuant to Title I or IV or 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
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) The Company 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 the Company'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 of 
the Code) of the Company and its Subsidiaries is not Material.


    SECTION 5.14. USE OF PROCEEDS; MARGIN REGULATIONS. The Company will apply 
the proceeds of the sale of the Notes for working capital. No part of the 
proceeds from the sale of the Notes hereunder will be used, directly or 
indirectly, for the purpose of buying or carrying any margin stock within the 
meaning of Regulation G of the Board of Governors of the Federal Reserve System 
(12 CFR 207), or for the purpose of buying or carrying or trading in any 
securities under such circumstances as to involve the Company in a violation of 
Regulation X of said Board (12 CFR 224) or to involve any broker or dealer in a 
violation of Regulation T of said Board (12 CFR 220).



                                      -7-


<PAGE>
 
    SECTION 5.15. STATUS UNDER CERTAIN STATUTES. Neither the Company 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 5.16. CAPITALIZATION. The authorized capital stock of the Company 
consists solely of 20,000,000 shares of $.0001 par common stock, of which 
5,234,109 shares are issued and outstanding.

    SECTION 5.17. SECURITIES MATTERS. Other than offers to Accredited Investors,
neither the Company nor anyone acting on its behalf has directly or indirectly 
offered the Notes or any part thereof or any similar securities for sale to, or 
solicited any offer to buy any of the same from, or otherwise approached or 
negotiated in respect thereof with, anyone other than the Noteholders named in 
SCHEDULE A. Neither the Company nor anyone acting on its behalf has taken or 
will take any action which would subject the issuance and sale of the Notes to 
the registration and prospectus delivery provisions of the Securities Act.

    SECTION 5.18. ENVIRONMENTAL MATTERS. Neither the Company 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 the Company 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 the 
Company 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 the Company 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 the Company 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.

                                  ARTICLE VI
                       REPRESENTATIONS OF THE PURCHASER

    SECTION 6.01. PURCHASE OF INVESTMENT. Each Noteholder represents that it is 
acquiring its Notes for its own account or for one of its separate accounts (or 
for the account of trusts for which it is trustee) for investment with no 
intention of presently distributing or reselling the same, subject, 
nevertheless, to its right to dispose of, in compliance with applicable 
securities laws,

                                      -8-


<PAGE>
 
its respective Notes, or any part of any thereof held by it, if at some future 
time in its sole discretion it deems it advisable so to do.  Each Noteholder 
hereby agrees that it will not sell, transfer or otherwise dispose of its Notes 
in violation of the Securities Act.

     SECTION 6.02.  STATUS; NO REGISTRATION.  Each Noteholder represents that it
is an Accredited Investor.  Each Noteholder acknowledges that the Notes have not
been registered under the Securities Act, and that such Notes must be held 
indefinitely unless they are subsequently registered under the Securities Act or
an exemption from such registration is available.

                                  ARTICLE VII
                             PAYMENT OF THE NOTES

     SECTION 7.01.  PLACE OF PAYMENT.  The Company will pay all sums becoming 
due to any Noteholder under any Transaction Document by the method and at the 
address specified for such purpose below such Noteholder's name in SCHEDULE A, 
or by such other method or at such other address as such Noteholder shall have 
from time to time specified to the Company in writing for such purpose, without 
the presentation or surrender of such Note or the making of any notation 
thereon, except that upon written request of the Company made concurrently with 
or reasonably promptly after payment or prepayment in full of any Note, the 
Noteholders shall surrender such Note for cancellation, reasonably promptly 
after any such request, to the Company at its principal executive office.

     SECTION 7.02.  PAYMENTS DUE ON NON-BUSINESS DAYS.  Anything in this 
Agreement or the Notes to the contrary notwithstanding, any payment of principal
of or interest on any note that is due on a date other than a Business Day shall
be made on the next succeeding Business Day without including the additional
days elapsed in the computation of the interest payable on such next succeeding
Business Day.

     SECTION 7.03.  OPTIONAL PREPAYMENTS OF NOTES.  (a) The Company may, at its 
option, without notice, penalty, premium or fee, prepay at any time all, or from
time to time any part of, the Notes, in an amount not less than $75,000 in the 
case of a partial prepayment, at 100% of the principal amount so prepaid, plus 
accrued interest on such principal amount.

     (b)  In the case of each partial prepayment of the Notes, the principal 
amount of the Notes to be prepaid shall be allocated among all of the Notes at 
the time outstanding in proportion, as nearly as practicable, to the respective 
unpaid principal amounts thereof not theretofore called for prepayment.

     (c)  Any Note paid or prepaid in full shall be surrendered to the Company 
and canceled and shall not be reissued, and no Note shall be issued in lieu of 
any prepaid principal amount of any Note.


                                      -9-
<PAGE>
 
     SECTION 7.04. PURCHASE OF NOTES. The Company will not, and will not permit
any Affiliate to, purchase, redeem, prepay or otherwise acquire, directly or
indirectly, any of the outstanding Notes except upon the payment or prepayment
of the Notes in accordance with the terms of this Agreement and the Notes. The
Company will promptly cancel all Notes acquired by it or any Affiliate pursuant
to any payment, prepayment or purchase of Notes pursuant to any provision of
this Agreement and no Notes may be issued in substitution or exchange for any
such Notes.

                                  ARTICLE VIII
                           INFORMATION AS TO COMPANY

     SECTION 8.01. FINANCIAL AND BUSINESS INFORMATION. The Company shall deliver
to each of the Noteholders:

     (a) Within 45 days after the end of each quarterly fiscal period in each
fiscal year of the Company, copies of (i) a consolidated balance sheet of the
Company and its Subsidiaries as at the end of such quarter, and (ii)
consolidated statements of income, changes in shareholders' equity and cash
flows of the Company 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 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 the Company, copies
of (i) a consolidated balance sheet of the Company and its Subsidiaries, as at
the end of such year, and (ii) consolidated statements of income, changes in
shareholders' equity and cash flows of the Company 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 the Company and its Subsidiaries as at the end of
such month, and

                                     -10-
<PAGE>
 
(ii) consolidated statements of income, changes in shareholders' equity and cash
flows of the Company 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 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.

     (d) Within 60 days after the end of each calendar year, an appraisal
report, prepared by an independent appraisal firm reasonably acceptable to the
Noteholders, covering the Collateral and calculating the Collateral Liquidation
Value as of the end of such calendar year, all in form and substance
satisfactory to the Noteholders.

     (e) Promptly upon their becoming available, one copy of (i) each financial
statement, report, notice or proxy statement sent by the Company 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 the Company or any Subsidiary with the Securities and Exchange
Commission and of all press releases and other statements made available
generally by the Company or any Subsidiary to the public concerning developments
that are Material.

     (f) Promptly, and in any event within five days after a Responsible Officer
becoming aware of the existence of any Default or Event of Default or that any
Person has given any notice or taken any action with respect to a claimed
default hereunder or that any Person has given any notice or taken any action
with respect to a claimed default of the type referred to in SECTION 11.01, a
written notice specifying the nature and period of existence thereof and what
action the Company is taking or proposes to take with respect thereto;

     (g) Promptly, and in any event within five days after a Responsible Officer
becoming aware of any of the following, a written notice setting forth the
nature thereof and the action, if any, that the Company 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 the Company
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 the Company 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 the Company or any ERISA Affiliate pursuant to Title I or IV of
ERISA or such penalty or excise tax provisions, if such liability

                                     -11-
<PAGE>
 
or Lien, taken together with any other such liabilities or Liens then existing,
could reasonably be expected to be Material.

     (h) Promptly, and in any event within 30 days of receipt thereof, copies of
any notice to the Company 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

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

     SECTION 8.02. OFFICER'S CERTIFICATE. Each set of financial statements
delivered to a holder of Notes pursuant to SECTION 8.01(A), SECTION 8.01(B) OR
SECTION 8.01(C) shall be accompanied by a certificate of a Senior Financial
Officer setting forth: (a) the information (including detailed calculations)
required in order to establish whether the Company was in compliance with the
requirements of SECTION 10.03 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 has made, or caused to be made, under his or her supervision, a
review of the transactions and conditions of the Company 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 the Company or any
Subsidiary to comply with any Environmental Law), specifying the nature and
period of existence thereof and what action the Company shall have taken or
proposes to take with respect thereto.

