NDE ENVIRONMENTAL CORP
8-K, 1997-06-06
TESTING LABORATORIES
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<PAGE>
                       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 (Date of earliest event reported): May 22, 1997




                               Commission File No.
                                     1-10361



                          NDE ENVIRONMENTAL CORPORATION
             (Exact name of registrant as specified in its charter)




              Delaware                                     95-3634420
    (State or other jurisdiction of                      (IRS Employer
     incorporation or organization)                     Identification No.)

  8900 Shoal Creek Boulevard, Suite 200
            Austin, Texas                                    78757
(Address of principal executive offices)                   (Zip Code)

Registrant's telephone number, including area code:      (512) 451-6334




                                     Page 1


<PAGE>



                          NDE ENVIRONMENTAL CORPORATION

                                      INDEX



                                                                        Page (s)

ITEM 2.   Acquisition or Disposition of Assets.................................3

ITEM 7.   Financial Statements and Exhibits....................................3
            Unaudited Pro Forma Condensed Consolidated
               Balance Sheet...................................................5
            Unaudited Pro Forma Condensed Consolidated
               Statement of Operations.........................................6
            Notes to Unaudited Pro Forma Condensed
               Financial Information...........................................7

SIGNATURES.....................................................................8

Index to Exhibits..............................................................9




                                        2

<PAGE>



                          NDE ENVIRONMENTAL CORPORATION



ITEM 2.   Acquisition or Disposition of Assets

     On May 22, 1997 NDE Environmental  Corporation (NDE) (Bulletin Board, NDEC,
dba  Tanknology/   NDE),  a  leading   provider  of  underground   storage  tank
environmental  compliance  services  sold all of the capital stock of its USTMAN
Industries Inc. (USTMAN) subsidiary to Watson General Corporation (NASDAQ symbol
WGEN) for $5,750,000 plus other consideration described below.

     USTMAN  provides  Statistical  Inventory  Reconciliation  services  for the
monitoring  of  underground  storage  tanks and was purchased in October 1996 as
part of the  acquisition  of Tanknology  Corporation  International,  USTMAN and
Tanknology Canada (1988), Inc.  (Collectively the "UST Group of Companies") from
TEI Incorporated (formerly Tanknology Environmental International).

     The sale price  included a cash payment at closing of $5,250,000  and an 8%
note for  $500,000  (the  "Note")  due in one  year.  All cash on hand at USTMAN
immediately  prior to the closing of the  transaction  was also  retained by the
Company.  The sale agreement also provides for a further payment to NDE relating
to a post-closing adjustment based upon certain working capital calculations. As
a condition of approval of the sale transaction by the Company's senior bank and
senior subordinated debt holder,  three million dollars ($3,000,000) of the cash
proceeds will be placed in a restricted  account with the Company's  senior bank
and will be held as  collateral  against  outstanding  loans  until the  Company
identifies appropriate investment  opportunities.  The Note will also be pledged
to the bank and subordinated  debt holder as collateral.  The remaining net cash
proceeds  (after  transaction  expenses) will be used to pay down debt under the
Company's  revolving  credit line.  The Company can reborrow funds on the credit
line any time.

     The excess of the net proceeds of the transaction  over the Company's basis
in USTMAN will be treated,  for  accounting  purposes,  as an  adjustment to the
purchase price of the October 1996  acquisition  and accordingly be applied as a
reduction to goodwill and other intangibles.


ITEM 7.   Financial Statements and Exhibits

     (b)  Pro Forma Financial Information

          The following  unaudited pro forma  condensed  consolidated  financial
     statements  set forth the results of operations for the year ended December
     31, 1996 and the three months ended March 31, 1997 as if the disposition of
     USTMAN and the sale of the operations of Tanknology Canada (1988), Inc. (as
     reported in Form 8-K dated February 20, 1997) occurred on October 25, 1996,
     the  date  upon  which  both  were  acquired  as part of the UST  Group  of
     Companies.  The pro forma  condensed  consolidated  balance sheet presented
     gives effect to the  disposition if it had occurred as of the balance sheet
     date, March 31, 1997.

          The  pro-forma  information  is based  upon the  historical  financial
     statements of the Company and all material adjustments necessary to be made
     to the historical financial statements to reflect these assumptions.

          The  pro  forma  financial   information   presented   herein  is  not
     necessarily indicative of the results that actually would have occurred had
     the sales been effected on the dates and for the periods  indicated or that
     may be obtained in the future.  The pro forma financial  information should
     be read in  conjunction  with  the  Financial  Statements  included  in the
     Company's  Form 10-KSB/A for the fiscal year ended December 31, 1996 and in
     Item 1 of the Company's Form 10-Q for the quarter ended March 31, 1997.


                                        3

<PAGE>



                          NDE ENVIRONMENTAL CORPORATION


     (c)  Exhibits

     Stock Purchase  Agreement dated May 22, 1997 between the Company and Watson
     General Corporation.

     Press Release dated May 27, 1997,  announcing the completion by the Company
     of the sale of USTMAN.

     Amendment No. 2 to Loan Agreement dated May 20, 1997 between the Company 
     and Bank One, Texas, N.A.

     Notice of Final Agreement between the Company and Bank One, Texas, N.A. 
     with an effective date of May 20, 1997

     Pledge of Certificate of Deposit between the Company and Bank One,  Texas, 
     N.A. with an effective date of May 20, 1997

     Assignment of Promissory Note between the Company and Bank One, Texas, N.A.
     with an effective date of May 20, 1997

     Consent and Agreement dated and effective May 20, 1997 between the Company 
     and Bank One, Texas, N.A.

     Consent and  Agreement dated and effective May 20, 1997  between  the 
     Company and Banc One Capital Partners L.P.





                                        4

<PAGE>



                          NDE ENVIRONMENTAL CORPORATION


                 NDE Environmental Corporation and Subsidiaries
            Unaudited Pro Forma Condensed Consolidated Balance Sheet
                              as of March 31, 1997

<TABLE>
<CAPTION>

                                                                                          Pro Forma
                                                                       March 31, 1997    Adjustments         Pro Forma
                                                                       ----------------------------------------------------------
ASSETS                                                                  (Unaudited)                         (Unaudited)
<S>                                                                    <C>              <C>                <C>         
     Cash and restricted cash .......................................  $    1,031,652   $ 2,887,650   b    $  3,919,302
     Accounts receivable, net .......................................       6,680,397      (907,974)  a       5,772,423
     Inventories ....................................................         466,153          --               466,153
     Prepaid expenses and other current assets ......................         962,825       751,847   a,b     1,714,672
                                                                       --------------   -------------      --------------
Total Current Assets ................................................       9,141,027     2,731,523          11,872,550

Equipment and improvements, net .....................................       5,317,615      (458,310)  a       4,859,305

Intangible Assets

     Goodwill .......................................................       4,845,107    (4,832,741)  e          12,366
     Intangible assets, .............................................       1,985,090       (83,923)  a       1,901,167
     Deferred  financing costs ......................................         866,939          --               866,939
                                                                       --------------   -------------      --------------
Total assets ........................................................  $   22,155,778   $(2,643,451)       $ 19,512,327
                                                                       ==============   =============      ==============

Liabilities and Stockholder's Equity

     Accounts payable ...............................................  $    1,775,724   $   (75,931)       $  1,699,793
     Accrued liabilities ............................................       3,607,728      (317,520)  a       3,290,208
     Accrued payroll and payroll taxes ..............................       1,645,859          --             1,645,859
     Current portion of long-term debt ..............................       2,272,223          --             2,272,223
                                                                       --------------   -------------      --------------
Total Current Liabilities ...........................................       9,301,534      (393,451)          8,908,083
                                                                       --------------   -------------      --------------

     Long Term Debt, less Current Portion ...........................      12,880,416    (2,250,000)  b      10,630,416

     Warrants with put option .......................................       1,800,250          --             1,800,250

                                                                       --------------   -------------      --------------
Total  Liabilities .................................................. $    23,982,200   $(2,643,451)       $ 21,338,749
                                                                       ==============   =============      ==============

Stockholders' Deficit

     Series AAA Convertible Preferred Stock, $.0001  par value ......           5,000          --                 5,000
     Common stock, $.0001 par value .................................           1,598          --                 1,598
     Additional paid-in capital .....................................      27,578,446          --            27,578,446
     Accumulated deficit ............................................     (29,382,700)         --           (29,382,700)
     Cumulative foreign currency translation adjustment .............         (28,766)         --               (28,766)
                                                                       --------------   -------------      --------------
Total Stockholders' Deficit .........................................      (1,826,422)         --            (1,826,422)

                                                                       --------------   -------------      --------------
Total liabilities and stockholders' deficit .........................      22,155,778    (2,643,451)         19,512,327
                                                                       ==============   =============      ==============
<FN>
The  accompanying  notes  are an  integral  part  of  the  pro  forma  condensed
consolidated financial statements.
</FN>
</TABLE>

                                        5

<PAGE>



                          NDE ENVIRONMENTAL CORPORATION


                 NDE Environmental Corporation and Subsidiaries
       Unaudited Pro Forma Condensed Consolidated Statement of Operations



<TABLE>
<CAPTION>
                                             Twelve Months Ended December 31, 1996            Three Months Ended March 31, 1997
                                          -------------------------------------------    -------------------------------------------
                                                              (c)                                           (d)
                                                           Pro Forma                                      Pro Forma
                                          Consolidated    Adjustments     Pro-Forma      Consolidated    Adjustments     Pro-Forma
                                          -------------  -------------  -------------    -------------  -------------  -------------
<S>                                       <C>            <C>            <C>              <C>            <C>            <C>         
Revenues ..............................   $ 15,939,126   $   (951,661)  $ 14,987,465     $  7,462,643   $ (1,567,452)  $  5,895,191

Cost of testing services ..............     11,085,062       (611,169)    10,473,893        5,602,108       (945,761)     4,656,347
                                          -------------  -------------  -------------    -------------  -------------  -------------

Gross Margin ..........................      4,854,064       (340,492)     4,513,572        1,860,535       (621,691)     1,238,844

Selling, general and
administrative ........................      6,581,337       (174,328)     6,407,009        2,045,144       (143,495)     1,901,649

Impairment of long-lived assets .......       (833,321)          --         (833,321)            --             --             --
                                          -------------  -------------  -------------    -------------  -------------  -------------

Operating loss ........................     (2,560,594)      (166,164)    (2,726,758)        (184,609)      (478,196)      (662,805)

Other income (expense):

 Interest expense .....................     (1,062,409)        34,000     (1,028,409)        (845,146)        39,664       (805,482)

 Other income, net ....................        214,641           --          214,641             --             --             --
                                          -------------  -------------  -------------    -------------  -------------  -------------

Net loss before income taxes and
extraordinary gain ....................     (3,408,362)     (132,164)     (3,540,526)     (1,029,755)       (438,532)    (1,468,287)

Provision for income taxes ............        (43,785)       43,785            --               --             --             --

Extraordinary gain ....................      1,813,149           --        1,813,149             --             --             --
                                          -------------  -------------  -------------    -------------  -------------  -------------

Net loss ..............................   $ (1,638,998)  $    (88,379)  $ (1,727,377)    $ (1,029,755)  $   (438,532)  $ (1,468,287)
                                          =============  =============  =============    =============  =============  =============

Net loss per common share:

  Before extraordinary gain ...........   $      (0.45)  $      (0.01)  $      (0.46)    $      (0.06)  $      (0.03)  $      (0.09)
  Extraordinary gain ..................           0.24           0.00           0.24             0.00           0.00           --
                                          -------------  -------------  -------------    -------------  -------------  -------------
Net loss per  common share ............   $      (0.21)  $      (0.01)  $      (0.22)    $      (0.06)  $      (0.03)  $      (0.09)
                                          =============  =============  =============    =============  =============  =============

Weighted average common
shares outstanding ....................      7,725,377      7,725,377      7,725,377       15,978,610     15,978,610     15,978,610
                                          =============  =============  =============    =============  =============  =============

<FN>
The  accompanying  notes  are an  integral  part  of  the  pro  forma  condensed
consolidated financial statements
</FN>
</TABLE>






                                        6

<PAGE>



                          NDE ENVIRONMENTAL CORPORATION


Notes to Unaudited Pro Forma Condensed Financial Information


     a    Adjustment  to eliminate the assets and  liabilities  of USTMAN in the
          Company's  consolidated  balance sheet as of March 31, 1997 which were
          sold to Watson General Corporation.

     b    Adjustment to reflect the proceeds and the application thereof against
          long-term debt from the sale of USTMAN.

     c    Adjustment to eliminate the operations of USTMAN and Tanknology Canada
          (1988), Inc. for the twelve-month period ended December 31, 1996. and
          interest expense on debt for the period from October 25, 1996 to
          December 31, 1996.

     d    Adjustment to eliminate the operations of USTMAN and Tanknology Canada
          (1988), Inc. and interest expense on debt for the three-month period
          ended March 31, 1997.

     e    Adjustment to eliminate goodwill  originally  recorded in October 1996
          in connection with the acquisition of the UST Group of Companies.  The
          amount eliminated represents the amount by which the proceeds from the
          sale of USTMAN exceeded the net assets sold, other than goodwill.



                                        7

<PAGE>



                          NDE ENVIRONMENTAL CORPORATION


                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has  duly  caused  this  report  to be  signed  by the  undersigned,
thereunto duly authorized.





                                          NDE ENVIRONMENTAL CORPORATION

Date:     June 6, 1997                    By:       /s/ DAVID G. OSOWSKI
     -----------------------                  ----------------------------------
                                              David G. Osowski
                                              Vice President and
                                              Chief Financial Officer
                                              PRINCIPAL ACCOUNTING OFFICER






                                        8

<PAGE>



                          NDE ENVIRONMENTAL CORPORATION



Index to Exhibits


 Exhibit
  Number       Exhibit
- ----------   -------------------------------------------------------------------

   2.1       Stock  Purchase  Agreement  dated May 22, 1997  between the
             Company and Watson General Corporation.

   99.1      Press Release dated May 27, 1997, announcing the completion by
             the Company of the sale of USTMAN.

   99.2      Amendment No. 2 to Loan Agreement dated May 20, 1997 between the 
             Company and Bank One, Texas, N.A.

   99.3      Notice of Final Agreement between the Company and Bank One, Texas, 
             N.A. Pledge of Certificate of Deposit between the Company and Bank 
             One, Texas, N.A. with an effective date of May 20, 1997

   99.4      Pledge of Certificate of Deposit between the Company and Bank One, 
             Texas, N.A. with an effective date of May 20, 1997

   99.5      Assignment of Promissory Note between the Company and Bank One, 
             Texas, N.A. with an effective date of May 20, 1997

   99.6      Consent and Agreement dated and effective May 20, 1997 between the 
             Company and Bank One, Texas, N.A.

   99.7      Consent and Agreement dated and effective May 20, 1997 between the 
             Company and Banc One Capital Partners L.P.






                                        9

                                                                     Exhibit 2.1



                            STOCK PURCHASE AGREEMENT



                                     between



                           WATSON GENERAL CORPORATION

                                    as Buyer



                                       and



                          NDE ENVIRONMENTAL CORPORATION

                                    as Seller





                            Dated as of May 22, 1997





<PAGE>


<TABLE>
<CAPTION>

                                TABLE OF CONTENTS
                                                                                       Page

<S>              <C>              <C>                                                   <C>
ARTICLE I        Definitions..............................................................1

ARTICLE II       Purchase and Sale........................................................5
                 Section 2.1      The Sale................................................5
                 Section 2.2      Purchase Price..........................................5
                 Section 2.3      Note and Subsidiary Guarantees..........................5
                 Section 2.4      Post Closing Adjustment.................................6
                 Section 2.5      Transactions Prior to Closing...........................8

ARTICLE III      Closing..................................................................9

ARTICLE IV       Representations and Warranties of Seller................................10
                 Section 4.1      Organization and Good Standing of the Company..........10
                 Section 4.2      Corporate Records......................................10
                 Section 4.3      Authorization..........................................11
                 Section 4.4      Non-Contravention......................................11
                 Section 4.5      Validity...............................................11
                 Section 4.6      Broker Involvement.....................................12
                 Section 4.7      Litigation.............................................12
                 Section 4.8      Title to Shares........................................12
                 Section 4.9      Contracts and Commitments..............................12
                 Section 4.10     Taxes..................................................13
                 Section 4.11     Title to Properties....................................15
                 Section 4.12     Trademarks, Trade Names and Intellectual Property......15
                 Section 4.13     Financial Records; Budget..............................16
                 Section 4.14     Condition of Assets and Inventory......................16
                 Section 4.15     Liabilities............................................16
                 Section 4.16     Employees and Related Matters..........................17
                 Section 4.17     No Material Change.....................................17
                 Section 4.18     Compliance With Law....................................18
                 Section 4.19     Tangible Personal Property.............................18
                 Section 4.20     Insurance..............................................18
                 Section 4.21     Government Licenses, Permits and Related Approvals.....18
                 Section 4.22     Distributed Products...................................18
                 Section 4.23     Safety Reports.........................................19
                 Section 4.24     Transactions with Certain Persons......................19
                 Section 4.25     Accounts Receivable....................................20
                 Section 4.26     Studies, Etc...........................................20
                 Section 4.27     Disclosure.............................................20
                 Section 4.28     Employee Benefits......................................21
                 Section 4.29     Environmental Matters..................................24
                 Section 4.30     Knowledge of Seller....................................25
                 Section 4.31     Conduct of the Business.  .............................25

                                            -2-


<PAGE>




ARTICLE V        Representations and Warranties of Buyer.................................27
                 Section 5.1      Corporate Status and Good Standing.....................27
                 Section 5.2      Authorization..........................................27
                 Section 5.3      Non-Contravention......................................28
                 Section 5.4      Validity...............................................28
                 Section 5.5      Broker Involvement.....................................29
                 Section 5.6      Litigation.............................................29
                 Section 5.7      Investment Intention...................................29
                 Section 5.8      Disclosure of Information..............................29
                 Section 5.9      Financial Condition....................................30
                 Section 5.10     Restricted Securities..................................30

ARTICLE VI       Additional Agreements and Covenants.....................................30
                 Section 6.1      Other Offers...........................................30
                 Section 6.2      Public Announcements...................................31
                 Section 6.3      Further Assurances.....................................31
                 Section 6.4      Covenant Against Competition...........................32
                 Section 6.5      Governmental Filings...................................35
                 Section 6.6      Access to Information..................................35
                 Section 6.7      Use of Name............................................35
                 Section 6.8      Other Action...........................................36
                 Section 6.9      Employee Benefit Matters...............................36
                 Section 6.10     Cooperation with Financings and Financial Reporting . .36
                 Section 6.11     Consents...............................................36
                 Section 6.12     Tax Certificate........................................37
                 Section 6.13     Certain Tax Elections..................................37
                 Section 6.14     Liability for Taxes....................................38
                 Section 6.15     Cooperation and Exchange of Information................40
                 Section 6.16     Conflict...............................................40
                 Section 6.17     Insurance..............................................41

ARTICLE VII      Extent and Survival of Representations, Warranties, 
                    Covenants and Agreements; Indemnification............................41
                 Section 7.1      Indemnification of Buyer...............................41
                 Section 7.2      Indemnification of Seller..............................43
                 Section 7.3      Survival...............................................44
                 Section 7.4      Indemnification Procedures.............................45
                 Section 7.5      Indemnification Procedures for Prior Period Claims. ...48
                 Section 7.6      Arbitration of Disputes................................50
                 Section 7.7      General................................................50

ARTICLE VIII     Conditions to Closing...................................................51
                 Section 8.1      Conditions Precedent to Obligations of Buyer...........51
                 Section 8.2      Conditions Precedent to Obligations of Seller..........52

                                            -3-


<PAGE>




ARTICLE IX       Actions to be Taken at Closing..........................................53
                 Section 9.1      Actions to be Taken by Seller at the Closing...........53
                 Section 9.2      Actions to be Taken by Buyer at the Closing............54

ARTICLE X        General Provisions......................................................55
                 Section 10.1     Termination............................................55
                 Section 10.2     Confidentiality; Publicity; Books and Records..........56
                 Section 10.3     Expenses...............................................58
                 Section 10.4     Entire Agreement.......................................58
                 Section 10.5     Waivers and Consents...................................58
                 Section 10.6     Notices................................................58
                 Section 10.7     Successors and Assigns.................................59
                 Section 10.8     Performance............................................59
                 Section 10.9     Choice of Law; Section Headings; Table of Contents.....59
                 Section 10.10    Counterparts...........................................59
                 Section 10.11    Jurisdiction and Venue.................................60
                 Section 10.12    Severability...........................................60
                 Section 10.13    Assignment.............................................60


                                            -4-


<PAGE>



SCHEDULES

Schedule 4.1     Foreign Qualifications
Schedule 4.4     Seller Non-Contravention
Schedule 4.7     Seller Litigation
Schedule 4.9     Contracts and Commitments
Schedule 4.10    Taxes
Schedule 4.11    Title to Properties
Schedule 4.12    Trademarks, Trade Names and Intellectual Property
Schedule 4.13    Financial Statements
Schedule 4.15    Liabilities
Schedule 4.16    Employees
Schedule 4.19    Tangible Personal Property
Schedule 4.20    Insurance Policies
Schedule 4.21    Permits
Schedule 4.22    Distributed Products
Schedule 4.23    Safety Reports
Schedule 4.24    Transactions with Certain Persons
Schedule 4.26    Studies
Schedule 4.28    Employee Benefit Plans
Schedule 4.29    Environmental Matters
Schedule 4.31    Changes to Employee Benefits
Schedule 5.3     Buyer Non-Contravention
Schedule 5.9     Financial Condition
Schedule 6.4     Noncompetition
</TABLE>



                                            -5-


<PAGE>




                            STOCK PURCHASE AGREEMENT

     This STOCK PURCHASE AGREEMENT (this "Agreement"), dated as of May 22, 1997,
is  entered  into  by and  between  Watson  General  Corporation,  a  California
corporation ("Buyer"), and NDE Environmental Corporation, a Delaware corporation
("Seller").

