Exhibit 10.4

                      POWER PLANT AGGREGATES OF IOWA, INC.

                            STOCK PURCHASE AGREEMENT

      Colin C. Jensen, Colin C. Jensen, Jr., Irving F. Jensen, Jr., Irving F.
Jensen, III, Richard A. Everist, Richard Everist, Jr., Tom Everist, Erik M.
Jensen, Mark R. Jensen, and T. S. "Steve" Everist (herein collectively called
"Sellers") and JTM Industries, Inc. (hereinafter called "Buyer") hereby agree as
follows:

      1.    SELLERS: Sellers represent and warrant that Sellers own or will on
            the Closing Date own all of the issued stock (hereinafter "Shares")
            in Power Plant Aggregate of Iowa, Inc., an Iowa corporation
            (hereinafter called "Company"). As used herein, "Company" includes
            Midwest Fly Ash & Materials, Inc. (hereinafter called "MWFA"), a
            wholly owned subsidiary of Company and the only subsidiary of the
            Company.

      2.    SALE: Subject to the conditions and upon the terms and provisions
            set forth in this Stock Purchase Agreement, Buyer agrees to purchase
            from Sellers, and Sellers agree to sell to Buyer, the Shares, free
            and clear of any and all claims, liens, security interests, rights
            or encumbrances. The consideration to be paid in connection with the
            acquisition shall be $6,000,000 (Six Million Dollars) $100,000 of
            which has been received as a good faith deposit, for the stock of
            Company, plus or minus additional cash (not to exceed $500,000) in
            an amount equal to the working capital of the Company on the Closing
            Date. Exhibit A will set forth the calculations of the purchase
            price. The working capital shall be defined as the amount of current
            assets less current liabilities (including liabilities for taxes
            through the Closing). The purchase price will be paid by wire to the
            Sellers to an account designated by Sellers. At Closing, the Company
            will have no debts or liabilities that have not been assumed by
            Sellers (including interest payable) or any intercompany accounts,
            affiliate accounts, or any obligations for taxes. In order to
            provide collateral for open tax years, Buyer is hereby granted the
            right to offset any monies owed to Sellers under the consultation
            agreement attached hereto as Exhibit D against any taxes determined
            by the IRS to be delinquent and unpaid and which are not under
            protest, appeal, or review by Sellers. If Sellers are in compliance
            with the terms of this Agreement and Closing does not occur, the
            $100,000 deposit referenced above will be forfeited by Buyer and
            retained by Sellers.

      3.    CLOSING DATE: The closing (herein called the "Closing") of the
            principal transaction herein provided for shall take place at 10:00
            a.m. on March 20, 1998, at the offices of Heidman, Redmond,
            Fredregill, Patterson, Plaza & Dykstra, L.L.P., or at such other
            time and place as may be agreed upon by Buyer and Sellers in
            writing.


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            The date and time at which the Closing is to occur is herein
            sometimes referred to as the "Closing Date".

      4.    TRANSACTION AT CLOSING: At the Closing, the following transactions
            shall be effected:

            a.    Shares: Sellers shall deliver to Buyer certificates
                  representing all the Shares, in marketable form and without
                  restrictions. Each of the stock certificates representing the
                  Shares shall be duly endorsed to Buyer, or accompanied by a
                  duly executed stock power in form sufficient to permit
                  transfer of the Shares to Buyer.

            b.    Payment: The remaining purchase price, as shown on Exhibit A,
                  shall be paid by wire at the Closing.

            c.    Dividends: All dividends now due or to become due on the
                  Shares shall belong to and be collectable by Buyer.

            d.    Corporate Status: Sellers shall deliver to Buyer a certificate
                  of good standing as to Company from the State of Iowa, and
                  certificates from duly constituted authorities of each other
                  state in which the Company (including subsidiaries) does
                  business, stating that the Company (or the subsidiary) is duly
                  qualified and admitted in good standing in each such state.

            e.    Assets Removed from Company: Only the cash in the accounts of
                  Company and MWFA, and the assets relevant to the continued
                  business and operation of MWFA shall remain in the Company and
                  MWFA at the time of the transfer. The net of current assets
                  less current liabilities will be treated as cash. Equipment
                  related to the rock crushing operations(RAP), accounts
                  receivable from RAP, life insurance policies and their cash
                  values, leasehold improvements, building and related land,
                  memberships, and miscellaneous equipment and other items shall
                  be transferred from Company and MWFA to the Sellers' designee
                  prior to the Closing, based upon a disclosure list to be shown
                  as Exhibit B. Any tax payable as a result of such transfers,
                  pursuant to IRC ss. 336(a) or any other applicable provision,
                  shall be calculated and treated as a current liability of the
                  Company that has the effect of reducing its working capital.

            f.    Short Term Lease: Sellers will deliver a short term lease of
                  Company's existing corporate offices in Sioux City, Iowa to
                  Buyer for a term no longer than thirty (30) days after closing
                  with no rent to be paid.


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            g.    Resignations of Officers and Directors: Resignations of all
                  current officers and directors of Company and MWFA, effective
                  as of the Closing Date.

            h.    Opinion of Counsel: Buyer shall have received the opinion of
                  Heidman, Redmond, Fredregill, Patterson, Plaza & Dykstra,
                  L.L.P., counsel to the Company in connection with this
                  Agreement, dated the Closing Date, substantially in the form
                  attached as Exhibit C.

            i.    Consultation Agreement: Sellers shall deliver to Buyer a
                  Consultation and Royalty Agreement substantially in the form
                  of Exhibit D executed by Sellers.

            j.    Officers Certificate: Buyer shall deliver to Sellers a
                  certificate, dated the Closing Date and executed by the
                  president or vice-president of Buyer substantially in the form
                  of Exhibit E.

            k.    Opinion of Counsel: The Sellers shall receive the opinion of
                  Parsons Behle & Latimer, counsel of the Buyer in connection
                  with this Agreement, dated the Closing Date, substantially in
                  the form of Exhibit F.

            l.    Officers Certificates: Sellers shall have delivered to Buyer a
                  certificate dated the Closing Date and executed by the
                  president of a vice president of Company substantially in the
                  form of Exhibit G, and a certificate from the chief financial
                  officer of Company substantially in the form of Exhibit H.

            m.    Good Standing Certificates: Buyer shall have delivered to
                  Sellers (i) a copy of Buyer's certificate of incorporation,
                  including all amendments thereto, certified by the Secretary
                  of State of the State of Texas, and (b) a certificate from the
                  Texas Secretary of State to the effect that Buyer is in good
                  standing or subsisting in such jurisdiction, listing all
                  charter documents of Buyer on file.

            n.    Employees: Buyer shall have reached agreements with key
                  Company employees on terms reasonably satisfactory to Buyer.

      5.    REPRESENTATIONS, WARRANTIES AND COVENANTS OF SELLERS: Sellers
            represent, warrant, and covenant, jointly and severally, to Buyer,
            as of the date of this Stock Purchase Agreement that all of the
            following are true, accurate, and complete statements in all
            respects:


                                       3


            a.    Corporate Standing: Company is a corporation duly organized,
                  validly existing and in good standing under the laws of the
                  State of Iowa with full power and authority:

                  i)    To own and operate its assets, properties and business;

                  ii)   To conduct its business as the same is now being
                        conducted; and

                  iii)  To conduct its business in each jurisdiction where the
                        nature of its business or ownership of properties
                        requires such qualification, excepting only instances in
                        which a failure to qualify is not material.

            b.    Capitalization: The Company has only authorized a single class
                  of common stock (and no other stock or securities), of which
                  230 Shares are issued and outstanding, all of which are owned
                  by Sellers. MWFA has authorized a single class of common stock
                  which 50 shares are issued and outstanding and are owned by
                  Company. There are no outstanding options, warrants, calls,
                  subscriptions, commitments, agreements or other rights to
                  purchase or dispose of Company or MWFA common stock or other
                  securities which are, or may at any time be, convertible into
                  stock or other securities in Company or MWFA.

