Document:

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                                                                   Exhibit 10.04

                                 LOAN AGREEMENT

                                     BETWEEN

                        NATURAL GAS SERVICES GROUP, INC.

                                       AND

                              WESTERN NATIONAL BANK

                         DATED AS OF SEPTEMBER 15, 1999

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                                TABLE OF CONTENTS
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ARTICLE  I DEFINITIONS ...............................................................................................   1

         Section 1.1.     Defined Terms...............................................................................   1
         Section 1.2.     Accounting Principles.......................................................................   6
         Section 1.3.     Directly or Indirectly......................................................................   6
         Section 1.4.     Plural and Singular Forms...................................................................   6
         Section 1.5.     References..................................................................................   6

ARTICLE II AMOUNT AND TERMS OF LOANS..................................................................................   7
         Section 2.1.     The Loans...................................................................................   7
         Section 2.2.     Procedure For Borrowing.....................................................................   7
         Section 2.3.     Borrowing Base..............................................................................   8
         Section 2.4.     Optional and Mandatory Prepayments..........................................................   9
         Section 2.5.     Payment Procedure...........................................................................   9
         Section 2.6.     Order of Application........................................................................   9

ARTICLE III CONDITIONS PRECEDENT......................................................................................  10
         Section 3.1.     Conditions to Initial Advance...............................................................  10
         Section 3.2.     Conditions to Subsequent Advances...........................................................  12
         Section 3.3.     Corporate Proceedings and Documents.........................................................  13

ARTICLE IV REPRESENTATIONS AND WARRANTIES.............................................................................  13
         Section 4.1.     Organization, Existence and Good Standing; Compliance With Law..............................  13
         Section 4.2.     Authorization...............................................................................  13
         Section 4.3.     Enforceable Obligations.....................................................................  14
         Section 4.4.     No Conflicts or Consents....................................................................  14
         Section 4.5.     Financial Statements........................................................................  14
         Section 4.6.     Other Obligations...........................................................................  15
         Section 4.7.     Investments, Advances and Guaranties........................................................  15
         Section 4.8.     Litigation..................................................................................  15
         Section 4.9.     No Burdensome Restrictions..................................................................  15
         Section 4.10.    Taxes.......................................................................................  15
         Section 4.11.    Purpose of Loan.............................................................................  15
         Section 4.12.    Title to Properties; Liens..................................................................  15
         Section 4.13.    Insurance...................................................................................  16
         Section 4.14.    No Default..................................................................................  16
         Section 4.15.    ERISA Plans.................................................................................  16
         Section 4.16.    Principal Business Office and Location of Records...........................................  16
         Section 4.17.    Licenses, Permits and Franchises, Etc.......................................................  16
         Section 4.18.    Subsidiaries................................................................................  16
         Section 4.19.    No Material Omissions or Misstatements......................................................  16
         Section 4.20.    Environmental Matters.......................................................................  17
         Section 4.21.    Investment Company Act......................................................................  18
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         Section 4.22.    Public Utility Holding Company Act..........................................................  18
         Section 4.23.    Year 2000 Compliance........................................................................  18
         Section 4.24.    Federal Regulations.........................................................................  18
         Section 4.25.    Casualties; Taking of Properties............................................................  18
         Section 4.26.    Not A Utility...............................................................................  19

ARTICLE V AFFIRMATIVE COVENANT........................................................................................  19
         Section 5.1.     Financial Statements and Other Information..................................................  19
         Section 5.2.     Taxes; Other Claims.........................................................................  20
         Section 5.3.     Compliance and Maintenance..................................................................  21
         Section 5.4.     Maintenance of Insurance....................................................................  21
         Section 5.5.     Reimbursement of Fees and Expenses..........................................................  21
         Section 5.6.     Indemnification.............................................................................  22
         Section 5.7.     Further Assurances..........................................................................  23
         Section 5.8.     Inspection and Visitation...................................................................  23
         Section 5.9.     Compliance With Laws........................................................................  23
         Section 5.10.    Accounts and Records........................................................................  23
         Section 5.11.    Environmental Complaints....................................................................  23

ARTICLE VI NEGATIVE COVENANTS.........................................................................................  24
         Section 6.1.     Financial Covenants.........................................................................  24
         Section 6.2.     Debt........................................................................................  24
         Section 6.3.     ERISA Compliance............................................................................  25
         Section 6.4.     Amendment of Organizational Documents.......................................................  25
         Section 6.5.     Fiscal Year.................................................................................  25
         Section 6.6.     Nature of Business..........................................................................  25
         Section 6.7.     Disposition of Collateral...................................................................  25
         Section 6.8.     Liens.......................................................................................  25
         Section 6.9.     Dividends, Redemptions and Other Payments...................................................  26
         Section 6.10.    Limitation on Fundamental Changes...........................................................  26
         Section 6.11.    Transactions with Affiliates................................................................  26
         Section 6.12.    Disposition of Assets.......................................................................  26
         Section 6.13.    Limitation on Negative Pledge Clauses.......................................................  27
         Section 6.14.    Terms of Other Agreements...................................................................  27

ARTICLE VII DEFAULT AND REMEDIES......................................................................................  27
         Section 7.1.     Events of Default...........................................................................  27
         Section 7.2.     Remedies....................................................................................  28
         Section 7.3.     Right of Setoff.............................................................................  29
         Section 7.4.     Delegation of Duties and Rights.............................................................  29
         Section 7.5.     Lender Not in Control.......................................................................  29
         Section 7.6.     Waivers by Lender...........................................................................  29
         Section 7.7.     Cumulative Rights...........................................................................  29
         Section 7.8.     Expenditures by Lender......................................................................  29
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ARTICLE VIII MISCELLANEOUS............................................................................................  30
         Section 8.1.     Survival of Representations and Warranties..................................................  30
         Section 8.2.     Communications..............................................................................  30
         Section 8.3.     Binding on Successors.......................................................................  30
         Section 8.4.     Governing Law...............................................................................  31
         Section 8.5.     Usury Savings Clause........................................................................  31
         Section 8.6.     Severability................................................................................  31
         Section 8.7.     Non-Waiver..................................................................................  32
         Section 8.8.     Counterparts................................................................................  32
         Section 8.9.     Amendments and Waivers......................................................................  32
         Section 8.10.    Terms and Headings..........................................................................  32
         Section 8.11.    Conflicts...................................................................................  32
         Section 8.12.    Environmental Indemnity.....................................................................  32
         Section 8.13.    Renewal, Extension or Rearrangement.........................................................  33
         Section 8.14.    Direct Benefit..............................................................................  33
         Section 8.15.    Waivers.....................................................................................  33
         Section 8.16.    Cumulative Rights...........................................................................  33
         Section 8.17.    Governmental Regulation.....................................................................  33
         Section 8.18.    Exhibits....................................................................................  33
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EXHIBITS

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         Exhibit A         Term Promissory Note

         Exhibit B         Revolving Line of Credit Promissory Note

         Exhibit C         Subsequent Advance under Revolving Line of Credit Promissory Note - written notice of borrowing

         Exhibit D         Borrowing Base Report

         Exhibit E         Stock Pledge Agreements

         Exhibit F         Limited Liability Company Pledge Agreements

         Exhibit G         Security Agreement

         Exhibit H         Officer's Certificate

         Exhibit I         Guaranty Agreement

         Exhibit J         Limited Guaranty Agreement

         Exhibit K         Compliance Certificate

         Exhibit L         Consolidated Current Ratio
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         Exhibit M         Consolidated Tangible Net Worth

         Exhibit N         Debt Service Ratio

         Exhibit O         Consolidated Tangible Net Worth

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SCHEDULES

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         Schedule I        Jurisdiction of organization and each other jurisdiction
                           in which the Borrower and its Subsidiaries are qualified
                           to do business

         Schedule II       Term Promissory Note, for the repayment of the indebtedness

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                                 LOAN AGREEMENT

         This LOAN AGREEMENT, dated as of September 15, 1999, is made and
entered into by and between NATURAL GAS SERVICES GROUP, INC., a Colorado
corporation (the "Borrower"), and WESTERN NATIONAL BANK, a national banking
association (the "Lender").

RECITALS

         WHEREAS, the Borrower has requested that the Lender make loans to the
Borrower; and

         WHEREAS, the Bank is agreeable to the Borrower's requests but only upon
and subject to the terms and provisions which are hereinafter specified.

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

                                    ARTICLE I
                                   DEFINITIONS

         SECTION 1.1. DEFINED TERMS. In addition to the terms defined in the
preamble and elsewhere in this Agreement, the following terms shall have the
following meanings:

                  "Advance" means any loan disbursement to or on behalf of
Borrower under any of the Loan Papers, including, without limitation, all
amounts advanced upon the execution hereof under the Notes and all Subsequent
Advances.

                  "Affiliate" means, as to any person, (a) any other person
         (other than a Subsidiary) which, directly or indirectly, is in control
         of, is controlled by, or is under common control with, such person or
         (b) any person who is a director, officer or partner (i) of such
         person, (ii) of any Subsidiary of such person or (iii) of any person
         described in the preceding clause (a). For purposes of this definition,
         "control" of a person means the power, directly or indirectly, either
         to (i) vote 10% or more of the securities having ordinary voting power
         for the election of directors or managers of such person or (ii) direct
         or cause the direction of the management and policies of such person
         whether by contract or otherwise.

                  "Agreement" means this Loan Agreement, as amended, restated,
         supplemented or otherwise modified from time to time.

                  "Bank Liens" means Liens in favor of the Lender, securing all
         or any portion of the Obligations, including, but not limited to,
         Rights in any Collateral created in favor of the Lender, whether by
         mortgage, pledge, hypothecation, assignment, transfer or other granting
         or creation of Liens.

                  "Borrowings Base" means at any date the amount determined
         pursuant to Section 2.3 of this Agreement at such date.

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                  "Borrowing Base Report" shall have the meaning given to such
         term as set forth in Section 2.3(b) of this Agreement.

                  "Business Day" means every day on which Lender is open for
         banking business.

                  "Change of Control" means the occurrence after the date of
         this Agreement of any circumstance or event in which (i) a person shall
         cause or bring about (through solicitation of proxies or otherwise) the
         removal or resignation of a majority of the members of the Board of
         Directors of the Borrower serving in such capacity on the date of this
         Agreement or a person causes or brings about (through solicitation of
         proxies or otherwise) an increase in the size of the existing Board of
         Directors of the Borrower such that the existing members of the Board
         of Directors thereafter represent a minority of the total number of
         persons comprising the entire Board; or (ii) a person, including a
         "group" as defined in Section 13(d)(3) of the Securities Exchange Act
         of 1934, becomes the beneficial owner of shares of any class of stock
         of the Borrower having thirty percent (30%) or more of the total number
         of votes that may be cast for the election of directors of the
         Borrower.

                  "Collateral" means any and all property, tangible or
         intangible, now existing or hereafter acquired, mortgaged, pledged,
         assigned or otherwise encumbered by the Borrower, the Subsidiaries or
         any other person to or for the benefit of the Lender pursuant to any of
         the Loan Papers now or hereafter executed and delivered by the Borrower
         or any of its Subsidiaries or any other person to secure the payment
         and performance of the Notes and obligations of the Borrower hereunder
         or under any of the other Loan Papers, as any such Loan Paper may be
         amended, supplemented or otherwise modified from time to time.

                  "Consolidated Cash Flow" means, with respect to any period of
         calculation thereof, the sum of (i) the consolidated net income (or
         loss) from continuing operations of the Borrower and its Subsidiaries
         during such period (excluding extraordinary income but including
         extraordinary expenses), plus (ii) depreciation, depletion,
         amortization and interest expenses deducted in determining consolidated
         net income (or loss) of the Borrower and its Subsidiaries during such
         period, all determined on a consolidated basis.

                  "Consolidated Current Ratio" means the ratio of (i) the sum of
         the current assets of the Borrower and its Subsidiaries to (ii) the sum
         of the current liabilities of the Borrower and its Subsidiaries, all
         determined on a consolidated basis.

                  "Consolidated Debt" means at a particular date the total Debt
         of the Borrower and its Subsidiaries, determined on a consolidated
         basis.

                  "Consolidated Fixed Charges" means, with respect to any period
         of calculation thereof, the sum of (a) the aggregate principal amount
         of all Debt of the Borrower and its Subsidiaries paid or due and
         payable during such period plus (b) all interest, including, without
         limitation, imputed interest in connection with Financing Leases, paid
         or accrued by the Borrower and its Subsidiaries during such period;
         provided, however, that any

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         principal amount of Debt and any interest payable in one fiscal period
         and paid in another shall not be twice included in Consolidated Fixed
         Charges.

                  "Consolidated Intangible Assets" means those assets of the
         Borrower and its Subsidiaries, determined on a consolidated basis, that
         would be classified as intangible assets in accordance with generally
         accepted accounting principles, but in any event including, without
         limitation, (i) deferred assets, other than prepaid insurance and
         prepaid taxes; (ii) patents, copyrights, trademarks, tradenames,
         franchises, goodwill, experimental expenses and other similar assets
         which would be classified as intangible assets on a balance sheet of
         such person, prepared in accordance with generally accepted accounting
         principles; (iii) unamortized debt discount and expense, and
         unamortized organization and reorganization expense; and (iv) assets
         located, and notes and receivables due from obligors domiciled, outside
         of the United States.

                  "Consolidated Tangible Net Worth" means at a particular date
         (i) the sum of all amounts which would be included under stockholders'
         equity, on a consolidated balance sheet of the Borrower and its
         Subsidiaries, less (ii) the sum of the aggregate book value of
         Consolidated Intangible Assets, all determined on a consolidated basis.

                  "Contractual Obligation" means, as to any person, any
         provision of any security issued by such person or of any agreement,
         instrument or other undertaking to which such person is a party or by
         which it or any of its property is bound.

                  "Debt" means, for the Borrower and any Subsidiary, at any
         particular date, and without duplication, the sum at such date of (i)
         all indebtedness of such person for borrowed money or for the deferred
         purchase price of property or services (other than current trade
         liabilities incurred in the ordinary course of business and payable in
         accordance with customary practices) for which such person is liable,
         contingently or otherwise, as obligor, guarantor or otherwise, or in
         respect of which such person otherwise assures a creditor against loss;
         (ii) all obligations of such person under leases which shall have been,
         or should have been, in accordance with generally accepted accounting
         principles, recorded as capital leases in respect of which such person
         is liable, contingently or otherwise, as obligor, guarantor or
         otherwise, or in respect of which obligations such person otherwise
         assures a creditor against loss; (iii) unfunded vested benefits under
         each ERISA Plan; (iv) all indebtedness and other liabilities secured by
         any Lien on any property owned by such person even though such person
         has not assumed or otherwise become liable for payment thereof; (v) all
         obligations of such person in respect of letters of credit, acceptances
         or similar obligations issued or created for the account of such
         person; and (vi) indebtedness of such person evidenced by a bond,
         debenture, note or similar instrument.

                  "Environmental Complaint" means any complaint, request for
         information, summons, order, demand, citation, notice or other written
         communication from any person or Governmental Authority with respect to
         the existence or alleged existence of a violation of any Requirement of
         Law or liability resulting from any air emission, water discharge,
         noise emission, asbestos, Hazardous Substance or any other
         environmental,

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         health or safety matter at, upon, under or within any of the property
         owned, operated or used by the Borrower or any of its Subsidiaries.

                  "ERISA Plan" shall have the meaning given to such term as set
         forth in Section 4.15 of this Agreement.

                  "Event of Default" shall have the meaning given to such term
         as set forth in Section 7.1 of this Agreement.

                  "Financing Lease" means any lease of property, real or
         personal, the obligations of the lessee in respect of which are
         required in accordance with generally accepted accounting principles to
         be capitalized on a balance sheet of the lessee.

                  "Governmental Authority" means any nation or government, any
         state or other political subdivision thereof and any entity exercising
         executive, legislative, judicial, regulatory or administrative
         functions of or pertaining to government.

                  "Guarantors" means (i) the Subsidiaries identified in Section
         4.18 of this Agreement, (ii) Wallace O. Sellers, (iii) Cav-Rdv, Ltd.,
         (iv) Wallace C. Sparkman and Diamente Investments, L.P., (v) Richard L.
         Yadon and (vi) Danny M. Crocker.

                  "Hazardous Substance" shall have the meaning given to such
         term as set forth in Section 4.20 of this Agreement.

                  "Highest Lawful Rate" means the maximum rate of interest (or,
         if the context so requires, an amount calculated at such rate) which
         Lender is allowed to contract for, charge, take, reserve or receive
         under applicable law after taking into account, to the extent required
         by applicable law, any and all relevant payments or charges under the
         Loan Papers.

                  "Lien" means any interest in property securing an obligation
         owed to, or a claim by, a person other than the owner of the property,
         whether such interest is based on the common law, statute or contract,
         including, but not limited to, a lien or security interest arising from
         any mortgage, encumbrance, pledge, hypothecation, assignment, deposit
         arrangement, or preference, priority or other security agreement
         (including, without limitation, any conditional sale or other title
         retention agreement or trust receipt or a lease, consignment or
         bailment for security purposes). The term "Lien" shall also include
         reservations, exceptions, encroachments, easements, rights of way,
         covenants, conditions, restrictions, leases and other title exceptions
         and encumbrances affecting property.

                  "Loan Papers" means (i) this Agreement, (ii) the Notes and
         (iii) any and all notes, mortgages, deeds of trust, security
         agreements, pledge agreements, financing statements, guaranties, and
         other agreements, documents, certificates, letters and instruments ever
         delivered or executed pursuant to, or in connection with, this
         Agreement, whether existing on the date hereof or thereafter created,
         as any of the same may hereafter be amended, supplemented, extended or
         restated.

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                  "Material Adverse Effect" means any set of circumstances or
         events which (i) has, will or could reasonably be expected to have any
         material adverse effect upon the validity or enforceability of this
         Agreement or any of the other Loan Papers or the Rights or remedies of
         the Lender hereunder or thereunder; (ii) is or could reasonably be
         expected to be material and adverse to the financial condition,
         business, operations, property or prospects of the Borrower or any of
         its Subsidiaries; (iii) will or could reasonably be expected to impair
         the ability of the Borrower or any of its Subsidiaries to perform its
         respective obligations under the terms and conditions of any of the
         Loan Papers to which it is a party; or (iv) will or could reasonably be
         expected to cause an Event of Default.

                  "Material Agreement" of any person means any material written
         or oral agreement, contract, commitment, arrangement or understanding
         to which such person is a party, by which such person is directly or,
         to such person's knowledge, indirectly bound, or to which any asset of
         such person may be subject, which is not cancelable by such person upon
         30 days or less notice without liability for further payment other than
         nominal penalties, excluding, however, such agreements, contracts,
         commitments, arrangements or understandings pursuant to which the
         subject matter thereof does not exceed $50,000.00 in the aggregate.

                  "Notes" means the Term Promissory Note and the Revolving Line
         of Credit Promissory Note, as further described in Section 2.1 of this
         Agreement.

                  "Obligations" means the unpaid principal of and interest on
         the Notes and all other present and future indebtedness, obligations
         and liabilities of the Borrower and any of its Subsidiaries to the
         Lender, and all renewals, rearrangements and extensions thereof, or any
         part thereof, now or hereafter owed to Lender by the Borrower or any of
         its Subsidiaries arising from, by virtue of, or pursuant to any Loan
         Paper, or otherwise, together with all interest accruing thereon and
         all costs, expenses and attorneys' fees incurred in the enforcement or
         collection thereof, whether such indebtedness, obligations and
         liabilities are direct, indirect, fixed, contingent, liquidated,
         unliquidated, joint, several, or joint and several or were, prior to
         acquisition thereof by Lender, owed to some other person.

                  "Prime Rate" means that variable rate of interest per annum
         published in the Money Rates section of The Wall Street Journal as its
         "prime rate." If the Money Rates section of The Wall Street Journal
         does not have a rate designated by it as its "prime rate," then the
         "Prime Rate" shall be deemed to be the variable rate of interest per
         annum which is the general reference rate designated by the Lender as
         its "reference rate," "base rate" or other similar rate and which is
         comparable to the "Prime Rate" as described above. The Prime Rate is
         used by Lender as a general reference rate of interest, taking into
         account such factors as Lender may deem appropriate, it being
         understood that it is not necessarily the lowest or best rate actually
         charged to any customer and that Lender may make various commercial or
         other loans at rates of interest having no relationship to such rate.

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                  "Relevant Environmental Law" means any and all foreign,
         federal, state, local or municipal laws, rules, orders, regulations,
         statutes, ordinances, codes, decrees, requirements of any Governmental
         Authority or other Requirements of Law (including common law)
         regulating, relating to or imposing liability or standards of conduct
         concerning protection of human health, wildlife or the environment, as
         now or may at any time hereafter be in effect.

                  "Requirement of Law" means, as to any person, the certificate
         and articles of incorporation and bylaws, articles of organization,
         regulations or other organizational or governing documents of such
         person, and any law, treaty, rule or regulation or determination of an
         arbitrator or a court or other Governmental Authority, in each case
         applicable to or binding upon such person or any of its property or to
         which such person or any of its property is subject.

                  "Rights" means rights, remedies, powers, privileges and
         benefits.

                  "Subsequent Advance" means any disbursement to or on behalf of
         Borrower after the initial Advance under the Revolving Line of Credit
         Promissory Note pursuant to the provisions of Section 2.1 and Section
         2.2 hereof.

                  "Subsidiary" means, as to the Borrower or any other designated
         person, a corporation, partnership, limited liability company or other
         entity of which shares of stock or other ownership interests having
         ordinary voting power (other than stock or such other ownership
         interests having such power only by reason of the happening of a
         contingency) to elect a majority of the board of directors, managers or
         other governing body of such corporation, partnership, limited
         liability company or other entity are at the time owned, or the
         management of which is otherwise controlled, directly or indirectly,
         through one or more intermediaries, or both, by the Borrower or such
         other designated person.

         SECTION 1.2. ACCOUNTING PRINCIPLES. Where the character or amount of
any asset or liability or item of income or expense is required to be determined
or any consolidation or other accounting computation is required to be made for
the purposes of this Agreement or any other Loan Paper, such determination,
consolidation or computation shall be made in accordance with generally accepted
accounting principles consistently applied, except where such principles are
inconsistent with the requirements or definitions of this Agreement.

         SECTION 1.3. DIRECTLY OR INDIRECTLY. When any provision in this
Agreement refers to action to be taken by any person, or which such person is
prohibited from taking, such provision shall be applicable where the action in
question is taken directly or indirectly.

         SECTION 1.4. PLURAL AND SINGULAR FORMS. The definitions given to terms
defined herein shall be equally applicable to both the singular and plural forms
of such terms.

         SECTION 1.5. REFERENCES. 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, and
section, subsection, schedule and exhibit references are to this Agreement
unless otherwise specified.

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                                   ARTICLE II
                            AMOUNT AND TERMS OF LOANS

         SECTION 2.1. THE LOANS. Subject to and upon the terms and conditions
and relying on the representations and warranties contained in this Agreement,
Lender agrees to make loans to the Borrower as follows:

                  (a) Term Loans - Contemporaneously with the execution and
         delivery hereof, the Borrower shall execute and deliver to the Lender
         the Term Promissory Note in the form of Exhibit A hereto in the
         original principal amount of $1,500,000.00 (the "Term Promissory
         Note"). Subject to and upon the terms and conditions of this Agreement,
         the entire amount of the Term Promissory Note will be funded in a
         single Advance. The Term Promissory Note shall be stated to mature five
         years from the date of such note and shall bear interest on the unpaid
         principal amount thereof from time to time outstanding at the
         applicable interest rate per annum as provided in the Term Promissory
         Note. Principal and interest on the Term Promissory Note shall be
         payable in the manner and on the dates specified therein.

                  (b) Revolving Loans - Contemporaneously with the execution and
         delivery hereof, the Borrower shall execute and deliver to the Lender
         the Revolving Line of Credit Promissory Note in the form of Exhibit B
         hereto in the original principal amount of $750,000.00 (the "Revolving
         Line of Credit Promissory Note"). Subject to and upon the terms and
         conditions of this Agreement and the Revolving Line of Credit
         Promissory Note, the Borrower may request one or more Advances and
         borrow, prepay and reborrow at any time and from time to time under the
         Revolving Line of Credit Promissory Note; provided, however, the
         aggregate principal amount of all Advances outstanding at any one time
         under the Revolving Line of Credit Promissory Note shall never exceed
         the lesser of (i) $750,000.00 or (ii) the Borrowing Base then in
         effect. The Revolving Line of Credit Promissory Note shall be stated to
         mature two years from the date of such note and shall bear interest on
         the unpaid principal amount thereof from time to time outstanding at
         the applicable interest rate per annum as provided in the Revolving
         Line of Credit Promissory Note. Principal and interest on the Revolving
         Line of Credit Promissory Note shall be payable in the manner and on
         the dates specified therein.

         SECTION 2.2.      PROCEDURE FOR BORROWING.

                  (a) At the time of the initial Advance under the Term
         Promissory Note or the Revolving Line of Credit Promissory Note, as the
         case may be, the conditions set forth in Section 3.1 of this Agreement
         shall have been satisfied and, with respect to each Subsequent Advance
         under the Revolving Line of Credit Promissory Note, the conditions set
         forth in Section 3.2 hereof shall have been satisfied at the time of
         each such Subsequent Advance. At the time of each request for a
         Subsequent Advance under the Revolving Line of Credit Promissory Note,
         the Borrower shall simultaneously furnish to the Lender a written
         notice of borrowing (dated as of the date of the request for such
         Subsequent Advance and otherwise being in substantially the form
         attached hereto as Exhibit C) confirming (i) the amount of the
         requested Subsequent Advance and (ii) the absence of any Event of
         Default at the date of such request. Each request for a

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<PAGE>
         Subsequent Advance under the Revolving Line of Credit Promissory Note
         must be in the minimum amount of $50,000.00 or the unadvanced portion
         of the Revolving Line of Credit Promissory Note, whichever is less.
         Assuming the satisfaction of the conditions set forth in this Section
         2.2, requests for Subsequent Advances under the Revolving Line of
         Credit Promissory Note will be funded on the same Business Day that
         Lender receives Borrower's request for each such Subsequent Advance;
         provided that Borrower's request is received by the Lender prior to
         12:00 noon on the date of any such request.

                  (b) The Lender shall maintain in accordance with its usual
         practice one or more accounts or other records evidencing the
         Obligations of the Borrower to the Lender resulting from each loan made
         by the Lender from time to time under the Notes, including the amounts
         of principal and interest payable and paid to the Lender from time to
         time under this Agreement and each respective Note. The entries made in
         such accounts or records of the Lender shall be prima facie evidence of
         the existence and amounts of the Obligations of the Borrower and its
         Subsidiaries therein recorded; provided, however, that the failure of
         the Lender to maintain any such accounts or records, or any error
         therein, shall not in any manner affect the absolute and unconditional
         obligation of the Borrower to repay (with applicable interest) all
         loans made to the Borrower in accordance with the terms of this
         Agreement and the Notes.

         SECTION 2.3. BORROWING BASE. The Borrowing Base shall be determined as
follows:

         (a) Initial Borrowing Base. The initial Borrowing Base shall be
$750,000.00 during the period from the date hereof to the date on which the
Borrower receives notice of the first redetermination of the Borrowing Base by
the Lender pursuant to Section 2.3(b) and thereafter the amount of the Borrowing
Base shall be the Borrowing Base most recently determined pursuant to Section
2.3(b).

                  (b) Redeterminations of the Borrowing Base.

                           (i) No later than 30 days after the end of each
                  month, the Borrower shall, at its own expense, furnish to the
                  Bank a borrowing base report (the "Borrowing Base Report") in
                  the form attached hereto as Exhibit D, which shall be dated as
                  of the end of each such month.

                           (ii) Within 15 days after it receives each Borrowing
                  Base Report, the Lender shall redetermine the Borrowing Base,
                  and shall notify the Borrower of the new Borrowing Base, if
                  any; provided, however, if the Lender does not so notify the
                  Borrower of a new Borrowing Base within such 15-day period,
                  then the Borrowing Base set forth in the Borrowing Base Report
                  furnished to the Lender by the Borrower pursuant to Section
                  2.3(b)(i) shall be deemed to be the redetermined Borrowing
                  Base until a new Borrowing Base is redetermined by the Lender
                  and notice of such new Borrowing Base is given by the Lender
                  to the Borrower. Each redetermination of the Borrowing Base
                  shall be made by the Lender in the exercise of its sole
                  discretion in accordance with the then current standards and
                  practices of the Lender for similar loans, taking into account
                  such factors as the Lender may deem appropriate, including,
                  without limitation, the

                                       8
<PAGE>
                  nature and extent of the Borrower's interest in the accounts
                  and leases receivable and inventory upon which the Borrowing
                  Base is then redetermined and the anticipated timing and
                  extent of net operating income therefrom. The Lender may in
                  its sole discretion discount the value of any property
                  included in the redetermination of the Borrowing Base as set
                  forth in a Borrowing Base Report by the same factors utilized
                  by it in discounting the value of comparable borrowing base
                  assets in comparable transactions for comparable borrowers.

