NATIONAL ENVIRONMENTAL SERVICE CO
8-K, 1999-05-21
HAZARDOUS WASTE MANAGEMENT
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<PAGE>
 
                   U. S. SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                   FORM 8-K
                                CURRENT REPORT
    Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934



                 Date of Report______ May 18, 1999___________



                      NATIONAL ENVIRONMENTAL SERVICE CO.
      ------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)


             Oklahoma                   000-24470              73-1296420
      ------------------------------------------------------------------------
      (State or other juris-        Commission File No.    (I.R.S. Employer
      diction of incorporation                             Identification No.)
      or organization)


      12331 East 60th Street          Tulsa, Oklahoma              74146
      ------------------------------------------------------------------------
      (Address of principal executive offices)                   (Zip Code)


                                 918-250-2227
                        -------------------------------
                          (Issuer's telephone number)
<PAGE>
 
Item 2.  Acquisition or Disposition of Assets.

     On May 7, 1999, National Environmental Service Co. (hereafter "NESCO")
acquired the assets and assumed certain liabilities of TET Environmental
Services, Inc., Columbia, South Carolina, (hereafter "TET").  TET was a provider
of environmental consulting and services to the fueling systems industry and
other industries in South Carolina.  Assets acquired include furniture,
fixtures, equipment, vehicles, contracts, transferable licenses, accounts
receivable, inventory; work in process, leasehold improvements, and cash
operating  account. Additionally, NESCO acquired all designs, methods,
inventions, and know-how; all trademarks, trade names, service marks, and
copyrights claimed or used, customer lists, and corporate names used.  Certain
assets were excluded from the sale and totaled $57,302.  The assets excluded
include two vehicles and miscellaneous office furniture used by the seller's
principal shareholders.  NESCO assumed liabilities totaling approximately
$237,000.  The exact amount of such liabilities as of April 30, 1999, shall be
determined by an independent audit.

     The total purchase price is $2,200,000 which was determined by arm's-length
negotiations, with $1,600,000 to be paid at closing and $600,000 to be paid
following collection of accounts receivable acquired and less any adjustments to
the purchase price to be determined by an independent audit of the financial
records of TET.  Actual cash paid at closing was $1,365,129 and reflect
adjustments as follows:  (i) reductions in the amount of the net book value of
the excluded assets, (ii) reductions for the amount of distributions to
Shareholders since December 31, 1998, and (iii) additions for the net book value
of the excluded liabilities to be retained by TET. An additional $600,000 (less
any adjustments determined in accordance with the agreement) will be paid on the
earlier of (i) 90 days after the date of closing, or (ii) the date on which all
receivables purchased as of the date of closing shall have been collected and
the independent audit of the financial records of TET has been completed.  The
cash portion of the purchase price was financed through an increase in the
amount available under NESCO's current credit facility with the Bank of
Oklahoma, N.A., and a new secured loan arranged with the bank.

     NESCO has agreed to acquire the buildings and real estate occupied by TET.
The shareholders of TET, William Wimberly and Harry D. O'Brien, own and lease
the property to TET.  The purchase price is estimated to be $600,000 and will be
determined by an appraisal of the property.

     NESCO intends to use the assets acquired to conduct the same business and
services in which they have been used by TET and has hired all of the TET
employees except the two principal shareholders.  NESCO's existing Columbia
office will be combined with the TET office.

Item 7.  Financial Statements and Exhibits.

     (a)  The required financial statements of the assets acquired by the
          Registrant will be filed by an amendment to this report which will be
          filed within 60 days from May 22, 1999.

     (b)  The pro forma financial information required in connection with the
          reported 
<PAGE>
 
          transaction will be filed by an amendment to this report which will be
          filed within 60 days from May 22, 1999.

     (c)  Exhibits.  The following exhibit is filed herewith.

     2.1  Asset Purchase Agreement dated as of May 3, 1999, by and between the
          Registrant and TET Environmental Services, Inc. (Schedules and
          exhibits are omitted from this filing but copies thereof will be
          submitted to the Securities and Exchange Commission upon request).


                                  SIGNATURES

  Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused his report to be signed on its behalf by the duly
authorized undersigned officer of the Registrant.

                                National Environmental Service Co.



Date:   May 18, 1999
                                By: /s/ Larry G. Johnson
                                   ------------------------------------------
                                Larry G. Johnson, Vice President and Secretary-
                                Treasurer
<PAGE>
 
                 Definitive Agreement, Exhibits, and Schedules

I.   Definitive Agreement date May 3, 1999

II.  Exhibits and Schedules (omitted from this filing but copies thereof will be
     submitted to the Securities and Exchange Commission upon request):

          Exhibit A - TET Environmental Services, Inc. Excluded Assets

          Exhibit B - TET Environmental Services, Inc. Financial Statements as
                         of December 31, 1999

          Exhibit C - TET Environmental Services, Inc. Distributions to
                         Shareholders

          Exhibit D - Agreement Not to Compete - TET Environmental Services, 
                         Inc.
                      Agreement Not to Compete - William Wimberly
                      Agreement Not to Compete - Harry D. O'Brien

          Exhibit E - TET Environmental Services, Inc. Excluded Liabilities

          Schedule 1 - TET Environmental Services, Inc. Exceptions to Absence of
                         Certain Charges

          Schedule 2 - Projects to be Completed by NESCO

          Schedule 3 - Fair Market Value of 1999 Property and Equipment

          Schedule 4 - Certain Permits, Etc.

<PAGE>
 
                                                                     EXHIBIT 2.1
                                  May 3, 1999

TET Environmental Services, Inc.
and Shareholders of TET Environmental Services, Inc.
521 Clemson Road
Columbia, SC 29229

Re: Acquisition of certain assets of TET Environmental Services, Inc.
and the acquisition of certain real estate owned by Shareholders of TET
Environmental Services, Inc.

Gentlemen:

     This Definitive Agreement contains the terms of the acquisition by National
Environmental Service Co., an Oklahoma corporation (hereafter "NESCO"), of
certain assets, and the assumption of certain liabilities and obligations of TET
Environmental Services, Inc., a South Carolina corporation (hereafter "TET"),
and the acquisition of the real estate located at 521 Clemson Road, Columbia,
South Carolina, and occupied by TET and owned by the Shareholders of TET
(hereafter "Shareholders").  The effective date of the acquisition shall be
April 30, 1999 or at Closing Date if earlier.  For purposes herein, the
acquisition of the assets of TET and the real property occupied by TET in
accordance with the terms and conditions set forth herein shall be referred to
collectively as the "Transaction".

