Document:

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                                  EXHIBIT 10.1
                            STOCK PURCHASE AGREEMENT

        This Stock Purchase Agreement ("Agreement") is made effective as of
November 30, 2001, by Clayton Lau, an individual resident in Harris County,
Texas ("BUYER") and Mountain Compressed Air, Inc., a Texas
corporation("SELLER").

                                 R E C I T A L S

        Seller desires to sell, and Buyer desires to purchase, all of the issued
and outstanding shares (the "Shares") of capital stock of Houston Dynamic
Service, Inc., a Texas corporation (the "Company"), for the consideration and on
the terms set forth in this Agreement.

                                    AGREEMENT

        The parties, intending to be legally bound, agree as follows:

        1. DEFINITIONS

        For purposes of this Agreement, the following terms have the meanings
specified or referred to in this Section 1:

        "ACQUIRED COMPANY"--the Company.

        "BEST EFFORTS"--the efforts that a prudent Person desirous of achieving
        a result would use in similar circumstances to ensure that such result
        is achieved as expeditiously as possible.

        "BREACH"--a "Breach" of a representation, warranty, covenant,
        obligation, or other provision of this Agreement or any instrument
        delivered pursuant to this Agreement will be deemed to have occurred if
        there is or has been (a) any inaccuracy in or breach of, or any failure
        to perform or comply with, such representation, warranty, covenant,
        obligation, or other provision, or (b) any claim (by any Person) or
        other occurrence or circumstance that is or was inconsistent with such
        representation, warranty, covenant, obligation, or other provision, and
        the term "Breach" means any such inaccuracy, breach, failure, claim,
        occurrence, or circumstance.

        "BUYER"--as defined in the first paragraph of this Agreement.

        "CLOSING"--as defined in Section 2.3.

        "CLOSING DATE"--the date and time as of which the Closing actually takes
        place.

        "COMPANY"--as defined in the Recitals of this Agreement.

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        "CONSENT"--any approval, consent, ratification, waiver, or other
        authorization (including any Governmental Authorization).

        "CONTEMPLATED TRANSACTIONS"--all of the transactions contemplated by
        this Agreement, including:

        (a)     the sale of the Shares by Seller to Buyer;

        (b)     the execution, delivery, and performance of the Promissory Note
                and the Amendment;

        (c)     the performance by Buyer and Seller of their respective
                covenants and obligations under this Agreement; and

        (a)     Buyer's acquisition and ownership of the Shares and exercise of
                control over the Company.

        "CONTRACT"--any agreement, contract, obligation, promise, or undertaking
        (whether written or oral and whether express or implied) that is legally
        binding.

        "ENCUMBRANCE"--any charge, claim, community property interest,
        condition, equitable interest, lien, option, pledge, security interest,
        right of first refusal, or restriction of any kind, including any
        restriction on use, voting, transfer, receipt of income, or exercise of
        any other attribute of ownership.

        "FACILITIES"--any real property, leaseholds, or other interests
        currently or formerly owned or operated by the Company and any
        buildings, plants, structures, or equipment (including motor vehicles,
        tank cars, and rolling stock) currently or formerly owned or operated by
        the Company.

        "GOVERNMENTAL BODY"--any:

        (d)     nation, state, county, city, town, village, district, or other
                jurisdiction of any nature;

        (a)     federal, state, local, municipal, foreign, or other government;

        (a)     governmental or quasi-governmental authority of any nature
                (including any governmental agency, branch, department,
                official, or entity and any court or other tribunal);

        (a)     multi-national organization or body; or

        (a)     body exercising, or entitled to exercise, any administrative,
                executive, judicial, legislative, police, regulatory, or taxing
                authority or power of any nature.

        "KNOWLEDGE"--an individual will be deemed to have "Knowledge" of a
        particular fact or other matter if:

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        (b)     such individual is actually aware of such fact or other matter;
                or

        (c)     a prudent individual could be expected to discover or otherwise
                become aware of such fact or other matter in the course of
                conducting a reasonably comprehensive investigation concerning
                the existence of such fact or other matter.

        A Person (other than an individual) will be deemed to have "Knowledge"
        of a particular fact or other matter if any individual who is serving,
        or who has at any time served, as a director, officer, partner,
        executor, or trustee of such Person (or in any similar capacity) has, or
        at any time had, Knowledge of such fact or other matter.

        "LEGAL REQUIREMENT"--any federal, state, local, municipal, foreign,
        international, multinational, or other administrative order,
        constitution, law, ordinance, principle of common law, regulation,
        statute, or treaty.

        "ORDER"--any award, decision, injunction, judgment, order, ruling,
        subpoena, or verdict entered, issued, made, or rendered by any court,
        administrative agency, or other Governmental Body or by any arbitrator.

        "ORDINARY COURSE OF BUSINESS"--an action taken by a Person will be
        deemed to have been taken in the "Ordinary Course of Business" only if:

        (b)     such action is consistent with the past practices of such Person
                and is taken in the ordinary course of the normal day-to-day
                operations of such Person;

        (c)     such action is not required to be authorized by the board of
                directors of such Person (or by any Person or group of Persons
                exercising similar authority); and

        (d)     such action is similar in nature and magnitude to actions
                customarily taken, without any authorization by the board of
                directors (or by any Person or group of Persons exercising
                similar authority), in the ordinary course of the normal
                day-to-day operations of other Persons that are in the same line
                of business as such Person.

        "ORGANIZATIONAL DOCUMENTS"--(a) the articles or certificate of
        incorporation and the bylaws of a corporation; (b) the partnership
        agreement and any statement of partnership of a general partnership; (c)
        the limited partnership agreement and the certificate of limited
        partnership of a limited partnership; (d) any charter or similar
        document adopted or filed in connection with the creation, formation, or
        organization of a Person; and (e) any amendment to any of the foregoing.

