Document:

<PAGE>

                                EXHIBIT 10.15B

First
Security
Bank                              MODIFICATION AGREEMENT

<TABLE>
<CAPTION>
Principal   Loan Date  Maturity    Loan No. Call  Collateral  Account  Officer Initials
<S>                    <C>         <C>                        <C>      <C>
$4,000,000             04-10-2001   9001                      0032687   45917
</TABLE>
References in the shaded area are for Lender's use only and do not limit the
applicability of this document to any particular loan or item.

<TABLE>
<S>                                       <C>
Borrower: New Mexico Utilities, Inc.      Lender: First Security Bank of New Mexico, N.A.
          4700 Irving Blvd., Suite 201            Corporate Banking
          Albuquerque, NM  87114                  40 First Plaza Center NW
                                                  Albuquerque, NM  87102
</TABLE>

First Security Bank of New Mexico, N.A. ("Lender") has extended the credit (the
"Loan") to New Mexico Utilities, Inc. (individually and collectively "Borrower")
pursuant to a promissory note dated December 10, 1997 (the "Note") in the stated
principal amount of $4,000,000.00.  The Loan is unsecured.

The Note and any loan agreements, guaranties, subordinations, Collateral
Documents and other instruments and documents executed in connection therewith,
together with any previous modifications to any of these instruments or
documents shall be referred to as the "Loan Documents".

Borrower has requested certain modifications to the Loan Documents and Lender is
willing to grant such modifications on the following terms and conditions:

      1.  Provided that all conditions stated herein are satisfied, the terms of
          the Loan Documents are hereby modified as follows:

          Modifications to the Terms of the Note
          --------------------------------------
          The maturity date of the Note is extended to April 10, 2001,

          The interest rate under the Note is modified effective April 10, 2000.
          The interest rate on this Agreement is subject to change from time to
          time based on changes in an index which is the British Bankers
          Association quoted through Telerate System (the "Index").  The Index
          is that interest rate determined by Lender as the rate quoted by the
          British Bankers Association through the Dow Jones Telerate System
          Report (or such other similar source as may be selected by Lender) as
          the London Interbank Offered Rate (LIBOR) for deposits of United
          States dollars for one month maturity.  Lender will tell Borrower the
          current Index rate upon Borrower's request.  Borrower understands that
          Lender may make loans based on other rates as well.  The interest rate
          change will not occur more often than each day.  The Index currently
          is 6.132% per annum.  The interest rate to be applied to the unpaid
          principal balance of this agreement will be at 1.250 percentage points
          over the Index, resulting in an initial rate of 7.382% per annum.
          NOTICE: Under no circumstances will the interest rate on this
          Agreement be more than the maximum rate allowed by applicable law.

          This Agreement does not constitute a repayment or extinguishments of
          the Note, but only a modification thereof.

      2.  As preconditions to the terms of this Agreement, Borrower shall
          complete or provide the following

          Borrower shall pay or shall have paid all reasonable fees, costs, and
          expenses, of whatever kind or nature, incurred by Lender in connection
          with this Agreement, including but not limited to attorney's fees,
          lien search fees, title reports and pollicies, and recording and
          filing fees.
<PAGE>

      3.  It is the intention and agreement of Borrower and Lender that: (I) all
          collateral security in which Lender has acquired a security interest
          or other lien pursuant to the Loan Documents shall continue to serve
          as collateral security for payment and performance of all the
          obligations of the Borrower under the Loan Documents, and (iii) all
          agreements, representations, warranties and covenants contained in the
          Loan Documents are hereby reaffirmed in full by borrower except as
          specifically modified by this Agreement

      4.  Borrower hereby acknowledges that: (I) the Loan Documents are in full
          force and effect, as modified by this Agreement, and (ii) by entering
          into this Agreement, Lender does not waive any existing default or any
          default hereafter occurring or become obligated to waive any condition
          or obligation under the Loan Documents.

      5.  Borrower hereby acknowledges that Borrower has no claim, demand,
          lawsuit, cause of action, claim for relief, remedy, or defense against
          enforcement of the Loan Documents that could be asserted against
          Lender, its affiliates, directors, officers, employees, or
          representations, commitments, statements or warranties, including
          without limitation any such conduct arising out of or in any way
          connected with the Loan Documents. Notwithstanding the foregoing,
          Borrower hereby waives, releases and relinquishes any and all claims,
          demands, lawsuits, causes of action, claims for relief, remedies or
          defenses against enforcement of the Loan Documents that could be
          asserted against Lender, its affiliates, directors, officers,
          employees or agents, whether known or unknown.

      6.  In addition to this Agreement, the Loan Documents, and any additional
          documents that this Agreement requires, this finance transaction may
          include other written closing documentation such as resolutions,
          waivers, certificates, financing statements, filings, statements
          closing or escrow instructions, loan purpose statements, and other
          documents that Lender may customarily use in such transactions. Such
          documents are incorporated herein by this reference. All the documents
          to which this paragraph makes reference express, embody and supercede
          any previous understandings, agreements, or promises (whether oral or
          written) with respect to this finance transaction, and represent the
          final expression of the agreement between Lender and Borrower, the
          terms and conditions of which cannot hereafter by contradicted by any
          oral understanding (if any) not reduced to writing and identified
          above.

     WRITTEN AGREEMENTS.  Borrower acknowledges that Borrower is aware of the
     provisions of Section 58-6-5 NMSA 1978 Comp, which requires a contact,
     promise or commitment to loan money or to grant, extend, or renew credit or
     any modification thereof, in an amount greater that twenty-five thousand
     dollars ($25,000), not primarily for personal, family or household
     purposes, to be in wiring and signed by the party to be charged or that
     party's authorized representative.

     Effective as of April 10, 2000.

     LENDER:

     First Security Bank of New Mexico, N.A.

     By: /s/ J. CHESLEY STEEL
       ----------------------
       Authorized Officer

     BORROWERS:

     New Mexico Utilities, Inc.

     By: /s/ ROBERT L. SWARTWOUT           By:  /s/ WILLIAM C. JASURA
     ---------------------------           -----------------------------------
        Robert L. Swartwout, President          William C. Jasura, Secretary
<PAGE>

            AFFIRMATION OF GUARANTORS, GRANTORS, AND SUBORDINATORS

     Each of the following Guarantors, Grantors, Subordinators, and other
     parties to the Loan Documents hereby acknowledges and consents to the
     foregoing Modification Agreement and affirms and restates each of their
     respective liabilities, obligations, and agreements set forth in the Loan
     Documents.  In addition, the following specifically agree to continuing
     their respective guaranties and subordinations as to any increase in the
     principal amount of the Loan and specifically agree that the Collateral
     Documents secure any increase in the principal amount of the Loan.  Each of
     the following also hereby give the same assurances, representations,
     waivers, releases, and relinquishments given by Borrower in paragraph 5 of
     the Modification Agreement as if it were restated as part of this
     affirmation.

     GUARANTORS:

     Southwest Water Company

     By: /s/ PETER J. MOERBEEK
     -------------------------
        Peter J. Moerbeek, Vice President Finance/Chief Financial Officer

     By: /s/ STEPHEN J. MUZI
     -----------------------
        Stephen J. Muzi, Corporate Controller<PAGE>

                                                                   EXHIBIT 10.19

                            STOCK PURCHASE AGREEMENT

                                     among

                           SOUTHWEST WATER COMPANY,

                                   as Buyer,

                             MILTON R. DIGREGORIO,

                             BEVERLY A. DIGREGORIO

                                      and

                MILTON R. DIGREGORIO AND BEVERLY A. DIGREGORIO
                         2000 IRREVOCABLE FAMILY TRUST

                                  as Sellers

                                 April 3, 2000
<PAGE>

                                TABLE OF CONTENTS
                                -----------------

<TABLE>
<CAPTION>
<S>                                                                                      <C>
1.       Definitions.................................................................     1

2.       Purchase and Sale of Company Shares.........................................     4

         (a)      Basic Transaction..................................................     4
         (b)      Purchase Price.....................................................     4
         (c)      The Closing........................................................     4

3.       Representations and Warranties Concerning the Transaction...................     5

         (a)      Representations and Warranties of the Sellers......................     5
         (b)      Representations and Warranties of the Buyer........................     6

4.       Representations and Warranties Concerning the Company.......................     7

         (a)      Organization, Qualification, and Corporate Power...................     7
         (b)      Capitalization.....................................................     8
         (c)      Noncontravention...................................................     8
         (d)      Brokers' Fees......................................................     8
         (e)      Title to Assets....................................................     9
         (f)      Financial Statements...............................................     9
         (g)      Events Subsequent to Most Recent Fiscal Year End...................     9
         (h)      Undisclosed Liabilities............................................    11
         (i)      Legal Compliance...................................................    11
         (j)      Tax Matters........................................................    11
         (k)      Intellectual Property..............................................    13
         (l)      Tangible Assets....................................................    15
         (m)      Inventory..........................................................    15
         (n)      Contracts..........................................................    15
         (o)      Notes and Accounts Receivable......................................    17
         (p)      Powers of Attorney.................................................    17
         (q)      Insurance..........................................................    17
         (r)      Litigation.........................................................    17
         (s)      Product Warranty...................................................    18
         (t)      Product Liability..................................................    18
         (u)      Employees..........................................................    18
         (v)      Employee Benefits..................................................    19
         (w)      Guaranties.........................................................    20
         (x)      Certain Transactions...............................................    20
         (y)      Disclosure.........................................................    21

5.       Pre-Closing Covenants.......................................................    21

         (a)      General............................................................    21
         (b)      Notices and Consents...............................................    21
         (c)      Operation of Business..............................................    21
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                                                                                              <C>
         (d)      Preservation of Business....................................................    21
         (e)      Full Access.................................................................    22
         (f)      Notice of Developments......................................................    22
         (g)      Exclusivity.................................................................    22

6.       Post-Closing Covenants...............................................................    22

         (a)      General.....................................................................    22
         (b)      Transition..................................................................    22
         (c)      Confidentiality.............................................................    23
         (d)      Covenant Not to Compete.....................................................    23
         (e)      Continued Employment........................................................    23
         (f)      Sellers' Vehicles...........................................................    23

7.       Conditions to Obligation to Close....................................................    24

         (a)      Conditions to Obligation of the Buyer.......................................    24
         (b)      Conditions to Obligation of the Sellers.....................................    25

8.       Remedies for Breaches of This Agreement..............................................    26

         (a)      Survival of Representations, Warranties and Covenants.......................    26
         (b)      Indemnification Provisions for Benefit of the Buyer.........................    26
         (c)      Indemnification Provisions for Benefit of the Sellers.......................    26
         (d)      Indemnification Procedures..................................................    27
         (e)      Rights of Offset............................................................    29
         (f)      Other Indemnification Provisions............................................    30

9.       Tax Matters..........................................................................    30

         (a)      Section 338(h)(10) Election.................................................    30
         (b)      Tax Periods Ending on or Before the Closing Date............................    31
         (c)      Tax Periods Beginning Before and Ending After the Closing Date..............    31
         (d)      Cooperation on Tax Matters..................................................    31
         (e)      Certain Taxes...............................................................    32
         (f)      Changes in Accounting Methods...............................................    32

10.      Termination..........................................................................    32

         (a)      Termination of Agreement....................................................    32
         (b)      Effect of Termination.......................................................    33

11.      Miscellaneous........................................................................    33

         (a)      Press Releases and Public Announcements.....................................    33
         (b)      No Third-Party Beneficiaries................................................    33
         (c)      Entire Agreement............................................................    33
         (d)      Succession and Assignment...................................................    33
         (e)      Counterparts................................................................    34
         (f)      Headings....................................................................    34
         (g)      Notices.....................................................................    34
</TABLE>

                                       ii
<PAGE>

<TABLE>
<S>                                                                                        <C>
         (h)      Governing Law; Jurisdiction; Venue...................................    35
         (i)      Attorneys Fees.......................................................    35
         (j)      Amendments and Waivers...............................................    36
         (k)      Severability.........................................................    36
         (l)      Expenses.............................................................    36
         (m)      Construction.........................................................    36
         (n)      Incorporation of Exhibits and Schedules..............................    36
</TABLE>

Schedule 1 -- Purchase Price

Disclosure Schedule -- Exceptions to Representations and Warranties Concerning
                       the Company

                                      iii
<PAGE>

                           STOCK PURCHASE AGREEMENT

     THIS STOCK PURCHASE AGREEMENT ("Agreement") is made as of April 3, 2000, by
                                     ---------
and among SOUTHWEST WATER COMPANY, a Delaware corporation ("Buyer"), and MILTON
                                                            -----
R. DIGREGORIO, BEVERLY A. DIGREGORIO and the MILTON R. DIGREGORIO AND BEVERLY A.
DIGREGORIO 2000 IRREVOCABLE FAMILY TRUST (the "2000 Trust" and collectively the
                                               ----------
"Sellers"). Milton R. DiGregorio and Beverly A. DiGregorio are referred to
 -------
collectively herein as the "DiGregorios"), and the Buyer and the Sellers are
                            -----------
referred to collectively herein as the "Parties."
                                        -------

     The Sellers in the aggregate own all of the outstanding capital stock of
Master Tek International, Inc., a Colorado corporation ("Company").
                                                         -------

     This Agreement contemplates a transaction in which the Buyer will purchase
from the Sellers, and the Sellers will sell to the Buyer, eighty percent (80%)
of the outstanding capital stock of the Company in return for Two Million
Dollars ($2,000,000) cash and Two Million Dollars ($2,000,000) in the form of a
promissory note.