I. ACQUISITION OF ASSETS

     1.  Assets to be Purchased -
         ----------------------  

     NESCO shall acquire all assets owned by TET as of April 30, 1999 or at
Closing Date if earlier, except those certain excluded assets set forth on
Exhibit A attached hereto (the "Excluded Assets").  However, subject to Article
II, Section 3 below, said assets shall not be less than all of TET's assets as
shown on the December 31, 1998 financial statements attached as Exhibit B.
Since December 31, 1998, TET has not made, and shall not prior to the date of
Closing make, any distributions of accumulated earnings and profits to the
Shareholders, except as listed on Exhibit C attached hereto.  Subject to Article
II, Section 3 below, the accuracy of the financial statements shown at Exhibit B
is guaranteed by shareholders.  Subject to Article II, Section 3 below, any
reductions in assets or net worth below those amounts shown in the Balance Sheet
attached as Exhibit B
<PAGE>
 
shall cause a dollar for dollar reduction in the purchase price.

     Assets shall include but not be limited to:  (a) all designs, methods,
inventions and know-how related thereto, (b) all trademarks, trade names,
service marks, and copyrights claimed or used by TET whether or not they have
been registered, and (c) all customer lists of TET, and (d) corporate names used
by TET (collectively "Business Property Rights"), constitute all such
proprietary rights owned or held by TET and which are reasonably necessary to,
or used in the conduct of the business of TET.  All such methods, inventions and
know-how constitute trade secrets of TET within the meaning of all applicable
laws, and, to TET's knowledge, TET has taken all reasonable necessary steps
required by law to protect these trade secrets as such.  TET owns or has valid
rights to use all Business Property Rights without any known conflict with the
rights of others.  To TET's knowledge, no person has made or threatened to make
any claims that the operation of the business of TET is in violation of or
infringes any Business Property Rights or any other proprietary or trade rights
of any third person.  To TET's knowledge, no third person is in violation of or
is infringing upon any Business Property Rights.

     2.  Liabilities -
         -----------  

     NESCO shall assume all liabilities of TET as of April 30, 1999 and
subsequently incurred in the ordinary course of business, except those certain
excluded liabilities set forth in Exhibit E (the "Excluded Liabilities").
However, subject to Article II, Section 3 below, (i) the balance of liabilities
shall not exceed the amount of liabilities in the financial statements shown as
Exhibit B, and (ii) should the balance of liabilities exceed the amount of
liabilities in the financial statements after reducing the liabilities by the
amount of the Excluded Liabilities shown in Exhibit E, the purchase price shall
be adjusted in accordance with the provisions of Section 5 of this Article.

     3.  Assignment -
         ----------  

     Subject to the limitations contained herein, this agreement is contingent
upon TET's ability to assign without penalty or loss to NESCO all existing
contracts, backlog, customer lists, deposits, good and merchantable title to
assets, accounts receivable, receivables accrued as work in progress and not
invoiced, licenses, and such other rights as TET presently enjoys at its
Columbia office; provided however, NESCO shall not be permitted to disclose
prior to the Closing 

                                       2
<PAGE>
 
the existence of this Definitive Agreement nor the transactions contemplated
herein to any such third party whose consent may be required.

     4.  Acquisition of Real Estate -
         --------------------------  

     NESCO shall purchase the real estate (buildings and land) leased by TET
from the Shareholders, located at 521 Clemson Road, Columbia, South Carolina
29229.  It is a condition of this agreement that NESCO acquire this property in
accordance with the terms and conditions outlined in this Agreement.

     5.  Purchase Price -
         --------------  

               A. Assets of TET - $2,200,000.00 less (i) the net book value of
the Excluded Assets as set forth on Exhibit A attached hereto, less (ii) the
amount of distributions to the Shareholders since December 31, 1998 of
accumulated earnings and profits as set forth on Exhibit C attached hereto, and
plus (iii) the net book value of the Excluded Liabilities as set forth in
Exhibit E, payable as follows: At closing TET shall receive $1,600,000 less (i)
the net book value of the Excluded Assets as set forth on Exhibit A attached
hereto, and (ii) the amount of distributions to the Shareholders since December
31, 1998 of accumulated earnings and profits as set forth on Exhibit C attached
hereto, and plus (iii) the net book value of the Excluded Liabilities as set
forth in Exhibit E, which shall be paid in immediately available funds. The
remaining $600,000 shall be immediately paid to TET on the earlier of (i) 90
days after date of closing, or (ii) the date on which all receivables purchased
as of the date of closing shall have been collected and the independent audit of
the financial records of TET on which this transaction is based is completed.
Should any receivables not be collected within ninety (90) days after the date
of closing, then the amount of the uncollected receivables shall be deducted
from the $600,000 retainage (and only the $600,000 retainage), and the
uncollected receivables shall be reassigned to TET. NESCO shall use its good
faith best efforts to timely collect any and all accounts receivable purchased
from TET hereunder. NESCO shall keep TET and the each Shareholder informed of
the status of such collections, and NESCO hereby agrees to apply any payment
received to the account for which payment is designated. If the payer does not
designate the account to which the payment is to be applied, the payment will be
applied to the oldest accounts receivable due from payer. TET and each
Shareholder shall be permitted to participate in the collection activities of
any and all such accounts receivable. In the event any accounts receivable are
returned to TET as provided above, NESCO shall not interfere with TET's and
Shareholder's reasonable and lawful attempts to collect such accounts
receivables and will 

                                       3
<PAGE>
 
promptly pay over to TET any proceeds of such accounts receivable that are paid
to NESCO after any such re-assignment. Additionally, should the independent
audit described in Article IV, Section 2 herein reveal any material adverse
changes (which for purposes herein shall be defined to be $2,500 or more in the
aggregate) in the financial statements or financial condition of TET as
presented by TET and Shareholders, such amounts determined by the independent
auditors shall be deducted from the $600,000 retainage. Notwithstanding anything
contained herein to the contrary, (i) in the event such audited financial
statements of TET are not prepared and delivered to TET and the Shareholders
within ninety (90) days after the date of Closing, NESCO shall be deemed to have
forever waived such financial audit purchase price adjustment set forth herein,
and (ii) no deduction shall occur from the $600,000 retainage related to the
above-described audit unless the net book value of the assets acquired hereunder
as of the date of closing, less the liabilities assumed by NESCO hereunder shall
be less than the sum of (a) One Million One Hundred Twelve Thousand and No/100
Dollars ($1,112,000.00), less (b) the net book value of the Excluded Assets set
forth on Exhibit A attached hereto, less (c) the aggregate amount of the
distributions to Shareholders set forth on Exhibit C attached hereto. However,
subject to Article II, Section 3, any reduction in the assets to be acquired
hereunder and/or any increase in liabilities to be assumed hereunder for the
period from January 1, 1999 to closing date that are not made in the ordinary
course of business shall cause a dollar for dollar reduction in the retainage.