        "PERSON"--any individual, corporation (including any non-profit
        corporation), general or limited partnership, limited liability company,
        joint venture, estate, trust, association, organization, labor union, or
        other entity or Governmental Body.

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        "PROCEEDING"--any action, arbitration, audit, hearing, investigation,
        litigation, or suit (whether civil, criminal, administrative,
        investigative, or informal) commenced, brought, conducted, or heard by
        or before, or otherwise involving, any Governmental Body or arbitrator.

        "PROMISSORY NOTE"--as defined in Section 2.4(b)(ii).

        "REPRESENTATIVE"--with respect to a particular Person, any director,
        officer, employee, agent, consultant, advisor, or other representative
        of such Person, including legal counsel, accountants, and financial
        advisors.

        "SELLER"--as defined in the first paragraph of this Agreement.

        "SHARES"--as defined in the Recitals of this Agreement.

        "THREATENED"--a claim, Proceeding, dispute, action, or other matter will
        be deemed to have been "Threatened" if any demand or statement has been
        made (orally or in writing) or any notice has been given (orally or in
        writing), or if any other event has occurred or any other circumstances
        exist, that would lead a prudent Person to conclude that such a claim,
        Proceeding, dispute, action, or other matter is likely to be asserted,
        commenced, taken, or otherwise pursued in the future.

        3. SALE AND TRANSFER OF SHARES; CLOSING

                2.1 SHARES

        Subject to the terms and conditions of this Agreement, at the Closing,
Seller will sell and transfer the Shares to Buyer, and Buyer will purchase the
Shares from Seller.

                2.2 PURCHASE PRICE

        The purchase price (the "Purchase Price") for the Shares will be: (a)
$930,000.00, (b) the accounts receivable of the Company which shall total at
least $530,000.00 and which are listed on Exhibit "A" hereto, and (c) any excess
cash of the Company over $100,000.00 on the Closing Date.

                2.3 CLOSING

        The purchase and sale (the "Closing") provided for in this Agreement
will take place at the offices of Buyer's counsel at the offices of Wilson,
Cribbs, Goren & Flaum, P.C. 440 Louisiana, Suite 2200, Houston, Texas, at 10:00
a.m. (local time) on December 4, 2001, or at such other time and place as the
parties may agree. Subject to the provisions of Section 9, failure to consummate
the purchase and sale provided for in this Agreement on the date and time and at
the place determined pursuant to this Section 2.3 will not result in the
termination of this Agreement and will not relieve any party of any obligation
under this Agreement.

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                2.4 CLOSING OBLIGATIONS

        At the Closing:

        (a) Seller will deliver to Buyer:

               (i) certificates representing the Shares, duly endorsed for
        transfer to Buyer;

               (ii) the Amendments to Key Employee and Severance Agreements
        between the Company and Clayton Lau and Bonita J. Witt in the form of
        Exhibit "B", (collectively, the "Amendments");

               (iii) Seller will retain all the accounts receivable (which shall
        total at least $530,000.00) as listed on Exhibit "A" hereto;

               (iv) Seller will retain the accrued payroll, accrued commissions
        and all other accruals and the accounts payable on the books of the
        Company through November 30, 2001, listed on the books of the Company,
        but in no event shall such amount exceed $275,000.00;

               (v) The Company will transfer and assign to Seller any cash of
        the Company in excess of $100,000.00 at Closing. In the event that the
        Company does not have $100,000.00 in cash at Closing, Seller will
        contribute any shortfall at Closing to the Company;

               (vi) The Seller will retain and assume all indebtedness of the
        Company to Wells Fargo Bank Texas, National Association and Wells Fargo
        Energy Capital, Inc. and release in writing the Company from any
        liability thereunder, except Buyer will retain the real estate note on
        the Company's Facilities and real estate with Frost Bank; and

               (vii) Seller will except as provided in this Agreement cause all
        indebtedness previously owed to the Company by Seller to be cancelled as
        of the Closing and all indebtedness of Seller to the Company to be
        cancelled as of the Closing.

        (b) Buyer will deliver to Seller:

               (i) a promissory note payable to Seller in the principal amount
        of $930,000.00 in the form of Exhibit "C" (the "Promissory Note")
        secured by the assets, inventory, machinery and equipment of the Company
        as described in that certain Security Agreement in the form of Exhibit
        "D" ("Security Agreement");

               (ii) the Amendments executed by Clayton Lau and Bonita J. Witt,
        respectively;

               (iii) the Company will assign, transfer and convey all accounts
        receivable (which shall total at least $530,000.00) as described on
        Exhibit "A" hereto and that the

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        General Conveyance, Transfer and Assignment in the form of Exhibit "E"
        hereto, ("General Conveyance"),

               (iv) and any cash of the Company over $100,000.00 on the Closing
        Date; and

               (v) allow Seller to use the three (3) existing offices currently
        used by Seller's employees at the Company's Facilities, including phone,
        fax and computer network support until January 31, 2002, and Seller will
        pay to the Company $500.00 per month for the lease of such offices.

Both Seller and Buyer will cooperate and use their Best Efforts to obtain the
written consent of Wells Fargo Bank Texas, National Association, Wells Fargo
energy Capital, Inc. and Frost Bank to the Contemplated Transaction.

                        3. REPRESENTATIONS AND WARRANTIES OF SELLER

        Seller represents and warrants to Buyer as follows:

                        3.1 ORGANIZATION AND GOOD STANDING

               Seller is a corporation duly organized, validly existing, and in
good standing under the laws of the State of Delaware, with full corporate power
and authority to conduct its business as it is now being conducted, to own or
use the properties and assets that it purports to own or use, and to perform all
its obligations under this Agreement. Seller is duly qualified to do business as
a foreign corporation and is in good standing under the laws of Texas.