          Now, therefore, in consideration of the premises and the mutual
promises herein made, and in consideration of the representations, warranties,
and covenants herein contained, the Parties agree as follows.

     1. Definitions.
        -----------

          "Adverse Consequences" means all actions, suits, proceedings,
           --------------------
hearings, investigations, charges, complaints, claims, demands, injunctions,
judgments, orders, decrees, rulings, damages, dues, penalties, fines, costs,
amounts paid in settlement, Liabilities, obligations, Taxes, liens, losses,
expenses, and fees, including court costs and reasonable attorneys' fees and
expenses.

          "Affiliate" has the meaning set forth in Rule 12b-2 of the regulations
           ---------
promulgated under the Securities Exchange Act.

          "Affiliated Group" means any affiliated group within the meaning of
           ----------------
Code Section 1504(a).

          "Basis" means any past or present fact, situation, circumstance,
           -----
status, condition, activity, practice, plan, occurrence, event, incident,
action, failure to act, or transaction that forms or could form the basis for
any specified consequence.

          "Buyer" has the meaning set forth in the preface above.
           -----

          "Closing" has the meaning set forth in Section 2(c) below.
           -------

          "Closing Date" has the meaning set forth in Section 2(c) below.
           ------------

          "Code" means the Internal Revenue Code of 1986, as amended.
           ----
<PAGE>

          "Company" has the meaning set forth in the preface above.
           -------

          "Company Share" means any share of the Common Stock, no par value, of
           -------------

the Company.

          "Confidential Information" means any information concerning the
           ------------------------
businesses and affairs of the Company that is not already generally available to
the public.

          "Controlled Group of Corporations" has the meaning set forth in Code
           --------------------------------
Section 1563.

          "Disclosure Schedule" has the meaning set forth in Section 4 below.
           -------------------

          "Fiduciary" has the meaning set forth in ERISA ss.3(21).
           ---------
          "Financial Statement" has the meaning set forth in Section 4(f)
           -------------------
below.

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

          "Indemnified Party" has the meaning set forth in Section 8(d) below.
           -----------------

          "Indemnifying Party" has the meaning set forth in Section 8(d) below.
           ------------------

          "Intellectual Property" means (a) all inventions (whether patentable

or unpatentable and whether or not reduced to practice), all improvements
thereto, and all patents, patent applications, and patent disclosures, together
with all reissuances, continuations, continuations-in-part, revisions,
extensions, and reexaminations thereof, (b) all trademarks, service marks, trade
dress, logos, trade names, and corporate names, together with all translations,
adaptations, derivations, and combinations thereof and including all goodwill
associated therewith, and all applications, registrations, and renewals in
connection therewith, (c) all copyrightable works, all copyrights, and all
applications, registrations, and renewals in connection therewith, (d) all mask
works and all applications, registrations, and renewals in connection therewith,
(e) all trade secrets and confidential business information (including ideas,
research and development, know-how, formulas, compositions, manufacturing and
production processes and techniques, technical data, designs, drawings,
specifications, customer and supplier lists, pricing and cost information, and
business and marketing plans and proposals), (f) all computer software
(including data and related documentation), (g) all other proprietary rights,
and (h) all copies and tangible embodiments thereof (in whatever form or
medium).

          "Knowledge" or "know" means actual knowledge or where facts
           ---------      ----
are present that a person of reasonable prudence should know about the matter in
question.

          "Liability" means any liability (whether known or unknown,
           ---------
whether asserted or unasserted, whether absolute or contingent, whether accrued
or unaccrued, whether liquidated or unliquidated, and whether due or to become
due), including any liability for Taxes.

                                       2
<PAGE>

          "Most Recent Balance Sheet" means the balance sheet contained within
           -------------------------
the Most Recent Financial Statements.

          "Most Recent Financial Statements" has the meaning set forth in
           --------------------------------
Section 4(f) below.

          "Most Recent Fiscal Month End" has the meaning set forth in Section
4(f) below.

          "Most Recent Fiscal Year End" has the meaning set forth in Section
4(f) below.

          "Multiemployer Plan" has the meaning set forth in ERISA ss.3(37).
           ------------------

          "Ordinary Course of Business" means the ordinary course of business
           ---------------------------
consistent with past custom and practice (including with respect to quantity and
frequency).

          "Party" has the meaning set forth in the preface above.
           -----

          "PBGC" means the Pension Benefit Guaranty Corporation.
           ----

          "Person" means an individual, a partnership, a corporation, an
           ------
association, a joint stock company, a trust, a joint venture, an unincorporated
organization, or a governmental entity (or any department, agency, or political
subdivision thereof).

          "Prohibited Transaction" has the meaning set forth in ERISA ss.406
           ----------------------
and Code ss.4975.

          "Promissory Note" has the meaning set forth in Section 2(b) below.
           ---------------

          "Purchase Price" has the meaning set forth in Section 2(b) below.
           --------------

          "Reportable Event" has the meaning set forth in ERISA ss.4043.
           ----------------

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

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

          "Security Interest" means any mortgage, pledge, lien, encumbrance,
           -----------------
charge, or other security interest, other than (a) mechanic's, materialmen's,
and similar liens, (b) liens for Taxes not yet due and payable, (c) purchase
money liens and liens securing rental payments under capital lease arrangements,
and (d) other liens arising in the Ordinary Course of Business and not incurred
in connection with the borrowing of money.

          "Seller" has the meaning set forth in the preface above.
           ------

          "Sellers' Vehicles" has the meaning set forth in Section 2(e) below.
           -----------------

                                       3
<PAGE>

          "Subsidiary" means any corporation with respect to which a specified
           ----------
Person (or a Subsidiary thereof) owns a majority of the common stock or has the
power to vote or direct the voting of sufficient securities to elect a majority
of the directors.

          "Tax" means any federal, state, local, or foreign income, gross
           ---
receipts, license, payroll, employment, excise, severance, stamp, occupation,
premium, windfall profits, environmental (including taxes under Code ss.59A),
customs duties, capital stock, franchise, profits, withholding, social security
(or similar), unemployment, disability, real property, personal property, sales,
use, transfer, registration, value added, alternative or add-on minimum,
estimated, or other tax of any kind whatsoever, including any interest, penalty,
or addition thereto, whether disputed or not.

          "Tax Return" means any return, declaration, report, claim for refund,
           ----------
or information return or statement relating to Taxes, including any schedule or
attachment thereto, and including any amendment thereof.

          "Third Party Claim" has the meaning set forth in Section 8(d) below.
           -----------------

     2. Purchase and Sale of Company Shares.
        -----------------------------------

          (a) Basic Transaction. On and subject to the terms and conditions of
              -----------------
this Agreement, the Buyer agrees to purchase from each of the Sellers, and each
of the Sellers agrees to sell to the Buyer, an aggregate of twenty thousand
(20,000) Company Shares, which constitutes eighty percent (80%) of all of the
issued and outstanding Company Shares, and certain "Call Rights" as set forth in
that certain Master Tek Shareholder Agreement among the Company, SWC, the
DiGregorios and the 2000 Trust of even date herewith (the "Shareholders
                                                           ------------
Agreement"), for the Purchase Price specified in Section 2(b) and in accordance
---------
with Schedule 1 attached hereto.

          (b) Purchase Price. The Buyer agrees to pay to the Sellers at the
              --------------
Closing Four Million Dollars ($4,000,000) (the "Purchase Price") by delivery of
                                                --------------
(i)  a promissory note (the "Promissory Note") in the form of Exhibit A
                           ---------------                  ---------
attached hereto in the principal amount of Two Million Dollars ($2,000,000) and
(ii) cash for the balance of the Purchase Price payable by wire transfer or
delivery of other immediately available funds.

          (c) The Closing.  The closing of the transactions contemplated by this
              -----------
Agreement (the "Closing") shall take place at the offices of Buyer in West
Covina, California, on April 17, 2000 or such other date as the Buyer and the
Sellers may mutually determine (the "Closing Date"). At the Closing:
                                     ------------

                (i)  the Sellers will deliver to the Buyer the various
          certificates, instruments, and documents referred to in Section 7(a)
          below ;

               (ii)  the Buyer will deliver to the Sellers the various
          certificates, instruments, and documents referred to in Section 7(b)
          below;

                                       4
<PAGE>

               (iii)   each of the Sellers will deliver to the Buyer stock
          certificates representing all of his or her Company Shares, endorsed
          in blank or accompanied by duly executed assignment documents;

               (iv)    the Buyer will deliver to the Sellers the consideration
          specified in Section 2(b) above;

               (v)     title to the following vehicles (collectively, "Sellers'
                                                                       -------
          Vehicles") shall be transferred to the DiGregorios "as is, where is:"
          --------
          (1) a 1997 Mercedes Benz S500, (2) a 1999 Volvo S80; (3) a 2000 Toyota
          Tundra; and (4) a 1998 Toyota 4 Runner;

               (vi)    The entire amount has been paid to the DiGregorios to
          repay in full their loan to the Company (recorded as a note payable)
          within the seven (7) days prior to the Closing Date;

               (vii)   Sellers will ensure there is an amount of cash on the
          Closing Date equal to all of the outstanding checks written on all of
          the Company's bank accounts as of the Closing Date;

               (viii)  Sellers shall have funded all payroll and payroll-related
          costs and expenses, and all benefit costs and expenses for the middle
          of the month of April payroll cycle; and

               (ix)    Any cash remaining in the Company on the Closing Date
          that is not needed to repay the loan referred to in Section 2(c)(vi),
          to cover the outstanding checks under Section 2(c)(vii), and to fund
          the payroll and related costs under Section 2(c)(viii), less any
          required withholdings, shall be paid out to the DiGregorios as
          compensation.

     3. Representations and Warranties Concerning the Transaction.
        ---------------------------------------------------------

          (a) Representations and Warranties of the Sellers. The Sellers jointly
              ---------------------------------------------
and severally represent and warrant to the Buyer that the statements contained
in this Section 3(a) are correct and complete as of the date of this Agreement
and will be correct and complete as of the Closing Date (as though made then and
as though the Closing Date were substituted for the date of this Agreement
throughout this Section 3(a)) with respect to each of the Sellers.

               (i)     Authorization of Transaction. The Seller has full power
                       ----------------------------
          and authority to execute and deliver this Agreement and to perform
          their obligations hereunder. This Agreement constitutes the valid and
          legally binding obligation of the Seller, enforceable in accordance
          with its terms and conditions. The Seller need not give any notice to,
          make any filing with, or obtain any authorization, consent, or
          approval of any person, entity, government or governmental agency in
          order to consummate the transactions contemplated by this Agreement.

               (ii)    Noncontravention. Neither the execution and the delivery
                       ----------------
          of this Agreement, nor the consummation of the transactions
          contemplated hereby, will

                                       5
<PAGE>

          (A) violate any constitution, statute, regulation, rule, injunction,
          judgment, order, decree, ruling, charge, or other restriction of any
          government, governmental agency, or court to which the Seller is
          subject or (B) conflict with, result in a breach of, constitute a
          default under, result in the acceleration of, create in any party the
          right to accelerate, terminate, modify, or cancel, or require any
          notice under any agreement, contract, lease, license, instrument, or
          other arrangement to which the Seller is a party or by which he is
          bound or to which any of his assets is subject.

