EXHIBIT 2.7





                            STOCK PURCHASE AGREEMENT

                                  BY AND AMONG
                    WESTERN INDUSTRIAL RESOURCES CORPORATION,
                             AN ARIZONA CORPORATION,
                        ORGANIC WASTE TECHNOLOGIES, INC.,
                             A DELAWARE CORPORATION,
                           BRUCE NAVE AND MARCIA NAVE,
                 AND, WITH RESPECT TO SECTIONS 6.4, 6.8 and 8.5,
                         EMCON, A CALIFORNIA CORPORATION








                                       52


                      TABLE OF CONTENTS
                                                                           Page

1.    Definitions ......................................................     55
      1.1         Affiliate ............................................     55
      1.2         Cash Consideration ...................................     55
      1.4         Closing Date .........................................     55
      1.5         Commission ...........................................     55
      1.6         "GAAP" ...............................................     55
      1.7         Governmental Entity ..................................     55
      1.8         Holder Knowledge .....................................     55
      1.9         Material Adverse Effect ..............................     55
      1.10        "Purchase" ...........................................     55
      1.11        Securities Act .......................................     55

2.    Purchase and Sale ................................................     56
      2.1         Purchase and Sale ....................................     56
      2.2         Aggregate Consideration ..............................     56
      2.3         Closing; Delivery ....................................     56

3.    Representations and Warranties of WI and the Sellers .............     56
      3.1         Organization, Standing and Power .....................     56
      3.2         Authority ............................................     57
      3.3         Title to Property ....................................     57
      3.4         Capital Structure ....................................     57
      3.5         Financial Statements .................................     58
      3.6         Absence of Certain Changes ...........................     58
      3.7         Absence of Undisclosed Liabilities ...................     58
      3.8         Governmental Authorization ...........................     58
      3.9         Litigation ...........................................     58
      3.10        Restrictions on Business Activities ..................     58
      3.11        Intellectual Property ................................     59
      3.12        Interested Party Transactions ........................     59
      3.13        Minute Books .........................................     59
      3.14        Complete Copies of Materials .........................     59
      3.15        Material Contracts ...................................     59
      3.16        Accounts Receivable ..................................     59
      3.17        Customers and Suppliers ..............................     60
      3.18        Employees and Consultants ............................     60
      3.19        Environmental Matters ................................     60
      3.20        Taxes ................................................     60
      3.21        Employee Benefit Plans ...............................     62
      3.22        Employee Matters .....................................     63
      3.23        Insurance ............................................     63
      3.24        Compliance With Laws .................................     63
      3.25        Ownership of Shares and Options ......................     63
      3.26        Information Supplied .................................     64
      3.27        Brokers or Finders ...................................     64
      3.28        Representations Complete .............................     64

4.    Representations and Warrantees of EMCON ..........................     64
      4.1         Organization, Standing and Power .....................     64
      4.2         Authority ............................................     64

5.    Preclosing Covenants of WI .......................................     64
      5.1         Conduct of Business of WI ............................     64
      5.2         Access to Information ................................     66
      5.3         Exclusivity ..........................................     66



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                      TABLE OF CONTENTS
                                                                            Page

6.    Mutual Covenants .................................................     66

      6.1         No Public Announcement ...............................     66
      6.2         Consents; Cooperation ................................     67
      6.3         Legal Requirements ...................................     67
      6.4         Confidentiality ......................................     67
      6.5         Public Disclosure ....................................     67
      6.6         Further Assurances ...................................     67
      6.7         Expenses .............................................     67

7.    Conditions to Each Party's Obligations ...........................     67
      7.1         No Injunctions or Restraints; Illegality .............     67
      7.2         Governmental Approval ................................     68

8.    Conditions to the Sellers' Obligations ...........................     68
      8.1         Accuracy of Representations and Warranties ...........     68
      8.2         Covenants and Conditions .............................     68
      8.3         Employment and Non-Competition Agreements ............     68
      8.4         Documents ............................................     68
      8.5         Release of Personal Guaranty .........................     68

9.    Conditions to Emcon's Obligations ................................     68
      9.1         Accuracy of Representations and Warranties ...........     68
      9.2         Covenants and Conditions .............................     68
      9.3         Certificate of Secretary .............................     68
      9.4         No Material Adverse Change ...........................     68
      9.5         Repayment and Cancellation of Promissory Note ........     68
      9.6         Third Party Consents .................................     68
      9.7         Employment and Non-Competition Agreements ............     69
      9.8         Delivery of Stock Certificates .......................     69
      9.9         Opinion of Counsel ...................................     69
      9.10        Termination of Employment Contracts ..................     69
      9.11        Documents ............................................     69

10.   Termination ......................................................     69
      10.1        Termination ..........................................     69
      10.2        Effect of Termination ................................     69
      10.3        Extension; Waiver ....................................     69
      10.4        Obligations Following Termination ....................     70

11.   Miscellaneous ....................................................     70
      11.1        Governing Law ........................................     70
      11.2        Notices ..............................................     70
      11.3        Binding Upon Successors and Assigns ..................     72
      11.4        Severability..........................................     72
      11.5        Remedies Cumulative ..................................     72
      11.6        Entire Agreement .....................................     72
      11.7        Counterparts .........................................     72
      11.8        Amendment and Waivers ................................     72
      11.9        Survival of Agreements ...............................     72
      11.10       Construction of Agreement ............................     72
      11.11       Absence of Third Party Beneficiary Rights ............     72



                             54


                            STOCK PURCHASE AGREEMENT


         THIS STOCK PURCHASE  AGREEMENT (the "Agreement") is effective as of the
4th  day  of  December,   1998,  by  and  among  Western  Industrial   Resources
Corporation, an Arizona corporation ("WI"), Organic Waste Technologies,  Inc., a
Delaware  corporation  ("OWT"),  Bruce Nave and Marcia Nave  (collectively,  the
"Sellers"  and each a "Seller")  and, with respect to Sections 6.4, 6.8 and 8.5,
EMCON, a California Corporation ("EMCON").

                                    RECITALS


          A. The Sellers are the owners of all of the outstanding  capital stock
of WI (the "WI Shares") prior to the Closing Date (as defined below).


          B. OWT wishes to acquire  the WI Shares in exchange  for certain  cash
payments  pursuant to the terms of this Agreement and each of the Sellers wishes
to sell all WI  Shares  which  he,  she or it holds as of the  Closing  Date (as
defined below) to OWT pursuant to the terms of this Agreement (the "Purchase").