                           (iii) Each delivery by the Borrower to the Lender of
                  a Borrowing Base Report shall be deemed to constitute a
                  representation and warranty by the Borrower to the Lender that
                  the Borrower and its Subsidiaries have good and marketable
                  title to the Collateral owned by each of them and described
                  therein, and that such Collateral is not subject to any Lien
                  other than Bank Liens and Liens permitted by Section 6.8.

         SECTION 2.4.      OPTIONAL AND MANDATORY PREPAYMENTS.

                  (a) The Borrower may at any time and from time to time prepay
         either one or both of the Notes, in whole or in part, without premium
         or penalty, upon prior or simultaneous irrevocable notice to the
         Lender, specifying the Note to be prepaid, the date and the amount of
         prepayment. If any such notice is given, the amount specified in such
         notice shall be due and payable on the date specified therein. Partial
         prepayments shall be in an aggregate principal amount of $20,000.00 or
         a whole multiple thereof, or shall equal the aggregate outstanding
         balance of the Note being prepaid.

                  (b) If the aggregate unpaid principal amount of the Revolving
         Line of Credit Promissory Note shall at any time exceed the Borrowing
         Base at such time, the Lender shall so notify the Borrower, and the
         Borrower shall, within fifteen Business Days after such notification,
         prepay the principal of the Revolving Line of Credit Promissory Note in
         an aggregate amount at least equal to such excess, together with
         accrued interest on the amount prepaid to the date of such prepayment.

         SECTION 2.5. PAYMENT PROCEDURE. Each payment or prepayment on the Notes
must be made at the principal office of Lender in funds which are or will be
available for immediate use by Lender on or before 12:00 noon Midland, Texas
time on the day such payment is due or such prepayment is made. In any case
where a payment of principal of, or interest on, the Notes is due on a day which
is not a Business Day, the Borrower shall be entitled to delay such payment
until the next succeeding Business Day, but interest shall continue to accrue
until the payment is in fact made.

         SECTION 2.6. ORDER OF APPLICATION. Except as otherwise provided in the
Loan Papers, all payments and prepayments on the Obligations, including proceeds
from the exercise of any Rights of Lender under the Loan Papers, shall be
applied to the Obligations in the following order: (i) first, to reasonable
expenses for which Lender shall not have been reimbursed under the Loan Papers
and then to all amounts to which Lender is entitled to indemnification under the
Loan Papers; (ii) to the accrued interest on the Note being paid or prepaid;
(iii) to the principal of

                                       9
<PAGE>
the Note being paid or prepaid and, with regard to the Term Promissory Note,
applied upon installments of most remote maturity; and (iv) to the remaining
Obligations.

                                   ARTICLE III

                              CONDITIONS PRECEDENT

         SECTION 3.1. CONDITIONS TO INITIAL ADVANCE. The obligation of Lender to
make the initial Advance pursuant to this Agreement under either one of the
Notes is subject to the satisfaction and fulfillment of each of the following
conditions precedent which shall have occurred on or before the date hereof, or
simultaneously with the closing of the transactions contemplated by this
Agreement, unless compliance therewith shall have been waived in writing by
Lender:

                  (a) There shall have been duly executed, where appropriate,
and delivered by the Borrower (and/or any other requisite party thereto) the
following:

                      (i) this Agreement;

                      (ii) the Term Promissory Note;

                      (iii) the Revolving Line of Credit Promissory Note;

                      (iv) the Stock Pledge Agreements covering the capital
                  stock of NGE Leasing, Inc., Flare King, Inc. and Natural Gas
                  Engine Co., in each case being in substantially the form
                  attached hereto as Exhibit E;

                      (v) the Limited Liability Company Pledge Agreements
                  covering the limited liability company membership interests of
                  Hi-Tech Compressor Company, L.C. and Gas Engine Service, LLC,
                  in each case being in substantially the form attached hereto
                  as Exhibit F;

                      (vi) the Security Agreement in substantially the form
                  attached hereto as Exhibit G;

                      (vii) a certificate of account status (good standing) and
                  a certificate of existence for Borrower in the jurisdiction
                  under the laws of which Borrower is organized and in each
                  jurisdiction wherein Borrower's operations, transaction of
                  business or ownership of property make qualification as a
                  foreign corporation necessary;

                      (viii) an Officer's Certificate in substantially the form
                  attached hereto as Exhibit H, which shall contain the names
                  and signatures of the officers of the Borrower authorized to
                  execute Loan Papers and which shall certify to the truth,
                  correctness and completeness of the following exhibits
                  attached thereto: (A) a copy of resolutions duly adopted by
                  the Board of Directors of the Borrower and in full force and
                  effect at the time this Agreement is entered into, covering
                  the matters described in subparagraph (d) below of this
                  Section 3.1, (B) a copy of the charter documents of Borrower
                  and all amendments thereto, certified by the

                                       10
<PAGE>
                  appropriate official of Borrower's state of organization, and
                  (C) a copy of the bylaws of Borrower, and certifying as to
                  such other matters as Lender may reasonably require; and

                      (ix) such other documents or instruments as Lender may
                  reasonably require.

                      (b) There shall have been executed, where appropriate, and
                  delivered by the Guarantors (and/or any other requisite party
                  thereto) the following, all of which shall be in form and
                  substance satisfactory to Lender and its counsel:

                      (i) in the case of the Subsidiaries, the Guaranty
                  Agreement in substantially the form attached hereto as Exhibit
                  I:

                      (ii) in the case of the Guarantors other than the
                  Subsidiaries, the Limited Guaranty Agreement in substantially
                  the form attached hereto as Exhibit J;

                      (iii) in the case of the Subsidiaries, a Security
                  Agreement in substantially the form attached hereto as Exhibit
                  G;

                      (iv) a certificate of account status (good standing) and a
                  certificate of existence for each Subsidiary in the
                  jurisdiction under the laws of which each Subsidiary is
                  organized and in each jurisdiction wherein its operations,
                  transaction of business or ownership of property made
                  qualification as a foreign entity necessary;

                      (v) an Officer's Certificate of each Subsidiary in
                  substantially the form attached hereto as Exhibit H, which
                  shall contain the names and signatures of the officers or
                  members of each Subsidiary authorized to execute Loan Papers
                  and which shall certify to the truth, correctness and
                  completeness of the following exhibits attached thereto: (A) a
                  copy of resolutions duly adopted by the Board of Directors or
                  Managers, as the case may be, of such Subsidiary and in full
                  force and effect at the time this Agreement is entered into,
                  covering the matters described in subparagraph (e) below of
                  this Section 3.1, (B) a copy of the charter or other
                  organizational documents of each such Subsidiary and all
                  amendments thereto, certified by the appropriate official of
                  such Subsidiary's state of organization, and (C) a copy of the
                  bylaws or regulations of each such Subsidiary, and certifying
                  as to such other matters as Lender may reasonably require; and

                      (vi) such other documents or instruments as Lender may
                  reasonably require.

                  (c) All requirements of notice to perfect each Bank Lien shall
         have been accomplished or arrangements made therefor to the
         satisfaction of Lender and its counsel;

                                       11
<PAGE>

                  (d) The Borrower shall have approved the execution, delivery
         and performance of the Loan Papers to which it is a party by
         resolutions satisfactory to Lender and its counsel, authorizing (i) the
         execution, delivery and performance of this Agreement, the Notes and
         the other Loan Papers to which the Borrower is a party, (ii) the
         borrowings contemplated hereunder and (iii) the granting by it of the
         pledge and security interests pursuant to the Loan Papers to which the
         Borrower is a party and appropriate certificates as to such actions,
         showing the parties authorized to execute the Loan Papers and all items
         required herein, shall have been delivered to the Lender;

                  (e) The respective boards of directors, managers, or other
         governing body, as the case may be, of each Guarantor (excluding
         Messrs. Sellers, Sparkman, Yadon and Crocker) shall have approved the
         execution, delivery and performance of the Loan Papers to which it is a
         party by resolutions satisfactory to Lender and its counsel,
         authorizing (i) the execution, delivery and performance of the Loan
         Papers to which it is a party, (ii) acknowledging the benefits and
         consideration to such Guarantor from the borrowings contemplated
         hereunder and (iii) authorizing the granting by it of the pledge and
         security interests pursuant to the Loan Papers to which it is a party
         and appropriate certificates as to such actions, showing the parties
         authorized to execute such Loan papers and all items required herein,
         shall have been delivered to Lender;

                  (f) There shall exist no Event of Default hereunder, nor shall
         any events or circumstances have occurred, and not theretofore been
         cured, which with notice or lapse of time or both, would constitute an
         Event of Default hereunder;

                  (g) The representations and warranties of the Borrower
         contained in Article IV shall be true and correct in all material
         respects;

                  (h) No suit, action or other proceeding by a third party or a
         Governmental Authority shall be pending or threatened which relates to
         this Agreement or the transactions contemplated hereby; and

                  (i) All Liens (other than Bank Liens) securing the Debt
         described in Section 4.11 hereof shall be released, terminated or
         assigned to the Lender, or arrangements made therefor satisfactory to
         the Lender in its sole discretion.

         SECTION 3.2. CONDITIONS TO SUBSEQUENT ADVANCES. The obligation of the
Lender to make any Subsequent Advance under the Revolving Line of Credit
Promissory Note requested to be made by the Borrower on any date is subject to
the satisfaction of the following conditions precedent:

                  (a) Each of the representations and warranties made by the
         Borrower in or pursuant to the Loan Papers shall be true and correct in
         all material respects on and as of such date as if made on and as of
         such date.

                  (b) No Event of Default shall have occurred and be continuing
         on such date or after giving effect to the Subsequent Advance requested
         to be made on such date.

                                       12
<PAGE>

                  (c) Notwithstanding Section 2.4(b), after giving effect to the
         Advances under the Revolving Line of Credit Promissory Note requested
         by Borrower to be made on any date, the aggregate principal amount of
         the Revolving Line of Credit Promissory Note then outstanding shall not
         exceed the lesser of (i) $750,000.00 or (ii) the Borrowing Base then in
         effect.

                  (d) No litigation, investigation or proceeding of or before
         any arbitrator or Governmental Authority shall be pending or, to the
         knowledge of the Borrower, threatened by or against the Borrower or the
         Lender with respect to this Agreement or any of the other Loan Papers
         or the transactions contemplated by this Agreement or any of the other
         Loan Papers.

                  (e) The Lender shall have received all Borrowing Base Reports
         required to be delivered by Borrower pursuant to Section 2.3(b)(i).

         Each borrowing by the Borrower hereunder shall constitute a
representation and warranty by the Borrower as of the date thereof that the
conditions contained in this Section 3.2 have been satisfied.

         SECTION 3.3. CORPORATE PROCEEDINGS AND DOCUMENTS. In addition to the
conditions precedent set forth in Section 3.1 and Section 3.2, all corporate and
other proceedings, and all documents, instruments and other legal matters in
connection with the transactions contemplated by this Agreement and the other
Loan Papers shall be satisfactory in form, substance and date to the Lender, and
Lender shall have received such other documents and legal opinions in respect of
any aspect or consequence of the transactions contemplated hereby or thereby as
it shall reasonably request.

                                   ARTICLE IV

                         REPRESENTATIONS AND WARRANTIES

         As a material inducement to Lender to enter into this Agreement, the
Borrower hereby represents and warrants to the Lender that:

         SECTION 4.1. ORGANIZATION, EXISTENCE AND GOOD STANDING; COMPLIANCE WITH
LAW. The Borrower and each of its Subsidiaries (a) is duly organized, validly
existing and in good standing under the laws of its state of organization, (b)
is duly qualified, in good standing and authorized to do business in each
jurisdiction where the character of its operations, transaction of business or
ownership of property makes such qualification necessary, except where the
absence of qualification, good standing or authorization would not have a
Material Adverse Effect and (c) is in compliance with all Requirements of Law,
except to the extent that the failure to comply therewith could not, in the
aggregate, reasonably be expected to have a Material Adverse Effect. Schedule I
attached hereto sets forth the jurisdiction of organization and each other
jurisdiction in which the Borrower and its Subsidiaries are qualified to do
business.

         SECTION 4.2. AUTHORIZATION. Each of the Borrower and its Subsidiaries
has the corporate or limited liability company power and authority, and the
legal right, to make, deliver and perform the Loan Papers to which it is a party
and, in the case of the Borrower, to borrow hereunder, and in the case of the
Subsidiaries, to guarantee the obligations of the Borrower

                                       13
<PAGE>
hereunder, and each of the Borrower and its Subsidiaries has taken all necessary
corporate or limited liability company action to authorize the borrowings and
other transactions on the terms and conditions of each Loan Paper to which it is
a party, the grant of the Bank Liens on the Collateral pursuant to the Loan
Papers to which it is a party and the execution, delivery and performance of the
Loan Papers to which it is a party.

         SECTION 4.3. ENFORCEABLE OBLIGATIONS. This Agreement and each of the
other Loan Papers to which the Borrower or any of its Subsidiaries is a party
have been duly executed and delivered on behalf of the Borrower or its
Subsidiaries, as the case may be. This Agreement constitutes and the other Loan
Papers to which the Borrower or any of its Subsidiaries is a party, when
executed and delivered will constitute, a legal, valid and binding obligation of
the Borrower and any of its Subsidiaries, as the case may be, enforceable
against the Borrower and any of its Subsidiaries, as the case may be, in
accordance with its terms, except as enforceability may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance,
fraudulent transfer or similar laws affecting the enforcement of creditors'
rights generally and by general equitable principles (whether enforcement is
sought by proceedings in equity or at law).

         SECTION 4.4. NO CONFLICTS OR CONSENTS. The execution, delivery and
performance of this Agreement, the Notes and the other Loan Papers, the
borrowings hereunder and the use of the proceeds thereof will not violate any
Requirement of Law or Contractual Obligation of the Borrower or any of its
Subsidiaries and will not result in, or require, the creation or imposition of
any Lien on any of its or their respective properties, assets or revenues
pursuant to any such Requirement of Law or Contractual Obligation, except as
contemplated by the Loan Papers. No consent or authorization of, filing with or
other act by or in respect of, any Governmental Authority or any other person is
required in connection with the borrowings hereunder or with the execution,
delivery, performance, validity or enforceability of this Agreement, the Notes
or the other Loan Papers.

         SECTION 4.5. FINANCIAL STATEMENTS. The combined audited financial
statements of CNG Engines Co., Flare King, Inc., Hi-Tech Compressor Company,
L.C., NGE Leasing, Inc. (formerly Natural Gas Engine Co.) and Gas Engine
Services, LLC for the fiscal year ended December 31, 1998, and the interim
unaudited consolidated financial statements of the Borrower and its Subsidiaries
for the five-month period ended May 31, 1999, which have been delivered to
Lender, are complete and correct as they relate to the Borrower and its
Subsidiaries, have been prepared in accordance with generally accepted
accounting principles, consistently applied, and present fairly the consolidated
financial condition and results of operations of the Borrower and its
Subsidiaries, as of the dates and for the periods stated (subject only to normal
year-end adjustments with respect to such unaudited interim statements). During
the period from December 31, 1998 to and including the date hereof, no change
has occurred in the condition, financial or otherwise, of the Borrower and its
consolidated Subsidiaries, taken as a whole, which could reasonably be expected
to result in a Material Adverse Effect, and there has been no sale, transfer or
other disposition by the Borrower or any of its Subsidiaries since December 31,
1998 of any material part of its business or property and no purchase or other
acquisition of any business or property material in relation to the consolidated
condition, financial or otherwise, of the Borrower and its Subsidiaries.

                                       14
<PAGE>

         SECTION 4.6. OTHER OBLIGATIONS. As of the date hereof, neither Borrower
nor any Subsidiary has any outstanding Debt or other material liabilities,
direct or indirect, absolute or contingent, which is, in the aggregate, material
to the Borrower and its Subsidiaries and not shown in the financial statements
referred to in Section 4.5 hereof. Borrower is not aware of any fact,
circumstance, act, condition or development which will have or which threatens
to have any Material Adverse Effect.

         SECTION 4.7. INVESTMENTS, ADVANCES AND GUARANTIES. At the date of this
Agreement, Borrower has not made investments in, advances to or guaranties of
the obligations of any person, except as reflected in the financial statements
referred to in Section 4.5 hereof.

         SECTION 4.8. LITIGATION. There is no litigation, legal, administrative
or arbitral proceeding, investigation or other action of any nature pending or,
to the knowledge of the Borrower, threatened against or affecting the Borrower
which involves the possibility of any judgment or liability not fully covered by
indemnity agreements or insurance, and which would have a Material Adverse
Effect.

         SECTION 4.9. NO BURDENSOME RESTRICTIONS. No unusual or unduly
burdensome restriction, restraint or hazard exists under or by reason of any
Contractual Obligation or, to the best of Borrower's knowledge, any Requirement
of Law.

         SECTION 4.10. TAXES. All tax returns required to be filed by the
Borrower and its Subsidiaries with all Governmental Authorities have been filed,
and all taxes, assessments, fees and other governmental charges imposed upon
Borrower and its Subsidiaries or upon any of their respective property, income
or franchises which are due and payable, have been paid (other than any the
amount or validity of which are currently being contested in good faith by
appropriate proceedings and with respect to which reserves in conformity with
generally accepted accounting principles have been provided on the consolidated
financial statements of the Borrower); and no tax Lien has been filed and, to
the knowledge of Borrower, no claim is being asserted with respect to any such
tax, fee or other charge.

         SECTION 4.11. PURPOSE OF LOAN. The proceeds of the loans made pursuant
to Section 2.1 and evidenced by the Notes will be used for the following
purposes:

                  (a) with respect to loans made pursuant to and evidenced by
         the Term Promissory Note, for the repayment of the indebtedness
         described on Schedule II hereto; and

                  (b) with respect to loans made pursuant to and evidenced by
         the Revolving Line of Credit Promissory Note, for general working
         capital purposes.

         SECTION 4.12. TITLE TO PROPERTIES; LIENS. Each of the Borrower and its
Subsidiaries have good record and defensible title to, or a valid leasehold
interest in, all its real property, and good title to all its other properties
and, except for Liens of the type permitted under Section 6.8 of this Agreement,
there are no Liens on any properties or assets of the Borrower or any of its
Subsidiaries.

                                       15
<PAGE>

         SECTION 4.13. INSURANCE. The Borrower and its Subsidiaries maintain
with financially sound and reputable insurance companies insurance in at least
such amounts and against at least such risks (but including in any event public
liability) as are usually insured against in the same general area by companies
engaged in the same or a similar business and such insurance is otherwise in
compliance with the Loan Papers.

         SECTION 4.14. NO DEFAULT. Neither the Borrower nor any of its
Subsidiaries is in default under or with respect to any of its Contractual
Obligations in any respect, other than defaults which could not have a Material
Adverse Effect. No Event of Default has occurred and is continuing.

         SECTION 4.15. ERISA PLANS. Borrower does not have any plans subject to
the Employee Retirement Income Security Act of 1974, as amended ("ERISA Plan").

         SECTION 4.16. PRINCIPAL BUSINESS OFFICE AND LOCATION OF RECORDS. The
Borrower's principal place of business and chief executive offices are located
at 710 Buffalo Street, Suite 201, Corpus Christi, Texas 78401, and the records
of the Borrower and each of its Subsidiaries concerning its ownership of assets,
business and operations are located at such address.

         SECTION 4.17. LICENSES, PERMITS AND FRANCHISES, ETC. The Borrower and
each of its Subsidiaries owns, or is licensed to use, all permits, know-how,
processes, technology, franchises, patents, patent rights, trade names,
trademarks, trademark rights and copyrights which are necessary or required for
the ownership or operation of its properties and the conduct of its business.
Borrower is not aware of any fact or condition that might cause any of such
rights not to be renewed in due course.

         SECTION 4.18. SUBSIDIARIES. The following constitute all the
Subsidiaries of the Borrower at the date hereof:

                  C.N.G. Engines Company
                  Flare King, Inc.
                  Hi-Tech Compressor Company, L.C.
                  NGE Leasing, Inc.
                  Gas Engine Service, LLC

         Each such Subsidiary is wholly owned by the Borrower, except that (i)
Gas Engine Service, LLC is a wholly owned Subsidiary of C.N.G. Engines Company
and (ii) Hi-Tech Compressor Company, L.C. is owned 50% by the Borrower and 50%
by Flare King, Inc.

         SECTION 4.19. NO MATERIAL OMISSIONS OR MISSTATEMENTS. No information,
exhibit or report furnished to Lender by the Borrower in connection with the
negotiation of this Agreement contains any material misstatement of fact or
omits to state a material fact or any fact necessary to make the statements
contained therein not misleading. Without limiting the generality of the
foregoing, there are no material facts relating to the Loan Papers, the
Collateral or the financial condition, assets, liabilities, results of
operations or business of the Borrower or any of its Subsidiaries which could,
collectively or individually, have a Material Adverse Effect and which have not
been disclosed in writing to Lender as an exhibit to this Agreement or in the
financial statements of the Borrower referred to in Section 4.5 of this
Agreement.

                                       16
<PAGE>

         SECTION 4.20.     ENVIRONMENTAL MATTERS.

                  (a) No Environmental Complaint has been issued or filed, no
         penalty has been assessed and, to the knowledge of Borrower, no
         investigation or review is pending or threatened by any Governmental
         Authority or other person (i) with respect to any alleged violation of
         any law, ordinance, rule, regulation or order of any Governmental
         Authority in connection with the property, operations or conduct of the
         business of the Borrower or any of its Subsidiaries, (ii) with respect
         to any alleged failure to have any permit, certificate, license,
         approval, requisition or authorization required in connection with the
         property, operations or conduct of the business of the Borrower or any
         of its Subsidiaries or (iii) with respect to any generation, treatment,
         storage, recycling, transportation or disposal or release, all as
         defined in 42 USC Section 9601(22) ("Release") (other than Releases in
         compliance with Relevant Environmental Laws or permits issued
         thereunder), of any toxic, caustic or otherwise hazardous substance,
         including petroleum, its derivatives, by-products and other
         hydrocarbons, solid waste, contaminants, polychlorinated biphenyls,
         paint containing lead, urea, formaldehyde, foam insulation, and
         discharge of sewage or effluent, whether or not regulated under
         federal, state or local environmental statutes, ordinances, rules,
         regulations or orders ("Hazardous Substance") generated by the
         operations or business, or located at any property, of the Borrower or
         any of its Subsidiaries.

                  (b) Except in substantial compliance with Relevant
         Environmental Laws and permits issued thereunder (i) neither the
         Borrower nor its Subsidiaries, nor the businesses conducted by the
         Borrower and its Subsidiaries, have placed, held, located or disposed
         of any Hazardous Substance on, under or at any property now or
         previously owned or leased by the Borrower or any of its Subsidiaries,
         and none of such properties has been used (by the Borrower or any of
         its Subsidiaries) as a dump site or storage (whether permanent or
         temporary) site for any Hazardous Substance; (ii) no polychlorinated
         biphenyls, urea or formaldehyde is or has been present at any property
         now or previously owned or leased by the Borrower or any of its
         Subsidiaries; (iii) no asbestos is or has been present at any property
         now or previously owned or leased by the Borrower or any of its
         Subsidiaries; (iv) there are no underground storage tanks which have
         been used to store or have contained any Hazardous Substance, active or
         abandoned, at any property now or previously owned or leased by the
         Borrower or any of its Subsidiaries; (v) no Hazardous Substance has
         been released at, on or under any property previously owned or leased
         by the Borrower or any of its Subsidiaries; and (vi) no Hazardous
         Substance has been released or is present, in a reportable or threshold
         quantity, where such a quantity has been established by statute,
         ordinance, rule, regulation or order, at, on or under any property now
         or previously owned by the Borrower or any of its Subsidiaries.

                  (c) The Borrower and its Subsidiaries have not transported or
         arranged for the transportation (directly or indirectly) of any
         Hazardous Substance to any location which is listed or proposed for
         listing under the Comprehensive Environmental Response, Compensation
         and Liability Act of 1980, as amended by the Superfund Amendments and
         Reauthorization Act of 1986 ("CERCLA"), the Comprehensive Environmental
         Response, Compensation and Liability Information System ("CERCLIS") or
         on any similar state list

                                       17
<PAGE>
         or which is the subject of federal, state or local enforcement actions
         or other investigations.

                  (d) There are no environmental Liens on any property owned or
         leased by the Borrower or any of its Subsidiaries, and no actions by
         any Governmental Authority have been taken or are in the process of
         being taken which could subject any of such properties to such Liens.

                  (e) Prior to the date hereof, the Borrower has provided to
         Lender all environmental investigations, studies, audits, tests,
         reviews or other analyses conducted by or which are in the possession
         of the Borrower or any of its Subsidiaries in relation to any property
         or facility now or previously owned or leased by the Borrower or any of
         its Subsidiaries.

         SECTION 4.21. INVESTMENT COMPANY ACT. Neither the Borrower nor any of
its Subsidiaries is an "investment company" or a company "controlled" by an
"investment company," within the meaning of the Investment Company Act of 1940,
as amended.

         SECTION 4.22. PUBLIC UTILITY HOLDING COMPANY ACT. The Borrower is not a
"holding company," or a "subsidiary company" of a "holding company," or an
"affiliate" of a "holding company" or of a "subsidiary company" of a "holding
company," or a "public utility" within the meaning of the Public Utility Holding
Company Act of 1935, as amended.

         SECTION 4.23. YEAR 2000 COMPLIANCE. The Borrower has analyzed its
operations and the operations of its Subsidiaries that could be adversely
affected by failure to be "Year 2000" compliant (that is, that computer
applications, imbedded microchips and other systems will be able to perform
date-sensitive functions prior to and after December 31, 1999). Based on its
analysis, the computer systems and operations of the Borrower and its
Subsidiaries are Year 2000 compliant, except to the extent that any failure
therein or the cost to modify or repair its systems could not reasonably be
expected to have a Material Adverse Effect.

         SECTION 4.24. FEDERAL REGULATIONS. No part of the proceeds of any loan
will be used for "purchasing" or "carrying" any "margin stock" within the
respective meanings of each of the quoted terms under Regulation G or Regulation
U of the Board of Governors of the Federal Reserve System as now and from time
to time hereafter in effect. If requested by the Bank, the Borrower will furnish
to the Bank a statement to the foregoing effect in conformity with the
requirements of FR Form G-1 or FR Form U-1 referred to in said Regulation G or
Regulation U, as the case may be.

         SECTION 4.25. CASUALTIES; TAKING OF PROPERTIES. Since the dates of the
financial statements of the Borrower and its Subsidiaries delivered to the
Lender and described in Section 4.5, neither the business nor the assets or
properties of the Borrower or any Subsidiary have been affected (to the extent
it is reasonably likely to cause a Material Adverse Effect), as a result of any
fire, explosion, earthquake, flood, drought, windstorm, accident, strike or
other labor disturbance, embargo, requisition or taking of property or
cancellation of contracts, permits or concessions by and domestic or foreign
government or any agency thereof, riot, activities of armed forces or acts of
God or of any public enemy.

                                       18
<PAGE>

         SECTION 4.26. NOT A UTILITY. Neither the Borrower nor any of its
Subsidiaries is an entity engaged in the State of Texas in the (i) generation,
transmission or distribution and sale of electric power; (ii) transportation,
distribution and sale through a local distribution system of natural or other
gas for domestic, commercial, industrial or other use; (iii) provision of
telephone or telegraph service to others; (iv) production, transmission or
distribution and sale of steam or water; (v) operation of a railroad; or (vii)
provision of sewer service to others.