     SECTION 8.03. INSPECTION. The Company shall permit the representatives of
each Noteholder, at the expense of the Company and upon reasonable prior notice
to the Company, to visit and inspect any of the offices or properties of the
Company 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 the Company
authorizes said accountants to discuss the affairs, finances and accounts of the
Company and its Subsidiaries), all at such times and as often as may be
requested.

                                     -12-
<PAGE>
 
                                   ARTICLE IX
                             AFFIRMATIVE COVENANTS

     The Company covenants that so long as any of the Notes are outstanding:

     SECTION 9.01. COMPLIANCE WITH LAW; CONTRACTS. The Company 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 noncompliance 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. The Company 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 the
Company, the failure to so comply or perform could not reasonably be expected to
have a Material Adverse Effect.

     SECTION 9.02. INSURANCE. The Company 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 engaged in the same or a similar business
and similarly situated, including the insurance described in SCHEDULE 9.02.

     SECTION 9.03. MAINTENANCE OF PROPERTIES. The Company 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 the Company 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 the Company has concluded that such
discontinuance could not, individually or in the aggregate, reasonably be
expected to have a Material Adverse Effect.

     SECTION 9.04. PAYMENT OF TAXES AND CLAIMS. The Company 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 the Company or any
Subsidiary, provided that neither

                                     -13-
<PAGE>
 
the Company nor any Subsidiary need pay any such tax or assessment or claims if
(i) the amount, applicability or validity thereof is contested by the Company or
such Subsidiary on a timely basis in good faith and in appropriate proceedings,
and the Company or a Subsidiary has established adequate reserves therefor in
accordance with GAAP on the books of the Company 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 9.05. CORPORATE EXISTENCE, ETC. The Company will at all times
preserve and keep in full force and effect its corporate existence. The Company
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 the
Company and its Subsidiaries unless, in the good faith judgment of the Company,
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.

                                   ARTICLE X
                               NEGATIVE COVENANTS

     The Company covenants that so long as any of the Notes are outstanding:

     SECTION 10.01. RESTRICTIONS ON INDEBTEDNESS. The Company 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 Existing Senior Notes;

            (c)  the Subsidiary Notes; and

            (d) Indebtedness outstanding under the Fidelity Funding Agreement.

     SECTION 10.02. RESTRICTIONS ON LIENS. The Company 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 permitted under the Existing
   Transaction Documents;

                                     -14-
<PAGE>
 
     (c)  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, the Company;

     (d)  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 9.04;

     (e)  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;

     (f)  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

     (g)  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 10.03.  FINANCIAL COVENANTS.  The Company will not permit:

     (a)  its Current Assets at any time 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;

     (b)  its Tangible Net Worth at any time to be less than $7,000,000;

     (c)  the sum, determined as of the last day of each calendar month 
beginning March 1997, or (i) its Net Income for the twelve month period then 
ended, plus (i) 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 (v) any Federal income taxes deducted in the calculation of Net Income for 
such twelve month period, to be less than $2,500,000; and

     (d)  the ratio of (i) the Collateral Liquidation Value to (ii) the 
aggregate outstanding principal balance of the Notes and the Existing Senior 
Notes, to be less than 1.5 to 1.0 at any time.

     SECTION 10.04.  REESTRICTED PAYMENTS.  Except as contemplated by the 
Transaction Documents and the Existing Transaction Documents, the Company 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 Company's capital
stock (including any dividends payable in shares of capital stock), (b) any

                                     -15-
<PAGE>
 
payment on account of the purchase, redemption, retirement or acquisition of any
shares of the Company'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 10.05.  MERGER, CONSOLIDATED, ETC.  The Company 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 10.06.  RESTRICTIONS ON ASSET SALES.  Without the Noteholders' 
prior written consent, the Company 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, except sales of assets during each 
calendar year that have an aggregate Collateral Liquidation Value of $150,000 or
less.

     SECTION 10.07.  TRANSACTIONS WITH AFFILIATES.  The Company 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 the Company
or another Subsidiary), except in the ordinary course and pursuant to the 
reasonable requirements of the Company's or such Subsidiary's business and upon 
fair and reasonable terms no less favorable to the Company or such Subsidiary 
than would be obtainable in a comparable arm's-length transaction with a Person 
not an Affiliate.

     SECTION 10.08.  CHANGE IN BUSINESS.  Except for oil and gas exploration and
production operations to be conducted by UNEXCO, the Company 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, the Company and its Subsidiaries 
(other than UNEXCO) shall not engage in any oil and gas exploration and 
production operations or business.

     SECTION 10.09.  FIDELITY FUNDING AGREEMENT.  Without the prior written 
consent of the Noteholders, the Company will not, and will not permit any of its
Subsidiaries to amend, modify or extend the Fidelity Funding Agreement.

     SECTION 10.10.  RESTRICTION ON INVESTMENT.  Other than (a) the common stock
of UNEXCO owned by the Company on the date thereof, (b) Oil and Gas Properties 
transferred to UNEXCO prior to the date hereof and (c) capital contributions to 
UNEXCO that are applied directly to pay the Indebtedness owing on the Subsidiary
Notes, the Company will not, and will not permit any of its Subsidiaries to,
make any Investment in UNEXCO without the Noteholders' prior written consent.

                                     -16-
<PAGE>
 
                                  ARTICLE XI
                             DEFAULT AND REMEDIES

          SECTION 11.01.  EVENTS OF DEFAULT.  An "EVENT OF DEFAULT" shall exist
if any of the following conditions or events shall occur and be continuing:

          (a)  the Company defaults in the payment of any principal or interest
     on any Note when the same becomes due and payable, whether at maturity, by
     declaration or otherwise; or

          (b)  the Company defaults in the performance of or compliance with any
     term contained in ARTICLE X; or 

          (c)  the Company defaults in the performance of or compliance with any
     term contained herein (other than those referred to in paragraphs (a) and
     (b) of this SECTION 11.01) and such default is not remedied within 30 days
     after the earlier of (i) a Responsible Officer obtains actual knowledge of
     such default or (ii) the Company receives written notice of such default
     from any holder of a Note; or

          (d)  any representation or warranty made in writing by or on behalf of
     the Company or by any officer of the Company in this Agreement or in any
     writing furnished in connection with the transactions contemplated hereby
     proves to have been false or incorrect in any Material respect on the date
     as of which made; or

          (e)  (i) the Company or any Subsidiary is in default (as principal or
     as guarantor or other surety) in the payment of any principal of or premium
     or interest on any Indebtedness that is outstanding in an aggregate
     principal amount of at least $100,000 beyond any period of grace provided
     with respect thereto, or (ii) the Company or any Subsidiary is in default
     in the performance of or compliance with any term of any evidence of any
     Indebtedness in an aggregate outstanding principal amount of at least
     $100,000 or of any mortgage, indenture or other agreement relating thereto
     or any other condition exists, and as a consequence of such default or
     condition such Indebtedness has become, or has been declared (or one or
     more Persons are entitled to declare such Indebtedness to be), due and
     payable before its stated maturity or before its regularly scheduled dates
     of payment, or (iii) as a consequence of the occurrence or continuation of
     any event or condition (other than the passage of time or the right of the
     holder of Indebtedness to convert such Indebtedness into equity interests),
     (x) the Company or any Subsidiary has become obligated to purchase or repay
     Indebtedness before its regular maturity or before its regularly scheduled
     dates of payment in an aggregate outstanding principal amount of at least
     $100,000, or (y) one or more Persons have the right to require the Company
     or any Subsidiary to purchase or repay such Indebtedness; or