          C. The parties  hereto  desire to set forth  certain  representations,
warranties  and  covenants  made by each of the  other as an  inducement  to the
consummation of the Purchase.

                                    AGREEMENT

         NOW,  THEREFORE,  in reliance on the foregoing  recitals and in and for
the  consideration  and mutual covenants set forth herein,  the parties agree as
follows:

         1.       Definitions.

                  1.1 "Affiliate"  shall have the meaning set forth in the rules
and regulations promulgated by the Commission pursuant to the Securities Act.

                  1.2 "Cash  Consideration"  shall mean the amount to be paid to
the Sellers under Sections 2.2(a) and (b), subject to Section 2.2(c).

                  1.3 "Closing"  shall have the meaning set forth in Section 2.3
hereof.

                  1.4 "Closing Date" shall have the meaning set forth in Section
2.3 hereof.

                  1.5 "Commission"  shall mean the United States  Securities and
Exchange Commission.

                  1.6  "GAAP"   shall   mean   generally   accepted   accounting
principals.

                  1.7  "Governmental   Entity"  means  any  (i)  nation,  state,
commonwealth,  province,  territory,  county,  municipality,  district  or other
jurisdiction of any nature; (ii) federal,  state, local,  municipal,  foreign or
other government;  or (iii) governmental or quasi-governmental  authority of any
nature (including any governmental  division,  department,  agency,  commission,
official, organization, and any court or other tribunal).

                  1.8 "Knowledge"  means any reference to a party's  "knowledge"
means such  party's  actual  knowledge  after  reasonable  inquiry of  officers,
directors  and  other  employees  of  such  party  reasonably  believed  to have
knowledge of such matters.

                  1.9 "Material Adverse Effect" means any reference with respect
to any entity or group of entities to a material adverse effect on the business,
assets  (including  intangible  assets),   financial  condition  or  results  of
operations  of such entity,  taken as a whole.  When the word  "material" is not
capitalized it shall mean material with respect to the matter referenced.

                  1.10  "Purchase"  shall mean the  purchase  and sale of the WI
shares as described in Section 2.1 hereof.

                  1.11  "Securities  Act" shall mean the Securities Act of 1933,
as  amended,  or any  similar  federal  statute  and the rules  and  regulations
thereunder, all as the same shall be in effect at the time.




                                       55

         2.       Purchase and Sale.

                  2.1 Purchase and Sale. At the Closing,  the Sellers shall sell
to  OWT,  and OWT  shall  purchase  from  the  Sellers,  all of the  issued  and
outstanding WI Shares for the Cash Consideration described below.

                  2.2 Cash Consideration.

                      (a) The initial  purchase price for the WI Shares shall be
One Hundred Eighty Nine Thousand Dollars ($189,000),  of which One Hundred Fifty
Nine  Thousand  Dollars  ($159,000)  shall be paid to the Sellers at the Closing
(the "Initial  Payment") and Thirty Thousand Dollars ($30,000) shall be withheld
pursuant to Section 2.2(c) hereof for payment of the Outstanding Tax Liabilities
(as defined  below).  The Initial  Payment  will be allocated to each Seller pro
rata based on the number of WI Shares being sold to OWT by such Seller.

                      (b) In addition to the Initial  Payment,  the Sellers will
be eligible to earn additional consideration,  regardless of the either Sellers'
employment status with the Company, based on the performance of WI subsequent to
the  Closing,  as  described  on Exhibit A attached  hereto  (each an  "Earn-out
Payment").  Each Earn-out Payment paid to Sellers,  if any, will be allocated to
each  Seller  pro rata  based on the  number  of WI  Shares  sold to OWT by such
Seller.

                      (c) OWT shall withhold Thirty Thousand  Dollars  ($30,000)
from the Initial  Consideration  for payment to applicable  tax  authorities  of
interest  and  penalties  paid or  payable  after  September  21,  1998  and any
undisclosed taxes as of the Closing (the "Outstanding Tax Liabilities").  In the
event the  Outstanding  Tax  Liabilities  are less than  $30,000 as of March 31,
1999, the amount of the shortfall shall be paid as soon as practicable by OWT to
the  Sellers  pro rata  based on the  number  of WI  Shares  sold to OWT by such
Seller. In the event the Outstanding Tax Liabilities are greater than $30,000 as
of March 31, 1999,  the amount of the excess (the "Excess  Liability")  shall be
paid as soon as practicable to OWT by Sellers pro rata based on the number of WI
Shares sold to OWT by such Seller; provided,  however, that any Excess Liability
owed that is not  assessed at March 31,  1999 or that is unpaid by the  Sellers,
shall be deducted from the first Earn-out Payment and, to the extent  necessary,
from each subsequent  Earn-out  Payment to the extent such  subsequent  Earn-out
Payments are sufficient to offset the Excess Liability.

                  2.3  Closing;  Delivery.  The  closing  of the  Purchase  (the
"Closing")  shall take place at the offices of Gray Cary Ware & Freidenrich LLP,
400 Hamilton  Avenue,  Palo Alto,  California at 10:00 a.m., on December 4, 1998
(the  "Closing  Date"),  or at such other time and place as OWT and the  Sellers
shall  mutually  agree.  At  the  Closing,  each  Seller  shall  deliver  to OWT
certificate(s)  representing  the WI Shares  that the  Seller is  selling,  duly
endorsed or with assignments separate from certificate,  against delivery to the
Seller  by OWT of a check  in the  amount  of the  Initial  Payment  due to such
Seller.

          3.  Representations  and  Warranties of WI and the Sellers.  Except as
disclosed in a document of even date  herewith and  delivered by WI to OWT prior
to  the  execution  and  delivery  of  this   Agreement  and  referring  to  the
representations and warranties in this Agreement (the "WI Disclosure Schedule"),
each of the  Sellers and WI,  represents  and  warrants  to OWT as follows  (any
representation or warranty of WI herein being deemed to be a representation  and
warranty of each Seller):

                  3.1 Organization, Standing and Power. WI is a corporation duly
organized,  validly existing and in good standing under the laws of the State of
Arizona.  WI has the corporate  power to own its  properties and to carry on its
business as now being  conducted and is duly  qualified to do business and is in
good standing in each  jurisdiction  in which the failure to be so qualified and
in good standing would have a Material Adverse Effect on WI. WI has delivered to
OWT a true and correct  copy of the Articles of  Incorporation  and Bylaws of WI
each as amended to date. WI is not in violation of any of the  provisions of its
Articles of Incorporation or Bylaws.  WI does not directly or indirectly own any
equity or similar  interest in, or any interest  convertible or  exchangeable or
exercisable   for,  any  equity  or  similar   interest  in,  any   corporation,
partnership, joint venture or other business association or entity.