                                    ARTICLE V

                              AFFIRMATIVE COVENANT

         As a material inducement to Lender to enter into this Agreement, the
Borrower hereby covenants and agrees that from the date hereof until payment in
full of the Obligations, the Borrower shall and shall cause each of its
Subsidiaries to:

         SECTION 5.1. FINANCIAL STATEMENTS AND OTHER INFORMATION. Promptly
furnish to Lender copies of (i) such information regarding its business and
affairs and financial condition as Lender may reasonably request, and (ii)
without request, the following:

                  (a) as soon as available, but in any event not later than 90
         days after the end of each fiscal year of the Borrower, a copy of the
         audited consolidated balance sheet of the Borrower and its consolidated
         Subsidiaries as at the end of such year and the related consolidated
         statements of income and changes in cash flows for such year, setting
         forth in each case in comparative form the figures for the previous
         year, reported on without a "going concern" or like qualification or
         exception, or qualification arising out of the scope of the audit, by
         Hein + Associates LLP or other independent certified public accounting
         firm of recognized standing acceptable to the Lender;

                  (b) as soon as available, but in any event not later than 30
         days after the end of each month, the unaudited consolidated balance
         sheet of the Borrower and its consolidated Subsidiaries as at the end
         of such month and the related unaudited consolidated statements of
         income and changes in cash flows of the Borrower and its consolidated
         Subsidiaries for such month and for the period from the beginning of
         the most recent fiscal year to the end of such month, certified by the
         chief financial officer of the Borrower (subject to normal year-end
         audit adjustments);

                  (c) as soon as available, but in any event not later than 30
         days after the end of each month, calculations of the Consolidated
         Current Ratio, Consolidated Tangible Net Worth, Debt Service Ratio and
         Consolidated Debt to Consolidated Tangible Net Worth Ratio of the
         Borrower for the periods required as set forth in Section 6.1 of this
         Agreement;

                  (d) as soon as available, but in any event not later than 30
         days after the end of each month, a list of all accounts payable and
         accounts receivable of the Borrower and its consolidated Subsidiaries,
         and an aging of such accounts on the basis of 30-60-90 and over 90 days
         from date of invoice;

                                       19
<PAGE>

                  (e) promptly upon their becoming available, but in any event
         not later than five days after the same are sent, copies of all
         financial statements, reports, notices and proxy statements sent or
         made available generally by the Borrower to its shareholders, of all
         regular and periodic reports and all private placement memorandums and
         all registration statements and prospectuses, if any, filed by the
         Borrower with any securities exchange or with the Securities and
         Exchange Commission; and all press releases and other statements made
         available generally by the Borrower to the public concerning material
         developments in the business of the Borrower;

                  (f) immediately after becoming aware of the existence of, or
         any material change in the status of, any Environmental Complaint or
         any litigation which could have a Material Adverse Effect if determined
         adversely against the Borrower or any of its Subsidiaries, a written
         communication to Lender of such matter;

                  (g) immediately upon becoming aware of an Event of Default or
         the existence of any condition or event which constitutes, or with
         notice or lapse of time, or both, would constitute an Event of Default,
         a verbal notification to Lender specifying the nature and period of
         existence thereof and what action the Borrower is taking or proposes to
         take with respect thereto and, immediately thereafter, a written
         confirmation to Lender of such matters;

                  (h) immediately after becoming aware that any person has given
         notice or taken any action with respect to a claimed default under any
         indenture, mortgage, deed of trust, promissory note, loan agreement,
         note agreement, joint venture agreement or any other Material Agreement
         or other undertaking to which the Borrower or any Subsidiary is a
         party, a verbal notification to Lender specifying the notice given or
         action taken by such person and the nature of the claimed default and
         what action the Borrower is taking or proposes to take with respect
         thereto and, immediately thereafter, a written communication to Lender
         of such matters;

                  (i) within 30 days after the end of each month, the Borrowing
         Base Report required by Section 2.3(b)(i) of this Agreement; and

                  (j) within 30 days after the end of each month, a compliance
         certificate in the form attached hereto as Exhibit K, which shall be
         signed by the chief executive officer or principal financial officer of
         the Borrower.

         SECTION 5.2. TAXES; OTHER CLAIMS. Pay and discharge all taxes,
assessments and governmental charges or levies imposed upon the Borrower and its
Subsidiaries, or upon or in respect of all or any part of the income, property
or business of the Borrower and its Subsidiaries, all trade accounts payable in
accordance with usual and customary business terms, and all claims for work,
labor or materials, which, if unpaid, might become a Lien or charge upon any or
all of the property of the Borrower or any of its Subsidiaries; provided
however, the Borrower and its Subsidiaries shall not be required to pay any such
tax, assessment, charge, levy, account payable or claim if (i) the validity,
applicability or amount thereof is currently being contested in good faith by
appropriate actions or proceedings diligently conducted which will prevent the
forfeiture or sale of any property of the Borrower and its Subsidiaries or any
material

                                       20
<PAGE>
interference with the use thereof by the Borrower or its Subsidiaries, and (ii)
the Borrower shall have set aside on its consolidated financial statements
reserves therefor deemed adequate under generally accepted accounting
principles.

         SECTION 5.3. COMPLIANCE AND MAINTENANCE. (i) Maintain its corporate
existence, rights and franchises; (ii) observe and comply with all Requirements
of Law, including, without limitation, Relevant Environmental Laws; and (iii)
maintain the Collateral and all other equipment, properties and assets (and any
properties, equipment and assets leased by or consigned to it or held under
title retention or conditional sales contracts) in good and workable condition
at all times and make all repairs, replacements, additions, betterments and
improvements to its properties, equipment and assets as are needful and proper
so that the business carried on in connection therewith may be conducted
properly and efficiently at all times.

         SECTION 5.4. MAINTENANCE OF INSURANCE. Maintain with financially sound
and reputable insurers, insurance with respect to its properties and business
against such liabilities, casualties, risks and contingencies and in such types
and amounts as is customarily carried by companies engaged in the same or
similar businesses and similarly situated. From time to time, upon request by
Lender, the Borrower will furnish Lender with copies of certificates, binders
and policies necessary to give Lender reasonable assurance of the existence of
such coverage. Borrower agrees to promptly notify Lender of any termination or
other material change in Borrower's insurance coverage and, if requested by
Lender, to provide Lender with all information about the renewal of each policy
at least 15 days prior to the expiration thereof. In the case of any fire,
accident or other casualty causing loss or damage to any property of Borrower,
the proceeds of such policies in excess of $50,000.00 shall, at Borrower's
option, be used to (i) replace the lost or damaged property with similar
property having a value at least equivalent to the lost or damaged property, or
(ii) prepay the Term Promissory Note and the Revolving Line of Credit Promissory
Note, in that order.

         SECTION 5.5. REIMBURSEMENT OF FEES AND EXPENSES. Pay all reasonable
fees and expenses incurred by Lender and its designated representatives in
connection with this Agreement, all renewals hereof, the other Loan Papers or
other transactions pursuant hereto or to the other Loan Papers, whether the
services provided hereunder or thereunder are provided directly by Lender or by
a third party selected by Lender, as well as all costs of filing and
recordation, all reasonable legal and accounting fees, all costs associated with
enforcing any of Lender's Rights under the Loan Papers, including, without
limitation, costs of repossessing, storing, transporting, preserving and
insuring any Collateral that Borrower or any of its Subsidiaries may pledge to
Lender, all court costs associated with enforcing or defending Lender's Rights
against the Borrower, its Subsidiaries or any third party challenging said
Rights and any other cost or expense incurred by Lender or its designated
representatives in connection herewith or with the other Loan Papers, together
with interest at a rate per annum 2% above the Prime Rate on each such amount
commencing on the date notice of such expenditure is given to the Borrower by
Lender until the date it is repaid to Lender.

                                       21
<PAGE>

         SECTION 5.6. INDEMNIFICATION. Indemnify, save and hold harmless the
Lender and its Affiliates, directors, officers, agents, attorneys and employees
(collectively, the "Indemnitees") from and against: (a) any and all claims,
demands, actions or causes of action that are asserted against any Indemnitee by
any person (other than the Borrower) if the claim, demand, action or cause of
action directly or indirectly relates to a claim, demand, action or cause of
action that such person asserts or may assert against the Borrower, any
Affiliate of the Borrower or any officer, director or shareholder of the
Borrower; (b) any and all claims, demands, actions or causes of action that are
asserted against any Indemnitee by any person (other than the Borrower) if the
claim, demand, action or cause of action arises out of or relates to the loans
made by Lender to the Borrower under the Notes and this Agreement, the use or
contemplated use of proceeds of such loans or the relationship of the Borrower
and the Lender under this Agreement; (c) any administrative or investigative
proceeding by any Governmental Authority arising out of or related to a claim,
demand, action or cause of action described in clause (a) or (b) above; and (d)
any and all liabilities, losses, costs or expenses (including reasonable
attorneys' fees and disbursements) that any Indemnitee suffers or incurs as a
result of any of the foregoing; provided, that no Indemnitee shall be entitled
to indemnification for any liability, loss, cost or expense caused by its own
gross negligence or willful misconduct. If any claim, demand, action or cause of
action is asserted against any Indemnitee and such Indemnitee intends to claim
indemnification from the Borrower under this Section 5.6, such Indemnitee shall
promptly notify the Borrower, but the failure to so promptly notify the Borrower
shall not affect the obligations of the Borrower under this Section 5.6 unless
such failure materially prejudices the Borrower's right to participate, or the
Borrower's rights, if any, in the contest of such claim, demand, action or cause
of action, as hereinafter provided. Each Indemnitee may, and if requested by the
Borrower in writing shall, in good faith contest the validity, applicability and
amount of such claim, demand, action or cause of action with counsel selected by
such Indemnitee and reasonably acceptable to the Borrower, and shall permit the
Borrower to participate in such contest. Any Indemnitee that proposes to settle
or compromise any claim or proceeding for which the Borrower may be liable for
payment of indemnity hereunder shall give the Borrower written notice of the
terms of such proposed settlement or compromise reasonably in advance of
settling or compromising such claim or proceeding and shall obtain the
Borrower's prior written consent, which consent shall not be unreasonably
withheld. In connection with any claim, demand, action or cause of action
covered by this Section 5.6 against more than one Indemnitee, all such
Indemnitees shall be represented by the same legal counsel selected by the
Indemnitees and reasonably acceptable to the Borrower; provided, that if such
legal counsel determines in good faith and advises the Borrower in writing that
representing all such Indemnitees would or could result in a conflict of
interest under legal requirements or ethical principles applicable to such legal
counsel or that a defense or counterclaim is available to an Indemnitee that is
not available to all such Indemnitees, then to the extent reasonably necessary
to avoid such a conflict of interest or to permit unqualified assertion of such
a defense or counterclaim, each Indemnitee shall be entitled to separate
representation by legal counsel selected by that Indemnitee and reasonably
acceptable to the Borrower. Any obligation or liability of the Borrower to any
Indemnitee under this Section 5.6 shall survive the expiration or termination of
this Agreement and the repayment of the Loans and the payment of all other
Obligations owing to the Lender for the statute of limitations period applicable
to such claim or contest.

                                       22
<PAGE>

         SECTION 5.7. FURTHER ASSURANCES. Use its best efforts to cure any
defects in the execution and delivery of any of the Loan Papers to which it is a
party and in any other instrument or document referred to or mentioned herein,
and immediately execute and deliver to Lender, upon Lender's request, all such
other and further instruments as may be required or desired by Lender from time
to time in compliance with or accomplishment of the covenants and agreements of
the Borrower made herein and in the other Loan Papers.

         SECTION 5.8. INSPECTION AND VISITATION. Permit any officer, employee,
agent or representative of Lender to visit and inspect any of the properties and
assets of the Borrower and its Subsidiaries, examine all of its books, records
and accounts, and take copies and extracts therefrom, all at such reasonable
times and during normal business hours as Lender may request and, further, the
Borrower shall allow and does hereby grant Lender the right to contact any
employees, associates, Affiliates, officers, accountants and auditors of
Borrower and its Subsidiaries as Lender may desire, and upon the occurrence and
during the continuance of an Event of Default, Lender shall have the right to
contact the customers of Borrower and its Subsidiaries.

         SECTION 5.9. COMPLIANCE WITH LAWS. Comply with all Requirements of Law,
the violation of which could have a Material Adverse Effect.

         SECTION 5.10. ACCOUNTS AND RECORDS. Keep books of record and account in
which full, true and correct entries will be made of all dealings or
transactions in relation to its business and activities, in accordance with
generally accepted accounting principles consistently applied, except only for
changes in accounting principles or practices with which the Borrower's
independent public accountants concur.

         SECTION 5.11. ENVIRONMENTAL COMPLAINTS. Promptly give notice to Lender
(a) of any Environmental Complaint affecting the Borrower or any of its
Subsidiaries, any property owned, operated or used by the Borrower or any of its
Subsidiaries, or any part thereof or the operations of the Borrower or any of
its Subsidiaries, or any other person on or in connection with such property or
any part thereof (including receipt by the Borrower or any of its Subsidiaries
of any notice of (i) the happening of any event involving the use, spill,
release, leak, seepage, discharge or clean-up of any Hazardous Substance or (ii)
any complaint, order, citation or notice with regard to air emissions, water
discharges, or any other environmental, health or safety matter affecting the
Borrower or any of its Subsidiaries from any person or entity (including without
limitation the United States Environmental Protection Agency)), and (b) of any
notice from any person of (i) any violation or alleged violation of any Relevant
Environmental Law relating to any such property or any part thereof or any
activity at any time conducted on any such property, (ii) the occurrence of any
release, spill or discharge in a quantity that is reportable under any Relevant
Environmental Law or (iii) the commencement of any clean-up pursuant to or in
accordance with any Relevant Environmental Law of any Hazardous Substance on or
about any such property or any part thereof.

                                       23
<PAGE>

                                   ARTICLE VI
                               NEGATIVE COVENANTS

         As a material inducement to Lender to enter into this Agreement, the
Borrower covenants and agrees that from the date hereof until payment in full of
the Obligations, the Borrower shall not, and (except with respect to Section
6.1) shall not permit any of its Subsidiaries to, directly or indirectly:

         SECTION 6.1.      FINANCIAL COVENANTS.

                  (a) Consolidated Current Ratio. Permit the Consolidated
         Current Ratio, as defined herein and calculated pursuant to Exhibit L
         hereto, to be less than .80 to 1.0 as of the end of each month through
         and including December 31, 1999, or less than 1.0 to 1.0 as of the end
         of each month after December 31, 1999.

                  (b) Consolidated Tangible Net Worth. Permit the Consolidated
         Tangible Net Worth, as defined herein and calculated pursuant to
         Exhibit M hereto, to be less than $2,000,000.00 as of the end of each
         month through and including December 31, 1999, or less than
         $2,500,000.00 as of the end of each month after December 31, 1999.

                  (c) Debt Service Ratio. Permit the ratio of (i) Consolidated
         Cash Flow to (ii) Consolidated Fixed Charges, as such terms are defined
         herein and as calculated pursuant to Exhibit N hereto, to be less than
         1.25 to 1.00 for each "rolling" three-month period ending on the date
         the calculation of such ratio is made, with the first such calculation
         to be made and dated as of September 30, 1999, followed by a similar
         calculation at the end of each succeeding month. As an example, for the
         calculation to be made on September 30, 1999, such ratio for the months
         of July, August and September shall not be less than 1.25 to 1.00 for
         such three-month period; such ratio for the three-month period ended
         October 31, 1999 shall not be less than 1.25 to 1.00 for the months of
         August, September and October; and so forth.

                  (d) Consolidated Debt to Consolidated Tangible Net Worth
         Ratio. Permit the ratio of (i) Consolidated Debt to (ii) Consolidated
         Tangible Net Worth, as such terms are defined herein and calculated
         pursuant to Exhibit O hereof, to be more than 2.00 to 1.00 as of the
         end of each month.

                  SECTION 6.2. DEBT. Create, assume, incur or have outstanding
         any Debt, except:

                  (a) Debt of the Borrower and its Subsidiaries to the Lender;

                  (b) Debt existing on the date of this Agreement which is set
         forth in the financial statements referred to in Section 4.5 of this
         Agreement (excluding, however, the Debt described in Schedule I hereto
         which shall be repaid in its entirety on the day the initial Advance is
         made to Borrower under the Term Promissory Note), but not any increases
         thereof;

                                       24
<PAGE>

                  (c) obligations for the payment of rent or hire of property
         under leases or lease agreements which would not cause the aggregate
         amount of all payments made by the Borrower and its Subsidiaries
         pursuant to such leases or lease agreements to exceed $200,000.00
         during any calendar year; and

                  (d) additional Debt of the Borrower and its Subsidiaries not
         to exceed $100,000.00 in the aggregate principal amount at any one time
         outstanding.

         SECTION 6.3.      ERISA COMPLIANCE.

                  (a) Engage in any "prohibited transaction" as such term is
         defined in Section 4975 of the Internal Revenue Code of 1986, as
         amended;

                  (b) incur any "accumulated funding deficiency" as such term is
         defined in Section 302 of ERISA; or

                  (c) terminate any such plan in a manner which could result in
         the imposition of a Lien on the property of Borrower or any Subsidiary
         pursuant to Section 4068 of ERISA.

         SECTION 6.4. AMENDMENT OF ORGANIZATIONAL DOCUMENTS. Amend or otherwise
modify its articles of incorporation, regulations, articles of organization or
otherwise change its corporate or limited liability company structure in any
manner.

         SECTION 6.5. FISCAL YEAR. Permit its fiscal year to end on a day other
than the last day of December of each year.

         SECTION 6.6. NATURE OF BUSINESS. Make any significant or substantial
change in the nature of its business as being conducted on the date of this
Agreement.

         SECTION 6.7. DISPOSITION OF COLLATERAL. Sell, transfer, lease,
exchange, alienate or otherwise dispose of (whether in one transaction or in a
series of transactions) all or any part of the Collateral, except as permitted
by Section 6.12.

         SECTION 6.8. LIENS. Create, incur, assume or permit to exist any Lien
upon any of its properties, assets or revenues, whether now owned or hereafter
acquired, or agree to do any of the foregoing, except:

                  (a) Bank Liens;

                  (b) Liens to secure payments of workmen's compensation,
         unemployment insurance, old age pensions or other social security;

                  (c) deposits or pledges to secure performance of bids,
         tenders, contracts (other than contracts for the payment of money),
         leases, public or statutory obligations, surety or appeal bonds, or
         other deposits or pledges for purposes of like general nature in the
         ordinary course of business;

                                       25
<PAGE>

                  (d) Liens for taxes, assessments or other governmental charges
         or levies which are not delinquent or which are in good faith being
         contested by appropriate proceedings; provided, however, this exception
         shall not allow any Lien imposed by the U.S. Government for failure to
         pay income, payroll, FICA or similar taxes, other than any such Lien
         where (i) the validity, applicability or amount thereof is being
         contested in good faith by appropriate proceedings which will prevent
         the forfeiture or sale of any property of the Borrower or any
         Subsidiary or any material interference with the use thereof by the
         Borrower or any Subsidiary, and (ii) the Borrower shall have set aside
         on its books reserves appropriate within generally accepted accounting
         principles with respect thereto;

                  (e) vendors', operators', materialmen's, mechanics',
         carriers', workmen's, repairmen's or other like Liens arising by
         operation of law in the ordinary course of business and securing
         obligations less than 90 days from the date of invoice, and on which no
         suit to foreclose has been filed, or which are in good faith being
         contested by appropriate proceedings;

                  (f) Liens created by or resulting from any litigation or legal
         proceeding which is being contested in good faith by appropriate
         proceedings; and

                  (g) Liens permitted by the other Loan Papers.

         SECTION 6.9. DIVIDENDS, REDEMPTIONS AND OTHER PAYMENTS. Declare or pay
any dividends (except dividends payable solely in its own capital stock or
limited liability company membership interests, as the case may be) on, or
redeem, retire, purchase or otherwise acquire for value, any shares of any class
of its respective shares of capital stock or limited liability company
membership interests, as the case may be, now or hereafter outstanding, or
return any capital to its shareholders or members, as the case may be, or make
any other distribution in respect thereof, whether in cash or property or in
obligations of the Borrower or any Subsidiary.

         SECTION 6.10. LIMITATION ON FUNDAMENTAL CHANGES. Enter into any merger,
consolidation or amalgamation, or liquidate, wind up or dissolve itself (or
suffer any liquidation or dissolution), or convey, sell, lease, assign, transfer
or otherwise dispose of (whether in one transaction or in a series of related
transactions), all or substantially all of its property, business or assets
(whether now owned or hereafter acquired), or make any material change in its
present method of conducting business.

         SECTION 6.11. TRANSACTIONS WITH AFFILIATES. Enter into any transaction
(including, but not limited to, the sale or exchange of property or the
rendering of services) with any of its Affiliates, other than in the ordinary
course of business and upon terms no less favorable than could be obtained in an
arm's-length transaction with a person that was not an Affiliate.

         SECTION 6.12. DISPOSITION OF ASSETS. Sell, convey, transfer, lease,
exchange, alienate or otherwise dispose of any of its respective property or
assets, except, to the extent not otherwise prohibited under the other Loan
Papers:

                  (a) equipment which is worthless or obsolete or which is
         replaced by equipment of equal suitability and value; and

                                       26
<PAGE>

                  (b) inventory and equipment which is sold or leased in the
         ordinary course of business.

         SECTION 6.13. LIMITATION ON NEGATIVE PLEDGE CLAUSES. Enter into with
any person any agreement, other than (a) this Agreement and (b) the other Loan
Papers, which prohibits or limits the ability of the Borrower or any of its
Subsidiaries to create, incur, assume or suffer to exist any Lien upon any of
its property, assets or revenues, whether now owned or hereafter acquired.

         SECTION 6.14. TERMS OF OTHER AGREEMENTS. Become a party to any
agreement (or any amendment, supplement, extension or other modification thereto
or thereof) which, in any manner (i) violates, conflicts with or creates a
breach of any of the terms or provisions of this Agreement or any of the other
Loan Papers, (ii) provides for the granting or conveyance to any person other
than Lender of Liens on or affecting the Collateral, or (iii) restricts the
Borrower's or any of its Subsidiaries (a) rights of ownership, possession or
operation of all or any part of the Collateral or (b) rights or ability to
direct the use or disposition of all or any part of the Collateral or (c) which
requires the consent of any person (other than Lender) to use or dispose of any
of the Collateral for any purpose or to act or refrain from acting with respect
thereto.

                                   ARTICLE VII
                              DEFAULT AND REMEDIES

         SECTION 7.1. EVENTS OF DEFAULT. If any one or more of the following
shall occur and shall not have been remedied in the period, if any, provided
for, an "Event of Default" shall be deemed to have occurred hereunder and with
respect to all of the Obligations, unless waived in writing by Lender:

                  (a) default shall be made in the payment when due of any
         installment of principal or interest on the Notes or any other
         Obligations;

                  (b) any representation or warranty made by the Borrower herein
         or in any of the other Loan Papers or in any certificate, document or
         financial or other statement furnished to Lender under or in connection
         with this Agreement or any other Loan Paper shall be or shall prove to
         have been incorrect or untrue or misleading in any material respect on
         or as of the date made or deemed made and shall continue unremedied for
         a period of 30 days after the earlier of (i) the Borrower becoming
         aware of such default or (ii) the Lender giving notice thereof to the
         Borrower;

                  (c) default shall be made by the Borrower or any Subsidiary in
         the due performance or observance of any covenant, condition or
         agreement contained in any of the Loan Papers to which it is a party
         and such default shall continue unremedied for a period of 30 days
         after the earlier of (i) Borrower becoming aware of such default or
         (ii) the Lender giving notice thereof to the Borrower;

                  (d) Borrower or any Subsidiary shall (i) apply for or consent
         to the appointment of a receiver, trustee or liquidator of itself or of
         all or a substantial part of its assets; (ii) be unable, or admit in
         writing its inability, or fail to confirm its ability (when requested
         to do so by Lender) to pay its debts as they become due; (iii) make a
         general assignment for the benefit of creditors; (iv) be adjudicated a
         bankrupt or insolvent or file

                                       27
<PAGE>

         a voluntary petition in bankruptcy; (v) file a petition or an answer
         seeking reorganization or an arrangement with creditors or to take
         advantage of any bankruptcy or insolvency law; (vi) file an answer
         admitting the material allegations of, or consent to, or default in
         answering, a petition filed against it in any bankruptcy,
         reorganization or insolvency proceedings; or (vii) take any action for
         the purpose of effecting any of the foregoing;

                  (e) an order, judgment or decree shall be entered by any court
         of competent jurisdiction approving a petition seeking reorganization
         of the Borrower or any of its Subsidiaries or appointing a receiver,
         trustee or liquidator of the Borrower or any of its Subsidiaries or of
         all or a substantial part of its assets, and such order, judgment or
         decree shall continue unstayed in effect for any period of 30
         consecutive days;

                  (f) the failure of the Borrower or any of its Subsidiaries to
         have discharged within a period of 30 days after the commencement
         thereof any attachment, sequestration or similar proceeding against any
         of its properties or assets having a value of $100,000 or more;

                  (g) any acceleration, notice of default, default, filing of
         suit or notice of breach by any lender, lessor, creditor or other party
         to any Material Agreement to which the Borrower or any of its
         Subsidiaries is a party, or to which its properties or assets are
         subject;

                  (h) the occurrence of a Material Adverse Effect with respect
         to Borrower or any of its Subsidiaries;

                  (i) the occurrence of a Change of Control; or

                  (j) final judgment or judgments shall be entered against the
         Borrower or any of its Subsidiaries involving in the aggregate a
         liability (not paid or fully covered by insurance or not otherwise
         covered by indemnity agreements acceptable to Lender in its sole
         discretion) of $50,000.00 or more, and such judgment or judgments shall
         not have been vacated, discharged, stayed or bonded pending appeal
         within 60 days from the entry thereof.

         SECTION 7.2.      REMEDIES.

                  (a) Upon the occurrence of any Event of Default described in
         Section 7.1(d) or Section 7.1(e) hereof, the lending obligations, if
         any, of Lender hereunder shall immediately terminate, and the entire
         principal amount of all Obligations then outstanding together with
         interest then accrued and unpaid thereon shall become immediately due
         and payable, all without demand and presentment for payment, notice of
         nonpayment, protest, notice of protest, notice of dishonor, notice of
         intention to accelerate maturity or notice of acceleration of maturity,
         or any other notice of default of any kind, all of which are hereby
         expressly waived by the Borrower.

                                       28
<PAGE>

                  (b) Upon the occurrence and at any time during the continuance
         of any other Event of Default specified in Section 7.1 hereof, Lender
         may, by written notice to the Borrower, (i) declare the entire
         principal amount of all Obligations then outstanding, together with
         interest then accrued and unpaid thereon, to be immediately due and
         payable without demand and presentment for payment, notice of
         nonpayment, protest, notice of protest, notice of dishonor, notice of
         intention to accelerate maturity or notice of acceleration of maturity,
         or any other notice of default of any kind, all of which are hereby
         expressly waived by the Borrower, and (ii) terminate the lending
         obligations, if any, of Lender hereunder unless and until Lender shall
         reinstate same in writing.

         SECTION 7.3. RIGHT OF SETOFF. Upon the occurrence and during the
continuance of any Event of Default, or if the Borrower becomes insolvent,
however, evidenced, Lender is hereby authorized at any time and from time to
time, without prior notice to Borrower (any such notice being expressly waived
by the Borrower), to setoff 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 Lender to or for the credit or the account of Borrower against
any and all of the Obligations, irrespective of whether or not Lender shall have
made any demand under this Agreement or the Notes and although such Obligations
may be unmatured. Lender agrees promptly to notify Borrower after any such
setoff and application, provided that the failure to give such notice shall not
affect the validity of such setoff and application. The rights of Lender under
this Section 7.3 are in addition to other rights and remedies (including,
without limitation, other rights of setoff) which Lender may have.

         SECTION 7.4. DELEGATION OF DUTIES AND RIGHTS. Lender may perform any of
its duties or exercise any of its Rights under the Loan Papers by or through its
officers, directors, employees, attorneys, agents or other representatives.

         SECTION 7.5. LENDER NOT IN CONTROL. None of the covenants or other
provisions contained in this Agreement or the other Loan Papers shall, or shall
be deemed to, give Lender the Right to exercise control over the affairs or
management of the Borrower.

         SECTION 7.6. WAIVERS BY LENDER. The acceptance by Lender at any time
and from time to time of part payment on the Obligations shall not be deemed to
be a waiver of any Event of Default then existing. No waiver by Lender of any
Event of Default shall be deemed to be a waiver of any other then existing or
subsequent Event of Default. No delay or omission by Lender in exercising any
Right under this Agreement or any of the other Loan Papers shall impair such
Right or be construed as a waiver thereof or any acquiescence therein.

         SECTION 7.7. CUMULATIVE RIGHTS. All Rights available to Lender under
this Agreement and the other Loan Papers are cumulative of, and in addition to,
all other Rights available to Lender at law or in equity. The exercise or
partial exercise of any such Right shall not preclude the exercise of any other
Right under the Loan Papers or otherwise.

         SECTION 7.8. EXPENDITURES BY LENDER. All court costs, reasonable
attorneys' fees, other costs of collection, and other sums spent by Lender
pursuant to the exercise of any Right provided herein shall be payable to Lender
on demand, shall become part of the Obligations, and shall bear interest at a
rate per annum 2% above the Prime Rate on each such amount

                                       29
<PAGE>
         commencing on the date notice of such claims, judgments, costs, charges
         or attorneys' fees is given to Borrower by Lender until the date paid
         by Borrower.

                                  ARTICLE VIII
                                  MISCELLANEOUS

         SECTION 8.1. SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All
representations and warranties of the Borrower made herein, in the other Loan
Papers to which it is a party and in any document, certificate or statement
delivered pursuant hereto or in connection herewith shall survive the execution
and delivery of this Agreement and the Notes.