                                     -17-

<PAGE>
 
     (f) the Company or any Subsidiary (i) is generally not paying, or admits in
   writing its inability to pay, its debts as they become due, (ii) files, or
   consents by answer or otherwise to the filing against it of, a petition for
   relief or reorganization or arrangement or any other petition in bankruptcy,
   for liquidation or to take advantage of any bankruptcy, insolvency,
   reorganization, moratorium or other similar law of any jurisdiction, (iii)
   makes an assignment for the benefit of its creditors, (iv) consents to the
   appointment of a custodian, receiver, trustee or other officer with similar
   powers with respect to it or with respect to any substantial part of its
   property, (v) is adjudicated as insolvent or to be liquidated, or (vi) takes
   corporate action for the purpose of any of the foregoing; or

      (g) a court or governmental authority of competent jurisdiction enters an
   order appointing, without consent by the Company or any of its Subsidiaries,
   a custodian, receiver, trustee or other officer with similar powers with
   respect to it or with respect to any substantial part of its property, or
   constituting an order for relief or approving a petition for relief or
   reorganization or any other petition in bankruptcy or for liquidation or to
   take advantage of any bankruptcy or insolvency law of any jurisdiction, or
   ordering the dissolution, winding-up or liquidation of the Company or any of
   its Subsidiaries, or any such petition shall be filed against the Company or
   any of its Subsidiaries and such petition shall not be dismissed within 60
   days; or

      (h) a final judgment or judgments for the payment of money aggregating in
   excess of $250,000 are rendered against one or more of the Company and its
   Subsidiaries and such judgments are not, within 60 days after entry thereof,
   bonded, discharged or stayed pending appeal, or are not discharged within 60
   days after the expiration of such stay; or

      (i) an "EVENT OF DEFAULT" exists under the Existing Company Note
   Agreements or the Subsidiary Note Agreement; or

      (j) the Company fails to own (both beneficially and of record) 100% of the
   common stock and other equity securities of UNEXCO; or

      (k) if (i) any Plan shall fail to satisfy the minimum funding standards of
   ERISA or the Code for any plan year or part thereof or a waiver of such
   standards or extension of any amortization period is sought or granted under
   section 412 of the Code, (ii) a notice of intent to terminate any Plan shall
   have been or is reasonably expected to be filed with the PBGC or the PBGC
   shall have instituted proceedings under ERISA section 4042 to terminate or
   appoint a trustee to administer any Plan or the PBGC shall have notified the
   Company or any ERISA Affiliate that a Plan may become a subject to any such
   proceedings (iii) the aggregate "amount of unfunded benefit liabilities"
   (within the meaning of section 4001(a)(18) of ERISA) under all Plans,
   determined in accordance with Title IV of ERISA, shall exceed $25,000, (iv)
   the Company or any ERISA Affiliate shall have incurred or is reasonably
   expected to incur 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, (v) the Company or

                                     -18-
<PAGE>
 
  any ERISA Affiliate withdraws from any Multiemployer Plan, (vi) the Company or
  any ERISA Affiliate fails to make any contribution due, or payment to, any
  employee benefit plan, or (vii) the Company or any Subsidiary establishes or
  amends any employee welfare benefit plan that provides post-employment welfare
  benefits in a manner that would increase the liability of the Company or any
  Subsidiary thereunder, and any such event or events described in clauses (i)
  through (vii) above, either individually or together with any other such event
  or events, could reasonably be expected to have a Material Adverse Effect.

As used in this Section 11.01(j), the terms "EMPLOYEE BENEFIT PLAN" AND
"EMPLOYEE WELFARE BENEFIT PLAN" shall have the respective meanings assigned to
such terms in Section 3 of ERISA.

     SECTION 11.02. ACCELERATION.

     (a) If an Event of Default with respect to the Company described in
paragraph (f) or (g) of SECTION 11.01 (other than an Event of Default described
in clause (i) of paragraph (f) or described in clause (vi) of paragraph (f) by
virtue of the fact that such clause encompasses clause (i) of paragraph (f)) has
occurred, all the Notes then outstanding shall automatically become immediately
due and payable.

     (b) If any other Event of Default has occurred and is continuing, the
Required Holders at any time at its or their option, by notice or notices to the
Company, declare all the Notes then outstanding to be immediately due and
payable.

     (c) If any Event of Default described in paragraph (a) of SECTION 11.01 has
occurred and is continuing, any holder or holders of Notes at the time
outstanding affected by such Event of Default may at any time, at its or their
option, by notice or notices to the Company, declare all the Notes held by it or
them to be immediately due and payable.

     Upon any Notes becoming due and payable under this SECTION 11.02, whether
automatically or by declaration, such Notes will forthwith mature and the entire
unpaid principal amount of such Notes, plus all accrued and unpaid interest
thereon, shall all be immediately due and payable, in each and every case
without presentment, demand, notice of default, notice of intent to accelerate,
notice of acceleration, protest or further notice, all of which are hereby
waived.

     SECTION 11.03. OTHER REMEDIES. If any Default or Event of Default has
occurred and is continuing, and irrespective of whether any Notes have become or
have been declared immediately due and payable under SECTION 11.02, the holder
of any Note at the time outstanding may proceed to protect and enforce the
rights of such holder by an action at law, suit in equity or other appropriate
proceeding, whether for the specific performance of any agreement contained
herein or in any Note, or for an injunction against a violation of any of the
terms hereof or thereof, or in aid of the exercise of any power granted hereby
or thereby or by law or otherwise.


                                     -19-
<PAGE>
 
     SECTION 11.04. NO WAIVERS OR ELECTION OF REMEDIES, EXPENSES, ETC. No course
of dealing and no delay on the part of any holder of any Note in exercising any
right, power or remedy shall operate as a waiver thereof or otherwise prejudice
such holder's rights, powers or remedies. No right, power or remedy conferred by
this Agreement or by any Note upon any holder thereof shall be exclusive of any
other right, power or remedy referred to herein or therein or now or hereafter
available at law, in equity, by statute or otherwise. Without limiting the
obligations of the Company under SECTION 13.01, the Company will pay to the
holder of each Note on demand such further amount as shall be sufficient to
cover all reasonable costs and expenses of such holder incurred in any
enforcement or collection under this ARTICLE XI, including, without limitation,
reasonable attorneys' fees, expenses and disbursements, together with interest
on such amounts at the Default Rate accruing from the date of demand.

                                  ARTICLE XII
                 REGISTRATION; EXCHANGE; SUBSTITUTION OF NOTES

     SECTION 12.01. REGISTRATION OF NOTES. The Company shall keep at its
principal executive office a register for the registration and registration of
transfers of Notes. The name and address of each holder of one or more Notes,
each transfer thereof and the name and address of each transferee of one or more
Notes shall be registered in such register. Prior to due presentment for
registration of transfer, the Person in whose name any Note shall be registered
shall be deemed and treated as the owner and holder thereof for all purposes
hereof, and the Company shall not be affected by any notice or knowledge to the
contrary. The Company shall give to any holder of a Note promptly upon request
therefor, a complete and correct copy of the names and addresses of all
registered holders of Notes.

     SECTION 12.02. TRANSFER AND EXCHANGE OF NOTES. Subject to compliance with
all applicable securities laws, upon surrender of any Note at the principal
executive office of the Company for registration of transfer or exchange (and in
the case of a surrender for registration of transfer, duly endorsed or
accompanied by a written instrument of transfer duly executed by the registered
holder of such Note or his attorney duly authorized in writing and accompanied
by the address for notices of each transferee of such Note or part thereof), the
Company shall execute and deliver, at the Company's expense, one or more new
Notes (as requested by the holder thereof) in exchange therefor, in an aggregate
principal amount equal to the unpaid principal amount of the surrendered Note.
Each such new Note shall be payable to such Person as such holder may request
and shall be substantially in the form specified herein. Each such new Note
shall be dated and bear interest from the date to which interest shall have been
paid on the surrendered Note or dated the date of the surrendered Note if no
interest shall have been paid thereon.

     SECTION 12.03. REPLACEMENT OF NOTES. Upon receipt by the Company of
evidence reasonably satisfactory to it of the ownership of and the loss, theft,
destruction or mutilation of any Note, and (a) in the case of loss, theft or
destruction, of indemnity reasonably satisfactory to it (provided that if the
holder of such Note is, or is a nominee for, an original Noteholder, such
Person's own unsecured agreement of indemnity shall be deemed to be
satisfactory), or (b) in the

                                     -20-
<PAGE>
 
case of mutilation, upon surrender and cancellation thereof, the Company at its
own expense shall execute and deliver, in lieu thereof, a new Note, dated and
bearing interest from the date to which interest shall have been paid on such
lost, stolen, destroyed or mutilated Note or dated the date of such lost,
stolen, destroyed or mutilated Note if no interest shall have been paid thereon.