                        3.2 AUTHORITY; NO CONFLICT

        (b) This Agreement constitutes the legal, valid, and binding obligation
        of Seller, enforceable against Seller in accordance with its terms. Upon
        the execution and delivery by Seller of the endorsed share certificate,
        Agreement, Amendments and release of the Wells Fargo indebtedness
        (collectively, the "Seller's Closing Documents"), the Seller's Closing
        Documents will constitute the legal, valid, and binding obligations of
        Seller, enforceable against Seller in accordance with their respective
        terms. Seller have the absolute and unrestricted right, power,
        authority, and capacity to execute and deliver this Agreement and the
        Seller' Closing Documents and to perform their obligations under this
        Agreement and the Seller's Closing Documents.

        (c) Neither the execution and delivery of this Agreement nor the
        consummation or performance of any of the Contemplated Transactions
        will, directly or indirectly (with or without notice or lapse of time):

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                (i) contravene, conflict with, or result in a violation of any
                provision of the Organizational Documents of the Seller, or any
                resolution adopted by the board of directors or the stockholders
                of the Company;

                (ii) contravene, conflict with, or result in a violation of, or
                give any Governmental Body or other Person the right to
                challenge any of the Contemplated Transactions or to exercise
                any remedy or obtain any relief under, any Legal Requirement or
                any Order to which the Company or either Seller, or any of the
                assets owned or used by the Company, may be subject;

Neither Seller or the Company is or will be required to give any notice to or
obtain any Consent from any Person in connection with the execution and delivery
of this Agreement or the consummation or performance of any of the Contemplated
Transactions except the Wells Fargo Bank Texas, National Association, Wells
Fargo Energy Capital, Inc. and Frost Bank which has been obtained.

                3.3 CAPITALIZATION

        Seller is, and will be on the Closing Date, the record and beneficial
owners and holders of the Shares, free and clear of all Encumbrances. There are
a total of 1,000 shares that have been issued, all of which will be conveyed to
Buyer.

                3.4 FINANCIAL STATEMENTS

        Seller have delivered to Buyer: unaudited consolidated balance sheets of
the Company as at December 31 in each of the years 1998 through 2000, and the
related unaudited consolidated statements of income, changes in stockholders'
equity, and cash flow for each of the fiscal years then ended. Such financial
statements and notes fairly present the financial condition and the results of
operations, changes in stockholders' equity, and cash flow of the Company as at
the respective dates of and for the periods referred to in such financial
statements.

                3.5 BOOKS AND RECORDS

        The books of account, minute books, stock record books, and other
records of the Company, all of which have been made available to Buyer, are
complete and correct and have been maintained in accordance with sound business
practices. At the Closing, all of those books and records will be in the
possession of the Company.

                3.6 TITLE TO PROPERTIES; ENCUMBRANCES

        The Company owns (with good and marketable title in the case of real
property, subject only to the matters permitted by the following sentence) all
the properties and assets (whether real, personal, or mixed and whether tangible
or intangible) that they purport to own located in the Facilities owned or
operated by the Company. All material properties and assets are free and clear
of all Encumbrances except for liens on the real property to Frost Bank. All
assets, equipment and machinery of the Company are being transferred AS IS,
WHERE IS, WITH NO

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WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. Buyer is purchasing
the equipment and machinery of the Company based on their own knowledge and no
warranties of fitness, repair or capability.

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                4. REPRESENTATIONS AND WARRANTIES OF BUYER

        Buyer represents and warrants to Seller as follows:

                4.1 ORGANIZATION AND GOOD STANDING

        Buyer is an individual resident in Houston, Harris County, Texas.

                4.2 AUTHORITY; NO CONFLICT

               (a) This Agreement constitutes the legal, valid, and binding
        obligation of Buyer, enforceable against Buyer and the Company in
        accordance with its terms. Upon the execution and delivery by Buyer and
        the Company of the Agreement, Amendments, General Conveyance and the
        Promissory Note (collectively, the "Buyer's Closing Documents"), the
        Buyer's Closing Documents will constitute the legal, valid, and binding
        obligations of Buyer, enforceable against Buyer in accordance with their
        respective terms. Buyer has the absolute and unrestricted right, power,
        and authority to execute and deliver this Agreement and the Buyer's
        Closing Documents and to perform its obligations under this Agreement
        and the Buyer's Closing Documents.

               (b) Neither the execution and delivery of this Agreement by Buyer
        nor the consummation or performance of any of the Contemplated
        Transactions by Buyer will give any Person the right to prevent, delay,
        or otherwise interfere with any of the Contemplated Transactions.

                4.3 INVESTMENT INTENT

        Buyer is acquiring the Shares for its own account and not with a view to
their distribution within the meaning of Section 2(11) of the Securities Act.

                4.4 CERTAIN PROCEEDINGS

        There is no pending Proceeding that has been commenced against Buyer and
that challenges, or may have the effect of preventing, delaying, making illegal,
or otherwise interfering with, any of the Contemplated Transactions. To Buyer's
Knowledge, no such Proceeding has been Threatened.

                4.5 BROKERS OR FINDERS

        Buyer and its officers and agents have incurred no obligation or
liability, contingent or otherwise, for brokerage or finders' fees or agents'
commissions or other similar payment in connection with this Agreement and will
indemnify and hold Seller harmless from any such

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payment alleged to be due by or through Buyer as a result of the action of Buyer
or its officers or agents.

                5. COVENANTS OF SELLER PRIOR TO CLOSING DATE

                5.1 ACCESS AND INVESTIGATION

        Between the date of this Agreement and the Closing Date, Seller will,
and will cause the Company and its Representatives to afford Buyer and its
Representatives and prospective lenders and their Representatives (collectively,
"Buyer's Advisors") full and free access to the Company's personnel, properties,
contracts, books and records, and other documents and data.