                  3.2 Authority.

                      (a) WI has,  and will  have as of the  Closing  Date,  all
requisite  corporate  power and  authority to enter into this  Agreement  and to
consummate the transactions  contemplated  hereby. The execution and delivery of
this  Agreement  has,  and  as of  the  Closing  Date  the  consummation  of the
transactions  contemplated  hereby  will  have  been,  duly  authorized  by  all
necessary  corporate  action  on the part of WI.  This  Agreement  has been duly
executed and delivered by WI and constitutes the valid and binding obligation of
WI  enforceable  against  WI in  accordance  with  its  terms,  except  as  such
enforceability  may be limited by  bankruptcy,  insolvency,  moratorium or other
similar  laws  affecting  or relating to  creditors'  rights  generally,  and is
subject to general  principles  of equity.  The  execution  and delivery of this
Agreement by WI does not, and the consummation of the transactions  contemplated
hereby will not,  conflict with, or result in any violation of, or default under
(with or without  notice or lapse of time, or both),  or give rise to a right of
termination, cancellation or acceleration of any

                                       56



material  obligation or loss of any material  benefit under (i) any provision of
the Articles of  Incorporation  or Bylaws of WI, or (ii) any material  mortgage,
indenture, lease, contract or other agreement or instrument, permit, concession,
franchise,  license,  judgment,  order, decree, statute, law, ordinance, rule or
regulation  applicable  to WI or any of its  properties  or assets.  No consent,
approval,  order or  authorization  of, or  registration,  declaration or filing
with, any Governmental Entity is required by or with respect to WI in connection
with the execution  and delivery of this  Agreement or the  consummation  of the
transactions  contemplated  hereby,  except for such  consents,  authorizations,
filings,  approvals and registrations  which, if not obtained or made, would not
have a Material Adverse Effect on WI and would not prevent,  or materially alter
or delay any of the transactions contemplated by this Agreement.

                      (b) Each Seller has, and will have as of the Closing Date,
all requisite power and authority to enter into this Agreement and to consummate
the  transactions  contemplated  hereby.  The  execution  and  delivery  of this
Agreement has, and as of the Closing Date the  consummation of the  transactions
contemplated  hereby will have been, duly authorized by all necessary  action on
the part of each Seller, to the extent  necessary.  This Agreement has been duly
executed  and  delivered  by  Seller  and  constitutes  the  valid  and  binding
obligation of Seller  enforceable  against Seller in accordance  with its terms,
except  as  such  enforceability  may  be  limited  by  bankruptcy,  insolvency,
moratorium  or other  similar laws  affecting or relating to  creditors'  rights
generally,  and is subject to general principles of equity. Any other agreements
or documents  required  hereunder to be executed and delivered by each Seller at
Closing will constitute the legal,  valid and binding  agreements of each Seller
executing the same,  enforceable  against such Seller in  accordance  with their
respective terms, except as enforcement may be limited by applicable bankruptcy,
insolvency,  reorganization,  fraudulent  conveyance,  moratorium  or other laws
affecting  creditor's  rights  generally.  The  execution  and  delivery of this
Agreement  by  Seller  does  not,  and  the  consummation  of  the  transactions
contemplated  hereby will not,  conflict with, or result in any violation of, or
default under (with or without  notice or lapse of time, or both),  or give rise
to a  right  of  termination,  cancellation  or  acceleration  of  any  material
obligation  or  loss  of any  material  benefit  under  any  material  mortgage,
indenture, lease, contract or other agreement or instrument, permit, concession,
franchise,  license,  judgment,  order, decree, statute, law, ordinance, rule or
regulation  applicable  to Seller or any of Seller's  properties  or assets.  No
consent,  approval,  order or authorization of, or registration,  declaration or
filing with, any Governmental Entity is required by or with respect to Seller in
connection with the execution and delivery of this Agreement or the consummation
of  the   transactions   contemplated   hereby,   except   for  such   consents,
authorizations,  filings,  approvals and registrations which, if not obtained or
made,  would not have a Material Adverse Effect on Seller and would not prevent,
or  materially  alter  or delay  any of the  transactions  contemplated  by this
Agreement.

                  3.3 Title to Property. WI has good and marketable title to all
of its  properties,  interests  in  properties  and assets,  real and  personal,
reflected in the WI Balance  Sheet or acquired  after the WI Balance  Sheet Date
(except  properties,  interests  in  properties  and  assets  sold or  otherwise
disposed of since the WI Balance Sheet Date in the ordinary course of business),
and with respect to leased  properties  and assets,  valid  leasehold  interests
therein,  free  and  clear  of  all  mortgages,   liens,  pledges,   charges  or
encumbrances of any kind or character,  except (i) the lien of current taxes not
yet due and payable, (ii) such imperfections of title, liens and easements as do
not and  will  not  materially  detract  from or  interfere  with the use of the
properties subject thereto or affected thereby,  or otherwise  materially impair
business  operations  involving  such  properties  and (iii) liens securing debt
which is reflected  on the WI Balance  Sheet.  The property and  equipment of WI
that are used in the operations of its  businesses are in all material  respects
in good  operating  condition and repair,  subject to normal wear and tear.  All
material properties used in the operations of WI are reflected in the WI Balance
Sheet to the extent GAAP require the same to be  reflected.  All leases to which
WI is a  party  are in  full  force  and  effect  and  are  valid,  binding  and
enforceable  in  accordance  with  their  respective   terms,   except  as  such
enforceability  may be limited by (i)  bankruptcy  laws and other  similar  laws
affecting  creditors'  rights  generally and (ii) general  principles of equity,
regardless  of whether  asserted in a proceeding  in equity or at law.  True and
correct  copies of all such  leases  have been  provided to OWT. WI owns no real
property.

                  3.4 Capital Structure.

                      (a) The authorized capital stock of WI consists of 100,000
shares of  Common  Stock.  As of the  Closing  Date,  there  will be issued  and
outstanding  100,000 shares of Common Stock.  All  outstanding  shares of Common
Stock of WI are duly authorized,  validly issued,  fully paid and non-assessable
and are free of any liens or  encumbrances  other than any liens or encumbrances
created  by or  imposed  upon  the  holders  thereof,  and  are not  subject  to
preemptive rights or rights of first refusal created by statute, the Articles of
Incorporation  or  Bylaws  of WI or any  agreement  to which WI is a party or by
which it is bound.