          B.   Real Estate - The sales price of the real estate shall be
determined by obtaining an appraisal report on said real estate jointly signed
by each of three qualified appraisers mutually agreed upon by NESCO and the
Shareholders.  The sales price shall be equal to the fair market value of the
real estate as conclusively indicated in the appraisal report.  The purchase of
the real estate shall occur as soon as practical after completion of the
appraisal, examination of the title by an attorney selected by NESCO, and
preparation of any and all documents necessary to transfer good and merchantable
title to NESCO.  It is agreed between Shareholders and NESCO that the Closing
Date for the acquisition of the subject real estate may occur after the Closing
Date for the acquisition of the assets of TET in accordance with this Agreement,
but in no event after July 31, 1999, for any reason unless the parties hereto
mutually agree otherwise.  NESCO and TET shall each pay one-half of the cost of
the appraisals report.  It is further agreed that in the event the date of
closing for the acquisition of the real estate occurs after April 30, 1999, then
NESCO shall pay rent to the Shareholders for NESCO's occupancy of said real
estate at a rental rate of Three 

                                       4
<PAGE>
 
Thousand Seven Hundred Fifty and No/100 Dollars ($3,750.00) per month, payable
in advance, commencing on the effective date of May 1, 1999, and continuing
thereafter on the first (1st) day of each month until the closing of the
acquisition by NESCO of the real estate. The rent shall be prorated for the
number of days remaining in the month in which the closing of the real estate
shall occur. At date of closing on the real estate, Shareholders shall pay NESCO
an amount equal to the real estate taxes (including penalties and interest, if
any) that are accrued and unpaid as of such date.

II.  REPRESENTATIONS AND WARRANTIES OF TET AND SHAREHOLDERS

     TET and the Shareholders, jointly and severally, do hereby represent,
warrant and covenant to NESCO as follows:

     1.  Existence; Good Standing -
         ------------------------  

     TET is a corporation duly incorporated, validly existing and in good
standing under the laws of the State of South Carolina.  TET is duly licensed or
qualified to do business and is in good standing under the laws of all other
jurisdictions in which the character of the properties owned or leased by it
therein or in which the transaction of its business makes such qualification
necessary or the failure to be so qualified would not have a material adverse
effect on TET or its business, assets or operations.

     2.  Authorization; Validity and Effect of Agreements -
         ------------------------------------------------- 

     The execution and delivery of this Agreement and all agreements
contemplated hereby by TET and Shareholders and the consummation by it of the
transactions have been duly authorized by all requisite corporate action, except
that final approval of TET's Board of Directors and Shareholders is a condition
to this Agreement becoming a binding and enforceable obligation of TET.  Upon
approval of this Agreement by TET's Board of Directors and Shareholders, this
agreement will constitute, and all agreements and documents to be executed and
delivered under this Agreement by TET when so executed and delivered for value
received will constitute, the valid and legally binding obligations of TET
enforceable in accordance with their terms.  At closing, the execution and
delivery of this agreement does not and the consummation of the transactions
contemplated hereby will not (a) require the consent of any third party, (b)
result in the breach of 

                                       5
<PAGE>
 
any term or provision of, or constitute a default under, or result in the
acceleration of or entitle any party to accelerate any obligation under, or
result in the creation or imposition of any lien upon any part of the property
of TET pursuant to any provision of any order, judgment, arbitration award,
injunction, decree, indenture, mortgage, lease, license, lien, or other
agreement or instrument to which TET or any of the Shareholders is a party or by
which any of them is bound, or (c) violate or conflict with any provision of the
bylaws or certificate of incorporation of TET.

     3.  Financial Statements -
         --------------------  

     Subject to the following, shareholders and TET represent and warrant that
each of the TET financial statements (which include the December 31, 1998
financial statements and all subsequent financial statements and supporting
documentation submitted to NESCO up to and including the date of closing) are in
accordance with the books and records of TET, represent bona fide transactions,
fairly presents the assets, liabilities, results of operations and financial
condition and position of TET as at or as of their respective dates and are
prepared on a basis consistent with accounting principles and policies used by
TET in previous years, and, to the knowledge of TET, none of the TET financial
statements contains any untrue statements of a material fact or omits to state
any material fact necessary in order to make statements contained in this
section or therein not misleading.  For all purposes herein including but not
limited to any adjustment in the purchase price, in determining whether a
financial statement of TET is accurate and fairly presents the financial
position at the date thereof: (i) any understatement or omission of a liability
or expense, etc., will be offset by any understatement or omission of an asset
and/or an amount of revenue, etc., and vice versa; (ii) the subject financial
statement will be considered as a whole; and (iii) generally accepted accounting
principles shall be the standard by which adjustment in the purchase price shall
be determined.  It is understood that adjustments for uncollected accounts
receivable will be determined by the provisions of Article I, Section 5, of this
Agreement.

     4.  Changes in Financial Records -
         ----------------------------  

     TET and Shareholders agree to not make any material changes in their method
of accounting for the assets and liabilities and income and expense of TET from
that used to generate the December 31, 1998 financial statements and other
records submitted to NESCO for review.  Should there be any changes of a
material nature in the information supplied to NESCO, TET and Shareholders will

                                       6
<PAGE>
 
immediately notify NESCO representatives.


     5.  Undisclosed Liabilities -
         -----------------------  

     TET has no liabilities or obligations, contingent or otherwise, which are
not reflected or provided for in the TET financial statements for the period
ending December 31, 1998, except those arising after December 31, 1998, which
are in the ordinary course of business, in each case in normal amounts, and none
of which is material.

     6.  Absence of Certain Changes or Events -
         ------------------------------------  

     For the period commencing December 31, 1998, and ending on the date of
closing, TET has not and shall not, except as set forth on Schedule 1 attached
hereto:

               A.  Adopted, amended, or increased the payments to or benefits
under, any profit sharing, bonus, deferred compensation, savings, insurance,
pension, retirement, or other employee benefit plan for or with any employees of
TET.

               B.  Incurred any obligation or liability (fixed or contingent),
except (i) normal trade or business obligations incurred in the ordinary course
of business and consistent with past practice, none of which is materially
adverse, or, (ii) in connection with this Agreement and the transactions
contemplated hereby.

               C.  Discharged or satisfied any lien or paid any obligation or
liability (fixed or contingent), other than in the ordinary course of business
and consistent with past practice.

               D.  Subjected to any lien any of its assets or properties (other
than mechanic's, materialman's, and similar statutory liens arising in the
ordinary course of business and purchase money security interest arising as a
matter of law between the date of delivery and payment pursuant to transactions
which occurred in the ordinary course of business and which are reflected on the
TET financial statements presented to NESCO).

               E.  (i) Transferred, leased, or otherwise disposed of any of its
(a)

                                       7
<PAGE>
 
assets or properties (other than capital equipment) except for a fair
consideration in the ordinary course of business and consistent with past
practice, or (b) capital equipment, or (ii) acquired any (a) assets or
properties (other than capital equipment) except in the ordinary course of
business and consistent with past practice, or (b) capital equipment.

               F.  Canceled or compromised any debt or claim, except in the
ordinary course of business and consistent with past practice.

               G.  Waived or released any rights of material value.

               H.  Transferred or granted, or amended any rights under any
concessions, leases, licenses, agreements, patents, inventions, trademarks,
trade names, service marks or copyrights or with respect to any know-how.