         SECTION 8.2. COMMUNICATIONS. Unless specifically otherwise provided,
whenever any Loan Paper requires or permits any consent, approval, notice,
request, or demand from one party to another, such communication must be in
writing (which may be by cable, telex, telecopy, fax or other similar means of
remote facsimile transmission) to be effective and shall be deemed to have been
given on the day actually delivered or, if mailed, on the third day (or if such
third day is not a Business Day, then on the next succeeding Business Day) after
it is enclosed in an envelope, addressed to the party to be notified at the
address stated below, properly stamped, sealed, and deposited in the appropriate
official postal service. Until changed by notice pursuant hereto, the address of
each party for purposes of this Agreement is as follows:

<TABLE>
<CAPTION>
<S>                                <C>
                  BORROWER:         Natural Gas Services Group, Inc.
                                    710 Buffalo Street, Suite 201
                                    Corpus Christi, Texas 78401
                                    Attention:  Earl Wait
                                    Facsimile Number for Notice:  (361) 882-5144

                                             or

                  LENDER:           Western National Bank
                                    500 W. Wall, Suite 100
                                    Midland, Texas 79701
                                    Attention:  Scott A. Lovett
                                    Facsimile Number for Notice:  (915) 570-9567
</TABLE>

         SECTION 8.3. BINDING ON SUCCESSORS. All covenants and agreements herein
contained by or on behalf of the Borrower shall bind the Borrower's successors
and assigns and shall inure to the benefit of Lender and its successors and
assigns; provided, however, that Borrower may not assign its Rights or
obligations hereunder without the prior written consent of Lender. If the Lender
sells participations in or assigns the Notes or other Obligations owing to the
Lender to other lenders (which the Lender may undertake to do in its sole
discretion), each of such other lenders shall have the rights to setoff against
such Obligations and similar rights or Liens to the same extent as may be
available to the Lender.

                                       30
<PAGE>

         SECTION 8.4. GOVERNING LAW. THIS AGREEMENT AND THE OTHER LOAN PAPERS
SHALL BE DEEMED TO BE CONTRACTS MADE UNDER, AND SHALL BE CONSTRUED IN ACCORDANCE
WITH, AND GOVERNED BY, THE LAWS OF THE STATE OF TEXAS; PROVIDED, HOWEVER, THAT
THE RIGHTS PROVIDED IN ANY LOAN PAPER WITH REFERENCE TO PROPERTIES COVERED
THEREBY THAT ARE SITUATED IN OTHER STATES MAY BE GOVERNED BY THE LAWS OF SUCH
OTHER STATES, AND PROVIDED, FURTHER, THAT THE LAWS PERTAINING TO THE ALLOWABLE
RATES OF INTEREST MAY, FROM TIME TO TIME, BE GOVERNED BY THE LAWS OF THE UNITED
STATES OF AMERICA.

         SECTION 8.5. USURY SAVINGS CLAUSE. It is the intention of the parties
hereto that Lender shall conform strictly to usury laws applicable to it.
Accordingly, if the transactions contemplated hereby would be usurious as to
Lender under laws applicable to it (including the laws of the United States of
America and the State of Texas or any other jurisdiction whose laws may be
mandatorily applicable to Lender notwithstanding the other provisions hereof),
then, in that event, notwithstanding anything to the contrary in the Notes, this
Agreement or any other Loan Paper or other agreement entered into in connection
with or as security for the Notes, (i) the aggregate of all consideration which
is contracted for, taken, reserved, charged or received by Lender under the
Notes, this Agreement or any other Loan Paper or agreement entered into in
connection with or as security for the Notes shall under no circumstances exceed
the maximum amount allowed by such applicable law, and any excess shall be
credited by Lender on the principal amount of the Obligations to Lender (or, to
the extent that the principal amount of the Obligations shall have been or would
thereby be paid in full, refunded by Lender to the Borrower); and (ii) in the
event that the maturity of the Notes is accelerated by reason of an Event of
Default under this Agreement or otherwise, or in the event of any prepayment,
then such consideration that constitutes interest under law applicable to Lender
may never include more than the maximum amount allowed by such applicable law,
and excess interest, if any, provided for in the Notes, this Agreement or
otherwise shall be cancelled automatically by Lender as of the date of such
acceleration of prepayment and, if theretofore paid, shall be credited by Lender
on the principal amount of the Obligations (or, to the extent that the principal
amount of such Obligations shall have been or would thereby be paid in full,
refunded by Lender to the Borrower).

         To the extent that Texas Finance Code Section 303.201, as supplemented
by Article 5069-ID.002 of the Texas Revised Civil Statutes (Texas Credit Title)
is relevant to Lender for the purposes of determining the Highest Lawful Rate,
the applicable rate ceiling under such provisions shall be determined by the
indicated (weekly) rate ceiling from time to time in effect, subject to Lender's
right subsequently to change such method in accordance with applicable law.
Notwithstanding anything to the contrary contained herein or in any of the other
Loan Papers, it is not the intention of the Lender to accelerate the maturity of
any interest that has not accrued at the time of such acceleration or to collect
unearned interest at the time of such acceleration.

         SECTION 8.6. SEVERABILITY. If one or more of the provisions contained
herein or in the Notes or any of the other Loan Papers shall, for any reason, be
held invalid, illegal or unenforceable in any respect, such invalidity,
illegality or unenforceability shall not affect any other provision of this
Agreement, the Notes or any of the other Loan Papers.

                                       31
<PAGE>

         SECTION 8.7. NON-WAIVER. No Advance hereunder shall constitute a waiver
of the representations, warranties, conditions or agreements of Borrower or of
any of the conditions of Lender's obligations to make further Advances. If
Borrower is unable to satisfy any such representation, warranty, condition or
agreement, no such Advance shall have the effect of precluding Lender from
thereafter declaring such inability to be an Event of Default as hereinabove
provided.

         SECTION 8.8. COUNTERPARTS. This Agreement may be executed by one or
more of the parties to this Agreement on any number of separate counterparts,
each of which shall be deemed to be an original, but all of which taken together
shall constitute one and the same instrument.

         SECTION 8.9. AMENDMENTS AND WAIVERS. Neither this Agreement, the Notes
nor any of the other Loan Papers may be amended or waived orally, but only by an
instrument in writing signed by Borrower and Lender (and/or any other person
which is a party to the Loan Paper being amended or waived).

         SECTION 8.10. TERMS AND HEADINGS. Terms used herein but not defined
shall have the meanings accorded them under generally accepted accounting
principles, or the Texas Uniform Commercial Code, as appropriate. All headings
used herein are for convenience and reference purposes only and shall not affect
the substance of this Agreement.

         SECTION 8.11. CONFLICTS. If there is ever a conflict between any of the
terms, conditions, representations, warranties or covenants contained in this
Agreement and the terms, conditions, representations, warranties or covenants in
any of the other Loan Papers executed by the Borrower, the provisions of this
Agreement shall govern and control; provided, however, the fact that any term,
condition, representation, warranty or covenant contained in such other Loan
Paper is not contained herein shall not be, or be deemed to be, a conflict.

         SECTION 8.12. ENVIRONMENTAL INDEMNITY. Borrower hereby agrees to
defend, indemnify, pay and hold Lender and its officers, directors, employees
and agents (each, an "Indemnitee") harmless from and against, and shall
reimburse each Indemnitee for, any and all loss, claim, liability, damages,
injunctive relief, penalty, judgment, suit, obligation, injury to persons,
property or natural resources, cost, expense or disbursement of any kind or
nature whatsoever including, without limitation, attorneys' fees and costs
attributable to any action or cause of action (whether or not each Indemnitee
shall be designated a party thereto), arising, directly or indirectly, in whole
or in part, out of the release or presence, or alleged release or alleged
presence, or any Hazardous Substance, at, on, or under, surrounding or in
connection with any of the real property owned or leased by Borrower
("Premises"), or any portion thereof, whether foreseeable or unforeseeable,
regardless of the source of such release and regardless of when such release
occurred or such presence is discovered. The foregoing indemnity includes,
without limitation, all cost in law or in equity of removal, remediation of any
kind and disposal of any such Hazardous Substance, all costs of determining
whether the Premises are in compliance, and causing the Premises to be in
compliance, with all Requirements of Law relating to Hazardous Substances, all
costs associated with claims for damages to persons, property or natural
resources, and each Indemnitee's consultants' fees (including attorneys' fees
and costs) and court costs. The obligations of Borrower under this indemnity
shall survive the repayment of the Notes and shall be independent of the
obligations of Borrower to the

                                       32
<PAGE>
Indemnitees in connection with the Notes. The rights of each Indemnitee under
this indemnity shall be in addition to any other rights and remedies of such
Indemnitee under any guaranty or any document or instrument now or hereafter
executed in connection with this Agreement, the Notes, the Loan Papers or at law
or in equity.

         SECTION 8.13. RENEWAL, EXTENSION OR REARRANGEMENT. All provisions of
this Agreement and any of the other Loan Papers relating to the Notes or any
other Obligations shall apply with equal force and effect to each and all
promissory notes hereafter executed which in whole or in part represent a
renewal, extension for any period, increase or rearrangement of any part of the
Obligations originally represented by the Notes or any part of such other
Obligations.

         SECTION 8.14. DIRECT BENEFIT. The loans hereunder and any additional
loans are for the direct benefit of each of the Borrower and its Subsidiaries
and the loans hereunder will be used by them for general working capital
purposes. The Borrower and its Subsidiaries are engaged as an integrated group
in the manufacturing, leasing and financing of industrial equipment and systems
for the oil and gas industry and other industries, and any benefits to the
Borrower or any of its Subsidiaries are a benefit to all of them, both directly
or indirectly, inasmuch as the successful operation and condition of the
Borrower and its Subsidiaries is dependent upon the continued successful
performance of the functions of the integrated group as a whole.

         SECTION 8.15. WAIVERS. No course of dealing on the part of the Lender,
its officers, employees, consultants or agents, nor any failure or delay by the
Lender with respect to exercising any right, power or privilege of the Lender
under this Agreement, the Notes or any other Loan paper shall operate as a
waiver thereof, except as otherwise provided in Section 8.9 hereof.

         SECTION 8.16. CUMULATIVE RIGHTS. Rights and remedies of the Lender
under this Agreement, the Notes and the other Loan Papers shall be cumulative,
and the exercise or partial exercise of any such right or remedy shall not
preclude the exercise of any other right or remedy.

         SECTION 8.17. GOVERNMENTAL REGULATION. Anything contained herein to the
contrary notwithstanding, the Lender shall not be obligated to extend credit to
the Borrower in an amount in violation of any limitation or prohibition provided
by any applicable statute or regulation.

         SECTION 8.18. EXHIBITS. The exhibits, annexes and schedules attached to
this Agreement are incorporated herein and shall be considered a part of this
Agreement for the purposes stated herein, except that in the event of any
conflict between any of the provisions of such exhibits, annexes and schedules
and the provisions of this Agreement, the provisions of this Agreement shall
prevail. All capitalized terms used in such exhibits, annexes and schedules, but
not defined therein, shall have the same meanings as given to such terms in this
Agreement.

         THIS AGREEMENT AND THE OTHER LOAN PAPERS REPRESENT THE ENTIRE AGREEMENT
BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR
CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS BETWEEN THE PARTIES. THERE ARE NO
UNWRITTEN AGREEMENTS BETWEEN THE PARTIES.

                                       33
<PAGE>

         EXECUTED EFFECTIVE as of the date first above written.

                              BORROWER:

                              NATURAL GAS SERVICES GROUP, INC.

                              By: /s/ Burnace J. Boles, Jr.
                                 -------------------------------------------
                                   Burnace J. Boles, Jr., President

                              LENDER:

                              WESTERN NATIONAL BANK

                              By:   /s/ Scott A. Lovett
                                 -------------------------------------------
                                    Scott A. Lovett, Executive Vice President

                                       34
<PAGE>

                                    EXHIBIT A

                              TERM PROMISSORY NOTE

                                       A-1

<PAGE>
                                    EXHIBIT B
$750,000.00                                                   September 15, 1999

                    REVOLVING LINE OF CREDIT PROMISSORY NOTE

                    REVOLVING LINE OF CREDIT PROMISSORY NOTE

FOR VALUE RECEIVED, in the manner, on the dates and in the amounts herein
stipulated, NATURAL GAS SERVICES GROUP, INC., a Texas corporation ("Borrower"),
hereby promises and agrees to pay to the order of WESTERN NATIONAL BANK, a
national banking association ("Lender"), in Midland, Midland County, Texas, the
principal sum of Seven Hundred Fifty Thousand and No/100 Dollars ($750,000.00)
or, if less, the aggregate unpaid principal amount outstanding hereunder, in
lawful money of the United States of America, which shall be legal tender in
payment of all debts and dues, public and private, at the time of payment,
together with interest on the unpaid principal amount hereof from time to time
outstanding until maturity at a rate per annum which shall from day to day be
equal to the lesser of (a) one percent (1.00%) over the Prime Rate (the
"Established Rate") in effect from day to day (calculated on the basis of actual
days elapsed, but computed as if each calendar year consisted of 360 days) or
(b) the Highest Lawful Rate. Each change in the rate of interest charged under
this Revolving Line of Credit Promissory Note (this "Note") shall, subject to
the terms hereof, become effective, without notice to Borrower, upon the
effective date of each change in the Prime Rate or the Highest Lawful Rate, as
the case may be. Notwithstanding the foregoing, if at any time the Established
Rate exceeds the Highest Lawful Rate, the rate of interest on this Note shall be
limited to the Highest Lawful Rate, but any subsequent reductions in the
Established Rate shall not reduce the rate of interest hereon below the Highest
Lawful Rate until the total amount of interest accrued hereon approximately
equals the amount of interest which would have accrued hereon if the Established
Rate had at all times been in effect. In the event that at maturity (stated or
by acceleration), or at final payment of this Note, the total amount of interest
paid or accrued hereon is less than the amount of interest which would have
accrued if the Established Rate had at all times been in effect, then, at such
time and to the extent permitted by applicable laws, Borrower shall pay to
Lender an amount equal to the difference between (a) the lesser of the amount of
interest which would have accrued if the Established Rate had at all times been
in effect or the amount of interest which would have accrued if the Highest
Lawful Rate had at all times been in effect, and (b) the amount of interest
actually paid or accrued on this Note. Interest calculations may be made ten
days prior to any interest installment due date under this Note, in which event,
if there is an adjustment in the interest rate in accordance with the terms
hereof during such ten-day period, then Borrower shall subsequently, on demand,
pay to Lender any underpayment, or Lender shall pay to Borrower, any
overpayment, as the case may be, as a result of any adjustment during such
ten-day period.

                                       B-1

<PAGE>
This Note is the Revolving Line of Credit Promissory Note referred to in the
Loan Agreement, dated as of the date hereof (as the same may be amended,
supplemented or otherwise modified from time to time, the "Loan Agreement"), by
and between Borrower and Lender, and is subject to the terms and conditions
thereof. Reference is made to the Loan Agreement for provisions for the
disbursement of funds hereunder and for a further statement of the rights,
remedies, powers, privileges, benefits, duties and obligations of Borrower and
Lender under the Loan Agreement and this Note. Terms used herein which are
defined in the Loan Agreement shall have such defined meanings unless otherwise
defined herein. The holder of this Note shall be entitled to the benefits of the
Loan Agreement.

Advances and Subsequent Advances under this Note shall be made in accordance
with the provisions of the Loan Agreement. Subject to the terms hereof and of
the Loan Agreement, Borrower may borrow, repay and reborrow at any time and from
time to time under this Note; provided, however, that the principal sum
outstanding hereunder at any one time shall never exceed the lesser of (i)
$750,000.00 or (ii) the Borrowing Base then in effect.

Interest on the outstanding principal balance of this Note shall be due and
payable monthly on the first day of each month, commencing October 15, 1999. The
then outstanding principal balance of this Note and all accrued and unpaid
interest shall be due and payable on September 15, 2001. All of the past due
principal and accrued interest hereunder shall, at the option of Lender, bear
interest from maturity (stated or by acceleration) until paid at a rate per
annum equal to the Highest Lawful Rate.

This Note is secured as provided in the Loan Agreement and in the other Loan
Papers, to which reference is hereby made for a description of the properties
and assets in which a lien and security interest has been granted, the nature
and extent of the security, the terms and conditions upon which the liens and
security interests were granted and the rights of the holder of this Note with
respect thereto.

Time is of the essence of this Note. Upon the occurrence of any one or more of
the Events of Default specified in the Loan Agreement, all amounts then
remaining unpaid on this Note shall become, or may be declared to be,
immediately due and payable, all as provided therein.

Borrower and any and all co-makers, endorsers, guarantors and sureties severally
waive notice (including, but not limited to, notice of protest, notice of
dishonor, notice of intent to accelerate and notice of acceleration), demand,
presentment for payment, protest, diligence in collecting or bringing suit and
the filing of suit for the purpose of fixing liability, and consent that the
time of payment hereof may be extended and re-extended from time to time without
notice to them or any of them, and each agrees that his, her or its liability on
or with respect to this Note shall not be affected, diminished or impaired by
any (a) release of any security at any time existing for this Note, (b)
substitution for any security at any time existing for this Note, or (c) failure
to perfect (or to maintain perfection of) any lien on or security interest in
any such security, in each case in whole or in part, with or without notice,
before or after maturity.
                                       B-2
<PAGE>
It is the intention of Borrower and Lender that Lender shall conform strictly to
usury laws applicable to it. Accordingly, if the transactions contemplated by
the Loan Agreement and this Note would be usurious as to Lender under laws
applicable to it (including the laws of the United States of America and the
State of Texas or any other jurisdiction whose laws may be mandatorily
applicable to Lender notwithstanding the other provisions of the Loan Agreement
and this Note), then, in that event, notwithstanding anything to the contrary in
this Note, the Loan Agreement or any other Loan Paper or other agreement entered
into in connection with or as security for this Note, (i) the aggregate of all
consideration which is contracted for, taken, reserved, charged or received by
Lender under this Note, the Loan Agreement or any other Loan Paper or agreement
entered into in connection with or as security for this Note shall under no
circumstances exceed the maximum amount allowed by such applicable law, and any
excess shall be credited by Lender on the principal amount of the Obligations to
Lender (or, to the extent that the principal amount of the Obligations shall
have been or would thereby be paid in full, refunded by Lender to the Borrower);
and (ii) in the event that the maturity of this Note is accelerated by reason of
an Event of Default under the Loan Agreement or otherwise, or in the event of
any prepayment, then such consideration that constitutes interest under law
applicable to Lender may never include more than the maximum amount allowed by
such applicable law, and excess interest, if any, provided for in this Note, the
Loan Agreement or otherwise shall be cancelled automatically by Lender as of the
date of such acceleration of prepayment and, if theretofore paid, shall be
credited by Lender on the principal amount of the Obligations (or, to the extent
that the principal amount of such Obligations shall have been or would thereby
be paid in full, refunded by Lender to the Borrower).

To the extent that Texas Finance Code Section 303.201, as supplemented by
Article 5069-ID.002 of the Texas Revised Civil Statutes (Texas Credit Title) is
relevant to Lender for the purposes of determining the Highest Lawful Rate, the
applicable rate ceiling under such provisions shall be determined by the
indicated (weekly) rate ceiling from time to time in effect, subject to Lender's
right subsequently to change such method in accordance with applicable law.
Notwithstanding anything to the contrary contained herein or in any of the other
Loan Papers, it is not the intention of the Lender to accelerate the maturity of
any interest that has not accrued at the time of such acceleration or to collect
unearned interest at the time of such acceleration.

This Note is performable and payable in the County of Midland, State of Texas,
and shall be construed in accordance with, and governed by, the laws of the
State of Texas; provided, however, that the laws pertaining to allowable rates
of interest may, from time to time, be governed by the laws of the United States
of America.

                                       NATURAL GAS SERVICES GROUP, INC.

                                       By: /s/ Burnace J. Boles, Jr.
                                           Burnace J. Boles, Jr., President

                                       B-3
<PAGE>

                                    EXHIBIT C

  SUBSEQUENT ADVANCE UNDER REVOLVING LINE OF CREDIT PROMISSORY NOTE - WRITTEN
                              NOTICE OF BORROWING

                                      C-1
<PAGE>

                                    EXHIBIT D

                              BORROWING BASE REPORT

                                       D-1

<PAGE>

                                    EXHIBIT E

                             STOCK PLEDGE AGREEMENTS

                                       E-1

<PAGE>

                                    EXHIBIT F

                   LIMITED LIABILITY COMPANY PLEDGE AGREEMENTS

                                       F-1
<PAGE>

                                    EXHIBIT G

                               SECURITY AGREEMENT

                                       G-1

<PAGE>

                                    EXHIBIT H

                              OFFICER'S CERTIFICATE

                                       H-1
<PAGE>

                                    EXHIBIT I

                               GUARANTY AGREEMENT

                                       I-1
<PAGE>

                                    EXHIBIT J

                           LIMITED GUARANTY AGREEMENT

                                       __-1
<PAGE>

                                    EXHIBIT K

                             COMPLIANCE CERTIFICATE

                                       K-1
<PAGE>

                                    EXHIBIT L

                           CONSOLIDATED CURRENT RATIO

                                       L-1
<PAGE>

                                    EXHIBIT M

                         CONSOLIDATED TANGIBLE NET WORTH

                                       M-1
<PAGE>

                                    EXHIBIT N

                               DEBT SERVICE RATIO

                                       N-1

<PAGE>

                                    EXHIBIT O

                         CONSOLIDATED TANGIBLE NET WORTH

                                       O-1
<PAGE>

                                   SCHEDULE I

 JURISDICTION OF ORGANIZATION AND EACH OTHER JURISDICTION IN WHICH THE BORROWER
               AND ITS SUBSIDIARIES ARE QUALIFIED TO DO BUSINESS

                                 Schedule I - 1
<PAGE>

                                   SCHEDULE II

           TERM PROMISSORY NOTE, FOR THE REPAYMENT OF THE INDEBTEDNESS

<PAGE>
                              TERM PROMISSORY NOTE

$1,500,000.00                                                 September 15, 1999

FOR VALUE RECEIVED, in the manner, on the dates and in the amounts herein
stipulated, NATURAL GAS SERVICES GROUP, INC., a Texas corporation ("Borrower"),
hereby promises and agrees to pay to the order of WESTERN NATIONAL BANK, a
national banking association ("Lender"), in Midland, Midland County, Texas, the
principal sum of One Million Five Hundred Thousand and No/100 Dollars
($,1,500,000.00) in lawful money of the United States of America, which shall be
legal tender in payment of all debts and dues, public and private, at the time
of payment, together with interest on the unpaid principal amount hereof from
time to time outstanding until maturity at a rate per annum which shall from day
to day be equal to the lesser of (a) one percent (1.00%) over the Prime Rate
(the "Established Rate") in effect from day to day (calculated on the basis of
actual days elapsed, but computed as if each calendar year consisted of 360
days) or (b) the Highest Lawful Rate. Each change in the rate of interest
charged under this Term Promissory Note (this "Note") shall, subject to the
terms hereof, become effective, without notice to Borrower, upon the effective
date of each change in the Prime Rate or the Highest Lawful Rate, as the case
may be. Notwithstanding the foregoing, if at any time the Established Rate
exceeds the Highest Lawful Rate, the rate of interest on this Note shall be
limited to the Highest Lawful Rate, but any subsequent reductions in the
Established Rate shall not reduce the rate of interest hereon below the Highest
Lawful Rate until the total amount of interest accrued hereon approximately
equals the amount of interest which would have accrued hereon if the Established
Rate had at all times been in effect. In the event that at maturity (stated or
by acceleration), or at final payment of this Note, the total amount of interest
paid or accrued hereon is less than the amount of interest which would have
accrued if the Established Rate had at all times been in effect, then, at such
time and to the extent permitted by applicable laws, Borrower shall pay to
Lender an amount equal to the difference between (a) the lesser of the amount of
interest which would have accrued if the Established Rate had at all times been
in effect or the amount of interest which would have accrued if the Highest
Lawful Rate had at all times been in effect, and (b) the amount of interest
actually paid or accrued on this Note. Interest calculations may be made ten
days prior to any interest installment due date under this Note, in which event,
if there is an adjustment in the interest rate in accordance with the terms
hereof during such ten-day period, then Borrower shall subsequently, on demand,
pay to Lender any underpayment, or Lender shall pay to Borrower, any
overpayment, as the case may be, as a result of any adjustment during such
ten-day period.

This Note is the Term Promissory Note referred to in the Loan Agreement, dated
as of the date hereof (as the same may be amended, supplemented or otherwise
modified from time to time, the "Loan Agreement"), by and between Borrower and
Lender, and is subject to the terms and conditions thereof. Reference is made to
the Loan Agreement for provisions for the disbursement of funds hereunder and
for a further statement of the rights, remedies, powers, privileges, benefits,
duties and obligations of Borrower and Lender under the Loan Agreement and this
Note. Terms used herein which are defined in the Loan Agreement shall have such
defined meanings unless otherwise defined herein. The holder of this Note shall
be entitled to the benefits of the Loan Agreement.

                                 Schedule II-1

<PAGE>

Interest only on this Note shall be due and payable on October 15, 1999,
November 15, 1999 and December 15, 1999. Thereafter, the principal of this Note
shall be due and payable (a) in fifty-nine consecutive monthly installments of
$25,000.00 each, with the first such installment being due and payable on
January 15, 2000, and a like installment being due and payable on the first day
of each succeeding month to and including November 15, 2004; and (b) one final
installment in an amount equal to all remaining unpaid principal and accrued and
unpaid interest on this Note shall be due and payable on December 15, 2004.
Interest, computed on the unpaid balance of this Note, shall be due and payable
as it accrues, on the same dates as, but in addition to, the installments of
principal. All payments and prepayments shall be applied first to accrued and
unpaid interest, and the balance to principal. Partial prepayments of principal
shall be applied to the installments of principal thereof in the inverse order
of their maturity. All of the past due principal and accrued interest hereunder
shall, at the option of Lender, bear interest from maturity (stated or by
acceleration) until paid at a rate per annum equal to the Highest Lawful Rate.

This Note is secured as provided in the Loan Agreement and in the other Loan
Papers, to which reference is hereby made for a description of the properties
and assets in which a lien and security interest has been granted, the nature
and extent of the security, the terms and conditions upon which the liens and
security interests were granted and the rights of the holder of this Note with
respect thereto.

Time is of the essence of this Note. Upon the occurrence of any one or more of
the Events of Default specified in the Loan Agreement, all amounts then
remaining unpaid on this Note shall become, or may be declared to be,
immediately due and payable, all as provided therein.

Borrower and any and all co-makers, endorsers, guarantors and sureties severally
waive notice (including, but not limited to, notice of protest, notice of
dishonor, notice of intent to accelerate and notice of acceleration), demand,
presentment for payment, protest, diligence in collecting or bringing suit and
the filing of suit for the purpose of fixing liability, and consent that the
time of payment hereof may be extended and re-extended from time to time without
notice to them or any of them, and each agrees that his, her or its liability on
or with respect to this Note shall not be affected, diminished or impaired by
any (a) release of any security at any time existing for this Note, (b)
substitution for any security at any time existing for this Note, or (c) failure
to perfect (or to maintain perfection of) any lien on or security interest in
any such security, in each case in whole or in part, with or without notice,
before or after maturity.

It is the intention of Borrower and Lender that Lender shall conform strictly to
usury laws applicable to it. Accordingly, if the transactions contemplated by
the Loan Agreement and this Note would be usurious as to Lender under laws
applicable to it (including the laws of the United States of America and the
State of Texas or any other jurisdiction whose laws may be mandatorily
applicable to Lender notwithstanding the other provisions of the Loan Agreement
and this Note), then, in that event, notwithstanding anything to the contrary in
this Note, the Loan Agreement or any other Loan Paper or other agreement entered
into in connection with or as security for this Note, (i) the aggregate of all
consideration which is contracted for, taken, reserved, charged or received by
Lender under this Note, the Loan Agreement or any other Loan Paper or agreement
entered into in connection with or as security for this Note shall under no
circumstances exceed the maximum amount allowed by such applicable law, and any
excess

                                 Schedule II-2
<PAGE>
shall be credited by Lender on the principal amount of the Obligations to Lender
(or, to the extent that the principal amount of the Obligations shall have been
or would thereby be paid in full, refunded by Lender to the Borrower); and (ii)
in the event that the maturity of this Note is accelerated by reason of an Event
of Default under the Loan Agreement or otherwise, or in the event of any
prepayment, then such consideration that constitutes interest under law
applicable to Lender may never include more than the maximum amount allowed by
such applicable law, and excess interest, if any, provided for in this Note, the
Loan Agreement or otherwise shall be cancelled automatically by Lender as of the
date of such acceleration of prepayment and, if theretofore paid, shall be
credited by Lender on the principal amount of the Obligations (or, to the extent
that the principal amount of such Obligations shall have been or would thereby
be paid in full, refunded by Lender to the Borrower).

To the extent that Texas Finance Code Section 303.201, as supplemented by
Article 5069-ID.002 of the Texas Revised Civil Statutes (Texas Credit Title) is
relevant to Lender for the purposes of determining the Highest Lawful Rate, the
applicable rate ceiling under such provisions shall be determined by the
indicated (weekly) rate ceiling from time to time in effect, subject to Lender's
right subsequently to change such method in accordance with applicable law.
Notwithstanding anything to the contrary contained herein or in any of the other
Loan Papers, it is not the intention of the Lender to accelerate the maturity of
any interest that has not accrued at the time of such acceleration or to collect
unearned interest at the time of such acceleration.