                                       57

                      (b)  Except  for  the  rights  created  pursuant  to  this
Agreement,  there are no other options,  warrants, calls, rights, commitments or
agreements  of any  character  to  which  WI is a party  or by which it is bound
obligating  WI to  issue,  deliver,  sell,  repurchase  or redeem or cause to be
issued, delivered, sold, repurchased or redeemed, any shares of Capital Stock of
WI or  obligating  WI to grant,  extend,  accelerate  the vesting of, change the
price of, or  otherwise  amend or enter  into any such  option,  warrant,  call,
right,  commitment or agreement.  There are no other  contracts,  commitments or
agreements  relating  to  voting,  purchase  or sale of WI's  capital  stock (i)
between  or among  WI and any of its  shareholders  and (ii) to WI's  knowledge,
between  or among any of WI's  shareholders.  All shares of  outstanding  Common
Stock of WI were  issued in  compliance  with all  applicable  federal and state
securities laws.

                  3.5  Financial  Statements.   WI  has  delivered  to  OWT  its
unaudited financial  statements for the fiscal year ended December 31, 1997, and
for the nine-month period ended September 30, 1998 (collectively, the "Financial
Statements").  The Financial  Statements  have been prepared in accordance  with
GAAP (except that the Financial  Statements do not contain footnotes) applied on
a consistent  basis  throughout the periods  indicated and with each other.  The
Financial  Statements  fairly  present the  financial  condition  and  operating
results of WI as of the dates, and for the periods,  indicated therein,  subject
to normal end of period adjustments.  WI maintains and will continue to maintain
a standard system of accounting  established and administered in accordance with
GAAP.

                  3.6 Absence of Certain Changes.  Since September 30, 1998 (the
"WI Balance Sheet Date"),  WI has conducted its business in the ordinary  course
consistent with past practice, and there has not occurred: (i) any change, event
or  condition  (whether or not covered by  insurance)  that has  resulted in, or
might reasonably be expected to result in, a Material Adverse Effect on WI; (ii)
any acquisition,  sale or transfer of any material asset of WI other than in the
ordinary course of business and consistent with past practice;  (iii) any change
in accounting  methods or practices  (including  any change in  depreciation  or
amortization  policies  or rates) by WI or any  revaluation  by WI of any of its
assets;  (iv) any declaration,  setting aside, or payment of a dividend or other
distribution  with  respect  to the  shares  of WI or  any  direct  or  indirect
redemption,  purchase or other acquisition by WI of any of its shares of capital
stock; (v) any material  contract entered into by WI, other than in the ordinary
course  of  business  and as  provided  to OWT,  or any  material  amendment  or
termination of, or default under,  any material  contract to which WI is a party
or by which it is  bound;  (vi) any  amendment  or  change  to the  Articles  of
Incorporation  or Bylaws of WI;  (vii) any  increase in or  modification  of the
compensation  or  benefits  payable  or to  become  payable  by WI to any of its
directors or employees;  or (viii) any  negotiation or agreement by WI to do any
of the things  described in the preceding  clauses (i) through (vii) (other than
negotiations  with  OWT  and  its  representatives  regarding  the  transactions
contemplated by this Agreement). At the Effective Time, there will be no accrued
but unpaid dividends on shares of WI's capital stock.

                  3.7  Absence of  Undisclosed  Liabilities.  WI has no material
obligations  or  liabilities  of any  nature  (matured  or  unmatured,  fixed or
contingent)  other than (i) those set forth or  adequately  provided  for in the
Balance Sheet for the period ended September 30, 1998 (the "WI Balance  Sheet"),
(ii) those  incurred in the  ordinary  course of business and not required to be
set forth in the WI Balance  Sheet  under  GAAP,  (iii)  those  incurred  in the
ordinary  course of business since the WI Balance Sheet Date and consistent with
past practice;  and (iv) those incurred in connection with the execution of this
Agreement.

                  3.8 Governmental Authorization.  WI has obtained each federal,
state, county, local or foreign governmental consent, license, permit, grant, or
other  authorization of a Governmental Entity (i) pursuant to which WI currently
operates or holds any interest in any of its properties or (ii) that is required
for the operation of WI's business or the holding of any such interest,  and all
of such  authorizations are in full force and effect except where the failure to
obtain or have any such authorizations  could not reasonably be expected to have
a Material Adverse Effect on WI.

                  3.9 Litigation.  There is no private or  governmental  action,
suit, proceeding, claim, arbitration or investigation pending before any agency,
court or tribunal,  foreign or domestic,  or, to the knowledge of WI, threatened
against  WI or any of their  respective  properties  or any of their  respective
officers or directors (in their capacities as such) that, individually or in the
aggregate, could reasonably be expected to have a Material Adverse Effect on WI.
There is no judgment,  decree or order  against WI, or, to the  knowledge of WI,
any of their  respective  directors or officers (in their  capacities  as such),
that could prevent, enjoin, or materially alter or delay any of the transactions
contemplated by this Agreement,  or that could  reasonably be expected to have a
Material Adverse Effect on WI. All litigation to which WI is a party (or, to the
knowledge of WI, threatened to become a party) is disclosed in the WI Disclosure
Schedule.

                  3.10  Restrictions  on  Business   Activities.   There  is  no
agreement,  judgment,  injunction,  order or decree binding upon WI which has or
could  reasonably  be expected to have the effect of  prohibiting  or materially
impairing  any current or future  business  practice of WI, any  acquisition  of
property by WI or the conduct of business  by WI as  currently  conducted  or as
proposed to be conducted by WI.
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                  3.11 Intellectual Property.

                      (a) WI owns or is licensed or otherwise  possesses legally
enforceable rights to use, all patents, patent applications,  trademarks,  trade
names, service marks,  copyrights (whether registered or unregistered),  and any
applications therefor, maskworks, maskwork applications,  net lists, schematics,
technology,  know-how, trade secrets, inventory,  ideas, algorithms,  processes,
computer software programs and applications (in both source code and object code
form),  client  lists and tangible or  intangible  proprietary  information  and
material  ("Intellectual  Property")  that are used or currently  proposed to be
used in the business of WI as currently conducted or as proposed to be conducted
by WI, except to the extent that the failure to have such rights has not had and
would not reasonably be expected to have a Material  Adverse Effect on WI. WI is
the exclusive owner of all Intellectual Property. WI has not licensed any of the
Intellectual Property on an exclusive basis.