                                  ARTICLE XIII
                                 MISCELLANEOUS

     SECTION 13.01. TRANSACTION EXPENSES. Whether or not the transactions
contemplated hereby are consummated, the Company 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, 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 the Company or any Subsidiary or in connection with any work-
out or restructuring of the transactions contemplated hereby and by the Notes.
The Company 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 the Company under this SECTION 13.01 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 13.02. 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 the Company
pursuant to this Agreement shall be deemed representations and warranties of the
Company under this Agreement.

                                     -21-
<PAGE>
 
     SECTION 13.03. AMENDMENT AND WAIVER. This Agreement and the Notes may be
amended, and the observance of any term hereof or of the Notes may be waived
(either retroactively or prospectively), with (and only with) the written
consent of the Company and the Required Holders, except that (a) no amendment or
waiver of any of the provisions of ARTICLES II, III, IV or V, or any defined
term (as it is used therein), will be effective as to the Noteholders unless
consented to by all of the Noteholders in writing, and (b) no such amendment or
waiver may, without the written consent of the holder of each Note at the time
outstanding affected thereby, (i) subject to the provisions of ARTICLE XI
relating to acceleration or rescission, change the amount or time of any
prepayment or payment of principal of, or reduce the rate or change the time of
payment or method of computation of interest on, the Notes, or (ii) change the
percentage of the principal amount of the Notes the holders of which are
required to consent to any such amendment or waiver. Any amendment or waiver
consented to as provided in this SECTION 13.03 applies equally to all holders of
Notes and is binding upon them and upon each future holder of any Note and upon
the Company 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, agreement, Default or Event of Default not expressly
amended or waived or impair any right consequent thereon. No course of dealing
between the Company 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 13.04. NOTICES. All notices and communications provide 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
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, or
at such other address as it shall have specified to the Company in writing, (ii)
if to the Company, to the Company at 16420 Park Ten Place, Suite 300, Houston,
Texas 77084, Telecopy No.: 713-578-7091, or at such other address as the Company
shall have specified to the holder of each Note in writing. Notices under this
SECTION 13.04 will be deemed given only when actually received.

     SECTION 13.05. 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 the Company
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.
Notwithstanding the provisions of SECTION 13.14, to the extent that the Highest
Lawful Rate applicable to a Noteholder is at any time


                                     -22-
<PAGE>
 
determined by Texas law, such rate shall be the "indicated rate ceiling" 
described in Section (a)(1) of Article 1.04 of Charter 1, Title 79, of the 
Revised Civil Statutes of Texas, 1925, as amended; provided, however, to the 
extent permitted by such Article, the Noteholders from time to time by notice to
Company may revise the aforesaid election of such interest rate ceiling as such 
ceiling affects the then-current or future balances of the loans outstanding 
under the Notes. Notwithstanding any provision in this Agreement or any other 
Transaction Document to the contrary, if the maturity of the Notes or the 
obligations in respect of the other Transaction Documents are accelerated for 
any reason, or in the event of prepayment of all or any portion of the Notes or 
the obligations in respect of the other Transaction Documents by the Company or 
in any other event, earned interest on the Notes and such other obligations of 
the  Company may never exceed the maximum amount permitted by applicable law, 
and any unearned interest otherwise payable under the Notes or the obligations 
in respect of the other Transaction Documents that is in excess of the maximum 
amount permitted by applicable law shall be canceled automatically as of the 
date of such acceleration or prepayment or other such event and, if theretofore 
paid, shall be credited on the principal of the Notes or, if the principal of 
the Notes has been paid in full, refunded to the Company. In determining 
whether or not the interest paid or payable, under any specific contingency, 
exceeds the Highest Lawful Rate, the Company and the Noteholders shall, to the 
maximum extent permitted by applicable law, amortize, prorate, allocate and 
spread, in equal parts during the period of the actual term of this Agreement, 
all interest at any time contracted for, charged, received or reserved in 
connection with the Transaction Documents.

    SECTION 13.06. INDEMNIFICATION. The Company agrees to indemnify, defend and 
hold each Noteholder, their partners and their respective officers, employees, 
agents, directors, partners, affiliates and shareholders (collectively, 
"INDEMNIFIED PERSONS") harmless from and against any and all loss, liability, 
damage, judgment, claim, deficiency or reasonable expense (including interest, 
penalties, reasonable attorneys' fees and amounts paid in settlement) incurred 
by or asserted against any Indemnified Person arising out of, in any way 
connected with, or as a result of (a) the execution and delivery of this 
Agreement and the other documents contemplated hereby, the performance by the 
parties hereto and thereto of their respective obligations hereunder and 
thereunder and consummation of the transactions contemplated hereby and thereby,
(b) the actual or proposed use of the proceeds of the loans contemplated hereby,
(c) any violation by the Company or any of its Subsidiaries of any requirement
of law, including but not limited to Environmental Laws, (d) any Noteholder
being deemed an operator of any real or personal property of the Company in
circumstances in which no Noteholder is generally operating or generally
exercising control over such property, to the extent such losses, liabilities,
damages, judgments, claims, deficiencies or expenses arise out of or result from
any Hazardous Materials located in, on or under such property or (e) any claim,
litigation, investigation or proceeding relating to any of the foregoing,
whether or not any Indemnified Person is a party thereto; provided that such
indemnity shall not apply to any such losses, claims, damages, liabilities or
related expenses that result from the gross negligence or willful misconduct of,
or willful violation of the Transaction Documents by, such Indemnified Person.
WITHOUT LIMITING ANY PROVISION OF THIS AGREEMENT OR ANY OF THE OTHER TRANSACTION
DOCUMENTS, IT IS THE EXPRESS INTENTION OF THE PARTIES THAT EACH INDEMNIFIED
PERSON SHALL BE

                                     -23-
<PAGE>
 
INDEMNIFIED AND HELD HARMLESS AGAINST ANY AND ALL LOSSES, LIABILITIES, CLAIMS,
DEFICIENCIES, JUDGMENTS AND REASONABLE EXPENSES ARISING OUT OF OR RESULTING FROM
THE ORDINARY NEGLIGENCE (WHETHER SOLE OR CONTRIBUTORY) OF SUCH INDEMNIFIED
PERSON. Each Indemnified Person will attempt to consult with the Company prior
to entering into any settlement of any lawsuit or proceeding that could give
rise to a claim for indemnity under this SECTION 13.06, although nothing herein
shall give the Company the right to direct, or control any such settlement
negotiations or any related lawsuit or proceeding on behalf of such Indemnified
Party. The obligations of the Company under this SECTION 13.06 shall survive the
termination of this Agreement and repayment of the Notes.

     SECTION 13.07. 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 13.08. 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 13.09. 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 13.10. CONFIDENTIALITY. In connection with the negotiation and
administration of this Agreement and the other Transaction Documents, the
Company has furnished and will from time to time furnish the Noteholders certain
written information (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
Confidential Information in accordance with such procedures as the Noteholders
apply generally to information of that nature. Subject to the prohibitions and
restrictions imposed on the Noteholders with respect to the Confidential
Information under applicable securities laws, it is understood that the
foregoing will not restrict the Noteholders' ability to exchange such
Confidential Information with their current or prospective investors, assignees
of the Notes and advisors. 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

                                     -24-
<PAGE>
 
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 the Company as promptly as practicable.