                              W I T N E S S E T H:

     WHEREAS,  Seller owns all of the  outstanding  capital stock  consisting of
1,000 shares of common stock  represented by share certificate no. 3 in the name
of Seller (the  "Shares")  of USTMAN  Industries,  Inc.  ("USTMAN"),  a Delaware
corporation  with its  principal  place of  business  at 12265 W.  Bayaud  Ave.,
Lakewood, CO 80225; and

     WHEREAS,  Buyer  desires to  acquire  the Shares  from  Seller,  and Seller
desires  to sell  the  Shares  to  Buyer,  upon the  terms  and  subject  to the
conditions hereinafter set forth;

     NOW,  THEREFORE,  in  consideration  of the premises and of the  respective
representations,  warranties,  covenants,  agreements and  conditions  contained
herein, the parties hereto hereby agree as follows:

                                    ARTICLE I
                                   Definitions

     The  terms  set  forth  below in this  Article  I shall  have the  meanings
ascribed to them below:

     Affiliate:  with respect to any person,  means any person that  directly or
indirectly  controls,  is  controlled  by or is under  common  control with such
person.

     Applicable  Law:  means any and all  federal,  national,  state,  regional,
local,  municipal or foreign laws,  statutes,  rules,  regulations,  guidelines,
ordinances,  licenses,  Permits or judicial or  administrative  decisions of any
country, or any political  subdivision,  agency,  commission,  official or court
thereof having jurisdiction over Seller or USTMAN.

     best  efforts:  means a  party's  efforts  in  accordance  with  reasonable
commercial practice and without the incurrence of unreasonable expense.

     Business: means all of the business and operations conducted by USTMAN.

     Code: means the United States Internal Revenue Code of 1986, as amended, or
any amending or superseding Tax laws of the United States.

     Environmental   Law:  means  any  applicable  law  (including  common  law)
regulating  or  prohibiting  Releases  into  any  part of the  workplace  or the
environment, or pertaining to the protection or improvement of natural resources

                                       -6-


<PAGE>



or  wildlife,  the   environment  or  public  and  employee  health  and  safety
including,  without  limitation,  the  Comprehensive   Environmental   Response,
Compensation,  and Liability Act ("CERCLA") (42  U.S.C.  Section  9601 et seq.),
the  Hazardous Materials  Transportation  Act (49 U.S.C. Section  1801 et seq.),
the Resource Conservation and Recovery Act (42 U.S.C. Section 6901 et seq.), the
Clean Water Act (33 U.S.C.  Section 1251 et seq.), the Clean  Air Act (42 U.S.C.
Section 7401 et seq.), the Toxic Substances Control Act (15 U.S.C. Section  7401
et seq.), the Atomic  Energy  Act of 1954  (42  U.S.C.  Section  2014 et  seq.),
the  Federal Insecticide,  Fungicide, and Rodenticide Act (7  U.S.C. Section 136
et seq.), the Occupational Safety and Health Act (29 U.S.C. Section 651 et seq.)
("OSHA")  and  the  regulations  promulgated  pursuant  thereto,  and  any  such
applicable state or  local statutes,  and  the regulations  promulgated pursuant
thereto, as such laws have been and may be amended or supplemented.

     Excluded Assets:  shall mean (a) all cash and cash equivalents of USTMAN at
Closing and (b) amounts owed to USTMAN by other Affiliates of Seller at Closing.

     Forms  8023-A:  means IRS Form 8023-A  (including  the  required  schedules
thereto) and any other form required to be filed with any  jurisdiction  so that
such jurisdiction will recognize the Section 338(h)(10) Election.

     Hazardous  Material:  means  any  substance,  material  or  waste  which is
regulated  pursuant  to any  Environmental  Law by any  public  or  governmental
authority in any  jurisdiction in which Seller or USTMAN conducts  business,  or
the United  States,  including,  without  limitation,  any material or substance
which is  defined  as a  "hazardous  waste,"  "hazardous  material,"  "hazardous
substance,"   "extremely   hazardous  waste,"   "restricted   hazardous  waste,"
"contaminant,"  "toxic waste," "toxic substance,"  "source  material,"  "special
nuclear  material,"  "byproduct  material,"  "high-  level  radioactive  waste,"
"low-level radioactive waste" or "spent nuclear material" under any provision of
Environmental Law.

     IRS: means the United States Internal Revenue Service.

     Lien: means any lien, pledge, claim, charge, security interest, mortgage or
other  encumbrance,  option or other  rights of any third  person of any  nature
whatsoever.

     Permit:  means  any and all  federal,  national,  state,  regional,  local,
municipal   or  foreign   licenses,   permits,   variances,   waivers,   riders,
registrations or any other governmental authorizations or approvals necessary or
appropriate for USTMAN to conduct its Business.

     person:  means any  individual,  firm,  corporation,  partnership,  limited
liability   company,   joint   venture,   association,   trust,   unincorporated
organization, government or agency or subdivision thereof or any other entity.

     Regulation:  means a United States Department of Treasury regulation issued
with respect to the Code.


                                       -7-


<PAGE>



     Release: means any release, spill, effluent,  emission,  leaking,  pumping,
pouring, emptying, escaping, dumping, injection,  deposit, disposal,  discharge,
dispersal, leaching or migration into the indoor or outdoor environment, or into
or out of any property currently or formerly owned, operated or leased by Seller
or USTMAN.

     Remedial Action:  means all actions,  including,  without  limitation,  any
capital  expenditures,  required by a governmental  entity or required under any
Environmental Law, or voluntarily  undertaken to (a) clean up, remove, treat, or
in any  other  way  ameliorate  or  address  any  Hazardous  Materials  or other
substance  in the indoor or outdoor  environment;  (b)  prevent  the  Release or
threat of Release,  or minimize the further Release of any Hazardous Material so
it does not  endanger or threaten to endanger  the public or employee  health or
welfare of the indoor or outdoor  environment;  (c) perform pre-remedial studies
and  investigations or post-remedial  monitoring and care pertaining or relating
to a  Release;  or (d) bring  the  applicable  party  into  compliance  with any
Environmental Law.

     Section  338(h)(10)  Election:  shall have the meaning set forth at Section
6.13.

     Taxes: means all United States federal,  state,  county and local,  foreign
and all other taxes,  charges,  fees,  levies or other  assessments,  including,
without limitation, all net income, gross income, gross receipts, sales, use, ad
valorem,  transfer,  franchise,  profits, profit share, license, lease, service,
service use, value added, withholding,  payroll, employment,  excise, estimated,
severance,  stamp,  occupation,  premium,  real and personal property,  windfall
profits, gains, capital stock, production, business and occupation,  disability,
custom duties or other taxes of any kind whatsoever, together with any interest,
penalties,  additions to tax, fines or other additional  amounts imposed thereon
or related thereto, and the term "Tax" means any one of the foregoing Taxes.

     Tax Certificate: shall have the meaning set forth at Section 6.12.

     Tax  Returns:  means all  United  States  federal,  local and state and all
foreign  returns,   declarations,   reports,  estimates,   information  returns,
statements  and other  documents  of,  relating  to, or  required to be filed in
respect of, any and all Taxes.

                                   ARTICLE II
                                Purchase and Sale

     Section 2.1 The Sale.  Upon the terms and subject to the conditions of this
Agreement, at the Closing, as defined below under Article III, Seller will sell,
assign, transfer and deliver the Shares to Buyer (together with a stock power or
powers  executed in blank),  and Buyer will purchase and acquire the Shares from
Seller.

     Section 2.2  Purchase  Price.  The  purchase  price for all the Shares (the
"Purchase  Price") shall be  $5,750,000.  The Purchase Price shall be subject to
adjustment  only  pursuant to Section 2.4.  The Purchase  Price shall be paid by
Buyer at Closing by (i) wire  transfer of $5,250,000  in  immediately  available
funds to an account or accounts  designated  in writing by Seller at Closing and
(ii) delivery of the Purchase Note to Seller as defined in Section 2.3.

                                       -8-


<PAGE>



     Section 2.3 Note and  Subsidiary  Guarantees.  At the Closing,  Buyer shall
deliver  to  Seller  an  unsecured  senior  note  validly  executed  by Buyer in
substantially the form attached hereto as Exhibit A (the "Purchase  Note").  The
Purchase Note shall be in the aggregate  principal  amount of $500,000 and shall
bear interest at a rate of 8.5% per annum.  Accrued  interest on the outstanding
principal  balance of the Purchase Note shall be payable  quarterly on September
1, 1997,  December 1, 1997 and March 1, 1998. The unpaid  principal  balance of,
and all  accrued  and unpaid  interest  on, the  Purchase  Note shall be due and
payable in full on June 1, 1998.  Immediately following the Closing, Buyer shall
cause USTMAN,  Watson Systems,  Inc., a Missouri  corporation and a wholly-owned
subsidiary  of  Buyer,  and  EnvirAlert,  Inc.,  a  Delaware  corporation  and a
wholly-owned  subsidiary of Buyer, to each execute the guaranty (the "Subsidiary
Guaranty") of Buyer's  obligations  under the Purchase Note in substantially the
form attached  hereto as Exhibit B. Seller hereby  recognizes  and  acknowledges
that, in connection with the transactions  described herein,  Buyer has obtained
certain acquisition  financing and that such financing may be secured by some or
all of the assets of Buyer and its subsidiaries at or after Closing.

     Section 2.4 Post Closing Adjustment.

          (a) Within 60 calendar days following the Closing, Buyer shall prepare
     and deliver to Seller a balance sheet (the "Balance Sheet") of USTMAN as of
     the Closing  Date, as defined below under Article III (prior to the effects
     of  the  transactions  occurring  at  the  Closing)  and a  statement  (the
     "Statement"),  reflecting the calculation of the adjustment, if any, to the
     Purchase  Price  pursuant to Section  2.4(b).  The  Balance  Sheet shall be
     prepared  in  accordance  with  generally  accepted  accounting  principles
     consistently  applied in the  United  States  and the  financial  reporting
     policies and procedures  utilized by Seller prior to the Closing  ("GAAP").
     Seller  shall  have a period of 30  calendar  days  after  delivery  of the
     Balance  Sheet and the  Statement  to review  such  documents  and make any
     objections  it may have in writing  to Buyer.  If  written  objections  are
     delivered  to Buyer by Seller  within  such 30-day  period,  then Buyer and
     Seller  shall  attempt to resolve the matter or matters in  dispute.  If no
     written  objections are made by Seller within such 30-day period,  then the
     Balance Sheet and the  Statement  shall be final and binding on the parties
     hereto.  If disputes  with  respect to the Balance  Sheet or the  Statement
     cannot be  resolved by Buyer and Seller  within 30 calendar  days after the
     delivery  of the  objections  thereto,  then,  at the  request  of Buyer or
     Seller,  the  specific  matters in  dispute  shall be  submitted  to Arthur
     Andersen & Co. or such other independent accounting firm as may be approved
     by Seller and Buyer (the  "Auditors"),  which firm shall render its opinion
     as to such matters. Based on such opinion, such independent accounting firm
     will then send to Seller  and  Buyer  its  determination  of the  specified
     matters in dispute,  which  determination shall be final and binding on the
     parties  hereto.  The  fees and  expenses  of the  Auditors  shall be borne
     one-half by Seller and one-half by Buyer.

          (b) The Purchase Price shall be adjusted to reflect the difference, if
     any,  between  the working  capital  balance of USTMAN as of the opening of
     business on the date of Closing after taking into account the  transactions
     set forth in Section 2.5 (the "Closing Balance") and $424,271 (representing
     the working  capital  balance of USTMAN as of December 31, 1996);  provided
     that for purposes of this Section 2.4,  working  capital balance shall mean
     the  difference  between  (i)  current  assets  (excluding  cash  and  cash
     equivalents) and

                                       -9-


<PAGE>



               (ii)  current  liabilities  (excluding  income  tax  payable  and
          amounts due Seth Hunt) each as determined in accordance  with GAAP. To
          the extent the Closing Balance is greater than $424,271,  the Purchase
          Price shall be adjusted  upward by an amount equal to the  difference;
          and to the  extent the  Closing  Balance  is less than  $424,271,  the
          Purchase  Price shall be adjusted  downward by an amount  equal to the
          difference. If the adjustment to Purchase Price is upward, then within
          five days following the final determination  thereof,  Buyer shall pay
          Seller by wire transfer in immediately  available funds to the account
          or  accounts  designated  by Seller the  amount by which the  Purchase
          Price is adjusted  upward.  If the  aggregate  adjustment  to Purchase
          Price  is  downward,   then  within  five  days  following  the  final
          determination  thereof,  Seller  shall pay Buyer by wire  transfer  in
          immediately  available funds to the account or accounts  designated by
          Buyer the amount by which the Purchase Price is adjusted downward. Any
          amount otherwise  payable as a result of an adjustment to the Purchase
          Price pursuant to this Section 2.4 may not be offset against any other
          obligation  (whether such obligation results from the  indemnification
          provisions  set forth in Article VII hereof,  the Purchase  Note,  the
          Subsidiary Guaranty, or otherwise), but shall be paid promptly.

     Section 2.5 Transactions Prior to Closing.

          (a) At or prior to the Closing,  Seller shall cause USTMAN to transfer
     to Seller all cash and cash  equivalents of USTMAN measured as of the close
     of business  on the day  immediately  prior to the date of Closing.  In the
     event that within 60 calendar  days  following  the  Closing  either  party
     determines  that the amount of such  transfer,  at the time  made,  was not
     equal to the  cash and cash  equivalents  of  USTMAN  immediately  prior to
     Closing,  either  party  shall  remit  the  difference  to  the  other,  as
     appropriate.  If a dispute  with  respect  to the  amount of such  transfer
     cannot be  resolved  by Buyer and  Seller  within 30  calendar  days  after
     notice,  then, at the request of Buyer or Seller,  the specific  matters in
     dispute  shall be  submitted to the  Auditors,  which firm shall render its
     opinion as to such matters,  which determination shall be final and binding
     on the  parties.  The  fees and  expenses  of the  Auditors  shall be borne
     one-half  by Seller and  one-half  by Buyer.  The  payment  of any  amounts
     following  Closing  pursuant to this Section 2.5(a) shall not be subject to
     any  set  off  rights  of  either  party.   Buyer  hereby   recognizes  and
     acknowledges  that such transfer shall not affect the Purchase  Price,  the
     Initial Balance,  the calculation of the Closing Balance or the calculation
     of the Purchase Price adjustment provided for pursuant to Section 2.4.

          (b) Prior to Closing,  Seller shall  eliminate or cause its Affiliates
     to eliminate  all  intercompany  account  balances  between  Seller and its
     Affiliates, on one hand, and USTMAN on the other.

          (c) At or prior to Closing, Seller shall execute assumption agreements
     reasonably  acceptable  to Buyer  assuming  from  USTMAN any and all income
     Taxes for the period through the Closing Date.




                                      -10-


<PAGE>



                                   ARTICLE III
                                     Closing

     The closing of the transactions  contemplated  hereby (the "Closing") shall
take place at such time and at such date as are mutually  agreed to by Buyer and
Seller at the offices of Baker & Botts, L.L.P., Houston, Texas, or New York, New
York but in no event  later  than May 22,  1997  except as  otherwise  agreed by
Seller.  The date on which the Closing is held is referred to in this  Agreement
as the "Closing Date".


                                   ARTICLE IV
                    Representations and Warranties of Seller

     Buyer and Seller  acknowledge  and agree  that  Seller has owned the Shares
only since the closing  (the  "October  Closing")  on October 25,  1996,  of the
acquisition  thereof  pursuant to the Stock Purchase  Agreement dated October 7,
1996 (the "October  Agreement"),  between Seller and  Tanknology  Environmental,
Inc. ("TEI").  Notwithstanding the foregoing,  Seller represents and warrants to
Buyer the following:

     Section 4.1 Organization  and Good Standing of the Company.  Each of Seller
and  USTMAN  is a  corporation  duly  organized,  validly  existing  and in good
standing under the laws of the  jurisdiction of its  incorporation  and has full
corporate power and authority to own, operate and lease its assets in the manner
currently  owned,  operated and leased by it and to carry on its business as now
conducted.  USTMAN is duly qualified to do business as a foreign  corporation in
all   jurisdictions   in  which  the  nature  of  its  business   requires  such
qualification  and where the  failure  to do so would  have a  material  adverse
effect on USTMAN.  Schedule 4.1 is a complete list of all jurisdictions in which
USTMAN is  currently  licensed or  qualified  to transact  business as a foreign
entity.

     Section 4.2 Corporate  Records.  Copies of the certificate of incorporation
and by-laws of USTMAN have been  delivered to Buyer and are complete and correct
as of the date  hereof.  The  minute  book and stock  book of  USTMAN  have been
exhibited to Buyer,  and each is a complete and accurate  record of the material
corporate actions of the stockholders and directors (and any committees thereof)
of USTMAN through the date hereof and all issuances, cancellations and transfers
of the capital stock thereof.

     Section 4.3  Authorization.  Seller has full corporate  power and authority
under  its  certificate  or  articles  of  incorporation  and  by-laws,  and all
necessary  corporate  action has been  taken to  authorize  it, to  execute  and
deliver this Agreement and the exhibits and schedules  hereto, to consummate the
transactions contemplated herein and to take all actions required to be taken by
it  pursuant  to the  provisions  hereof,  and  each of this  Agreement  and the
exhibits  hereto   constitutes  the  valid  and  binding  obligation  of  Seller
enforceable  against  Seller  in  accordance  with  its  terms,  except  as such
enforcement may be subject to bankruptcy, insolvency, reorganization, moratorium
or other similar laws now or hereafter in effect  relating to creditors'  rights
and general principles of equity.

                                      -11-


<PAGE>



     Section 4.4 Non-Contravention. Except as set forth in Schedule 4.4, neither
the  execution  and  delivery of this  Agreement  or any  documents  executed in
connection  herewith,  nor the  consummation  of the  transactions  contemplated
herein or therein,  does or will violate,  conflict with, result in breach of or
require  notice or consent under any  Applicable  Law, the charter or by-laws of
Seller or USTMAN or any provision of any agreement or instrument to which Seller
or  USTMAN is a party or result  in the  creation  of any Lien upon the  capital
stock,  properties or assets of USTMAN.  Except as set forth in Schedule 4.4, no
consent, approval, exemption,  authorization or other action of, or notice to or
filing with, any third party,  court or administrative or other  governmental or
regulatory  body is required by Seller or USTMAN to execute,  deliver or perform
this Agreement and to consummate  the  transactions  contemplated  herein and to
take all actions required to be taken by it pursuant to the provisions hereof.

     Section  4.5  Validity.  There are no pending  or  threatened  judicial  or
administration  actions,   proceedings  or  investigations  which  question  the
validity of this  Agreement  or any action  taken or  contemplated  by Seller in
connection with this Agreement.

     Section  4.6  Broker  Involvement.  Neither  Seller  nor  USTMAN has hired,
retained or dealt with any broker or finder in connection with the  transactions
contemplated by this Agreement.

     Section 4.7  Litigation.  Except as set forth in Schedule 4.7,  there is no
investigation,  claim  or  proceeding  or  litigation  of any  type  pending  or
threatened  involving  Seller or USTMAN or that would have an adverse  effect on
USTMAN,  and Seller is unaware after  reasonable  investigation of any judgment,
order, writ, injunction or decree of any court, government,  governmental agency
or arbitral tribunal against or involving Seller or USTMAN or that would have an
adverse effect on USTMAN or Buyer.

     Section  4.8  Title to  Shares.  All of the  outstanding  Shares  were duly
authorized for issuance and are validly  issued,  fully paid and  nonassessable,
and none of such Shares are held in treasury.  Seller owns, or will own prior to
Closing, the Shares beneficially and of record, free and clear of all Liens, and
such Shares are not, or will not be prior to Closing,  subject to any agreements
or  understandings  with respect to the voting or transfer of any of the Shares.
There  are  no  outstanding  subscriptions,   options,  convertible  securities,
warrants or calls of any kind issued or granted by, or binding  upon,  Seller to
purchase or otherwise acquire or to sell or otherwise dispose of any security of
or equity  interest  in USTMAN.  Seller has the  requisite  legal right to sell,
assign and transfer the Shares owned by it to Buyer and will, upon delivery of a
certificate or  certificates  representing  such Shares to Buyer pursuant to the
terms  hereof,  transfer  to Buyer title to such  Shares,  free and clear of any
Liens.