                      (b) All patents, registered trademarks,  service marks and
copyrights  held  by  WI  are  valid  and  subsisting.  WI  is  not  infringing,
misappropriating  or making  unlawful use of, and has not received any notice or
other communication (in writing or otherwise) of any actual,  alleged,  possible
or potential  infringement,  misappropriation or unlawful use of any proprietary
asset  owned or used by any third  party.  WI (i) has not been sued in any suit,
action or  proceeding  which  involves a claim of  infringement  of any patents,
trademarks,  service marks, copyrights or violation of any trade secret or other
proprietary right of any third party; and (ii) has not brought any action,  suit
or proceeding for infringement of Intellectual Property or breach of any license
or agreement involving Intellectual Property against any third party.

                      (c)  All  current  and  former  officers,   employees  and
consultants of WI have executed and delivered to WI an agreement  (containing no
exceptions  or  exclusions  from  the  scope  of  its  coverage)  regarding  the
protection  of  proprietary   information  and  the  assignment  to  WI  of  any
Intellectual  Property  arising from services  performed for WI by such persons,
the form of which has been supplied to OWT.

                  3.12 Interested Party Transactions.  WI is not indebted to any
director,  officer,  employee  or agent of WI (except  for amounts due as normal
salaries and bonuses and in  reimbursement  of ordinary  expenses),  and no such
person is indebted to WI.

                  3.13 Minute  Books.  The minute books of WI made  available to
OWT contain a complete  and accurate  summary of all  meetings of directors  and
shareholders or actions by written consent since the time of incorporation of WI
through the date of this Agreement,  and reflect all transactions referred to in
such minutes accurately in all material respects.

                  3.14 Complete  Copies of  Materials.  WI has delivered or made
available true and complete  copies of each document which has been requested by
OWT or its counsel in connection with their legal and accounting review of WI.

                  3.15 Material Contracts. All material contracts and agreements
to which WI is a party are listed in the WI  Disclosure  Schedule  hereto.  With
respect to each such agreement:  (i) the agreement is legal, valid,  binding and
enforceable  and in full  force  and  effect  with  respect  to WI,  and to WI's
knowledge is legal,  valid,  binding,  enforceable  and in full force and effect
with respect to each other party  thereto,  in either case subject to the effect
of  bankruptcy,  insolvency,  moratorium  or other  similar laws  affecting  the
enforcement of creditors'  rights  generally and except as the  availability  of
equitable  remedies  may be limited by general  principles  of equity;  (ii) the
agreement will continue to be legal, valid,  binding and enforceable and in full
force and effect immediately  following the Closing in accordance with the terms
thereof as in effect prior to the Closing,  subject to the effect of bankruptcy,
insolvency,  moratorium  or other  similar laws  affecting  the  enforcement  of
creditors' rights generally and except as the availability of equitable remedies
may be limited by general principles of equity; and (iii) neither the WI nor, to
WI's  knowledge,  any other  party,  is in breach or  default,  and no event has
occurred which with notice or lapse of time would constitute a breach of default
by WI or, to WI's  knowledge,  by any such other party,  or permit  termination,
modification  or  acceleration,  under the  agreement.  WI is not a party to any
material  oral  contract,  agreement or other  arrangement  other than as may be
disclosed in the WI Disclosure Schedule.

                  3.16 Accounts Receivable. Subject to any reserves set forth in
the  Financial  Statements,  the  accounts  receivable  shown  on the  Financial
Statements  represent and will represent  bona fide claims  against  debtors for
sales and other charges, are collectible in accordance with their terms at their
recorded  amounts  and are not  subject to  discount  except for normal cash and
immaterial  trade  discounts.  The amount  carried  for  doubtful  accounts  and
allowances  disclosed in the  Financial  Statements is sufficient to provide for
any losses which may be sustained on revaluation of the receivables.


                                       59


                  3.17  Customers  and  Suppliers.  As of the  date  hereof,  no
customer  which  individually  accounted for more than 5% of WI's gross revenues
during the 12 month period  preceding  the date hereof and no supplier of WI has
canceled or otherwise terminated,  or made any written threat to WI to cancel or
otherwise  terminate,  its  relationship  with WI or has at any time on or after
September 30, 1998  decreased  materially  its services or supplies to WI in the
case of any such supplier, or its usage of the services or products of WI in the
case of such customer,  and to WI's knowledge,  no such supplier or customer has
indicated either orally or in writing that it will cancel or otherwise terminate
its relationship  with WI or to decrease  materially its services or supplies to
WI or its usage of the  services  or  products of WI, as the case may be. WI has
not knowingly  breached any agreement with, or engaged in any fraudulent conduct
with respect to, any customer or supplier of WI.

                  3.18  Employees and  Consultants.  The WI Disclosure  Schedule
contains  a list of the names of all  employees  and  consultants  of WI,  their
respective  salaries or wages,  other  compensation  and dates of employment and
positions.

                  3.19 Environmental Matters.

                      (a) As used in this Agreement:

                         (i) "Environmental Laws" shall mean any federal,  state
or local laws, ordinances,  codes, regulations,  rules, policies and orders that
are intended to assure the  protection  of the  environment,  or that  classify,
regulate,  call for the  remediation  of, require  reporting with respect to, or
list or  define  air,  water,  groundwater,  solid  waste,  hazardous  or  toxic
substances, materials, wastes, pollutants or contaminants, or which are intended
to assure  the safety of  employees,  workers or other  persons,  including  the
public.

                         (ii)  "Hazardous  Materials"  shall  mean any  toxic or
hazardous  substance,  material or waste or any  pollutant  or  contaminant,  or
infectious or radioactive  substance or material,  including without limitation,
those  substances,  materials  and  wastes  defined  in or  regulated  under any
Environmental Laws.

                      (b) WI is  not  and  has  not  been  in  violation  of any
Environmental  Law relating to the  properties  or facilities of WI at which any
part of WI's  business  is or has been  conducted.  WI has not used,  generated,
manufactured  or stored on or under any part of its  properties or facilities at
which any part of WI's business is or has been  conducted,  or transported to or
from any part thereof,  any Hazardous  Materials in violation of any  applicable
Environmental Laws. There has not been any presence, disposal, or release of any
Hazardous  Materials on, from or under any part of WI's properties or facilities
at which any part of WI's business is or has been conducted.  No civil, criminal
or  administrative  action,  proceeding or  investigation is pending or, to WI's
knowledge,  threatened  against  WI,  and  WI is  not  aware  of  any  facts  or
circumstances  which could form the basis for assertion of a claim or liability,
regarding non-compliance with Environmental Laws relating to WI's business.