               I.  Made or granted any bonus or wage or salary increase
applicable to any employee or group or classification of employees generally,
entered into any employment contract with, or made any loan to, or made or
agreed to make any severance payment, or entered into any material transaction
of other nature with, any officer or employee of TET.

               J.  Suffered any casualty loss or damage (whether or not such
loss or damage shall have been covered by insurance) which affects in any
material respect its ability to conduct business.

               K.  Suffered any material adverse change in the financial
condition, business, affairs, or prospects of TET.

     7.  Title to Property and Assets -
         ----------------------------  

     TET has good and marketable title to all of the properties and assets used
by it in the conduct of its business (including, without limitation, the assets
to be purchased by NESCO hereunder and any other properties and assets reflected
in the balance sheet submitted by TET except any thereof disposed of for value
in the ordinary course of business) and none of suchproperties or assets are,
except as disclosed in the balance sheet or schedules, subject to a contract of
sale not in the ordinary course of business.

     8.  No Breach or Default -
         --------------------  

                                       8
<PAGE>
 
          A.   TET is not in default under any material agreement or contract to
which it is a party or by which it is bound, nor has any event occurred which,
after the giving of notice or the passage of time or both, would constitute a
default under any such agreement or contract.  To TET's knowledge, the parties
to such agreements or contracts have fulfilled their obligations under such
agreements or contracts in all material respects and are not threatened with
insolvency.

          B.   Neither the execution and delivery of this Agreement by TET or
any Shareholder nor the consummation of the transactions contemplated hereby to
be performed by TET and the Shareholders will (i) violate or conflict with any
provision of the Articles of Incorporation or Bylaws of TET, as currently in
effect, or (ii) violate or conflict with any provision of any law, rule,
regulation, order, permit, certificate, writ, judgment, injunction, decree,
determination, award or other decision of any governmental entity, other
regulatory or self-regulatory body or association or arbitrator binding upon TET
or any Shareholder or any of their properties, except where such violations or
conflicts would not in the aggregate have a material adverse effect on the
business, or the purchased assets or on the ability of TET and the Shareholders
to consummate the transactions contemplated hereby.

          C.   At closing, neither the execution and delivery of this Agreement
nor the consummation of the transactions contemplated hereby to be performed by
TET or Shareholders will result in a breach of or constitute a default (or with
notice or lapse of time or both result in a breach of or constitute a default)
under, or give rise to a right of termination, cancellation, acceleration or
repurchase of any obligation or a right of first refusal with respect to any
material property or asset or a loss of a material benefit or the imposition of
a material penalty under, any of the terms, conditions or provisions of: (i) any
mortgage, indenture, loan or credit agreement or any other agreement or
instrument evidencing indebtedness for money borrowed to which TET or any
Shareholder is a party or by which it or any of its properties is bound or
affected, or pursuant to which TET or any Shareholder has guaranteed the
indebtedness or preferred stock of any person or entity, or (ii) any lease,
license, tariff, contract or other agreement or instrument to which TET or any
Shareholder is a party or by which it or any of their properties is bound or
affected, except:

                           (x)  for any such breaches, defaults, rights, losses
or penalties that do not have a material adverse effect on the purchased assets
or the business, financial condition or results of operations of TET or on the
ability of

                                       9
<PAGE>
 
TET or any Shareholder to consummate the transactions contemplated hereby, and

                           (y)  for such third party consents as will be
obtained prior to the Closing.

               D.   Neither the execution and delivery by TET and the
Shareholders of this Agreement nor the consummation of the transactions
contemplated hereby to be performed by TET or the Shareholders will result in,
or require, the creation or imposition of any mortgage, deed of trust, pledge,
lien, security interest or other charge or encumbrance of any nature upon or
with respect to any of the purchased assets.

     9.   Employee Matters -
          ----------------    

     All of the personnel employed by TET in the Business are "at will"
employees. TET has no director, officer and employee retirement, welfare or
other benefit plans, agreements, practices, programs or arrangements available
to its employees that would be an obligation or liability of NESCO.

     10.  Litigation -
          ---------- 

               A.   There is no claim, action, suit, proceeding, arbitration,
investigation or inquiry now pending or, to the knowledge of TET, threatened
against, relating to or affecting any of its assets or business or that
questions the validity of this Agreement or affects the transactions
contemplated herein; nor is there any known basis for any such claim, action,
suit, proceeding, arbitration, investigation or inquiry.

               B.   Neither TET nor any of the Shareholders or any of the
officers, directors or employees of TET has been permanently or temporarily
enjoined or prohibited by order, judgment or decree of any governmental entity,
other regulatory or self-regulatory body or association, or arbitrator from
engaging in or continuing any conduct or practice in connection with the
business of TET.

               C.   There is not in existence any order, judgment or decree of
any governmental entity, other regulatory or self-regulatory body or association
or arbitrator enjoining or prohibiting TET from taking, or requiring TET to
take, any action of any kind which are subject or bound.

                                       10
<PAGE>
 
     11.  Compliance with Laws -
          --------------------  

     Except where it would not have a material adverse effect upon the purchased
assets or business, TET is in compliance in all material respects with all legal
requirements applicable to the ownership, operation and use of the its business
and assets, and TET has not received notice of any noncompliance or alleged
noncompliance with any legal requirement relating or applicable to the purchased
assets or to the operation of its business, the existence or enforcement of
which would have a material adverse effect on NESCO's ability to operate them on
the same basis as currently conducted and operated or which would require the
payment of refunds, fines, penalties or restitution in respect of matters
occurring prior to the Closing.

     12.  Permits -
          -------

     TET has all permits, licenses, certificates, authorizations, orders and
approvals necessary to the ownership, use or operation of its assets and the
operation of its business in the manner heretofore operated by TET. Such permits
are in full force and effect, all fees and other payments due and owing in
connection with such permits have been paid in full, and there are no unpaid
fees or other payments that could cause the lapse or revocation of any of such
permits. Each of such Permits can be assigned to NESCO upon the consummation of
the transactions contemplated hereby without the prior approval of any person
except as disclosed on Schedule 4.

     13.  Bills and Invoices -
          ------------------  

     Except for liabilities which NESCO has expressly agreed to assume
hereunder, all bills and other payments due and payable by TET with respect to
its assets and business have been or will be paid in full in the ordinary course
of business, and no labor, material or services have been provided or performed
with respect to the purchased assets that have not been or will not be paid in
full.

     14.  Software; Year 2000 Compliance -
          ------------------------------  

     Equipment installed on projects by TET prior to closing, whether
manufactured by TET or manufactured by another person, is designed to be used
prior to, during, and after the calendar year 2000 AD, and without human
intervention will correctly recognize, calculate, process, sequence, store and

                                       11
<PAGE>
 
transmit date data without error or interruption, including leap years, and
including errors or interruptions from functions which may involve date data
from more than one century.  Date calculations involving either a single century
or multiple centuries will neither cause an abnormal ending nor generate
incorrect or unexpected results.  When sorting by date, all records will be
sorted in accurate sequence and when the date is used as a key, records will be
read and written in accurate sequence.  As used in the previous sentence,
accurate sequence means, by way of example, that records will be read, written
and sorted in ascending order so that the year 1999 is before the year 2000.