            c.    Title to Shares: Sellers on the Closing Date will:

                  i)    Be the record owner of the Shares, and

                  ii)   Have good and marketable title to all Shares, free and
                        clear of any and all claims, rights, encumbrances,
                        restrictions, rights of first refusal or options, and

                  iii)  Have the full right, power and authority to sell, assign
                        and transfer the Shares so that as a result of the
                        Closing, Buyer shall be the absolute owner of the
                        Shares, free and clear of all liens, claims, security
                        interests, redemption rights, charges, options,
                        restrictions and any other encumbrances.

            d.    No Violation, Breach, Etc.: The performance of this Stock
                  Purchase Agreement will not:

                  i)    Violate any provision of the Company's or MWFA's
                        Articles of Incorporation or Bylaws, or


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                  ii)   Result in a breach or constitute a default under (or an
                        event which with notice or lapse of time would become a
                        default) any agreement, indenture, mortgage, lease, or
                        other obligation or instrument to which the Company, or
                        the Sellers are subject or a party. By execution hereof
                        the Sellers waive the terms of their existing
                        Stockholder Agreement, or

                  iii)  Require the consent, approval or action of, or filing
                        with or notice to, any governmental or regulatory
                        authority.

            e.    Legal, Binding and Valid Obligation: This Stock Purchase
                  Agreement has been duly executed and delivered by Sellers and
                  constitutes the legal, binding and valid obligation of
                  Sellers, enforceable in accordance with its terms (subject, as
                  to the enforcement of remedies, to applicable bankruptcy,
                  reorganization, insolvency, moratorium, or other laws
                  affecting the enforcement of creditor's rights generally and
                  to possible limitations on the availability of equitable
                  remedies including specific performance).

            f.    Compliance with Laws, Etc.: Company is in compliance with all
                  material and applicable laws, regulations, ordinances, and
                  rules of each local, state and federal government or
                  administrative body having jurisdiction over the Company and
                  its business.

            g.    Litigation, Claims, Etc.: Except as set forth on Exhibit I,
                  there are no proceedings, actions, litigations, judgments or
                  claims of any nature whatsoever against the Company pending
                  before any government or any administrative forum or before
                  any court or, to the best of Sellers' knowledge, threatened
                  against the Company and Sellers do not know of any basis for
                  any such proceedings, actions, litigations, judgments or
                  claims involving or affecting the Company or its business.

            h.    Officers and Directors: The officers and directors of Company
                  and of MWFA are the persons listed on Exhibit J.

            i.    Financial Condition: Sellers have provided to Buyer audited
                  consolidated financial statements for Company and MWFA for the
                  fiscal years ending March 31, 1997, 1996 and 1995 and
                  unaudited financial statements for the nine months ending
                  December 31, 1997. Sellers further represent that the combined
                  operating revenue for all operations (including RAP) for the
                  fiscal period 1997 exceeded $6,900,000 (6.9 Million Dollars).
                  A restated EBIT for a fiscal year 1997, when certain expenses
                  not likely to be incurred by Buyer and profits (or losses) of
                  RAP operations are removed,


                                       5


                  would be in excess of $1,000,000 (1 Million Dollars). These
                  financials (herein "Financial Statements"):

                  i)    Fairly present the Company's financial condition and
                        operations as of and through the respective dates and
                        periods therein delineated, and the results of Company's
                        operations and changes in financial position for the
                        periods then ended, and

                  ii)   Have been prepared in accordance with generally accepted
                        accounting principles applied on a consistent basis.

                  As of the Closing Date, no material adverse change in the
                  financial condition or operations of the Company will have
                  occurred from that shown on the December 31, 1997 financial
                  statements. The parties acknowledge that the Mid-America
                  contract with Company expires May 1, 1998.

            j.    Liabilities: Except as set forth in Exhibit K, or except to
                  the extent reflected or reserved against in the Financial
                  Statements, the Company has incurred no debts, liabilities or
                  obligations of any nature, whether accrued, absolute, known or
                  unknown, contingent or otherwise, and whether due or to become
                  due, including, but not limited to, liabilities or obligations
                  on account of taxes or other governmental charges, or
                  penalties, interest or fines thereon or in respect thereof,
                  except those in the aggregate, are not material to the
                  Company. Buyer and Sellers acknowledge that debts, liabilities
                  or obligations unknown by Sellers on the Closing Date which
                  total less than $30,000 in the aggregate are deemed
                  non-material.

            k.    Absence of Changes: Except as described on Exhibit L, between
                  January 1, 1998, and the Closing Date, Company has not:

                  i)    Declared or paid any dividend or made any other
                        distribution on, or in respect to, shares of its common
                        stock or redeemed or purchased any shares of its common
                        stock;

                  ii)   Increased the compensation or the rate of compensation
                        or commissions payable, or to become payable to Sellers,
                        any director or officer, or caused:

                        a)    Any general increase in the compensation or in the
                              rate of compensation payable or to become payable
                              to employees, or


                                       6


                        b)    Any payment of any bonus, profit-sharing or other
                              extraordinary compensation to any Sellers or
                              employees;

                  iii)  Made any change in the accounting methods or practices
                        followed by the Company, wrote-up or down any assets, or
                        changed any depreciation or amortization policies or
                        rates theretofore adopted;

                  iv)   Increased any debt, obligation or liability (whether
                        accrued, absolute or contingent, whether or not
                        presently outstanding);

                  v)    Sold, assigned, licensed, leased, abandoned, mortgaged,
                        pledged or subjected to any lien, security interest or
                        other charges or encumbrances or otherwise disposed of,
                        other than in the ordinary course of business, any
                        machinery, equipment, operating properties or other
                        assets, tangible or intangible;

                  vi)   Issued, sold, purchased or acquired any shares of its
                        stock, warranties, options, notes, or other corporate
                        securities, or borrowed any money or guaranteed or
                        become surety on any obligation;

                  vii)  Discharged or satisfied any lien or encumbrance, or paid
                        any obligation or liability (absolute or contingent)
                        other than current liabilities;

                  viii) Used less than its best efforts to preserve the goodwill
                        of its suppliers, distributors, and customers;

                  ix)   Adopted or amended any collective bargaining, bonus,
                        profit sharing, compensation, stock option, pension,
                        retirement, deferred compensation or other plan,
                        agreement, trust, fund or arrangement for the benefit of
                        employees;

                  x)    Adopted any shareholder or board of director resolutions
                        taking action out of the ordinary course, except for
                        resolutions with respect to the transactions
                        contemplated by this Stock Purchase Agreement or
                        reasonably related thereto;


                                       7


                  (xi)  Suffered any physical damage, destruction or other
                        casualty loss (whether or not covered by insurance)
                        affecting any of the Assets of the Company in an
                        aggregate amount exceeding $25,000;

                  (xii) Made any purchase of any assets from any person or
                        entity, or disposed of, or incurred a lien on, any
                        Company assets, other than acquisitions or dispositions
                        of inventory in the ordinary course of business
                        consistent with past practice;

                 (xiii) Entered into, amended, modified, terminated (partial or
                        complete) or granted a waiver under or gave any consent
                        with respect to (i) any Contract which is required (or
                        had it been in effect on the date hereof would have been
                        required) to be disclosed in Exhibit N, (ii) any license
                        held by Company, or (iii) any intellectual property
                        rights owned by the Company;

                  (xiv) Made any capital expenditures or commitments for
                        additions to property, plant or equipment of Company
                        constituting capital assets in an aggregate amount
                        exceeding $10,000;

                  (xv)  Commenced, terminated or changed any line of business of
                        Company;

                  xvi)  Loaned money or property to, or engaged in any other
                        transaction with, any officer, shareholder, director,
                        employee, consultant or agent, or any affiliate or any
                        shareholder, officer or director; or

                  xvii) Entered into any transactions other than in the ordinary
                        course of business, or agreed to do or to engaging any
                        of the foregoing.

            l.    Title to Properties: Exhibit M contains a list of all real and
                  personal property of Company. Company has good and marketable
                  title to, and complete right to possession of, all of its real
                  and personal properties, tangible and intangible:

                  i)    Reflected in its books and records and in the Financial
                        Statements,

                  ii)   Used in the operation of its ordinary business
                        activities, or


                                       8


                  iii)  In possession of Company at any time during the period
                        beginning January 1, 1998 and ending on the Closing
                        Date, free and clear of all security interests, liens,
                        encumbrances, mortgages, pledges, equities, charges,
                        security interests, title retention agreements,
                        assessments, covenants, restrictions, liabilities and
                        other burdens of every nature, except unpaid, current
                        (not delinquent) taxes of record, all as set forth on
                        Exhibit M.

            m.    Contracts, Leases, Etc.: Set forth on Exhibit N is a list of
                  all:

                  i)    Contracts, agreements, or commitments involving payments
                        of receipts of more than $100 in the case of any single
                        contract, agreement or commitment, or $500 in the
                        aggregate,

                  ii)   Leases with respect to any real or personal property,

                  iii)  Agreements and/or licenses with or from any federal,
                        state, municipal or foreign government or agency, and

                  iv)   Indentures, agreements, notes, mortgages, guarantees or
                        other writings which evidence or relate to the borrowing
                        of money or indebtedness by the Company.