                  3.20 Taxes.

                      (a)  For   purposes  of  this   Agreement,   a  "Tax"  or,
collectively, "Taxes" means any and all federal, state, local and foreign taxes,
assessments  and other similar  governmental  charges,  duties and  impositions,
including  taxes  based upon or  measured by gross  receipts,  income,  profits,
sales,  use and occupation,  and value added, ad valorem,  transfer,  franchise,
withholding, payroll, recapture, employment, excise and property taxes, together
with all interest,  penalties and additions imposed with respect to such amounts
and any obligations  under any agreements or arrangements  with any other person
with  respect  to such  amounts  and  including  any  liability  for  taxes of a
predecessor entity.

                      (b)  Each  of  the  Company  and  its  Subsidiaries   have
accurately prepared and timely filed (or will so file) all federal, state, local
and foreign returns,  estimates,  information statements and reports relating to
any and all  Taxes  concerning  or  attributable  to the  Company  or any of its
Subsidiaries  or to  their  operations  ("Returns")  required  to be filed at or
before the Closing  Date,  and such Returns are true and correct in all material
respects and have been  completed in all material  respects in  accordance  with
applicable  law. Each of the Company and its  Subsidiaries  has disclosed on its
federal income Tax returns all positions taken therein that could give rise to a
substantial  understatement  of federal income tax within the meaning of Section
6662 of the Code.

                      (c) Each of the  Company  and its  Subsidiaries  as of the
Closing  Date:  (i) will have paid all Taxes it is  required to pay prior to the
Closing  Date and (ii) will have  withheld  with  respect to its  employees  all
federal  and state  income  taxes,  FICA,  FUTA and other  Taxes  required to be
withheld,  except for Taxes  contested in good faith by appropriate  proceedings
for which adequate reserves have been taken.



                                       60



                      (d) There is no Tax  deficiency  outstanding,  proposed or
assessed against the Company or any of its Subsidiaries that is not reflected as
a  liability  on the  Company  Balance  Sheet nor has the  Company or any of its
Subsidiaries  executed any waiver of any statute of  limitations on or extending
the period for the assessment or collection of any Tax.

                      (e) Neither the  Company nor any of its  Subsidiaries  has
any liability  for unpaid  federal,  state,  local or foreign Taxes that has not
been accrued for or reserved on the Company Balance Sheet,  whether  asserted or
unasserted, contingent or otherwise.

                      (f) No audit or other  examination  of any  Return  of the
Company or any of its Subsidiaries is presently in progress, nor has the Company
or any of its  Subsidiaries  been  notified  of any request for such an audit or
other examination.

                      (g) The Company has made  available  to Buyer or its legal
counsel copies of all foreign,  federal and state income and all state sales and
use Returns for the Company and all its Subsidiaries filed for all periods since
their respective inceptions.

                      (h) There are (and immediately  following the Closing Date
there will be) no liens,  pledges,  charges,  claims,  restrictions on transfer,
mortgages,  security interests or other encumbrances of any sort  (collectively,
"Liens") on the assets of the Company nor any of its Subsidiaries relating to or
attributable to Taxes other than Liens for Taxes not yet due and payable.

                      (i) Neither the  Company nor any of its  Subsidiaries  has
knowledge of any basis for the assertion of any claim  relating or  attributable
to Taxes which, if adversely determined,  would result in any Lien on the assets
of the Company or any of its Subsidiaries.

                      (j)  None  of  the  assets  of the  Company  of any of its
Subsidiaries  are treated as  "tax-exempt  use  property"  within the meaning of
Section 168(h) of the Code.

                      (k)  As of  the  Closing  Date,  there  will  not  be  any
contract,  agreement,  plan or  arrangement,  including  but not  limited to the
provisions of this  Agreement,  covering any employee or former  employee of the
Company or any of its Subsidiaries  that,  individually or  collectively,  could
give rise to the  payment of any  amount  that  would not be  deductible  by the
Company or any of its Subsidiaries as an expense under applicable law.

                      (l) Neither the  Company nor any of its  Subsidiaries  has
filed any consent  agreement  under Section 341(f) of the Code or agreed to have
Section 341(f)(4) of the Code apply to any disposition of a subsection (f) asset
(as defined in Section 341(f)(4) of the Code) owned by the Company or any of its
Subsidiaries.

                      (m) Neither the Company nor any of its  Subsidiaries  is a
party  to,  or owes  any  amount  under,  any Tax  sharing,  indemnification  or
allocation  agreement.  Neither the Company nor any of its  Subsidiaries (i) has
been a member of an affiliated  group filing a  consolidated  federal income Tax
return  (other than a group the common  parent of which was the Company) or (ii)
has any liability for Taxes of any person (other than any of the Company and its
Subsidiaries)  under Treas.  Reg. Section 1.1502-6 (or any similar  provision of
state,  local or foreign  law),  as a transferee  or  successor,  by contract or
otherwise.

                      (n) Each of the Company's and its  Subsidiaries' Tax basis
in its assets for purposes of determining its future amortization,  depreciation
and  other  federal  income  Tax  deductions  is  accurately  reflected  on  its
respective  Tax  books  and  records.  WI  Disclosure  Schedule  sets  forth the
following  information  with respect to each of the Company and its Subsidiaries
(or with respect to each of the Subsidiaries) as of the most recent  practicable
date: (i) the basis of the stockholder(s) of any Subsidiary it its stock (or the
amount of any excess loss account);  (ii) the amount of any net operating  loss,
net capital loss,  unused  investment or other  credit,  unused  foreign tax, or
excess charitable  contribution allocable to the Company or any Subsidiary;  and
(iii) the amount of any  deferred  gain or loss  allocable to the Company or any
Subsidiary arising out of any deferred intercompany transaction.

                      (o) Neither the Company nor any of its Subsidiaries is and
has not been at any time, a "United  States real property  holding  corporation"
within the meaning of Section 897(c)(2) of the Code.


                                       61

                      (p) Except as may be required as a result of the Purchase,
the  Company  and its  Subsidiaries  have not been and will not be  required  to
include any adjustment in taxable income for any Tax period (or portion thereof)
pursuant to Section 481 or Section 263A of the Code or any comparable  provision
under  state or  foreign  Tax laws as a result  of the  transactions,  events or
accounting methods employed prior to Closing.