     Section 4.9 Contracts and  Commitments.  Schedule 4.9 lists all agreements,
leases, commitments, contracts, undertakings or understandings, oral or written,
to  which  USTMAN  is a party  as of the date of  execution  of this  Agreement,
including but not limited to trademark, trade name or patent license agreements,
service  agreements,  lease,  purchase or sale  agreements,  supply  agreements,
distribution or distributor  agreements,  purchase  orders,  customer orders and
equipment  rental  agreements,  that are  either  material  to USTMAN or involve
consideration  with a  value of $50,000  or more.  USTMAN is not in breach of or

                                      -12-


<PAGE>



default under any agreement,  lease,  contract or commitment listed or of a type
required to be listed  (without  regard to the date  thereof)  in  Schedule  4.9
(collectively,  the  "Agreements").  Each  Agreement  is a  valid,  binding  and
enforceable agreement of USTMAN and, to the knowledge of Seller after reasonable
investigation, the other parties thereto, enforceable except as such enforcement
may be subject to bankruptcy,  insolvency,  reorganization,  moratorium or other
similar  laws now or  hereafter  in effect  relating  to  creditors'  rights and
general principles of equity. There has not occurred any breach or default under
any  Agreement  on the part of the  other  parties  thereto,  and no  event  has
occurred  which with the giving of notice or the lapse of time,  or both,  would
constitute  a default  under any  Agreement.  There is no  dispute  between  the
parties to any Agreement as to the  interpretation  thereof or as to whether any
party is in breach or  default  thereunder,  and no party to any  Agreement  has
indicated its intention to, or suggested it may evaluate  whether to,  terminate
any Agreement. USTMAN is not a party to any covenant or obligation of any nature
limiting  the  freedom of USTMAN to compete  in any line of  business  after the
Closing.  No notice  has been given  under any lease to extend  the term  hereof
beyond its current term.

     Section 4.10 Taxes.

          (a)  USTMAN and any  affiliated,  combined  or unitary  group of which
     USTMAN  is or  was a  member  has  (i)  timely  (taking  into  account  any
     extensions)  filed all Tax Returns  required to be filed or sent by or with
     respect  to it in  respect  of  any  Taxes,  (ii)  timely  paid  all  Taxes
     (including  estimated  Taxes) that are due and payable for which USTMAN may
     be liable,  (iii) established reserves that are adequate for the payment of
     all Taxes not yet due and payable with respect to the results of operations
     of USTMAN  through the Closing Date and (iv)  complied in all respects with
     all  applicable  laws,  rules and  regulations  relating to the payment and
     withholding of Taxes and has in all respects  timely withheld from employee
     wages and paid over to the proper taxing and other governmental authorities
     all amounts  required to be so withheld and paid over,  based on the manner
     in which USTMAN has classified its employees under the Fair Labor Standards
     Act and Department of Transportation regulations.

          (b) Schedule 4.10 sets forth any affiliated,  consolidated,  combined,
     unitary or similar group Tax Return in which USTMAN is or has been a member
     or is or has joined in the filing.  Except to the extent being contested in
     good faith, all deficiencies asserted as a result of such examinations have
     been paid, fully settled or adequately provided for in accordance with GAAP
     as reflected in Seller's most recent audited financial  statements.  No Tax
     audits  or  other  administrative  proceedings  or  court  proceedings  are
     presently  pending  with  regard to any Taxes  for  which  USTMAN  would be
     liable, and no deficiency for any such Taxes has been proposed, asserted or
     assessed  pursuant  to  such  examination  against  USTMAN  by  any  taxing
     authority with respect to any period.

          (c) USTMAN has not  executed or entered into with the IRS or any other
     taxing  authority (i) any agreement or other  document  extending or having
     the effect of extending the period for assessments or collection of any Tax
     for which  USTMAN would be liable or (ii) a closing  agreement  pursuant to
     Section 7121 of the Code that relates to the assets or operations of USTMAN

                                      -13-


<PAGE>



     other than  the items noted on  Schedule 4.10.  There are no Tax liens upon
     any assets of USTMAN.

          (d) USTMAN has not made an election  under Section  341(f) of the Code
     or agreed to have Section 341(f)(2) of the Code apply to any disposition of
     a subsection (f) asset (as such term is defined in Section 341(f)(4) of the
     Code) owned by USTMAN.

          (e) USTMAN is not a party to, is bound by or has any obligation  under
     any Tax sharing agreement or similar agreement or arrangement.

     Section  4.11 Title to  Properties.  Except as set forth in  Schedule  4.11
hereto,  USTMAN has good and indefeasible  title to all of its assets,  free and
clear of all Liens.

     Section 4.12 Trademarks,  Trade Names and Intellectual  Property.  Schedule
4.12 contains an accurate and complete list of (a) all patents,  pending  patent
applications and invention memoranda owned by USTMAN or relating to the Business
of USTMAN, (b) all registered United States and foreign trademarks,  trade names
and logos  owned or used by USTMAN  and all  registrations  thereof  and (c) all
unregistered United States and foreign trademarks, trade names and logos used by
USTMAN. USTMAN has the right to use all trademarks, trade names, logos, patents,
pending patent applications and invention  memoranda referred to herein.  Except
as expressly set forth in Schedule 4.7 hereto, there is no pending or threatened
action  or claim  that  would  impair  any such  right.  Except  as set forth in
Schedule 4.12 hereto, USTMAN is the sole and exclusive owner of, with all right,
title and interest in and to, each item  described in Schedule 4.12 and has sole
and exclusive rights to the use thereof or the material covered thereby.

     Section 4.13 Financial Records;  Budget. The unaudited financial statements
of  USTMAN  as of and for the  year  ended  December  31,  1996 as set  forth on
Schedule 4.13 (the "Financial Statements") are each accurate, complete, true and
correct in all material respects,  were prepared in accordance with GAAP (except
as set forth therein), and fairly present in all material respects the financial
condition and results of operations of USTMAN.

     Section 4.14  Condition of Assets and  Inventory.  All the assets of USTMAN
are in good, serviceable condition and fit for the particular purposes for which
they are used in the  business  of the  owner  thereof,  subject  only to normal
maintenance  requirements  and normal wear and tear  reasonably  expected in the
ordinary course of business.  All items of inventory of USTMAN are  merchantable
or (in the case of raw  materials,  supplies  and work in process)  suitable and
useable for the production or completion of merchantable  products,  for sale in
the ordinary  course of business as first quality  goods at mark-ups  consistent
with past practice,  none of such items is below standard  quality,  obsolete or
obsolescent, and each item is reflected in the Financial Statements on the basis
of a physical  count and is valued at the lower of cost or market in  accordance
with GAAP  (including  any required  reduction for impaired value or slow-moving
inventory).  Such inventory  includes a sufficient but not an excess quantity of
each type of such inventory to meet the normal requirements of USTMAN.


                                      -14-


<PAGE>



     Section 4.15  Liabilities.  Except as set forth in Schedule  4.15 or in the
financial  statements and notes thereto referred to in Section 4.13, there is no
existing,  contingent or, to Seller's knowledge after reasonable  investigation,
material  threatened  liability,   obligation,  lien  or  claim  of  any  nature
(absolute,  accrued, contingent or otherwise) that relates to or has been or may
be asserted against USTMAN.

     Section 4.16 Employees and Related Matters.

          (a) Set forth on Schedule  4.16 is a complete list of all employees of
     USTMAN, listing the title or position held, base salary, any commissions or
     other  compensation  paid or payable in 1996 as reflected on such Schedule,
     all employee benefits received by such employees and any other terms of any
     oral or written agreement between any such employee and USTMAN.  Seller has
     heretofore delivered to Buyer true and correct copies of each management or
     employment  contract  or  contract  for  personal  services  and a complete
     description  of any other  understanding  or commitment  between USTMAN (or
     Seller  on  behalf  of  USTMAN)  and  any  officer,  consultant,  director,
     employee, independent contractor or other person or entity.

          (b) USTMAN is not a party to any  collective  bargaining  agreement or
     labor contract.

          (c) Based on the  assumption  that Buyer  intends to retain all of the
     current  employees  of USTMAN,  USTMAN has taken all  necessary  actions to
     comply with the Worker  Adjustment  and  Retraining  Notification  Act (the
     "WARN Act")  through the Closing  Date, to the extent it is subject to such
     act, and Buyer shall not have any  disclosure or  announcement  obligations
     under  the WARN Act as a result  of the  transaction  contemplated  by this
     Agreement.

     Section 4.17 No Material Change.  There has been no material adverse change
in the business,  results of operations,  assets or financial position of USTMAN
from  December  31, 1996 to and  including  the Closing  Date,  and no event has
occurred  which could be  expected  to lead to or cause such a material  adverse
change.

     Section  4.18  Compliance  With  Law.  USTMAN  is not in  violation  of any
provision of Applicable Law, including any Environmental Law, and USTMAN has not
received any notice of any alleged  violation of such  Applicable  Law, which in
either case would result in a material adverse effect on USTMAN.

     Section 4.19 Tangible  Personal  Property.  Except for the Excluded Assets,
all of  the  fixtures,  machinery  and  equipment  reflected  in  the  Financial
Statements  and/or  used in  connection  with the  Business of USTMAN are in the
possession  and under  the  operating  control  of  USTMAN  ("Tangible  Personal
Property").  Except as set forth in Schedule  4.19  hereto,  no item of Tangible
Personal  Property  requires  repairs  in  excess  of  $2,500  to  be  in  good,
serviceable  condition  and fit for  the  particular  purpose  for  which  it is
currently used, subject only to normal maintenance  requirements and normal wear
and tear reasonably expected in the ordinary course of business.

                                      -15-


<PAGE>



     Section 4.20  Insurance.  Schedule  4.20  contains a list of all  insurance
policies of Seller or USTMAN or relating to the conduct of the  Business and the
status of  prepayments.  Seller has heretofore  delivered to Buyer a copy of all
such policies. Such policies are in full force and effect, and Seller and USTMAN
are not in default under any of them.

     Section 4.21 Government Licenses,  Permits and Related Approvals.  Schedule
4.21 sets forth a list of all  Permits  required  for the conduct of Business by
USTMAN,  all of which are in full force and effect and are not being violated in
any manner which would have a material adverse effect on USTMAN.

     Section  4.22  Distributed  Products.  Schedule  4.22 sets forth a complete
listing of all products (a) distributed by USTMAN (and the manufacturer  thereof
and the person, if different,  for whom USTMAN  distributes such product) or (b)
manufactured  or sold by USTMAN and  distributed by others (and the name of such
distributor).  Such Schedule also sets forth the terms of each such distribution
arrangement.  USTMAN has full right to  distribute  all products  referred to in
clause (a) of this Section.

     Section 4.23 Safety Reports. Schedule 4.23 sets forth a complete listing of
all  insurance  loss runs,  worker's  compensation  reports and  claims,  safety
citations  and reports,  OSHA reports and all  documents  respecting  USTMAN and
relating to any of the foregoing since July 1, 1993.

     Section  4.24  Transactions  with Certain  Persons.  Except as set forth in
Schedule 4.24, since October 25, 1996,  USTMAN has not,  directly or indirectly,
purchased,  leased or  otherwise  acquired any property or obtained any services
from,  or sold,  leased or otherwise  disposed of any property or furnished  any
services to, or otherwise  dealt with (except with respect to  remuneration  for
services rendered as a director, officer or employee of USTMAN), in the ordinary
course of business or otherwise,  with a value of or in a transaction  or series
of  transactions  with a value of $60,000 or more, (a) any officer,  director or
shareholder  of Seller or any  Affiliate  thereof  other than  USTMAN or (b) any
person,  firm or corporation  which,  directly or indirectly,  alone or together
with others,  controls,  is controlled by or is under common control with Seller
or any shareholder  thereof.  Except as set forth in Schedule 4.24,  USTMAN does
not owe any amount to, or have any contract  with or  commitment  to, any of its
shareholders,   directors,   officers,  employees  or  consultants  (other  than
compensation for current  services not yet due and payable and  reimbursement of
expenses  arising in the ordinary  course of business not in excess of $1,000 in
the aggregate), and none of such persons owes any amount to USTMAN.

     Section 4.25 Accounts Receivable. All the accounts receivable of USTMAN are
valid,  genuine and  subsisting,  arise out of bona fide sales and deliveries of
goods,  performance of services or other business  transactions  in the ordinary
course of  business,  are owned free and clear and not subject to any Lien,  and
are  current  and  collectible  net  of any  reserves  shown  on  the  Financial
Statements  as of December  31,  1996  (which  reserves  are  adequate  and were
calculated consistently with past practice).


                                      -16-


<PAGE>



     Section 4.26 Studies,  Etc. Schedule 4.26 sets forth a complete list of all
studies,  reports,  plans,  analyses or similar  documents of a material  nature
(whether  prepared by employees of Seller or USTMAN or others) in the possession
or control of Seller or USTMAN  thereof  relating  to safety,  the  environment,
Hazardous  Material,  intellectual  property,  markets,  competitors,  strategic
planning,  product  liability,  warranties  or  otherwise  relating  directly to
USTMAN.

     Section 4.27  Disclosure.  All schedules to this Agreement are complete and
accurate  in  all  material  respects  or  will  be  on  the  Closing  Date.  No
representation  or warranty by Seller in this  Agreement  or in any  schedule or
exhibit to this Agreement,  or in any statement or certificate or other document
furnished to Buyer by Seller or any  representative of Seller,  contains or will
contain any untrue statement of a material fact or omits or will omit a material
fact necessary to make the statements  therein not  misleading.  The information
concerning  Seller  in  Seller's  filings,  reports  and  submissions  under the
Securities  Exchange Act of 1934,  as amended  (the  "Exchange  Act"),  does not
contain  any  untrue  statement  of a  material  fact  or omit a  material  fact
necessary to make the statements therein not misleading.

     Section 4.28 Employee Benefits.

          (a) For purposes of Section  4.28,  all  references to Seller shall be
     deemed to refer to Seller, USTMAN and any trade or business, whether or not
     incorporated,  that  together  with  Seller  or  USTMAN  would be deemed or
     treated as a "single  employer"  within the meaning of Section  4001 of the
     Employee  Retirement  Income Security Act of 1974, as amended  ("ERISA") or
     Code Section 414.

          The term "Seller  Plan" shall mean any stock  purchase,  stock option,
     pension,   profit-sharing,   retirement,   bonus,  deferred   compensation,
     incentive   compensation,   commission,   severance  or  termination   pay,
     hospitalization,  medical, dental, disability,  life or other insurance, or
     supplemental  unemployment benefits plan or agreement or policy or contract
     or other  arrangement that is or ever has been maintained or contributed to
     by Seller for the purpose of providing  employment-related  compensation or
     benefits to any current or former officer, consultant, director, annuitant,
     employee,  retiree or independent  contractor of Seller or members of their
     respective   families  (other  than  directors'  and  officers'   liability
     policies),  whether or not insured,  including without limitation "employee
     benefit  plans"  as  defined  in  ERISA  and  the  rules  and   regulations
     thereunder.

          The term  "USTMAN  Plan"  shall  mean any  Seller  Plan that  formerly
     provided,  provides or is intended to provide  compensation  or benefits to
     any person or member of a person's family as a consequence of that person's
     current or former relationship to USTMAN.

          (b) As of the Closing  Date, no Seller Plan is or has been (i) covered
     by Title IV of ERISA,  (ii) subject to the minimum funding  requirements of
     Section  412 of the  Code,  (iii) a  "multi-employer  plan" as  defined  in
     Section 3(37) of ERISA, (iv) subject  to  Section 4063 or 4064 of ERISA, or

                                      -17-


<PAGE>



     or (v) a  voluntary  employees' beneficiary  association  within  the mean-
     ing of Code Section 501(c)(9).

          (c) Seller has no  commitment  or obligation to establish or adopt any
     new or  additional  plans or other  arrangements  that would  constitute an
     USTMAN Plan if adopted,  or to increase  materially  the benefits under any
     existing  USTMAN Plan.  Schedule 4.28 sets forth true and correct copies of
     the following:

               (i) each written USTMAN Plan and all amendments thereto as of the
          date hereof;

               (ii) a complete written description of each other USTMAN Plan;

               (iii) all current summary plan descriptions provided to employees
          regarding the USTMAN Plans;

               (iv) each trust  agreement  and  annuity  contract  (or any other
          funding instruments),  and each insurance contract,  pertaining to any
          of the USTMAN Plans, including all amendments to such documents to the
          date hereof;

               (v) the  most  recent  IRS  Form 5500  for any  USTMAN  Plan  and
          schedules thereto; and

               (vi) the most recent  determination letter issued by the IRS with
          respect to any USTMAN Plan qualified under Section 401(a) of the Code.

          (d) Each  USTMAN  Plan is in  compliance  with the  provisions  of all
     applicable  laws,  rules and regulations,  including,  without  limitation,
     ERISA and the Code.  No person has  engaged in any  prohibited  transaction
     (within  the  meaning of Section  4975 of the Code or Section 406 of ERISA)
     that could subject USTMAN to a liability.

          (e) All contributions and premiums required of USTMAN (or of Seller on
     behalf of  USTMAN) by any legal  requirement  or by the terms of any Seller
     Plan or any contract relating thereto have been timely made (without regard
     to any waivers granted with respect thereto) or accrued. All obligations of
     USTMAN (and of Seller on behalf of USTMAN) with respect to each Seller Plan
     have been paid or performed.

          (f) Except as  provided in  Schedule  4.28,  no Seller Plan nor USTMAN
     Plan  provides for  medical,  life  insurance  or health  benefits or death
     benefits  after  an  employee's   termination   of  employment   (including
     retirement)  except for continuation  coverage required pursuant to Section
     4980B  of the Code  and  Part 6 of  Title I of  ERISA  and the  regulations
     thereunder.

          (g)  USTMAN  has no  obligation  to make any  payments  that  would be
     "excess  parachute  payments" under Section 280G of the Code. Except as set
     forth on Schedule 4.24,  consummation of  the transactions  contemplated by

                                      -18-


<PAGE>



     this  Agreement  will not (A)  entitle  any  current or former  employee of
     USTMAN to severance  pay,  employment  compensation  or any other  payment,
     benefit  or  award  (whether  under an  USTMAN  Plan or  otherwise)  or (B)
     accelerate  the time of payment or vesting,  or increase  the amount of any
     benefit,  award  (including  stock  options,  restricted  stock and similar
     awards) or compensation due any such employee or former employee.

          (h)  There  are  no  pending,  threatened  or  anticipated  claims  or
     proceedings  against  any USTMAN  Plan,  the  assets of any USTMAN  Plan or
     USTMAN,  or the plan  administrator  or  fiduciary  of any USTMAN Plan with
     respect to the operation of any such plan (other than routine,  uncontested
     benefit claims),  and there are no facts or  circumstances  that could form
     the basis for any such claim or proceeding.

     Section 4.29 Environmental Matters.

          (a) The  operations  of USTMAN have been and, as of the Closing  Date,
     will  be,  in  compliance  with  all  Environmental  Laws  in all  material
     respects;

          (b) USTMAN has obtained and will, as of the Closing Date, maintain all
     Permits and has made and will,  as of the Closing  Date,  make all material
     filings, reports and notices required under applicable Environmental Law in
     connection with the operations of their respective businesses;

          (c) As of the date  hereof,  USTMAN is not subject to any  outstanding
     written  orders,  contracts or agreements with any  governmental  entity or
     other person respecting (i) Environmental Law, (ii) Remedial Action,  (iii)
     any  Release  or  threatened  Release  of  Hazardous  Material  or  (iv) an
     assumption of responsibility for environmental claims of another entity;

          (d) USTMAN has not received any written communication  alleging,  with
     respect to any such party,  a material  violation of or material  liability
     under any Environmental Law or requesting,  with respect to any such party,
     information  with  respect to an  investigation  pursuant  to CERCLA or any
     other Environmental Law;

          (e) USTMAN has no material contingent liability in connection with the
     Release of any Hazardous  Material  into the indoor or outdoor  environment
     (whether  on-site or  off-site)  or  employee  or  third-party  exposure to
     Hazardous Materials;

          (f) The operations of USTMAN involving the generation, transportation,
     treatment, storage or disposal of hazardous waste, as defined and regulated
     under 40 C.F.R.  parts 260-270 or any state  equivalent,  are in compliance
     with applicable Environmental Laws in all material respects; and

          (g) Except as described on Schedule  4.29,  there is not now,  nor, to
     the best knowledge of Seller as of the date hereof, or has there ever been,
     on or in any property owned, operated, leased or under option by, USTMAN or

                                      -19-


<PAGE>



     for which  USTMAN has assumed  responsibility  for  material  environmental
     claims, any of the following:  (i) any underground storage tanks or surface
     impoundments,  (ii)  any  on-site  disposal  of solid  waste  or  Hazardous
     Materials,   (iii)   any   asbestos-containing   materials   or  (iv)   any
     polychlorinated biphenyls.

     Section 4.30 Knowledge of Seller.  Notwithstanding  (but without  limiting)
the other  representations and warranties of Seller set forth in this Agreement,
except  for the  liabilities  of  USTMAN  to Seth  Hunt,  Seller  has no  actual
knowledge  of  any  error,  inaccuracy,   breach  or  misrepresentation  of  any
representation   or  warranty  relating  to  USTMAN  contained  in  the  October
Agreement.