                5.2 BEST EFFORTS

        Between the date of this Agreement and the Closing Date, Seller will use
their Best Efforts to cause the conditions in Section 7 and 8 to be satisfied.

                6. COVENANTS OF BUYER PRIOR TO CLOSING DATE

                6.1 APPROVALS

        Between the date of this Agreement and the Closing Date, Buyer will, and
will cause each Related Person to, cooperate with Seller and the Company with
respect to all filings that Seller is required by Legal Requirements to make in
connection with the Contemplated Transactions, and cooperate with Seller in
obtaining all consents necessary to consummate this Agreement.

                6.2 BEST EFFORTS

        Buyer will use its Best Efforts to cause the conditions in Sections 7
and 8 to be satisfied.

                7. CONDITIONS PRECEDENT TO BUYER'S OBLIGATION TO CLOSE

        Buyer's obligation to purchase the Shares and to take the other actions
required to be taken by Buyer at the Closing is subject to the satisfaction, at
or prior to the Closing, of each of the following conditions (any of which may
be waived by Buyer, in whole or in part):

                7.1 ACCURACY OF REPRESENTATIONS

        All of Seller's representations and warranties in this Agreement, and
each of these representations and warranties, must have been accurate in all
material respects as of the date of this Agreement, and must be accurate in all
material respects as of the Closing Date.

                7.2 SELLER'S PERFORMANCE

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        All of the covenants and obligations that Seller are required to perform
or to comply with pursuant to this Agreement at or prior to the Closing, and
each of these covenants and obligations must have been duly performed and
complied with in all material respects.

        Each document required to be delivered pursuant to Section 2.4 must have
been delivered, and each of the other covenants and obligations in Section 2.4
must have been performed and complied with in all respects.

                7.3 CONSENTS

        Any Consent necessary to consummate the Contemplated Transaction must be
in full force and effect.

                7.4 NO PROCEEDINGS

        Since the date of this Agreement, there must not have been commenced or
Threatened against Buyer, or against any Person affiliated with Buyer, any
Proceeding (a) involving any challenge to, or seeking damages or other relief in
connection with, any of the Contemplated Transactions, or (b) that may have the
effect of preventing, delaying, making illegal, or otherwise interfering with
any of the Contemplated Transactions.

                8. CONDITIONS PRECEDENT TO SELLER'S OBLIGATION TO CLOSE

        Seller's obligation to sell the Shares and to take the other actions
required to be taken by Seller at the Closing is subject to the satisfaction, at
or prior to the Closing, of each of the following conditions (any of which may
be waived by Seller, in whole or in part):

                8.1 ACCURACY OF REPRESENTATIONS

        All of Buyer's representations and warranties in this Agreement, and
each of these representations and warranties, must have been accurate in all
material respects as of the date of this Agreement and must be accurate in all
material respects as of the Closing Date as if made on the Closing Date.

                8.2 BUYER'S PERFORMANCE

        All of the covenants and obligations that Buyer is required to perform
or to comply with pursuant to this Agreement at or prior to the Closing
(considered collectively), and each of these covenants and obligations
(considered individually), must have been performed and complied with in all
material respects.

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        Buyer must have delivered each of the documents required to be delivered
by Buyer pursuant to Section 2.4 and must have performed all actions required to
be made by Buyer pursuant to Sections 2.4(b).

                8.3 CONSENTS

        Any Consents necessary to consummate the Contemplated Transaction must
be in full force and effect.

                8.4 NO INJUNCTION

        There must not be in effect any Legal Requirement or any injunction or
other Order that (a) prohibits the sale of the Shares by Seller to Buyer, and
(b) has been adopted or issued, or has otherwise become effective, since the
date of this Agreement.

                9. TERMINATION

                9.1 TERMINATION EVENTS

        This Agreement may, by notice given prior to or at the Closing, be
terminated:

               (a) by either Buyer or Seller if a material Breach of any
        provision of this Agreement has been committed by the other party and
        such Breach has not been waived;

               (b) (i) by Buyer if any of the conditions in Section 7 has not
        been satisfied as of the Closing Date or if satisfaction of such a
        condition is or becomes impossible (other than through the failure of
        Buyer to comply with its obligations under this Agreement) and Buyer has
        not waived such condition on or before the Closing Date; or (ii) by
        Seller, if any of the conditions in Section 8 has not been satisfied of
        the Closing Date or if satisfaction of such a condition is or becomes
        impossible (other than through the failure of Seller to comply with
        their obligations under this Agreement) and Seller have not waived such
        condition on or before the Closing Date;

               (c) by mutual consent of Buyer and Seller; or

               (d) by either Buyer or Seller if the Closing has not occurred
        (other than through the failure of any party seeking to terminate this
        Agreement to comply fully with its obligations under this Agreement) on
        or before December 31, 2001, or such later date as the parties may agree
        upon.

                9.2 EFFECT OF TERMINATION

        Each party's right of termination under Section 9.1 is in addition to
any other rights it may have under this Agreement or otherwise, and the exercise
of a right of termination will not be an election of remedies. If this Agreement
is terminated pursuant to Section 9.1, all further obligations of the parties
under this Agreement will terminate, except that the obligations in Sections
11.1 and 11.3 will survive; provided, however, that if this Agreement is
terminated by a

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party because of the Breach of the Agreement by the other party or because one
or more of the conditions to the terminating party's obligations under this
Agreement is not satisfied as a result of the other party's failure to comply
with its obligations under this Agreement, the terminating party's right to
pursue all legal remedies will survive such termination unimpaired.

                10. INDEMNIFICATION; REMEDIES

                10.1 SURVIVAL; RIGHT TO INDEMNIFICATION NOT AFFECTED BY
                KNOWLEDGE

        All representations, warranties, covenants, and obligations in this
Agreement, and any other certificate or document delivered pursuant to this
Agreement will survive the Closing for a period of six (6) months.