     15.  Customers and Suppliers -
          -----------------------  

     The relationships of TET with its material customers and suppliers are good
commercial working relationships.  No material customer or supplier (i) has
canceled or threatened in writing to cancel or otherwise modify its relationship
with TET, or (ii) to the best of TET's knowledge, intends to cancel or otherwise
modify its relationship with TET.  The acquisition of the Business by Buyer will
not, to the best knowledge of TET, adversely affect the relationship of Buyer
(as successor to the operation of the Business) with any such material customers
or suppliers.

     16.  Labor Matters -
          -------------  

     There are no activities or controversies, including, without limitation,
any labor organizing activities, election petitions or proceedings, proceedings
preparatory thereto, unfair labor practice complaints, labor strikes, disputes,
slowdowns, or work stoppages, pending or, to the best of the knowledge of TET or
the Shareholders, threatened, between TET or any of its subsidiaries and any of
its or their employees.

     17.  Taxes -

     All taxes due and payable by TET for all periods ending on or before the
Closing Date have been paid by TET in full, or have been reserved against in the
Financial Statements.  There are no federal, state or local tax liens upon any
of the Assets.  All returns and reports of Taxes required to be filed by or with
respect to TET on or before the Closing Date have been filed by TET, and all
Taxes due as shown thereon have been paid by TET.  No issues have been raised
(or are currently pending) by any governmental authority in connection with any
of such 

                                       12
<PAGE>
 
returns or reports that have not been resolved.

          18.  No Misrepresentation or Omission -
               --------------------------------  

          No representation, warranty or statement made or provided by TET or
the Shareholders in this Agreement, or in any schedule hereto or any certificate
or other document furnished or to be furnished by TET and/or the Shareholders
pursuant hereto, contains or will contain any known untrue statement of a
material fact or omits or will omit to state a material fact required to be
stated or which is necessary in order to make the statements that are made, in
light of the circumstances under which they are made, not misleading.

          19.  Survival -
               --------  

          The representations and warranties of this article shall survive the
closing.

III. REPRESENTATIONS AND WARRANTIES OF NESCO

          NESCO hereby represents and warrants to TET and the Shareholders as
follows:

          1.  Existence; Good Standing-
              ------------------------ 

          NESCO is a corporation duly incorporated, validly existing and in good
standing under the laws of the State of Oklahoma.  NESCO is duly licensed or
qualified to do business as a foreign corporation and is in good standing under
the laws of all other jurisdictions (i) in which the character of the properties
owned or leased by it therein or in which the transaction of its business makes
such qualification necessary, or (ii) the failure to be so qualified would not
have material adverse effect on NESCO.

          2.  Authorization; Validity and Effect of Agreements -
              ------------------------------------------------- 

          The execution and delivery of this Agreement and all agreements
contemplated hereby by NESCO and the consummation by it of the transactionshave
been duly authorized by all requisite corporate actions necessary to become a
binding and enforceable obligation of NESCO.  This agreement will constitute,
and all agreements and documents to be executed and delivered under this
Agreement by NESCO, when so executed and delivered for value received, 

                                       13
<PAGE>
 
will constitute the valid and legally binding obligations of NESCO enforceable
in accordance with its terms. The execution and delivery of this agreement does
not and the consummation of the transactions contemplated hereby will not (a)
result in the breach of any term or provision of, or constitute a default under,
or result in the acceleration of or entitle any party to accelerate any
obligation under, or result in the creation or imposition of any lien upon any
part of the property of NESCO pursuant to any provision of any order, judgement,
arbitration award, injunction, decree, indenture, mortgage, lease, license,
lien, or other agreement or instrument to which NESCO is a party or by which
either of them is bound, or (b) violate or conflict with any provision of the
bylaws or certificate of incorporation of NESCO.

          3.  Brokers -
              ------- 

          NESCO has not entered into any contract, arrangement or understanding
with any person or firm which may result in the obligation of the Shareholders
or TET to pay any finder's fees, brokerage or agent's commissions or other like
payments in connection with the negotiations leading to this Agreement or the
consummation of the transactions contemplated hereby.

          4.  No Misrepresentation or Omission -
              --------------------------------  

          No representation or warranty by NESCO in this Article or any other
Article or Section of this Agreement, or in any certificate or other document
furnished or to be furnished by NESCO pursuant hereto, contains or will contain
any untrue statement of a material fact or omits or will omit to state a
material fact necessary in order to provide TET and Shareholders with accurate
information as to NESCO.

          5.  Survival -
              --------  

          The representations and warranties of this article shall survive the
closing.


IV. OTHER COVENANTS OF THE PARTIES

          1.  Access to Personnel, Books and Records and Properties -
              -----------------------------------------------------  

          At all times prior to the consummation of the Transaction, TET shall
afford NESCO and its representatives, agents, independent auditors, and
employees full 

                                       14
<PAGE>
 
access to the personnel, books and records, tangible assets, agreements, and
licenses of TET as may be reasonably requested by NESCO or its representatives,
agents, or employees. TET agrees that prior to closing the Transaction, NESCO
will be furnished with such accounting information and reports to the extent
NESCO deems reasonably necessary to enable NESCO to perform its public reporting
obligations and to satisfy the disclosure requirements under the rules and
regulations of the Securities and Exchange Commission.

     2.   Independent Audit and Review -
          ----------------------------  

     NESCO shall arrange, at NESCO's sole cost and expense, to have an
independent audit performed on the financial statements at and for the period or
periods ended December 31, 1998, of TET, and an independent review of the
financial statements at and for the period ended April 30, 1999.  After closing
of the acquisition of the assets of TET, Shareholders will, without
compensation, make themselves reasonably available to the independent auditors
for questions with regard to the audit and review and to make all reasonable
warranties and representations which shall not be deemed unreasonable by
Generally Accepted Auditing Standards, as required for the proper completion of
the audit and review report.  It is understood that the independent audit and
review may not be completed prior to the closing of the acquisition of the
assets of TET.  Such non-completion of the audit and review shall not cause the
closing of the purchase of the assets to be delayed beyond the closing date.
Notwithstanding anything contained herein, TET and the Shareholders shall have
sixty (60) days after receipt from NESCO of such audited and reviewed financial
statements to conduct a review thereof and to notify NESCO in writing of any
objection TET or the Shareholders may have with respect thereto.  NESCO, at
NESCO's sole expense, shall make available to TET and the Shareholders (and to
the TET's outside accounting firm ("TET's Firm"), if requested) the former
personnel, books and records of TET to assist TET in reviewing such audited and
reviewed financial statements. If TET fails to raise any written objection
within such sixty (60) day period, the audited and reviewed financial statements
shall thereinafter be deemed to be final and conclusive.  If TET does raise any
written objection within such time ("TET's Objections"), representatives of TET
and NESCO shall meet in good faith over a period of the next twenty (20) days,
which meetings may include representatives of NESCO's outside accounting firm
("Buyer's Firm") and the TET's Firm, to attempt to resolve all of the TET's
Objections, and to agree upon the final and conclusive audited and reviewed
financial statements of TET.  That portion of the $600,000 retainage described
in Article I, Section 5, of this 