                  All items described in Exhibit N are valid, binding and in
                  full force and effect; and true and complete copies of all
                  written agreements shall be delivered to Buyer prior to
                  Closing.

            n.    Taxes: Company has filed all federal, state and local tax
                  returns required to be filed, such returns are complete and
                  correct, and all taxes shown by such returns or claimed by any
                  taxing authority to be due and payable have been paid,
                  including all income, payroll, sales and employment tax
                  returns. Except to the extent that provisions therefor are
                  specifically reflected on the Financial Statements, there are
                  no federal, state or local tax liabilities due or which will
                  become due for any period commencing prior to the date of the
                  Financial Statements. Sellers shall have complete access to
                  all tax records for purposes of making copies and addressing
                  any audit or other tax return.

                  No taxing authority is now asserting or threatening to assert
                  against Company any deficiency, claim or liability for
                  additional taxes or any adjustment of taxes, and there is no
                  reasonable basis for any such assertion of which Sellers


                                       9


                  should reasonably be aware. No issues have been raised in any
                  examination by any taxing authority with respect to Company
                  which, by application of similar principles, reasonably could
                  be expected to result in a proposed deficiency for any other
                  period not so examined. The federal income tax returns of
                  Company disclose (in accordance with Section 6662(d)(2)(B) of
                  the Internal Revenue Code ("Code")) all positions taken
                  therein that could give rise to a substantial understatement
                  of federal income tax within the meaning of Section 6662(d) of
                  the Code. No claim has been made by any taxing authority in a
                  jurisdiction in which the Company does not file tax returns
                  that it is or may be subject to taxation by that jurisdiction.
                  Exhibit O lists all federal, state, local and foreign income
                  Tax Returns filed by or with respect to the Company for all
                  taxable periods ended on or after March 31, 1995, indicates
                  those Tax Returns, if any, that have been audited, and
                  indicates those Tax Returns that currently are the subject of
                  audit. Sellers have delivered to Buyer complete and correct
                  copies of all federal, state, local and foreign income Tax
                  Returns filed by or with respect to, and all Tax examination
                  reports and statements of deficiencies assessed against or
                  agreed to by, Company since March 31, 1995. There are no liens
                  for taxes upon the assets of Company. Company is not (i) a
                  party to or bound by any obligations under any tax sharing,
                  tax indemnity or similar agreement or arrangement, (ii)
                  subject to any election under Sections 338(e) or 341(f) of the
                  Code or the regulations thereunder, (iii) required to make, or
                  reasonably expects that it might have to make, any adjustment
                  under Section 481 of the Code (or any comparable provision of
                  state, local or foreign law) by reason of a change in
                  accounting method or otherwise, (iv) subject to any agreement
                  or arrangement that could result separately or in the
                  aggregate in the payment of any "excess parachute payments"
                  within the meaning of Section 280G of the Code, (v) and at no
                  time has ever been, a "United States real property holding
                  corporation" within the meaning of Section 897(c)(2) of the
                  Code, (vi) a party to any "safe harbor lease" that is subject
                  to the provisions of Section 168(f)(8) of the Internal Revenue
                  Code as in effect prior to the Tax Reform Act of 1986 or to
                  any "long-term contract" within the meaning of Section 460 of
                  the Code, (vii) a party to any joint venture, partnership or
                  other arrangement that is treated as a partnership for federal
                  income tax purposes, or (viii) nor are they a member of any
                  affiliated, consolidated, combined, unitary or similar group
                  for any tax purpose except for the consolidated return of
                  Company.

            o.    Insurance: Set forth as Exhibit P, which is attached hereto
                  and by this reference incorporated herein, is a true and
                  accurate schedule setting forth all insurance policies
                  maintained by Company on its properties, assets, business and
                  personnel; all of said insurance policies are in full force
                  and effect, and all premiums due thereon have been paid, or
                  the unpaid


                                       10


                  amounts thereof shall be reflected in the Financial Statements
                  (and listed prior to Closing), and Company has received no
                  notice of cancellation of such policies. Company has
                  maintained since 1994 and is now maintaining with financially
                  responsible insurance companies amounts and coverages of
                  insurance against risk and losses reasonably prudent for its
                  business; said policies shall be maintained in full force and
                  effect up to and including the date of the Closing.

            p.    Employee Benefit Plans and Labor Matters: The Company has
                  entered into, and is not otherwise a party (either directly or
                  indirectly) to, any deferred compensation plans, profit
                  sharing plans, pension plans, insurance plans, employee bonus
                  compensation plans, or any other employee benefit plans, or to
                  any collective bargaining agreement except those shown on
                  Exhibit Q. Except as disclosed on Exhibit Q:

                  i)    each benefit plan, and the administration thereof,
                        complies, and has at all times complied, with the
                        requirements of all applicable law, including ERISA and
                        the Code, and each benefit plan intended to qualify
                        under Section 401(a) of the Code has at all times since
                        its adoption been so qualified, and each trust which
                        forms a part of any such plan has at all times since its
                        adoption been tax-exempt under Section 501(a) of the
                        Code;

                  ii)   no benefit plan has incurred any "accumulated funding
                        deficiency" within the meaning of Section 302 of ERISA
                        or Section 412 of the Code;

                  iii)  no direct, contingent or secondary liability has been
                        incurred or is expected to be incurred by the Company or
                        MWFA under Title IV of ERISA to any party with respect
                        to any benefit plan, or with respect to any other plan
                        presently or heretofore maintained or contributed to by
                        any ERISA affiliate;

                  iv)   the "amount of unfunded benefit liabilities" within the
                        meaning of Section 4001(a)(18) of ERISA does not exceed
                        zero with respect to any benefit plan subject to Title
                        IV of ERISA;

                  v)    no "reportable event" (within the meaning of Section
                        4043 of ERISA) has occurred with respect to any benefit
                        plan or any plan maintained by an ERISA affiliate since
                        the effective date of said Section 4043;


                                       11


                  vi)   no benefit plan is a multi employer plan within the
                        meaning of Section 3(37) of ERISA;

                  vii)  neither the Company, MWFA, nor any ERISA affiliate has
                        incurred any liability for any tax imposed under Section
                        4971 through 4980B of the Code or civil liability under
                        Section 502(i) or (l) of ERISA;

                  viii) no benefit under any benefit plan, including, without
                        limitation, any severance or parachute payment plan or
                        agreement, will be established or become accelerated,
                        vested or payable by reason of any transaction
                        contemplated under this Agreement;

                  ix)   no tax has been incurred under Section 511 of the Code
                        with respect to any benefit plan (or trust or other
                        funding vehicle pursuant thereto);

                  x)    no benefit plan provides health or death benefit
                        coverage beyond the termination of an employee's
                        employment, except as required by Part 6 of Subtitle B
                        of Title I of ERISA or Section 4980B of the Code or any
                        state laws requiring continuation of benefits coverage
                        following termination of employment;

                  xi)   no suit, actions or other litigation (excluding claims
                        for benefits incurred in the ordinary course of plan
                        activities) have been brought or, to the knowledge of
                        Sellers, threatened against or with respect to any
                        benefit plan and there are not facts or circumstances
                        known to Sellers that could reasonably be expected to
                        give rise to any such suit, action or other litigation;
                        and

                  xii)  all contributions to benefit plans that were required to
                        be made under such benefit plans have been made, and all
                        benefits accrued under any unfunded benefit plan have
                        been paid, accrued or otherwise adequately reserved in
                        accordance with GAAP, and the Company and MWFA have
                        performed all material obligations required to be
                        performed under all benefit plans.