               (iii)   Brokers' Fees. The Seller has no Liability or obligation
                       -------------
          to pay any fees or commissions to any broker, finder, or agent with
          respect to the transactions contemplated by this Agreement.

               (iv)    Company Shares.  The Seller holds of record and owns
                       --------------
          beneficially only the number of Company Shares set forth next to his
          name in Section 4(b) of the Disclosure Schedule. These Company Shares
          are owned free and clear of any restrictions on transfer (other than
          any restrictions under the Securities Act and state securities laws),
          Taxes, Security Interests, options, warrants, purchase rights,
          contracts, commitments, equities, claims, and demands. The Seller is
          not a party to any option, warrant, purchase right, shareholder
          agreement or other contract or commitment that could require the
          Seller to sell, transfer, or otherwise dispose of any capital stock of
          the Company (other than this Agreement and the Master Tek Shareholder
          Agreement). The Seller is not a party to any voting trust, proxy,
          shareholder agreement or other agreement or understanding with respect
          to the voting of any capital stock of the Company.

               (v)     No Claims Against the Company. The Seller has no claims
                       -----------------------------
          or rights against the Company, and the Company is not obligated in any
          way to the Seller, except as are created through this Agreement or
          through one of the Agreements executed on even date herewith in
          conjunction with the transactions contemplated by this Agreement.

          (b) Representations and Warranties of the Buyer. The Buyer represents
              -------------------------------------------
and warrants to the Sellers that the statements contained in this Section 3(b)
are correct and complete as of the date of this Agreement and will be correct
and complete as of the Closing Date (as though made then and as though the
Closing Date were substituted for the date of this Agreement throughout this
Section 3(b)).

               (i)     Organization of the Buyer.  The Buyer is a corporation
                       -------------------------
          duly organized, validly existing, and in good standing under the laws
          of the jurisdiction of its incorporation.

               (ii)    Authorization of Transaction. The Buyer has full power
                       ----------------------------
          and authority (including full corporate power and authority) to
          execute and deliver this Agreement and to perform its obligations
          hereunder. This Agreement constitutes the valid and legally binding
          obligation of the Buyer, enforceable in accordance with its terms and
          conditions. The Buyer need not give any notice to,

                                       6
<PAGE>

          make any filing with, or obtain any authorization, consent, or
          approval of any person, entity, government or governmental agency in
          order to consummate the transactions contemplated by this Agreement.

               (iii)   Noncontravention. Neither the execution and the delivery
                       ----------------
          of this Agreement, nor the consummation of the transactions
          contemplated hereby, will (A) violate any constitution, statute,
          regulation, rule, injunction, judgment, order, decree, ruling, charge,
          or other restriction of any government, governmental agency, or court
          to which the Buyer is subject or any provision of its charter or
          bylaws or (B) conflict with or result in a breach of Buyer's Articles
          or Bylaws.

               (iv)    Brokers' Fees. The Buyer has no Liability or obligation
                       -------------
          to pay any fees or commissions to any broker, finder, or agent with
          respect to the transactions contemplated by this Agreement, except for
          a payment to be made to Dale Shaffer which shall be Buyer's sole
          obligation and responsibility to pay.

               (v)     Investment. The Buyer is not acquiring the Company Shares
                       ----------
          with a view to or for sale, resale, distribution or division in
          connection with any distribution thereof within the meaning of the
          Securities Act.

     4. Representations and Warranties Concerning the Company. The DiGregorios
jointly and severally represent and warrant to the Buyer that the statements
contained in this Section 4 are correct and complete as of the date of this
Agreement and will be correct and complete as of the Closing Date (as though
made then and as though the Closing Date were substituted for the date of this
Agreement throughout this Section 4), except as set forth in the disclosure
schedule delivered by the Sellers to the Buyer on the date hereof and attached
hereto (the "Disclosure Schedule"). Nothing in the Disclosure Schedule shall be
             -------------------
deemed adequate to disclose an exception to a representation or warranty made
herein, however, unless the Disclosure Schedule identifies the exception with
particularity and describes the relevant facts in detail. Without limiting the
generality of the foregoing, the mere listing (or inclusion of a copy) of a
document or other item shall not be deemed adequate to disclose an exception to
a representation or warranty made herein (unless the representation or warranty
has to do with the existence of the document or other item itself). The
Disclosure Schedule will be arranged in paragraphs corresponding to the lettered
and numbered paragraphs contained in this Section 4.

               (a)     Organization, Qualification, and Corporate Power. Section
                       ------------------------------------------------
4(a) of the Disclosure Schedule lists the state of incorporation for the
Company. The Company is a corporation duly organized, validly existing, and in
good standing under the laws of the Colorado. The Company is duly authorized to
conduct business and is in good standing under the laws of each jurisdiction
where such qualification is required. The Company has full corporate power and
authority and all licenses, permits, and authorizations necessary to carry on
the businesses in which it is engaged and in which it presently proposes to
engage and to own and use the properties owned and used by it. Section 4(a) of
the Disclosure Schedule lists the directors and officers of the Company.
Complete copies of the charter and bylaws of the Company (as amended to date)
are attached to the Disclosure Schedule. The minute books (containing the
records of meetings of the stockholders, the board of directors, and any
committees of the board of directors), the stock certificate books, and the
stock record books of

                                       7
<PAGE>

the Company, in the forms made available to the Buyer for review, are correct
and complete. The Company is not in default under or in violation of any
provision of its charter or bylaws.

          (b) Capitalization. The entire authorized capital stock of the Company
              --------------
consists of 50,000 Company Shares, of which 25,000 Company Shares are issued and
outstanding and no Company Shares are held in treasury. All of the issued and
outstanding Company Shares have been duly authorized, are validly issued, fully
paid, and nonassessable, and are held of record by the respective Sellers as set
forth in Section 4(b) of the Disclosure Schedule. There are no outstanding or
authorized options, warrants, purchase rights, subscription rights, conversion
rights, exchange rights, shareholder agreement or other contracts or commitments
that could require the Company to issue, sell, or otherwise cause to become
outstanding any of its capital stock. There are no outstanding or authorized
stock appreciation, phantom stock, profit participation, or similar rights with
respect to the Company. There are no voting trusts, proxies, or other agreements
or understandings with respect to the voting of the capital stock of the
Company.

          (c) Noncontravention. Neither the execution and the delivery of this
              ----------------
Agreement, nor the consummation of the transactions contemplated hereby, will
(i) violate any constitution, statute, regulation, rule, injunction, judgment,
order, decree, ruling, charge, or other restriction of any government,
governmental agency, or court to which the Company is subject or any provision
of the charter or bylaws of the Company or (ii) conflict with, result in a
breach of, constitute a default under, result in the acceleration of, create in
any party the right to accelerate, terminate, modify, or cancel, or require any
notice under any agreement, contract, lease, license, instrument, or other
arrangement to which the Company is a party or by which it is bound or to which
any of its assets is subject (or result in the imposition of any Security
Interest upon any of its assets). The Company does not need to give any notice
to, make any filing with, or obtain any authorization, consent, or approval of
any person, entity, government or governmental agency in order for the Parties
to consummate the transactions contemplated by this Agreement.

          (d) Brokers' Fees.  The Company does not have any Liability or
              -------------
obligation  to pay any fees or  commissions  to any broker,finder, or agent
with respect to the transactions contemplated by this Agreement.

          (e) Title to Assets. The Company has good and marketable title to, or
              ---------------
a valid leasehold interest in, the properties and assets used by them, located
on their premises, or shown on the Most Recent Balance Sheet or acquired after
the date thereof, free and clear of all Security Interests, except for
properties and assets disposed of in the Ordinary Course of Business since the
date of the Most Recent Balance Sheet.

          (f) Financial Statements. Attached to the Disclosure Schedule are the
              ---------------------
following financial statements (collectively the "Financial Statements"): (i)
                                                  --------------------
unaudited balance sheets and statements of income as of and for the fiscal years
ended September 30, 1998 and September 30, 1999 (the "Most Recent Fiscal Year
End") for the Company; and (ii) unaudited balance sheets and statements of
income (the "Most Recent Financial Statements") as of and for the four months
             --------------------------------
ended January 31, 2000 (the "Most Recent Fiscal Month End") for the Company. The
                             ----------------------------
Financial Statements have been prepared on a consistent basis throughout the
periods covered thereby, are correct and complete, and are consistent with the
books and records of the Company (which

                                       8
<PAGE>

books and records are correct and complete); provided, however, that the Most
Recent Financial Statements are subject to normal year-end adjustments (which
will not be material individually or in the aggregate under the method of
accounting that has been consistently applied by the Company). The Financial
Statements have not been prepared in accordance with GAAP and do not contain
footnotes.

               (g) Events Subsequent to Most Recent Fiscal Year End. Since the
                   ------------------------------------------------
Most Recent Fiscal Year End, and except as shown in the Most Recent Financial
Statements and Disclosure Schedule there has not been any material adverse
change in the business, financial condition, operations, results of operations,
or future prospects of the Company. Without limiting the generality of the
foregoing, since that date:

                    (i)    the Company has not sold, leased, transferred, or
          assigned any of its assets, tangible or intangible, other than for a
          fair consideration in the Ordinary Course of Business except pursuant
          to this Agreement;

                    (ii)   the Company has not entered into any agreement,
          contract, lease, or license (or series of related agreements,
          contracts, leases, and licenses) either involving more than One
          Hundred Thousand Dollars ($100,000) or outside the Ordinary Course of
          Business;

                    (iii)  no party (including the Company) has accelerated,
          terminated, modified, or cancelled any agreement, contract, lease, or
          license (or series of related agreements, contracts, leases, and
          licenses) involving more than Twenty Five Thousand Dollars ($25,000)
          to which the Company is a party or by which it is bound;

                    (iv)   the Company has not imposed any Security Interest
          upon any of its assets, tangible or intangible;

                    (v)    the Company has not made any capital expenditure (or
          series of related capital expenditures) either involving more than One
          Hundred Thousand Dollars ($100,000) or outside the Ordinary Course of
          Business;

                    (vi)   the Company has not made any capital investment in,
          any loan to, or any acquisition of the securities or assets of, any
          other Person (or series of related capital investments, loans, and
          acquisitions);

                    (vii)  the Company has not issued any note, bond, or other
          debt security or created, incurred, assumed, or guaranteed any
          indebtedness for borrowed money or capitalized lease obligation;

                    (viii) the Company has not delayed or postponed the payment
          of accounts payable and other Liabilities;

                    (ix)   the Company has not cancelled, compromised, waived,
          or released any right or claim (or series of related rights and
          claims) either involving more

                                       9
<PAGE>

          than Twenty Five Thousand Dollars ($25,000) or outside the Ordinary
          Course of Business;

               (x)     the Company has not granted any license or sublicense of
          any rights under or with respect to any Intellectual Property;

               (xi)    there has been no change made or authorized in the
          charter or bylaws of the Company;

               (xii)   the Company has not issued, sold, or otherwise disposed
          of any of its capital stock, or granted any options, warrants, or
          other rights to purchase or obtain (including upon conversion,
          exchange, or exercise) any of its capital stock;

               (xiii)  the Company has not declared, set aside, or paid any
          dividend or made any distribution with respect to its capital stock
          (whether in cash or in kind) or redeemed, purchased, or otherwise
          acquired any of its capital stock;

               (xiv)   the Company has not experienced any damage, destruction,
          or loss in excess of $10,000 (whether or not covered by insurance) to
          its property;

               (xv)    the Company has not made any loan to, or entered into any
          other transaction with, any of its directors, officers, and employees;

               (xvi)   the Company has not entered into any employment contract
          or collective bargaining agreement, written or oral, or modified the
          terms of any existing such contract or agreement;

               (xvii)  the Company has not granted any increase in the base
          compensation of any of its directors, officers, and employees;

               (xviii) the Company has not adopted, amended, modified, or
          terminated any bonus, profit-sharing, incentive, severance, or other
          plan, contract, or commitment for the benefit of any of its directors,
          officers, and employees (or taken any such action with respect to any
          other Employee Benefit Plan as defined in Section 4(v));

               (xix)   the Company has not made any other change in employment
          terms for any of its directors, officers, and employees;

               (xx)    the Company has not made or pledged to make any
          charitable or other capital contribution which individually or in the
          aggregate exceeds $5,000;

               (xxi)   there has not been any other material occurrence, event,
          incident, action, failure to act, or transaction outside the Ordinary
          Course of Business involving the Company, with the exception of the
          Company's distribution of the Sellers' Vehicles to the Sellers at or
          immediately prior to the Closing; and

               (xxii)  the Company has not committed to any of the foregoing.