     SECTION 13.11.  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 13.12.  JURY WAIVER.  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 13.13.  CHOICE OF FORUM.  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 13.14. GOVERNING LAW.  This Agreement and the Notes 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, 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
                
                                  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

                                     -26-
<PAGE>
 
                                   SCHEDULE A

                      INFORMATION RELATING TO NOTEHOLDERS

                                                     Principal Amount of
 Name and Address of Noteholder                     Notes to be Purchased
 ------------------------------                     ---------------------
 RIMCO PARTNERS, L.P.                                    $  712,000
 RIMCO PARTNERS, L.P. II                                 $  576,000
 RIMCO PARTNERS, L.P. III                                $  112,000
 RIMCO PARTNERS, L.P. IV                                 $  600.000
                                                         ----------
                                                         $2,000,000
                                                         ----------


 (1)  All payments by wire transfer 
      of immediately available
      funds to:

           Fleet Bank, N.Y.
           ABA No. 021404465
           Account Name: Universal Seismic Associates, Inc.
                         Automatic Clearing Account
           Account No. 9390641743

           with sufficient information to identify the source and application 
           of such funds.

  (2) All notices of payments and
           written confirmations of such
           wire transfers:

           Resource Investors Management Company
           22 Waterville Road
           Avon, Connecticut 06001
           Attn: Doug Skelley
           Telecopy No.: 860-678-9382

                               Schedule A Page 1
<PAGE>
 
  (3)  All other communications:

           Resource Investors Management Company
           Suite 6875
           600 Travis Street
           Houston, Texas 77002
           Attn: Gary Milavec
           Telecopy No.: 713-247-0730
           
              with a copy to
           
           Resource Investors Management Company
           22 Waterville Road
           Avon, Connecticut 06001
           Attn: David R. Whitney
           Telecopy No.: 860-678-9382

                               Schedule A Page 2
<PAGE>
 
                                 SCHEDULE 5.05

                             Company Subsidiaries
                             --------------------
 


                                 Schedule 5.05
<PAGE>
 
                                 SCHEDULE 5.08

                                  Litigation
                                  ----------



                                 Schedule 5.08
<PAGE>
 
                                 SCHEDULE 9.02

                                   Insurance
                                   ---------


                                 Schedule 9.02
<PAGE>
 
                                    ANNEX A
                                 DEFINED TERMS

     "ACCREDITED INVESTOR" means an "accredited investor" as such term is
defined in Regulation D, Rule 501, promulgated by the Securities and Exchange
Commission.

     "AFFILIATE" means, at any time, and with respect to any Person, (a) any
other Person that at such time directly or indirectly through one or more
intermediaries Controls, or is Controlled by, or is under common Control with,
such first Person, and (b) any Person beneficially owning or holding, directly
or indirectly, 10% or more of any class of voting or equity interests of the
Company or any Subsidiary or any corporation of which the Company and its
Subsidiaries beneficially own or hold, in the aggregate, directly or indirectly,
10% or more of any class of voting or equity interests. As used in this
definition, "CONTROL" means the possession, directly or indirectly, of the power
to direct or cause the direction of the management and policies of a Person,
whether through the ownership of voting securities, by contract or otherwise.
Unless the context otherwise clearly requires, any reference to an "Affiliate"
is a reference to an Affiliate of the Company.

     "AGREEMENT" means this Note Purchase Agreement, as amended or modified from
time to time.

     "BUSINESS DAY" means any day other than a Saturday, a Sunday or a day on
which commercial banks in Houston, Texas or New York, New York are required or
authorized to be closed.

     "CAPITAL LEASE" means, at any time, a lease with respect to which the
lessee is required concurrently to recognize the acquisition of an asset and the
incurrence of a liability in accordance with GAAP.

     "CHANGE OF CONTROL" means any of (a) the acquisition by any Person or two
or more Persons (excluding underwriters in the course of their distribution of
voting stock in an underwritten public offering) acting in concert, of
beneficial ownership (within the meaning of Rule 13d-3 promulgated under the
Security Exchange Act of 1934, as amended) of 35% or more of the outstanding
shares of voting stock of the Company, (b) 50% or more of the members of the
Board of Directors of the Company on any date shall not have been (i) members of
the Board of Directors of the Company on the date 12 months prior to such date
or (ii) approved (by recommendation, nomination, election or otherwise) by
Persons who constitute at least a majority of the members of the Board of
Directors of the Company as constituted on the date 12 months prior to such
date, (c) all or substantially all of the assets of the Company are sold in a
single transaction or series or related transactions to any Person, or (d) the
Company merges with or consolidates with any other Person.

    "CLOSING" is defined in ARTICLE III.
<PAGE>
 
       "CODE" means the Internal Revenue Code of 1986, as amended from time to
 time, and the rules and regulations promulgated thereunder from time to time.

       "COLLATERAL" means the equipment and other property described as
 collateral under the Security Documents.

       "COLLATERAL LIQUIDATION VALUE" means, at any time, while the Existing
 Senior Notes or the Notes are outstanding, the value that would be received for
 the Collateral in a sale of the Collateral by a seller who is compelled to sell
 the Collateral on an "as is," "where is" basis with only a limited time to find
 a purchaser, such value to be determined in a manner consistent with the most
 recent appraisal report delivered to the Noteholders under SECTION 8.01(D), as
 adjusted from time to time by the Noteholders, in their sole discretion, for
 any Collateral that is lost, damaged, destroyed or disposed of by the Company.

       "COMPANY" is defined in the introduction to this Agreement.

       "CURRENT ASSETS" means, as of any date, all assets of the Company and its
 Subsidiaries that would be reflected as current assets on a consolidated
 balance sheet of the Company and its Subsidiaries prepared on such date in
 accordance with GAAP consistently applied.

     "CURRENT LIABILITIES" means, as of any date, all liabilities of the Company
and its Subsidiaries that would be reflected as current liabilities on a
consolidated balance sheet of the Company and its Subsidiaries prepared on such
date in accordance with GAAP consistently applied.

     "DEFAULT" means an event or condition the occurrence or existence of which
would, with the lapse of time or the giving of notice or both, become an Event
of Default.

    "DEFAULT RATE" means (i) as to any amount owing with respect to a Note, the
rate of interest stated in clause (b) of the first paragraph of such Note and
(ii) as to any other amount fifteen percent (15%) per annum, but in no event to
exceed the Highest Lawful Rate.

     "ENVIRONMENTAL LAWS" means any and all Federal, state, local, and foreign
statutes, laws, regulations, ordinances, rules, judgments, orders, decrees,
permits, concessions, grants, franchises, licenses, agreements or governmental
restrictions relating to pollution and the protection of the environment or the
release of any materials into the environment, including but not limited to
those related to hazardous substances or wastes, air emissions and discharges to
waste or public systems.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time, and the rules and regulations promulgated thereunder
from time to time in effect.

                                      -2-
<PAGE>
 
     "ERISA AFFILIATE" means any trade or business (whether or not incorporated)
that is treated as a single employer together with the Company under section 414
of the Code.

     "EVENT OF DEFAULT" is defined in SECTION 11.01.

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

     "EXISTING NOTE AGREEMENTS" means that certain Note Purchase Agreement,
dated January 19, 1996, among the Company, the Noteholders and RIMCO Partners,
L.P. III, as amended or modified from time to time and that certain Note
Purchase Agreement, dated May 28, 1996, among the Company and the Noteholders,
as amended or modified from time to time.

     "EXISTING SENIOR NOTES" means the 10% Senior Secured General Obligation
Notes, in the maximum aggregate principal amount of $10,000,000 issued by the
Company under the Existing Note Agreements.

     "EXISTING TRANSACTION DOCUMENTS" means, collectively, (i) the Existing
Company Note Agreements and the other agreements and promissory notes described
or referred to therein, and (ii) the Subsidiary Note Agreement and the other
agreements and promissory notes described or referred to therein.

     "FIDELITY FUNDING AGREEMENT" means, collectively, that certain Loan and
Security Agreement, dated as of August 31, 1995, between Universal Seismic
Acquisition, Inc. and Fidelity Funding, Inc. and that certain Loan and Security
Agreement, dated August 31, 1995, between Universal Seismic Technologies, Inc.
and Fidelity Funding, Inc.

     "GAAP" means generally accepted accounting principles as in effect from
time to time in the United States of America.

     "GOVERNMENTAL AUTHORITY" means (a) the government of (i) the United States
of America or any State or other political subdivision thereof, or (ii) any
jurisdiction in which the Company or any Subsidiary conducts all or any part of
its business, or which asserts jurisdiction over any properties of the Company
or any Subsidiary, or (b) any entity exercising executive, legislative,
judicial, regulatory or administrative functions of, or pertaining to, any such
government.