            q.    Access to Books, Records, Equipment: Between the date hereof
                  and the Closing, Sellers shall cause the Company to allow
                  Buyer and its representatives, including Ernst & Young, LLP,
                  during normal business hours at Company's places of business,
                  free and full access to the Company's books, records,
                  documents, employees, minute books, buildings, equipment, and
                  properties, and to furnish all such information concerning the
                  Company's


                                       12


                  affairs as Buyer may request, from time to time, all subject
                  to the executed confidentiality agreement. The minute all
                  books and similar records contain a true and complete record
                  of all actions of the directors and stockholders of the
                  Company and of MWFA and are true and accurate.

            r.    Notice of Certain Events; Best Efforts: Promptly upon the
                  occurrence of, or promptly upon their becoming aware of the
                  impending or threatened occurrence of, any event which would
                  cause or constitute any breach of any of Sellers'
                  representation, warranties, covenants, agreements or
                  conditions contained in this Agreement, Sellers shall give
                  detailed written notice thereof to Buyer, and Sellers shall
                  use their best efforts to prevent or promptly remedy the same.

            s.    Further Assurances: Sellers shall promptly and duly execute
                  and deliver to Buyer such further documents and assurances and
                  take such further action as Buyer may from time to time
                  reasonably request in order to carry out more effectively the
                  intent and purpose of this Agreement and to establish and
                  protect the rights and remedies created or intended to be
                  created in favor of Buyer and/or Company and MWFA. Such
                  assurances shall include the execution and delivery of
                  management representation letters by appropriate officers of
                  the Company to Ernst & Young, LLP, with respect to the two
                  most recent fiscal years, and copies of the Company's legal
                  response letters to auditors for the same period.

            t.    Intellectual Property Rights: The Company has interests in or
                  uses only the intellectual property described in Exhibit R.
                  The Company either has all right, title and interest in or a
                  valid and binding license to use such intellectual property.
                  No other intellectual property is used in or necessary to the
                  conduct of the business of the Company. All registrations,
                  pending applications, registered rights and executed
                  agreements related to intellectual property are listed in
                  Exhibit R. Except as disclosed therein, (i) the Company has
                  the right to use the intellectual property described therein,
                  (ii) all registrations on behalf of the Company with and
                  applications to governmental or regulatory authorities in
                  respect of such intellectual property are valid and in full
                  force and effect and are not subject to the payment of any
                  Taxes or maintenance fees or the taking of any other actions
                  by the Company to maintain their validity or effectiveness,
                  (iii) all copyrightable materials used by the Company are
                  works-for-hire and are owned by the Company, (iv) there are no
                  restrictions on the direct or indirect transfer of any
                  License, or any interest therein, held by the Company in
                  respect of such intellectual property, (v) the Sellers have
                  delivered, or have caused the Company to


                                       13


                  deliver, to Buyer prior to the execution of this Agreement
                  documentation with respect to any invention, process, design,
                  computer program or other know-how or trade secret included in
                  such intellectual property, which documentation is accurate
                  and complete and sufficient in detail and content to identify
                  and explain such invention, process, design, computer program
                  or other know-how or trade secret, (vi) the Sellers and the
                  Company have taken reasonable security measures to protect the
                  secrecy, confidentiality and value of their trade secrets,
                  (vii) neither any Seller nor the Company is or has received
                  any notice that it is, in default (or with the giving of
                  notice or lapse of time or both, would be in default) under
                  any License to use such intellectual property and (viii)
                  neither any Seller nor the Company has any knowledge that such
                  intellectual property is being infringed by any other person.
                  To the knowledge of each Seller and the Company, the Company
                  is not infringing any intellectual property of any person or
                  entity, and no litigation is pending and no claim has been
                  made or, to the knowledge of any Seller or of the Company, has
                  been threatened to such effect.

            u.    Disclosure: The representations and warranties contained in
                  this Agreement, and the statements contained in the exhibits
                  and in the certificates, lists and other writings furnished to
                  Buyer pursuant to any provision of this Agreement (including
                  the Financial Statements), when taken together, do not contain
                  any untrue statement of a material fact or omit to state a
                  material fact necessary in order to make the statements herein
                  and therein, in the light of the circumstances under which
                  they were made, not misleading.

            v.    Environmental Matters:

                  i)    The Company and MWFA have obtained and hold all
                        necessary Environmental Permits.

                  ii)   Except as disclosed on Exhibit S:

                        (a)   Company and MWFA are, and at all times have been,
                              in full compliance with, and have not been and are
                              not in violation of or liable under, any
                              environmental law. Neither any Seller not the
                              Company nor MWFA has any basis to expect, nor has
                              any of them or any other person for whose conduct
                              it may be held to be responsible received, any
                              actual or threatened order, notice, or other
                              communication from any governmental body, or the
                              current or prior owner or operator of any assets,
                              of any actual or potential violation or failure to
                              comply with any environmental law, or of any
                              actual or threatened obligation


                                       14


                              to undertake or bear the cost of any environmental
                              liabilities with respect to any of the properties
                              or assets (whether real, personal, or mixed) in
                              which the Company or MWFA has had an interest, or
                              with respect to any property at or to which
                              hazardous materials were generated, manufactured,
                              refined, transferred, imported, used, or processed
                              by the Company or MWFA or any other person for
                              whose conduct they are or may be held responsible,
                              or from which hazardous materials have been
                              transported, treated, stored, handled,
                              transferred, disposed, recycled, or received.

                        (b)   There are no pending or, to the knowledge of any
                              Seller, threatened claims, encumbrances, or other
                              restrictions of any nature, resulting from any
                              environmental liabilities or arising under or
                              pursuant to any environmental law, with respect to
                              or affecting any of the properties and assets
                              (whether real, personal, or mixed) in which
                              Company or MWFA has or had an interest.

                        (c)   Neither any Seller nor the Company has knowledge
                              of or any basis to expect, nor has any of them or
                              any other person for whose conduct they are or may
                              be held responsible received any citation,
                              directive, inquiry, notice, order, summons,
                              warning, or other communications that relates to
                              Hazardous Activity, Hazardous Materials, or any
                              alleged, actual, or potential violation or failure
                              to comply with any Environmental Law, or of any
                              Environmental, Health, and Safety Liabilities with
                              respect to any of its facilities or any other
                              assets in which the Company had an interest, or
                              with respect to any facility to which Hazardous
                              Materials generated, manufactured, refined,
                              transferred, imported, used, or processed by any
                              Seller, the Company, or any other person for whose
                              conduct it or they are or may be held responsible,
                              have been transported, treated, stored, handled,
                              transferred, disposed, recycled, or received.