                                       10
<PAGE>

          (h) Undisclosed Liabilities. The Company does not have any Liability
              -----------------------
(and there is no Basis for any present or future action, suit, proceeding,
hearing, investigation, charge, complaint, claim, or demand against any of them
giving rise to any Liability), except for (i) Liabilities set forth on the face
of the Most Recent Balance Sheet and (ii) Liabilities which have arisen after
the Most Recent Fiscal Month End in the Ordinary Course of Business (none of
which results from, arises out of, relates to, is in the nature of, or was
caused by any breach of contract, breach of warranty, tort, infringement, or
violation of law).

          (i) Legal Compliance. Each of the Company and its respective
              ----------------
predecessors and Affiliates has complied with all applicable laws (including
rules, regulations, codes, plans, injunctions, judgments, orders, decrees,
rulings, and charges thereunder) of federal, state, local, and foreign
governments (and all agencies thereof), and no action, suit, proceeding,
hearing, investigation, charge, complaint, claim, demand, or notice has been
filed or commenced against any of them alleging any failure so to comply.

          (j) Tax Matters.
              -----------

                 (i)   The Company has filed all Tax Returns that it was
          required to file. All such Tax Returns were correct and complete in
          all respects. All Taxes owed by the Company (whether or not shown on
          any Tax Return) have been paid. The Company currently is not the
          beneficiary of any extension of time within which to file any Tax
          Return. No claim has ever been made by an authority in a jurisdiction
          where the Company does not file Tax Returns that it is or may be
          subject to taxation by that jurisdiction. There are no Security
          Interests on any of the assets of the Company that arose in connection
          with any failure (or alleged failure) to pay any Tax.

                 (ii)  The Company has not failed to withhold, or withheld but
          failed to pay, any Taxes required to have been withheld and paid in
          connection with amounts paid or owing to any employee, independent
          contractor, creditor, stockholder, or other third party.

                 (iii) No Seller or director or officer (or employee responsible
          for Tax matters) of the Company expects any authority to assess any
          additional Taxes for any period for which Tax Returns have been filed.
          There is no dispute or claim concerning any Tax Liability of the
          Company either (A) claimed or raised by any authority in writing or
          (B) as to which any of the Sellers and the directors and officers (and
          employees responsible for Tax matters) of the Company have Knowledge
          based upon personal contact with any agent of such authority. Section
          4(j) of the Disclosure Schedule lists all federal, state, local, and
          foreign income Tax Returns filed with respect to the Company for
          taxable periods ended on or after December 31, 1998, indicates whether
          to the Seller's Knowledge those Tax Returns have been audited by a
          taxing authority, and indicates whether those Tax Returns are the
          subject of audit by a taxing authority. The Sellers have delivered to
          the Buyer correct and complete copies of all federal income Tax
          Returns, examination reports, and statements of deficiencies assessed
          against or agreed to by the Company since December 31, 1998.

                                       11
<PAGE>

          (iv)   The Company has not waived any statute of limitations in
     respect of Taxes or agreed to any extension of time with respect to a Tax
     assessment or deficiency.

          (v)    The Company has not filed a consent under Codess.341(f)
     concerning collapsible corporations. The Company has not made any payments,
     is obligated to make any payments, or is a party to any agreement that
     under certain circumstances could obligate it to make any payments that
     will not be deductible under Codess.280G. The Company has not been a United
     States real property holding corporation within the meaning of
     Codess.897(c)(2) during the applicable period specified in
     Codess.897(c)(1)(A)(ii). The Company has disclosed on its federal income
     Tax Returns all positions taken therein that could give rise to a
     substantial understatement of federal income Tax within the meaning of
     Codess.6662. The Company is not a party to any Tax allocation or sharing
     agreement. The Company (A) has not been a member of an Affiliated Group
     filing a consolidated federal income Tax Return (other than a group the
     common parent of which was the Company) or (B) does not have any Liability
     for the Taxes of any Person (other than the Company) under Reg.ss.1.1502-6
     (or any similar provision of state, local, or foreign law), as a transferee
     or successor, by contract, or otherwise.

          (vi)   Section 4(j) of the Disclosure Schedule sets forth the
     following information with respect to the Company as of the most recent
     practicable date the amount of any net operating loss, net capital loss,
     unused investment or other credit, unused foreign tax, or excess charitable
     contribution allocable to the Company.

          (vii)  Other than the accounts receivable which are recorded on the
     books of the Company under the accrual method, there is no material
     difference between the book basis and the tax basis of the Company in its
     assets.

     (k) Intellectual Property.
         ---------------------

          (i)    The Company owns or has the right to use pursuant to license,
     sublicense, agreement, or permission all Intellectual Property necessary
     for the operation of the businesses of the Company as presently conducted
     and as presently proposed to be conducted. Each item of Intellectual
     Property owned or used by the Company immediately prior to the Closing
     hereunder will be owned or available for use by the Company on identical
     terms and conditions immediately subsequent to the Closing hereunder. The
     Company has taken all necessary actions to maintain and protect each item
     of Intellectual Property that they own or use.

          (ii)   The Company has not interfered with, infringed upon,
     misappropriated, or otherwise come into conflict with any Intellectual
     Property rights of third parties, and none of the Sellers and the directors
     and officers (and employees with responsibility for Intellectual Property
     matters) of the Company

                                       12
<PAGE>

     has ever received any charge, complaint, claim, demand, or notice alleging
     any such interference, infringement, misappropriation, or violation
     (including any claim that the Company must license or refrain from using
     any Intellectual Property rights of any third party). To the Knowledge of
     any of the Sellers and the directors and officers (and employees with
     responsibility for Intellectual Property matters) of the Company, no third
     party has interfered with, infringed upon, misappropriated, or otherwise
     come into conflict with any Intellectual Property rights of any of the
     Company.

          (iii)  Section 4(k)(iii) of the Disclosure Schedule identifies each
     patent or registration which has been issued to the Company with respect to
     any of its Intellectual Property, identifies each pending patent
     application or application for registration which the Company has made with
     respect to any of its Intellectual Property, and identifies each license,
     agreement, or other permission which the Company has granted to any third
     party with respect to any of its Intellectual Property (together with any
     exceptions). The Sellers have delivered to the Buyer correct and complete
     copies of all such patents, registrations, applications, licenses,
     agreements, and permissions (as amended to date). Section 4(k)(iii) of the
     Disclosure Schedule also identifies each trade name or unregistered
     trademark used by the Company in connection with any of its businesses.
     With respect to each item of Intellectual Property required to be
     identified in Section 4(k)(iii) of the Disclosure Schedule:

                 (A) the Company possesses all right, title, and interest in and
          to the item, free and clear of any Security Interest, license, or
          other restriction;

                 (B) the item is not subject to any outstanding injunction,
          judgment, order, decree, ruling, or charge;

                 (C) no action, suit, proceeding, hearing, investigation,
          charge, complaint, claim, or demand is pending or, to the Knowledge of
          any of the Sellers and the directors and officers (and employees with
          responsibility for Intellectual Property matters) of the Company, is
          threatened which challenges the legality, validity, enforceability,
          use, or ownership of the item; and

                 (D) the Company has never agreed to indemnify any Person for or
          against any interference, infringement, misappropriation, or other
          conflict with respect to the item.

          (iv)   Section 4(k)(iv) of the Disclosure Schedule identifies each
     item of Intellectual Property that any third party owns and that the
     Company uses pursuant to license, sublicense, agreement, or permission. The
     Sellers have delivered to the Buyer correct and complete copies of all such
     licenses, sublicenses, agreements, and permissions (as amended to date).
     With respect to each item of Intellectual Property required to be
     identified in Section 4(k)(iv) of the Disclosure Schedule:

                                       13
<PAGE>

                 (A) the license, sublicense, agreement, or permission covering
          the item is legal, valid, binding, enforceable, and in full force and
          effect;

                 (B) the license, sublicense, agreement, or permission will
          continue to be legal, valid, binding, enforceable, and in full force
          and effect on identical terms following the consummation of the
          transactions contemplated hereby;

                 (C) no party to the license, sublicense, agreement, or
          permission is in breach or default, and no event has occurred which
          with notice or lapse of time would constitute a breach or default or
          permit termination, modification, or acceleration thereunder;

                 (D) no party to the license, sublicense, agreement, or
          permission has given notice of repudiation of any provision thereof;

                 (E) with respect to each sublicense, the representations and
          warranties set forth in subsections (A) through (D) above are true and
          correct with respect to the underlying license;

                 (F) the underlying item of Intellectual Property is not subject
          to any outstanding injunction, judgment, order, decree, ruling, or
          charge;

                 (G) no action, suit, proceeding, hearing, investigation,
          charge, complaint, claim, or demand is pending or, to the Knowledge of
          any of the Sellers and the directors and officers (and employees with
          responsibility for Intellectual Property matters) of the Company, is
          threatened which challenges the legality, validity, or enforceability
          of the underlying item of Intellectual Property; and

                 (H) the Company has not granted any sublicense or similar right
          with respect to the license, sublicense, agreement, or permission.

          (v)    To the Knowledge of any of the Sellers and the directors and
     officers (and employees with responsibility for Intellectual Property
     matters) of the Company, the Company will not interfere with, infringe
     upon, misappropriate, or otherwise come into conflict with, any
     Intellectual Property rights of third parties as a result of the continued
     operation of its businesses as presently conducted and as presently
     proposed to be conducted.

     (l) Tangible Assets. The Company owns or leases all buildings, machinery,
         ---------------
equipment, vehicles and other tangible assets necessary for the conduct of its
businesses as presently conducted and as presently proposed to be conducted.
Each such tangible asset is free from defects (patent and latent), has been
maintained in accordance with normal industry practice, is in good operating
condition and repair (subject to normal wear and tear), and is suitable for the
purposes for which it presently is used and presently is proposed to be used.

                                       14
<PAGE>

     (m) Inventory. The inventory of the Company consists of raw materials and
         ---------
supplies, manufactured and purchased parts, goods in process, and finished
goods, all of which is merchantable and fit for the purpose for which it was
procured or manufactured, and none of which is slow-moving, obsolete, damaged,
or defective, subject only to the reserve for inventory writedown set forth on
the face of the Most Recent Balance Sheet (rather than in any notes thereto) as
adjusted for the passage of time through the Closing Date in accordance with the
past custom and practice of the Company.

     (n) Contracts.  Section 4(n) of the Disclosure Schedule lists the following
         ---------
contracts and other agreements to which the Company is a party:

            (i)     any agreement (or group of related agreements) for the lease
          of personal property to or from any Person providing for lease
          payments in excess of Twenty Five Thousand Dollars ($25,000) per
          annum;

            (ii)    any agreement (or group of related agreements) for the
          purchase or sale of raw materials, commodities, supplies, products, or
          other personal property, or for the furnishing or receipt of services,
          which is not in the ordinary course of business;

            (iii)   any agreement concerning a partnership or joint venture;

            (iv)    any agreement (or group of related agreements) under which
          it has created, incurred, assumed, or guaranteed any indebtedness for
          borrowed money, or any capitalized lease obligation, in excess of
          Twenty Five Thousand Dollars ($25,000) or under which it has imposed a
          Security Interest on any of its assets, tangible or intangible;

            (v)     any agreement concerning confidentiality or noncompetition;

            (vi)    any agreement with any of the Sellers and their Affiliates
          (other than the Company);

            (vii)   any profit sharing, stock option, stock purchase, stock
          appreciation, deferred compensation, severance, or other material plan
          or arrangement for the benefit of its current or former directors,
          officers, and employees;

            (viii)  any collective bargaining agreement;

            (ix)    any agreement for the employment of any individual on a
          full-time, part-time, consulting, or other basis or providing
          severance benefits;

            (x)     any agreement under which it has advanced or loaned any
          amount to any of its directors, officers, and employees;

            (xi)    any agreement under which the consequences of a default or
          termination could have a material adverse effect on the business,
          financial

                                       15
<PAGE>

          condition, operations, results of operations, or future prospects of
          the Company; or

            (xii)   any other agreement (or group of related agreements) the
          performance of which involves consideration in excess of One Hundred
          Thousand Dollars ($100,000).