     "GUARANTY" means, with respect to any Person, any obligation (except the
endorsement in the ordinary course of business of negotiable instruments for
deposit or collection) of such Person guaranteeing or in effect guaranteeing any
indebtedness, dividend or other obligation of any other Person in any manner,
whether directly or indirectly, including (without limitation) obligations
incurred through an agreement, contingent or otherwise, by such Person: (a) to
purchase such indebtedness or obligation or any property constituting security
therefor; (b) to advance or supply funds (i) for the purchase or payment of such
indebtedness or obligation, or (ii) to maintain any working capital or other
balance sheet condition or any income statement condition of any other

                                      -3-
<PAGE>
 
Person or otherwise to advance or make available funds for the purchase or
payment of such indebtedness or obligation; (c) to lease properties or to
purchase properties or services primarily for the purpose of assuring the owner
of such indebtedness or obligation of the ability of any other Person to make
payment of the indebtedness or obligation; or (d) otherwise to assure the owner
of such indebtedness or obligation against loss in respect thereof. In any
computation of the indebtedness or other liabilities of the obliger under any
Guaranty, the indebtedness or other obligations that are the subject of such
Guaranty shall be assumed to be direct obligations of such obliger.

     "HAZARDOUS MATERIAL" means any and all pollutants, toxic or hazardous
wastes or any other substances that might pose a hazard to health or safety, the
removal of which may be required or the generation, manufacture, refining,
production, processing, treatment, storage, handling, transportation, transfer,
use, disposal, release, discharge, spillage, seepage, or filtration of which is
or shall be restricted, prohibited or penalized by any applicable law
(including, without limitation, asbestos, urea formaldehyde foam insulation and
polycholorinated biphenyls).

     "HIGHEST LAWFUL RATE" means with respect to any indebtedness owed to any
Noteholder under any Transaction Document, the maximum nonusurious interest
rate, if any, that at any time or from time to time may be contracted for,
taken, reserved, charged or received by such Noteholder with respect to such
indebtedness under law applicable to such Noteholder.

     "HOLDER" means, with respect to any Note, the Person in whose name such
Note is registered in the register maintained by the Company pursuant to SECTION
12.01.

     "INDEBTEDNESS" with respect to any Person means, at any time, without
duplication, (a) its liabilities for borrowed money and its redemption
obligations in respect of mandatorily redeemable Preferred Stock; (b) its
liabilities for the deferred purchase price of property acquired by such Person
(excluding accounts payable arising in the ordinary course of business but
including all liabilities created or arising under any conditional sale or other
title retention agreement with respect to any such property); (c) all
liabilities appearing on its balance sheet in accordance with GAAP in respect of
Capital Leases; (d) all liabilities for borrowed money secured by any Lien with
respect to any property owned by such Person (whether or not it has assumed or
otherwise become liable for such liabilities); (e) all its liabilities in
respect of letters of credit or instruments serving a similar function issued or
accepted for its account by banks and other financial institutions (whether or
not representing obligations for borrowed money); (f) Swaps of such Person; and
(g) any Guaranty of such Person with respect to liabilities of a type described
in any of clauses (a) through (f) hereof.  Indebtedness of any Person shall
include all obligations of such Person of the character described in clauses (a)
through (g) to the extent such Person remains legally liable in respect thereof
notwithstanding that any such obligation is deemed to be extinguished under
GAAP.

   "INDEMNIFIED PERSON" is defined in SECTION 13.06.

                                      -4-
<PAGE>
 
       "INVESTMENT" means, with respect to any Person, any direct or indirect
 purchase or other acquisition by such Person of stock or other securities of
 any other Person, or any direct or indirect loan, advance or capital
 contribution by such Person to any other Person, and any other item which would
 be classified as an "investment" on a balance sheet of such Person prepared in
 accordance with GAAP.

       "LIEN" means, with respect to any Person, any mortgage, lien, pledge,
 charge, security interest or other encumbrance of any kind (whether voluntary
 or involuntary), or any interest or title of any vendor, lessor, lender or
 other secured party to or of such Person under any conditional sale or other
 title retention agreement or Capital Lease, upon or with respect to any
 property or asset of such Person (including in the case of stock, stockholder
 agreements, voting trust agreements and all similar arrangements).

       "MATERIAL" means material in relation to the business, operations,
 affairs, financial condition, assets, properties, or prospects of the Company
 and its Subsidiaries taken as a whole.

       "MATERIAL ADVERSE EFFECT" means a material adverse effect on (a) the
 business, operations, affairs, financial condition, assets or properties of the
 Company and its Subsidiaries taken as a whole, or (b) the ability of the
 Company to perform its obligations under this Agreement and the other
 Transaction Documents, or (c) the validity or enforceability of this Agreement
 or the other Transaction Documents.

     "MULTIEMPLOYER PLAN" means any Plan that is a "multiemployer plan" (as such
term is defined in section 4001(a)(3) of ERISA).

     "NET INCOME" means, for any period, the consolidated net earnings of the
Company and its Subsidiaries for such period, determined in accordance with
GAAP.

      "NOTEHOLDERS" is defined in the introduction to this Agreement.

     "NOTES" is defined in Section 2.01.

     "OFFICER'S CERTIFICATE" means a certificate of a Senior Financial Officer
or of any other officer of the Company whose responsibilities extend to the
subject matter of such certificate.

     "PBGC" means the Pension Benefit Guaranty Corporation referred to and
defined in ERISA or any successor thereto.

     "PERSON" means an individual, partnership, corporation, limited liability
company, association, trust, unincorporated organization, or a government or
agency or political subdivision thereof.

                                      -5-
<PAGE>
 
     "PLAN" means an "employee benefit plan" (as defined in section 3(3) of
ERISA) that is or, within the preceding five years, has been established or
maintained, or to which contributions are or, within the preceding five years,
have been made or required to be made, by the Company or any ERISA Affiliate or
with respect to which the Company or any ERISA Affiliate may have any liability.

     "PREFERRED STOCK" means any class of capital stock of a corporation that is
preferred over any other class of capital stock of such corporation as to the
payment of dividends or the payment of any amount upon liquidation or
dissolution of such corporation.

     "REQUIRED HOLDERS" means, at any time, the holder or holders of at least
51% in principal amount of the Notes at the time outstanding (exclusive of Notes
then owned by the Company or any of its Affiliates).

     "RESPONSIBLE OFFICER" means any Senior Financial Officer and any other
officer of the Company with responsibility for the administration of the
relevant portion of this Agreement.

     "SECURITIES ACT" means the Securities Act of 1933, as amended from time to
time.

     "SECURITY AGREEMENT" means that certain Second Amended and Restated
Security Agreement of even date herewith granting a first Lien on the collateral
described therein executed by the Company in favor of the Noteholders, as the
same may be supplemented or amended from time to time.

     "SECURITY DOCUMENTS" means the Security Agreement, the Subsidiary Security
Agreement and such other security agreements, guaranties, pledges, instruments,
financing statements or other documents which may be executed to secure the
obligations of the Company with respect to the Notes and this Agreement.

     "SENIOR FINANCIAL OFFICER" means any of the chief financial officer,
principal accounting officer, treasurer or comptroller of the Company.

     "SUBSIDIARY" means, as to any Person, any corporation, association or other
business entity in which such Person or one or more of its Subsidiaries or such
Person and one or more of its Subsidiaries owns sufficient equity or voting
interests to enable it or them (as a group) ordinarily, in the absence of
contingencies, to elect a majority of the directors (or Persons performing
similar functions) of such entity, and any partnership or joint venture if more
than a 50% interest in the profits or capital thereof is owned by such Person or
one or more of its Subsidiaries or such Person and one or more of its
Subsidiaries (unless such partnership can and does ordinarily take major
business actions without the prior approval of such Person or one or more of its
Subsidiaries). Unless the context otherwise clearly requires, any reference to a
"Subsidiary" is a reference to a Subsidiary of the Company.