                10.2 INDEMNIFICATION AND PAYMENT OF DAMAGES BY SELLER

        Seller, jointly and severally, will indemnify and hold harmless Buyer
and his respective Representatives (collectively, the "Indemnified Persons")
for, and will pay to the Indemnified Persons the amount of, any loss, liability,
claim, damage (including incidental and consequential damages), expense
(including costs of investigation and defense and reasonable attorneys' fees) or
diminution of value, whether or not involving a third-party claim (collectively,
"Damages"), arising, directly or indirectly, from or in connection with any
Breach of any representation or warranty made by Seller in this Agreement, or
any other certificate or document delivered by Seller pursuant to this
Agreement.

                10.3 INDEMNIFICATION AND PAYMENT OF DAMAGES BY BUYER

        Buyer will indemnify and hold harmless Seller, and will pay to Seller
the amount of any Damages arising, directly or indirectly, from or in connection
with (a) any Breach of any representation or warranty made by Buyer in this
Agreement or in any certificate delivered by Buyer pursuant to this Agreement,
(b) any Breach by Buyer of any covenant or obligation of Buyer in this
Agreement, or (c) any claim by any Person for brokerage or finder's fees or
commissions or similar payments based upon any agreement or understanding
alleged to have been made by such Person with Buyer (or any Person acting on its
behalf) in connection with any of the Contemplated Transactions.

                10.4 TIME LIMITATIONS

        If the Closing occurs, Seller will have no liability (for
indemnification or otherwise) with respect to any representation or warranty, or
covenant or obligation to be performed and complied with prior to the Closing
Date, unless on or before May 1, 2002, Buyer notifies Seller of a claim
specifying the factual basis of that claim in reasonable detail to the extent
then known by Buyer. If the Closing occurs, Buyer will have no liability (for
indemnification or otherwise) with respect to any representation or warranty, or
covenant or obligation to be performed and complied with prior to the Closing
Date, unless on or before May 1, 2002, Seller notifies Buyer

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of a claim specifying the factual basis of that claim in reasonable detail to
the extent then known by Seller.

                10.5 LIMITATIONS ON AMOUNT

        Seller will have no liability (for indemnification or otherwise) with
respect to the matters described in Section 10.2 until the total of all Damages
with respect to such matters exceeds $50,000.00, and then only for $100,000.00
and no more. Buyer will have no liability (for indemnification or otherwise)
with respect to the matters described in Section 10.3 until the total of all
Damages with respect to such matters exceeds $50,000.00, and then only for
$100,000.00 and no more.

                10.6 PROCEDURE FOR INDEMNIFICATION--THIRD PARTY CLAIMS

               (a) Promptly after receipt by an indemnified party under Section
        10.2 or Section 10.3 of notice of the commencement of any Proceeding
        against it, such indemnified party will, if a claim is to be made
        against an indemnifying party under such Section, give notice to the
        indemnifying party of the commencement of such claim, but the failure to
        notify the indemnifying party will not relieve the indemnifying party of
        any liability that it may have to any indemnified party, except to the
        extent that the indemnifying party demonstrates that the defense of such
        action is prejudiced by the indemnifying party's failure to give such
        notice.

               (b) If any Proceeding referred to in Section 10.6(a) is brought
        against an indemnified party and it gives notice to the indemnifying
        party of the commencement of such Proceeding, the indemnifying party
        will, unless the claim involves Taxes, be entitled to participate in
        such Proceeding and, to the extent that it wishes (unless (i) the
        indemnifying party is also a party to such Proceeding and the
        indemnified party determines in good faith that joint representation
        would be inappropriate, or (ii) the indemnifying party fails to provide
        reasonable assurance to the indemnified party of its financial capacity
        to defend such Proceeding and provide indemnification with respect to
        such Proceeding), to assume the defense of such Proceeding with counsel
        satisfactory to the indemnified party and, after notice from the
        indemnifying party to the indemnified party of its election to assume
        the defense of such Proceeding, the indemnifying party will not, as long
        as it diligently conducts such defense, be liable to the indemnified
        party under this Section 10 for any fees of other counsel or any other
        expenses with respect to the defense of such Proceeding, in each case
        subsequently incurred by the indemnified party in connection with the
        defense of such Proceeding, other than reasonable costs of
        investigation. If the indemnifying party assumes the defense of a
        Proceeding, (i) it will be conclusively established for purposes of this
        Agreement that the claims made in that Proceeding are within the scope
        of and subject to indemnification; (ii) no compromise or settlement of
        such claims may be effected by the indemnifying party without the
        indemnified party's consent unless (A) there is no finding or admission
        of any violation of Legal Requirements or any violation of the rights of
        any Person and no effect on any other claims that may be made against
        the indemnified party, and (B) the sole relief provided is monetary
        damages that are paid in full by the indemnifying party; and (iii) the

<PAGE>

        indemnified party will have no liability with respect to any compromise
        or settlement of such claims effected without its consent. If notice is
        given to an indemnifying party of the commencement of any Proceeding and
        the indemnifying party does not, within ten days after the indemnified
        party's notice is given, give notice to the indemnified party of its
        election to assume the defense of such Proceeding, the indemnifying
        party will be bound by any determination made in such Proceeding or any
        compromise or settlement effected by the indemnified party.

               (c) Notwithstanding the foregoing, if an indemnified party
        determines in good faith that there is a reasonable probability that a
        Proceeding may adversely affect it or its affiliates other than as a
        result of monetary damages for which it would be entitled to
        indemnification under this Agreement, the indemnified party may, by
        notice to the indemnifying party, assume the exclusive right to defend,
        compromise, or settle such Proceeding, but the indemnifying party will
        not be bound by any determination of a Proceeding so defended or any
        compromise or settlement effected without its consent (which may not be
        unreasonably withheld).