                                       15
<PAGE>
 
Agreement, which has not been adjusted due to the independent audit and review
of the financial statements described above, shall be paid in accordance with
the provisions of Article 1, Section 5, of this Agreement. TET and NESCO shall
cooperate in the review of the preliminary audited and reviewed financial
statements and in the resolution of TET's Objections, if any, and to such end
shall make available to the other and to the other's representatives on a timely
basis all information, records, data, internal and outside auditor's and
accountants' work papers as may be reasonably requested. If the parties are
unable to agree upon such final audited and reviewed financial statements, TET
and NESCO shall, not later than ten (10) days thereafter, jointly engage an
independent accounting firm (which shall not be the regular auditing firm of TET
or NESCO) (the "Arbiter") selected by them, or if they are unable to agree,
selected by the respective engagement partners of each of Buyer's Firm and TET's
Firm, to review the TET's Objections. Each of TET and NESCO shall be permitted
to submit oral and written testimony and documentation to the Arbiter in an
informal hearing not to last more than two (2) business days and to be held
within sixty (60) days of the Arbiter's engagement. The Arbiter shall resolve
all of the TET's Objections in a written report to each of TET and NESCO, which
report shall include the final and conclusive financial statement of TET and a
reconciliation statement showing the adjustments made by the Arbiter from the
financial statements of TET set forth above, and which report shall be finally
and conclusively binding on the parties and not subject to further resolution.
If NESCO owes TET money following a mutual agreement between NESCO and TET or
pursuant to Arbiters final decision, said sum shall be paid within 10 days
following NESCO's agreement or receipt of the Arbiters report. All adjustments
in favor of TET shall be offset, dollar for dollar, by any adjustments in favor
of NESCO. However, adjustments to the TET financial statements set forth above
shall not be greater than the amount of adjustments as originally determined by
the audit and review performed by NESCO's independent auditors. All fees and
expenses (A) of Buyer's Firm shall be paid by NESCO, (B) of TET's Firm shall be
paid by TET, and (c) of the Arbiter shall be paid one-half by TET and one-half
by NESCO.

     3.  Confidentiality -
         ---------------  

     Each party shall keep confidential any information with respect to the
other party that is not otherwise generally available to the public or has been
made available to the public by persons other than such party, its
representatives, agents, or employees without breach of this Definitive
Agreement or a similar confidentiality agreement, except as required by
applicable law or stock exchange 

                                       16
<PAGE>
 
rules. If for any reason the transaction is abandoned or terminated prior to
being consummated, each party will return promptly all information containing
confidential or proprietary information disclosed to the other party.

     4.  Publicity -
         ---------  

     Except as may be required of NESCO by applicable law or securities laws and
rules, neither party hereto shall make any public announcement or any press
release regarding this proposal or the transaction or the subject matter hereof
or thereof without the prior consent of the other party; provided, however,
notwithstanding anything contained herein to the contrary, the parties hereto
acknowledge and agree that no party prior to the Closing of the Transactions
contemplated herein shall disclose to any person or entity, other than such
party's employees and legal, accounting and financial advisors, or board of
directors, this Definitive Agreement or the subject matter hereof for any reason
without the prior written consent of the other parties hereto which may be
withheld for any or no reason.

     5.  Contingency -
         -----------  

     The closing of this Definitive Agreement will be conditioned upon, among
other things,  (i) arrangements reasonably satisfactory to NESCO concerning the
continued employment following consummation of the Transaction of Richard
Andrews, (ii) all necessary governmental approvals having been obtained, (iii)
all necessary debt holder or other contractual consents having been obtained,
(iv) replacement or transfer of surety bonds by NESCO as of the closing date
sufficient to relieve TET and Shareholders of any liability that may be incurred
under the bonds, (v) assignment and transfer of all permits except those listed
at Schedule 4.

     6.  Expenses -
         --------  

     Each party hereto will separately bear its own expenses incurred in
connection with this proposal and the transaction, regardless of whether the
transaction is consummated.

     7.  Brokers -
         -------  

     Should TET or Shareholders have entered into a contract, arrangement, or
understanding with any person or firm which may result in the obligation for the

                                       17
<PAGE>
 
payment of a finder's fee, brokerage or agent's commission, or other like
payments in connection with the negotiations leading to this Agreement or the
consummation of the transactions contemplated hereby, it is understood and
agreed that said obligations shall be the sole responsibility of TET and/or
Shareholders and that NESCO shall not be obligated to pay any such fee,
commission, or like payment.

          8. Interim Operations -
             ------------------  

          Shareholders and TET shall continue to operate  in a manner that will
maintain TET's value, customers, reputation, and goodwill during the time period
between the acceptance of this proposal and closing date.  Pending execution of
the Agreement (or termination of this proposal), Shareholders and TET agree that
they will conduct its business only in the ordinary course and not engage in any
extraordinary transaction without NESCO's prior consent.  TET agrees that, prior
to Closing Date of the transaction, there will be no disposal of any asset with
a value greater than $1,000.

          9. Non-Compete Agreements -
             ----------------------  

          Shareholders agree to execute and deliver to NESCO at closing a Non-
Compete Agreement with a term of two (2) years, said agreement to be
substantially in the form attached hereto as Exhibit D.

          10. Shareholder Approval -
              --------------------  

          Prior to the Closing, the Shareholders shall take all actions required
under the laws of the State of South Carolina to consent to and approve the
transaction and the other transactions contemplated by this Agreement.

V.   SURVIVAL AND INDEMNIFICATION

          1. Survival -
             --------  

          Notwithstanding anything contained herein to the contrary, the
covenants and agreements of the parties, expressed in Article IV: Section 3.
Confidentiality, Section 4. Publicity, Section 6. Expenses, and Section 7.
Brokers, shall be binding regardless of whether or not the closing of
Transactions set forth in this Definitive Agreement is consummated.

                                      18
<PAGE>
 
     2.  Indemnification -
         ---------------  

               A. Indemnity Damages - For purposes hereof , the term
"IndemnityDamages" shall mean all losses, damages, liabilities, claims, suits,
demands, penalties, assessments, remedial costs, fines, obligations, causes of
action, expenses, or costs (including litigation expenses and reasonable
attorney fees) with respect to which an indemnification right applies hereunder.

               B. General Indemnity - TET and Shareholders shall indemnify and
hold NESCO and NESCO's agents harmless, and NESCO shall indemnify and hold TET
and each Shareholder and their respective agents harmless, from any and all
Indemnity Damages asserted against or incurred by the indemnified party as a
result of any breach of a representation, warranty, covenant, or agreement, made
by such indemnifying party herein or in agreements to be delivered at Closing
hereunder.