                        (d)   Neither the Company nor any other person for whose
                              conduct it may be held responsible, has any
                              Environmental, Health, and Safety Liabilities with
                              respect to the Facilities or with respect to any
                              other assets (whether real, personal, or mixed) in
                              which Company (or any


                                       15


                              predecessor thereof), has or had an interest, or
                              at any property geologically or hydrologically
                              adjoining the facilities or any such assets.

                  iii)  There are no hazardous materials present on or in the
                        environment at Company's and MWFA's properties or at any
                        geologically or hydrologically adjoining property,
                        including any hazardous materials contained in barrels,
                        above or underground storage tanks, landfills, land
                        deposits, dumps, equipment (whether moveable or fixed)
                        or other containers, either temporary or permanent, and
                        deposited or located in land, water, sumps, or any other
                        part of the property or such adjoining property, or
                        incorporated into any structure therein or thereon.
                        Neither the Company, MWFA, nor any other person for
                        whose conduct it may be held responsible, has permitted
                        or conducted, or is aware of, any hazardous activity
                        conducted with respect to the property or any other
                        properties or assets (whether real, personal, or mixed)
                        in which Company or MWFA has or had an interest except
                        in full compliance with all applicable environmental
                        laws.

                  iv)   There has been no release or, to the knowledge of any
                        Seller, any threat of release of any hazardous materials
                        at or from the property or at any other locations where
                        any hazardous materials were generated, manufactured,
                        refined, transferred, produced, imported, used, or
                        processed from or by the property, or from or by any
                        other properties and assets (whether real, personal, or
                        mixed) in which the Company and MWFA has or had an
                        interest, or any geologically or hydrologically
                        adjoining property.

                  v)    Sellers have delivered to Buyer true and complete copies
                        and results of any reports, studies, analyses, tests,
                        and monitoring possessed or initiated by any Seller or
                        the Company pertaining to hazardous materials or
                        hazardous activities in, on, or under the property, or
                        concerning compliance by any Seller, the Company, MWFA,
                        or any other person for whose conduct it or they are or
                        may be held responsible, with environmental laws.

                  vi)   There are no liens arising under or pursuant to any
                        environmental law on any real property owned or leased
                        and there are no facts, circumstances, or conditions
                        that could reasonably be expected to restrict, encumber,
                        or result in the imposition of special conditions that
                        could reasonably be expected to restrict, encumber, or
                        result in the imposition of special conditions under any


                                       16


                        environmental law with respect to the ownership,
                        occupancy, development, use, or transferability of any
                        real property.

                  vii)  There are no underground storage tanks, active or
                        abandoned, polychlorinated biphenyl containing
                        equipment, or asbestos containing material, at any real
                        property.

                  viii) There have been no environmental investigations,
                        studies, audits, tests, reviews or other analyses
                        conducted by, on behalf of, or which are in the
                        possession of any Seller or the Company or MWFA with
                        respect to any asset of or property that is adjacent to,
                        an asset of the Company or MWFA which have not been
                        delivered to Buyer prior to execution of this Agreement.

            w.    Other Negotiations; Brokers: No Seller (nor any investment
                  banker, financial advisor, attorney, accountant or other
                  person retained by or acting for or on behalf of any Seller)
                  has entered into any agreement or had any discussions with any
                  third party regarding any transaction involving the Company
                  which could result in any party hereto being subject to any
                  claim for liability to said third party as a result of
                  entering into this Agreement or consummating the transactions
                  contemplated hereby.

      6.    REPRESENTATIONS AND WARRANTIES OF BUYER: Buyer represents and
            warrants that:

            a.    Organization: Buyer is a duly organized corporation in good
                  standing with the State of Texas;

            b.    Authority: Buyer has obtained all necessary corporate approval
                  (or will have done so by Closing) to complete this
                  transaction;

            c.    Securities Laws: Buyer has taken all necessary action with
                  respect to this transaction required by securities laws;

            d.    Further Assurances: Buyer shall promptly and duly execute and
                  deliver to Sellers such further documents and assurances and
                  take such further action as Sellers may from time to time
                  reasonably request in order to carry out more effectively the
                  intent and purpose of this Agreement and to establish and
                  protect the rights and remedies created or intended to be
                  created in favor of Sellers.


                                       17


            e.    Other Negotiations; Brokers: Buyer and no investment banker,
                  financial advisor, attorney, accountant or other person
                  retained by or acting for or on behalf of Buyer has entered
                  into any agreement or had any discussions with any third party
                  regarding any transaction involving the Company which could
                  result in any party hereto being subject to any claim for
                  liability to said third party as a result of entering into
                  this Agreement or consummating the transactions contemplated
                  hereby.

      7    REPRESENTATIONS, WARRANTIES, AND COVENANTS:

            a.    Accuracy; Survival: The representations, warranties, and
                  covenants, made by Sellers and Buyer herein shall be true and
                  correct in all respects on, and as of, the Closing Date with
                  the same force and effect as though all such representations
                  and warranties had been made on and as of the Closing Date and
                  the covenants required by this Stock Purchase Agreement to be
                  performed and complied with by Sellers on or prior to the
                  Closing shall have been duly performed or complied with. All
                  representations, warranties and covenants shall survive the
                  Closing, unless otherwise provided herein.

            b.    Non-Compete:

                  (i)   For a period of five (5) years from the Closing Date,
                        except as requested by Buyer or furnished pursuant to
                        Exhibit D, no Seller, alone or in conjunction with any
                        other person, or directly or indirectly through his or
                        her present or future affiliates, will directly or
                        indirectly own, manage, operate, join, have a financial
                        interest in, control or participate in the ownership,
                        management, operation or control of, or use or permit
                        his or her name to be used in connection with, or be
                        otherwise connected in any manner with, (A) any business
                        or enterprise engaged in the design, development,
                        manufacture, distribution or sale of any products, or
                        the provision of any services, which the Company was
                        designing, developing, manufacturing, distributing,
                        selling or providing at any time subsequent to December
                        31, 1996 up to and including the Closing Date, or (B)
                        any business which is similar to the business of
                        disposing or selling coal combustion by-products or
                        competitive with the business carried on or planned by
                        Company at any time subsequent to December 31, 1996 up
                        to and including the Closing Date, provided that the
                        foregoing restriction shall not be construed to prohibit
                        the ownership, in the aggregate, of not more than two
                        percent (2%) of any class of securities of any
                        corporation which is engaged in any of the businesses or
                        enterprises described in clauses (A) and (B) above,
                        having a class of securities registered pursuant to the


                                       18


                        Securities Exchange Act of 1934, as amended, which
                        securities are publicly owned and regularly traded on
                        any national exchange or in the over-the-counter market.

                  (ii)  For a period of five (5) years from the Closing Date, no
                        Seller shall directly or indirectly, or through an
                        affiliate, (A) influence any individual who was an
                        employee or consultant of the Company at any time during
                        the time any Seller was an indirect or direct owner of
                        securities of the Company, to terminate his or her
                        employment or consulting relationship with the Company,
                        (B) interfere in any other way with the employment, or
                        other relationship, of any employee or consultant of the
                        Company or (C) cause or attempt to cause or participate
                        in any way in any discussion or negotiation concerning
                        (X) any client, customer or supplier of the Company or
                        (Y) any prospective client, customer or supplier of the
                        Company from engaging in business with the Company.

                  (iii) Each Seller agrees that Buyer's remedies at law for any
                        breach or threat of breach by it of any of the
                        provisions of this Section 7.b will be inadequate, and
                        that, in addition to any other remedy to which Buyer may
                        be entitled at law or in equity, Buyer shall be entitled
                        to a temporary or permanent injunction or injunctions or
                        temporary restraining orders or orders to prevent
                        breaches of the provisions of this Section 7.b and to
                        enforce specifically the terms and provisions hereof, in
                        each case without the need to post any security or bond.
                        Nothing herein contained shall be construed as
                        prohibiting Buyer from pursuing, in addition, any other
                        remedies available to it for such breach or threatened
                        breach. A waiver by the Buyer of any breach of any
                        provision hereof shall not operate or be construed as a
                        waiver of a breach of any other provisions of this
                        Agreement or of any subsequent breach thereof.

                  (iv)  The parties hereto consider the restrictions contained
                        in this Section 7.b hereof to be reasonable for the
                        purpose of preserving the goodwill, proprietary rights
                        and going concern value of Company, but if a final
                        judicial determination is made by a court having
                        jurisdiction that the time or territory or any other
                        restriction contained in this Section 7.b is an
                        unenforceable restriction on the Sellers' activities,
                        the provisions of this Section 7.b shall not be rendered
                        void but shall be deemed amended to apply as to such
                        maximum time and territory and to such other extent as
                        such court


                                       19


                        may judicially determine or indicate to be reasonable.
                        Alternatively, if the court referred to above finds that
                        any restriction contained in this Section 7.b or any
                        remedy provided herein is unenforceable, and such
                        restriction or remedy cannot be amended so as to make it
                        enforceable, such finding shall not affect the
                        enforceability of any of the other restrictions
                        contained therein or the availability of any other
                        remedy. The provisions of this Section 7.b shall in no
                        respect limit or otherwise affect the Sellers
                        obligations under other agreements with the Company.