                                      -6-
<PAGE>
 
     "SUBSIDIARY NOTE AGREEMENT" means that certain Amended and Restated Note
Purchase Agreement, dated of even date herewith, among UNEXCO and the
Noteholders, as amended or modified from time to time.

     "SUBSIDIARY NOTES" means the Amended and Restated 12% Senior Secured
Exchangeable General Obligation Notes, in the maximum aggregate principal amount
of $5,500,000, issued by UNEXCO under the Subsidiary Note Agreement.

     "SUBSIDIARY SECURITY AGREEMENT" means that certain Second Amended and
Restated Security Agreement of even date herewith granting a first Lien on the
Collateral described therein executed by Universal Seismic Acquisition, Inc. in
favor of the Noteholders, as same may be supplemented or amended from time to
time.

     "SWAPS" means, with respect to any Person, payment obligations with respect
to interest rate swaps, currency swaps and similar obligations obligating such
Person to make payments, whether periodically or upon the happening of a
contingency. For the purposes of this Agreement, the amount of the obligation
under any Swap shall be the amount determined in respect thereof as of the end
of the then most recently ended fiscal quarter of such Person, based on the
assumption that such Swap had terminated at the end of such fiscal quarter, and
in making such determination, if any agreement relating to such Swap provides
for the netting of amounts payable by and to such Person thereunder or if any
such agreement provides for the simultaneous payment of amounts by and to such
Person, then in each such case, the amount of such obligation shall be the net
amount so determined.

     "TANGIBLE NET WORTH" means, as of any date, the total shareholder's equity
(including capital stock, additional paid-in capital and retained earnings after
deducting treasury stock) which would appear on a consolidated balance sheet of
the Company and its Subsidiaries prepared as of such date in accordance with
GAAP, minus (i) the amount of any assets resulting from capitalization of
goodwill, organizational expenses, research and development expenses,
trademarks, trade names, copyrights patents, patent applications, licenses and
rights in any thereof, and other similar intangibles, (ii) cash held in a
sinking or other analogous fund established for the purpose of redemption,
retirement or prepayment of capital stock or Indebtedness, and (iii) the amount
of any other items which are treated as intangible assets in accordance with
GAAP.

     "TRANSACTION DOCUMENTS" is defined in SECTION 4.01.

     "UNEXCO" means UNEXCO, Inc., a Delaware corporation and wholly owned
Subsidiary of the Company.

                                      -7-
<PAGE>
 
                                 EXHIBIT 2.01

                                [FORM OF NOTE]

                      UNIVERSAL SEISMIC ASSOCIATES, INC.

                  12% SENIOR SECURED GENERAL OBLIGATION NOTE

No. [   ]                                                         March 27, 1997

$  [               ]

     FOR VALUE RECEIVED, the undersigned, UNIVERSAL SEISMIC ASSOCIATES, INC.
a Delaware 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 twelve percent
(12%) 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 May 1, 1997, on the first day of each month through and
including November 1, 1999, a payment equal to all accrued but unpaid interest
thereon;

     (b) on December 1, 1999, the entire unpaid principal balance hereof,
together with all accrued, but unpaid interest hereon, shall be fully and
finally due and payable; and

     (c) if a Change of Control (as defined in the Note Purchase Agreement
referred to below) shall occur, the entire unpaid principal balance hereof,
together with all accrued, but unpaid interest hereon, shall be fully and
finally due and payable on the date one day after such Change of Control occurs.

     This Note is one of a series of 12% Senior Secured General Obligation
Notes issued pursuant to the Note Purchase Agreement dated of even date herewith
(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.
<PAGE>
 
     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.  This Note is subject to optional
prepayment, in whole or from time to time in part, without notice, premium, fee
or penalty, at the times and on the terms specified in the Note Purchase
Agreement, but not otherwise.

     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.

     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.

                                     UNIVERSAL SEISMIC ASSOCIATES, INC.
 
                                     By: 
                                        -----------------------------
                                         Name: Michael J. Pawelek
                                         Title: President

                                    Page 2
<PAGE>
 
                                 SCHEDULE 5.05

                   TO THE UNIVERSAL SEISMIC ASSOCIATION, INC.
                            NOTE PURCHASE AGREEMENT

                                  SUBSIDIARIES
 
                                         JURISDICTION      PERCENTAGE
SUBSIDIARY                             OF INCORPORATION    OWNERSHIP
- -------------------------------------  ---------------     ----------
UNIVERSAL SEISMIC ACQUISITION, INC.          TEXAS             100%
UNIVERSAL SEISMIC TECHNOLOGIES, INC.         TEXAS             100%
MANNE AUTOMATED SURVEYS, INC.                TEXAS             100%
UNEXCO, INC.                                DELAWARE           100%
<PAGE>
 
                                 SCHEDULE 5.08

          TO THE UNIVERSAL SEISMIC ASSOCIATES NOTE PURCHASE AGREEMENT

1.  No. 95-09~62; The Shamrock Pipe Line Corporation vs. Mitchell Energy
    Corporation, Universal Seismic Acquisition, Inc., Buford Drilling, Inc. and
    Marine Automated Surveys, Inc.; In the 271st Judicial District Court of Wise
    County, Texas ("Shamrock Pipe").

     Universal Seismic Associates, Inc. ("USA") and Marine Automated Surveys,
Inc. ("MAS") are defendants in the above action in which the plaintiffs have
alleged that one or more of the defendants caused the plaintiffs' pipe to
rupture as a result of negligent conduct of seismic testing, resulting in down
time and lost gasoline. Presently USA's insurance company has assumed the
defense and has hired counsel to represent it in the case. MAS is a wholly-owned
subsidiary of USA which was formed for the purpose of acquiring the assets,
including the tradename, of a now dissolved corporation. The asset acquisition
occurred after the alleged incident giving rise to this suit. Accordingly,
plaintiff's counsel believes that the former owner of the corporate name Marine
Automated Surveys, now known as JBX Corporation, will be joined and that all
claims with respect to MAS will be dismissed.

2.   No. 95-12-630; Dessie Schluter, et al. v. Mitchell Energy Corp., et al.; In
     the 271st Judicial District Court of Wise County, Texas.

     This action, which arose out of the same set of facts as Shamrock Pipe, was
brought by the owners of the real property upon which the pipeline in Shamrock
Pipe lies for recovery of damages to such property.

3.   Michael T. Kanarellis, Robert J. Kecseg and the Universal Seismic
     Associates, Inc. Shareholders' Protective Committee v. Universal Seismic
     Associates, Inc., et al.; Civil Action No. 97-22 in United States District
     Court for the District of Delaware.

     This is a case brought by dissident shareholders which originally sought
revocation of proxies submitted in favor of existing management-sponsored
members of the Board of Directors of the Company. The Directors sponsored by
management were elected by a substantial majority of the voting shares and the
District Court declined to overturn the result. The suit was then amended to
add claims against the Company and all of its Board members sounding in
fraudulent misrepresentation and non-disclosure of financial information
relevant to the Company.

4.   Universal Seismic Associates v. Michael T. Kanarellis and Robert T. Kecseg;
     Cause No. 97-12684 in the 334th District Court of Harris County, Texas.