     Section 4.31 Conduct of the Business.  Since December 31, 1996,  USTMAN has
complied with the provisions set forth below:

          (a) USTMAN has operated its Business in the ordinary course;

          (b) Except as set forth in Schedule  4.31,  neither  Seller nor USTMAN
     has (i)  granted or agreed to grant any bonuses to any  employee,  officer,
     director,  representative  or agent of USTMAN,  (ii)  granted  any  general
     increase in the rates of salaries or compensation  of employees,  officers,
     directors,  representatives  or agents of USTMAN or any  material  specific
     increase to any employee,  officer,  director,  representative  or agent of
     USTMAN, (iii) provided for any new pension,  retirement or other employment
     benefits to any employee, officer, director, representative or agent of any
     of USTMAN or any  increase in any existing  benefits,  (iv)  terminated  or
     amended in any  material  respect or provide for any  material  increase in
     benefits  under any Seller Plan or (v) executed any  employment  agreement,
     severance  arrangement,  consulting  arrangement,  sales agency  agreement,
     representation  agreement  or  distribution  agreement  with any  employee,
     officer, director, representative or agent of USTMAN;

          (c) USTMAN has not amended its certificate of incorporation or by-laws
     and neither Seller nor USTMAN has entered into any merger or  consolidation
     agreement involving USTMAN or its assets;

          (d) Neither  Seller nor USTMAN has  authorized  for issuance,  issued,
     sold,  delivered or agreed or commited to issue,  sell or deliver  (whether
     through  the  issuance  or  granting  of  options,  warrants,  commitments,
     subscriptions,  rights to purchase or  otherwise)  any capital stock of any
     class or any other  securities or equity  equivalents  of USTMAN or amended
     any of the terms of any such securities or agreements;

          (e) USTMAN has not sold,  assigned or disposed of any of its  material
     assets or  properties,  tangible or  intangible,  or incured or assumed any
     liabilities  or entered  into any  sale/leaseback  or similar  transaction,
     except for sales and  dispositions  made, or liabilities  incurred,  in the
     ordinary course of business consistent with past practices;


                                      -20-


<PAGE>



          (f) Seller has used its best  efforts to (i) maintain and preserve the
     Business,  (ii)  retain  USTMAN's  employees  and (iii)  maintain  USTMAN's
     relationships with customers, suppliers and others;

          (g) USTMAN has not assumed,  guaranteed,  endorsed or otherwise become
     liable or responsible (whether directly, contingently or otherwise) for the
     obligations  of any other  person or made any  loans,  advances  or capital
     contributions to or investments in any other person,  with the exception of
     certain  purchase  orders and related cash deposits with Caldwell  Systems;
     and

          (h) Seller and USTMAN have not  implemented  or adopted (i) any change
     in  its  accounting  methods  or  principles  or  the  application  thereof
     (including  depreciation  lives)  or (ii) any  material  change  in its tax
     methods or principles or the application  thereof  (including  depreciation
     lives).


                                    ARTICLE V
                     Representations and Warranties of Buyer

     Buyer represents and warrants to Seller the following:

     Section 5.1 Corporate Status and Good Standing. Buyer is a corporation duly
organized,  validly  existing and in good standing under the laws of California,
with full  corporate  power and  authority  under its  articles  certificate  of
incorporation and by-laws to conduct its business as the same exists on the date
hereof and on the Closing Date.

     Section 5.2  Authorization.  Buyer has full  corporate  power and authority
under its articles of  incorporation  and by-laws,  and all necessary  corporate
action has been taken to authorize  it, to execute and deliver  this  Agreement,
the Purchase  Note and the exhibits and  schedules  hereto,  to  consummate  the
transactions contemplated herein and to take all actions required to be taken by
it pursuant to the provisions hereof or thereof,  and each of this Agreement and
the  exhibits  hereto  constitutes  the valid and  binding  obligation  of Buyer
enforceable  against  Buyer  in  accordance  with  its  terms,  except  as  such
enforcement may be subject to bankruptcy, insolvency, reorganization, moratorium
or other similar laws now or hereafter in effect  relating to creditors'  rights
and general principles of equity.

     Section 5.3  Non-Contravention.  Neither the execution and delivery of this
Agreement and the schedules and exhibits  hereto,  nor the  consummation  of the
transactions contemplated herein or therein, does or will violate, conflict with
or result in breach of or require  notice or consent under any  Applicable  Law,
the charter or by-laws of Buyer or any  provision of any agreement or instrument
to which Buyer is a party or result in the creation of any Lien upon the capital
stock,  property or assets of Buyer, such that there would be a material adverse
effect on any benefit to Seller hereunder.  Except as set forth in Schedule 5.3,
no consent, approval, exemption,  authorization or other action of, or notice to
or filing with, any third party,  court or administrative or other  governmental
or regulatory body is  required  by Buyer to execute, deliver  or  perform  this

                                      -21-


<PAGE>



Agreement and to consummate the transactions contemplated herein and to take all
actions required to be taken by it pursuant to the provisions hereof.

     Section  5.4  Validity.  There are no pending  or  threatened  judicial  or
administrative  actions,   proceedings  or  investigations  which  question  the
validity  of this  Agreement  or any action  taken or  contemplated  by Buyer in
connection with this Agreement.

     Section 5.5 Broker Involvement. Buyer has not hired, retained or dealt with
any broker or finder in connection  with the  transactions  contemplated by this
Agreement.

     Section 5.6 Litigation.  There is no investigation,  claim or proceeding or
litigation  of any type  pending  or  threatened  involving  Buyer  and Buyer is
unaware  of any  judgment,  order,  writ,  injunction  or decree  of any  court,
government  or  governmental  agency or arbitral  tribunal  against or involving
Buyer,  that  would  have a  material  adverse  effect on any  benefit to Seller
hereunder.

     Section 5.7 Investment  Intention.  The Shares are being purchased by Buyer
for  investment  purposes,  and not with a view to, or for resale in  connection
with, the distribution or other disposition thereof.

     Section 5.8 Disclosure of Information.  Buyer agrees and acknowledges  that
it and its employees,  officers and agents have been permitted full and complete
access to the books and records,  plants,  facilities,  equipment,  tax returns,
contracts,  inventories  and other assets and information of USTMAN which it and
its  employees,  officers  and agents  have  desired to  review.  Buyer  further
acknowledges  that it has conducted such  investigation  of USTMAN,  its assets,
liabilities, operations and financial conditions, as it has deemed necessary and
advisable for purposes of  determining to enter into this  Agreement.  Except to
the extent of the express  representations,  warranties and agreements contained
in this  Agreement,  Buyer is  purchasing  the Shares in  reliance  upon its own
investigation of USTMAN. Buyer agrees and acknowledges that it is experienced in
the  statistical  inventory  reconciliation  business and has the  knowledge and
ability  to conduct a full  investigation  of USTMAN  and to  evaluate  USTMAN's
business,  operations,  financial  conditions,  assets  and  liabilities.  Buyer
expressly  represents and warrants that it has not relied on any  projections or
representations  (oral or  written)  except as set out  herein,  which Buyer has
obtained  from  Seller  or  USTMAN  and/or  any of their  respective  directors,
officers, employees or agents.

     Section 5.9 Financial  Condition.  At Closing,  Buyer's financial condition
will be adequate to bear the economic risks of this  acquisition.  Except as set
forth on Schedule 5.9, at Closing Buyer will be in compliance with all financial
and  other  covenants  related  to  all  of its  outstanding  credit  agreements
including the facilities  being utilized to consummate this transaction and will
not be in default on any credit agreement or facility.

     Section 5.10 Restricted  Securities.  Buyer understands that the Shares are
characterized  as  "restricted  securities"  under  the  United  States  federal
securities  laws and that under such laws and applicable  rules and  regulations
promulgated  thereunder the Shares may be resold without  registration under the
Securities Act of 1933, as  amended (the "Act") only  in certain  circumstances.

                                      -22-


<PAGE>



Buyer  understands  that the  certificates  evidencing  the Shares may contain a
legend  restricting  transfer as provided under the Act and applicable rules and
regulations promulgated thereunder.


                                   ARTICLE VI
                       Additional Agreements and Covenants

     Section 6.1 Other  Offers.  From and after the date hereof  until  Closing,
Seller and each of its officers, directors, stockholders, employees, affiliates,
representatives or agents shall not, directly or indirectly,  (a) solicit, enter
into or conduct  discussions  relating to,  initiate or knowingly  encourage any
offer or proposal for, or any indication of interest in, directly or indirectly,
a merger or  business  combination  involving  USTMAN or the  acquisition  of an
equity  interest in, or a  substantial  portion of the assets of,  USTMAN or (b)
unless  required  by  law,  regulation  or  judicial  compulsion,  disclose  any
nonpublic  information  relating to USTMAN or the Business of USTMAN,  or afford
access to the properties, books or records of USTMAN, to any person.

     Section 6.2 Public  Announcements.  Prior to Closing,  neither  party shall
make any public announcement,  issue any press release,  mention the transaction
provided for herein to any analyst or any stockholder who is not also an officer
or director of either party, or otherwise reveal the existence of this Agreement
or the transaction  provided for herein without the prior written consent of the
other party,  unless, on written advice of counsel,  management of the releasing
entity  determines  the release is required  to comply with  applicable  federal
securities laws. In the event of a required  release,  the releasing party shall
deliver a copy of the written advice of counsel and the proposed  release to the
other party two business days prior to an intended release.

     Section  6.3  Further  Assurances.  Seller and Buyer  each  shall  execute,
acknowledge and deliver or cause to be executed,  acknowledged  and delivered to
Buyer or Seller,  as the case may be, such  assignments or other  instruments of
transfer,   assignment  and  conveyance,   in  form  and  substance   reasonably
satisfactory  to  Buyer  or  Seller,  as the case  may be,  on  advice  of their
respective  counsel,  as shall be  necessary  to vest in Buyer all of the right,
title and  interest in and to the Shares  free and clear of all liens,  charges,
encumbrances,  rights of others,  mortgages,  pledges or security interests, and
any  other  document  reasonably  requested  by Buyer in  connection  with  this
Agreement.  Seller and Buyer each agree that, from time to time, whether before,
at or  after  the  Closing  Date,  it will  execute  and  deliver  such  further
instruments  and take such other action as may be reasonably  necessary to carry
out the purposes and intent of this Agreement.

     Section 6.4 Covenant Against Competition.

          (a) As an essential  consideration  for the obligations of the parties
     under this Agreement,  Buyer and Seller hereby agree and covenant,  subject
     to Section 6.4(c) below, as follows:

               (i) for a period of five years following the Closing Date, in the
          United  States,  Seller  and/or its  Affiliates  shall not  develop or
          license software that provides  Statistical  Inventory  Reconciliation

                                      -23-


<PAGE>



          certified  pursuant to  protocols of the United  States  Environmental
          Protection  Agency  ("Certified  SIR"),  nor will it enter  into joint
          ventures,  affiliations  or other  agreements  with  third  parties to
          develop,  market or sell Certified SIR; provided,  that this provision
          shall not restrict  Seller and/or its Affiliates  from (A) developing,
          marketing or distributing  automatic tank gauges,  tank level monitors
          or other  equipment  based at an  underground  storage  tank site that
          offers a Certified  SIR product as an  integral  component  ("Imbedded
          SIR"),  (B) becoming  affiliated or entering into joint  ventures with
          any other person  selling and/or  distributing  products with Imbedded
          SIR,  (C)  remotely  monitoring  products  with  Imbedded  SIR  or (D)
          developing   products  for  inventory  purposes  not  associated  with
          Certified SIR. In the event Seller and/or its Affiliates  develops any
          products pursuant to (A) above, Seller will give Buyer the first right
          of refusal to license the  Certified SIR system to be imbedded in such
          products and/or for any statistical  evaluation services in connection
          therewith.

               (ii) For a period of five years  after the Closing  Date,  in the
          United States,  Buyer and/or its  Affiliates  shall not own or operate
          vehicles  for   servicing   underground   storage  tank  sites  ("Site
          Services"),  other  than for the  limited  purpose  of  installing  or
          marketing  in-tank  gauges which are  manufactured  or  distributed by
          Buyer;  provided that this provisions  shall not restrict Buyer and/or
          its Affiliates from (A) marketing or distributing any Site Services of
          any person  other than Buyer or an  Affiliate  of Buyer,  (B) becoming
          affiliated or entering into joint ventures with any other person which
          owns or operates  vehicles for Site Services or (C)  operating  remote
          monitoring  systems and utilizing any other person's Site Services for
          responses.

               (b) If either party  believes the other party or any Affiliate of
          the other party has violated the  provisions of Section  6.4(a),  such
          party shall have the right to seek relief from any court of  competent
          jurisdiction.  The parties  acknowledge  that money damages alone will
          not  provide  adequate  compensation  in the  event of a breach of the
          covenants  of this  Section.  Therefore,  the  parties  agree  that in
          addition  to all  remedies  available  at law, in equity or under this
          Agreement,  the  non-breaching  party shall be entitled to  injunctive
          relief for the  enforcement of this  covenant.  The parties agree that
          the  covenants  in this Section are  reasonable  with respect to their
          duration,  scope and geographical area. If, at the time of enforcement
          of this Section, a court should hold that the restrictions  herein are
          unreasonable under the circumstances  then existing or otherwise,  the
          parties agree that the maximum  duration,  scope or geographical  area
          legally  permissible under such  circumstances will be substituted for
          the duration, scope or area stated herein.

               (c) Notwithstanding Section 6.4(a)(ii):

                    (i) For a period of twelve  months  after the Closing  Date,
               Toxguard Systems,  Inc. a Nevada corporation and a majority-owned
               subsidiary of Buyer ("Toxguard"), shall not be  prohibited by the

                                      -24-


<PAGE>



               terms of this Agreement from conducting its business as conducted
               at the Closing  Date,  provided  that  Toxguard  shall not own or
               operate any vehicles for the provision of Site Services not owned
               and operated at the Closing Date except as specifically permitted
               pursuant to Section 6.4(a)(ii).

                    (ii) Seller hereby recognizes and acknowledges that Buyer is
               considering   the   acquisition  of  the  business  (the  "Target
               Business")  of the person set forth on Schedule  6.4  ("Target"),
               either through the purchase of substantially all of the assets or
               all of the  issued  and  outstanding  stock of  Target,  and that
               certain  activities in connection  with the Target Business would
               be in violation of Section  6.4(a)(ii)  if such  activities  were
               conducted  by Buyer  or an  Affiliate  of  Buyer.  Seller  hereby
               consents to the  acquisition by Buyer of the Target  Business and
               agrees  that the  provisions  of  Section  6.4(a)(ii)  shall  not
               restrict Buyer or Target from  conducting the Target  Business as
               conducted at the date of the  acquisition of the Target  Business
               by Buyer (the "Target  Acquisition Date") for a period of 3 years
               from the Target Acquisition Date; provided that neither Buyer nor
               Target  shall (A) enter into any  contracts  (not  including  any
               renewals or extensions of existing  contracts)  for the provision
               of Site Services after the Target  Acquisition  Date, (B) provide
               Site  Services in any  geographical  area not served prior to the
               date  of  Closing  or (C) own or  operate  any  vehicles  for the
               provision of Site  Services in addition to the number of vehicles
               so owned and operated at the date of Closing, in any case whether
               in connection with the Target Business or otherwise.

     Section 6.5  Governmental  Filings.  As promptly as  practicable  after the
execution of this Agreement,  each party shall,  in cooperation  with the other,
file any reports or  notifications  that may be required to be filed by it under
applicable  law and  shall  furnish  to the other  all such  information  in its
possession  as  may  be  necessary   for  the   completion  of  the  reports  or
notifications to be filed by the other.

     Section 6.6 Access to  Information.  Prior to Closing,  Buyer may make such
investigation  of the business and properties of USTMAN as Buyer may desire and,
upon reasonable  notice,  Seller and USTMAN shall give to Buyer and its counsel,
accountants and other representatives  reasonable access, during normal business
hours  throughout  the period  prior to the  Closing,  to the  property,  books,
commitments,  agreements,  records,  files and  personnel  of Seller  and USTMAN
related to USTMAN,  and Seller  shall  furnish to Buyer  during  that period all
copies of documents and  information  concerning the Business of USTMAN as Buyer
may reasonably  request,  subject to applicable law. Buyer shall hold, and shall
cause its counsel, accountants and other agents and representatives to hold, all
such information and documents in confidence. Seller will cooperate with Buyer's
transition planning for the acquisition by providing access to key executives of
Seller and USTMAN.

     Section 6.7 Use of Name.  Prior to or at Closing,  Seller shall  eliminate,
and cease and desist from, any use of any designation  indicating an affiliation
with  USTMAN, and immediately following  Closing, Buyer  shall cause  USTMAN  to

                                      -25-


<PAGE>



eliminate, and cease and desist from, any  use of any  designation indicating an
affiliation with Seller.

     Section 6.8 Other Action. Each of the parties shall use its best efforts to
cause the fulfillment at the earliest  practicable date but, in any event, prior
to the  Closing  Date of all  conditions  to  their  respective  obligations  to
consummate the transactions under this Agreement.

     Section 6.9 Employee  Benefit  Matters.  Effective as of the Closing  Date,
Seller  shall amend all USTMAN Plans  except  stock  options  plans of Seller to
terminate the participation of USTMAN therein,  and shall further amend Seller's
defined contribution USTMAN Plans except stock option plans of Seller to provide
for full vesting of the  accounts of all current and former  employees of USTMAN
participating therein.

     Section 6.10  Cooperation with Financings and Financial  Reporting.  Seller
acknowledges and understands that in the event Buyer conducts certain  offerings
of its  securities  or is subject to reporting  requirements  under the Exchange
Act,  Buyer may be required to obtain  certain  information  relating to Seller,
USTMAN or the  Business,  including,  but not limited to,  audited or  unaudited
financial  statements of USTMAN,  and disclose such  information in registration
statements and other documents filed with the Securities and Exchange Commission
under the federal securities laws or in disclosure  documents given investors in
certain securities offerings. Seller agrees to use its best efforts to cooperate
fully and promptly,  and shall cause its  Affiliates,  accountants,  counsel and
other agents and representatives to cooperate fully and promptly,  with Buyer in
connection therewith.

     Section  6.11  Consents.  Each  party  will  cooperate  with the  other and
proceed, as promptly as is practicable, to seek to obtain all necessary consents
and  approvals  set forth in Schedule  4.4 or Schedule  5.3,  and to endeavor to
comply with all other legal or contractual  requirements for or preconditions to
the execution and consummation of this Agreement.

     Section 6.12 Tax  Certificate.  On or before the Closing Date,  Seller will
provide to Buyer a certificate ("Tax Certificate") that sets forth the following
information as of the date for each particular  item of information  which is as
close to the Closing Date as is reasonably practicable:

          (a) The following information shall be provided in accordance with the
     reporting of such  information  on the most  recently  filed Tax Return for
     each such Tax:

               (i) The adjusted  basis for Tax purposes of the assets of USTMAN,
          and

               (ii) The amounts of the net  operating  loss,  net capital  loss,
          foreign Tax credit and Tax credit carry forwards,  the overall foreign
          losses  and  the  foreign  Taxes  paid or  accrued  in  excess  of the
          applicable foreign Tax credit limitations of or allocable to USTMAN;

          (b) All current  consents  and  elections  with respect to Taxes of or
     with respect to USTMAN that have been filed with any taxing authority;

                                      -26-


<PAGE>



          (c) All taxable periods for which the income and franchise Tax Returns
     of or with respect to USTMAN are open; and

          (d) All Tax partnerships in which USTMAN is a member.

     Section  6.13 Certain Tax  Elections.  Buyer and Seller shall make a timely
and effective joint election (the "Section  338(h)(10)  Election") under Section
338(h)(10)  of the Code for USTMAN with  respect to the  purchase of the Shares.
Moreover,  Buyer shall prepare  completed Forms 8023-A for USTMAN  providing for
the  Section  338(h)(10)  Elections.  If Buyer  and  Seller  disagree  as to any
information  (including but not limited to the valuation of any asset)  required
to be provided on any Form 8023-A (including any schedule attached thereto), the
specific matters in dispute shall be submitted to the Auditors, which firm shall
render its opinion as to such matters.  Based on such opinion,  such independent
accounting  firm will then send to  Seller  and Buyer its  determination  of the
specified matters in dispute,  which determination shall be final and binding on
the parties  hereto.  The parties agree to represent  such  information  on Form
8023-A  consistent  with such  Auditors'  opinion.  The fees and expenses of the
Auditors shall be borne one-half by Seller and one-half by Buyer. At the Closing
Date or as soon as practicable thereafter, Seller and Buyer will jointly execute
such Forms 8023-A,  and thereafter  Buyer,  on behalf of Buyer and Seller,  will
timely  file such Forms  8023-A  with the  relevant  taxing  authority  and will
provide proof of such filing to Seller.

     Section 6.14 Liability for Taxes.

          (a) Seller shall be liable for, and shall  defend,  indemnify and hold
     Buyer  harmless  against,  (i) any Taxes incurred by USTMAN for any taxable
     period ending on or before the Closing  Date,  (ii) any income Taxes caused
     by, or arising from, the Section 338(h)(10) Election, (iii) any transfer or
     sales Taxes arising from the  transactions  contemplated in this Agreement,
     other than transfer or sales Taxes that are imposed  because of the Section
     338(h)(10)  Election  if such Taxes are in excess of the  transfer or sales
     Taxes that would have been imposed if the Section  338(h)(10)  Election had
     not been made,  (iv) any Taxes  imposed  with  respect to any payment  from
     Seller under this sentence and (v) any Taxes for a Consolidated  Group with
     Seller of which USTMAN is determined to be a part. Any Tax refunds received
     by Buyer  relating to the Tax liability of USTMAN for a period ending on or
     before the  Closing  Date shall be the  property  of Seller  other than Tax
     refunds generated because of a Buyer tax attribute. Seller will ensure that
     with  respect to any Tax  partnership  listed on the Tax  Certificate,  the
     appropriate  party has made or will make a valid election under Section 754
     of the Code with  respect to each such Tax  partnership  in the time and in
     the  manner  provided  in  Regulation  ss.  1.754-1(b)  such that each such
     election  is in effect for the  taxable  year of each such Tax  partnership
     that includes the Closing Date.