                      (q) WI Disclosure  Schedule  lists (i) any Tax  exemption,
Tax  holiday or other  Tax-sparing  arrangement  that the  Company or any of its
subsidiaries has in any jurisdiction,  including the nature,  amount and lengths
of such Tax exemption, Tax holiday or other Tax-sparing arrangement and (ii) any
expatriate  tax  programs  or  policies  affecting  the  Company  or  any of its
Subsidiaries.  Each of the Company and its Subsidiaries is in full compliance in
all material respects with all terms and conditions required to maintain any Tax
exemption,  Tax  holiday  or  other  Tax-sparing  arrangement  or  order  of any
Governmental  Entity  and the  consummation  of the  Purchase  will not have any
adverse  effect on the  continued  validity  and  effectiveness  of any such Tax
exemption, Tax holiday or other Tax-sparing arrangement or order.

                  3.21 Employee Benefit Plans.

                      (a) The WI Disclosure  Schedule lists,  with respect to WI
and any trade or business  (whether or not  incorporated)  which is treated as a
single  employer  with WI (an "ERISA  Affiliate")  within the meaning of Section
414(b), (c), (m) or (o) of the Code, (i) all material employee benefit plans (as
defined in Section 3(3) of the Employee  Retirement Income Security Act of 1974,
as amended  ("ERISA")),  (ii) each loan to a  non-officer  employee in excess of
$5,000,  loans to officers and directors and any stock option,  stock  purchase,
phantom stock, stock appreciation  right,  supplemental  retirement,  severance,
sabbatical,  medical,  dental,  vision care,  disability,  employee  relocation,
cafeteria  benefit (Code Section 125) or dependent care (Code Section 129), life
insurance  or accident  insurance  plans,  programs or  arrangements,  (iii) all
bonus,  pension,  profit sharing,  savings,  deferred  compensation or incentive
plans,  programs or  arrangements,  (iv) other fringe or employee benefit plans,
programs or arrangements  that apply to senior  management of WI and that do not
generally  apply to all employees,  and (v) any current or former  employment or
executive  compensation  or severance  agreements,  written or otherwise,  as to
which  unsatisfied  obligations  of WI of  greater  than  $5,000  remain for the
benefit  of or  relating  to,  any  present or former  employee,  consultant  or
director of WI (together, the "WI Employee Plans").

                      (b) WI has  furnished  to OWT a  copy  of  each  of the WI
Employee Plans and related plan documents (including trust documents,  insurance
policies or contracts,  employee  booklets,  summary plan descriptions and other
authorizing documents, and, to the extent still in its possession,  any material
employee  communications  relating  thereto)  and has,  with  respect to each WI
Employee  Plan which is subject to  reporting  requirements  under  ERISA or the
Code,  provided  copies of the Form 5500  reports  filed for the last three plan
years. Any WI Employee Plan intended to be qualified under Section 401(a) of the
Code  has  either  obtained  from  the  Internal  Revenue  Service  a  favorable
determination  letter as to its qualified  status under the Code,  including all
amendments  to the Code  effected  by the Tax Reform Act of 1986 and  subsequent
legislation (to the extent required by the Code), or has applied to the Internal
Revenue Service for such a  determination  letter prior to the expiration of the
requisite  period under  applicable  Treasury  Regulations  or Internal  Revenue
Service  pronouncements in which to apply for such  determination  letter and to
make any amendments necessary to obtain a favorable  determination,  or has been
established  under a standardized  prototype plan for which an Internal  Revenue
Service  opinion letter has been obtained by the plan sponsor and is valid as to
the adopting  employer.  WI has also furnished OWT with the most recent Internal
Revenue Service determination or opinion letter issued with respect to each such
WI  Employee  Plan,  and nothing has  occurred  since the  issuance of each such
letter which could reasonably be expected to cause the loss of the tax-qualified
status of any WI Employee Plan subject to Code Section 401(a).

                      (c) (i) None of the WI Employee Plans promises or provides
retiree medical or other retiree welfare benefits to any person;  (ii) there has
been no  "prohibited  transaction,"  as such term is defined  in Section  406 of
ERISA and Section 4975 of the Code, with respect to any WI Employee Plan,  which
could  reasonably  be expected to have,  in the  aggregate,  a Material  Adverse
Effect; (iii) each WI Employee Plan has been administered in accordance with its
terms  and in  compliance  with  the  requirements  prescribed  by any  and  all
statutes,  rules and regulations (including ERISA and the Code), except as would
not  have,  in the  aggregate,  a  Material  Adverse  Effect,  and  WI and  each
subsidiary or ERISA Affiliate have performed all material  obligations  required
to be performed by them under,  are not in any material respect in default under
or violation  of and have no  knowledge of any material  default or violation by
any other party to, any of the WI Employee Plans;  (iv) neither WI nor any other
ERISA  Affiliate is subject to any  liability  or penalty  under  Sections  4976
through  4980 of the  Code or  Title I of ERISA  with  respect  to any of the WI
Employee Plans; (v) all material  contributions required to be made by WI or any
other ERISA  Affiliate to any WI Employee Plan have been made on or before their
due dates and a reasonable  amount has been accrued for contributions to each WI
Employee Plan for the current plan years;  (vi) with respect to each WI Employee
Plan,  no  "reportable  event"  within  the  meaning  of  Section  4043 of ERISA
(excluding any such event for which the thirty (30) day notice  requirement  has
been  waived  under the  regulations  to  Section  4043 of ERISA)  nor any event
described in Section 4062,  4063 or 4041 or ERISA has occurred;  and (vii) no WI
Employee Plan is covered by, and neither WI or ERISA

                                       62


Affiliate has incurred or expects to incur any liability under Title IV of ERISA
or Section 412 of the Code.  With  respect to each WI Employee  Plan  subject to
ERISA as either an employee  pension  plan within the meaning of Section 3(2) of
ERISA or an employee  welfare benefit plan within the meaning of Section 3(l) of
ERISA, WI has prepared in good faith and timely filed all requisite governmental
reports  (which were true and correct as of the date filed) and has properly and
timely  filed and  distributed  or posted all notices  and reports to  employees
required  to be  filed,  distributed  or  posted  with  respect  to each such WI
Employee Plan. No suit,  administrative  proceeding,  action or other litigation
has been  brought,  or to the  knowledge  of WI is  threatened,  against or with
respect to any such WI Employee Plan,  including any audit or inquiry by the IRS
or United States  Department of Labor.  Neither WI nor any other ERISA Affiliate
is a party  to,  or has made  any  contribution  to or  otherwise  incurred  any
obligation under, any "multiemployer plan" as defined in Section 3(37) of ERISA.