               (d) Seller hereby consent to the non-exclusive jurisdiction of
        any court in which a Proceeding is brought against any Indemnified
        Person for purposes of any claim that an Indemnified Person may have
        under this Agreement with respect to such Proceeding or the matters
        alleged therein, and agree that process may be served on Seller with
        respect to such a claim anywhere in the world.

        10.7 PROCEDURE FOR INDEMNIFICATION--OTHER CLAIMS

        A claim for indemnification for any matter not involving a third-party
claim may be asserted by notice to the party from whom indemnification is
sought.

                11. GENERAL PROVISIONS

                11.1 EXPENSES

        Except as otherwise expressly provided in this Agreement, each party to
this Agreement will bear its respective expenses incurred in connection with the
preparation, execution, and performance of this Agreement and the Contemplated
Transactions, including all fees and expenses of agents, representatives,
counsel, and accountants. Seller will pay reasonable attorneys fees to counsel
for Buyer.

                11.2 PUBLIC ANNOUNCEMENTS

        Any public announcement or similar publicity with respect to this
Agreement or the Contemplated Transactions will be issued, if at all, at such
time and in such manner as Seller determines. Unless consented to by Seller in
advance or required by Legal Requirements, prior to the Closing Buyer shall, and
shall cause the Company to, keep this Agreement strictly confidential and may
not make any disclosure of this Agreement to any Person. Seller and Buyer will
consult with each other concerning the means by which the Company's employees,
customers, and suppliers and others having dealings with the Company will be
informed of the

<PAGE>

Contemplated Transactions, and Seller will have the right to be present for any
such communication.

                11.3 CONFIDENTIALITY

        Between the date of this Agreement and the Closing Date, Buyer and
Seller will maintain in confidence, and will cause the directors, officers,
employees, agents, and advisors of Buyer and the Company to maintain in
confidence any written, oral, or other information obtained in confidence from
another party or the Company in connection with this Agreement or the
Contemplated Transactions, unless (a) such information is already known to such
party or to others not bound by a duty of confidentiality or such information
becomes publicly available through no fault of such party, (b) the use of such
information is necessary or appropriate in making any filing or obtaining any
consent or approval required for the consummation of the Contemplated
Transactions, or (c) the furnishing or use of such information is required by
legal proceedings.

                11.4 NOTICES

        All notices, consents, waivers, and other communications under this
Agreement must be in writing and will be deemed to have been duly given when (a)
delivered by hand (with written confirmation of receipt), (b) sent by telecopier
(with written confirmation of receipt), provided that a copy is mailed by
registered mail, return receipt requested, or (c) when received by the
addressee, if sent by a nationally recognized overnight delivery service
(receipt requested), in each case to the appropriate addresses and telecopier
numbers set forth below (or to such other addresses and telecopier numbers as a
party may designate by notice to the other parties):

                             SELLER: Mountain Compressed Air, Inc.
                             2466 Commerce Blvd.
                             Grand Junction, Colorado 81505
                             Attn: Munawar H.  Hidayatallah
                             Facsimile No: (970) 243-3260

                             with a copy to: Wilson, Cribbs, Goren & Flaum, P.C.
                             440 Louisiana, Suite 2200
                             Houston, TX 77002
                             Attn: Theodore F.  Pound III
                             Facsimile No: (713) 229-8824

<PAGE>

                             BUYER: Clayton Lau
                             8150 Lawndale
                             Houston, Texas 77012
                             Facsimile No: (713) 928-6200

                             With a copy to: Randall B. Strong
                             1515 North Alexander Drive, Suite 306
                             Baytown, Texas 77520
                             Telephone No: (281) 428-2200
                             Facsimile No: (281) 427-0864

                11.5 JURISDICTION; SERVICE OF PROCESS

        Any action or proceeding seeking to enforce any provision of, or based
on any right arising out of, this Agreement may be brought against any of the
parties in the courts of the State of Texas, County of Harris, or, if it has or
can acquire jurisdiction, in the United States District Court for the Southern
District of Texas, and each of the parties consents to the jurisdiction of such
courts (and of the appropriate appellate courts) in any such action or
proceeding and waives any objection to venue laid therein. Process in any action
or proceeding referred to in the preceding sentence may be served on any party
anywhere in the world.

                11.6 FURTHER ASSURANCES

        The parties agree (a) to furnish upon request to each other such further
information, (b) to execute and deliver to each other such other documents, and
(c) to do such other acts and things, all as the other party may reasonably
request for the purpose of carrying out the intent of this Agreement and the
documents referred to in this Agreement.

                11.7 WAIVER

        The rights and remedies of the parties to this Agreement are cumulative
and not alternative. Neither the failure nor any delay by any party in
exercising any right, power, or privilege under this Agreement or the documents
referred to in this Agreement will operate as a waiver of such right, power, or
privilege, and no single or partial exercise of any such right, power, or
privilege will preclude any other or further exercise of such right, power, or
privilege or the exercise of any other right, power, or privilege. To the
maximum extent permitted by applicable law, (a) no claim or right arising out of
this Agreement or the documents referred to in this Agreement can be discharged
by one party, in whole or in part, by a waiver or renunciation of the claim or
right unless in writing signed by the other party; (b) no waiver that may be
given by a party will be applicable except in the specific instance for which it
is given; and (c) no notice to or demand on one party will be deemed to be a
waiver of any obligation of such party or of the right of the party giving such
notice or demand to take further action without notice or demand as provided in
this Agreement or the documents referred to in this Agreement.

<PAGE>

                11.8 ENTIRE AGREEMENT AND MODIFICATION

        This Agreement supersedes all prior agreements between the parties with
respect to its subject matter and constitutes (along with the documents referred
to in this Agreement) a complete and exclusive statement of the terms of the
agreement between the parties with respect to its subject matter. This Agreement
may not be amended except by a written agreement executed by the party to be
charged with the amendment.