          (b) Seller shall  prepare,  or cause USTMAN to prepare,  and submit to
     Buyer all Tax  Returns  of USTMAN  (and any Tax  partnerships  in which (i)
     USTMAN owns an interest  and (ii) Seller or USTMAN has  responsibility  for
     preparing  and filing  partnership  Tax  Returns) for Taxes for any taxable
     period  ending on or before the Closing  Date and for which the due date of
     any such Tax Return is subsequent to the Closing Date. Any such Tax Return

                                      -27-


<PAGE>



     shall be prepared on a basis  consistent  with Tax  Returns  prepared  with
     respect to USTMAN for prior taxable periods,  unless otherwise  required by
     law,  and shall be submitted to Buyer not later than (i) in the case of any
     United  States  federal  income Tax Return,  60 days before the due date of
     such Tax  Return,  and (ii) in the case of any  other Tax  Return,  30 days
     before the due date of such Tax Return.  Seller is  responsible  for filing
     any such Tax  Return and for  preparing  and filing any other Tax Return of
     USTMAN for Taxes for any  taxable  period  ending on or before the  Closing
     Date.

          (c) Buyer and its Affiliates,  including  USTMAN,  are responsible for
     preparing  and  filing  with the  appropriate  taxing  authorities  all Tax
     Returns  which relate to the Taxes of USTMAN other than those  described in
     Section  6.14(c),  except that Tax Returns  which relate to a  Post-Closing
     Period shall be completed by Buyer.  Seller shall  cooperate with Buyer and
     shall make  available  all  necessary  records  and timely  take all action
     necessary to allow Buyer to file,  or prepare and file, as the case may be,
     the Tax Returns described in this paragraph (including, without limitation,
     providing  or causing to be provided to Buyer any powers of attorney  which
     Buyer shall request for purposes of filing any such Tax Returns).  Such Tax
     Returns shall be prepared on a basis  consistent  with those  prepared with
     respect to USTMAN for taxable periods ending on or before the Closing Date,
     unless otherwise required by law.

     Section  6.15  Cooperation  and Exchange of  Information.  The parties will
provide each other with such  cooperation and information as they may reasonably
request of each other in preparing or filing any Tax Return,  amended Tax Return
or claim for  refund,  in  determining  a  liability  or a right to refund or in
conducting  any audit or other  proceeding,  in respect of Taxes  imposed on the
parties or their respective Affiliates.  USTMAN and each party will preserve and
retain all Tax Returns,  schedules,  work papers and other documents relating to
any such Tax Returns,  claims,  audits or other proceedings until the expiration
of the statutory  period of  limitations  (including  extensions) of the taxable
periods to which such documents relate and until the final  determination of any
payments which may be required with respect to such periods under this Agreement
and shall  make such  documents  available  to  representatives  of Seller  upon
reasonable  notice  and at  reasonable  times,  it being  understood  that  such
representatives  shall be  entitled to make copies of any such books and records
as they shall deem necessary.  Any information obtained pursuant to this Section
6.15  shall  be kept  confidential,  except  as may be  otherwise  necessary  in
connection  with the filing of Tax Returns or claims for refund or in conducting
any audit or other proceeding.

     Section 6.16 Conflict. In the event of a conflict between the provisions of
Sections 6.12, 6.13, 6.14 or 6.15 and any other provision of this Agreement, the
provisions of this Article VI shall control.

     Section  6.17  Insurance.  Buyer  agrees to procure and  maintain for three
years  after  the  Closing  Date  commercial  general  liability  insurance  and
environmental  liability  insurance  covering  contractors'  legal liability and
professional  errors and omissions  liability  with no pollution  exclusion with
policy terms, conditions, exclusions, limits and deductibles not materially less
favorable  than such  insurance  maintained by Seller,  as described in Schedule
4.20, and shall name Seller as an additional insured.

                                      -28-


<PAGE>



                                   ARTICLE VII
                     Extent and Survival of Representations,
              Warranties, Covenants and Agreements; Indemnification

     Section 7.1 Indemnification of Buyer.

          (a) Subject to and to the extent  provided in Section  7.1(b),  Seller
     agrees  to  defend,  indemnify  and  hold  harmless  Buyer  (including  its
     officers, directors, employees and agents and Affiliates) from and against,
     any and all claims, actions, causes of action,  arbitrations,  proceedings,
     losses, damages,  liabilities,  judgments and expenses (including,  without
     limitation,  reasonable  attorneys' fees) ("Claim")  incurred by Buyer, any
     Affiliate  of  Buyer,  Seller or  USTMAN,  net of the  amount of  insurance
     coverage  required  pursuant to Section 6.18  (regardless  of whether Buyer
     maintains such Insurance), as a result of (i) any error, inaccuracy, breach
     or  misrepresentation  in any of the representations and warranties made by
     or on behalf of Seller in this  Agreement  or in any  certificate  or other
     instrument  delivered  by or on behalf of  Seller in  connection  with this
     Agreement (including the Schedules hereto), (ii) any violation or breach by
     Seller of or default by Seller under the terms of this Agreement, (iii) any
     act or omission occurring, or condition or circumstances existing, prior to
     the  Closing,  or any  condition  or  circumstances  caused  by any  act or
     omission  occurring prior to the Closing,  by Seller or USTMAN or otherwise
     with  respect  to  Seller or  USTMAN,  (iv) the past or  present  presence,
     release,  remediation  or clean-up of, or exposure to,  Hazardous  Material
     relating to or located on, within or under any assets owned, leased or used
     by Seller or USTMAN,  or (v) any product  liability,  strict  liability  or
     other claims concerning (A) products sold or services provided by Seller or
     USTMAN prior to the Closing or (B)  inventory  owned by Seller or USTMAN at
     the Closing.

          (b) The maximum amount of all liability of Seller to Buyer pursuant to
     Section 7.1(a),  other than any liability  arising from any fraudulent acts
     of Seller or in respect of Taxes, shall be as follows:

               (i) In the event of any Claim pursuant to Section 7.1(a)(i) where
          Seller,  at the time of Closing,  had actual knowledge of, and did not
          disclose to Buyer, the error, inaccuracy,  breach or misrepresentation
          giving rise to such Claim,  Seller's  obligation  to  indemnify  Buyer
          shall be unlimited as to amount.

               (ii) In the event of one or more  Claims  pursuant to (A) Section
          7.1(a)(i)  where the error,  inaccuracy,  breach or  misrepresentation
          giving rise to such Claim or Claims existed at the time of the October
          Closing (other than a Claim described in Section 7.1(b)(i) above), (B)
          Section 7.1(a)(iii) where the act or omission giving rise to the Claim
          or Claims occurred,  or the condition or circumstances  existed, at or
          prior  to the  October  Closing,  (C)  Section  7.1(a)(iv)  where  the
          presence,  release,  remediation  or  clean-up  of,  or  exposure  to,
          Hazardous  Material  giving  rise to the Claim or Claims  occurred  or
          existed at or prior to the October  Closing or (D)  Section  7.1(a)(v)
          where the  liability  giving  rise to the Claim or Claims  relates  to
          products sold or services provided by USTMAN prior to the October

                                      -29-


<PAGE>



          Closing (any Claims described in (A) - (D) of this Section  7.1(b)(ii)
          being  referred to as "Prior  Period  Claims"),  then Seller  shall be
          obligated to proceed against TEI in accordance with the procedures set
          forth in Section 7.5 and Seller shall pay to Buyer any and all amounts
          recovered from TEI in connection  with such Prior Period Claim. In the
          event that the amount of the any Prior Period Claim is  determined  in
          accordance  with the procedures set forth in the October  Agreement to
          be subject to indemnification by TEI thereunder and the amount thereof
          is in  excess  of the  indemnification  obligations  of TEI  under the
          October Agreement,  then Seller shall be liable for the amount of such
          excess up to a maximum aggregate amount,  for all Prior Period Claims,
          of $1,000,000.

               (iii) The maximum  amount of liability of Seller to Buyer for any
          Claim not covered by Section  7.1(b)(i)  or (ii),  shall be limited to
          the aggregate amount of $5,750,000.

     Section 7.2  Indemnification of Seller.  Buyer agrees to defend,  indemnify
and hold  harmless  Seller  (including  its officers,  directors,  employees and
agents and Affiliates) from and against,  any and all Claims incurred by Seller,
any  Affiliate  of  Seller,  Buyer  or  USTMAN  as a  result  of (a) any  error,
inaccuracy,  breach  or  misrepresentation  in any of  the  representations  and
warranties made by or on behalf of Buyer in this Agreement or in any certificate
or other  instrument  delivered by or on behalf of Buyer in connection with this
Agreement (including the Schedules hereto), (b) any violation or breach by Buyer
of or  default  by  Buyer  under  the  terms of this  Agreement,  (c) any act or
omission occurring, or condition or circumstances  existing,  after the Closing,
or any condition or circumstances  caused by any act or omission occurring after
the Closing,  by Buyer or USTMAN or  otherwise  with respect to Buyer or USTMAN,
(d) the post-Closing presence, release,  remediation or clean-up of, or exposure
to,  Hazardous  Material  relating to or located on,  within or under any assets
owned,  leased or used by Buyer or USTMAN, or (e) any product liability,  strict
liability or other claims  concerning (i) products sold or services  provided by
Buyer or USTMAN  after the  Closing or (ii)  inventory  owned by Buyer or USTMAN
after the  Closing.  Seller  shall be  entitled to recover  its  reasonable  and
necessary  attorneys' fees and litigation  expenses  incurred in connection with
successful  enforcement of its rights under this Section.  Buyer's obligation to
indemnify  Seller  pursuant to this Section 7.2 shall be unlimited as to time or
amount.

     Section 7.3 Survival.

          (a) The  representations,  warranties  and covenants of Seller in this
     Agreement  and in any  certificate  or  instrument  delivered in connection
     herewith  shall be continuing and shall survive the Closing until two years
     after the Closing  Date (the period  during which the  representations  and
     warranties  shall  survive  being  referred to herein with  respect to such
     representations  and  warranties  as  the  "Survival  Period"),  but  shall
     thereafter terminate and be of no further force and effect unless a written
     notice  asserting a claim shall have been made pursuant to this Article VII
     within the  Survival  Period  with  respect to such  matter.  Any claim for
     indemnification of a Claim of the type set forth in Section 7.1(a)(i)-(iv)

                                      -30-


<PAGE>



     of this  Agreement  made during the Survival  Period shall remain in effect
     for purposes of such indemnification  notwithstanding such Claim may not be
     resolved within the Survival Period.

          (b) Any claim for indemnification of Buyer for a Claim of the type set
     forth in Section  7.1(a)(v)  of this  Agreement  must be made no later than
     three years after the Closing  Date.  Any such Claim shall remain in effect
     for  purposes  of such  indemnification  even if the Claim is not  resolved
     within three years after the Closing Date.

     Section 7.4 Indemnification Procedures.  Subject to Section 7.5, all claims
for  indemnification  under this  Agreement  shall be asserted  and  resolved as
follows:

          (a)  A  party  claiming   indemnification  under  this  Agreement  (an
     "Indemnified Party") shall with reasonable  promptness (i) notify the party
     from whom  indemnification  is sought  (the  "Indemnifying  Party")  of any
     third-party  claim or claims asserted against the Indemnified Party ("Third
     Party Claim") for which  indemnification is sought and (ii) transmit to the
     Indemnifying  Party a copy of all papers  served with respect to such claim
     (if any) and a written notice ("Claim Notice")  containing a description in
     reasonable  detail of the nature of the Third Party  Claim,  an estimate of
     the amount of damages  attributable  to the Third Party Claim to the extent
     feasible  (which  estimate  shall not be  conclusive of the final amount of
     such  claim)  and  the  basis  of  the  Indemnified   Party's  request  for
     indemnification under this Agreement.

          Within 15 days  after  receipt  of any  Claim  Notice  (the  "Election
     Period"), the Indemnifying Party shall notify the Indemnified Party whether
     the Indemnifying Party disputes its potential  liability to the Indemnified
     Party with respect to such Third Party Claim and, if the Indemnifying Party
     does not dispute its  potential  liability  to the  Indemnified  Party with
     respect to such Third Party Claim, whether the Indemnifying Party elects to
     defend the Indemnified Party with respect to such Third Party Claim.

          If the Indemnifying Party does not dispute its potential  liability to
     the  Indemnified   Party  within  the  Election  Period  and  notifies  the
     Indemnified  Party that it elects to defend  such Third  Party  Claim,  the
     Indemnified  Party shall  control  negotiations  toward  resolution of such
     claim without the necessity of  litigation,  and if litigation  ensues,  to
     defend the same with counsel reasonably  acceptable to both parties, at the
     Indemnifying  Party's  expense,  and the  Indemnified  Party  shall  extend
     reasonable  cooperation in connection  with such defense.  The  Indemnified
     Party shall be entitled to elect to participate in, but not to control, the
     defense of any Third Party Claim  resulting in litigation,  at its own cost
     and  expense;  provided,  however,  that  if the  parties  to any  suit  or
     proceeding shall include the Indemnifying  Party as well as the Indemnified
     Party and the Indemnified Party shall have been advised by counsel that one
     or more legal  defenses may be available to it that may not be available to
     the  Indemnifying  Party,  then the Indemnified  Party shall be entitled to
     elect to control such suit or proceeding,  but the Indemnifying Party shall
     be obligated  to bear the fees and  expenses of counsel of the  Indemnified
     Party, which shall be selected by the Indemnified Party in its complete and
     sole discretion.  If the Indemnifying  Party does not dispute its potential
     liability  to the  Indemnified  Party  within the  Election  Period and the
     Indemnified Party fails to assume control of the negotiations prior to

                                      -31-


<PAGE>



     litigation  or  to  defend  such  action  within  a  reasonable  time,  the
     Indemnifying Party shall be entitled, but not obligated,  to assume control
     of such negotiations or defense of such action,  and the Indemnifying Party
     shall be  liable  to the  Indemnified  Party  for its  expenses  reasonably
     incurred or amounts paid in connection therewith. If the Indemnifying Party
     disputes  its  potential  liability  to the  Indemnified  Party  within the
     Election  Period or does not elect to defend such Third Party  Claim,  then
     the  Indemnified  Party  shall  be  entitled  to  assume  control  of  such
     negotiations  or  defense  of  action  and the  liability  for the  expense
     thereof,  as well as any liability  with respect to such Third Party Claim,
     shall be determined as provided in Section 7.6 below.

          If the Indemnifying Party fails to notify the Indemnified Party within
     the  Election  Period  that the  Indemnifying  Party  elects to defend  the
     Indemnified  Party  pursuant  to  the  preceding   paragraph,   or  if  the
     Indemnifying  Party  elects to defend  the  Indemnified  Party but fails to
     prosecute  or settle the Third  Party  Claim as herein  provided,  then the
     Indemnified  Party  shall  have the right to  defend,  at the sole cost and
     expense of the Indemnifying  Party (if the Indemnified Party is entitled to
     indemnification  hereunder),  the  Third  Party  Claim  by all  appropriate
     proceedings,  which proceedings shall be promptly and vigorously prosecuted
     by the Indemnified Party to a final conclusion or settled.  The Indemnified
     Party  shall  have  full   control  of  such   defense   and   proceedings.
     Notwithstanding  the foregoing,  if the Indemnifying  Party has delivered a
     written notice to the Indemnified Party to the effect that the Indemnifying
     Party disputes its potential  liability to the Indemnified Party under this
     Article VII and if such  dispute is  resolved in favor of the  Indemnifying
     Party, the  Indemnifying  Party shall not be required to bear the costs and
     expenses of the Indemnified  Party's defense pursuant to this Section or of
     the Indemnifying Party's  participation  therein at the Indemnified Party's
     request,  and the Indemnified Party shall reimburse the Indemnifying  Party
     in full for all costs and  expenses of such  litigation.  The  Indemnifying
     Party may  participate  in, but not  control,  any  defense  or  settlement
     controlled  by the  Indemnified  Party  pursuant to this  Section,  and the
     Indemnifying  Party shall bear its own costs and  expenses  with respect to
     such participation.

          Neither the Indemnifying Party nor the Indemnified Party shall settle,
     compromise,  or make any other  disposition  of any Third Party Claim which
     would or might  result in any  liability  to the  Indemnified  Party or the
     Indemnifying  Party under this  Article VII without the written  consent of
     such other party.

          (b) In the event any Indemnified Party should have a claim against any
     Indemnifying Party hereunder that does not involve a Third Party Claim, the
     Indemnified Party shall transmit to the Indemnifying Party a written notice
     (the "Indemnity  Notice") describing in reasonable detail the nature of the
     claim,  an estimate of the amount of damages  attributable to such claim to
     the extent  feasible  (which  estimate shall not be conclusive of the final
     amount of such claim) and the basis of the Indemnified  Party's request for
     indemnification  under this Agreement.  If the Indemnifying  Party does not
     notify  the  Indemnified  Party  within  15 days  from its  receipt  of the
     Indemnity Notice that the Indemnifying Party disputes such claim, the claim
     specified by the Indemnified  Party in the Indemnity Notice shall be deemed
     a liability of the Indemnifying Party hereunder.

                                      -32-


<PAGE>



     Section 7.5  Indemnification  Procedures for Prior Period Claims. Any claim
by Buyer for  indemnification in connection with any Prior Period Claim shall be
asserted and resolved as follows:

          (a) Buyer shall  deliver to Seller a Claim Notice or Indemnity  Notice
     as set forth in Section 7.4.

          (b) Within 15 days after  receipt of such notice,  Seller shall notify
     Buyer of  Seller's  determination  that such claim for  indemnification  is
     based  on  a  Prior  Period   Claim.   Unless  Buyer  objects  to  Seller's
     determination  within 10 business days after Seller's notice to Buyer,  the
     claim for  indemnification  shall be  deemed to be based on a Prior  Period
     Claim. If Buyer objects to Seller's  determination,  Seller and Buyer agree
     to promptly  negotiate  in good faith to  determine  whether such claim for
     indemnification  is based on a Prior  Period  Claim.  If the  parties  have
     failed to agree  within  15 days  after the date of  Buyer's  objection  to
     Seller's  determination,  such dispute shall be submitted to arbitration in
     accordance  with Section 7.6. The decision of the arbitrator  regarding the
     classification of the claim as a Prior Period Claim shall be binding on the
     parties.

          (c) Once the parties have determined that a claim for  indemnification
     is based on a Prior Period Claim,  Seller shall promptly  notify TEI of the
     Prior Period Claim in accordance  with the provisions of Section 7.3 of the
     October  Agreement.  Seller covenants and agrees that it shall exercise its
     rights  under the  October  Agreement  as  directed by Buyer and at Buyer's
     expense and shall extend  reasonable  cooperation in connection  therewith.
     With the  exception of the liability of Seller for amounts in excess of the
     limitations on liability of TEI under the October Agreement as described in
     Section  7.1(b)(ii),  Seller shall have no other obligation with respect to
     any  Prior  Period  Claim.  Seller  shall  have  the  right,  but  not  the
     obligation,  to engage  Seller's  own  counsel at  Seller's  own expense to
     participate in the prosecution of any Prior Period Claims against TEI or to
     participate  in the defense of any Third Party Claim against Buyer based on
     a Prior Period Claim.

          (d)  Following  any  recovery  from TEI  pursuant to this Section 7.5,
     Seller shall be obligated to pay an amount equal to the amount of any funds
     received from TEI to Buyer  promptly after receipt  thereof,  together with
     any additional amounts as required by Section 7.1(b)(ii).

     Section 7.6 Arbitration of Disputes.  If the  Indemnifying  Party disputes,
either as to the amount or liability, that any claim described in a Claim Notice
or an  Indemnity  Notice,  as the case may be, is covered  by such  Indemnifying
Party's  covenant  to  indemnify   contained  in  this  Article  VII,  then  the
Indemnifying Party and the Indemnified Party agree to promptly negotiate in good
faith to resolve their differences and to mutually agree upon an amount, if any,
owed to Indemnified Party by the Indemnifying  Party hereunder.  If Indemnifying
Party and Indemnified Party fail to agree within 30 days thereafter, the dispute
shall be  resolved  by  binding  and final  arbitration  of a single  arbitrator
mutually agreed to by Buyer and Seller conducted in Houston, Texas in accordance
with  the  rules  of  commercial   arbitration   of  the  American   Arbitration
Association.  The prevailing party in any such  arbitration  proceeding shall be
entitled to attorneys'  fees and other out-  of-pocket  expenses  reasonably and
necessarily  incurred in connection with such  proceeding,  the amounts of which
shall be contained  in the award of the  arbitrator.  After a final  arbitration
decision  with respect to a Claim by Buyer  against  Seller,  Buyer shall have a
limited right of set off against the Purchase Note.

     Section 7.7 General.  The covenants and agreements entered into pursuant to
this  Agreement  to be  performed  after the Closing  shall  survive the Closing
without limitation. The indemnification obligations under this Article VII shall
apply regardless of whether any Claim results solely or in part from the active,
passive or concurrent  negligence of the Indemnified  Party prior to the Closing
Date.  The parties agree that this Article VII does not entitle  either party to
indemnification  for either  party's act or omission after the Closing Date. All
representations,  warranties  and covenants and  agreements  made by the parties
shall not be deemed  merged into any  instruments  or  agreements  delivered  in
connection  with the Closing or otherwise in  connection  with the  transactions
contemplated hereby.