      8.    TERMINATION:

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

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

                  ii)   (i) by Buyer if any of the conditions contained in this
                        Agreement to be performed by Sellers 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 Sellers, if any of the contained in this
                        Agreement to be performed by Buyer 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 a Seller to comply with his or
                        her obligations under this Agreement) and Sellers have
                        not waived such condition on or before the Closing Date;

                  iii)  by mutual consent of Buyer and Sellers; or

                  iv)   by Buyer or by Sellers 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 April 30,
                        1998, or such later date as the parties may agree upon.

            b.    Effect of Termination: Each party's right of termination under
                  Section 8.a 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


                                       20


                  8.a, all further obligations of the parties under this
                  Agreement will terminate, except that the obligations in
                  Sections 10.a, 10.k and 18 will survive; provided, however,
                  that if this Agreement is terminated by a party because of a
                  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 (including specific performance) will survive such
                  termination unimpaired.

      9.    WAIVERS: Either Buyer or Sellers may, by written notice to the other
            party hereto, extend the time for performance of any of the
            obligations or other actions of the other parties under this
            Agreement, or waive any inaccuracies in this representations and
            warranties of the other contained in this Agreement or in any
            documents delivered pursuant to this Agreement, or waive compliance
            with any of the conditions or covenants of the other contained in
            this Agreement, or waive or modify performance of any of the
            obligations of the other parties under this Agreement, which written
            notice must delineate with specificity, such waiver. Except as
            provided in the preceding sentence, no action taken pursuant to this
            Agreement, including, without limitation, any investigation or
            action by or on behalf of any party, shall constitute a waiver by
            any party taking such action of compliance with any representations,
            warranties, covenants or agreements set forth in this Agreement. The
            waiver by any party hereto of a breach of any provision of this
            Agreement shall not operate or be construed as a waiver of any
            subsequent breach of such provision.

      10.   MISCELLANEOUS: Buyer and Sellers hereby agree to the following
            miscellaneous provisions:

            a.    Cost; Expenses: Buyer and Sellers shall each bear their own
                  respective costs and expenses incurred in connection with this
                  Stock Purchase Agreement, including, but not limited to
                  attorney and accountant fees. Seller shall be solely
                  responsible for any sales, stock transfer or other transfer
                  taxes related to the consummation or the principal transaction
                  contemplated by this Stock Purchase Agreement. Buyer will be
                  responsible for all compliance costs and expenses related to
                  its public registration. Notwithstanding anything herein or
                  contained in any other agreement, neither Sellers nor Buyer
                  makes any representation that may be relied upon by any third
                  party.


                                       21


            b.    Notices: Any notice or other communication required or
                  permitted by any provision of this Agreement shall be in
                  writing and shall be deemed to have been given or served for
                  all purposes:

                  i)    When delivered by hand or sent by facsimile; or

                  ii)   When delivered by prepaid nationally recognized courier
                        service; or

                  iii)  If sent by certified mail, postage prepaid, return
                        receipt requested, when 3 days have elapsed after such
                        mailing:

                  To Buyer:

                  JTM, Inc.
                  127 South 500 East, Suite 675
                  Salt Lake City, UT 84102
                  Attn:  Brett A. Hickman
                  Fax - (801) 323-8035

                  With a copy to:

                  Parsons, Behle & Latimer
                  201 South Main Street, Suite 1800
                  Salt Lake City, UT 84145
                  Attn: J. Gordon Hansen
                  Fax - (801) 536-6111

                  To Sellers:

                  with a copy to:

                  Daniel D. Dykstra
                  701 Pierce Street, Suite 200
                  P.O. Box 3086
                  Sioux City, IA 51102-3086
                  Fax - (712) 258-6714


                                       22


                  or such other address as any of the parties hereto shall have
                  designated in writing for notices in accordance with this
                  paragraph.

            c.    Successors and Assigns: This Stock Purchase Agreement shall
                  inure to the benefit of, and be binding upon, the parties
                  hereto and their respective heirs, successors and assigns. No
                  assignment by Buyer may be made without the prior written
                  consent of Sellers, except to an affiliate of Buyer. Any
                  Seller may assign his rights hereunder, but no such assignment
                  shall diminish his liabilities or commitments contained
                  herein.

            d.    Entire Agreement: This Agreement (including the exhibits
                  hereto) sets forth the entire understanding and agreement of
                  the parties hereto with respect to the subject matters covered
                  hereby and supersedes all prior or contemporaneous agreements,
                  arrangements, letters of intent or communications, whether
                  oral or written in form. This Agreement is made in fulfillment
                  of a Letter of Understanding dated February 20, 1998.

            e.    Amendments: This Agreement shall not be modified or amended
                  except by written agreement executed by the parties hereto.

            f.    Counterparts: This Agreement may be executed in any number of
                  counterparts, all of which shall be considered one and the
                  same agreement.

            g.    Governing Law: This Agreement shall be governed by and
                  construed in accordance with the laws of the State of Iowa.

            h.    Partial Invalidity: If any provision of this Agreement shall
                  be or become illegal, invalid or unenforceable in whole or in
                  part, the remaining provisions of this Agreement shall
                  nevertheless be deemed valid, binding, subsisting and
                  enforceable.

            i.    Delay; Partial Exercise: No failure or delay by any party
                  hereto in exercising any right, power or privilege under this
                  Agreement shall operate as a waiver thereof; nor shall any
                  single or partial exercise of any right, power or privilege
                  hereunder preclude any other or further exercise thereof or
                  the exercise of any other right, power or privilege.

            j.    Authority: Irving F. Jensen, Jr. Shall be authorized to act on
                  behalf of all Sellers with respect to any election, notice or
                  other matter concerning this Agreement, and through the
                  Closing Buyer may rely on any


                                       23


                  written statement from him as having been authorized by all
                  Sellers, even though not confirmed by the other Sellers.

            k.    Confidentiality: Buyer and each of the Sellers will hold in
                  strict confidence from any person or entity all documents and
                  information concerning the other party hereto furnished to it
                  by or on behalf of the other party in connection with this
                  Agreement or the transactions contemplated hereby, except to
                  the extent the disclosing party can demonstrate that such
                  documents or information was (1) previously known by the party
                  receiving such documents or information, (2) in the public
                  domain (either prior to or after the furnishing of such
                  documents or information hereunder) through no fault of such
                  receiving party or (3) later acquired by the receiving party
                  from another source if the receiving party is not aware that
                  such source is under an obligation to another party hereto to
                  keep such documents and information confidential. Such
                  covenant of confidentiality will remain in effect unless a
                  party is compelled to disclose by judicial or administrative
                  process (including in connection with obtaining the necessary
                  approvals of this Agreement and the transactions contemplated
                  hereby of governmental or regulatory authorities) or by other
                  requirements of law.

      11.   INDEMNIFICATION:

            a.    Each of the Sellers, jointly and severally, will indemnify the
                  Company. Buyer and their respective stockholders (other than
                  Sellers) and the officers, directors, employees, agents and
                  affiliates of each of them in respect of and hold each of them
                  harmless from and against, any and all losses suffered,
                  incurred or sustained by any of them or to which any of them
                  becomes subject, resulting from, arising out of relating to
                  any misrepresentation or breach of warranty or nonfulfillment
                  of or failure to perform any covenant or agreement on the a
                  part of any Sellers contained in this Agreement (including,
                  without limitation, any certificate delivered in connection
                  herewith or therewith).

            b.    Buyer will indemnify each of the Sellers in respect of, and
                  hold him or her harmless from and against, any and all losses
                  suffered, incurred or sustained by him or her or to which he
                  or she becomes subject, resulting from, arising out of or
                  relating to any misrepresentation or breach of warranty or
                  nonfulfillment of or failure to perform any covenant or
                  agreement on the part of Buyer contained in this Agreement
                  (including, without limitation, any certificate delivered in
                  connection herewith or therewith).

            c.    Notwithstanding anything in this Agreement to the contrary,
                  Sellers' obligations, including taxes and penalties and paid
                  costs of defense


                                       24


                  under this indemnity agreement shall be limited and, if
                  finally determined to be owed, to $2,500,000, except that
                  Seller's obligations related in any way to assets transferred
                  by the Company to Sellers, pursuant to Section 4.e, income tax
                  liabilities with respect to the Company's short year ending on
                  the Closing Date, and any willful, intentional or fraudulent
                  act, are not limited.