                11.9 ASSIGNMENTS, SUCCESSORS, AND NO THIRD-PARTY RIGHTS

        Neither party may assign any of its rights under this Agreement without
the prior consent of the other parties. Subject to the preceding sentence, this
Agreement will apply to, be binding in all respects upon, and inure to the
benefit of the successors and permitted assigns of the parties. Nothing
expressed or referred to in this Agreement will be construed to give any Person
other than the parties to this Agreement any legal or equitable right, remedy,
or claim under or with respect to this Agreement or any provision of this
Agreement. This Agreement and all of its provisions and conditions are for the
sole and exclusive benefit of the parties to this Agreement and their successors
and assigns.

                11.10 SEVERABILITY

        If any provision of this Agreement is held invalid or unenforceable by
any court of competent jurisdiction, the other provisions of this Agreement will
remain in full force and effect. Any provision of this Agreement held invalid or
unenforceable only in part or degree will remain in full force and effect to the
extent not held invalid or unenforceable.

                11.11 SECTION HEADINGS, CONSTRUCTION

        The headings of Sections in this Agreement are provided for convenience
only and will not affect its construction or interpretation. All references to
"Section" or "Sections" refer to the corresponding Section or Sections of this
Agreement. All words used in this Agreement will be construed to be of such
gender or number as the circumstances require. Unless otherwise expressly
provided, the word "including" does not limit the preceding words or terms.

                11.12 TIME OF ESSENCE

        With regard to all dates and time periods set forth or referred to in
this Agreement, time is of the essence.

<PAGE>

                11.13 GOVERNING LAW

        This Agreement will be governed by the laws of the State of Texas
without regard to conflicts of laws principles.

                11.14 COUNTERPARTS

        This Agreement may be executed in one or more counterparts, each of
which will be deemed to be an original copy of this Agreement and all of which,
when taken together, will be deemed to constitute one and the same agreement.

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

                                       SELLER:

                                       MOUNTAIN COMPRESSED AIR, INC.

                                       ----------------------------------------
                                       Munawar H. Hidayatallah,
                                       Chief Executive Officer

                                       BUYER:

                                       ----------------------------------------<PAGE>

                                  EXHIBIT 10.2
                                 PROMISSORY NOTE

$930,000.00                                                    November 30, 2001

        FOR VALUE RECEIVED, Clayton Lau, an individual residing in Harris
County, Texas and Houston Dynamic Service, Inc., a Texas corporation, jointly
and severally ("Maker"), promise to pay to the order of Mountain Compressed Air,
Inc, a Texas corporation ("Payee"), in lawful money of the United States of
America, the principal sum of Nine Hundred Thirty Thousand Dollars
($930,000.00), together with interest in arrears on the unpaid principal balance
at an annual rate equal to 7%, in the manner provided below. Interest shall be
calculated on the basis of a year of 365 or 366 days, as applicable, and charged
for the actual number of days elapsed.

        This Note has been executed and delivered pursuant to and in accordance
with the terms and conditions of the Stock Purchase Agreement, effective as of
November 30, 2001, by and between Clayton Lau and Payee (the "Agreement"), and
is subject to the terms and conditions of the Agreement, which are, by this
reference, incorporated herein and made a part hereof. Capitalized terms used in
this Note without definition shall have the respective meanings set forth in the
Agreement.

        1. PAYMENTS

               1.1 PRINCIPAL AND INTEREST

        The principal amount of this Note shall be due and payable in one
installment on November 30, 2007. Interest on the unpaid principal balance of
this Note shall be due and payable monthly beginning on December 30, 2001 and
the same day of each succeeding month until paid in full.

               1.2 MANNER OF PAYMENT

        All payments of principal and interest on this Note shall be made by
bank check at 2466 Commerce Blvd., Grand Junction, Colorado 81505, or at such
other place in the United States of America as Payee shall designate to Maker in
writing or by wire transfer of immediately available funds to an account
designated by Payee in writing. If any payment of principal or interest on this
Note is due on a day which is not a Business Day, such payment shall be due on
the next succeeding Business Day, and such extension of time shall be taken into
account in calculating the amount of interest payable under this Note. "Business
Day" means any day other than a Saturday, Sunday or legal holiday in the State
of Texas.

<PAGE>

               1.3 PREPAYMENT

        Maker may, without premium or penalty, at any time and from time to
time, prepay all or any portion of the outstanding principal balance due under
this Note, provided that each such prepayment is accompanied by accrued interest
on the amount of principal prepaid calculated to the date of such prepayment.
Any partial prepayments shall be applied to installments of principal in inverse
order of their maturity. In the event that Maker prepays the principal of the
Note in an aggregate amount in excess of $400,000.00, the Payee agrees to reduce
the remaining principal by fifteen percent (15%).

<PAGE>

        2. DEFAULTS

               2.1 EVENTS OF DEFAULT

        The occurrence of any one or more of the following events with respect
to Maker shall constitute an event of default hereunder ("Event of Default"):

               (a) If Maker shall fail to pay when due any payment of principal
or interest on this Note and such failure continues for ten (10) days after
Payee notifies Maker therein writing.

               (b) If, pursuant to or within the meaning of the United States
Bankruptcy Code or any other federal or state law relating to insolvency or
relief of debtors (a "Bankruptcy Law"), Maker shall (i) commence a voluntary
case or proceeding; (ii) consent to the entry of an order for relief against it
in an involuntary case; (iii) consent to the appointment of a trustee, receiver,
assignee, liquidator or similar official; (iv) make an assignment for the
benefit of its creditors; or (v) admit in writing its inability to pay its debts
as they become due.