                                  ARTICLE VIII
                              Conditions to Closing

     Section 8.1 Conditions Precedent to Obligations of Buyer. The obligation of
Buyer to  consummate  the  purchase  under  this  Agreement  is  subject  to the
fulfillment,  prior to or at the Closing,  of each of the  following  conditions
(any or all of which may be waived by Buyer):

          (a) all  representations  and  warranties of Seller  contained in this
     Agreement  including  all  Schedules  to this  Agreement  shall be true and
     correct in all  respects at and as of the time of the Closing with the same
     effect as though made again at, and as of,  that time,  except such as will
     not have a material  adverse effect and except such as would not reasonably
     be  expected  to have a  material  adverse  effect on  Seller's  ability to
     perform its obligations under this Agreement;

          (b) Seller shall have performed and complied in all material  respects
     with  all  obligations  and  covenants  required  by this  Agreement  to be
     performed or complied with by Seller prior to or at the Closing;

          (c) Buyer  shall have been  furnished  with a  certificate,  dated the
     Closing  Date,   executed  by  an  officer  of  Seller  certifying  to  the
     fulfillment  of the  conditions  specified  in  Sections  8.1(a) and 8.1(b)
     hereof;

          (d) no provision of any Applicable Law shall prohibit, and there shall
     not be in effect any  injunction,  restraining  order or decree issued by a
     court  of  competent  jurisdiction  or any  governmental  body  that  shall
     prohibit the consummation of this Agreement and there shall be no action or
     proceeding  pending or  threatened  seeking any such  injunction,  order or
     decree;

                                      -33-


<PAGE>



          (e) Seller shall have received all consents,  approvals and Permits to
     execute this  Agreement and to  consummate  the  transactions  contemplated
     hereby; and

          (f) Buyer shall be furnished  with an opinion of counsel to Seller and
     USTMAN,  as to the due  execution  and delivery of this  Agreement  and the
     documents  delivered  by  Seller at  Closing  and  substantially  as to the
     matters set forth in Sections 4.1, 4.3, 4.4, 4.7 and 4.8 hereof  (qualified
     appropriately  as to  knowledge)  and  such  other  matters  as  Buyer  may
     reasonably request.

     Section 8.2 Conditions  Precedent to Obligations of Seller.  The obligation
of  Seller to  consummate  the sale  under  this  Agreement  is  subject  to the
fulfillment,  prior to or at the Closing,  of each of the  following  conditions
(any or all of which may be waived by Seller):

          (a) all  representations  and  warranties  of Buyer  contained in this
     Agreement,  including  all Schedules to this  Agreement,  shall be true and
     correct in all  respects at and as of the time of the Closing with the same
     effect as though made again at, and as of,  that time,  except such as will
     not have a material  adverse effect and except such as would not reasonably
     be expected to have a material adverse effect on Buyer's ability to perform
     its obligations under this Agreement;

          (b) Buyer shall have  performed and complied in all material  respects
     with  all  obligations  and  covenants  required  by this  Agreement  to be
     performed or complied with by Buyer prior to or at the Closing;

          (c) Seller shall have been  furnished  with a  certificate,  dated the
     Closing Date, executed by an officer of Buyer certifying to the fulfillment
     of the conditions specified in Sections 8.2(a) and 8.2(b) hereof; and

          (d) no provision of any Applicable Law shall prohibit, and there shall
     not be in effect any injunction or  restraining  order issued by a court of
     competent   jurisdiction   in  any  action  or  proceeding   against,   the
     consummation of this Agreement.

          (e) Seller shall be furnished with an opinion of counsel to Buyer,  as
     to the due  execution  and  delivery of this  Agreement  and the  documents
     delivered by Buyer at Closing and substantially as to the matters set forth
     in Sections 5.1,  5.2, 5.3 and 5.6 hereof  (qualified  appropriately  as to
     knowledge)  and such  other  matters  as  Seller  may  reasonably  request,
     including without limitation the authorization, due execution, delivery and
     enforceability of the Purchase Note and the Subsidiary Guarantees.




                                      -34-


<PAGE>



                                   ARTICLE IX
                         Actions to be Taken at Closing

     Section 9.1 Actions to be Taken by Seller at the Closing. Seller shall take
the following actions at the Closing:

          (a) Seller shall deliver to Buyer copies certified by its Secretary of
     resolutions  duly adopted by the board of  directors of Seller  authorizing
     and approving the execution and delivery of this  Agreement,  including the
     exhibits and schedules  hereto,  and the  consummation of the  transactions
     contemplated herein;

          (b) Seller  shall  endorse  and  deliver to Buyer a stock  certificate
     representing the Shares;

          (c) Seller  shall  deliver the  officer's  certificate  referred to in
     Section 8.1(c);

          (d) Buyer shall have been  furnished  with a legal opinion as provided
     in Section 8.1(f) hereof; and

          (e) Seller shall have delivered to Buyer a letter of resignation  from
     each noncontinuing officer and director of USTMAN.

     Section 9.2 Actions to be Taken by Buyer at the  Closing.  Buyer shall take
the following actions at the Closing:

          (a) Buyer shall deliver to Seller a copy certified by its Secretary of
     resolutions duly adopted by the board of directors of Buyer authorizing and
     approving  the  execution  and delivery of this  Agreement,  including  the
     exhibits and schedules  hereto,  and the  consummation of the  transactions
     contemplated herein;

          (b) Buyer  shall make the  payment of funds  specified  for payment at
     Closing under Section 2.2;

          (c) Buyer shall deliver the Purchase Note and the Subsidiary  Guaranty
     to Seller as set forth in Section 2.3;

          (d) Buyer  shall  deliver  the  officer's  certificate  referred to in
     Section 8.2(c); and

          (e) Seller shall have been  furnished with a legal opinion as provided
     in Section 8.2(e).




                                      -35-


<PAGE>



                                   ARTICLE X
                               General Provisions

     Section 10.1 Termination.

          (a) This Agreement may be terminated at any time prior to the Closing:

               (i) by mutual written agreement executed by Seller and Buyer; or

               (ii) if the Board of  Directors  of Seller in the exercise of its
          fiduciary  duties  under  applicable  laws as  advised  in  writing by
          counsel  withdraws or modifies its approval or  recommendation  of the
          proposed  acquisition  of Shares by Buyer on the terms and  conditions
          set forth  herein in any  manner  adverse to Buyer and  recommends  or
          approves a Competing Transaction, or resolves to do the foregoing. For
          purposes of this  Agreement,  "Competing  Transaction"  shall mean any
          merger, consolidation, share exchange, business combination or similar
          transaction  involving  USTMAN,  or the  acquisition  in  any  manner,
          directly  or  indirectly,   of  a  material  interest  in  any  voting
          securities of, or a material interest in a substantial  portion of the
          assets of, USTMAN,  other than the  transactions  contemplated by this
          Agreement.

          (b) Upon termination of this Agreement, neither of the parties nor any
     other person shall have any liability or further  obligation arising out of
     this Agreement  except for any liability  resulting from its breach of this
     Agreement  prior to termination  and as stated in Section  10.1(c)  hereof,
     except that the  provisions of Sections  10.2,  10.3,  10.9 and 10.11 shall
     continue to apply.

          (c) In the event Seller terminates this Agreement  pursuant to Section
     10.1(a)(ii)  hereof and enters into a Competing  Transaction,  Seller shall
     reimburse  Buyer for its  reasonable  costs  related  to  Buyer's  proposed
     acquisition of the Shares, not to exceed $250,000.

     Section 10.2 Confidentiality; Publicity; Books and Records.

          (a)  Neither  party  nor  any  Affiliate  thereof  will,  directly  or
     indirectly,  disclose  or  provide  to  any  other  person  any  non-public
     information  of a confidential  nature  concerning the other party or their
     business or operations,  and neither Seller nor any Affiliate  thereof will
     directly  or  indirectly,  disclose  or  provide  to any other  person  any
     non-public  information of a confidential  nature  concerning USTMAN or its
     business or operations,  except as is required in  governmental  filings or
     judicial,  administrative or arbitration  proceedings.  In the event that a
     party or its  Affiliate  becomes  legally  required  to  disclose  any such
     information  in any  governmental  filings or judicial,  administrative  or
     arbitration  proceedings,  that party shall, and shall cause such Affiliate
     to, provide the other party with prompt notice of such  requirement so that
     the other party may seek a protective order or other appropriate remedy. In
     the  event that such  protective order or other remedy is not obtained, the

                                      -36-


<PAGE>



     disclosing  party shall,  and shall cause such  Affiliate to,  furnish only
     that  portion  of  the  information  that  the  disclosing  party  or  such
     Affiliate,  as the  case may be,  is  advised  by its  counsel  is  legally
     required and such  disclosure  shall not result in any liability  hereunder
     unless such disclosure was caused by or resulted from a previous disclosure
     by the other  party  which was not  permitted  by this  Agreement,  by that
     certain Confidentiality  Agreement between the parties dated as of November
     19,  1996.   Subject  to  applicable   securities  law  or  stock  exchange
     requirements,  the parties  hereto  will  promptly  advise,  and obtain the
     approval  of, the other  parties  before  issuing  any press  release  with
     respect to this Agreement or the transactions contemplated hereby.

          (b)  If  the  parties  fail  to  close  the   acquisition   of  Shares
     contemplated  in this  Agreement,  each party  shall,  and shall  cause its
     officers,   directors,   employees,   representatives   and   agents   (the
     "Representatives")  to return all copies of the other party's  confidential
     non- public  information  in its  possession  or in the  possession  of its
     Representatives,  and  destroy  all copies of any  analyses,  compilations,
     studies or other documents prepared by that party or its Representatives or
     for its use containing or reflecting any such information.

          For  purposes  of  this   Agreement,   non-public   information  of  a
     confidential nature shall not include any information which (i) at the time
     of  disclosure  or  thereafter  is generally  available to and known by the
     public (other than as a result of a disclosure  directly or indirectly by a
     party, its Affiliate or its Representatives), (ii) was available to a party
     on a  nonconfidential  basis from a source other than the other party,  its
     Affiliate or Representatives,  provided that such source is not and was not
     directly  or  indirectly  bound  by a  confidentiality  agreement  with the
     nondisclosing  party, its Affiliate or Representatives with respect to that
     information  or (iii) has been  independently  acquired or developed by the
     other  party,  its  Affiliate or  Representatives,  without  violating  any
     obligations under this agreement,  that certain  Confidentiality  Agreement
     between the parties dated as of November 19, 1996.

          (c) For a period of five  years  after the  Closing  Date,  Buyer will
     preserve and retain the books and records of USTMAN and make such books and
     records available at the then current administrative  headquarters of Buyer
     to Seller and its officers,  employees and agents,  upon reasonable  notice
     and at reasonable times, at Seller's cost and expense,  it being understood
     that Seller  shall be entitled to make copies of any such books and records
     as shall be reasonably necessary.

     Section  10.3  Expenses.  Buyer and Seller  shall pay their own  respective
expenses,  including the fees and  disbursements of their respective  counsel in
connection with the negotiation, preparation and execution of this Agreement and
the consummation of the transactions contemplated herein.

     Section 10.4 Entire Agreement. This Agreement,  including all schedules and
exhibits hereto,  constitutes the entire agreement of the parties and supersedes
any prior oral or written  agreements with respect to the subject matter hereof,
and may not be modified,  amended or terminated  except by a written  instrument
specifically referring to this Agreement signed by all the parties hereto.

                                      -37-


<PAGE>



     Section 10.5 Waivers and Consents. All waivers and consents given hereunder
shall be in writing.  No waiver by any party hereto of any breach or anticipated
breach of any  provision  hereof by any other  party shall be deemed a waiver of
any other contemporaneous, preceding or succeeding breach or anticipated breach,
whether or not similar.

     Section 10.6 Notices. All notices and other communications  hereunder shall
be in  writing  and shall be deemed to have been  received  only if and when (a)
personally  delivered (b) if mailed,  on the third day after mailing,  by United
States mail,  first class,  postage prepaid,  by certified mail,  return receipt
requested, addressed in each case as follows (or to such other address as may be
specified by like notice) or (c) delivered by overnight courier or facsimile:

                         (i)        if to Buyer, to:
                                    Watson General Corporation
                                    32-B Mauchly
                                    Irvine, California  92718
                                    Facsimile: 714-753-7986
                                    Attention: President

                         (ii)       if to Seller, to:
                                    NDE Environmental Corporation
                                    8900 Shoal Creek Blvd., Bldg. 200
                                    Austin, Texas 78758
                                    P.O. Box 140795
                                    Austin, Texas 78714
                                    Facsimile: 512-459-1459
                                    Attention: President

     Section 10.7  Successors and Assigns.  This Agreement shall be binding upon
and shall  inure to the  benefit  of the  parties  hereto  and their  respective
successors,  legal  representatives  and assigns.  No third party shall have any
rights hereunder.

     Section 10.8 Performance.  Seller agrees to cause USTMAN to perform all its
obligations   and  agreements   under  this  Agreement  and  hereby   guarantees
performance by USTMAN of all such obligations and agreements.

     Section  10.9 Choice of Law;  Section  Headings;  Table of  Contents.  This
Agreement  shall be governed by the internal laws of the State of Texas (without
regard to the choice of law provisions  thereof).  The section  headings and any
table of contents  contained in this  Agreement are for reference  purposes only
and shall not affect the meaning or interpretation of this Agreement.

     Section 10.10 Counterparts. This Agreement may be executed in any number of
counterparts,  each of which shall be deemed to be an original  and all of which
together shall be deemed to be one and the same instrument.


                                      -38-


<PAGE>


     Section 10.11  Jurisdiction  and Venue.  Seller and Buyer hereby consent to
personal  jurisdiction  in any action brought with respect to this Agreement and
the transactions  contemplated hereunder in any federal or state court in Harris
County, Texas and agree that service of process may be accomplished  pursuant to
Section 10.6 above.

     Section  10.12  Severability.  The  invalidity or  unenforceability  of any
provision of this Agreement shall not affect the validity or  enforceability  of
any other  provision  of this  Agreement  which  shall  remain in full force and
effect.

     Section 10.13 Assignment.  This Agreement and each party's rights hereunder
may not be assigned  without  the prior  written  consent of the other  parties;
provided that no such consent shall be required by Buyer or Seller to assign all
or part of its  rights to  USTMAN  or  Affiliate  but no such  assignment  shall
relieve the assigning party of any of its obligations under this Agreement.

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

                                    WATSON GENERAL CORPORATION



                                    By:      /S/ RONALD G. CRANE
                                        _____________________________________
                                        Ronald G. Crane
                                        President and Chief Executive Officer




                                    NDE ENVIRONMENTAL CORPORATION




                                    By:      /S/ JAY ALLEN CHAFFEE
                                        _____________________________________
                                        Jay Allen Chaffee
                                        Chairman of the Board of Directors








                                      -39-


                                                                    Exhibit 99.1

FOR IMMEDIATE RELEASE

NDE ENVIRONMENTAL ("TANKNOLOGY-NDE") REPORTS FIRST QUARTER LOSS
AND SALE OF USTMAN SUBSIDIARY

     AUSTIN,  Texas, May 27, 1997 - NDE Environmental  Corporation ("NDE" d.b.a.
"Tanknology-NDE",  NASDAQ OTC  Bulletin  Board:  NDEC),  a leading  provider  of
storage tank environmental compliance services, today reported a $1,029,755 loss
for the  quarter  ended  March 31,  and the sale of its USTMAN  Industries  Inc.
subsidiary to Watson General Corporation (NASDAQ: WGEN).

     NDE  revenues  for the three  months  ended March 31, 1997 were  $7,462,643
compared to  $2,562,367  for the three months  ended March  31,1996  period,  an
increase of $4,900,276,  or 191%. The increase in revenues over last year is due
to the  inclusion  of the UST Group of  Companies  acquired on October  25,1996.
Revenues in the first  quarter of 1997 also  included  $117,169 of revenues from
the Company's Canadian  operations that were sold on February 20, 1997. Revenues
of the UST Group  plus  those of the  Company,  excluding  Canadian  operations,
increased  from  $7,124,133  in the first  quarter of 1996 to  $7,354,474 in the
first quarter of 1997 primarily due to the sale of several SIR software licenses
by  the  Company's  USTMAN  subsidiary.  The  company  incurred  a net  loss  of
$1,029,755  for the first  quarter of 1997,  compared  to a loss of  $901,999 in
1996,  an  increase of  $127,756  or 14%.  The net loss for the  current  period
includes $453,982 of non-cash charges directly related to the acquisition of the
UST Group with no prior year counterpart.

     The Company's USTMAN Industries Inc.  subsidiary was sold to Watson General
Corporation on May 22 for a $5,250,000  cash payment and an 8% note for $500,000
due in one year. The sale  agreement also provides for an additional  payment to
NDE relating to a post-closing  adjustment  based upon certain  working  capital
calculations.   USTMAN  provides  Statistical  Inventory   Reconciliation  (SIR)
services  that  allow  tank  owners  to  meet  UST  leak  detection   compliance
regulations in many states. Watson General also provides SIR services.


<PAGE>


NDE ENVIRONMENTAL ("TANKNOLOGY-NDE") - Page 2

     Tanknology-NDE  provides  environmental  compliance  testing and  services,
installation of compliance equipment,  and consulting to owners and operators of
aboveground and underground storage tanks ("USTs").  Tanknology-NDE operates the
largest  national fleet of UST field service and testing vehicles and provides a
complete line of compliance  management services to ensure customers comply with
federal, state, and local regulations governing underground storage tanks.


NDE Environmental Corporation (d.b.a. "Tanknology-NDE")
Financial Highlights (unaudited)

Quarter ended March 31,            (a)1997           1996
- -------------------------------  -------------  --------------
Revenues                        $   7,462,643   $   2,562,367
Net Loss                           (1,029,755)       (901,999)
Average shares outstanding         15,978,610       2,403,722
Loss per share                  $        (.06)  $        (.38)


(a) Includes the results of the UST Group of companies acquired in October 1996.


CONTACT: Amy Graham, Investor Relations, Tanknology-NDE, (512) 451-6334.


                                                                    Exhibit 99.2
                                 AMENDMENT NO. 2
                                       TO
                                 LOAN AGREEMENT
                             DATED OCTOBER 25, 1996
                  BY AND BETWEEN NDE ENVIRONMENTAL CORPORATION,
              TANKNOLOGY/NDE CORPORATION, USTMAN INDUSTRIES, INC.,
                 PROECO, INC. AND TANKNOLOGY CANADA (1988) INC.
                                       AND
                              BANK ONE, TEXAS, N.A.


     This Amendment No. 2 to Loan Agreement dated as of the 25th day of October,
1996, (this "Second  Amendment") by and among NDE ENVIRONMENTAL  CORPORATION,  a
Delaware  corporation,  TANKNOLOGY/  NDE  CORPORATION,  a Delaware  corporation,
USTMAN  INDUSTRIES,  INC.,  a Delaware  corporation,  PROECO,  INC.,  a Delaware
corporation,  and TANKNOLOGY CANADA (1988) INC., a Canadian federal  corporation
(collectively,  "Borrower")  and BANK  ONE,  TEXAS,  N.A.,  a  national  banking
association (the "Bank") is entered into this 20th day of May, 1997.

                              W I T N E S S E T H:

     Borrower has requested that Bank (i) release certain Collateral required in
connection  with the sale of intellectual  property  rights  associated with the
Canadian  operations  of  Borrower  pursuant  to  that  certain  Asset  Purchase
Agreement  dated as of February 19, 1997, by and between  Precision Tank Testing
Limited,  Tanknology  Canada  (1988) Inc.,  NDE  Environmental  Corporation  and
Tanknology/NDE Corporation;  (ii) release Collateral owned by USTMAN Industries,
Inc.;  (iii)  release  all of the  issued and  outstanding  shares of the common
capital stock of USTMAN Industries,  Inc. owned by NDE Environmental Corporation
(being 1,000  shares of common  stock,  par value $0.01 per share,  evidenced by
Certificate  No. 1, which was  reissued  as  Certificate  No. 3); and (iv) waive
Borrower's non-compliance with certain covenants therein; and Bank is willing to
do so in accordance  with,  and subject to, the terms and  conditions  set forth
herein.

     NOW, THEREFORE, in consideration of the promises herein contained, and each
intending to be legally bound hereby, the parties agree as follows:

I. Amendments to Loan Agreement.

          Release of USTMAN Industries,  Inc. USTMAN Industries,  Inc. is hereby
     released from liability and its Obligations  under the Loan Agreement,  the
     Notes and the Collateral Documents and shall no longer have any right under
     any of the foregoing.

          Article  I,   DEFINITIONS,   is   amended  by  adding  the   following
     definitions:

               "Assignment  of Note" shall mean that certain  Assignment of Note
          of even date herewith  made by and between  Borrower and Bank pledging
          the Watson Note in favor of Bank.

               "Canadian  Sale"  shall mean the sale of  intellectual  and other
          property rights associated with the Canadian operations of Borrower to
          Precision Tank Testing Limited pursuant to that certain Asset Purchase
          Agreement dated as of February 19, 1997, by and between Precision Tank
          Testing Limited, Tanknology Canada (1988) Inc., NDE Environmental
          Corporation and Tanknology/NDE Corporation.