      12.   METHOD OF ASSERTING CLAIMS: All claims for indemnification will be
            asserted and resolved as follows:

            a.    In order for a party to be entitled to any indemnification
                  arising out of or involving a claim or demand made by any
                  person not a party to this Agreement against the indemnified
                  party (a "Third Party Claim"), the indemnified party shall
                  deliver a claim notice to the indemnifying party promptly
                  after receipt by such indemnified party of written notice of
                  the Third Party Claim; provided, that failure to give such
                  Claim Notice shall not affect the indemnification provided
                  hereunder except to the extent the indemnifying party shall
                  have been actually prejudiced as a result of such failure.

            b.    If a Third Party Claim is made against an indemnified party,
                  the indemnifying party shall be entitled to participate in the
                  defense thereof and, if it so chooses, to assume the defense
                  thereof with counsel selected by the indemnifying party, which
                  counsel must be reasonably satisfactory to the indemnified
                  party. Should the indemnifying party so elect to assume the
                  defense of a Third Party Claim, the indemnifying party shall
                  not be liable to the indemnified party for legal expenses
                  subsequently incurred by the indemnified party in connection
                  with the defense thereof, but shall continue to pay for any
                  expenses of investigation or any loss suffered. If the
                  indemnifying party assumes such defense, the indemnified party
                  shall have the right to participate in the defense thereof and
                  to employ counsel, at its own expense, separate from the
                  counsel employed by the indemnifying party. If (i) the
                  indemnifying party shall not assume the defense of a Third
                  Party Claim with counsel satisfactory to the indemnified party
                  within five business days of any claim notice, or (ii) legal
                  counsel for the indemnified party notifies the indemnifying
                  party that there are or may be legal defenses available to the
                  indemnifying party or to other indemnified parties which are
                  different from or additional to those available to the
                  indemnified party, which, if the indemnified party and the
                  indemnifying party were to be represented by the same counsel,
                  would constitute a conflict of interest for such counsel or
                  prejudice prosecution of the defenses available to such
                  indemnified party, or (iii) if the indemnifying party shall
                  assume the defense


                                       25


                  of a Third Party Claim and fail to diligently prosecute such
                  defense, then in each such case the indemnified party, by
                  notice to the indemnifying party, may employ its own counsel
                  and control the defense of the Third Party Claim and the
                  indemnifying party shall be liable for the reasonable fees,
                  charges and disbursements of counsel employed by the
                  indemnified party, and the indemnified party shall be promptly
                  reimbursed for any such fees, charges and disbursements, as
                  and when incurred. Whether the indemnifying party or the
                  indemnified party control the defense of any Third Party
                  Claim, the parties hereto shall cooperate in the defense
                  thereof. Such cooperation shall include the retention and
                  provision to the counsel of the controlling party of records
                  and information which are reasonably relevant to such Third
                  Party Claim, and making employees available on a mutually
                  convenient basis to provide additional information and
                  explanation or any material provided hereunder. The
                  indemnifying party shall have the right to settle, compromise
                  or discharge a Third Party Claim (other than any such Third
                  Party Claim in which criminal conduct is alleged) without the
                  indemnified party's consent if such settlement, compromise or
                  discharge (i) constitutes a complete and unconditional
                  discharge and release of the indemnified party, and (ii)
                  provides for no relief other than the payment of monetary
                  damage and such monetary damages are paid in full by the
                  indemnifying party.

            c.    In the event either party should have a claim that does not
                  involve a Third Party Claim, the indemnified party shall
                  promptly deliver an indemnity notice to the indemnifying
                  party. The failure by any indemnified party to give the
                  indemnity notice shall not impair such party's rights
                  hereunder except to the extent that an indemnifying party
                  demonstrates that it has been prejudiced thereby. If the
                  indemnifying party notifies the indemnified party that it does
                  not dispute the claim described in such indemnity notice or
                  fails to notify the indemnified party within thirty (30) days
                  whether the indemnifying party disputes the claim described in
                  such indemnity notice, the loss in the amount specified in the
                  indemnity notice will be conclusively deemed a liability of
                  the indemnifying party and the indemnifying party shall pay
                  the amount of such loss to the indemnified party on demand. If
                  the indemnifying party has timely disputed its liability with
                  respect to such claim, the indemnifying party and the
                  indemnified party will proceed in good faith to negotiate a
                  resolution of such dispute, and if not resolved through
                  negotiations within thirty (30) days, such dispute shall be
                  resolved as provided herein and by law.

      13.   ALLOCATION OF TAX LIABILITY:

            a.    In the case of taxes with respect to or payable by the Company
                  with respect to a period that includes but does not end on the
                  Closing Date, the allocation of such taxes between the
                  pre-closing period and the post-


                                       26


                  closing period shall be made on the basis of an interim
                  closing of the books of the Company and MWFA as of the close
                  of business on the Closing Date. In the case of (i) franchise
                  taxes based on capitalization, debt or shares of stock
                  authorized, issue or outstanding and (ii) ad valorem taxes, in
                  either situation attributable to any taxable period that
                  includes but does not end on the Closing Date, the portion of
                  such taxes attributable to the pre-closing period shall be the
                  amount of such taxes for the entire taxable period, multiplied
                  by a fraction the numerator of which is the number of days in
                  such taxable period ending on and including the Closing Date
                  and the denominator of which is the entire number of days in
                  such taxable period; provided, that if any company asset is
                  sold or otherwise transferred prior to the Closing Date, then
                  ad valorem taxes pertaining to such property, asset or other
                  right shall be attributed entirely to the pre-closing period.

            b.    Except to the extent a reserve for taxes is reflected on the
                  Financial Statements, the Sellers shall be responsible for and
                  pay and shall indemnify and hold harmless Buyer and the
                  Company and MWFA with respect to (i) any and all taxes imposed
                  on any of the Company, or for which the Company is liable with
                  respect to any periods ending on or before the Closing Date;
                  provided, that in the case of any adjustment to any item of
                  loss or expense for any such years, which gives rise to
                  corresponding and offsetting items of loss or expense in
                  subsequent years the benefit of which is or will be actually
                  realized by the Company (other than upon liquidation of the
                  Company) including by reason of any increase in a net
                  operating loss, the Sellers' obligations shall be limited to
                  the amount of interest (computed at the appropriate statutory
                  rates) and penalties actually paid to the appropriate taxing
                  authorities by the Company as a result of such timing
                  differences in the case of audit adjustments, or at a rate of
                  eight percent (8%) per annum in the case of other adjustments,
                  (ii) without duplication (subject to the same proviso), all
                  taxes arising out of a breach of the representations,
                  warranties or covenants contained herein, (iii) any tax
                  liability resulting from any ongoing state audits that exceed,
                  in the aggregate, any reserve therefore set forth on the
                  Financial Statements, and (iv) any reasonable out-of-pocket
                  costs or expenses with respect to taxes indemnified hereunder.

            c.    From and after the Closing Date, Buyer shall cause the Company
                  and MWFA to prepare, or cause to be prepared, and shall file,
                  or cause to be filed, all reports and returns of the Company
                  required to be filed. Buyer shall cause the Company and MWFA
                  to pay the appropriate taxing authorities the taxes shown to
                  be due and payable on all tax returns of the Company filed
                  after the Closing Date, concurrent with the filing of such tax


                                       27


                  returns. Tax returns of the Company and MWFA for a period
                  ending on or before the Closing Date shall be prepared on a
                  basis consistent with the tax returns filed by the Company for
                  previous taxable periods, subject to the requirements of
                  applicable law.