          The Sellers have delivered to the Buyer a correct and complete
copy of each written agreement listed in Section 4(n) of the Disclosure Schedule
(as amended to date) and a written summary setting forth the terms and
conditions of each oral agreement referred to in Section 4(n) of the Disclosure
Schedule. With respect to each such agreement: (A) the agreement is legal,
valid, binding, enforceable, and in full force and effect; (B) the agreement
will continue to be legal, valid, binding, enforceable, and in full force and
effect on identical terms following the consummation of the transactions
contemplated hereby; (C) no party is in breach or default, and no event has
occurred which with notice or lapse of time would constitute a breach or
default, or permit termination, modification, or acceleration, under the
agreement; and (D) no party has repudiated any provision of the agreement.

          (o) Notes and Accounts Receivable. All notes receivable and accounts
              -----------------------------
receivable of the Company are reflected properly on its books and records, are
valid receivables subject to no setoffs or counterclaims, are current and
collectible, and will be collected in accordance with their terms at their
recorded amounts, subject only to the historical rate for bad debts, which is
three percent (3%). The Company's accounts receivable register dated as of April
7, 2000, is attached to the Disclosure Schedule.

          (p) Powers of Attorney.  There are no outstanding powers of attorney
              ------------------
executed on behalf of the Company.

          (q) Insurance. Section 4(q) of the Disclosure Schedule sets forth the
              ---------
following information with respect to each insurance policy (including policies
providing property, casualty, liability, and workers' compensation coverage and
bond and surety arrangements) to which the Company has been a party, a named
insured, or otherwise the beneficiary of coverage at any time within the past
four (4) years:

                 (i)   the name, address, and telephone number of the agent;

                 (ii)  the name of the insurer, the name of the policyholder,
          and the name of each covered insured; and

                 (iii) the policy number and the period of coverage.

          With respect to each such insurance policy: (A) the policy is legal,
valid, binding, enforceable, and in full force and effect; (B) the policy will
continue to be legal, valid, binding, enforceable, and in full force and effect
on identical terms following the consummation of the transactions contemplated
hereby; (C) neither the Company nor any other party to the policy is in breach
or default (including with respect to the payment of premiums or the giving of
notices), and no event has occurred which, with notice or the lapse of time,
would constitute such a breach or default, or permit termination, modification,
or acceleration, under the policy; and (D) no

                                       16
<PAGE>

party to the policy has repudiated any provision thereof. The Company has been
covered during the past four (4) years by insurance in scope and amount
customary and reasonable for the businesses in which it has engaged during the
aforementioned period. Section 4(q) of the Disclosure Schedule describes any
self-insurance arrangements affecting the Company.

          (r)  Litigation. Section 4(r) of the Disclosure Schedule sets forth
               ----------
each instance in which the Company (i) is subject to any outstanding injunction,
judgment, order, decree, ruling, or charge or (ii) is a party or, to the
Knowledge of any of the Sellers and the directors and officers (and employees
with responsibility for litigation matters) of the Company, is threatened to be
made a party to any action, suit, proceeding, hearing, or investigation of, in,
or before any court or quasi-judicial or administrative agency of any federal,
state, local, or foreign jurisdiction or before any arbitrator. None of the
actions, suits, proceedings, hearings, and investigations set forth in Section
4(r) of the Disclosure Schedule could result in any material adverse change in
the business, financial condition, operations, results of operations, or future
prospects of the Company. None of the Sellers and the directors and officers
(and employees with responsibility for litigation matters) of the Company has
any reason to believe that any such action, suit, proceeding, hearing, or
investigation may be brought or threatened against the Company.

          (s)  Product Warranty. Each product manufactured, sold, leased, or
               ----------------
delivered by the Company has been in conformity with all applicable contractual
commitments and all express and implied warranties, and the Company does not
have any Liability (and, to Sellers' Knowledge, there is no Basis for any
present or future action, suit, proceeding, hearing, investigation, charge,
complaint, claim, or demand against any of them giving rise to any Liability)
for replacement or repair thereof or other damages in connection therewith,
subject only to the reserve for product warranty claims set forth on the face of
the Most Recent Balance Sheet as adjusted for the passage of time through the
Closing Date in accordance with the past custom and practice of the Company. No
product manufactured, sold, leased, or delivered by the Company is subject to
any guaranty, warranty, or other indemnity beyond the applicable standard terms
and conditions of sale or lease. Section 4(s) of the Disclosure Schedule
includes copies of the standard terms and conditions of sale or lease for the
Company (containing applicable guaranty, warranty, and indemnity provisions).

          (t)  Product Liability. The Company does not have any Liability (and
               -----------------
there is no Basis for any present or future action, suit, proceeding, hearing,
investigation, charge, complaint, claim, or demand against any of them giving
rise to any Liability) arising out of any injury to individuals or property as a
result of the ownership, possession, or use of any product manufactured, sold,
leased, or delivered by the Company.

          (u)  Employees. To the Knowledge of any of the Sellers and the
               ---------
directors and officers (and employees with responsibility for employment
matters) of the Company, no executive, key employee, or group of employees (with
the exception of Beverly DiGregorio) has any plans to terminate employment with
the Company. The Company is not a party to or bound by any collective bargaining
agreement, nor has it experienced any strikes, grievances, claims of unfair
labor practices, or other collective bargaining disputes. The Company has not
committed any unfair labor practice. None of the Sellers and the directors and
officers (and employees with responsibility for employment matters) of the
Company has any Knowledge of any

                                       17
<PAGE>

organizational effort presently being made or threatened by or on behalf of any
labor union with respect to employees of the Company.

          (v)  Employee Benefits.
               -----------------

                    (i)  Section 4(v) of the Disclosure Schedule lists each
          employee benefit plan ("Employee Benefit Plan") that the Company
          maintains or to which the Company contributes.

                         (A)  Each such Employee Benefit Plan (and each related
                    trust, insurance contract, or fund) complies in form and in
                    operation in all respects with the applicable requirements
                    of ERISA, the Code, and other applicable laws.

                         (B)  All required reports and descriptions (including
                    Form 5500 Annual Reports, Summary Annual Reports, PBGC-1's,
                    and Summary Plan Descriptions) have been filed or
                    distributed appropriately with respect to each such Employee
                    Benefit Plan. The requirements of Part 6 of Subtitle B of
                    Title I of ERISA and of Code ss.4980B have been met with
                    respect to each such Employee Benefit Plan which is an
                    Employee Welfare Benefit Plan.

                         (C)  All contributions (including all employer
                    contributions and employee salary reduction contributions)
                    which are due have been paid to each such Employee Benefit
                    Plan which is an Employee Pension Benefit Plan and all
                    contributions for any period ending on or before the Closing
                    Date which are not yet due have been paid to each such
                    Employee Pension Benefit Plan or accrued in accordance with
                    the past custom and practice of the Company. All premiums or
                    other payments for all periods ending on or before the
                    Closing Date have been paid with respect to each such
                    Employee Benefit Plan which is an Employee Welfare Benefit
                    Plan.

                         (D)  Each such Employee Benefit Plan which is an
                    Employee Pension Benefit Plan meets the requirements of a
                    "qualified plan" under Code ss.401(a) and has received,
                    within the last two years, a favorable determination letter
                    from the Internal Revenue Service.

                         (E)  The Sellers have delivered to the Buyer correct
                    and complete copies of the plan documents and summary plan
                    descriptions, the most recent determination letter received
                    from the Internal Revenue Service, the most recent Form 5500
                    Annual Report, and all related trust agreements, insurance
                    contracts, and other funding agreements which implement each
                    such Employee Benefit Plan.

                    (ii) With respect to each Employee Benefit Plan that the
          Company and the Controlled Group of Corporations which includes the
          Company maintains or ever has maintained or to which it contributes,
          ever has contributed, or ever has been required to contribute:

                                       18
<PAGE>

                         (A)  No such Employee Benefit Plan which is an Employee
                    Pension Benefit Plan (other than any Multiemployer Plan) has
                    been completely or partially terminated or been the subject
                    of a Reportable Event as to which notices would be required
                    to be filed with the PBGC. No proceeding by the PBGC to
                    terminate any such Employee Pension Benefit Plan (other than
                    any Multiemployer Plan) has been instituted or threatened.

                         (B)  There have been no Prohibited Transactions with
                    respect to any such Employee Benefit Plan. No Fiduciary has
                    any Liability for breach of fiduciary duty or any other
                    failure to act or comply in connection with the
                    administration or investment of the assets of any such
                    Employee Benefit Plan. No action, suit, proceeding, hearing,
                    or investigation with respect to the administration or the
                    investment of the assets of any such Employee Benefit Plan
                    (other than routine claims for benefits) is pending or
                    threatened. None of the Sellers and the directors and
                    officers (and employees with responsibility for employee
                    benefits matters) of the Company has any Knowledge of any
                    Basis for any such action, suit, proceeding, hearing, or
                    investigation.

                         (C)  The Company has not incurred, and none of the
                    Sellers and the directors and officers (and employees with
                    responsibility for employee benefits matters) of the Company
                    has any reason to expect that the Company will incur, any
                    Liability to the PBGC (other than PBGC premium payments) or
                    otherwise under Title IV of ERISA (including any withdrawal
                    Liability) or under the Code with respect to any such
                    Employee Benefit Plan which is an Employee Pension Benefit
                    Plan.

                    (iii)  None of the Company and the other members of the
     Controlled Group of Corporations that includes the Company contribute to,
     ever has contributed to, or ever has been required to contribute to any
     Multiemployer Plan or has any Liability (including withdrawal Liability)
     under any Multiemployer Plan.

                    (iv)   The Company does not maintain nor has it ever
     maintained or contributed, or ever has been required to contribute to any
     Employee Welfare Benefit Plan providing medical, health, or life insurance
     or other welfare-type benefits for current or future retired or terminated
     employees, their spouses, or their dependents (other than in accordance
     with Code ss.4980B).

          (w)  Guaranties. The Company is not a guarantor nor is it otherwise
               ----------
liable for any Liability or obligation (including indebtedness) of any other
Person.

          (x)  Certain Transactions. Except as set forth in Section 4(x) of the
               --------------------
Disclosure Schedule, there is no agreement or transaction, and no agreement or
transaction has been proposed, to which the Company was or is to be a party and
in which any director or officer of the Company or any person owning of record
or beneficially more than 10% of the outstanding

                                       19
<PAGE>

capital stock of the Company or any Affiliate of any such Person had or has a
direct or indirect material interest.

          (y)  Disclosure. The representations and warranties contained in
               ----------
this Section 4 do not contain any untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements and
information contained in this Section 4 not misleading.

     5.   Pre-Closing Covenants.  The Parties agree as follows with respect to
          ---------------------
the period between the execution of this Agreement and the Closing.

          (a)  General. Each of the Parties will use his or its reasonable
               -------
efforts to take all action and to do all things necessary in order to consummate
and make effective the transactions contemplated by this Agreement (including
satisfaction, but not waiver, of the closing conditions set forth in Section 7
below).

          (b)  Notices and Consents. The Sellers will cause the Company to
               --------------------
give any notices to third parties, and will cause the Company to use its
reasonable efforts to obtain any third party consents, that the Buyer may
reasonably request in connection with the matters referred to in Section 4(c)
above. Each of the Parties will (and the Sellers will cause the Company to) give
any notices to, make any filings with, and use its reasonable efforts to obtain
any authorizations, consents, and approvals of governments and governmental
agencies in connection with the matters referred to in Section 3(a)(i), Section
3(b)(ii), and Section 4(c) above.

          (c)  Operation of Business. The Sellers will not cause or permit the
               ---------------------
Company to engage in any practice, take any action, or enter into any
transaction outside the Ordinary Course of Business, with the exception of
causing the Company to distribute Sellers' Vehicles to the shareholders. Without
limiting the generality of the foregoing, the Sellers will not cause or permit
the Company to (i) declare, set aside, or pay any dividend or make any
distribution with respect to its capital stock or redeem, purchase, or otherwise
acquire any of its capital stock, or (ii) otherwise engage in any practice, take
any action, or enter into any transaction of the sort described in Section 4(g)
above.