This Note is performable and payable in the County of Midland, State of Texas,
and shall be construed in accordance with, and governed by, the laws of the
State of Texas; provided, however, that the laws pertaining to allowable rates
of interest may, from time to time, be governed by the laws of the United States
of America.

                                                NATURAL GAS SERVICES GROUP, INC.

                                                By:/s/ Burnace J. Boles, Jr.
                                                --------------------------------
                                                Burnace J. Boles, Jr., President

                                 Schedule II-3

<PAGE>
                  FIRST AMENDMENT AND WAIVER TO LOAN AGREEMENT

         THIS FIRST AMENDMENT AND WAIVER TO LOAN AGREEMENT (this "Amendment"),
dated as of March 9, 2001, is made and entered into by and between Natural Gas
Services Group, Inc., a Colorado corporation ("Borrower"), Wallace C. Sparkman,
Wallace O. Sellers, CAV-RDV, LTD., Diamente Investments, L.P., Rotary Gas
Systems, Inc., NGE Leasing, Inc. and Western National Bank, a national banking
association ("Lender").

                              W I T N E S S E T H :

         WHEREAS, Borrower and Lender entered into that certain Loan Agreement,
dated as of September 15, 1999 (the "Agreement"), providing for, among other
things, loans to Borrower evidenced by (i) that certain Revolving Line of Credit
Promissory Note, dated September 15, 1999, in the original principal amount of
Seven Hundred Fifty Thousand and No/100 Dollars ($750,000.00), executed by
Borrower and payable to the order of Lender in accordance with the terms set
forth therein; and (ii) that certain Term Promissory Note, dated September 15,
1999, in the original principal amount of One Million Five Hundred Thousand and
No/100 Dollars ($1,500,000.00), executed by Borrower and payable to the order of
Lender in accordance with the terms set forth therein;

         WHEREAS, Borrower has requested that Lender provide additional loans to
Borrower in an aggregate amount not to exceed Seven Hundred Thousand and No/100
Dollars ($700,000.00);

         WHEREAS, Borrower has sold, and is no longer the owner of, all of the
issued and outstanding shares of capital stock of C.N.G. Engines Company;

         WHEREAS, Hi-Tech Compressor Company, L.C. changed its name to Rotary
Gas Systems, L.C.;

         WHEREAS, Borrower conveyed all of its ownership interest in Rotary Gas
Systems, L.C. to Flare King, Inc.;

         WHEREAS, Rotary Gas Systems, L.C. conveyed all of its assets to Flare
King, Inc. and Rotary Gas Systems, L.C. thereafter dissolved;

         WHEREAS, Flare King, Inc. changed its name to Rotary Gas Systems, Inc.;

         WHEREAS, NGE Leasing, Inc., a Texas corporation and wholly owned
subsidiary of Borrower, proposes to issue and sell its Series A 10% Subordinated
Notes due December 31, 2005 in the maximum aggregate principal amount of
$3,500,000.00 (the "Subordinated Notes");

         WHEREAS, the Borrower desires to provide credit support for the
Subordinated Notes in the form of Borrower's guaranty of payment of the
Subordinated Notes;

         WHEREAS, Natural Gas Acquisition Corporation, a Colorado corporation
and wholly owned subsidiary of the Borrower, proposes to enter into an Asset
Purchase Agreement, effective as of January 1, 2001, with Great Lakes
Compression, Inc. pursuant to which Natural

                                Schedule II - 1
<PAGE>
Gas Acquisition Corporation will purchase the natural gas compression business
of Great Lakes Compression, Inc. for the aggregate purchase price of
$8,000,000.00 (the "Acquisition");

         WHEREAS, Borrower desires to amend the Agreement to provide for such
additional loans to the Borrower and the other matters set forth herein;

         WHEREAS, the Lender is agreeable to the Borrower's requests but only
upon and subject to the terms and provisions which are hereinafter specified.

         NOW THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements herein contained, and intending to be legally bound
hereby, the parties hereto hereby agree as follows:

                                   ARTICLE I
                                 DEFINED TERMS.

         In addition to the terms defined in this Amendment, all terms defined
in the Agreement, and not otherwise defined herein, shall have the meaning given
them in the Agreement when used herein.

                                   ARTICLE II
                         AMENDMENTS TO LOAN AGREEMENT.

SECTION 2.1. AMENDMENT TO DEFINITIONS.

                  (a) The definitions of "Guarantors" and "Notes" contained in
         Section 1.1 of the Agreement are amended to read as follows:

                  "Guarantors" means (i) the Subsidiaries identified in Section
                  4.18 of this Agreement (excluding Hy-Bon Rotary Compression,
                  LLC and Natural Gas Acquisition Corporation), (ii) Wallace O.
                  Sellers, (iii) Cav-RDV, LTD., (iv) Wallace C. Sparkman, and
                  (v) Diamente Investments, L.P.

                  "Notes" means the Term A Promissory Note, the Term B
                  Promissory Note and the Revolving Line of Credit Promissory
                  Note, as further described in Section 2.1 of this Agreement.

                  (b) Section 1.1 of the Agreement is further amended by adding
         a new definition of "Subordinated Notes" immediately after the defined
         term "Rights", and which reads in full as follows:

                  "Subordinated Notes" means the Series A 10% Subordinated Notes
                  due December 31, 2006 in the maximum aggregate principal
                  amount of $3,500,000.00 issued by NGE Leasing, Inc.

                                Schedule II - 2
<PAGE>
         SECTION 2.2. TERM LOANS. Each reference to "Term Promissory Note" in
Section 2.1(a) of the Agreement is amended to read "Term A Promissory Note".

         Section 2.1(a) of the Agreement is further amended by adding a new
paragraph immediately following the first paragraph which new paragraph reads in
full as follows:

                  The Borrower shall execute and deliver to the Lender the Term
                  B Promissory Note in the form of Exhibit A-1 hereto in the
                  original principal amount of $700,000.00 (the "Term B
                  Promissory Note").

                  Subject to arid upon the terms and conditions of this
                  Agreement, the entire amount of the Term B Promissory Note
                  will be funded in a single Advance. The Term B Promissory Note
                  shall be stated to mature five years from the date of such
                  note and shall bear interest on the unpaid principal amount
                  thereof from time to time outstanding at the applicable
                  interest rate per annum as provided in the Term B Promissory
                  Note. Principal and interest on the Term B Promissory Note
                  shall be payable in the manner and on the dates specified
                  therein,

         SECTION 2.3. ORDER OF APPLICATION. Section 2.6 of the Agreement is
amended to read in full as follows:

                  2.6 Order of Application. Except as otherwise provided in the
                  Loan Papers, all payments and prepayments on the obligations,
                  including proceeds from the exercise of any Rights of Lender
                  under the Loan Papers, shall be applied to the Obligations in
                  the following order: (i) first, to reasonable expenses for
                  which Lender shall not have been reimbursed under the Loan
                  Papers and then to all amounts to which Lender is entitled to
                  indemnification under the Loan Papers; (ii) to the accrued
                  interest on the Note being paid or prepaid; (iii) to the
                  principal of the Note being paid or prepaid and, with regard
                  to the Term A Promissory Note and the Term B Promissory Note,
                  applied upon installments of most remote maturity; and (iv) to
                  the remaining Obligations.

         SECTION 2.4. INITIAL ADVANCES. Section 3.1(a) of the Agreement is
amended (i) to delete the word "either" in the second line of Section 3.1(a) and
replace such word with the word "any", and (ii) to delete the phrase "the Term
Promissory Note" appearing in Section 3.1(a)(2) and substituting in place
thereof "the Term A Promissory Note and the Term B Promissory Note".

         SECTION 2.5. PURPOSE OF LOAN. Section 4.11(a) of the Agreement is
amended to read in full as follows:

                  (a) with respect to loans made pursuant to and evidenced by
                  the Term A Promissory Note, for the repayment of the
                  indebtedness described on Schedule 11 hereto, and with respect
                  to

                                 Schedule II - 3
<PAGE>
                  loans made pursuant to and evidenced by the Term B Promissory
                  Note, for repaying $700,000.00 of the aggregate outstanding
                  principal and accrued and unpaid interest on the Revolving
                  Line of Credit Promissory Note.

         SECTION 2.6. SUBSIDIARIES. Section 4.18 of the Agreement is amended to
read in full as follows:

                  4.18 Subsidiaries. The following constitute all the
                  Subsidiaries of the Borrower at the date hereof:

                           Rotary Gas Systems, Inc. (formerly, Flare King,
                           Inc.), NGE Leasing, Inc., Natural Gas Acquisition
                           Corporation, and Hy-Bon Rotary Compression, LLC

                  Each such Subsidiary is wholly-owned by the Borrower, except
                  that Hy-Bon Rotary Compression, LLC is owned 50% by Borrower.

         SECTION 2.7. ADDITIONAL REPORTING REQUIREMENT. Section 5.1 of the
Agreement is amended to add a new subparagraph (k) which reads in full as
follows:

                  (k) as soon as available, but in any event not later than 30
                  days after the end of each month, a report, in detail
                  reasonably satisfactory to Lender, (i) setting forth, by
                  owner, the unit number, serial number or other identifying
                  number of each gas compressor owned by the Borrower and its
                  Subsidiaries, (ii) stating whether or not each compressor
                  identified in the report has been leased or rented to any
                  person and, if so, a brief description of the lease,
                  including, without limitation, the date of the lease and the
                  name of the lessee, (iii) describing the specific location of
                  each gas compressor, (iv) attaching copies of any lease or
                  rental agreement entered into during the prior month and (v)
                  including such other information as Lender shall reasonably
                  require.

         SECTION 2.8. INSURANCE. The last sentence of Section 5.4 of the
Agreement is amended to read in full as follows:

                  In the case of any fire, accident or other casualty causing
                  loss or damage to any property of Borrower, the proceeds of
                  such policies in excess of $50,000.00 shall, at Borrower's
                  option, be used to (i) replace the lost or damaged property
                  with similar property having a value at least equivalent to
                  the lost or damaged property, or (ii) prepay the Term A
                  Promissory Note, the Term B Promissory Note and the Revolving
                  Line of Credit Promissory Note, in that order.

                                 Schedule II - 4
<PAGE>
         SECTION 2.9. SUBORDINATED NOTES. There is added to the Agreement a new
Section 5.12 which reads in its entirety as follows:

                           5.12 Subordination of Subordinated Notes. Subject to
                  Section 6.15 hereof, the indebtedness of NGE Leasing, Inc.
                  evidenced by the Subordinated Notes and any guarantee thereof
                  by the Borrower and any and all renewals, extensions,
                  refundings and modifications (but not increases) thereto are
                  hereby subordinated and subject in right of payment and in all
                  other respects to the prior payment in full of (a) all Debt of
                  the Borrower and any Subsidiary to the Lender, (b) any other
                  indebtedness, liability or obligation, contingent or
                  otherwise, of Borrower or any Subsidiary or Guarantor to
                  lender, and any guaranty, endorsement or other contingent
                  obligation in respect thereof, whether outstanding on the date
                  hereof or hereafter created, incurred or assumed, and (c)
                  modifications, renewals, extensions, increases, rearrangements
                  and refundings of any such indebtedness, liabilities or
                  obligations.

         SECTION 2.10. FINANCIAL RATIO. Section 6.1(d) of the Agreement is
amended to read in full as follows:

                  (d) Consolidated Debt to Consolidated Tangible Net Worth
                  Ratio. Permit the ratio of (i) Consolidated Debt to (ii)
                  Consolidated Tangible Net Worth, as such terms are defined
                  herein and calculated pursuant to Exhibit O hereof, to be more
                  than 2.00 to 1.00 as of the end of each month through and
                  including March 31, 2001, or less than 2.75 to 1.00 as of the
                  end of each month after March 31, 2001.

         SECTION 2.11. DEBT. Section 6.2(b) of the Agreement is amended to read
in full as follows:

                  (b) Debt existing on the date of this Agreement which is set
                  forth in the financial statements referred to in Section 4.5
                  of this Agreement (excluding, however, the Debt described in
                  Schedule II hereto which shall be repaid in its entirety on
                  the day the initial Advance is made to Borrower under the Term
                  A Promissory Note), but not any increases thereof;

         SECTION 2.12. NEW COVENANT. There is added to the Agreement a new
Section 6.15 which reads in its entirety as follows:

                  (b) Notwithstanding anything in the Subordinated Notes or any
                  other instrument or agreement evidencing or pertaining to the
                  Subordinated Notes to the contrary, make any payment of
                  principal or interest on the Subordinated Notes, unless:

                                 Schedule II - 5
<PAGE>
                           (i) there is not in existence, at the time of the
                  principal or interest payment to be made, an "Event of
                  Default" as defined in Section 7.1 of this Agreement; and

                           (ii) the principal or interest payment to be made
                  would not cause or result in the occurrence of an "Event of
                  Default" as defined in Section 7.1 of this Agreement.

         SECTION 2.13. SCHEDULE II. The introductory line of Schedule II is
amended to read in full as follows:

                  The following indebtedness of the Borrower will be repaid in
                  its entirety with proceeds of the Term A Promissory Note.

         SECTION 2.14. DEFAULTS. Section 7.1 of the Agreement is amended by
adding a new subparagraph (k) and a new subparagraph (1) immediately after
subparagraph (j) and which new paragraphs read in full as follows:

                           (k) Borrower or any Subsidiary defaults in the
                  payment when due of any installment of principal or interest
                  on the Subordinated Notes.

                           (1) the occurrence of an "Event of Default" within
                  the meaning of that certain Asset Purchase Agreement,
                  effective as of January 1, 2001, between Natural Gas
                  Acquisition Corporation and Great Lakes Compression, Inc.

         SECTION 2.15. NOTE REFERENCES. All references to "Term Promissory Note"
appearing in the Term Promissory Note, dated September 15, 1999, in the original
principal amount of $1,500,000.00 made by Borrower payable to the order of
Lender shall be deemed to be references to the Term A Promissory Note.

         SECTION 2.16. NEW EXHIBIT. There is added to the Agreement a new
Exhibit A-1 which is identical to Exhibit A-I attached to this Amendment.

                                  ARTICLE III
                                REVOLVING LOANS.

         Borrower's repayment of all outstanding principal and accrued and
unpaid interest on the Revolving Line of Credit Promissory Note shall not be in
extinguishment or termination of the Revolving Line of Credit Promissory Note,
and Borrower may continue to borrow, prepay and reborrow under such note in
accordance with and subject to the terms and conditions of the Agreement and
such Revolving Line of Credit Promissory Note.

                                 Schedule II - 6
<PAGE>
                                   ARTICLE IV
                                    WAIVERS.

         (a) The Lender hereby waives compliance with Section 6.2, 6.12, 6.13
and 6.14(i) of the Agreement, but solely with respect to Natural Gas Acquisition
Corporation and only to the extent necessary to permit the execution, delivery
and performance by Natural Gas Acquisition Corporation (as buyer) of the Asset
Purchase Agreement, effective as of January 1, 2001, with Great Lakes
Compression, Inc. and being in the form submitted by Borrower to the Lender.

         (b) The Lender hereby waives compliance with Section 6.8 of the
Agreement, but solely with respect to Natural Gas Acquisition Corporation and
only to the extent necessary to permit the execution, delivery and performance
by Natural Gas Acquisition corporation (as mortgagor) of the Continuing
Collateral Mortgage, made and delivered in connection with the Asset Purchase
Agreement referred to in subparagraph (a) of this Section 4, to and in favor of
Great Lakes Compression, Inc. and being in the form submitted by Borrower to the
Lender.

         (c) The Lender hereby waives compliance with Section 6.8, of the
Agreement, but solely with respect to Natural Gas Acquisition Corporation and
only to the extent necessary to permit the execution, delivery and performance
by Natural Gas Acquisition Corporation (as buyer) of the Security Agreement,
made and delivered in connection with the Asset Purchase Agreement referred to
in subparagraph (a) of this Section 4, to and in favor of Great Lakes
Compression, Inc., and being in the form submitted by Borrower to the Lender.

         (d) The Lender hereby waives compliance with Section 6.8 of the
Agreement, but solely with respect to Natural Gas Services Group, Inc. and only
to the extent necessary to permit the execution, delivery and performance by
Natural Gas Services Group, Inc. (as pledgor) of the Stock Pledge Agreement,
made and delivered in connection with the Asset Purchase Agreement referred to
in subparagraph (a) of this Section 4, to and in favor of Great Lakes
Compression, Inc. and being in the form submitted by Borrower to the Lender.

         (e) The Lender hereby waives compliance with Section 6.2 of the
Agreement, but solely with respect to Natural Gas Services Group, Inc. and only
to the extent necessary to permit the execution, delivery and performance by
Natural Gas Services Group, Inc. (as guarantor) of the Limited Recourse Guaranty
Agreement made and delivered in connection with the Asset Purchase Agreement
referred to in subparagraph (a) of this Section 4, to and in favor of Great
Lakes Compression, Inc. and being in the form submitted by Borrower to the
Lender.

         (f) The Lender hereby waives compliance with Section 6.2, of the
Agreement, but solely with respect to NGE Leasing, Inc. and only to the extent
necessary to permit the execution, issuance and delivery by NGE Leasing, Inc.
(as issuer) of the Subordinated Notes and being in the form submitted by
Borrower to the Lender.

         Except as to the specific parties and the specific documents referenced
above and except as expressly waived herein, the Agreement shall continue to be,
and shall remain, in full force and effect. This waiver shall not be deemed to
be a waiver of, or consent to, or a modification or amendment of, any other term
or condition of the Agreement or to prejudice any other right or rights which
the Lender may now have or may have in the future under or in connection with
the

                                 Schedule II - 7
<PAGE>
Agreement or any of the instruments or agreements referred to therein, as the
same may be amended from time to time.

         Notwithstanding the waiver by the Lender of the matters set forth
above, the waiver of the Lender herein shall be ineffectual and of no force and
effect to the extent that (i) there are any material changes, alterations or
additions in or to the terms of the agreements described in subparagraphs (a)
through (f) above in the form delivered to the Lender and which changes,
alterations or additions are not disclosed to and approved by the Lender prior
to the effectiveness of any such changes, alteration or addition or (ii)
Borrower omitted to disclose to the Lender or incorrectly described a material
term, provision or element of any such agreement or the Acquisition necessary in
order to make the descriptions of the Acquisition not misleading to the Lender.

                                   ARTICLE V
                        REPRESENTATIONS AND WARRANTIES.

         To induce Lender to enter into this Amendment, Borrower hereby
represents and warrants to the Lender as follows:

         (a) Borrower has the corporate power, authority and legal right to make
and deliver this Amendment and to perform its obligations under the Agreement as
amended hereby and has taken all action necessary to authorize the execution and
delivery of this Amendment and the performance of the Agreement as amended
hereby.

         (b) This Amendment has been duly executed and delivered on behalf of
Borrower by its duly authorized officer, and this Amendment constitutes a legal,
valid and binding obligation of Borrower, enforceable in accordance with its
terms, except as the enforceability thereof may be limited by applicable
bankruptcy, reorganization, insolvency, moratorium or other laws affecting
creditors' rights generally and by general equitable principles (whether
enforcement is sought by proceedings in equity or at law).

         (c) The proceeds of the loans to be made to Borrower on the date hereof
shall be used by Borrower to repay and refinance all amounts outstanding under
the Revolving Line of Credit Promissory Note.

         (d) The execution, delivery and performance by Borrower of this
Amendment do not violate or constitute a default under any provision of
applicable law or any agreement binding upon Borrower or the Subsidiaries of
Borrower or result in the creation or imposition of any Lien upon any of the
assets of Borrower or the Subsidiaries of Borrower, except Liens expressly
permitted by the Agreement.

         (e) The representations and warranties contained in Article IV of the
Agreement, as amended hereby, are true and correct on and as of the date hereof
as though made on and as of the date hereof.

         (f) No Event of Default has occurred and is continuing (before and
after giving effect to this Amendment.

                                 Schedule II - 8
<PAGE>
         (g) The Subordinated Notes are subordinated in right of payment and in
all other respects to the Debt of Borrower to the Lender.

         (h) The Borrower has provided to the Lender true, accurate and complete
copies of all documents, instruments, certificates and agreements in the form to
be executed by the Borrower and Natural Gas Acquisition Corporation in
connection with the Acquisition, and none of such documents, instruments,
certificates or agreements have been amended, modified, supplemented or
otherwise altered in any material respect.

                                   ARTICLE VI
                      RATIFICATION OF SECURITY DOCUMENTS.

         Borrower and each Subsidiary hereby ratify and confirm in all respects
each (i) Stock Pledge Agreement (other than the Stock Pledge Agreement, dated as
of September 15, 1999, executed by the Borrower pledging to the Lender the stock
of C.N.G. Engines Company), and (ii) Security Agreement, in each case dated as
of September 15, 1999 (as any of the same have been amended and restated in
connection with this Amendment), to which it is a party and acknowledge that
payment of the Term B Promissory Note is secured by all such agreements. The
amendments contemplated hereby shall not limit or impair any Bank Liens securing
the Obligations, each of which are hereby ratified, affirmed and extended to
secure the obligations as increased pursuant hereto.

                                  ARTICLE VII
                             ADDITIONAL COLLATERAL.

         Not later than ninety days after the date of this Amendment, Borrower
will cause Hy-Bon Rotary Compression, LLC to grant to the Lender as additional
security for Borrower's Debt to Lender a first and prior Bank Lien on the
accounts, contracts and documents, including, without limitation, lease or
rental agreements, in each case entered into or held by Hy-Bon Rotary
Compression, LLC on behalf of or for the benefit of Borrower or any Subsidiary
or which are otherwise allocable or attributable solely to the membership
interest of Borrower or any Subsidiary in Hy-Bon Rotary Compression, LLC and
which Bank Lien will be created and perfected by and in accordance with the
provisions of security agreements and financing statements, or other security
instruments, all in form and substance satisfactory to the Lender in its sole
discretion and in sufficient executed (and acknowledged, where necessary or
appropriate) counterparts for recording purposes.

                                  ARTICLE VIII
                             CONDITIONS PRECEDENT.

         This Amendment, and the Lender's commitment to make additional loans to
the Borrower evidenced by the Term B Promissory Note, shall be effective only
upon satisfaction of the following conditions precedent:

         (a) Lender shall have received counterparts of this Amendment duly
executed and delivered by Borrower and Guarantors;

                                 Schedule II - 9
<PAGE>
         (b) Lender shall have received the Term B Promissory Note in the form
of Exhibit A-1 hereto, executed and delivered by a duly authorized officer of
Borrower;

         (c) Lender shall have received from each Guarantor a Guaranty Agreement
in form and substance satisfactory to Lender in its sole discretion;

         (d) Lender shall have received from each of Rotary Gas Systems, Inc.,
NGE Leasing, Inc. and Borrower, a First Amended and Restated Security Agreement
inform and substance satisfactory to Lender in its sole discretion;

         (e) Lender shall have received from Borrower a First Amended and
Restated Stock Pledge Agreement in form and substance satisfactory to Lender in
its sole discretion;

         (f) no Event of Default shall have occurred and be continuing as of the
date of this Amendment, both before and after giving effect to this Amendment;

         (g) Lender shall have received a copy of the resolutions, in form and
substance satisfactory to Lender, of the Board of Directors of Borrower
authorizing (i) the execution, delivery and performance of this Amendment, the
First Amended and Restated Stock Pledge Agreement and the other documents to be
entered into in connection herewith to which it is a party, (ii) the borrowings
contemplated hereby and (iii) the ratification by it of the pledge and grant of
security interests in the assets of the Borrower, certified by its Secretary or
Assistant Secretary as of the date hereof, which certificate shall state that
the resolutions thereby certified have not been amended, modified, revoked or
rescinded as of the date of such certificate and shall be in form and substance
satisfactory to Lender;

         (h) Lender shall have received a copy of the resolutions, in form and
substance satisfactory to Lender, of the Board of Directors of Rotary Gas
Systems, Inc. authorizing the execution, delivery and performance of this
Amendment, its Guaranty, First Amended and Restated Security Agreement and the
other documents to be entered into in connection herewith to which it is a
party, certified by its Secretary or Assistant Secretary as of the date hereof,
which certificate shall state that the resolutions thereby certified have not
been amended, modified, revoked or rescinded as of the date of such certificate
and shall be in form and substance satisfactory to Lender;

         (i) Lender shall have received a copy of the resolutions, in form and
substance satisfactory to Lender, of the Board of Directors of NGE Leasing, Inc.
authorizing (i) the execution, delivery and performance of this Amendment, its
Guaranty and the other documents to be entered into in connection herewith to
which it is a party, and (ii) the ratification by it of the pledge and grant of
security interests in the assets of NGE Leasing, Inc., certified by its
Secretary or Assistant Secretary as of the date hereof, which certificate shall
state that the resolutions thereby certified have not been amended, modified,
revoked or rescinded as of the date of such certificate and shall be in form and
substance satisfactory to Lender;

         (j) Lender shall have received a copy of the resolutions, in form and
substance satisfactory to Lender, of the Board of Directors, General Partner or
other governing bodies of each of Diamente Investments, L.P. and CAV-RDV, LTD.,
authorizing the execution, delivery and performance of this Amendment, its
respective Guaranty and the other documents to be

                                Schedule II - 10
<PAGE>
entered into in connection herewith to which it is a party and certified by its
Secretary or Assistant Secretary as of the date hereof, which certificate shall
state that the resolutions thereby certified have not been amended, modified,
revoked or rescinded as of the date of such certificate and shall be in form and
substance satisfactory to Lender; and

         (k) Lender shall have received such other agreements, documents or
instruments as Lender may require.

                                   ARTICLE IX
                NO OTHER AMENDMENTS; RATIFICATION OF AGREEMENT.

         Except as expressly amended and modified by this Amendment, all of the
provisions and covenants of the Agreement, all exhibits thereto and all other
Loan Papers are and shall continue to remain in full force and effect in
accordance with the terms thereof and are hereby ratified and confirmed by
Borrower, the Subsidiaries and Guarantors as of the date of this Amendment as if
the Agreement and such other Loan Papers were reexecuted as of the date of this
Amendment.

                                   ARTICLE X
                           NO ADDITIONAL COMMITMENTS.

         Borrower and Guarantors understand, acknowledge and agree that Lender
has not made any commitments, and has no obligation, to renew, extend,
refinance, increase or otherwise modify any of the Notes after the respective
maturity date of each such Note.

                                   ARTICLE XI
                                 COUNTERPARTS.

         This Amendment may be executed by one or more of the parties hereto in
any number of separate counterparts and all of said counterparts taken together
shall be deemed to constitute one and the same instrument.

                                  ARTICLE XII
                                 GOVERNING LAW.

         THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS.

                                  ARTICLE XIII
                        GLOBAL AMENDMENT OF LOAN PAPERS.

         All of the Loan Papers are hereby modified wherever necessary, and even
though not specifically addressed herein, so as to conform to the amendments to
the Agreement as set forth herein, and Borrower, the Subsidiaries and Guarantors
covenant to observe, comply with and perform each of the terms and provisions of
the Loan Papers to which they are parties, as modified hereby. Each Loan Paper
to which Borrower and the Subsidiaries or any Guarantor is a party is hereby
amended so that any reference in each such Loan Paper to the Agreement shall
mean a reference to the Agreement as amended hereby.

                                Schedule II - 11
<PAGE>
                                  ARTICLE XIV
                                    RELEASE.

         The Borrower and Guarantors hereby release the Lender and its officers,
directors, shareholders, agents, employees, attorneys, agents and
representatives (collectively, the "Released Parties") from any and all (i)
damages, claims, liabilities, causes of action, contracts, or controversies of
any type, kind, nature, description or character; (ii) debts, accounts, sums of
money, compensation, losses, costs or expense; (iii) breaches of contract, duty
or any other type of relationship; (iv) acts of omission, negligence,
misfeasance or malfeasance; and (v) commitments or promises of any type made
prior to the date hereof (the matters described in the preceding clauses (i)
through (v), inclusive, being herein called the "Claims", whether or not the
Claims are now known, unknown, or unforeseen, or are liquidated or unliquidated,
which in any manner arise out of, or relate to, the Notes, this Amendment, the
Agreement or otherwise arising out of facts or events existing or occurring
prior to the date hereof; including, without limitation, any Claims of the
borrower relating to: (a) the negotiation of the terms of the Term B Promissory
Note, this Amendment or the Agreement; or (b) any action or inaction of any of
the Released Parties with respect to the Notes, this Amendment or the Agreement.

                                   ARTICLE XV
                                FINAL AGREEMENT.

         THE LOAN AGREEMENT AS AMENDED BY THIS AMENDMENT AND THE OTHER LOAN
PAPERS REPRESENT THE ENTIRE AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS
BETWEEN THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed and delivered by their respective duly authorized officers as of the
date and year first above written.

                                           BORROWER:

                                           NATURAL GAS SERVICES GROUP, INC.