      14.   TAX CONTESTS:

            a.    If any taxing authority or other person asserts a tax claim,
                  then the party hereto first receiving notice of such tax claim
                  shall promptly provide written notice thereof to the other
                  parties hereto. Such notice shall specify in reasonable detail
                  the basis for such tax claim and shall include a copy of any
                  relevant correspondence received from the taxing authority or
                  other person.

            b.    If, within 30 calendar days after any Seller receives or
                  delivers, as the case may be, notice of a tax claim, Sellers
                  provide to the Buyer an election notice, Sellers shall defend
                  or prosecute, at their sole cost, expense and risk, such tax
                  claim by all appropriate proceedings, which proceedings shall
                  be defended or prosecuted diligently by Sellers to a final
                  determination; provided, that Sellers shall not, without the
                  prior written consent of the Company and MWFA, enter into any
                  compromise or settlement of such tax claim that would result
                  in any tax detriment to the Company and MWFA. So long as
                  Sellers are defending or prosecuting a tax claim, with respect
                  to the Company and MWFA, the Company and MWFA shall provide or
                  cause to be provided to Sellers any information reasonably
                  requested by Sellers relating to such tax claim and shall
                  otherwise cooperate with Sellers and their representatives in
                  good faith in order to contest effectively such tax claim.
                  Sellers shall inform the Company and MWFA of all developments
                  and events relating to such tax claim (including, without
                  limitation, providing copies of written materials relating to
                  such tax claim) and the Company and MWFA or its authorized
                  representatives shall be entitled, at their expense, to
                  attend, but not to participate in or control, all conferences,
                  meetings and proceedings relating to such tax claim.

            c.    If, with respect to any tax claim, Sellers fail to deliver an
                  election notice within the period provided in Section 13.04(b)
                  or, after delivery of such election notice, Sellers fail
                  diligently to defend or prosecute such tax claim to a final
                  determination, then the Company and MWFA shall at any time
                  thereafter have the right (but not the obligation) to defend
                  or prosecute, at the sole cost, expense and risk of Sellers,
                  such tax claim. The Company and MWFA shall have full control
                  of such defense or prosecution and such proceedings, including
                  any settlement or compromise thereof. If requested, the
                  Sellers shall cooperate in good faith with the Company and
                  MWFA and its authorized representatives in order to contest
                  effectively such


                                       28


                  tax claim. Sellers may attend, but not participate in or
                  control, any defense, prosecution, settlement or compromise of
                  any tax claim pursuant to this paragraph, and shall bear their
                  own costs and expenses with respect thereto.

            d.    In the case of any tax claim that is defended or prosecuted to
                  a final determination by Sellers, Sellers shall pay to the
                  appropriate tax indemnitees, the full amount of any tax
                  arising or resulting from such tax claim within five business
                  days after such final determination. In the case of any tax
                  claim that is defended or prosecuted to a final determination
                  by the Company and MWFA pursuant to the terms of Section
                  13.04, Sellers shall pay to the appropriate indemnified party,
                  together with any associated costs that have not theretofore
                  been paid by Sellers to the Company and MWFA, within five
                  business days after such final determination. In the case of
                  any tax claim not covered by the two preceding sentences,
                  Sellers shall pay to the Company and MWFA in immediately
                  available funds the full amount of any tax arising or
                  resulting from such tax claim (calculated after taking into
                  account any actual reduction in the current liability for
                  taxes of such tax indemnitee for tax arising out of or
                  resulting from such payment or such tax claim), together with
                  any associated costs that have not theretofore been paid by
                  Sellers to the Company and MWFA, at least five business days
                  before the date payment of such tax is due from any tax
                  indemnitee.

            e.    Notwithstanding anything contained in this Section 13 to the
                  contrary, the rights of Sellers to defend or prosecute, or to
                  control the defense or prosecution of, any tax claim shall be
                  no greater than those rights that the Company and MWFA would
                  have to defend or prosecute, or to control the defense or
                  prosecution of, such tax claim.

      15.   COOPERATION REGARDING TAX MATTERS: Each party hereto shall provide
            to the other parties hereto and Company and MWFA such cooperation
            and information as any of them reasonably may request related to the
            filing of any tax return, amended tax return or claim for refund,
            determining a liability for taxes or a right to refund of taxes or
            in conducting any audit or other proceeding in respect to taxes.
            Such cooperation and information shall include providing copies of
            all relevant portions of relevant tax returns, together with
            relevant accompanying schedules, workpapers and relevant documents
            relating to rulings or other determinations by taxing authorities
            and relevant records concerning the ownership and tax basis of
            property, which any such party may possess. Each party shall make
            its employees reasonably available on a mutually convenient basis at
            its cost to provide explanation of any documents or information so
            provided. Subject to the


                                       29


            preceding sentence, each party required to file tax returns pursuant
            to this paragraph 13 shall bear all costs of filing such tax
            returns.

      16.   PAYMENT OF TRANSFER TAXES AND FEES: Sellers shall pay all sales,
            use, transfer, stamp, documentary or similar taxes imposed upon or
            arising out of or in connection with the transactions effected
            pursuant to this Agreement.

      17.   OTHER TAX COVENANTS:

            a.    Without the prior written consent of Buyer, no Seller shall,
                  to the extent it may affect or relate to the Company or MWFA,
                  make or change any tax election, change any annual tax
                  accounting period, adopt or change any method of tax
                  accounting, file any amended tax return, enter into any method
                  of tax accounting, enter into any closing agreement, settle
                  any tax claim, assessment or proposed assessment, surrender
                  any right to claim a tax refund, consent to any extension or
                  waiver of the limitation period applicable to any tax claim or
                  assessment or take or omit to take any other action, if any
                  such action or omission would have the effect of increasing
                  any post-closing tax liability of the Buyer, of the Company or
                  MWFA unless required by applicable law.

            b.    Without the prior written consent of Sellers, neither the
                  Buyer nor the Company or MWFA shall, to the extent it may
                  affect or relate to the Company or MWFA, make or change any
                  tax election, file any amended tax return, enter into any
                  closing agreement, settle any tax claim, assessment or
                  proposed assessment, surrender any right to claim a tax
                  refund, consent to any extension or waiver of the limitation
                  period applicable to any tax claim or assessment or take or
                  omit to take any other action, if any such action or omission
                  would affect a pre-closing period, unless required by
                  applicable law.

            c.    So long as any books, records and files retained by any Seller
                  relating to the business of the Company or MWFA or the books,
                  records and files delivered to the control of the Buyer
                  pursuant to this Agreement to the extent they relate to the
                  operations of the Company or MWFA prior to the Closing Date,
                  remain in existence and are available, each party (at its own
                  expense) shall have the right upon prior notice to inspect and
                  to make copies of the same at any time during business hours
                  for any proper purpose. The Buyer and the Sellers shall use
                  reasonable efforts not to destroy or all the destruction of
                  any such books, records, and files without first providing 60
                  days written notice of intention to destroy to the other, and
                  allowing such other party to take possession of such records.


                                       30


      18.   MEDIATION: In the event there is a dispute under the Agreement, the
            disagreeing parties shall meet with one another and diligently
            attempt to resolve their disagreements. If they are unable to do so,
            then upon request of either party to the dispute made within twenty
            (20) days of the failure of negotiations, they will mediate the
            dispute, utilizing an impartial mediator pursuant to the rules of
            the American Arbitration Association ("AAA") or any other reputable
            organization that sponsors mediation. If, after thirty (30) days the
            mediation is not successful, or if no mediation has been elected,
            then any party to the dispute may file a legal action in any court
            of competent jurisdiction to resolve the dispute.

      IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed as of the _______ day of March, 1998.

SELLERS:                                                BUYER:

                                                JTM INDUSTRIES, INC.


- -----------------------------
Colin C. Jensen


- -----------------------------
Colin C. Jensen, Sr.


- -----------------------------
Irving F. Jensen, Jr.


- -----------------------------
Irving F. Jensen, III


- -----------------------------
Richard A. Everist


- -----------------------------
Richard Everist, Jr.


                                       31


- -----------------------------
Tom Everist


- -----------------------------
Erik M. Jensen


- -----------------------------
Mark R. Jensen


- -----------------------------
T. S. "Steve" Everist


                                       32