               (c) If a court of competent jurisdiction enters an order or
decree under any Bankruptcy Law that (i) is for relief against Maker in an
involuntary case, (ii) appoints a trustee, receiver, assignee, liquidator or
similar official for Maker or substantially all of Maker's properties, or (iii)
orders the liquidation of Maker, and in each case the order or decree is not
dismissed within 120 days.

               (d) Make any additional investment in fixed assets in any one
fiscal year in excess of an aggregate of $50,000.00 without prior written
approval of Payee.

               (e) Create, incur, assume or permit to exist any indebtedness or
liabilities resulting from borrowings, loans or advances, whether secured or
unsecured, matured or unmatured, liquidated or unliquidated, joint or several,
except the liability of Maker to Payee in excess of $50,000.00, without prior
written approval of Payee.

               (f) Merge into or consolidate with any other entity; make any
substantial change in the nature of Maker's business as conducted as of the date
hereof; acquire all or substantially all of the assets of any other entity; nor
sell, lease, transfer, or otherwise dispose of all or a substantial or material
portion of Maker's assets except in the ordinary course of its business.

               (g) Guaranty or become liable in any way as surety, endorser,
accommodation endorser or otherwise for, nor pledge or hypothecate any assets of
Maker as security for, any liabilities or obligations of any other person or
entity, except any of the foregoing in favor of Payee.

<PAGE>

               (h) Declare or pay any dividend or distribution either in cash,
stock or any other property on Maker's stock now or hereafter outstanding, nor
redeem, retire, repurchase or otherwise acquire any shares of any class of
Maker's stock now or hereafter outstanding.

               (i) Mortgage, pledge, grant or permit to exist a security
interest in, or lien upon, all or any portion of Maker's assets now owned or
hereafter acquired, except any of the foregoing in favor of Payee unless such
interest is created as a secondary lien to Payee's security interest.

               (j) Increase or pay compensation to officers or stockholders of
the Company in an amount greater than paid the previous year, except in the case
of Clayton Lau total compensation including salary and bonus (but excluding
principal and interest on this Note) paid for any year may not exceed
$175,000.00 until this Note is paid in full.

                      2.2 NOTICE BY MAKER

        Maker shall notify Payee in writing within five days after the
occurrence of any Event of Default of which Maker acquires knowledge.

                      2.3 REMEDIES

        Upon the occurrence of an Event of Default hereunder (unless all Events
of Default have been cured or waived by Payee), Payee may, at its option, (i) by
written notice to Maker, declare the entire unpaid principal balance of this
Note, together with all accrued interest thereon, immediately due and payable
regardless of any prior forbearance, (ii) exercise any and all rights and
remedies available to it under applicable law, including, without limitation,
the right to collect from Maker all sums due under this Note and (iii) notify
Maker of default and elect to obtain a sixty percent (60%) equity interest on a
fully diluted basis in Maker. Payee's election to obtain a sixty percent (60%)
interest in Maker shall satisfy in full the Maker's obligations under the Note
and Security Agreement. Maker shall pay all reasonable costs and expenses
incurred by or on behalf of Payee in connection with Payee's exercise of any or
all of its rights and remedies under this Note, including, without limitation,
reasonable attorneys' fees.

                      3. MISCELLANEOUS

                      3.1 WAIVER

        The rights and remedies of Payee under this Note shall be cumulative and
not alternative. No waiver by Payee of any right or remedy under this Note shall
be effective unless in a writing signed by Payee. Neither the failure nor any
delay in exercising any right, power or privilege under this Note will operate
as a waiver of such right, power or privilege and no single or partial exercise
of any such right, power or privilege by Payee will preclude any other or
further exercise of such right, power or privilege or the exercise of any other
right, power or privilege. To the maximum extent permitted by

<PAGE>

applicable law, (a) no claim or right of Payee arising out of this Note can be
discharged by Payee, in whole or in part, by a waiver or renunciation of the
claim or right unless in a writing, signed by Payee; (b) no waiver that may be
given by Payee will be applicable except in the specific instance for which it
is given; and (c) no notice to or demand on Maker will be deemed to be a waiver
of any obligation of Maker or of the right of Payee to take further action
without notice or demand as provided in this Note. Maker hereby waives
presentment, demand, protest and notice of dishonor and protest.

                      3.2 NOTICES

        Any notice required or permitted to be given hereunder shall be given in
accordance with Section 11.4 of the Agreement.

                      3.3 SEVERABILITY

        If any provision in this Note is held invalid or unenforceable by any
court of competent jurisdiction, the other provisions of this Note will remain
in full force and effect. Any provision of this Note held invalid or
unenforceable only in part or degree will remain in full force and effect to the
extent not held invalid or unenforceable.

                      3.4 GOVERNING LAW

        This Note will be governed by the laws of the State of Texas without
regard to conflicts of laws principles.

                      3.5 PARTIES IN INTEREST

        This Note shall bind Maker and its successors and assigns.

                      3.6 SECTION HEADINGS, CONSTRUCTION

        The headings of Sections in this Note are provided for convenience only
and will not affect its construction or interpretation. All references to
"Section" or "Sections" refer to the corresponding Section or Sections of this
Note unless otherwise specified.

                      3.7 SECURITY AGREEMENT

        This Note is secured by that certain Security Agreement between Maker
and Payee of even date herewith.

        All words used in this Note will be construed to be of such gender or
number as the circumstances require. Unless otherwise expressly provided, the
words "hereof" and "hereunder" and similar references refer to this Note in its
entirety and not to any specific section or subsection hereof.

<PAGE>

        IN WITNESS WHEREOF, Maker has executed and delivered this Note as of the
date first stated above.

                                         MAKER:

                                         ____________________________________
                                         Clayton Lau

                                         HOUSTON DYNAMIC SERVICE, INC.

                                         By:_________________________________
                                            Clayton Lau, President

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