                                Schedule II - 12
<PAGE>
                       SECOND AMENDMENT TO LOAN AGREEMENT

         THIS SECOND AMENDMENT TO LOAN AGREEMENT (this "Amendment"), dated as of
March 20, 2001, is by and among Natural Gas Services Group, Inc., a Colorado
corporation (the "Borrower"), Wallace C. Sparkman, Wallace O. Sellers, CAV-RDV,
LTD., Diamente Investments, L.P., Rotary Gas Systems, Inc., NGE Leasing, Inc.
(collectively the "Guarantors"), and Western National Bank, a national banking
association (the "Lender").

         WHEREAS, the Borrower, the Guarantors and the Lender have entered into
that certain Loan Agreement, dated as of September 15, 1999, as amended by the
First Amendment and Waiver to Loan Agreement, dated as of March 9, 2001 (said
Loan Agreement, as amended, the "Loan Agreement");

         WHEREAS, the Borrower, the Guarantors and the Lender desire to further
amend the Loan Agreement in certain respects;

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein and other good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereto agree as follows:

                                   ARTICLE I
        DEFINITIONS. EXCEPT AS OTHERWISE EXPRESSLY PROVIDED HEREIN, ALL
            TERMS DEFINED IN THE LOAN AGREEMENT SHALL HAVE THE SAME
                                MEANINGS HEREIN.

                                   ARTICLE II
        AMENDMENT OF SECTION 5.1. SUBPARAGRAPH (A) OF SECTION 5.1 OF THE
           LOAN AGREEMENT IS HEREBY AMENDED TO READ IN ITS ENTIRETY AS
                                    FOLLOWS:

                  (a) as soon as available, but in any event not later than 120
         days after the end of each fiscal year of the Borrower, a copy of the
         audited consolidated balance sheet of the Borrower and its consolidated
         Subsidiaries as at the end of such year and the related consolidated
         statements of income and changes in cash flows for such year, setting
         forth in each case in comparative form the figures for the previous
         year, reported on without a "going concern" or like qualification or
         exception, or qualification arising out of the scope of the audit, by
         Hein + Associates LLP or other independent certified public accounting
         firm of recognized standing acceptable to the Lender;

                                  ARTICLE III
              REPRESENTATIONS AND WARRANTIES. THE BORROWER HEREBY
                REPRESENTS AND WARRANTS TO THE LENDER AS FOLLOWS:

                  (a) The representations and warranties contained in Article IV
         of the Loan Agreement are true and correct on and as of the date hereof
         as though made on and as of the date hereof.

                                Schedule II - 1
<PAGE>
                  (b) No Event of Default has occurred and is continuing (before
         or after giving effect to this Amendment).

                                   ARTICLE IV
         CONDITIONS PRECEDENT. THIS AMENDMENT SHALL BE EFFECTIVE AS OF
          THE DATE UPON WHICH ALL OF THE FOLLOWING CONDITIONS HAVE BEEN
                                   SATISFIED:

                           (i) the Lender shall have received counterparts of
                  this Amendment duly executed by the Borrower, the Guarantors
                  and the Lender; and

                           (ii) the Lender shall have received any other
                  documents, certificates and opinions in connection with this
                  Amendment as may be requested by the Lender, in form and
                  substance satisfactory to the Lender.

                                   ARTICLE V
                                 MISCELLANEOUS.

         SECTION 5.1. RATIFICATION. Except as expressly amended hereby, the Loan
Agreement and the other Loan Papers are and shall be unchanged and all of the
terms, provisions, covenants, conditions, schedules and exhibits thereof shall
remain and continue in full force and effect and are hereby ratified and
confirmed by the Borrower, the Guarantors and the Lender as of the date of this
Amendment as if the Loan Agreement and the other Loan Papers were reexecuted as
of the date of this Amendment.

         SECTION 5.2. MULTIPLE COUNTERPARTS. Multiple counterparts of this
Amendment may be signed by the parties (including by facsimile transmission),
each of which shall be an original but all of which together shall constitute
one and the same instrument.

         SECTION 5.3. REFERENCE TO AGREEMENT. Each of the Loan Papers is hereby
amended so that any reference in the Loan Papers to the Loan Agreement shall
mean a reference to the Loan Agreement as amended hereby.

         SECTION 5.4. GOVERNING LAW. This Amendment shall be governed by and
construed in accordance with the laws of the State of Texas.

         THE LOAN AGREEMENT AS AMENDED BY THIS AMENDMENT AND THE OTHER LOAN
PAPERS REPRESENT THE ENTIRE AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS
BETWEEN THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

                                 Schedule II - 2
<PAGE>
         IN WITNESS WHEREOF, the parties hereto have caused this instrument to
be effective as of the date first above written.

                                 BORROWER:

                                     NATURAL GAS SERVICES GROUP, INC.

                                     By:
                                        ----------------------------------------
                                     Wallace C. Sparkman, President

                                 LENDER:

                                     WESTERN NATIONAL BANK

                                     By: /s/ Scott A. Lovett
                                        ----------------------------------------
                                         Scott A. Lovett, Executive Vice
                                         President

                                 GUARANTORS:

                                     /s/ Wallace C. Sparkman
                                     -------------------------------------------
                                     Wallace C. Sparkman

                                     /s/ Wallace O. Sellers
                                     -------------------------------------------
                                     Wallace O. Sellers

                                     CAV-RDV, LTD.

                                     By: /s/ Kirk Mehaffey
                                        ----------------------------------------
                                         Kirk Mehaffey, General Partner

                                     DIAMENTE INVESTMENTS, L.P.

                                     By: Diamente Management, LLC, its general
                                         partner

                                     By: /s/ Wallace C. Sparkman
                                        ----------------------------------------
                                         Wallace C. Sparkman, President

                                 Schedule II - 3
<PAGE>
                                     ROTARY GAS SYSTEMS, INC.

                                     By:  /s/ Wayne Vinson
                                        ----------------------------------------
                                          Wayne Vinson, President

                                     NGE LEASING, INC.

                                     By:  /s/ Scott Sparkman
                                        ----------------------------------------
                                          Scott Sparkman, President

                                     By:  /s/ Wallace C. Sparkman
                                        ----------------------------------------
                                          Wallace C. Sparkman, President

                                 LENDER:

                                     WESTERN NATIONAL BANK

                                     By:  /s/ Scott A. Lovett
                                        ----------------------------------------
                                          Scott A. Lovett, Executive Vice
                                          President

                                 GUARANTORS:

                                     /s/ Wallace C. Sparkmen
                                     -------------------------------------------
                                     Wallace C. Sparkman

                                     /s/ Wallace O. Sellers
                                     -------------------------------------------
                                     Wallace O. Sellers

                                     CAV-RDV, LTD.

                                     By:  /s/ Kirk Mehaffey
                                        ----------------------------------------
                                          Kirk Mehaffey, General Partner

                                 Schedule II - 4
<PAGE>
                                     DIAMENTE INVESTMENTS, L,P.

                                     By:  Diamente Management, LLC, its general,
                                          partner

                                     By:
                                        ----------------------------------------
                                          Wallace C. Sparkman, President

                                 SUBSIDIARIES AND GUARANTORS:

                                     ROTARY GAS SYSTEMS, INC.

                                     By:  /s/ Wayne Vinson
                                        ----------------------------------------
                                     Wayne Vinson, President

                                     NGE LEASING, INC.

                                     By:  /s/ Scott Sparkman
                                        ----------------------------------------
                                          Scott Sparkman, President

                                 Schedule II - 5
<PAGE>
                  THIRD AMENDMENT AND WAIVER TO LOAN AGREEMENT

         THIS THIRD AMENDMENT AND WAIVER TO LOAN AGREEMENT (this "Amendment"),
dated as of July 25, 2001, is made and entered into by and between Natural Gas
Services Group, Inc., a Colorado corporation ("Borrower"), Wallace C. Sparkman,
Wallace O. Sellers, CAV-RDV, LTD., Diamente Investments, L.P., Rotary Gas
Systems, Inc., NGE Leasing, Inc. and Western National Bank, a national banking
association ("Lender").

                              W I T N E S S E T H:

         WHEREAS, Borrower and Lender entered into that certain Loan Agreement,
dated as of September 15, 1999, as amended by that certain First Amendment and
Waiver to Loan Agreement, dated as of March 9, 2001, and as further amended by
that certain Second Amendment to Loan Agreement, dated as of March 20, 2001,
(said Loan Agreement, as so amended, the "Loan Agreement"), providing for, among
other things, loans to Borrower;

         WHEREAS, the Borrower proposes to issue and sell up to 1,177,000 shares
of its preferred stock, to be designated 10% Convertible Series A Preferred
Stock, $.01, par value per share (the "Preferred Stock"), at a price of $3.25
per share;

         WHEREAS, the Borrower has requested that Lender consent to the proposed
issuance of the Preferred Stock and waive and amend certain covenants in the
Loan Agreement that prohibit the issuance and sale of the Preferred Stock and
the payment of dividends thereon;

         WHEREAS, the Lender is agreeable to the Borrower's requests but only
upon and subject to the terms and provisions which are hereinafter specified.

         NOW THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements herein contained, and intending to be legally bound
hereby, the parties hereto hereby agree as follows:

                                   ARTICLE I
                                 DEFINED TERMS.

         In addition to the terms defined in this Amendment, all terms defined
in the Agreement, and not otherwise defined herein, shall have the meaning given
them in the Agreement when used herein.

                                   ARTICLE II
                                    WAIVERS.

                  (a) Subject to paragraphs (b) and (c) below, the Lender hereby
         waives compliance with Section 6.4 of the Loan Agreement, but solely to
         the extent necessary to permit Natural Gas Services Group, Inc. to
         amend its articles of incorporation to provide for the due
         authorization and creation of a class of securities consisting of not
         more than 1,177,000 shares of Preferred Stock.

                                 Schedule II - 6
<PAGE>
                  (b) Except as to the specific parties and the specific
         transactions referenced above and except as expressly waived herein,
         the Loan Agreement shall continue to be, and shall remain, in full
         force and effect. This waiver shall not be deemed to be a waiver of, or
         consent to, or a modification or amendment of any other term or
         condition of the Loan Agreement or to prejudice any other right or
         rights which the Lender may now have or may have in the future under or
         in connection with the Loan Agreement or any of the instruments or
         agreements referred to therein, as the same may be amended from time to
         time.

                  (c) Notwithstanding the waiver by the Lender of the matters
         set forth above, the waiver of the Lender herein shall be ineffectual
         and of no force and effect to the extent that (i) there are any
         material changes, alterations or additions in or to the terms of the
         issuance and sale of the Preferred Stock as described in the draft of
         private placement memorandum, dated July 23, 2001, delivered to the
         Lender and which changes, alterations or additions are not disclosed to
         and approved by the Lender prior to the effectiveness of any such
         changes, alteration or addition or (ii) Borrower omitted to disclose to
         the Lender or incorrectly described a material terms, provision or
         element of any such Preferred Stock, or the transactions related
         thereto, necessary in order to make the descriptions of the issuance
         and sale of the Preferred Stock not misleading to the Lender.

                                  ARTICLE III
                          AMENDMENTS TO LOAN AGREEMENT.

         SECTION 3.1. DIVIDENDS, REDEMPTIONS AND OTHER PAYMENTS. Section 6.9 of
the Loan Agreement is amended to read in full as follows:

                  6.9 Dividends, Redemptions and Other payments. Declare or pay
                  any dividends (except dividends payable solely in its own
                  capital stock or limited liability company membership
                  interests, as the case may be) on, or redeem, retire, purchase
                  or otherwise acquire for value, any shares of any class of its
                  respective shares of capital stock or limited liability
                  company membership interests, as the case may be, now or
                  hereafter outstanding, or return any capital to its
                  shareholders or members, as the case may be, or make any other
                  distribution in respect thereof; whether in cash or property
                  or in obligations of the Borrower or any Subsidiary, except
                  that Natural Gas Services Croup, Inc. may declare and pay cash
                  dividends on its outstanding shares of 10% Convertible Series
                  A Preferred Stock, $.01 par value per share, if:

                           (i) there is not in existence, at the time of the
                  dividend payment to be made, an "Event of Default" as defined
                  in Section 7.1 of this Agreement; and

                                 Schedule II - 7
<PAGE>
                           (ii) the dividend payment to be made would not cause
                  or result in the occurrence of an "Event of Default" as
                  defined in Section 7.1 of this Agreement.

                                   ARTICLE IV
                         REPRESENTATIONS AND WARRANTIES.

         To induce Lender to enter into this Amendment, Borrower hereby
represents and warrants to the Lender as follows:

                  (a) Borrower has the corporate power, authority and legal
         right to make and deliver this Amendment and to perform its obligations
         under the Loan Agreement as amended hereby and has taken all action
         necessary to authorize the execution and delivery of this Amendment and
         the performance of the Loan Agreement as amended hereby.

                  (b) This Amendment has been duly executed and delivered on
         behalf of Borrower by its duly authorized officer, and this Amendment
         constitutes a legal, valid and binding obligation of Borrower,
         enforceable in accordance with its terms, except as the enforceability
         thereof may be limited by applicable bankruptcy, reorganization,
         insolvency, moratorium or other laws affecting creditors' rights
         generally and by general equitable principles (whether enforcement is
         sought by proceedings in equity or at law).

                  (c) The execution, delivery and performance by Borrower of
         this Amendment do not violate or constitute a default under any
         provision of applicable law or any agreement binding upon Borrower or
         the Subsidiaries of Borrower or result in the creation or imposition of
         any lien upon any of the assets of Borrower or the Subsidiaries of
         Borrower, except Liens expressly permitted by the Loan Agreement.

                  (d) No Event of Default has occurred and is continuing (before
         and after giving effect to this Amendment).

                  (e) The Borrower has provided to the Lender a copy of a draft
         of its private placement memorandum, dated July 23, 2001, and a copy of
         the certificate of designations of the Preferred Stock, both of which
         are true, accurate and complete in all material respects.

                                   ARTICLE V
                              CONDITIONS PRECEDENT.

         This Amendment shall be effective only upon satisfaction of the
following conditions precedent:

                  (a) Lender shall have received counterparts of this Amendment
         duly executed and delivered by Borrower and Guarantors;

                  (b) no Event of Default shall have occurred and be continuing
         as of the date of this Amendment; and

                                 Schedule II - 8
<PAGE>
                  (c) Lender shall have received such other agreements,
         documents and instruments as Lender may require.

                                   ARTICLE VI
                       NO OTHER AMENDMENTS & RATIFICATION.

         Except as expressly amended and modified by this Amendment, all of the
provisions and covenants of the Loan Agreement, all exhibits thereto and all
stock pledge agreements, security agreements, guarantees and all other Loan
Papers are and shall continue to remain in full force and effect in accordance
with the terms thereof and are hereby ratified and confirmed by Borrower, the
Subsidiaries and Guarantors as of the date of this Amendment as if the Loan
Agreement and such other Loan Papers were reexecuted as of the date of this
Amendment. The amendments contemplated hereby shall not limit or impair any Bank
Liens securing the Obligations, each of which are hereby ratified, affirmed and
extended to secure the Obligations.

                                  ARTICLE VII
                           NO ADDITIONAL COMMITMENTS.

         Borrower and Guarantors understand, acknowledge and agree that Lender
has not made any commitments, and has no obligation, to renew, extend,
refinance, increase or otherwise modify any of the Notes after the respective
maturity date of each such Note.

                                  ARTICLE VIII
                                  COUNTERPARTS.

         This Amendment may be executed by one or more of the parties hereto in
any number of separate counterparts and all of said counterparts taken together
shall be deemed to constitute one and the same instrument.

                                   ARTICLE IX
                        GLOBAL AMENDMENT OF LOAN PAPERS.

         All of the Loan Papers are hereby modified wherever necessary, and even
though not specifically addressed herein, so as to conform to the amendments to
the Loan Agreement as set forth herein, and Borrower, the Subsidiaries and
Guarantors covenant to observe, comply with and perform each of the terms and
provisions of the Loan Papers to which they are parties, as modified hereby.
Each Loan Paper to which Borrower and the Subsidiaries or any Guarantor is a
party is hereby amended so that any reference in each such Loan Paper to the
Loan Agreement shall mean a reference to the Loan Agreement as amended hereby.

                                   ARTICLE X
                                    RELEASE.

         The Borrower and Guarantors hereby release the Lender and its officers,
directors, shareholders, agents, employees, attorneys, agents and
representatives (collectively, the "Released Parties") from any and all (i)
damages, claims, liabilities, causes of action, contracts, or controversies of
any type, kind, nature, description or character; (ii) debts, accounts, sums of
money, compensation, losses, costs or expense; (iii) breaches of contract, duty
or any other type

                                 Schedule II - 9
<PAGE>
of relationship; (iv) acts of omission, negligence, misfeasance or malfeasance;
and (v) commitments or promises of any type made prior to the date hereof (the
matters described in the preceding clauses (i) through (v), inclusive, being
herein called the "Claims", whether or not the Claims are now known, unknown, or
unforeseen, or are liquidated or unliquidated, which in any manner arise out of,
or relate to, the Notes, this Amendment, the Loan Agreement or otherwise arising
out of facts or events existing or occurring prior to the date hereof;
including, without limitation, any Claims of the Borrower relating to: (a) this
Amendment or the Loan Agreement; or (b) any action or inaction of any of the
Released Parties with respect to the Notes, this Amendment or the Loan
Agreement.

                                   ARTICLE XI
                                 GOVERNING LAW.

         THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS.

                                  ARTICLE XII
                                FINAL AGREEMENT.

         THE LOAN AGREEMENT AS AMENDED BY THIS AMENDMENT AND THE OTHER LOAN
PAPERS REPRESENT THE ENTIRE AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS
BETWEEN THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

         IN WITNESS WHEREOF, the Parties hereto have caused this Amendment to be
executed and delivered by their respective duly authorized officers as of the
date and year first above written.

                                     BORROWER:

                                         NATURAL GAS SERVICES GROUP, INC.

                                         By: /s/ Wayne L. Vinson
                                             -----------------------------------
                                             Wayne L. Vinson, President

                                     LENDER:

                                         WESTERN NATIONAL BANK

                                         By: /s/ Wesley D. Bownds
                                             -----------------------------------
                                             Wesley D. Bownds, Senior Vice
                                             President

                                Schedule II - 10
<PAGE>
                                     GUARANTORS:

                                         By: /s/ Wallace C. Sparkman
                                             -----------------------------------
                                             Wallace C. Sparkman

                                         By: /s/ Wallace O. Sellers
                                             -----------------------------------
                                             Wallace O. Sellers

                                         CAV-RDV, LTD.

                                         By: /s/ Kirk Mehaffey
                                             -----------------------------------
                                             Kirk Mehaffey, General Partner

                                         DIAMENTE INVESTMENTS, L.P.

                                         By: Diamente Management, LLC, its
                                             general partner

                                         By: /s/ Wallace C. Sparkman
                                             -----------------------------------
                                             Wallace C. Sparkman, President

                                     SUBSIDIARIES AND GUARANTORS:

                                         ROTARY GAS SYSTEMS, INC.

                                         By: /s/ Wayne Vinson
                                             -----------------------------------
                                             Wayne Vinson, President

                                         NGE LEASING, INC.

                                         By: /s/ Scott Sparkman
                                             -----------------------------------
                                             Scott Sparkman, President

                                Schedule II - 11<PAGE>
                                                                   EXHIBIT 10.05

                               EMPLOYMENT CONTRACT

         By this Agreement, Natural Gas Services Group, Inc., doing business as
Rotary Gas Systems, referred to in this Agreement as Employer, located at
Midland, Texas, employs Alan Kurus, referred to in this Agreement as Employee,
of Troy, Ohio, who accepts employment on the following terms and conditions:

                                   ARTICLE 1

                               TERM OF EMPLOYMENT

         1.01 By this Agreement, the Employer employs the Employee, and the
Employee accepts employment with the Employer, for a period of time beginning
October 16, 2000, and ending on December 31, 2003; however, this Agreement may
be terminated earlier, as provided in Article 7, below. Extension of this
contract may be negotiated by the parties.

                                   ARTICLE 2

                                  COMPENSATION

         2.01 As compensation for all services rendered under this Agreement,
the Employee shall be paid by the Employer an annual salary of $90,000.00 per
year, payable in bi-weekly installments of $3,461.54, during the period of
employment. The amount paid is to be prorated for any partial employment period.

         2.02 In addition to the compensation set forth in Paragraph 2.01, the
Employee shall be entitled to receive a percentage of pre-tax profits to be
determined as follows. Attached to this Contract and marked as Exhibit A, is a
budget for the calendar years of 2001, 2002, and 2003. After Employer has
recovered all accrued operating losses, then at the end of each calendar year,
that year's results of operations will be compared to the attached budget. If
there is no pre-tax net profit, then no further compensation for that year shall
be paid to Employee. If there is a pre-
<PAGE>
tax net profit that is less than the budget amount, the Employee shall receive
as additional compensation, an amount equal to five (5%) percent of such pre-tax
net profits. If the pre-tax net profit meets or exceeds the budget amount, then
the Employee shall receive as additional compensation, an amount equal to ten
per cent (10%) of such pre-tax profit.

         2.03 The Employee shall be paid moving expenses by the Employer in an
amount of $12,500.00.

         2.04 After the completion of six (6) months of service in the employ of
the Employer, the Employee shall be entitled to an annual paid vacation of
fifteen (15) business days with full pay. Such vacation shall be taken at any
time selected by the Employee and approved by the Employer. In addition, the
Employee shall be entitled to six (6) days per year as sick leave with pay.
Neither vacation time nor sick leave may be accumulated, and if not used during
the year in which it is granted, it shall be deemed to have been waived by the
Employee. Provided, however, up to five days of vacation time may be carried
forward to the next year with Management approval.

         2.05 The Employee shall be entitled to a holiday with full pay on New
Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day,
Christmas Day, and/or any other day designated as a holiday by the Employer.

         2.06 The Employer agrees that during the term of employment the
Employee shall be afforded the opportunity to participate in any profit sharing
trust, pension plan, deferred compensation plan, hospitalization plan, medical
or dental service plans, health insurance plan, or any other employee benefit
plan that may be in effect at any time or from time to time during the term of
employment hereof, which is generally available to other employees of the
Employer,

                                       2
<PAGE>
other than any bonus plan or other plan measured by the income or performance of
the Employer. Participating in any such plans shall be consistent with the
Employee's rate of basic compensation to the extent that compensation is a
determinant with respect to coverage or participation under any such plan;
provided, however, that the Employee's participation shall not be limited by
reason of income or basic compensation if such limitations are not necessary to
obtain tax deductions or are not required by law.

                                   ARTICLE 3

                               DUTIES OF EMPLOYEE

                                     Duties

         3.01 The Employee is employed as a Vice President - Sales and Marketing
for the RGS Compressor Company division of Rotary Gas Systems, and shall work at
Employer's location in Midland, Texas. The Employee shall provide all services
required for the successful development, marketing, and operation of the
production and sale of small air compressors in accordance with the budget
prepared and attached hereto as Exhibit "A".

                               Extent of Services

         3.02 During the term of this Agreement, the Employee may engage in any
other business or professional activity, provided that none of it is performed
during normal working hours or at the place of business of the Employer.

                           Changes in Required Duties

         3.03 The duties to be performed by the Employee shall be determined
from time to time by the President or Rotary Gas Systems.

                                       3
<PAGE>
                                   ARTICLE 4

              EMPLOYEE'S OBLIGATIONS OTHER THAN TO PERFORM SERVICES

                           Non-competition by Employee

         4.01 During the term of this Agreement, the Employee shall not,
directly or indirectly, either as an employee, employer, consultant, agent,
principal, partner, stockholder, corporate officer, director, or in any other
individual or representative capacity, engage or participate in any business
that is in competition in any manner whatever with the business of the Employer.
Furthermore, upon the termination of this Agreement, the Employee expressly
agrees not to engage or participate, directly or indirectly, in any business
located within 500 miles that is in competition with the business of the
Employer for a period of one year.

                               Liquidated Damages

         4.02 In the event of a breach by the Employee of the obligation not to
compete contained in Paragraph 4.01 of this Agreement, the Employee shall pay to
the Employer the sum of $2,500.00 per month as liquidated damages for the period
during which the Employee continues to be in breach of the obligation not to
compete. The Employer and the Employee agree that the amount established by this
Paragraph as liquidated damages is reasonable under the circumstances existing
at the time of the execution of this Agreement.

         4.03 The Employee shall indemnify and hold harmless the Employer from
all liability from loss, damage, or injury to persons or property resulting from
the negligence or misconduct of the Employee committed in the scope of the
Employee's employment.

                                       4
<PAGE>
                                   ARTICLE 5

                           PROPERTY RIGHTS OF PARTIES

                                  Trade Secrets

         5.01 During the term of employment, the Employee will have access to
and become familiar with various trade secrets, consisting of formulas, devices,
secret inventions, processes, and compilations of information, records, and
specifications, owned by the Employer and regularly used in the operation of the
business of the Employer. The Employee shall not disclose any such trade
secrets, directly or indirectly, not use them in any way, either during the term
of this Agreement or at any time thereafter, except as required in the course of
his employment. All files, records, documents, drawings, specifications,
equipment, and similar items relating to the business of the Employer, whether
or not prepared by the Employee, shall remain the exclusive property of the
Employer and shall not be removed from the premises of the Employer under any
circumstances without the prior written consent of the Employer.

         5.02 On the termination of employment or whenever requested by the
Employer, the Employee shall immediately deliver to the Employer all property in
the Employee's possession or under the Employee's control belonging to the
Employer, in good condition, ordinary wear and tear excepted.

                                   ARTICLE 6

                             OBLIGATIONS OF EMPLOYER

                      Indemnification of Losses of Employee

         6.01 The Employer shall indemnify the Employee for all losses sustained
by the Employee, and asserted by others, but not the result of the negligence or
misconduct of the Employee, as a direct result of the discharge of his duties
required by this Agreement.

                                       5
<PAGE>
                              Examination of Books

         6.02 The Employee shall have the right, either personally or by an
accountant retained and paid by the Employee, to examine the books and accounts
of the Employer at times mutually convenient to the Employee and the Employer at
least once each year, to examine the books and accounts of the Employer to the
extent that they relate to transactions affecting the amount of the Employee's
compensation as set forth in Article 2.

                                   ARTICLE 7

                                   TERMINATION

                           Termination by Either Party

         7.01 This Agreement may be terminated by either party for material
breech by giving 60 days' written notice of termination to the other party. Such
termination shall not prejudice any remedy that the terminating party may have
at law or in equity.

                      Effect of Termination on Compensation

         7.02 In the event of the termination of this Agreement prior to the
completion of the term of employment specified in Article 1, the Employee shall
be entitled to the compensation earned by the Employee prior to the date of
termination as provided for in this Agreement, computed pro rata up to and
including that date. The Employee shall be entitled to no further compensation
after the date of termination.

                                   ARTICLE 8

                               GENERAL PROVISIONS

                                     Notices

         8.01 All notices or other communications required under this Agreement
may be effected either by personal delivery in writing or by certified mail,
return receipt requested.

                                       6
<PAGE>
Notice shall be deemed to have been given when delivered or mailed to the
parties at their respective addresses as set forth above or when mailed to the
last address provided in writing to the other party by the addressee.

                              Entirety of Agreement

         8.02 This Agreement supersedes all other agreements, either oral or in
writing, between the parties to this Agreement, with respect to the employment
of the Employee by the Employer. This Agreement contains the entire
understanding of the parties and all of the covenants and agreements between the
parties with respect to such employment.

                                  Modification

         8.03 This Agreement shall not be amended, modified, or altered in any
manner except in writing signed by both parties.

                          Failure to Enforce Not Waiver

         8.04 Any failure or delay on the part of either the Employer or the
Employee to exercise any remedy or right under this Agreement shall not operate
as a waiver. The failure of either party to require performance of any of the
terms, covenants, or provisions of this Agreement by the other party shall not
constitute a waiver of any of the rights under the Agreement. No forbearance by
either party to exercise any rights or privileges under this Agreement shall be
construed as a waiver, but all rights and privileges shall continue in effect as
if no forbearance had occurred. No covenant or condition of this Agreement may
be waived except by the written consent of the waiving party. Any such written
waiver of any term of this Agreement shall be effective only in the specific
instance and for the specific purpose given.

                                       7
<PAGE>
                             Law Governing Agreement

         8.05 This agreement shall be exclusively governed by and construed in
accordance with the laws of the State of Texas.

                               Partial Invalidity

         8.06 If any provision in this Agreement is held by a court of competent
jurisdiction to be invalid, void, or unenforceable, the remaining provisions
shall remain in full force and effect, as if this Agreement had been executed
without any such invalid provisions having been included.

         Executed at Midland, Texas, on this 31st day of August, 2000.