         (d)   Preservation of Business. The Sellers will cause the Company to
               ------------------------
keep its business and properties substantially intact, including its present
operations, physical facilities, working conditions, and relationships with
lessors, licensors, suppliers, customers, and employees.

          (e)  Full Access. Each of the Sellers will permit, and the Sellers
               -----------
will cause the Company to permit, representatives of the Buyer to have full
access at all reasonable times, and in a manner so as not to interfere with the
normal business operations of the Company, to all premises, properties,
personnel, books, records (including Tax records), contracts, and documents of
or pertaining to the Company.

          (f)  Notice of Developments. The Sellers will give prompt written
               ----------------------
notice to the Buyer of any material adverse development causing a breach of any
of the representations and warranties in Section 4 above. Each Party will give
prompt written notice to the others of any

                                       20
<PAGE>

material adverse development causing a breach of any of his or its own
representations and warranties in Section 3 above.

          (g)  Exclusivity. None of the Sellers will (and the Sellers will not
               -----------
cause or permit the Company to) (i) solicit, initiate, or encourage the
submission of any proposal or offer from any Person relating to the acquisition
of any capital stock or other voting securities, or any substantial portion of
the assets of, the Company (including any acquisition structured as a merger,
consolidation, or share exchange) or (ii) participate in any discussions or
negotiations regarding, furnish any information with respect to, assist or
participate in, or facilitate in any other manner any effort or attempt by any
Person to do or seek any of the foregoing. None of the Sellers will vote their
Company Shares in favor of any such acquisition structured as a merger,
consolidation, or share exchange. The Sellers will notify the Buyer immediately
if any Person makes any proposal, offer, inquiry, or contact with respect to any
of the foregoing.

     6.   Post-Closing Covenants.  The Parties agree as follows with respect to
          ----------------------
the period following the Closing.

          (a)  General. In case at any time after the Closing any further action
               -------
is necessary to carry out the purposes of this Agreement, each of the Parties
will take such further action (including the execution and delivery of such
further instruments and documents) as any other Party reasonably may request,
all at the sole cost and expense of the requesting Party (unless the requesting
Party is entitled to indemnification therefor under Section 8 below). The
Sellers acknowledge and agree that from and after the Closing the Buyer will be
entitled to possession of all documents, books, records (including Tax records),
agreements, and financial data of any sort relating to the Company.

          (b)  Transition. None of the Sellers will take any action that is
               ----------
designed or intended to have the effect of discouraging any lessor, licensor,
customer, supplier, or other business associate of the Company from maintaining
the same business relationships with the Company after the Closing as it
maintained with the Company prior to the Closing. Each of the Sellers will refer
all customer inquiries relating to the businesses of the Company to the Buyer
from and after the Closing. Should Milton DiGregorio voluntarily terminate his
employment with the Company, the event of his termination shall not by itself be
deemed to be a breach of this Section 6(b).

          (c)  Confidentiality. Each of the Sellers will treat and hold as such
               ---------------
all of the Confidential Information, refrain from using any of the Confidential
Information except in connection with this Agreement, and deliver promptly to
the Buyer or destroy, at the request and option of the Buyer, all tangible
embodiments (and all copies) of the Confidential Information which are in his or
its possession. In the event that any of the Sellers is requested or required
(by oral question or request for information or documents in any legal
proceeding, interrogatory, subpoena, civil investigative demand, or similar
process) to disclose any Confidential Information, that Seller will notify the
Buyer promptly of the request or requirement so that the Buyer may seek an
appropriate protective order or waive compliance with the provisions of this
Section 6(c). If, in the absence of a protective order or the receipt of a
waiver hereunder, any of the Sellers is, on the advice of counsel, compelled to
disclose any Confidential Information to any tribunal or else stand liable for
contempt, that Seller may disclose the Confidential

                                       21
<PAGE>

Information to the tribunal; provided, however, that the disclosing Seller shall
use his or its reasonable efforts to obtain, at the request of the Buyer, an
order or other assurance that confidential treatment will be accorded to such
portion of the Confidential Information required to be disclosed as the Buyer
shall designate. The foregoing provisions shall not apply to any Confidential
Information which is generally available to the public immediately prior to the
time of disclosure.

          (d)  Covenant Not to Compete. As set forth in and subject to the
               -----------------------
provisions of that certain Non-Competition Agreement, the DiGregorios shall not,
for a period of ten (10) years from and after the Closing Date, engage directly
or indirectly in any business that the Company conducts as of the termination of
Employee's employment pursuant to the Employment Agreement. The Parties
acknowledge that the Non-Competition Agreement is a material inducement to the
purchase and sale of the Company Shares pursuant to this Agreement.

          (e)  Continued Employment. Buyer shall not, for a period of up to six
               --------------------
(6) months following the Closing Date, terminate any employee of the Company
without cause (other than Milton DiGregorio under the terms of his Employment
Agreement executed in conjunction herewith) without the approval of Milton
DiGregorio, which approval shall not be unreasonably withheld. (f) Sellers'
Vehicles. The DiGregorios accept the Sellers' Vehicles "as is, where is." The
DiGregorios shall pay all taxes, transfer fees, title fees, license fees and the
like with respect to the transfer of title to and ownership of the Sellers'
Vehicles.

     7.   Conditions to Obligation to Close.
          ---------------------------------

          (a)  Conditions to Obligation of the Buyer.  The obligation of the
               -------------------------------------
Buyer to consummate the transactions to be performed by it in connection with
the Closing is subject to satisfaction of the following conditions:

                    (i)  the representations and warranties set forth in Section
          3(a) and Section 4 above shall be true and correct in all material
          respects at and as of the Closing Date;

                    (ii)  the Sellers shall have performed and complied with all
          of their covenants hereunder in all material respects through the
          Closing;

                    (iii) the Company shall have procured all of the third party
          consents specified in Section 5(b) above;

                    (iv)  no action, suit, or proceeding shall be pending before
          any court or quasi-judicial or administrative agency of any federal,
          state, local, or foreign jurisdiction or before any arbitrator wherein
          an unfavorable injunction, judgment, order, decree, ruling, or charge
          would (A) prevent consummation of any of the transactions contemplated
          by this Agreement, (B) cause any of the transactions contemplated by
          this Agreement to be rescinded following consummation, (C) affect
          adversely the right of the Buyer to own the Company Shares and to
          control the Company, or (D) affect adversely the right of the Company
          to own its

                                       22
<PAGE>

          assets and to operate its businesses (and no such injunction,
          judgment, order, decree, ruling, or charge shall be in effect);

                    (v)    the Sellers shall have delivered to the Buyer a
          certificate to the effect that each of the conditions specified above
          in Section 7(a)(i)-(iv) is satisfied in all respects;

                    (vi)   the Buyer and the Sellers shall have entered into
          that certain Continuing Guaranty;

                    (vii)  the Buyer and the Sellers shall have entered into
          that certain Collateral Agreement;

                    (viii) the Buyer, the Sellers and Norwest Bank Colorado,
          N.A. shall have entered into that certain Stock Escrow Agreement;

                    (ix)   the Buyer, the Company and the Sellers shall have
          entered into that certain Master Tek Shareholder Agreement;

                    (x)    the Buyer, the Company and Milton DiGregorio shall
          have entered into that certain Employment Agreement;

                    (xi)   the Buyer, the Company and the DiGregorios shall have
          entered into that certain Noncompetition Agreement

                    (xii)  the Sellers shall have executed releases of all
          claims, rights and obligations with respect to the Company, other than
          claims, rights and obligations arising under documents executed as of
          the Closing Date;

                    (xiii) the Buyer shall have received the resignations,
          effective as of the Closing, of each director and officer of the
          Company;

                    (xiv)  the Board of Directors of the Buyer shall have
          approved this Agreement and the other documents referred to herein;

                    (xv)   the Buyer shall have obtained on terms and conditions
          reasonably satisfactory to it all of the financing it needs in order
          to consummate the transactions contemplated hereby;

                    (xvi)  the Buyer and the Sellers shall have executed cross-
          receipts for the number of Company Shares sold by, and the amount of
          Purchase Price paid to, each Seller; and

                    (xvii) all actions to be taken by the Sellers in connection
          with consummation of the transactions contemplated hereby and all
          certificates, opinions, instruments, and other documents required to
          effect the transactions contemplated hereby will be reasonably
          satisfactory in form and substance to the Buyer.

                                       23
<PAGE>

The Buyer may waive any condition specified in this Section 7(a) if it executes
a writing so stating at or prior to the Closing.

          (b)  Conditions to Obligation of the Sellers. The obligation of the
               ---------------------------------------
Sellers to consummate the transactions to be performed by them in connection
with the Closing is subject to satisfaction of the following conditions:

                    (i)    the representations and warranties set forth in
          Section 3(b) above shall be true and correct in all material respects
          at and as of the Closing Date;

                    (ii)   the Buyer shall have performed and complied with all
          of its covenants hereunder in all material respects through the
          Closing;

                    (iii)  no action, suit, or proceeding shall be pending
          before any court or quasi-judicial or administrative agency of any
          federal, state, local, or foreign jurisdiction or before any
          arbitrator wherein an unfavorable injunction, judgment, order, decree,
          ruling, or charge would (A) prevent consummation of any of the
          transactions contemplated by this Agreement or (B) cause any of the
          transactions contemplated by this Agreement to be rescinded following
          consummation (and no such injunction, judgment, order, decree, ruling,
          or charge shall be in effect);

                    (iv)   the Buyer shall have delivered to the Sellers a
          certificate to the effect that each of the conditions specified above
          in Section 7(b)(i)-(iii) is satisfied in all respects;

                    (v)    the relevant parties shall have entered into the
          agreements referred to in 7(a)(vi)-(xi);

                    (vi)   the Buyer shall have executed the Promissory Note and
          delivered the Purchase Price to the Sellers;

                    (vii)  the Buyer and the Sellers shall have executed cross-
          receipts for the number of Company Shares sold by, and the amount of
          Purchase Price paid to, each Seller; and

                    (viii) all actions to be taken by the Buyer in connection
          with consummation of the transactions contemplated hereby and all
          certificates, opinions, instruments, and other documents required to
          effect the transactions contemplated hereby will be reasonably
          satisfactory in form and substance to the Sellers.

The Sellers may waive any condition specified in this Section 7(b) if they
execute a writing so stating at or prior to the Closing.

                                       24
<PAGE>

     8.   Remedies for Breaches of This Agreement.
          ---------------------------------------

          (a)  Survival of Representations, Warranties and Covenants. All of
               -----------------------------------------------------
the representations and warranties of the Parties shall survive the Closing
hereunder and continue in full force and effect for a period equal to the
applicable statute of limitations on any actions with respect to such matters.

          (b)  Indemnification Provisions for Benefit of the Buyer. In the event
               ---------------------------------------------------
any of the Sellers breaches (or in the event any third party alleges facts that,
if true, would mean any of the Sellers has breached) any of their
representations, warranties or covenants contained herein, provided that the
Buyer makes a written claim for indemnification against any of the Sellers
pursuant to Section 8(d) below within the applicable survival period set forth
in Section 8(a), then each of the Sellers agrees jointly and severally to
indemnify the Buyer from and against the entirety of any Adverse Consequences
the Buyer may suffer through and after the date of the claim for indemnification
(including any Adverse Consequences the Buyer may suffer after the end of any
applicable survival period) resulting from, arising out of, relating to, in the
nature of, or caused by the breach (or the alleged breach).

          (c)  Indemnification Provisions for Benefit of the Sellers. In the
               -----------------------------------------------------
event the Buyer breaches (or in the event any third party alleges facts that, if
true, would mean the Buyer has breached) any of its representations, warranties,
and covenants contained herein, provided that any of the Sellers makes a written
claim for indemnification against the Buyer pursuant to Section 8(d) below
within the applicable survival period set forth in Section 8(a), then the Buyer
agrees to indemnify each of the Sellers from and against the entirety of any
Adverse Consequences the Seller may suffer through and after the date of the
claim for indemnification (including any Adverse Consequences the Seller may
suffer after the end of any applicable survival period) resulting from, arising
out of, relating to, in the nature of, or caused by the breach (or the alleged
breach).