               C. Special Indemnities -

                    (i)  TET and Shareholders shall indemnify and hold NESCO and
NESCO's agents harmless from any and all Indemnity Damages asserted against or
incurred by the indemnified party which relate to the business of TET and which
arise or accrue on or before the date of Closing; provided however, TET and the
Shareholders shall not be required to indemnify or hold harmless NESCO or
NESCO's agents for any Indemnity Damages related in any way to or arising out of
(a) any liability of TET specifically assumed by NESCO hereunder, and/or (b) any
project, contract, agreement, or work-in-progress of TET which is to be
completed or performed, in whole or in part, by NESCO or any of its agents after
the date of Closing as set forth on Schedule 2 attached hereto. However, this
exemption from indemnity shall not apply to the actions of TET which are wholly
unrelated to the planning, design, and performance of the remediation projects
as set forth in Schedule 2.

                    (ii) NESCO shall indemnify and hold TET and each of the
Shareholders and their respective agents (collectively the "TET Indemnitees")
harmless of and from any and all Indemnity Damages asserted against or incurred
by the indemnified party that relate in any way to NESCO, the assets purchased
hereunder and /or the liabilities assumed hereunder by NESCO that arise or
accrue after the date of closing. Said indemnification of TET and Shareholders
by NESCO shall include any claims asserted against TET for non-

                                       19
<PAGE>
 
payment of liabilities assumed by NESCO.

               D.   Provisions of General Application - With respect to any
right of indemnification arising under this Definitive Agreement, the following
provisions shall apply:

                    (i)   Procedures - The indemnified party and the
indemnifying party agree to cooperate in the defense of any third party claim or
action subject to this Section, to permit the cooperation and participation of
the other parties in any such claim or action, and to promptly notify the other
parties of the occurrence of any indemnified event or any material developments
or amounts due respecting any indemnification event.

                    (ii)  No Implications - Neither the rights of any party to
indemnification from another party nor the obligations of any party to indemnify
another party, under this Definitive Agreement shall in any way imply or create,
and each party specifically disclaims, any responsibility whatsoever by such
party for any other party's liabilities to any other person or entity or
governmental body.

                    (iii) Settlement - No settlement of an action covered by
this Section shall be made without the prior written consent of each party to
this Definitive Agreement, which consent shall not be unreasonably withheld;
provided however, that anything in this Definitive Agreement to the contrary
notwithstanding, (a) if there is a reasonable probability that a claim may
materially and adversely affect an indemnifying party other than as a result of
money damages or other money payments, the indemnifying party shall have the
right, at its own cost and expense, to compromise or settle such claim in any
reasonable manner, but (b) the indemnifying party shall not, without prior
written consent of the indemnified party, settle or compromise any claim or
consent to the entry of any judgment which does not include as an unconditional
term thereof the giving by the claimant or the plaintiff to the indemnified
party a release from all liability in respect of such claim.

                    (iv)  Insurance - In connection with enforcing any claim for
indemnification against the indemnifying parties under this Definitive
Agreement, the indemnified parties shall administratively file in good faith
with any insurers all forms and submissions required by applicable policies for
the proceeds or other benefits of insurance coverage, if any, applicable to the
claim

                                       20
<PAGE>
 
or event from which such indemnification right arose. In the event that
insurance proceeds are paid to the indemnified parties respecting an event to
which an indemnification right applied hereunder, such indemnification right
shall apply only to the extent that the amount of damages indemnified against
exceeds such insurance proceeds actually paid to the indemnified parties. If the
indemnifying parties incur indemnity costs or pay indemnity damages under this
Definitive Agreement, and the indemnified parties subsequently receive insurance
proceeds for the same claim or event, then the indemnified parties shall refund
such indemnity costs or damage payments to the indemnifying parties from such
insurance proceeds to the extent that the indemnified party has received
benefits from both sources (i.e., payments of indemnity damages from the
indemnifying party and such insurance proceeds) in excess of the amount of
indemnity damages incurred by or asserted against the indemnified parties.

                    (v)  Mitigation - The indemnified parties agree that the
indemnifying party's liability for indemnification, if any shall be reduced to
the extent that a claim or loss by a third party could reasonably have been
mitigated by the indemnified party and the indemnified party failed to act
reasonably and in good faith to do so.

                    (vi) Notice and Cooperation - If any action, suit,
proceeding, claim, liability, demand or assessment is asserted against an
indemnified party in respect of which such indemnified party proposes to demand
indemnification, such indemnified party shall notify the indemnifying parties
thereof promptly and within a reasonable time after assertion thereof, and such
notice shall include copies of all suits, service, and claim documents, all
other relevant documents in possession of such indemnified party, and an
explanation of the indemnified party's contentions and defenses with reasonable
detail in light of the circumstances; provided however, that the indemnified
party's failure or delay in giving such notice shall not relieve the
indemnifying parties of their obligations under this Section to the extent the
                                                     -------
party shall have demonstrated that: (a) it acted in good faith and without
unreasonable delay; and (b) the indemnifying parties shall not have been
prejudiced thereby. The parties agree to cooperate fully with each other, and in
connection with the mitigation, defense, negotiation or settlement of any such
legal proceeding, claim or demand, and in any event, all parties shall retain
the right to participate in the defense of any such legal proceeding, claim or
demand. Subject to rights of or duties to any insurer or other third person
having liability therefore, the indemnifying parties shall have the right within
thirty (30) days after receipt of the notice described above to assume the

                                      21
<PAGE>
 
control of the defense, compromise or settlement of any such action, suit,
proceeding, claim, liability, demand or assessment, including at its own
expense, employment of counsel; provided however, that if the indemnifying
parties shall have exercised their right to assume such control, the indemnified
party: (X) may, in its sole discretion and expense, employ counsel to represent
it (in addition to counsel employed by the indemnifying parties) in any such
matter, and in such event counsel selected by the indemnifying parties shall be
required to cooperate with such counsel of the indemnified party in such
defense, compromise or settlement for the purpose of informing and sharing
information with such indemnified party; and (Y) shall, at its own expense, make
available to the indemnifying parties those employees of the indemnified parties
and their affiliates whose assistance, testimony or presence is reasonably
deemed by the indemnifying parties necessary or beneficial to assist them in
evaluating and defending any such action, suit, proceeding, claim, liability,
demand or assessment; provided further, however, that any such access shall be
conducted in such a manner as not to interfere unreasonably with the operations
of the businesses of the indemnified parties. If the indemnified party employs
separate counsel and participates in the defense thereof, the indemnified party
will be responsible for the fees and expenses of such counsel. However, if the
indemnifying party (A) has failed to assume the defense of such claim or to
employ counsel with respect thereto or (B) a conflict of interest exists between
the interests of the indemnified party and the indemnifying party that requires
representation by separate counsel, the fees and expenses of such separate
counsel will be paid by the indemnifying party, and the indemnified party may
assume and control the defense of the claim; provided that the indemnified party
may not settle any such claim without the consent of the indemnifying party (not
to be unreasonably withheld); and further provided that the indemnifying party
is given a reasonable opportunity to participate in such defense (at the
indemnifying party's expense).