                                         EMPLOYER

WITNESS WITH APPROVAL:                   NATURAL GAS SERVICES GROUP, INC.
ROTARY GAS SYSTEMS

/s/ Wayne Vinson                         By: /s/ Wallace Sparkman
---------------------------------            -----------------------------------
Wayne Vinson, President                      Wallace Sparkman, President

                                         EMPLOYEE

                                         /s/ Alan Kurus
                                         ---------------------------------------
                                         Alan Kurus

                                       8
<PAGE>
                             RGS COMPRESSOR COMPANY
                                4 YEAR PROJECTION

                                    EXHIBIT A
                                       TO
                               Employment Contract
                                       and
                             Incentive Stock Option

by Earl Wait                          cover                       8/10/004:19 PM
<PAGE>
<TABLE>
<CAPTION>
MIDLAND COMPRESSOR COMPANY
Projections 2000                         prototypes    prototype
                                         -------------------------------------------------------------------------
                                              Eight         Nine        Ten       Eleven      Twelve       YTD
                                         -------------------------------------------------------------------------
<S>                                      <C>             <C>         <C>         <C>         <C>         <C>
REVENUE:                                                                                                 $      0
  SALES - COMPRESSOR UNITS/30                                                                            $      0
  SALES - COMPRESSOR UNITS/50                                                                            $      0
  SALES - COMPRESSOR UNITS/100                                                                           $      0
  SALES - COMPRESSOR UNITS
                                         -------------------------------------------------------------------------
  SALES - PARTS                                  --           --          --          --          --           --
                                         -------------------------------------------------------------------------

DIRECT COST:
  DIRECT LABOR                                                         1,056       1,056       1,056        3,168
  DIRECT MATERIAL - UNITS/15                                           1,190       1,190       1,190        3,570
  DIRECT MATERIAL - UNITS/30                                           2,930       2,930       2,930        8,790
  DIRECT MATERIAL - UNITS/50                                           3,757       3,757       3,757       11,271
  DIRECT MATERIAL - UNITS/100                                          6,521       6,521       6,521       19,563
  DIRECT MATERIAL - PARTS                                                 --          --          --           --
  FREIGHT-in                                                             990         990         990        2,970
  WARRANTY                                       --           --                                               --
                                         -------------------------------------------------------------------------
                                                 --           --      16,444      16,444      16,444       49,332
                                         -------------------------------------------------------------------------
INDIRECT COSTS:
  SALARIES                                       --           --          --          --          --           --
  SHOP SUPPLIES & SMALL TOOLS                                 --        1,500       1,500       1,500       4,500
  DRAFTING - CONTRACT                                                   3,500       3,500       3,500      10,500
  SHIPPING & RECEIVING                           --           --          --          --          --           --
                                         -------------------------------------------------------------------------
                                                 --           --       5,000       5,000       5,000       15,000
                                         -------------------------------------------------------------------------
TOTAL COST OF SALE                               --           --      21,444      21,444      21,444       64,332
                                         -------------------------------------------------------------------------
GROSS MARGIN                                     --           --     (21,444)    (21,444)    (21,444)     (64,332)
                                         -------------------------------------------------------------------------
SELLING EXPENSES:
  SALES - SALARIES                                         7,500       7,500       7,500       7,500       30,000
  ADVERTISING                                                          4,500       5,800       5,800       16,100
  EMPLOYEE TRAVEL                                          2,000       2,000       2,000       2,000        8,000
  TELEPHONE                                                  250         500         500         500        1,750
  AUTO OPERATING EXPENSES                                    500         500         500         500        2,000
                                         -------------------------------------------------------------------------
                                                 --       10,250      15,000      16,300      16,300       57,850
                                         -------------------------------------------------------------------------
ADMINISTRATIVE EXPENSES:
  SALARIES - ADMINISTRATIVE                   7,500        7,500       7,500       7,500       7,500       37,500
  PAYROLL TAXES                                 750        1,500      18,500       1,850       1,850        7,800
  RELOCATION EXPENSES                        12,500       12,500                                           25,000
  INSURANCE/GROUP HEALTH                        500          750         750         750         750        3,500
  INSURANCE                                   1,000        1,000       1,000       1,000       1,000        5,000
                                         -------------------------------------------------------------------------
                                             22,250       23,250      11,100      11,100      11,100       78,800
                                         -------------------------------------------------------------------------
OTHER INCOME & EXPENSE
  DEPRECIATION EXPENSE                         (250)        (250)       (250)       (250)       (250)      (1,250)
  INTEREST EXPENSE                               --           --          --          --          --           --
                                         -------------------------------------------------------------------------
NET INCOME                                  (22,500)     (33,750)    (47,794)    (49,094)    (49,094)    (202,232)
                                         =========================================================================
CONVERT TO CASH:
  add back depreciation                         250          250         250         250         250        1,250
  purchase inventory                                                             (82,383)    (82,383)    (164,766)
  Office addition                          $(30,000)                                                      (30,000)
                                         -------------------------------------------------------------------------
  net cash flow                             (52,250)     (33,500)    (47,544)   (131,227)   (131,227)   $(395,748)
                                         -------------------------------------------------------------------------
  accumulated cash                          (52,250)     (85,750)   (133,294)   (264,521)   (395,748)
                                         ============================================================
PAYOUT ON NET PROFITS                       (22,500)     (56,250)   (104,044)   (153,138)   (202,232)

manufacturing cost to build prototypes           --           --      32,544      32,544      32,544       97,632
                                         -------------------------------------------------------------------------
  ADJUSTED NET INCOME                       (22,500)     (33,750)    (15,250)    (16,550)    (16,550)    (104,600)
                                         -------------------------------------------------------------------------
</TABLE>

                                     Page 1
<PAGE>
<TABLE>
<CAPTION>
MIDLAND COMPRESSOR COMPANY      --------------------------------------------------------------------------------------------------

2001 projections                   One         Two         Three        Four       Five         Six         Seven       Eight
                                --------------------------------------------------------------------------------------------------
<S>                             <C>         <C>          <C>         <C>         <C>         <C>          <C>         <C>
REVENUE:
  SALES - COMPRESSOR UNITS/10   $       0   $       0    $       0   $       0   $   3,982   $   3,982    $   3,982   $   7,964
  SALES - COMPRESSOR UNITS/15   $       0   $       0    $       0   $       0   $   5,219   $  10,438    $  10,438   $  10,438
  SALES - COMPRESSOR UNITS/20   $       0   $       0    $       0   $   6,079   $   6,079   $   6,079    $   6,079   $  12,158
  SALES - COMPRESSOR UNITS/25   $       0   $       0    $       0   $  12,796   $  19,194   $  19,194    $  25,592   $  25,592
  SALES - COMPRESSOR UNITS/30   $       0   $  13,540    $   6,770   $   6,770   $  20,310   $  20,310    $  27,080   $  27,080
  SALES - COMPRESSOR UNITS/40   $       0   $       0    $       0   $       0   $   8,897   $   8,897    $  17,794   $  17,794
  SALES - COMPRESSOR UNITS/50   $  18,990   $   9,495    $   9,495   $  18,990   $  23,485   $  28,485    $  37,980   $  37,980
  SALES - COMPRESSOR UNITS/60   $       0   $       0    $       0   $       0   $       0   $       0    $  13,407   $  26,814
  SALES - COMPRESSOR UNITS/75   $       0   $       0    $       0   $  15,605   $  15,605   $  31,210    $  31,210   $  62,420
  SALES - COMPRESSOR UNITS/100  $       0   $       0    $       0   $  37,600   $  37,600   $  37,600    $  56,400   $  75,200
  SALES -- PARTS
                                --------------------------------------------------------------------------------------------------
                                   18,990      23,035       16,265      97,840     136,474     166,195      229,962     303,440
                                --------------------------------------------------------------------------------------------------
DIRECT COST:
  DIRECT LABOR                      2,860   $   2,860        2,860       2,860       2,860       2,860        2,860       2,860
  DIRECT MATERIAL - UNITS/10    $       0   $       0    $       0   $       0   $   2,750   $   2,750    $   2,750   $   5,500
  DIRECT MATERIAL - UNITS/15    $       0   $       0    $       0   $       0   $   2,852   $   5,704    $   5,704   $   5,704
  DIRECT MATERIAL - UNITS/20    $       0   $       0    $       0   $   3,250   $   3,250   $   3,250    $   3,250   $   6,500
  DIRECT MATERIAL - UNITS/25    $       0   $       0    $       0   $   6,654   $   9,981   $   9,981    $  13,308   $  13,308
  DIRECT MATERIAL - UNITS/30    $       0   $   7,439    $   3,719   $   3,719   $  11,158   $  11,158    $  14,877   $  14,877
  DIRECT MATERIAL - UNITS/40    $       0   $       0    $       0   $       0   $       0   $   5,735    $  11,470   $  11,470
  DIRECT MATERIAL - UNITS/50    $   9,622   $   4,811    $   4,811   $   9,622   $  14,433   $  15,433    $  19,244   $  19,244
  DIRECT MATERIAL - UNITS/60    $       0   $       0    $       0   $       0   $       0   $       0    $   9,085   $  18,170
  DIRECT MATERIAL - UNITS/75    $       0   $       0    $       0   $   8,505   $   8,505   $  17,010    $  17,010   $  34,020
  DIRECT MATERIAL - UNITS/100   $       0   $       0    $       0   $  18,854   $  18,854   $  18,854    $  28,281   $  37,708
  DIRECT MATERIAL - PARTS              --          --           --          --          --          --           --          --
  FREIGHT - in                        481         612          427       2,530       3,589       4,444        6,249       8,325
  WARRANTY                            289         367          256       1,518       2,153       2,656        3,749       4,995
                                --------------------------------------------------------------------------------------------------
                                   13,252      16,090       12,073      57,513      80,386       98,845     137,838     182,682
                                --------------------------------------------------------------------------------------------------
INDIRECT COSTS:
  SALARIES
  SHOP SUPPLIES & SMALL TOOLS       1,500       1,500        1,500       1,500       1,500       1,500        1,500       1,500
  DRAFTING -- CONTRACT                 --          --           --          --          --          --           --          --
  SHIPPING & RECEIVING              3,000       3,000        3,000       3,000       3,000       3,000        3,000       3,000
  CONTINGENCIES                     1,000       1,000        1,000       1,000       1,000       1,000        1,000       1,000
                                --------------------------------------------------------------------------------------------------
                                    5,500       5,500        5,500       5,500       5,500       5,500        5,500       5,500
                                --------------------------------------------------------------------------------------------------
TOTAL COST OF SALE                 18,752      21,590       17,573      63,013      85,886     104,345      143,338     188,182
                                --------------------------------------------------------------------------------------------------
GROSS MARGIN                          238       1,445       (1,308)     34,827      50,588      61,850       86,624     115,258
                                --------------------------------------------------------------------------------------------------
SELLING EXPENSES:
  SALES - SALARIES                  7,500       7,500        7,500       7,500       7,500       7,500        7,500       7,500
  ADVERTISING                       5,800       5,800        5,800       5,800       5,800       5,800        5,800       5,800
  EMPLOYEE TRAVEL                   2,000       2,000        2,000       2,000       2,000       2,000        2,000       2,000
  TELEPHONE                           500         500          500         500         500         500          500         500
  AUTO OPERATING EXPENSES             500         500          500         500         500         500          500         500
                                --------------------------------------------------------------------------------------------------
                                   16,300      16,300       16,300      16,300      16,300      16,300       16,300      16,300
                                --------------------------------------------------------------------------------------------------
ADMINISTRATIVE EXPENSES:
  SALARIES - ADMINISTRATIVE         7,500       7,500        7,500       7,500       7,500       7,500        7,500       7,500
  PAYROLL TAXES                     2,086       2,086        2,086       2,086       2,086       2,086        2,086       2,086
  BONUS
  INSURANCE/GROUP HEALTH              750         750          750         750         750         750          750         750
  INSURANCE                         1,000       1,000        1,000       1,000       1,000       1,000        1,000       1,000
                                --------------------------------------------------------------------------------------------------
                                   11,336      11,336       11,336      11,336      11,336      11,336       11,336      11,336
                                --------------------------------------------------------------------------------------------------
OTHER INCOME & EXPENSE
  DEPRECIATION EXPENSE               (250)       (250)        (250)       (250)       (250)       (250)        (250)       (250)
  INTEREST EXPENSE                     --          --           --          --          --          --           --          --
                                --------------------------------------------------------------------------------------------------
NET INCOME                        (27,648)    (26,191)     (29,194)      6,941      22,702      33,964       58,738      87,372
                                ==================================================================================================
Convert to cash:
  add back depreciation               250         250          250         250         250         250          250         250
  inventory purchases                                                                          (56,336)
                                --------------------------------------------------------------------------------------------------
  net cash flow                   (27,398)    (26,191)     (28,944)      7,191      22,952     (22,122)      58,988      87,622
                                --------------------------------------------------------------------------------------------------
  accumulated cash               (423,146)   (449,337)    (478,281)   (471,090)   (448,137)   (470,260)    (411,272)   (323,650)
                                ==================================================================================================
  Payout on net profits          (229,880)   (256,321)    (285,515)   (278,574)   (255,871)   (221,908)    (163,170)    (75,798)
</TABLE>

<TABLE>
<CAPTION>
MIDLAND COMPRESSOR COMPANY      -------------------------------------------------------------
                                                                                                          SALE
2001 projections                   Nine          Ten       Eleven      Twelve          Ytd                PRICE
                                -------------------------------------------------------------
<S>                             <C>         <C>         <C>         <C>           <C>             <C>   <C>
REVENUE:
  SALES - COMPRESSOR UNITS/10   $   7,974   $   7,964   $   3,982   $     3,982   $    43,802       2%  $ 3,982
  SALES - COMPRESSOR UNITS/15   $  15,857   $  10,438   $  10,438   $     5,219   $    78,285       4%  $ 5,219
  SALES - COMPRESSOR UNITS/20   $  12,158   $  12,158   $  12,158   $    12,158   $    85,106       4%  $ 6,079
  SALES - COMPRESSOR UNITS/25   $  25,592   $  31,990   $  25,592   $    19,194   $   204,736      10%  $ 6,398
  SALES - COMPRESSOR UNITS/30   $  27,080   $  33,850   $  33,850   $    20,310   $   236,950      12%  $ 6,770
  SALES - COMPRESSOR UNITS/40   $  26,691   $  17,794   $   8,897   $     8,897   $   106,764       5%  $ 8,897
  SALES - COMPRESSOR UNITS/50   $  37,980   $  47,475   $  47,475   $    37,980   $   360,810      18%  $ 9,495
  SALES - COMPRESSOR UNITS/60   $  40,221   $  26,814   $  13,407   $    13,407   $   134,070       7%  $13,407
  SALES - COMPRESSOR UNITS/75   $  62,420   $  46,815   $  31,210   $    31,210   $   327,705      16%  $15,605
  SALES - COMPRESSOR UNITS/100  $  75,200   $  56,400   $  56,400   $    37,600   $   470,000      23%  $18,800
  SALES -- PARTS                                                                  $         0       0%
                                ----------------------------------------------------------------------
                                  330,963     291,698     243,409       189,957     2,048,228     100%
                                ----------------------------------------------------------------------
DIRECT COST:
  DIRECT LABOR                      2,860       2,860       2,860         2,860        34,320       2%
  DIRECT MATERIAL - UNITS/10    $   5,500   $   5,500   $   2,750   $     2,750        30,250       1%
  DIRECT MATERIAL - UNITS/15    $   8,556   $   5,704   $   5,704   $     2,852   $    42,780       2%
  DIRECT MATERIAL - UNITS/20    $   6,500   $   6,500   $   6,500   $     6,500   $    45,500       2%
  DIRECT MATERIAL - UNITS/25    $  13,308   $  16,635   $  13,308   $     9,981   $   106,464       5%
  DIRECT MATERIAL - UNITS/30    $  14,877   $  18,597   $  18,597   $    11,158   $   130,178       6%
  DIRECT MATERIAL - UNITS/40    $  17,205   $  11,470   $   5,735   $     5,735   $    68,821       3%
  DIRECT MATERIAL - UNITS/50    $  19,244   $  24,055   $  24,055   $    19,244   $   182,818       9%
  DIRECT MATERIAL - UNITS/60    $  27,255   $  18,170   $   9,085   $     9,085   $    90,848       4%
  DIRECT MATERIAL - UNITS/75    $  34,020   $  25,515   $  17,010   $    17,010   $   178,604       9%
  DIRECT MATERIAL - UNITS/100   $  37,708   $  28,281   $  28,281   $    18,854   $   235,678      12%
  DIRECT MATERIAL - PARTS              --          --          --            --            --       0%
  FREIGHT - in                      9,209       8,021       6,551         5,158   $    55,597       3%
  WARRANTY                          5,525       4,813       3,931         3,095   $    33,358       2%
                                ----------------------------------------------------------------------
                                  201,767     176,121     144,367       114,283     1,235,216      50%
                                ----------------------------------------------------------------------
INDIRECT COSTS:
  SALARIES
  SHOP SUPPLIES & SMALL TOOLS       1,500       1,500       1,500         1,500        18,000       1%
  DRAFTING -- CONTRACT                 --          --          --            --            --       0%
  SHIPPING & RECEIVING              3,000       3,000       3,000         3,000        36,000       2%
  CONTINGENCIES                     1,000       1,000       1,000         1,000        12,000       1%
                                ----------------------------------------------------------------------
                                    5,500       5,500       5,500         5,500        66,000       3%
                                ----------------------------------------------------------------------
TOTAL COST OF SALE                207,267     181,621     149,867       119,783     1,301,216      64%
                                ----------------------------------------------------------------------
GROSS MARGIN                      123,696     110,077      93,542        70,174       747,012      36%
                                ----------------------------------------------------------------------
SELLING EXPENSES:
  SALES - SALARIES                  7,500       7,500       7,500         7,500        90,000       4%
  ADVERTISING                       5,800       5,800       5,800         5,800        69,600       3%
  EMPLOYEE TRAVEL                   2,000       2,000       2,000         2,000        24,000       1%
  TELEPHONE                           500         500         500           500         6,000       0%
  AUTO OPERATING EXPENSES             500         500         500           500         6,000       0%
                                ----------------------------------------------------------------------
                                   16,300      16,300      16,300        16,300       195,600      10%
                                ----------------------------------------------------------------------
ADMINISTRATIVE EXPENSES:
  SALARIES - ADMINISTRATIVE         7,500       7,500       7,500         7,500        90,000       4%
  PAYROLL TAXES                     2,086       2,086       2,086         2,086        25,032       1%
  BONUS                             3,335      13,698      10,943         7,048        25,025       2%
  INSURANCE/GROUP HEALTH              750         750         750           750         9,000       0%
  INSURANCE                         1,000       1,000       1,000         1,000        12,000       1%
                                ----------------------------------------------------------------------
                                   14,671      25,034      22,279        18,384       171,057       8%
                                ----------------------------------------------------------------------
OTHER INCOME & EXPENSE
  DEPRECIATION EXPENSE               (250)       (250)       (250)         (250)       (3,000)      0%
  INTEREST EXPENSE                     --          --          --            --            --       0%
                                ----------------------------------------------------------------------
NET INCOME                         92,474      68,492      54,713        35,240       377,355      18%
                                ======================================================================
Convert to cash:
  add back depreciation               250         250         250           250         3,000
  inventory purchases
                                --------------------------------------------------------------
  net cash flow                    92,724      68,742      54,963        35,490       324,019
                                --------------------------------------------------------------
  accumulated cash               (230,925)   (162,183)   (107,219)      (71,729)
                                ==============================================================
  Payout on net profits            16,677
</TABLE>

(1)      because of increase volume standing inventory also increase beginning
         inventory is $164,766 and ending inventory would need to be $221,102

                                     Page 2
<PAGE>
<TABLE>
<CAPTION>
MIDLAND COMPRESSOR COMPANY      -------------------------------------------------------------------------------------------------

2002 projections                    One         Two       Three        Four       Five         Six        Seven       Eight
                                -------------------------------------------------------------------------------------------------
<S>                             <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>
REVENUE:
  SALES - COMPRESSOR UNITS/10   $   3,982   $   3,982   $       0   $       0   $   3,982   $   7,964   $  11,946   $  11,946
  SALES - COMPRESSOR UNITS/15   $   5,219   $   5,219   $   5,219   $       0   $  10,438   $  15,657   $  20,876   $  26,095
  SALES - COMPRESSOR UNITS/20   $   6,079   $   6,079   $       0   $       0   $   6,079   $  12,158   $  18,237   $  18,237
  SALES - COMPRESSOR UNITS/25   $  12,796   $  12,796   $   6,398   $   6,398   $  12,796   $  31,990   $  31,990   $  38,388
  SALES - COMPRESSOR UNITS/30   $  13,540   $  13,540   $   6,770   $   6,770   $  13,540   $  27,080   $  33,850   $  40,620
  SALES - COMPRESSOR UNITS/40   $   8,897   $   8,897   $   8,897   $       0   $   8,897   $   8,897   $  17,794   $  17,794
  SALES - COMPRESSOR UNITS/50   $  28,485   $  28,485   $   9,495   $   9,495   $  18,990   $  37,980   $  56,970   $  56,970
  SALES - COMPRESSOR UNITS/60   $  13,407   $  13,407   $       0   $       0   $  26,814   $  13,407   $  26,814   $  26,814
  SALES - COMPRESSOR UNITS/75   $  31,210   $  15,605   $  15,605   $  15,605   $  31,210   $  46,815   $  62,420   $  78,025
  SALES - COMPRESSOR UNITS/100  $  37,600   $  37,600   $  18,800   $  18,800   $  37,600   $  56,500   $  94,000   $  94,000
  SALES - PARTS                 $       0   $       0   $       0   $       0   $       0   $       0   $       0   $       0
                                -------------------------------------------------------------------------------------------------
                                $ 161,215     145,610      71,184      57,068     170,346     258,348     374,897      408,889
                                -------------------------------------------------------------------------------------------------
DIRECT COST:
  DIRECT LABOR                      2,860       2,860       2,860       2,860       2,860       2,860       2,860       2,860
  DIRECT MATERIAL - UNITS/10    $   2,750   $   2,750   $       0   $       0   $   2,750   $   5,500   $   8,250   $   8,250
  DIRECT MATERIAL - UNITS/15    $   2,852   $   2,852   $   2,852   $       0   $   5,704   $   8,556   $  11,408   $  14,260
  DIRECT MATERIAL - UNITS/20    $   3,250   $   3,250   $       0   $       0   $   3,250   $   6,500   $   9,750   $   9,750
  DIRECT MATERIAL - UNITS/25    $   6,654   $   6,654   $   3,327   $   3,327   $   6,654   $  16,635   $  16,635   $  19,962
  DIRECT MATERIAL - UNITS/30    $   7,439   $   7,439   $   3,719   $   3,719   $   7,439   $  14,877   $  18,597   $  22,316
  DIRECT MATERIAL - UNITS/40    $   5,735   $   5,735   $   5,735   $       0   $   5,735   $   5,735   $  11,470   $  11,470
  DIRECT MATERIAL - UNITS/50    $  14,433   $  14,433   $   4,811   $   4,811   $   9,622   $  19,244   $  28,866   $  28,866
  DIRECT MATERIAL - UNITS/60    $   9,085   $   9,985   $       0   $       0   $  18,170   $   9,085   $  18,170   $  18,170
  DIRECT MATERIAL - UNITS/75    $  17,010   $   8,505   $   8,505   $   8,505   $  17,010   $  25,515   $  34,020    $  42,525
  DIRECT MATERIAL - UNITS/100   $  18,854   $  18,854   $   9,427   $   9,427   $  18,854   $  28,281   $  47,136   $  47,136
  DIRECT MATERIAL - PARTS              --          --          --          --          --          --          --          --
  FREIGHT - in                      4,403       3,978       1,919       1,489       4,759       6,996      10,215      11,135
  WARRANTY                          2,642       2,387       1,151         894       2,856       4,198       6,129       6,681
                                -------------------------------------------------------------------------------------------------
                                   97,967      88,781      44,307      35,033     105,663     153,983     223,505     243,381
                                -------------------------------------------------------------------------------------------------
INDIRECT COSTS:
  SALARIES                          3,750       3,750       3,750       3,750       3,750       3,750       3,750       3,750
  SHOP SUPPLIES & SMALL TOOLS       1,500       1,500       1,500       1,500       1,500       1,500       1,500       1,500
  DRAFTING - CONTRACT                  --          --          --          --          --          --
  SHIPPING & RECEIVING              3,000       3,000       3,000       3,000       3,000       3,000       3,000       3,000
  CONTINGENCIES                     1,000       1,000       1,000       1,000       1,000       1,000       1,000       1,000
                                -------------------------------------------------------------------------------------------------
                                    9,250       9,250       9,250       9,250       9,250       9,250       9,250       9,250
                                -------------------------------------------------------------------------------------------------
TOTAL COST OF SALE                107,217      98,031      53,557      44,283     114,913     163,233     232,755     252,631
                                -------------------------------------------------------------------------------------------------
GROSS MARGIN                       53,998      47,579      17,627      12,785      55,433      95,115     142,142     156,258
                                -------------------------------------------------------------------------------------------------
SELLING EXPENSES:
  SALES - SALARIES                  7,500       7,500       7,500       7,500       7,500       7,500       7,500       7,500
  ADVERTISING                       5,800       5,800       5,800       5,800       5,800       5,800       5,800       5,800
  EMPLOYEE TRAVEL                   2,000       2,000       2,000       2,000       2,000       2,000       2,000       2,000
  TELEPHONE                           500         500         500         500         500         500         500         500
  AUTO OPERATING EXPENSES             500         500         500         500         500         500         500         500
                                -------------------------------------------------------------------------------------------------
                                   16,300      16,300      16,300      16,300      16,300      16,300      16,300      16,300
                                -------------------------------------------------------------------------------------------------
ADMINISTRATIVE EXPENSES:
  SALARIES - ADMINISTRATIVE         7,500       7,500       7,500       7,500       7,500       7,500       7,500       7,500
  PAYROLL TAXES                     2,461       2,461       2,461       2,461       2,461       2,461       2,461       2,461
  BONUS                             4,206       3,136      (1,856)     (2,663)      4,445      11,059      18,897      21,250
  INSURANCE/GROUP HEALTH            1,250       1,250       1,250       1,250       1,250       1,250       1,250       1,250
  INSURANCE                         1,000       1,000       1,000       1,000       1,000       1,000       1,000       1,000
                                   16,417      15,347      10,355       9,548      16,656      23,270      31,108      33,461
OTHER INCOME & EXPENSE
  DEPRECIATION EXPENSE               (250)       (250)       (250)       (250)       (250)       (250)       (250)       (250)
  INTEREST EXPENSE                     --          --          --          --          --          --          --          --
                                -------------------------------------------------------------------------------------------------
NET INCOME                         21,031      15,681      (9,278)    (13,313)     22,227      55,295      94,484     106,248
                                =================================================================================================
Convert to cash:
  add back depreciation               250         250         250         250         250         250         250         250
  inventory purchases
                                -------------------------------------------------------------------------------------------------
  net cash flow                    21,281      15,931      (9,028)    (13,063)     22,477      55,545      94,734     106,498
                                -------------------------------------------------------------------------------------------------
  accumulated cash                (50,448)    (34,517)    (43,545)    (56,608)    (34,131)     21,414     116,149     222,646
                                =================================================================================================
</TABLE>