               "Certificate  of Deposit"  shall mean  Certificate of Deposit No.
          1698004221  maintained with Bank in the amount of $3,000,000 and being
          more particularly described in the Pledge of Certificate of Deposit.

               "Consent  and  Agreement"  shall mean that  certain  Consent  and
          Agreement of even date  herewith  made by and between  Watson  General
          Corporation and Bank whereby Watson General Corporation,  a California
          corporation, consents to the assignment of the Watson Note to Bank.

               "Excess  Sales  Proceeds"  shall  mean that  portion of the sales
          proceeds from the USTMAN Sale in excess of (i) the $3,000,000 utilized
          for the purchase of the  Certificate  of Deposit and (ii) the expenses
          paid in connection with the USTMAN Sale.

               "Pledge of Certificate of Deposit" shall mean that certain Pledge
          of  Certificate  of Deposit of even date  herewith made by and between
          Borrower and Bank pledging  Certificate  of Deposit No.  1698004221 in
          the amount of $3,000,000 and being maintained with Bank.

               "Second  Amendment" means Amendment No. 2 to this Loan Agreement,
          executed by Borrower and Bank on May 20, 1997.

               "Term Loan Repayment  Reserve" shall have the meaning  attributed
          to that term in Section 2.01(C).

               "USTMAN Sale" means the sale of all of the outstanding  shares of
          common  stock of  USTMAN,  Inc.,  a  wholly  owned  subsidiary  of NDE
          Environmental  Corporation,  to Watson General Corporation pursuant to
          that certain Stock Purchase Agreement dated as of May 20, 1997, by and
          between Watson General Corporation as Buyer and NDE Environmental
          Corporation as Seller.

               "Watson  Note"  shall mean that  certain  promissory  note in the
          original  amount of $500,000 of even date  herewith and payable to the
          order of NDE Environmental  Corporation (together with all extensions,
          renewals and modifications thereof and/or substitutions therefor).

          Article I,  DEFINITIONS,  is further amended by deleting "USTMAN" from
     the definition of "Pledged Stock".

          Section  2.01,  Revolving  Loan,  is amended  by adding the  following
     paragraph at the end of such Section:

               (C)  Notwithstanding  anything  contained herein to the contrary,
          effective  as of the date of the  Second  Amendment,  $500,000  of the
          Revolving  Commitment  shall be  reserved  for the funding of the Term
          Loan Repayment Reserve and will be otherwise  unavailable for advances
          to Borrower.  The Term Loan  Repayment  Reserve  shall remain in force
          through  and until  April  30,  1998,  being  thirty  (30) days  after
          Borrower  is  obligated  to deliver to Bank annual  audited  Financial
          Statements  of Borrower for fiscal year 1997 pursuant to Section 5.04,
          below, and the accompanying  Compliance  Certificate (the "Fiscal Year
          1997  Compliance  Certificate")  delivered  pursuant to Section  5.05,
          below.  In the event that Borrower is in default of the Loan Agreement
          based on the Fiscal Year 1997 Compliance Certificate,  Bank shall have
          the  right  to fund the  Term  Loan  Repayment  Reserve  by  advancing
          $500,000 under the Revolving Note and using to reduce the Term Loan by
          a like amount.  In the event that Borrower is in  compliance  with the
          Loan Agreement based on the Fiscal Year 1997  Compliance  Certificate,
          the Term Loan  Repayment  Reserve shall expire and Borrower shall have
          full access to the Revolving  Commitment  in accordance  with the Loan
          Agreement.

          Schedule  1.01(a),  Collateral,  is hereby amended by deleting "USTMAN
     Industries,  Inc." from line (a) under NDE Environmental Corporation and by
     adding to the end of line (b) the following:  "and Pledged  Certificates of
     Deposit".

          Schedule  1.01(a),  Collateral,  is hereby further amended by deleting
     the parenthetical in line (g) under  Tanknology/NDE  Corporation so that it
     reads as follows: "(g) Patents".

          Schedule  1.01(a),  Collateral,  is hereby further amended by deleting
     the following from Schedule 1.01(a):

         USTMAN Industries, Inc.
                  (a)      Accounts Receivable
                  (b)      Bank Accounts
                  (c)      Inventory
                  (d)      Furniture and Office Equipment
                  (e)      Proprietary Software
                  (f)      Licensing Agreements

II. Certain Waivers. Bank hereby waives non-compliance by the Borrower with
the covenants set forth in Sections 6.03,  6.04 and 8.13 of the Loan  Agreement,
but only to the extent that such non-compliance was the result of the Borrower's
performance  of its  contractual  obligations  in the  Canadian  Sale and/or the
USTMAN  Sale.  Bank  further  waives  non-compliance  by the  Borrower  with the
covenants  set forth in Sections  6.02 of the Loan  Agreement,  insofar and only
insofar as such  covenants  would apply to the set-off  provisions of the Watson
Note.  Notwithstanding anything that may be contained herein to the contrary, no
waiver or any other provision contained herein shall serve to subordinate any of
Borrower's  Obligations  to Bank to any of Borrower's  Obligations  to any third
party.

III. Release of Collateral Pursuant to the Second Amendment. As a condition
to the release of  Collateral  made by Bank  pursuant to this Second  Amendment,
that at or  before  closing  of the  USTMAN  Sale  Borrower  has  satisfied  the
following conditions:

               (a) That the Canadian  Sale was  completed on or before  February
          28, 1997.

               (b) That a minimum of  $500,000  of the sales  proceeds  from the
          Canadian  Sale be  applied  against  the  outstanding  balance  of the
          Revolving Loan to the extent that such outstanding balance is equal to
          or exceeds $500,000.

               (c) That $3,000,000 of the sales proceeds from the sale of USTMAN
          is wired  directly  to Bank for the  purchase  of the  Certificate  of
          Deposit.

               (d)  That  the  lesser  of  the  Excess  Sales  Proceeds  or  the
          outstanding  balance of the Revolving  Note is wired  directly to Bank
          for the payment  against the balance of the Revolving Note. Any Excess
          Sales Proceeds in excess of the balance of the Revolving Note shall be
          paid to NDE Environmental Corporation.

               (e) That NDE Environmental  Corporation  endorse the Watson Note:
          "PAY TO THE ORDER OF BANK ONE,  TEXAS,  N.A." and  deliver  the Watson
          Note to Bank.

               (f) That  NDE  Environmental  Corporation  deliver  the  executed
          Assignment of Promissory Note to Bank.

               (g) That Watson General Corporation has executed and delivered to
          Bank the Consent and Agreement.

               (h) That evidence satisfactory to Bank of all requisite corporate
          authorizations  of the  transactions  contemplated  hereby  have  been
          delivered by Borrower or Watson General Corporation, as applicable.

               (i) That  Borrower  has paid  both (x) all  outstanding  fees and
          expenses  previously  billed  by  Bank's  legal  counsel  and  (y) the
          $3,000.00 advance against fees and expenses anticipated to be incurred
          in the preparation of this Second Amendment (and other Loan Documents)
          requested by Bank's legal counsel.

IV.  Reaffirmation  of  Representations  and Warranties.  To induce Bank to
enter into this Second  Amendment,  Borrower  hereby  reaffirms,  as of the date
hereof, its representations  and warranties  contained in Article IV of the Loan
Agreement and in all other documents executed pursuant thereto, and additionally
represents and warrants as follows:

               A. The  execution  and delivery of this Second  Amendment and the
          performance by Borrower of its obligations under this Second Amendment
          are  within  the  Borrower's   power,   have  received  all  necessary
          governmental approval (if any shall be required),  and do not and will
          not  contravene  or  conflict  with  any  provision  of  law or of any
          agreement binding upon the Borrower.

               B.  The  Loan  Agreement  as  amended  by this  Second  Amendment
          represents  the legal,  valid and  binding  obligations  of  Borrower,
          enforceable against Borrower in accordance with their respective terms
          subject   as  to   enforcement   only   to   bankruptcy,   insolvency,
          reorganization,   moratorium  or  other  similar  laws  affecting  the
          enforcement of creditors' rights generally.

               C. No Event of Default or Unmatured Event of Default has occurred
          and is continuing as of the date hereof.

V.  Defined  Terms.  Except as amended  hereby,  terms used herein that are
defined in the Loan Agreement shall have the same meanings herein.

VI. Reaffirmation of Loan Agreement.  This Second Amendment shall be deemed
to be an amendment to the Loan  Agreement,  and the Loan  Agreement,  as amended
hereby,  is hereby  ratified,  approved and confirmed in each and every respect.
All  references  to  the  Loan  Agreement  herein  and in  any  other  document,
instrument,  agreement or writing shall hereafter be deemed to refer to the Loan
Agreement as amended hereby.

VII. Entire Agreement. The Loan Agreement, as hereby amended,  embodies the
entire agreement  between Borrower and Bank, and supersedes all prior proposals,
agreements and  understandings  relating to the subject matter hereof.  Borrower
certifies  that  it is  relying  on no  representation,  warranty,  covenant  or
agreement except for those set forth in the Loan Agreement as hereby amended and
the other documents previously executed or executed of even date herewith.

VIII.  Governing  Law.  THIS  SECOND  AMENDMENT  SHALL BE  GOVERNED  BY AND
CONSTRUED IN ACCORDANCE  WITH THE LAWS OF THE STATE OF TEXAS AND THE  APPLICABLE
LAWS OF THE UNITED  STATES OF AMERICA.  This Second  Amendment  has been entered
into in Harris County,  Texas,  and it shall be performable  for all purposes in
Harris County,  Texas.  Courts within the State of Texas shall have jurisdiction
over any and all disputes between  Borrower and Bank,  whether in law or equity,
including,  but not limited to, any and all disputes  arising out of or relating
to this  Second  Amendment  or any other  Loan  Document;  and venue in any such
dispute whether in federal or state court shall be laid in Harris County, Texas.

IX. Severability. Whenever possible each provision of this Second Amendment
shall  be  interpreted  in  such  manner  as to be  effective  and  valid  under
applicable  law,  but if  any  provision  of  this  Second  Amendment  shall  be
prohibited  by  or  invalid  under  applicable  law,  such  provision  shall  be
ineffective  to  the  extent  of  such   prohibition   or  invalidity,   without
invalidating the remainder of such provision or the remaining provisions of this
Second Amendment.

X. Execution in Counterparts.  This Second Amendment may be executed in any
number of counterparts  and by the different  parties on separate  counterparts,
and each  such  counterpart  shall be  deemed  to be an  original,  but all such
counterparts shall together constitute but one and the same agreement.

XI. Section  Captions.  Section  captions used in this Second Amendment are
for convenience of reference only, and shall not affect the construction of this
Second Amendment.

XII.  Successors and Assigns.  This Second  Amendment shall be binding upon
the Borrower and Bank and their  respective  successors  and assigns,  and shall
inure to the benefit of the Borrower and Bank, and the respective successors and
assigns of Bank.

XIII.  Non-Application  of Chapter 15 of Texas Credit Codes. The provisions
of Chapter 15 of the Texas Credit Code (Vernon's Texas Civil  Statutes,  Article
5069-15) are specifically declared by the parties hereto not to be applicable to
the Loan  Agreement as hereby  amended or any of the other Loan  Documents or to
the transactions contemplated hereby.

XIV. Notice. THIS SECOND AMENDMENT TOGETHER WITH THE LOAN AGREEMENT AND THE
OTHER LOAN DOCUMENTS  REPRESENT THE FINAL AGREEMENT  BETWEEN THE PARTIES AND MAY
NOT BE  CONTRADICTED  BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS  OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL  AGREEMENTS  BETWEEN THE
PARTIES.

     IN WITNESS WHEREOF, the parties hereto have caused this Second Amendment to
be duly executed as of the day and year first above written.

                              BORROWER:

                                   NDE ENVIRONMENTAL CORPORATION


                                   By:  /S/ JAY ALLEN CHAFFEE
                                      ________________________________
                                       Jay Allen Chaffee
                                       Chairman of the Board

                                   TANKNOLOGY/NDE CORPORATION


                                   By:  /S/ JAY ALLEN CHAFFEE
                                      ________________________________
                                       Jay Allen Chaffee
                                       Chairman of the Board

                                   USTMAN INDUSTRIES, INC.


                                   By:  /S/ JAY ALLEN CHAFFEE
                                      ________________________________
                                       Jay Allen Chaffee
                                       Chairman of the Board

                                  PROECO, INC.


                                   By:  /S/ JAY ALLEN CHAFFEE
                                      ________________________________
                                       Jay Allen Chaffee
                                       Chairman of the Board

                                   TANKNOLOGY CANADA (1988) INC.


                                   By:  /S/ JAY ALLEN CHAFFEE
                                       ________________________________
                                       Jay Allen Chaffee
                                       President


                              BANK:

                                   BANK ONE, TEXAS, N.A.


                                   By:   /S/ CHARLES KINGSWELL-SMITH
                                       ________________________________
                                       Charles Kingswell-Smith
                                       Vice President



                                                                    Exhibit 99.3

NOTICE OF FINAL AGREEMENT

TO:      NDE Environmental Corporation            USTMAN Industries, Inc.
         Tanknology/NDE Corporation               12265 Bayaud Avenue
         ProEco, Inc.                             Lakewood, Colorado 80225
         Tanknology Canada (1988) Inc.
         8900 Shoal Creek, Bldg. 200
         Austin, Texas 78757

         (collectively, whether one or more, "Borrower")

     As of the effective date of this Notice, Borrower and BANK ONE, TEXAS, N.A.
("Bank") have  consummated  a  transaction  pursuant to which Bank has agreed to
make a loan or loans to Borrower,  or to renew, extend or amend an existing loan
or loans to Borrower,  with a Borrowing  Base equal to the amount  determined in
accordance with the Borrowing Base Certificate, the form of which is attached as
Exhibit "G" to the Written Loan  Agreement  dated  October 25,  1996),  which is
comprised of a revolving loan in the amount of $5,000,000 and a term loan in the
amount of $6,000,000 (collectively, the "Loan").

     In connection with the Loan,  Borrower and Bank and other obligors,  if any
(collectively,  whether  one  or  more,  "Other  Obligors")  have  executed  and
delivered   certain   agreements,   instruments   and  documents   (collectively
hereinafter referred to as the "Written Loan Agreement").

     It is the intention of Borrower,  Bank and Other  Obligors that this Notice
be  incorporated by reference into each of the written  agreements,  instruments
and documents  comprising the Written Loan Agreement.  Borrower,  Bank and Other
Obligors  each  warrants  and  represents  that the  entire  agreement  made and
existing by or among Borrower,  Bank and Other Obligors with respect to the Loan
is contained  within the Written  Loan  Agreement,  as amended and  supplemented
hereby,  and that no  agreements  or promises  have been made by, or exist by or
among,  Borrower,  Bank and Other Obligors that are not reflected in the Written
Loan Agreement.

     THE WRITTEN  LOAN  AGREEMENT  REPRESENTS  THE FINAL  AGREEMENT  BETWEEN THE
PARTIES AND MAY NOT BE  CONTRADICTED BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS,  OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.

     THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.


Effective Date:  May 20, 1997.


                                   BANK ONE, TEXAS, NATIONAL ASSOCIATION


                                   By:     /S/ CHARLES KINGSWELL-SMITH
                                        ___________________________________
                                        Charles Kingswell-Smith
                                        Vice President



ACKNOWLEDGED AND AGREED:


Borrower:

NDE ENVIRONMENTAL CORPORATION


By:  /S/ JAY ALLEN CHAFFEE
   ________________________________
   Jay Allen Chaffee
   Chairman of the Board


TANKNOLOGY/NDE CORPORATION


By:  /S/ JAY ALLEN CHAFFEE
   ________________________________
   Jay Allen Chaffee
   Chairman of the Board


USTMAN INDUSTRIES, INC.


By:  /S/ JAY ALLEN CHAFFEE
   ________________________________
   Jay Allen Chaffee
   Chairman of the Board


PROECO, INC.


By:  /S/ JAY ALLEN CHAFFEE
   ________________________________
   Jay Allen Chaffee
   Chairman of the Board


TANKNOLOGY CANADA (1988) INC.


By:  /S/ JAY ALLEN CHAFFEE
   ________________________________
   Jay Allen Chaffee
   President



                                                                    Exhibit 99.4
                        PLEDGE OF CERTIFICATE OF DEPOSIT


     This Pledge of  Certificate  of Deposit is entered into  effective  May 20,
1997, by and between BANK ONE, TEXAS, N.A., a national banking association,  910
Travis,   Houston,   Texas  77002  ("Secured   Party")  and  NDE   ENVIRONMENTAL
CORPORATION, a Delaware corporation ("Pledgor").

     SECTION  1.  PLEDGE  AND   SECURITY   INTEREST.   For  good  and   valuable
consideration,  the receipt and  sufficiency  of which are hereby  acknowledged,
including,  without  limitation,  those  certain  loans made by Secured Party to
Pledgor and others  pursuant to that certain Loan Agreement dated as of the 25th
day of October,  1996, by and among NDE  ENVIRONMENTAL  CORPORATION,  a Delaware
corporation,   TANKNOLOGY/NDE   CORPORATION,  a  Delaware  corporation,   USTMAN
INDUSTRIES, INC., a Delaware corporation,  PROECO, INC., a Delaware corporation,
and TANKNOLOGY CANADA (1988) INC., a Canadian federal corporation (collectively,
"Borrower"), and BANK ONE, TEXAS, N.A., as amended (the "Loan Agreement") in the
original  amount of a Revolving  Line of Credit of up to  $5,000,000  and a Term
Loan of  $6,000,000,  as evidenced by those  certain notes (the "Notes") of even
effective date therewith,  executed by Borrower, payable to the order of Secured
Party,  Pledgor has  pledged  and  granted  and does hereby  pledge and grant to
Secured Party a security  interest in and agrees and  acknowledges  that Secured
Party  has and shall  continue  to have a  security  interest  in the  following
described property (the "Collateral"), to wit:

     Certificate  of  Deposit  No.   1698004221  in  the  amount  of  $3,000,000
maintained with Secured Party.

     Debtor  agrees to endorse  such  instruments  and execute  such  additional
pledge  agreements  or other  documents  as may be required by Secured  Party in
order to  effectively  grant to  Secured  Party  the  security  interest  in the
Collateral.

     SECTION 2. OBLIGATIONS.  The pledge and security interest granted hereby is
to secure (a) the payment of the Notes and any and all renewals, amendments, and
modifications thereof, and (b) the performance of all of obligations of Borrower
under  the  Loan  Agreement  (all of the  foregoing,  and any and all  renewals,
extensions and rearrangements thereof, hereinafter called the "Obligations").

     SECTION 3. EVENTS OF DEFAULT.  The occurrence of any "Event of Default" (as
defined in the Loan Agreement) shall constitute an Event of Default hereunder.

     SECTION 4.  REMEDIES OF SECURED  PARTY.  Upon the happening of any Event of
Default specified herein,  the Secured Party may, at its sole discretion,  apply
the Collateral to any amounts owing from Borrower to Secured Party,  pursuant to
the  Obligations;  and Secured Party may exercise any other rights  available to
Secured Party under any instrument securing the Obligations, or under applicable
law.

     SECTION 5. MISCELLANEOUS.

          A. No delay or omission on the part of Secured Party in exercising any
     rights  hereunder  shall operate as a waiver of any such right or any other
     right.  A waiver on any one or more  occasions  shall not be construed as a
     bar to or waiver of any right or remedy on any future occasion.

          B. All rights of Secured Party hereunder shall inure to the benefit of
     its successors and assigns,  and all  obligations of Pledgor shall bind its
     successors or assigns.  The rights and remedies of Secured Party  hereunder
     are  cumulative,  and the  exercise  of any  one or  more  of the  remedies
     provided  herein  shall  not be  construed  as a waiver of any of the other
     remedies of Secured Party.

          C.  The  security  interest  hereby  granted  and  all the  terms  and
     provisions hereof shall be deemed a continuing  security interest and shall
     continue in full force and effect,  and all the terms and provisions hereof
     shall  remain  effective  as between the  parties,  until the  repayment by
     Borrower of all Obligations.

          D.  This  Pledge  and the  security  interest  herein  granted  are in
     addition to, and not in substitution, novation or discharge of, any and all
     prior or  contemporaneous  security  agreements  and security  interests in
     favor of Secured Party or assigned to Secured Party by Pledgor. All rights,
     powers and remedies of Secured  Party in all such security  agreements  are
     cumulative,  but in the event of actual  conflict in terms and  conditions,
     the terms and conditions of the latest security  agreement shall govern and
     control.

          E. Any  provision of this Pledge found to be invalid under the laws of
     the  State of  Texas,  or any  other  state  having  jurisdiction  or other
     applicable  law,  shall be  invalid  only  with  respect  to the  offending
     provision.  All words used  herein  shall be  construed  of such  gender or
     number as the circumstances require. The laws of the State of Texas and, as
     applicable,  the laws of the United  States of America,  shall  govern this
     Pledge, its construction, interpretation and enforcement.

          F. This Pledge may be executed in any number of  counterparts,  all of
     which together shall constitute one and the same instrument.


                                       -2-

<PAGE>


          G. The  Collateral  shall at all times  remain  under the  control  of
     Secured Party until the Obligations  have been paid in full.  Except to the
     extent agreed to in writing by Secured Party and Banc One Capital Partners,
     L.P., Debtor shall not have access to the Collateral.

     EXECUTED to be effective as of May 20, 1997.