     This is a case brought against the defendants jointly for breaches of
fiduciary duty, disclosure of confidential information and tortious interference
resulting from the defendants' disclosure of various confidential information of
the Company to the public. The defendants have not answered the suit at this
time.
<PAGE>
 
                           To the Universal Seismic
                         Associates, Inc. Note Purchase
                                   Agreement
                             SCHEDULE OF INSURANCE
                        APRIL 19, 1996 TO APRIL 27, 1997

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
                                      POLICY    EFFECTIVE
COVERAGE             COMPANY            NO.       DATES            CURRENT PROGRAM                   PREMIUM 
- ---------------------------------------------------------------------------------------------------------------
<S>                  <C>              <C>        <C>       <C>                                          <C>
General Liability    Ranger Lloyds    GL0705044  4/19/96   2,000,000  Bodily injury and Property     $91,214
                     Ins Co                         to                Damage Combined Single Limit
                                                 4/27/97              General Aggregate - Per Project
                                                           2,000,000  Bodily Injury and Property
                                                                      Damage Combined Single Limit
                                                                      Products/Completed
                                                                      Operations Aggregate
                                                           1,000,000  Bodily Injury and Property
                                                                      Damage Combined Single Limit
                                                                      - Per Occurrence
                                                           1,000,000  Personal and Advertising Injury
                                                                      - Any One Person or Organization
                                                              50,000  Fire Damage Liability - Any One 
                                                                      Occurrence
                                                           1,000,000  Employee Benefits Liability -
                                                                      Each Employee
                                                           1,000,000  Employee Benefits Liability -
                                                                      Annual Aggregate
                                                                           DEDUCTIBLE
                                                               1,000  Employee Benefits Liability -
                                                                      Each Claim
- ------------------------------------------------------------------------------------------------------------
</TABLE> 
<PAGE>
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
                                              POLICY     EFFECTIVE                                            
   COVERAGE                    COMPANY          NO.        DATES               CURRENT PROGRAM                    PREMIUM 
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                          <C>             <C>         <C>        <C>        <C>                                <C>
Business Automobile          Ranger County    TBA 3263    4/19/96   1,000,000  Bodily Injury and Property         $113,730
                             Mutual Ins Co                   to                Damage Combined Single Limit
                                                          4/27/97              - Each Accident Owned Autos,
                                                                               Hired and Non-Owned Autos
                                                                      100,000  Bodily Injury and Property
                                                                               Damage Combined Single Limit
                                                                               Uninsured/Underinsured
                                                                               Motorist
                                                                        2,500  Person Injury Protection - Per
                                                                               Person
                                                                                   DEDUCTIBLE
                                                                        1,000  Comprehensive - Specified
                                                                               Vehicles
                                                                           25  Specified Causes of Loss -
                                                                               Specified Vehicle
                                                                        1,000  Collision - Specified
                                                                               Vehicles
- ------------------------------------------------------------------------------------------------------------------------------------

Workers                      American Home  WC8883401RA   4/27/96   1,000,000  Bodily Injury by Accident - Each   $221,290
Compensation &               Assurance      WC8883402RA     to                 Accident
Employers' Liability         Company                      4/27/97   1,000,000  Bodily Injury by Disease - Policy
                                                                               Limit
                                                                    1,000,000  Bodily Injury by Disease - Each
                                                                               Employee
                                                                    1,000,000  Maritime Coverage
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

<PAGE>
 
<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------------------
                                              POLICY     EFFECTIVE                                            
   COVERAGE                    COMPANY          NO.        DATES               CURRENT PROGRAM                    PREMIUM 
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                          <C>             <C>         <C>        <C>         <C>                               <C>
Umbrella Liability           National Union  BE9322214    4/19/96   5,000,000   Bodily Injury and Property        $46,803
                             Fire Insurance                 to                  Combined Single Limit - Per
                             Company                      4/27/97               Occurrence
                                                                    5,000,000   Bodily Injury and Property
                                                                                Damage Combined Single Limit
                                                                                Products/Completed Operations
                                                                                Aggregate
                                                                    5,000,000   Bodily Injury, Property Damage
                                                                                Combined Single Limit Policy
                                                                                Aggregate (Except Products/
                                                                                Completed Operations and
                                                                                Automobile which is not subject
                                                                                to an aggregate)
                                                                              SELF INSURED RETENTION
                                                                       10,000   Each Occurrence, Applicable to
                                                                                Losses covered in the Excess
                                                                                but not covered in the Primary &
                                                                                when underlying aggregates are
                                                                                exhausted
- ------------------------------------------------------------------------------------------------------------------------------------

Contractors                  Hartford                     4/19/96  22,000,000   Contractors Equipment Blanket     $60,716
Equipment                    Casualty Ins.                  to                  Limit
                              Co.                         4/27/97   3,500,000   Contractors Equipment Any
                                                                                One Item
                                                                      250,000   Waterborne Equipment
                                                                      350,000   Leased/Rented Equipment Any
                                                                                One Loss/Any One Item
                                                                                  DEDUCTIBLE
                                                                       25,000   Per Occurrence - Theft
                                                                       10,000   Per Occurrence - All other perils
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE> 
<PAGE>
 
<TABLE>
<CAPTION>
 
- ------------------------------------------------------------------------------------------------------------------------------------
                                              POLICY     EFFECTIVE                                            
   COVERAGE                    COMPANY          NO.        DATES               CURRENT PROGRAM                    PREMIUM 
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                          <C>             <C>         <C>        <C>         <C>                               <C>
Commercial Property          Hartford                     04/19/96            COMMERCIAL PROPERTY                 $ 1,281
                             Insurance                       to       225,000   Office Contents - Park Ten
                                                          04/27/97              Place
                                                                       75,000   Extra Expense Office
                                                                       10,000   Contents - Jess Pirtle
                                                                       50,000   Contents - Off Premises
                                                                                  DEDUCTIBLE
                                                                        1,000   Per Occurrence - Commercial
                                                                                Property
- ------------------------------------------------------------------------------------------------------------------------------------

Electronic Equipment         Hartford                     04/19/96            ELECTRONIC EQUIPMENT                $ 5,000
                             Casualty Ins.                   to       290,000   Equipment - Park Ten Place
                             Co.                          04/27/97     25,000   Extra Expense
                                                                                  DEDUCTIBLE
                                                                          250   Electronic Equipment
- ------------------------------------------------------------------------------------------------------------------------------------

Directors & Officers         Executive Re    75L004659-    9/19/96  2,000,000   Each Claim and Aggregate         $60,000
Liability                    Indemnity Inc.  95              to                   RETENTION
                                                           9/19/97          0   D&O Section
                                                                       50,000   Corporate Reimbursement
                                                                                Section
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE> 
<PAGE>
 
<TABLE>
<CAPTION>
 
- ------------------------------------------------------------------------------------------------------------------------------------
                                              POLICY     EFFECTIVE                                            
   COVERAGE                    COMPANY          NO.        DATES            CURRENT PROGRAM                     PREMIUM 
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                          <C>             <C>         <C>        <C>         <C>                               <C>
Foreign Package              CIGNA Ins. Co.  PFF047474    02/22/96    FOREIGN COMMERCIAL GENERAL LIABILITY        $2,883
                                                             to     2,000,000   Each Occurrence
                                                          04/19/97  2,000,000   Products/Completed Ops
                                                                                Aggregate
                                                                    1,000,000   Personal & Adveritising Injury
                                                                                Aggregate
                                                                    1,000,000   Premises Damage Limit - each
                                                                                occurrence
                                                                       10,000   Medical Expense Limit
                                                                        EMPLOYEE BENEFITS LLABILLTY
                                                                    1,000,000   Each Claim (Claims Made)
                                                                    1,000,000   Annual Aggregate (Claims
                                                                                Made)
                                                                          CONTINGENT AUTO LLABILLTY
                                                                    1,000,000   Each Accident
                                                                            EMPLOYERS LLABILLTY
                                                                    1,000,000   Bodily Injury by Accident
                                                                    1,000,000   Bodily Injury by Disease (Policy
                                                                                Limits)
                                                                    1,000,000   Bodily Injury by Disease (each
                                                                                employee)
                                                                      250,000   Repatriation Policy Limit
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          JUN-30-1997
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                         204,978
<SECURITIES>                                         0
<RECEIVABLES>                                7,184,302
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                             2,693,314
<PP&E>                                      24,541,052
<DEPRECIATION>                                       0
<TOTAL-ASSETS>                              34,623,646
<CURRENT-LIABILITIES>                       13,305,712
<BONDS>                                     11,605,562
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                   9,712,372
<TOTAL-LIABILITY-AND-EQUITY>                34,623,646
<SALES>                                     24,518,768
<TOTAL-REVENUES>                            24,518,768
<CGS>                                       21,066,213
<TOTAL-COSTS>                               21,066,213
<OTHER-EXPENSES>                             4,747,936
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           1,016,533
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            573,238
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (1,738,676)
<EPS-PRIMARY>                                   (0.34)
<EPS-DILUTED>                                        0
        

</TABLE>


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