                    (vii)  Assignment - To the extent that the indemnifying
parties shall have actually paid indemnity damages to or on behalf of the
indemnified parties, the indemnified parties shall make a non-exclusive
assignment to the indemnifying parties (as their interests may appear) of the
remedies, rights, and claims, if any, of the indemnified parties against any and
all third parties for the same liability, including, but not limited to,
remedies, rights and claims against (a) liability insurers and other insurance
companies and (b) any other person which has indemnified the indemnified parties
for such liability. The parties shall cooperate reasonably in the pursuit of any
such remedies, rights, and claims.

                                      22
<PAGE>
 
                    (viii)  Limitations - No party hereto shall become liable
for any such indemnification claims under this Definitive Agreement or any
agreement executed in connection therewith unless and until the aggregate of all
such claims exceeds Five Thousand and No/100 Dollars ($5,000), and then only to
the extent of such excess over $5,000. Furthermore, notwithstanding anything
contained herein to the contrary, a Shareholder shall not be liable in the event
the other Shareholder (the "Other Shareholder") breaches, or threatens to
breach, the Non-Compete Agreement executed by the Other Shareholder as described
in Article VI, Section 9 above.

                    (ix)    Exclusive Remedies - Anything contained in this
Definitive Agreement or any agreement executed in connection therewith to the
contrary notwithstanding, the indemnification rights set forth in this Article,
                                                                       -------
all of which are subject to the terms, limitations, and restrictions of this
Article, shall be the exclusive remedy after Closing for monetary damages
- -------
sustained as a result of a breach of a representation, warranty, covenant, or
agreement under this Definitive Agreement. Such limitations set forth in this
Article shall not impair the rights of any of the parties to seek non-monetary
- -------
equitable relief, including (without limitation) specific performance or
injunctive relief to redress any default or breach of this Definitive Agreement.

VI.  MISCELLANEOUS

     1. Closing Date -
        ------------  

     The closing date shall be on or before May 7, 1999.  The Effective Date of
the transaction will be April 30, 1999 or at Closing if earlier.

     2. Term of Agreement -
        -----------------  

     If not executed by Shareholders, this Agreement shall expire at 5:00 PM
EDST, Tuesday, May 4, 1999.

     3. Termination -
        -----------  

     This Definitive Agreement may be terminated by any party hereto for any or
no reason, without liability to other parties hereto, in the event closing does
not occur by May 30, 1999.

                                      23
<PAGE>
 
     4. Modifications -
        -------------  

     This Definitive Agreement can only be modified by a written agreement duly
signed by authorized representatives of the parties hereto.  Moreover, in order
to avoid uncertainty, ambiguity and misunderstandings in their relationships,
the parties hereto covenant and agree not to enter into any oral agreement or
understanding inconsistent or in conflict with this Definitive Agreement.

     5. Assignments -
        -----------  

     Neither this Definitive Agreement nor any rights hereunder may be assigned
or otherwise transferred by either party without the prior written consent of
the other parties hereto.

     6. Time of Essence -
        ---------------  

     The parties acknowledge and agree that time is of the essence in the
performance of this Definitive Agreement.

     7. Cumulative Remedies -
        -------------------  

     All rights and remedies of a party hereunder shall be cumulative and in
addition to such rights and remedies as may be available to a party at law or
equity.

     8. Venue and Jurisdiction -
        ----------------------  

     The parties hereto hereby (i) agree that any litigation, action or
proceeding arising out of or relating to this definitive Agreement may be
instituted in a state or federal court in the City and State of Columbia, South
Carolina, (ii) waive any objection which it might have now or hereafter to any
such litigation, action or proceeding based upon improper venue or inconvenient
forum, and (iii) irrevocably submit to the jurisdiction of such courts in any
such litigation, action or proceeding.

     9. Entire Agreement -
        ----------------  

     This Definitive Agreement constitutes the entire agreement between the
parties with respect to the subject matter hereof and supersedes all prior or

                                       24
<PAGE>
 
contemporaneous written or oral agreements and representations between the
parties with respect thereto.

     10.  Notices -
          -------  

     Any notice, request, approval, consent, demand or other communication shall
be effective upon the first to occur of the following: (i) upon receipt by the
party to whom such notice, request, approval, consent demand or other

communication is being given; or (ii) three (3) business days after being duly
deposited in the United States mail, registered or certified, return receipt
requested, and addressed as follows:

          TET:       TET Environmental Services, Inc.
          ---                                     
                     1901 Boykin Road
                     Rembert, SC 29128
                     Attn:  William Wimberly

          NESCO:     National Environmental Service Company
          -----                                         
                     12331 East 60/th/ Street
                     Tulsa, OK 74l46
                     Attn:  Eddy Patterson

          O'Brien:   Mr. Harry D. O'Brien
          -------                       
                     6 Retreat Lane
                     Columbia, SC 29209

          Wimberly:  Mr. William Wimberly
          --------                       
                     1901 Boykin Road
                     Rembert, SC 29128

     The parties hereto may change their respective addresses by notice in
writing given to the other party to this Agreement.

     11. Severability -
         ------------  

     If any provision or provisions of this Definitive Agreement shall be held
to be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

                                       25
<PAGE>
 
     12.  Governing Law -
          -------------  

     The construction and interpretation of this Definitive Agreement shall at
all times and in all respects be governed by the laws of the State of South
Carolina.

     13.  Allocation of Purchase Price -
          ----------------------------  

     The parties hereto acknowledge and agree that the purchase price shall be
allocated, and the transactions reported on all tax returns, in accordance with
the terms of this Section.  The purchase price shall be allocated first to the
                  -------                                                     
tangible assets purchased hereunder in accordance with the Schedule 3 attached
hereto.

     14.  Attorney's Fees -
          ---------------  

     In the event litigation is commenced to enforce any rights under this
Definitive Agreement or to pursue any other remedy available to any party, all
legal expenses or other costs of litigation (including reasonable

attorney's fees) of the prevailing party shall be paid by the non-prevailing
party.

     If the foregoing is acceptable to you, please signify by signing this
letter in the space provided below and returning to me a copy bearing original
signatures.

                                        Sincerely,

                                        National Environmental Service Company

                                        _______________________________________
                                        Larry G. Johnson - Vice President &
                                                      Secretary-Treasurer

                                       26
<PAGE>
 
                                          AGREED AND ACCEPTED:                 
                                                  
                                          COMPANY:                             
                                                  
                                          TET Environmental Services, Inc.     
                                          
                                          _______________________________      
                                          William Wimberly - President         
                                          
                                          Attest:                              
                                          
                                          _______________________________      
                                          Secretary                            
                                          
                                          
                                          SHAREHOLDERS:                        
                                          _______________________________      
                                          William Wimberly - Shareholder       
                                          
                                          _______________________________      
                                          Harry D. O'Brien - Shareholder        

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