          (d)  Indemnification Procedures.
               --------------------------

               (i)  If any third party shall notify any Party (the "Indemnified
                                                                    -----------
          Party") with respect to any matter (a "Third Party Claim") which may
          -----                                  -----------------
          give rise to a claim for indemnification against any other Party (the
          "Indemnifying Party") under this Section 8, then the Indemnified Party
           ------------------
          shall promptly notify each Indemnifying Party thereof in writing;
          provided, however, that no delay on the part of the Indemnified Party
          --------  -------
          in notifying any Indemnifying Party shall relieve the Indemnifying
          Party from any obligation hereunder unless (and then solely to the
          extent) the Indemnifying Party thereby is prejudiced.

               (ii) Any Indemnifying Party will have the right to defend the
          Indemnified Party against the Third Party Claim with counsel of its
          choice reasonably satisfactory to the Indemnified Party so long as (A)
          the Indemnifying Party notifies the Indemnified Party in writing
          within fourteen (14) days after the Indemnified Party has given notice
          of the Third Party Claim that the Indemnifying Party will indemnify
          the Indemnified Party from and against the entirety of any Adverse
          Consequences the Indemnified Party may suffer resulting from, arising

                                       25
<PAGE>

          out of, relating to, in the nature of, or caused by the Third Party
          Claim, (B) the Indemnifying Party provides the Indemnified Party with
          evidence reasonably acceptable to the Indemnified Party that the
          Indemnifying Party will have the financial resources to defend against
          the Third Party Claim and fulfill its indemnification obligations
          hereunder, (C) the Third Party Claim involves only money damages and
          does not seek an injunction or other equitable relief, (D) settlement
          of, or an adverse judgment with respect to, the Third Party Claim is
          not, in the good faith judgment of the Indemnified Party, likely to
          establish a precedential custom or practice materially adverse to the
          continuing business interests of the Indemnified Party, and (E) the
          Indemnifying Party conducts the defense of the Third Party Claim
          actively and diligently.

               (iii)  So long as the Indemnifying Party is conducting the
          defense of the Third Party Claim in accordance with Section 8(d)(ii)
          above, (A) the Indemnified Party may retain separate co-counsel at its
          sole cost and expense and participate in the defense of the Third
          Party Claim, (B) the Indemnified Party will not consent to the entry
          of any judgment or enter into any settlement with respect to the Third
          Party Claim without the prior written consent of the Indemnifying
          Party (not to be withheld unreasonably), and (C) the Indemnifying
          Party will not consent to the entry of any judgment or enter into any
          settlement with respect to the Third Party Claim without the prior
          written consent of the Indemnified Party (not to be withheld
          unreasonably).

               (iv)   In the event any of the conditions in Section 8(d)(ii)
          above is or becomes unsatisfied, however, (A) the Indemnified Party
          may defend against, and consent to the entry of any judgment or enter
          into any settlement with respect to, the Third Party Claim in any
          manner it reasonably may deem appropriate (and the Indemnified Party
          need not consult with, or obtain any consent from, any Indemnifying
          Party in connection therewith), (B) the Indemnifying Parties will
          reimburse the Indemnified Party promptly and periodically for the
          costs of defending against the Third Party Claim (including reasonable
          attorneys' fees and expenses), and (C) the Indemnifying Parties will
          remain responsible for any Adverse Consequences the Indemnified Party
          may suffer resulting from, arising out of, relating to, in the nature
          of, or caused by the Third Party Claim to the fullest extent provided
          in this Section 8.

               (v)    In the event that the claim for indemnification does not
          involve a claim by a third party, but instead is a claim by Buyer
          against Seller or Seller against Buyer, the Indemnified Party shall
          give the Indemnifying Parties notice of the alleged breach. The
          Indemnifying Parties shall have thirty (30) days to cure such breach,
          if the breach is of the type that can be cured. If the breach cannot
          be cured, or has not been cured after the expiration of the cure
          period, then the Indemnifying Parties shall promptly pay the
          Indemnified Party the amount of the claim to the fullest extent
          provided in this Section 8.

                                       26
<PAGE>

               (vi)  Notwithstanding anything to the contrary in this Agreement,
          the Buyer shall not have any right to receive any indemnification
          payment from the Sellers for any claims until:

                     (A)  The Sellers have exhausted all coverage available from
               insurance carried by Buyer or the Company with respect to such
               claims; and

                     (B)  The Buyer has accrued an aggregate of $25,000 of
               claims in excess of the claims covered by insurance.

               (vii) Notwithstanding anything to the contrary in this Agreement:

                     (A)  The Buyer shall not have any right to receive any
               indemnification payment from the Sellers in an amount in excess
               of the aggregate of the (x) principal amount then outstanding
               under the Promissory Note, (y) the then remaining payments under
               the Noncompetition Agreement and (z) the maximum amount then
               payable to Sellers in the event of a full exercise of Sellers'
               remaining Put Rights under the Master Tek Shareholders Agreement;
               such maximum amount shall be determined as of the date of the
               notice to Sellers that Buyer is seeking indemnification; and

                     (B)  The Buyer shall have no right to proceed against any
               assets of the Sellers other than their interest in the Promissory
               Note, Noncompetition Agreement and Master Tek Shareholder
               Agreement. This provision shall survive Closing and shall control
               in the event of a conflict with any provision of any document
               executed at Closing of the transactions contemplated by this
               Agreement.

          (e)  Rights of Offset. In the event the Sellers have denied the
               ----------------
Buyer's request for indemnification, in whole or in part, the Buyer shall have
the option of recouping all or any part of any Adverse Consequences it may
suffer by filing suit against the Sellers pursuant to Section 11(h) below and
notifying the Sellers in writing that the Buyer is exercising its rights of
offset under this Section 8(e).

               (i)   While Buyer's action against the Sellers is pending, Buyer
          shall have the right to withhold or to direct the Company to withhold,
          as applicable, (1) the principal payments due under the Promissory
          Note (but must continue to pay the interest to Sellers), (2) the
          Noncompetition Payments (as defined in the Noncompetition Agreement)
          and (3) any amounts due under a "Put Right" as defined in the Master
          Tek Shareholder Agreement (collectively, the "Withholds").

               (ii)  Buyer or the Company, as applicable, must pay the Withholds
          as they become due to a court registry or the escrow established
          pursuant to the Collateral Agreement, will be considered as payments
          made in a timely manner under each of the Promissory Note,
          Noncompetition Agreement and Master Tek

                                       27
<PAGE>

          Shareholder Agreement, and shall not constitute a default under any of
          such agreements.

               (iii) The Withholds shall not exceed (1) the amount Buyer
          reasonably believes the indemnification claim is worth, net of the
          amounts set forth in Section 8(d)(vi), or (2) the maximum limit on
          indemnification established by Section 8(d)(vii).

               (iv)  In the event that Buyer prevails on its claim for
          indemnification against Sellers, Buyer and Sellers shall direct the
          registry or escrow agent to release the Withholds deposited therein in
          accordance with this Section to Buyer. The recoupment by Buyer of any
          principal amounts under the Promissory Note shall affect the timing
          and amount of payments required under the Promissory Note in the same
          manner as if the Maker (as defined in the Promissory Note) had made a
          permitted prepayment (without premium or penalty) thereunder and
          recoupment of payments under the Noncompetition Agreement and Master
          Tek Shareholder Agreement shall constitute regular payments under each
          of those Agreements.

               (v)   In the event that Buyer does not prevail on its claim for
          indemnification against Sellers, (1) Buyer and Seller shall direct the
          registry or escrow agent to release the Withholds deposited therein in
          accordance with this Section to the Sellers, and (2) Buyer shall make
          to the Sellers an accelerated payment of principal under the
          Promissory Note in an amount equal to twice the principal amount of
          the Promissory Note actually withheld as part of the Withholds (the
          aggregate payment not to exceed the maximum amount of principal then
          remaining under the Promissory Note). The accelerated payment of
          principal under the Promissory Note to Sellers shall affect the timing
          and amount of payments required under the Promissory Note in the same
          manner as if the Maker had made a permitted prepayment (without
          premium or penalty) thereunder.

          (f)  Other Indemnification Provisions. Subject to the provisions of
               --------------------------------
Section 8(d)(vii), the foregoing indemnification provisions are in addition to,
and not in derogation of, any statutory, equitable, or common law remedy any
Party may have for breach of representation, warranty, or covenant. Each of the
Sellers hereby agrees that he, she or it will not make any claim for
indemnification against the Company by reason of the fact that he, she or it was
a director, officer, employee, or agent of any such entity or was serving at the
request of any such entity as a partner, trustee, director, officer, employee,
or agent of another entity (whether such claim is for judgments, damages,
penalties, fines, costs, amounts paid in settlement, losses, expenses, or
otherwise and whether such claim is pursuant to any statute, charter document,
bylaw, agreement, or otherwise) with respect to any action, suit, proceeding,
complaint, claim, or demand brought by the Buyer against such Seller (whether
such action, suit, proceeding, complaint, claim, or demand is pursuant to this
Agreement, applicable law, or otherwise).

          (g)  Limitation of Seller's Liability to the Company. The Parties
               -----------------------------------------------
hereby agree that any and all claims, counterclaims, demands, actions and causes
of action, suits, rights, liabilities,

                                       28
<PAGE>

debts, contracts, duties and obligations, of any kind and nature whatsoever,
whether known or unknown, whether arising under common law, in equity or any
statute, which the Company ever had, now has, or in the future may claim to have
against Sellers and which have arisen at any time on or prior to the date of
that certain Release and Limitation of Liability between Sellers and the Company
("Company Claims"), shall be included within the limitations and requirements
established by Section 8(d)(vi) and (vii) and Section 8(e) as though they were
claims for indemnification under this Agreement. In no event shall the total of
Buyer's claims for indemnification and the Company Claims ever exceed the
limitations established by Section 8(d)(vi) and (vii) and Section 8(e).

     9.   Tax Matters. The following provisions shall govern the allocation of
          -----------
responsibility as between Buyer and Sellers for certain tax matters following
the Closing Date:

          (a)  Section 338(h)(10) Election. The Sellers and Buyer agree that no
               ---------------------------
Party shall make an election under Section 338(h)(10) of the Code with respect
to the purchase and sale of the stock of the Company hereunder.

          (b)  Tax Periods Ending on or Before the Closing Date. Buyer shall
               ------------------------------------------------
prepare or cause to be prepared and file or cause to be filed all Tax Returns
for the Company for all periods ending on or prior to the Closing Date which are
filed after the Closing Date. Buyer shall permit Sellers to review and comment
on each such Tax Return described in the preceding sentence prior to filing and
shall permit Sellers to contest on reasonable grounds any taxes, penalties or
interest imposed by the taxing authorities. Sellers shall reimburse Buyer for
Taxes of the Company with respect to such periods within fifteen (15) days after
payment by Buyer or the Company of such Taxes.

          (c)  Tax Periods Beginning Before and Ending After the Closing Date.
               --------------------------------------------------------------
Buyer shall prepare or cause to be prepared and file or cause to be filed any
Tax Returns of the Company for Tax periods which begin before the Closing Date
and end after the Closing Date. Sellers shall pay to Buyer within fifteen (15)
days after the date on which Taxes are paid with respect to such periods an
amount equal to the portion of such Taxes which relates to the portion of such
Taxable period ending on the Closing Date. For purposes of this Section, in the
case of any Taxes that are imposed on a periodic basis and are payable for a
Taxable period that includes (but does not end on) the Closing Date, the portion
of such Tax which relates to the portion of such Taxable period ending on the
Closing Date shall (x) in the case of any Taxes other than Taxes based upon or
related to income or receipts, be deemed to be the amount of such Tax for the
entire Taxable period multiplied by a fraction the numerator of which is the
number of days in the Taxable period ending on the Closing Date and the
denominator of which is the number of days in the entire Taxable period, and (y)
in the case of any Tax based upon or related to income or receipts be deemed
equal to the amount which would be payable if the relevant Taxable period ended
on the Closing Date. Any credits relating to a Taxable period that begins before
and ends after the Closing Date shall be taken into account as though the
relevant Taxable period ended on the Closing Date. All determinations necessary
to give effect to the foregoing allocations shall be made in a manner consistent
with prior practice of the Company.