                                    PLEDGOR:

                                    NDE ENVIRONMENTAL CORPORATION


                                    By:      /S/ JAY ALLEN CHAFFEE
                                        _______________________________
                                         Jay Allen Chaffee
                                         Chairman of the Board


                                    SECURED PARTY:

                                    ACCEPTED AND AGREED TO BY THE
                                    OWNER AND HOLDER OF THE NOTE:

                                    BANK ONE, TEXAS, N.A.


                                    By:   /S/ CHARLES KINGSWELL-SMITH
                                        _______________________________
                                         Charles Kingswell-Smith
                                         Vice President


                                       -3-


                                                                    Exhibit 99.5
                          ASSIGNMENT OF PROMISSORY NOTE

     In  consideration of financial  accommodations  made or to be made to or at
the  request  of  NDE   ENVIRONMENTAL   CORPORATION,   a  Delaware   corporation
("Assignor")  by  BANK  ONE,  TEXAS,   N.A.,  a  national  banking   association
("Lender"), Assignor represents,  warrants, covenants and agrees with the Lender
as follows:

     1.  Assignment.  Assignor  hereby  assigns  to the Lender all of its right,
title and  interest in and to that  certain  Promissory  Note dated of even date
herewith  (together  with all  extensions,  renewals and  modifications  thereof
and/or  substitutions  therefor,  the  "Watson  Note")  made by  Watson  General
Corporation,  a California corporation,  ("Watson"), and payable to the order of
Assignor,  in the original  principal amount of Five Hundred Thousand and No/100
Dollars  ($500,000.00),  and all  monies  due or to  become  due  thereunder  or
connection  therewith.  Simultaneously  with the  execution and delivery of this
Assignment, Assignor shall deliver to Lender the original Assigned Note executed
by Watson. Unless otherwise notified in writing by Lender, Watson shall make all
payments of interest due hereunder to Assignor and all payments of principal due
hereunder to Lender.

     2. Collateral Security.  This Assignment is made as collateral security for
the prompt payment when due (whether by  acceleration  or otherwise) of (i) that
certain Revolving Note and that certain Term Note, both dated as of the 25th day
of October,  1996, as described in that certain Loan  Agreement  dated as of the
25th day of  October,  1996,  by and  among  NDE  ENVIRONMENTAL  CORPORATION,  a
Delaware corporation, TANKNOLOGY/NDE CORPORATION, a Delaware corporation, USTMAN
INDUSTRIES, INC., a Delaware corporation,  PROECO, INC., a Delaware corporation,
and TANKNOLOGY CANADA (1988) INC., a Canadian federal corporation (collectively,
"Borrower"), and BANK ONE, TEXAS, N.A., as amended (the "Loan Agreement");  (ii)
all extensions,  renewals,  modifications,  and/or  substitutions of or for such
promissory note (such promissory notes together with such extensions,  renewals,
modifications, and/or substitutions being herein collectively referred to as the
"Notes");  and (iii) all other  liabilities  and  obligations of Assignor to the
Lender,  whether  now  existing  or  hereafter  created  or  arising,  direct or
indirect,  matured or  unmatured,  and whether  absolute or  contingent,  joint,
several,  or joint and  several,  and no matter how the same may be evidenced or
shall arise (all of the foregoing  obligations  being  hereinafter  collectively
referred  to  as  the  "Obligations").  The  Notes  evidence  the  $5,000,000.00
Revolving  Line of Credit  and  $6,000,000.00  Term Loan  described  in the Loan
Agreement made or to be made by the Lender to Borrower pursuant to the terms and
conditions of the Loan Agreement.

     3. Assignor's  Warranties.  Assignor  warrants and represents to the Lender
that it is the sole  owner of the  Assigned  Note,  free and clear of all liens,
claims and encumbrances, that it has the right to make the assignment thereof as


<PAGE>



herein  set  forth,  that  the  Assigned  Note is valid, binding and enforceable
against  the  obligor  thereunder  in  accordance  with each and every  term and
condition  thereof,  that,  except as disclosed in the Watson Note, there are no
setoffs or defenses thereto,  that no modification to the Assigned Note has been
made,  that no  extensions  or renewals  have been granted or made  changing the
terms thereof,  and that as of the date of execution hereof,  the current unpaid
balance  of the  Assigned  Note is Five  Hundred  Thousand  and  No/100  Dollars
($500,000.00).

     4.  Negative  Covenants.  Assignor  shall not,  without  the prior  written
consent of the Lender, do or cause to be done any of the following:

          (a)  execute  or  consent  to any  amendment  or  modification  of the
     Assigned Note;

          (b) compromise or settle amounts due and owing to Assignor pursuant to
     the Assigned Note; or

          (c) exercise  any other  rights with  respect to the Assigned  Note in
     violation of any terms,  covenants or conditions  of the Loan  Agreement or
     any Loan Document (as such term is defined in the Loan Agreement).

     5. Indemnification. Assignor agrees to indemnify the Lender and to hold the
Lender  harmless from and against any loss or liability,  including the Lender's
reasonable  attorneys'  fees, in the event of its breach of any of the covenants
or  agreements  herein  set forth or in the event any of the  warranties  and/or
representations  set forth in this Assignment  shall prove to be false or untrue
in any respect.

     6.  Default by the  Assignor.  An Event of Default  shall be deemed to have
occurred  hereunder  as and when an  Event  of  Default  occurs  under  the Loan
Agreement or any Loan Document.

     7. The Lender's Rights in the Collateral.  So long as any Obligation  shall
remain  unpaid,  upon the  occurrence of any Event of Default,  the Lender shall
have the rights and remedies provided to it pursuant to the terms and conditions
of the Loan Agreement,  and without limiting the foregoing,  shall also have all
of the rights of an unconditional owner of the Assigned Note,  including but not
limited to, the following with respect thereto:

          (a)  The  right  to  declare  the  entire  principal  balance  thereof
     immediately  due and  payable in the event of a default in any of the terms
     thereof;

          (b) The right to collect the  principal  thereof,  and upon receipt of
     the unpaid balance of the principal sum with interest, to mark the Assigned
     Note as having been "paid in full", and to apply such sums  received by the

                                       -2-

<PAGE>



     Lender on account of  the interest and/or  principal  and/or other sums due
     or  hereafter  to  become  due  on  the  Notes  and/or  any  other  of  the
     Obligations;

          (c) The right to collect the interest thereon which may become due and
     payable,  and to apply such  interest  received by the Lender on account of
     the interest and/or  principal and/or other sums due or hereafter to become
     due on the Notes and/or any other of the Obligations; and

          (d) The right and authorization to collect or to compromise or to sell
     at public or private sale, at the option of the Lender at any time or times
     thereafter,  without  demand,  advertisement  or notice  (other than as set
     forth herein below or as specifically  required by law), the Assigned Note,
     or any part thereof, or any substitute(s)  therefor or addition(s) thereto,
     applying  the net  proceeds  thereof,  after  deduction  of all  costs  and
     expenses of such  collection,  compromise or sale (including  trustee's and
     attorneys'  fees),  to the  payment  of the Notes  and/or  any other of the
     Obligations,  including  interest  thereon,  and in case such net  proceeds
     shall be  insufficient  to pay the balance  due under the Notes  and/or any
     other  of  the  Obligations   (including  any  balance  due  by  virtue  of
     acceleration  of any of the foregoing),  Assignor shall  immediately pay to
     the Lender the amount of such deficiency, with interest thereon at the rate
     then  applicable  to the  Obligations  from  the  date  of the  receipt  in
     immediately  available  funds  by  the  Lender  of  the  proceeds  of  such
     collection,  compromise  or sale,  until paid.  Ten (10) days notice of the
     time and place of such sale shall be sent by certified or  registered  mail
     to Assignor and Assignor hereby waives all other notice  thereof.  Upon any
     such  foreclosure,  the Lender may purchase all or any part of the Assigned
     Note at the best  price  obtainable  without  being  liable to  account  to
     Assignor or any other person by reason  thereof.  Nothing in this Paragraph
     shall limit any of the  Lender's  other  rights or remedies  under the Loan
     Documents or applicable law; and

          (e)  The  right  to  institute,   prosecute  to  judgment,  settle  or
     discontinue any proceeding at law or in equity to enforce the collection of
     the Assigned Note and/or the debt  evidenced  thereby,  provided,  however,
     that after deduction of the amount of any legal and other expenses incurred
     in  connection  with any such  collection  efforts,  together with interest
     thereon at the rate then  applicable  to the  Obligations,  the proceeds of
     such  collection  efforts  shall be applied in  reduction  of the  interest
     and/or principal sum and/or other sums due on the Notes and/or any other of
     the  Obligations,  as of the date of receipt of such proceeds by the Lender
     in immediately  available  funds, and Assignor agrees to pay any deficiency
     owing on the Notes and on any other of the Obligations, with interest.



                                       -3-

<PAGE>



     8. Return of Collateral.  If all of the terms hereof are fully performed by
Assignor,  and upon the receipt by the Lender (in collected  fund) of the entire
principal  sum of the  Notes  and all other of the  Obligations,  together  with
interest  and all other  sums  owing  thereon,  the Lender  shall  re-assign  to
Assignor (without recourse or warranty) the Assigned Note.

     9. Notices.  All notices which are required or permitted hereunder shall be
in  writing  and shall be either  hand  delivered,  or  mailed by  certified  or
registered U.S. Mail,  return receipt  requested,  first class postage  prepaid,
addressed to the parties as follows:

         If to Lender:                 BANK ONE, TEXAS, N.A.
                                       910 Travis
                                       Houston, Texas 77002
                                       Attention: Charles Kingswell-Smith
                                       Facsimile:  (713) 751-7894

         with a copy to:               HUTCHESON & GRUNDY, L.L.P.
                                       1200 Smith, Suite 3300
                                       Houston, Texas 77002
                                       Attention: Michael L. Grove
                                       Facsimile:  (713) 951-2925

         If to the Borrower:           NDE ENVIRONMENTAL CORPORATION
                                       8900 Shoal Creek Bldg. 200
                                       Austin, Texas  78757
                                       Attention: President
                                       Facsimile:  (512) 459-1459

         with a copy to:               NDE ENVIRONMENTAL CORPORATION
                                       712 Main Street, Suite 1700
                                       Houston, Texas  77002
                                       Attention: Jay Allen Chaffee
                                       Facsimile:  (713) 223-5379

     or to such other address as either party shall  designate by written notice
to the other in the manner provided herein.

     10.  Benefit and Governing  Law. This  Assignment  shall be governed in all
respects  by the laws of the State of Texas and shall be binding  upon and inure
to the  benefit of the parties  hereto and their  respective  heirs,  executors,
administrators, personal representatives, successors and assigns.




                                       -4-

<PAGE>



     IN WITNESS WHEREOF,  the parties hereto have executed this instrument to be
effective as of the 20th day of May, 1997.


                                    ASSIGNOR:

                                   NDE ENVIRONMENTAL CORPORATION


                                   By:       /S/ JAY ALLEN CHAFFEE
                                        ________________________________
                                        Jay Allen Chaffee
                                        Chairman of the Board


                                       -5-


                                                                    Exhibit 99.6
                              BANK ONE, TEXAS, N.A.
                        CONSENT, RELEASE AND UNDERTAKING

     NDE Environmental  Corporation,  a Delaware corporation ("NDE"), granted to
Bank One, Texas,  N.A. ("Bank One") liens and security  interests on the capital
stock  ("USTMAN  Stock") of USTMAN  Industries,  Inc.,  a  Delaware  corporation
("USTMAN"),  and  USTMAN  granted  to Bank One liens and  security  interest  in
certain assets and  properties of USTMAN  ("USTMAN  Assets") in connection  with
certain  borrowings by NDE from Bank One pursuant to that certain Loan Agreement
dated as of October  25,  1996 ("Loan  Agreement")  by and among Bank One,  NDE,
Tanknology/NDE   Corporation  ("TNC"),   USTMAN,  Proeco,  Inc.  ("Proeco")  and
Tanknology of Canada (1988), Inc.  ("Tanknology  Canada") (such borrowings under
the Loan Agreement are referred to herein as the "Indebtedness");

                              W I T N E S S E T H:

     WHEREAS,  NDE has agreed to sell to Watson General  Corporation  ("Watson")
all of the USTMAN Stock; and

     WHEREAS,  Bank One has  agreed to (a)  consent to such  sale,  (b)  release
USTMAN from its  Obligations  (as defined in the Loan Agreement) with respect to
the Indebtedness and (c) release its liens and security  interests in the USTMAN
Stock and USTMAN Assets in accordance with the terms and provisions hereof;

     NOW  THEREFORE,  for good  and  valuable  consideration,  the  receipt  and
sufficiency of which is hereby acknowledged:

     1. Bank One  hereby  consents  to the sale by NDE to  Watson of the  USTMAN
Stock  ("Sale  Transaction")  and  does  hereby  (a)  release  USTMAN  from  its
Obligations  with  respect to the  Indebtedness  and (b)  release  its liens and
security interests in the USTMAN Stock and the USTMAN Assets.

     2. Bank One hereby agrees to release Certificate No. 3 evidencing the 1,000
shares of USTMAN Stock.

     3. The consents and releases  referred to in paragraphs 1 and 2 above shall
be effective only upon closing of the Sale  Transaction and the  satisfaction of
all of the  conditions  enumerated in Article III of Amendment No. 2 to the Loan
Agreement of even date herewith (the "Second Amendment").

     4. Bank One shall from time to time, upon request by Watson, USTMAN or NDE,
execute  and  deliver  such  financing  statement  releases  or other  documents
necessary  to release any lien or security  interest of the  undersigned  in the
USTMAN Stock or the USTMAN Assets.

     5. NDE hereby  agrees to (a) deposit  $3,000,000  of the cash proceeds from
the Sale  Transaction  in a  certificate  of deposit at Bank One pledged to Bank
One,  (b)  pledge  to  Bank  One the  $500,000  note  to be  received  by NDE in
connection  with the Sale Transaction  and (c) apply the remaining cash proceeds


                                       -1-

<PAGE>


of the Sale  Transaction,  less  expenses,  to the  outstanding  balance  of the
Revolving  Note (as  defined in the Loan  Agreement),  with any excess  over the
outstanding balance of the line of credit to be paid to NDE.

     6. NDE hereby  agrees to execute the Second  Amendment in the form attached
hereto as Exhibit A.

     7. This consent, release and undertaking shall be governed by and construed
in accordance  with the laws of the State of Texas and applicable  United States
federal law.

     8. This Consent,  Release and Undertaking shall be binding upon each of the
undersigned  and its successors  and assigns,  and shall inure to the benefit of
NDE, USTMAN,  Watson and Bank One and their  respective  successors and assigns.
Notwithstanding anything contained herein to the contrary, this Consent, Release
and  Undertaking  shall in all  respects be subject to and governed by the terms
and conditions of the Second Amendment attached hereto as Exhibit A.

     DATED AND EFFECTIVE as of the 20th day of May, 1997.

                                    BANK ONE, TEXAS, N.A.


                                    By:      /S/ CHARLES KINGSWELL-SMITH
                                        ______________________________________
                                          Authorized Signing Officer



                                    NDE ENVIRONMENTAL CORPORATION


                                    By:      /S/ JAY CHAFFEE
                                        ______________________________________
                                          Jay Chaffee, Chairman of the Board



                                       -2-



                                                                    Exhibit 99.7
                         BANC ONE CAPITAL PARTNERS, L.P.
                        CONSENT, RELEASE AND UNDERTAKING

     NDE Environmental  Corporation,  a Delaware corporation ("NDE"), granted to
Banc  One  Capital  Partners,  L.P.  ("Capital  Partners")  liens  and  security
interests on the capital stock ("USTMAN  Stock") of USTMAN  Industries,  Inc., a
Delaware  corporation  ("USTMAN"),  and USTMAN granted to Capital Partners liens
and  security  interests in certain  assets and  properties  of USTMAN  ("USTMAN
Assets") in  connection  with certain  borrowings  by NDE from Capital  Partners
pursuant to that certain Note and Warrant Purchase Agreement dated as of October
25, 1996 ("Note Purchase Agreement") among NDE, TNC, USTMAN, Proeco,  Tanknology
Canada and Capital Partners (such  borrowings under the Note Purchase  Agreement
are referred to herein as the "Indebtedness");

                              W I T N E S S E T H:

     WHEREAS, NDE has agreed to sell to Watson General Corporation, a California
corporation ("Watson"), all of the USTMAN Stock; and

     WHEREAS,  Capital  Partners  has agreed to (a)  consent  to such sale,  (b)
release USTMAN from its  obligations  with respect to the  Indebtedness  and (c)
release its liens and security  interests in the USTMAN Stock and USTMAN  Assets
in accordance with the terms and provisions hereof;

     NOW  THEREFORE,  for good  and  valuable  consideration,  the  receipt  and
sufficiency of which is hereby acknowledged:

     1.  Capital  Partners  hereby  consents to the sale by NDE to Watson of the
USTMAN Stock ("Sale  Transaction")  and does hereby (a) release  USTMAN from its
obligations with respect to the  Indebtedness,  including its obligations  under
the Note  Purchase  Agreement  and that  certain  Security  Agreement - Personal
Property dated as of October 25, 1996 among NDE, TNC, USTMAN, Proeco, Tanknology
Canada and Capital Partners ("Security Agreement") and (b) release its liens and
security  interests  in (i) the USTMAN  Stock  pledged  pursuant to that certain
Security  Agreement--Pledge  of  Subsidiary  Stock  dated as of October 25, 1996
between NDE and Capital Partners and (ii) the USTMAN Assets.

     2. Capital  Partners agrees to the release by Bank One, Texas,  N.A. ("Bank
One") of Certificate No. 3 evidencing 1,000 shares of USTMAN Stock.

     3. The consents and releases  referred to in paragraphs 1 and 2 above shall
be effective only upon closing of the Sale Transaction.

     4. Capital Partners shall from time to time upon request by Watson,  USTMAN
or NDE execute and deliver such financing  statement releases or other documents
necessary  to release any lien or security  interest of Capital  Partners in the
USTMAN Stock or the USTMAN Assets.



                                       -1-

<PAGE>



     5. NDE hereby  agrees to (a) deposit  $3,000,000  of the cash proceeds from
the Sale Transaction in a certificate of deposit at Bank One pledged to Bank One
and Capital  Partners,  which  collateral  account is hereby  acknowledged to be
subject to the Security  Agreement,  (b) pledge to Bank One and Capital Partners
the $500,000 note to be received by NDE in connection with the Sale Transaction,
which  $500,000  note is  hereby  acknowledged  to be  covered  by the  Security
Agreement  and (c) apply the remaining  cash  proceeds of the Sale  Transaction,
less expenses, to the outstanding balance of the line of credit of NDE from Bank
One,  with any excess over the  outstanding  balance of the line of credit to be
paid to NDE.

     6. The  $3,000,000  certificate  of  deposit  ("CD") has been  pledged  and
delivered  by NDE to Bank One pursuant to the Pledge of  Certificate  of Deposit
dated as of May 20, 1997 ("Pledge  Agreement") and the $500,000  promissory note
("Watson  Note") made by Watson has been  assigned  to Bank One  pursuant to the
Assignment  of  Promissory  Note dated May 20,  1997  ("Assignment  Agreement").
Pursuant to the Intercreditor Agreement, Bank One has agreed to hold such CD and
Watson Note as agent for Capital Partners and upon its release of its pledge and
assignment under such Pledge Agreement and Assignment  Agreement to deliver such
CD and Watson Note to Capital Partners in pledge under this Consent, Release and
Undertaking.  NDE  hereby  consents  to such  delivery  by Bank  One to  Capital
Partners.  In addition,  with  respect to the CD and Watson  Note,  NDE (i) upon
request of Capital  Partners,  shall  deliver  to  Capital  Partners,  financing
statements  (form UCC-1) in proper form for filing under the Uniform  Commercial
Code in each  jurisdiction as may be necessary or, in the reasonable  opinion of
Capital Partners,  desirable to perfect the security interest created,  granted,
or extended herein. NDE hereby authorizes Capital Partners to file, and appoints
Capital Partners its  attorney-in-fact  for the purpose of executing and filing,
such  financing   statements  or  any  additional  financing  statement  or  any
continuation  statement  without the signature of NDE to the extent permitted by
Applicable Law (as defined in the Security Agreement).


     7. NDE hereby  represents  and warrants that it will not as a result of the
consummation of the Sale Transaction be in  non-compliance  with any covenant of
the Note Purchase Agreement except for Sections 9(c) (insofar, and only insofar,
as Section 9(c) would apply to the set- off provisions of the Watson Note), 9(g)
and 9(j) thereof,  with respect to which Sections such  non-compliance is hereby
waived.

     8. This consent, release and undertaking shall be governed by and construed
in accordance  with the laws of the State of Ohio and  applicable  United States
federal law.

     9. This consent,  release and undertaking shall be binding upon each of the
undersigned  and its successors  and assigns,  and shall inure to the benefit of
NDE, USTMAN,  Watson and Capital  Partners and their  respective  successors and
assigns.

                                       -2-

<PAGE>


     DATED AND EFFECTIVE as of the 20th day of May, 1997.

                                    BANC ONE, CAPITAL PARTNERS, L.P.,
                                    By: BOCP Corporation, General Partner



                                       By:        /S/ WILLIAM P. LEAHY
                                             ___________________________________
                                             Authorized Signing Officer



                                    NDE ENVIRONMENTAL CORPORATION


                                       By:        /S/ JAY CHAFFEE
                                             ___________________________________
                                             Jay Chaffee, Chairman of the Board



                         -3-



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