<TABLE>
<CAPTION>
MIDLAND COMPRESSOR COMPANY      -------------------------------------------------------------
                                                                                                        SALE
2002 projections                   Nine         Ten       Eleven      Twelve           Ytd              PRICE
                                -------------------------------------------------------------
<S>                             <C>         <C>         <C>         <C>           <C>            <C>   <C>
REVENUE:
  SALES - COMPRESSOR UNITS/10   $   7,964   $   3,982   $   3,982   $     3,982   $    43,802      2%  $ 3,982
  SALES - COMPRESSOR UNITS/15   $  20,876   $  15,657   $  10,438   $    10,438   $    78,285      3%  $ 5,219
  SALES - COMPRESSOR UNITS/20   $  18,237   $  12,158   $   6,079   $     6,079   $    85,106      3%  $ 6,079
  SALES - COMPRESSOR UNITS/25   $  38,388   $  38,388   $  31,990   $    25,592   $   204,736      7%  $ 6,398
  SALES - COMPRESSOR UNITS/30   $  40,620   $  40,620   $  33,850   $    27,080   $   216,640      7%  $ 6,770
  SALES - COMPRESSOR UNITS/40   $  17,794   $   8,897   $   8,897   $     8,897   $   106,764      4%  $ 8,897
  SALES - COMPRESSOR UNITS/50   $  56,970   $  47,475   $  37,980   $    37,980   $   322,830     11%  $ 9,495
  SALES - COMPRESSOR UNITS/60   $  26,814   $  26,814   $  13,407   $    13,407   $   134,070      5%  $13,407
  SALES - COMPRESSOR UNITS/75   $  62,420   $  62,420   $  46,815   $    31,210   $   327,705     11%  $15,605
  SALES - COMPRESSOR UNITS/100  $  94,000   $  94,000   $  94,000   $    56,400   $   470,000     16%  $18,800
  SALES - PARTS                 $       0   $       0   $       0   $         0   $         0      0%
                                ---------------------------------------------------------------------
                                  384,083     350,411     287,438       221,065     2,890,554    100%
                                ---------------------------------------------------------------------
DIRECT COST:
  DIRECT LABOR                      2,860       2,860       2,860         2,860        34,320      1%
  DIRECT MATERIAL - UNITS/10    $   5,500   $   2,750   $   2,750   $     2,750        44,000      2%
  DIRECT MATERIAL - UNITS/15    $  11,408   $   8,556   $   5,704   $     5,704   $    79,856      3%
  DIRECT MATERIAL - UNITS/20    $   9,750   $   6,500   $   3,250   $     3,250   $    58,500      2%
  DIRECT MATERIAL - UNITS/25    $  19,962   $  19,962   $  16,635   $    13,250   $   149,715      5%
  DIRECT MATERIAL - UNITS/30    $  22,316   $  22,316   $  18,597   $    14,877   $   163,652      6%
  DIRECT MATERIAL - UNITS/40    $  11,470   $   5,735   $   5,735   $     5,735   $    80,291      3%
  DIRECT MATERIAL - UNITS/50    $  28,866   $  24,055   $  19,244   $    19,244   $   216,495      7%
  DIRECT MATERIAL - UNITS/60    $  18,170   $  18,170   $   9,085   $     9,085   $   136,273      5%
  DIRECT MATERIAL - UNITS/75    $  34,020   $  34,020   $  25,515   $    17,010   $   272,158      9%
  DIRECT MATERIAL - UNITS/100   $  47,136   $  47,136   $  47,136   $    28,281   $   267,657     13%
  DIRECT MATERIAL - PARTS              --          --          --            --   $         0      0%
  FREIGHT - in                     10,430       9,460       7,683         5,962   $    78,430      3%
  WARRANTY                          6,258       5,676       4,610         3,577   $    47,058      2%
                                ---------------------------------------------------------------------
                                  228,145     207,195     168,802       131,644     1,728,405     60%
                                ---------------------------------------------------------------------
INDIRECT COSTS:
  SALARIES                          3,750       3,750       3,750         3,750        45,000      2%
  SHOP SUPPLIES & SMALL TOOLS       1,500       1,500       1,500         1,500        18,000      1%
  DRAFTING - CONTRACT                                                                      --      0%
  SHIPPING & RECEIVING              3,000       3,000       3,000         3,000        36,000      1%
  CONTINGENCIES                     1,000       1,000       1,000         1,000        12,000      0%
                                ---------------------------------------------------------------------
                                    9,250       9,250       9,250         9,250       111,000      4%
                                ---------------------------------------------------------------------
TOTAL COST OF SALE                237,395     216,445     178,052       140,894     1,839,405     64%
                                ---------------------------------------------------------------------
GROSS MARGIN                      146,688     133,966     109,386        80,171     1,051,149     36%
                                ---------------------------------------------------------------------
SELLING EXPENSES:
  SALES - SALARIES                  7,500       7,500       7,500         7,500        90,000      3%
  ADVERTISING                       5,800       5,800       5,800         5,800        69,600      2%
  EMPLOYEE TRAVEL                   2,000       2,000       2,000         2,000        24,000      1%
  TELEPHONE                           500         500         500           500         6,000      0%
  AUTO OPERATING EXPENSES             500         500         500           500         6,000      0%
                                ---------------------------------------------------------------------
                                   16,300      16,300      16,300        16,300       195,600      7%
                                ---------------------------------------------------------------------
ADMINISTRATIVE EXPENSES:
  SALARIES - ADMINISTRATIVE         7,500       7,500       7,500         7,500        90,000      3%
  PAYROLL TAXES                     2,461       2,461       2,461         2,461        29,532      1%
  BONUS                            19,654      17,534      13,437         8,568       117,669      4%
  INSURANCE/GROUP HEALTH            1,250       1,250       1,250         1,250        15,000      1%
  INSURANCE                         1,000       1,000       1,000         1,000        12,000      0%
                                   31,865      29,745      25,648        20,779       264,201      9%
OTHER INCOME & EXPENSE
  DEPRECIATION EXPENSE               (250)       (250)       (250)         (250)       (3,000)     0%
  INTEREST EXPENSE                     --          --          --            --            --      0%
                                ---------------------------------------------------------------------
NET INCOME                         98,272      87,671      67,187        42,842       588,347     20%
                                =====================================================================
Convert to cash:
  add back depreciation               250         250         250           250
  inventory purchases
                                -------------------------------------------------------------
  net cash flow                    98,522      87,921      67,437        43,092
                                -------------------------------------------------------------
  accumulated cash                321,169     409,089     476,527       519,618
                                =============================================================
</TABLE>

                                     Page 3
<PAGE>
<TABLE>
<CAPTION>
MIDLAND COMPRESSOR COMPANY      ------------------------------------------------------------------------------------------------

2003 projections                    One         Two        Three       Four        Five        Six        Seven       Eight
                                ------------------------------------------------------------------------------------------------
<S>                             <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>
REVENUE:
  SALES - COMPRESSOR UNITS/10   $   3,982   $   3,982   $   3,982   $   3,982   $   7,964   $   7,964   $  11,946   $  11,946
  SALES - COMPRESSOR UNITS/15   $   5,219   $   5,219   $   5,219   $   5,219   $  10,438   $  15,657   $  20,876   $  26,095
  SALES - COMPRESSOR UNITS/20   $   6,079   $   6,079   $   6,079   $   6,079   $   6,079   $  12,158   $  18,237   $  24,316
  SALES - COMPRESSOR UNITS/25   $  12,796   $  12,796   $   6,398   $  12,796   $  25,592   $  31,990   $  38,388   $  44,786
  SALES - COMPRESSOR UNITS/30   $  13,540   $  13,540   $   6,770   $  20,310   $  27,080   $  40,620   $  47,390   $  54,160
  SALES - COMPRESSOR UNITS/40   $   8,897   $   8,897   $   8,897   $   8,897   $   8,897   $  17,794   $  26,691   $  17,794
  SALES - COMPRESSOR UNITS/50   $  28,485   $  18,990   $   9,495   $  28,485   $  28,485   $  47,475   $  66,465   $  75,960
  SALES - COMPRESSOR UNITS/60   $  13,407   $  13,407   $  13,407   $  13,407   $  13,407   $  13,407   $  26,814   $  26,814
  SALES - COMPRESSOR UNITS/75   $  31,210   $  15,605   $  15,605   $  31,210   $  46,815   $  62,420   $  78,025   $  93,630
  SALES - COMPRESSOR UNITS/100  $  37,600   $ 18.,800   $  18,800   $  37,600   $  56,400   $  75,200   $ 112,800   $ 131,600
  SALES -- PARTS                       --          --          --          --          --          --          --          --
                                ------------------------------------------------------------------------------------------------
                                  161,215     117,315      94,652     167,985     231,157     324,685     447,632     507,101
                                ------------------------------------------------------------------------------------------------
DIRECT COST:
  DIRECT LABOR                  $   2,860   $   2,860   $   2,860   $   2,860   $   2,860   $   2,860   $   2,860   $   2,860
  DIRECT MATERIAL - UNITS/10    $   2,750   $   2,750   $   2,750   $   2,750   $   5,500   $   5,500   $   8,250   $   8,250
  DIRECT MATERIAL - UNITS/15    $   2,852   $   2,852   $   2,852   $   2,852   $   5,704   $   8,556   $  11,408   $  14,260
  DIRECT MATERIAL - UNITS/20    $   3,250   $   3,250   $   3,250   $   3,250   $   3,250   $   6,500   $   9,750   $  13,000
  DIRECT MATERIAL - UNITS/25    $   6,654   $   6,654   $   3,327   $   6,654   $  13,308   $  16,635   $  19,962   $  23,289
  DIRECT MATERIAL - UNITS/30    $   7,439   $   7,439   $   3,719   $  11,158   $  14,877   $  22,316   $  26,036   $  29,755
  DIRECT MATERIAL - UNITS/40    $   5,735   $   5,735   $   5,735   $   5,735   $   5,735   $  11,470   $  17,205   $  11,470
  DIRECT MATERIAL - UNITS/50    $  14,433   $   9,622   $   4,811   $  14,433   $  14,433   $  24,055   $  33,677   $  38,488
  DIRECT MATERIAL - UNITS/60    $   9,085   $   9,085   $   9,085   $   9,085   $   9,085   $   9,085   $  18,170   $  18,170
  DIRECT MATERIAL - UNITS/75    $  17,010   $   8,505   $   8,505   $  17,010   $  25,515   $  34,020   $  42,525   $  51,030
  DIRECT MATERIAL - UNITS/100   $  18,654   $   9,427   $   9,427   $  18,854   $  28,281   $  37,708   $  56,563   $  65,990
  DIRECT MATERIAL - PARTS              --          --          --          --          --          --          --          --
  FREIGHT - in                  $   4,403   $   3,266   $   2,673   $   4,589   $   6,284   $   8,792   $  12,177   $  13,685
  WARRANTY                      $   2,642   $   1,960   $   1,604   $   2,753   $   3,771   $   5,275   $   7,306   $   8,211
                                ------------------------------------------------------------------------------------------------
                                   97,967      73,404      60,598     101,984     136,604     192,773     265,888     298,457
                                ------------------------------------------------------------------------------------------------
INDIRECT COSTS:
  SALARIES                      $   3,750   $   3,750   $   3,750   $   3,750   $   3,750   $   3,750   $   3,750   $   3,750
  SHOP SUPPLIES & SMALL TOOLS   $   1,500   $   1,500   $   1,500   $   1,500   $   1,500   $   1,500   $   1,500   $   1,500
  DRAFTING -- CONTRACT                 --          --          --          --          --          --          --          --
  SHIPPING & RECEIVING          $   3,000   $   3,000   $   3,000   $   3,000   $   3,000   $   3,000   $   3,000   $   3,000
  CONTINGENCIES                 $   1,000   $   1,960   $   1,000   $   1,000   $   1,000   $   1,000   $   1,000   $   1,000
                                ------------------------------------------------------------------------------------------------
                                    9,250       9,250       9,250       9,250       9,250       9,250       9,250       9,250
                                ------------------------------------------------------------------------------------------------
TOTAL COST OF SALE                107,217      82,654      58,848     111,234     147,854     202,023     275,138     307,707
                                ------------------------------------------------------------------------------------------------
GROSS MARGIN                       53,998      34,661      24,804      56,751      83,303     122,662     172,494     199,394
                                ------------------------------------------------------------------------------------------------
SELLING EXPENSES:
  SALES - SALARIES              $   7,500   $   7,500   $   7,500   $   7,500   $   7,500   $   7,500   $   7,500   $   7,500
  ADVERTISING                   $   5,800   $   5,800   $   5,800   $   5,800   $   5,800   $   5,800   $   5,800   $   5,800
  EMPLOYEE TRAVEL               $   2,000   $   2,000   $   2,000   $   2,000   $   2,000   $   2,000   $   2,000   $   2,000
  TELEPHONE                     $     500   $     500   $     500   $     500   $     500   $     500   $     500   $     500
  AUTO OPERATING EXPENSES       $     500   $     500   $     500   $     500   $     500   $     500   $     500   $     500
                                ------------------------------------------------------------------------------------------------
                                   16,300      16,300      16,300      16,300      16,300      16,300      16,300      16,300
                                ------------------------------------------------------------------------------------------------
ADMINISTRATIVE EXPENSES:
  SALARIES - ADMINISTRATIVE     $   7,500   $   7,500   $   7,500   $   7,500   $   7,500   $   7,500   $   7,500   $  7,.500
  PAYROLL TAXES                 $   2,461   $   5,800   $   2,461   $   2,461   $   2,461   $   2,461   $   2,461   $   2,461
  BONUS                         $   4,123   $   2,000   $    (743)  $   4,582   $   9,007   $  15,567   $  23,872   $  28,355
  INSURANCE/GROUP HEALTH        $   1,250         500   $   1,250   $   1,250   $   1,250   $   1,250   $   1,250   $   1,250
  INSURANCE                     $   1,500         500   $   1,500   $   1,500   $   1,500   $   1,500   $   1,500   $   1,500
                                ------------------------------------------------------------------------------------------------
                                   16,834      13,611      11,968      17,293      21,718      28,278      36,583      41,066
                                ------------------------------------------------------------------------------------------------
OTHER INCOME & EXPENSE
  DEPRECIATION EXPENSE          $    (250)  $    (250)  $    (250)  $    (250)  $    (250)  $    (250)  $    (250)  $    (250)
  INTEREST EXPENSE                     --          --          --          --          --          --          --          --
                                ------------------------------------------------------------------------------------------------
NET INCOME                         20,614       4,500      (3,714)     22,909      45,035      77,834     119,360     141,777
                                ================================================================================================
Convert to cash:
  add back depreciation         $     250   $     250   $     250   $     250   $     250   $     250   $     250   $     250
  inventory purchases
                                ------------------------------------------------------------------------------------------------
  net cash flow                    20,864       4,750      (3,464)     23,159     564,927      78,084     119,610     142,027
                                ------------------------------------------------------------------------------------------------
  accumulated cash                540,483     545,232     541,768     564,927     610,212     688,296     807,906     949,934
                                ================================================================================================
</TABLE>

<TABLE>
<CAPTION>
MIDLAND COMPRESSOR COMPANY      --------------------------------------------------------------------
                                                                                                               SALE
2003 projections                    Nine           Ten         Eleven        Twelve         Ytd                PRICE
                                --------------------------------------------------------------------
<S>                             <C>           <C>           <C>           <C>           <C>             <C>   <C>
REVENUE:
  SALES - COMPRESSOR UNITS/10   $     7,964   $     7,964   $     7,964   $     7,964   $    83,622       2%  $ 3,982
  SALES - COMPRESSOR UNITS/15   $    20,876   $    20,876   $    10,438   $    10,438   $   156,570       4%  $ 5,219
  SALES - COMPRESSOR UNITS/20   $    18,237   $    12,158   $    12,158   $    12,158   $   139,817       4%  $ 6,079
  SALES - COMPRESSOR UNITS/25   $    51,184   $    47,786   $    38,388   $    31,990   $   351,890      10%  $ 6,398
  SALES - COMPRESSOR UNITS/30   $    54,160   $    47,390   $    40,620   $    40,620   $   406,200      11%  $ 6,770
  SALES - COMPRESSOR UNITS/40   $    17,794   $    17,794   $    17,794   $     8,897   $   169,043       5%  $ 8,897
  SALES - COMPRESSOR UNITS/50   $    75,960   $    75,960   $    66,465   $    56,970   $   579,195      16%  $ 9,495
  SALES - COMPRESSOR UNITS/60   $    28,814   $    26,814   $    13,407   $    13,407   $   214,512       6%  $13,407
  SALES - COMPRESSOR UNITS/75   $    78,025   $    78,025   $    62,400   $    46,815   $   639,805      17%  $15,605
  SALES - COMPRESSOR UNITS/100  $   131,600   $   131,600   $   112,800   $    94,000   $   958,800      26%  $18,800
  SALES -- PARTS                         --            --            --            --            --       0%
                                ----------------------------------------------------------------------------
                                    482,614       483,367       382,454       319,277     3,699,454     100%
                                ----------------------------------------------------------------------------
DIRECT COST:
  DIRECT LABOR                  $     2,860   $     2,860   $     2,860   $     2,860   $    34,320       1%
  DIRECT MATERIAL - UNITS/10    $     5,500   $     5,500   $     5,500   $     2,750   $    57,750       2%
  DIRECT MATERIAL - UNITS/15    $    11,408   $    11,408   $     5,704   $     5,704   $    85,560       2%
  DIRECT MATERIAL - UNITS/20    $     9,750   $     6,500   $     6,500   $     6,500   $    74,750       2%
  DIRECT MATERIAL - UNITS/25    $    26,616   $    23,289   $    19,962   $    16,635   $   182,985       5%
  DIRECT MATERIAL - UNITS/30    $    29,755   $    26,036   $    22,316   $    22,316   $   223,162       6%
  DIRECT MATERIAL - UNITS/40    $    11,470   $    11,470   $    11,470   $     5,735   $   108,967       3%
  DIRECT MATERIAL - UNITS/50    $    38,488   $    38,488   $    33,677   $    28,866   $   293,471       8%
  DIRECT MATERIAL - UNITS/60    $    18,170   $    18,170   $     9,085   $     9,085   $   145,358       4%
  DIRECT MATERIAL - UNITS/75    $    42,525   $    42,525   $    34,020   $    25,515   $   348,703       9%
  DIRECT MATERIAL - UNITS/100   $    65,990   $    65,990   $    56,563   $    47,136   $   480,782      13%
  DIRECT MATERIAL - PARTS                --            --            --            --            --       0%
  FREIGHT - in                  $    12,984   $    12,469   $    10,240   $     8,512   $   100,074       3%
  WARRANTY                      $     7,790   $     7,481   $     6,144   $     5,107   $    60,045       2%
                                ----------------------------------------------------------------------------
                                    283,305       272,185       224,040       186,721     2,195,926      59%
                                ----------------------------------------------------------------------------
INDIRECT COSTS:
  SALARIES                      $     3,750   $     3,750   $     3,750   $     3,750   $    45,000       1%
  SHOP SUPPLIES & SMALL TOOLS   $     1,500   $     1,500   $     1,500   $     1,500   $    18,000       0%
  DRAFTING -- CONTRACT                   --            --            --            --            --       0%
  SHIPPING & RECEIVING          $     3,000   $     3,000   $     3,000   $     3,000   $    36,000       1%
  CONTINGENCIES                 $     1,000   $     1,000   $     1,000   $     1,000   $    12,000       0%
                                ----------------------------------------------------------------------------
                                      9,250         9,250         9,250         9,250       111,000       3%
                                ----------------------------------------------------------------------------
TOTAL COST OF SALE                  292,555       281,435       233,290       195,971     2,306,926      62%
                                ----------------------------------------------------------------------------
GROSS MARGIN                        190,059       181,932       149,164       123,306     1,392,528      38%
                                ----------------------------------------------------------------------------
SELLING EXPENSES:
  SALES - SALARIES              $     7,500   $     7,500   $     7,500   $     7,500   $    90,000       2%
  ADVERTISING                   $     5,800   $     5,800   $     5,800   $     5,800   $    69,600       2%
  EMPLOYEE TRAVEL               $     2,000   $     2,000   $     2,000   $     2,000   $    24,000       1%
  TELEPHONE                     $       500   $       500   $       500   $       500   $     6,000       0%
  AUTO OPERATING EXPENSES       $       500   $       500   $       500   $       500   $     6,000       0%
                                ----------------------------------------------------------------------------
                                     16,300        16,300        16,300        16,300       195,600       5%
                                ----------------------------------------------------------------------------
ADMINISTRATIVE EXPENSES:
  SALARIES - ADMINISTRATIVE     $     7,500   $     7,500   $     7,500   $     7,500   $   90,000        2%
  PAYROLL TAXES                 $     2,461   $     2,461   $     2,461   $     2,461   $    29,532       1%
  BONUS                         $    26,800   $    25,445   $    19,984   $    15,674   $   173,566       5%
  INSURANCE/GROUP HEALTH        $     1,250   $     1,250   $     1,250   $     1,250   $    15,000       0%
  INSURANCE                     $     1,500   $     1,500   $     1,500   $     1,500   $    18,000       0%
                                ----------------------------------------------------------------------------
                                     39,511        38,156        32,695        28,385       326,098       9%
                                ----------------------------------------------------------------------------
OTHER INCOME & EXPENSE
  DEPRECIATION EXPENSE          $      (250)  $      (250)  $      (250)  $      (250)  $    (3,000)      0%
  INTEREST EXPENSE                       --            --            --            --                     0%
                                ----------------------------------------------------------------------------
NET INCOME                          133,998       127,226        99,919        78,371       867,830      23%
                                ============================================================================
Convert to cash:
  add back depreciation         $       250   $       250   $       250   $       250
  inventory purchases
                                --------------------------------------------------------------------
  net cash flow                     132,248       127,476       100,169        78,621
                                --------------------------------------------------------------------
  accumulated cash                1,084,182     1,211,658     1,311,827     1,390,448
                                ====================================================================
</TABLE>

                                     Page 4
<PAGE>
<TABLE>
<CAPTION>
SALES IN UNITS
year 2001                                                           -----
                                 ONE   TWO   THREE   FOUR    FIVE    SIX     SEVEN   EIGHT    NINE     TEN    ELEVEN   TWELVE    YTD
                                                                    -----
<S>                              <C>   <C>   <C>     <C>     <C>    <C>      <C>     <C>      <C>      <C>    <C>      <C>       <C>
  SALES - COMPRESSOR UNITS\10                           0       1      1         1       2       2       2         1        1     11
  SALES - COMPRESSOR UNITS\15                           0       1      2         2       2       3       2         2        1     15
  SALES - COMPRESSOR UNITS\20                           1       1      1         1       2       2       2         2        2     14
  SALES - COMPRESSOR UNITS\25                           2       3      3         4       4       4       5         4        3     32
  SALES - COMPRESSOR UNITS\30            2       1      1       3      3         4       4       4       5         5        3     32
  SALES - COMPRESSOR UNITS\40                           0              1         2       2       3       2         1        1     12
  SALES - COMPRESSOR UNITS\50      2     1       1      2       3      3         4       4       4       5         5        4     34
  SALES - COMPRESSOR UNITS\60                           0                        1       2       3       2         1        1     10
  SALES - COMPRESSOR UNITS\75                           1       1      2         2       4       4       3         2        2     21
  SALES - COMPRESSOR UNITS\100                          2       2      2         3       4       4       3         3        2     25
  SALES - PARTS                                                                                                                    0
                                 ---------------------------------------------------------------------------------------------------
                                   2     3       2      9      15     18        24      30      33      31        26       20    213
                                 ---------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
SALES IN UNITS
year 2002                                                           -----
                                 ONE   TWO   THREE   FOUR    FIVE    SIX     SEVEN   EIGHT    NINE     TEN    ELEVEN   TWELVE    YTD
                                                                    -----
<S>                              <C>   <C>   <C>     <C>     <C>    <C>      <C>     <C>      <C>      <C>    <C>      <C>       <C>
  SALES - COMPRESSOR UNITS\10      1     1       0      0       1      2         3       3       2       1         1        1     14
  SALES - COMPRESSOR UNITS\15      2     2       2      0       2      3         4       5       4       3         2        2     25
  SALES - COMPRESSOR UNITS\20      1     1       0      0       1      2         3       3       3       2         1        1     16
  SALES - COMPRESSOR UNITS\25      2     2       1      1       2      5         5       6       6       6         5        4     40
  SALES - COMPRESSOR UNITS\30      2     2       1      1       2      4         5       6       6       6         5        4     39
  SALES - COMPRESSOR UNITS\40      1     1       1      0       1      1         2       2       2       1         1        1     11
  SALES - COMPRESSOR UNITS\50      3     3       1      1       2      4         6       6       6       5         4        4     38
  SALES - COMPRESSOR UNITS\60      1     1       0      0       2      1         2       2       2       2         1        1     13
  SALES - COMPRESSOR UNITS\75      2     1       1      1       2      3         4       5       4       4         3        2     28
  SALES - COMPRESSOR UNITS\100     2     2       1      1       2      3         5       5       5       5         5        3     34
  SALES - PARTS                                                                                                                    0
                                 ---------------------------------------------------------------------------------------------------
                                  16    15       7      5      17     28        39      43      40      35        28       23    296
                                 ---------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
SALES IN UNITS
year 2003                                                           -----
                                 ONE   TWO   THREE   FOUR    FIVE    SIX     SEVEN   EIGHT    NINE     TEN    ELEVEN   TWELVE    YTD
                                                                    -----
<S>                              <C>   <C>   <C>     <C>     <C>    <C>      <C>     <C>      <C>      <C>    <C>      <C>       <C>
  SALES - COMPRESSOR UNITS\10      1     1       1      1       2      2         3       3       2       2         2        1     18
  SALES - COMPRESSOR UNITS\15      1     1       1      1       2      3         4       5       4       4         2        2     27
  SALES - COMPRESSOR UNITS\20      1     1       1      1       1      2         3       4       3       2         2        2     20
  SALES - COMPRESSOR UNITS\25      2     2       1      2       4      5         6       7       8       7         6        5     50
  SALES - COMPRESSOR UNITS\30      2     2       1      3       4      6         7       8       8       7         6        6     55
  SALES - COMPRESSOR UNITS\40      1     1       1      1       1      2         3       2       2       2         2        1     16
  SALES - COMPRESSOR UNITS\50      3     2       1      3       3      5         7       8       8       8         7        6     55
  SALES - COMPRESSOR UNITS\60      1     1       1      1       1      1         2       2       2       2         1        1     13
  SALES - COMPRESSOR UNITS\75      2     1       1      2       3      4         5       6       5       5         4        3     37
  SALES - COMPRESSOR UNITS\100     2     1       1      2       3      4         6       7       7       7         6        5     47
  SALES - PARTS                                                                                                                    0
                                 ---------------------------------------------------------------------------------------------------
                                  16    13      10     17      24     34        46      52      49      46        38       32    377
                                 ---------------------------------------------------------------------------------------------------
                                                                                                                                 866
</TABLE>

                                     Page 5
<PAGE>
DIRECT MATERIAL COST AS A PERCENTAGE OF SALES

<TABLE>
<S>                        <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
DIRECT MATERIAL-UNITS\10   69.06%  69.06%  69.06%  69.06%  69.06%  69.06%  69.06%  69.06%  69.06%  69.06%  69.06%  69.06%
DIRECT MATERIAL-UNITS\15   54.65%  54.65%  54.65%  54.65%  54.65%  54.65%  54.65%  54.65%  54.65%  54.65%  54.65%  54.65%
DIRECT MATERIAL-UNITS\20   53.46%  53.46%  53.46%  53.46%  53.46%  53.46%  53.46%  53.46%  53.46%  53.46%  53.46%  53.46%
DIRECT MATERIAL-UNITS\25   52.00%  52.00%  52.00%  52.00%  52.00%  52.00%  52.00%  52.00%  52.00%  52.00%  52.00%  52.00%
DIRECT MATERIAL-UNITS\30   54.94%  54.94%  54.94%  54.94%  54.94%  54.94%  54.94%  54.94%  54.94%  54.94%  54.94%  54.94%
DIRECT MATERIAL-UNITS\40   61.23%  61.23%  61.23%  61.23%  61.23%  61.23%  61.23%  61.23%  61.23%  61.23%  61.23%  61.23%
DIRECT MATERIAL-UNITS\50   50.67%  50.67%  50.67%  50.67%  50.67%  50.67%  50.67%  50.67%  50.67%  50.67%  50.67%  50.67%
DIRECT MATERIAL-UNITS\60   63.88%  63.88%  63.88%  63.88%  63.88%  63.88%  63.88%  63.88%  63.88%  63.88%  63.88%  63.88%
DIRECT MATERIAL-UNITS\75   54.50%  54.50%  54.50%  54.50%  54.50%  54.50%  54.50%  54.50%  54-50%  54.50%  54.50%  54.50%
DIRECT MATERIAL-UNITS\100  50.14%  50.14%  50.14%  50.14%  50.14%  50.14%  50.14%  50.14%  50.14%  50.14%  50.14%  50.14%
</TABLE>

                                     Page 6
<PAGE>
MIDLAND COMPRESSOR COMPANY BASIC ASSUMPTIONS

1.       Sales are tied to the quantity table on page 5.

2.       Direct material cost have a range from 69.6% for the 10 HP unit to
         50.14% of rhte 100 HP unit. See table on page 4.

3.       At the beginning of project personnel will consist of: one salesman,
         one design engineer and one shop hand. Beginning in January 2001 we
         will add a shipping and receiving clerk and in January 2002 we will add
         a second shop hand.

4.       An addition for office space will be a part of initial startup cost. We
         have included $30,000 dollar for this expenditure.

5.       A bonus amount has been included which is calculated and accrued based
         upon the agreements with Mark Clardy and Alan Kurus. The Bonus
         calculated in the attached spreadsheet represents 20% of the net
         income. This excludes expenditures for inventory and office addition.
         In this scenario payout occurs in Sept 2001.

6.       The initial inventory expenditure is $164,766. Inventory Levels will
         fluctuate in relation to production, therefore the amount of inventory
         on hand will increase over time. We have added an additional amount in
         June 2001 to compensate for this increase. A substantial line of credit
         will be needed to fund this fluctuation in inventory. For instance
         inventory level for the year 2001 will range from $600,616 in Sept 20
         $22,1102 by year end.

7.       Total capital outlay for this project is $480,281 as outlined below.
         But payout is based upon recovery of operating losses only of $285,515.

<TABLE>
<S>                                                 <C>
                    operating loss thru March 2001  $285,515
                    inventory expenditure           $164,766
                    property improvements           $ 30,000
                                                    --------
                    capital outlay                  $480,281
                                                    ========
</TABLE>

                                     Page 7

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