                                       29
<PAGE>

          (d)  Cooperation on Tax Matters.
               --------------------------

               (i)   Buyer, the Company and Sellers shall cooperate fully, as
          and to the extent reasonably requested by another Party, in connection
          with the filing of Tax Returns pursuant to this Section and any audit,
          litigation or other proceeding with respect to Taxes. Such cooperation
          shall include the retention and (upon the other Party's request) the
          provision of records and information which are reasonably relevant to
          any such audit, litigation or other proceeding and making employees
          available on a mutually convenient basis to provide additional
          information and explanation of any material provided hereunder. The
          Company agrees (A) to retain all books and records with respect to Tax
          matters pertinent to the Company relating to any taxable period
          beginning before the Closing Date until the expiration of the statute
          of limitations (and, to the extent notified by Buyer or Sellers, any
          extensions thereof) of the respective taxable periods, and to abide by
          all record retention agreements entered into with any taxing
          authority, and (B) to give the other Parties reasonable written notice
          prior to transferring, destroying or discarding any such books and
          records and, if another Party so requests, the Company shall allow
          such Party to take possession of such books and records.

               (ii)  Buyer and Sellers further agree, upon request, to use their
          commercially reasonable efforts to obtain any certificate or other
          document from any governmental authority or any other Person as may be
          necessary to mitigate, reduce or eliminate any Tax that could be
          imposed (including, but not limited to, with respect to the
          transactions contemplated hereby).

               (iii) Buyer and Sellers further agree, upon request, to provide
          the other Parties with all information that any Party may be required
          to report pursuant to Section 6043 of the Code and all Treasury
          Department Regulations promulgated thereunder.

          (e)  Certain Taxes. All transfer, documentary, sales, use, stamp,
               -------------
registration and other such Taxes and fees (including any penalties and
interest) incurred in connection with this Agreement, shall be paid by Sellers
when due, and Sellers will, at their own expense, file all necessary Tax Returns
and other documentation with respect to all such transfer, documentary, sales,
use, stamp, registration and other Taxes and fees, and, if required by
applicable law, Buyer will, and will cause its affiliates to, join in the
execution of any such Tax Returns and other documentation.

          (f)  Changes in Accounting Methods. Notwithstanding any other
               -----------------------------
provision of this Agreement, Sellers shall not be liable for any taxes, or any
interest and penalties on taxes, that arise solely as a result of a change in
accounting methods of the Company after the Closing.

     10.  Termination.
          -----------

          (a)  Termination of Agreement. The Parties may terminate this
               ------------------------
Agreement as provided below:

                                       30
<PAGE>

               (i)   The Buyer and the Sellers may terminate this Agreement by
          mutual written consent at any time prior to the Closing.

               (ii)  the Buyer may terminate this Agreement by giving written
          notice to the Sellers at any time prior to the Closing (A) in the
          event any of the Sellers has breached any material representation,
          warranty, or covenant contained in this Agreement in any material
          respect and the breach has continued without cure for a period of five
          (5) days after the notice of breach or (B) if the Closing shall not
          have occurred on or before April 30, 2000, by reason of the failure of
          any condition precedent under Section 7(a) hereof (unless the failure
          results primarily from the Buyer itself breaching any representation,
          warranty, or covenant contained in this Agreement); and

               (iii) the Sellers may terminate this Agreement by giving written
          notice to the Buyer at any time prior to the Closing (A) in the event
          the Buyer has breached any material representation, warranty, or
          covenant contained in this Agreement in any material respect, the
          Sellers have notified the Buyer of the breach, and the breach has
          continued without cure for a period of five (5) days after the notice
          of breach or (B) if the Closing shall not have occurred on or before
          April 30, 2000, by reason of the failure of any condition precedent
          under Section 7(b) hereof (unless the failure results primarily from
          any of the Sellers themselves breaching any representation, warranty,
          or covenant contained in this Agreement).

          (b)  Effect of Termination. If any Party terminates this Agreement
               ---------------------
pursuant to Section 10(a) above, all rights and obligations of the Parties
hereunder shall terminate without any Liability of any Party to any other Party
(except for any Liability of any Party then in breach).

     11.  Miscellaneous.
          -------------

          (a)  Press Releases and Public Announcements. No Party shall issue any
               ---------------------------------------
press release or make any public announcement relating to the subject matter of
this Agreement without the prior written approval of the Buyer and the Sellers;
provided, however, that any Party may make any public disclosure it believes in
good faith is required by applicable law or any listing or trading agreement
concerning its publicly-traded securities (in which case the disclosing Party
will use its reasonable best efforts to advise the other Parties prior to making
the disclosure).

          (b)  No Third-Party Beneficiaries. This Agreement shall not confer any
               ----------------------------
rights or remedies upon any Person other than the Parties and their respective
successors and permitted assigns.

          (c)  Entire Agreement. This Agreement, together with the Promissory
               ----------------
Note and the Agreements referred to in 7(a)(vi)-(xi), inclusive, constitutes the
entire agreement among the Parties and supersedes any prior understandings,
agreements, or representations by or among the Parties, written or oral, to the
extent they related in any way to the subject matter hereof.

                                       31
<PAGE>

          (d)  Succession and Assignment. This Agreement shall be binding upon
               -------------------------
and inure to the benefit of the Parties named herein and their respective
successors and permitted assigns. No Party may assign either this Agreement or
any of his or its rights, interests, or obligations hereunder without the prior
written approval of the Buyer and the Sellers; provided, however, that the Buyer
may (i) assign any or all of its rights and interests hereunder to one or more
of its Affiliates and (ii) designate one or more of its Affiliates to pay and
perform its obligations hereunder (in any or all of which cases the Buyer
nonetheless shall remain jointly and severally liable for the payment and
performance of all of the obligations of Buyer hereunder).

          (e)  Counterparts. This Agreement may be executed in one or more
               ------------
counterparts, each of which shall be deemed an original but all of which
together will constitute one and the same instrument.

          (f)  Headings.  The section headings contained in this Agreement are
               --------
inserted for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

          (g)  Notices. All notices, requests, demands, claims, and other
               -------
communications hereunder will only be in writing. Any notice, request, demand,
claim, or other communication hereunder shall only be deemed duly given on the
second business day ("business day" means Mondays through Fridays other than
days on which the United States Postal Service does not make regularly scheduled
deliveries of first class mail) after it is deposited with the United States
Postal Service for delivery by registered or certified mail, return receipt
requested, postage prepaid, and addressed to the intended recipient as set forth
below:

          If to Sellers:    Milton R. DiGregorio
                            Beverly A. DiGregorio
                            Milton R. DiGregorio and Beverly A. DiGregorio 2000
                            Irrevocable Family Trust
                            273 Vaquero Drive
                            Boulder, Colorado 80303
                            Telecopier: (303) 499-0125

          Copy to:          Douglas B. Koff
                            Waldbaum, Corn, Koff & Berger, P.C.
                            303 East 17/th/ Avenue, Suite 940
                            Denver, Colorado 80203
                            Telecopier: (303) 861-0601

          If to Southwest:  Southwest Water Company
                            225 North Barranca Avenue, Suite 200
                            West Covina, California  91791-1605
                            Attention: Vice President of Finance
                            Telecopier: (626) 915-1558

                                       32
<PAGE>

          If to the Company:  Master Tek International, Inc.
                              9168 Marshall Place
                              Westminster, Colorado  80031-2922
                              Telecopier: (303) 650-1094

          Copy to:            Southwest Water Company
                              225 North Barranca Avenue, Suite 200
                              West Covina, California  91791-1605
                              Attention: Vice President of Finance
                              Telecopier: (626) 915-1558

          Copy to:            Latham & Watkins
                              650 Town Center Drive, 20/th/ Floor
                              Costa Mesa, California  92626
                              Attention: James Daniels, Esq.
                              Telecopier: (714) 755-8290

Any Party may send any notice, request, demand, claim, or other communication
hereunder to the intended recipient at the address set forth above using any
other means (including personal delivery, expedited courier, messenger service,
telecopy, telex, ordinary mail, or electronic mail), but no such notice,
request, demand, claim, or other communication shall be deemed to have been duly
given unless and until it actually is received by the intended recipient as
proven by the sender. Any Party may change the address to which notices,
requests, demands, claims, and other communications hereunder are to be
delivered by giving the other Parties notice in the manner herein set forth.

          (h)  Governing Law; Jurisdiction; Venue. This Agreement shall be
               ----------------------------------
governed and construed in accordance with the laws of the State of Colorado
excluding any conflicts or choice of law rule or principle that might otherwise
refer construction or interpretation of this Agreement to the substantive law of
another jurisdiction. Each of the Parties submits to the jurisdiction of any
state or federal court sitting in Denver, Colorado, in any action or proceeding
arising out of or relating to this Agreement and agrees that all claims in
respect of the action or proceeding may only be heard and determined in any such
court. These courts shall be the exclusive forum for the determination of any
claim or right arising out of or relating to this Agreement. Each of the Parties
waives any defense of inconvenient forum to the maintenance of any action or
proceeding so brought and waives any bond, surety, or other security that might
be required of any other Party with respect thereto. No Party will request the
court in any such action or proceeding to enter relief (whether for damages or
injunctive relief) until the opposing Party has had not less than seven (7) days
to respond to the request or motion for relief. Any Party may make service on
any other Party by sending or delivering a copy of the process to the Party to
be served at the address and in the manner provided for the giving of notices in
Section 11(g) of this Agreement. Each Party hereby waives any and all rights it
may have to a trial by jury. The parties acknowledge that by executing THIS
AGREEMENT, they are giving up all rights, if any, to a trial by jury.

          (i)  Attorneys Fees. The fees and costs, including reasonable
               --------------
attorneys' fees, incurred by any Party to this Agreement as a result of any
dispute arising under or related to this

                                       33
<PAGE>

Agreement shall be awarded to the prevailing party. If there is no prevailing
party, fees and costs may be awarded in the discretion of the court which, in
making such award, shall assess the relative good or bad faith of the Parties
throughout the dispute.

          (j)  Amendments and Waivers. No amendment of any provision of this
               ----------------------
Agreement shall be valid unless the same shall be in writing and signed by the
Buyer and the Sellers. No waiver by any Party of any default, misrepresentation,
or breach of warranty or covenant hereunder, whether intentional or not, shall
be deemed to extend to any prior or subsequent default, misrepresentation, or
breach of warranty or covenant hereunder or affect in any way any rights arising
by virtue of any prior or subsequent such occurrence. (k) Severability. Any term
or provision of this Agreement that is invalid or unenforceable in any situation
in any jurisdiction shall not affect the validity or enforceability of the
remaining terms and provisions hereof or the validity or enforceability of the
offending term or provision in any other situation or in any other jurisdiction.

          (l)  Expenses. Each of the Parties and the Company will bear his or
               --------
its own costs and expenses (including legal fees and expenses) incurred in
connection with this Agreement and the transactions contemplated hereby.

          (m)  Construction. Any reference to any federal, state, local, or
               ------------
foreign statute or law shall be deemed also to refer to all rules and
regulations promulgated thereunder, unless the context requires otherwise. The
word "including" shall mean including without limitation. The Parties intend
that each representation, warranty, and covenant contained herein shall have
independent significance. If any Party has breached any representation,
warranty, or covenant contained herein in any respect, the fact that there
exists another representation, warranty, or covenant relating to the same
subject matter (regardless of the relative levels of specificity) which the
Party has not breached shall not detract from or mitigate the fact that the
Party is in breach of the first representation, warranty, or covenant.

          (n)  Incorporation of Exhibits and Schedules. The Exhibits and
               ---------------------------------------
Schedules identified in this Agreement are incorporated herein by reference and
made a part hereof.

                                     *****

                                       34
<PAGE>

          IN WITNESS WHEREOF, the Parties hereto have executed this Agreement on
the date first above written.

                                   SOUTHWEST WATER COMPANY,
                                   a Delaware corporation

                                   By: /s/ PETER J. MOERBEEK
                                       ---------------------
                                   Title: CFO
                                          ------------------

                                   MILTON R. DIGREGORIO, an individual

                                   By: /s/ MILTON R. DIGREGORIO
                                       ------------------------

                                   BEVERLY A. DIGREGORIO, an individual

                                   By: /s/ BEVERLY A. DIGREGORIO
                                       -------------------------

                                   MILTON R. DIGREGORIO AND BEVERLY A.
                                   DIGREGORIO 2000 IRREVOCABLE FAMILY TRUST

                                   By: /s/ BEVERLY A. DIGREGORIO
                                       -------------------------
                                   Title:  Trustee

                                       35

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