                      (d) With respect to each WI Employee  Plan, WI and each of
its United States subsidiaries have complied with (i) the applicable health care
continuation  and  notice   provisions  of  the   Consolidated   Omnibus  Budget
Reconciliation Act of 1985 ("COBRA") and the proposed regulations thereunder and
(ii)  the  applicable  requirements  of the  Family  Leave  Act of 1993  and the
regulations  thereunder,  except to the extent that such failure to comply would
not in the aggregate, have a Material Adverse Effect.

                      (e) The consummation of the  transactions  contemplated by
this  Agreement  will not (i) entitle  any  current or former  employee or other
service provider of WI or any other ERISA Affiliate to severance benefits or any
other payment (including, without limitation,  unemployment compensation, golden
parachute  or bonus),  except as  expressly  provided in this  Agreement or (ii)
accelerate the time of payment or vesting of any such benefits,  or increase the
amount of compensation due any such employee or service provider.

                      (f) There has been no amendment to, written interpretation
or  announcement  (whether or not  written)  by WI or any other ERISA  Affiliate
relating to, or change in  participation or coverage under, any WI Employee Plan
which would  materially  increase the expense of maintaining such plan above the
level of expense  incurred  with respect to that plan for the most recent fiscal
year included in WI's financial statements.

                  3.22 Employee Matters.  WI is in compliance with all currently
applicable laws and regulations respecting  discrimination in employment,  terms
and conditions of employment,  wages,  hours and occupational  safety and health
and employment practices, except for such noncompliance as has not and would not
reasonably be expected to have had a Material  Adverse  Effect on WI, and is not
engaged in any unfair labor  practice.  There are no pending  claims  against WI
under any workers'  compensation plan or policy or for long term disability.  WI
has no material  obligations under COBRA with respect to any former employees or
beneficiaries thereunder.  There are no proceedings pending or, to the knowledge
of WI, threatened, between WI and its employees, which proceedings have or could
reasonably  be  expected  to have a Material  Adverse  Effect on WI. WI is not a
party to any collective  bargaining  agreement or other labor union contract nor
does WI know of any activities or proceedings of any labor union to organize its
employees.  There has been no claim  against WI based on actual or alleged race,
age, sex, disability or other harassment or discrimination,  or similar tortuous
conduct, nor, to WI's knowledge, is there any basis for such claim. In addition,
WI has provided all  employees  with all  relocation  benefits,  stock  options,
bonuses and incentives, and all other compensation earned up through the date of
this Agreement.

                  3.23 Insurance.  The WI Disclosure  Schedule lists each policy
of insurance and bonds held by WI. WI has policies of insurance and bonds of the
type and in amounts  customarily  carried by persons  conducting  businesses  or
owning assets  similar to those of WI. There is no material  claim pending under
any of such policies or bonds as to which coverage has been  questioned,  denied
or disputed by the  underwriters of such policies or bonds. All premiums due and
payable under all such policies and bonds have been paid and WI are otherwise in
compliance with the terms of such policies and bonds. WI has no knowledge of any
threatened  termination of, or material premium increase with respect to, any of
such policies.

                  3.24  Compliance  With Laws.  WI has complied  with, is not in
violation of and has not received any notices of violation  with respect to, any
federal state,  local or foreign statute,  law or regulation with respect to the
conduct of its business,  or the ownership or operation of its business,  except
for such violations or failures to comply as could not be reasonably expected to
have a Material Adverse Effect on WI.

                  3.25  Ownership of Shares and Options.  Except as set forth in
the WI  Disclosure  Schedule,  each Seller owns of record and  beneficially  the
number of shares of WI Common Stock indicated opposite such Seller's name in the
WI Disclosure  Schedule hereto, as applicable,  with full right and authority to
sell or exchange, as applicable, such securities hereunder, and upon delivery of
such shares  hereunder,  OWT will receive good title thereto,  free and clear of
all mortgages,  pledges or security  interests and not subject to any agreements
or  understandings  among any Persons  with respect to the voting or transfer of
such securities  other than those arising under agreements to which EMCON or OWT
is a party.

                                       63



                  3.26  Information  Supplied.  Neither this  Agreement,  the WI
Financial Statements,  the WI Disclosure Schedule, the Exhibits attached to this
Agreement, nor any other certificate or document furnished or to be furnished by
WI or the  Sellers  pursuant  to the terms of this  Agreement,  contains or will
contain  any untrue  statement  of a material  fact known to the  Sellers or WI,
respectively,  or omits or will omit to state a material fact  necessary to make
the  statements  contained in such  information  not  misleading in light of the
circumstances under which such statements were made.

                  3.27 Brokers or Finders.  Neither WI nor either of the Sellers
nor any of such  Sellers'  agents has  incurred  any  obligation  or  liability,
contingent or otherwise,  for brokerage or finders' fees or agents'  commissions
or other similar payment in connection  with this Agreement or the  transactions
contemplated hereby.

                  3.28 Representations  Complete. None of the representations or
warranties made by WI herein or in any Schedule or Exhibit hereto, including the
WI  Disclosure  Schedule,  or  certificate  furnished  by WI  pursuant  to  this
Agreement  or any  written  statement  furnished  to OWT  pursuant  hereto or in
connection with the transactions  contemplated  hereby,  when all such documents
are read together in their entirety,  contain,  or will contain at the Effective
Time any  untrue  statement  of a  material  fact,  or omits or will omit at the
Effective  Time to  state  any  material  fact  necessary  in  order to make the
statements  contained herein or therein, in the light of the circumstances under
which made, not misleading.

          4.  Representations and Warrantees of OWT. OWT represents and warrants
to WI as follows: 

                  4.1  Organization,  Standing and Power.  OWT is a  corporation
duly  organized,  validly  existing and in good  standing  under the laws of the
State of Delaware.

                  4.2 Authority.  OWT has, and will have as of the Closing Date,
all requisite  corporate power and authority to enter into this Agreement and to
consummate the transactions  contemplated  hereby. The execution and delivery of
this  Agreement  has,  and  as of  the  Closing  Date  the  consummation  of the
transactions  contemplated  hereby  will  have  been,  duly  authorized  by  all
necessary  corporate  action on the part of OWT.  This  Agreement  has been duly
executed and delivered by OWT and constitutes  the valid and binding  obligation
of OWT  enforceable  against OWT in  accordance  with its terms,  except as such
enforceability  may be limited by  bankruptcy,  insolvency,  moratorium or other
similar  laws  affecting  or relating to  creditors'  rights  generally,  and is
subject to general  principles  of equity.  The  execution  and delivery of this
Agreement by OWT does not, and the consummation of the transactions contemplated
hereby will not  conflict  with or result in any  violation  of (with or without
notice  or lapse of time,  or both)  (i) any  provision  of the  Certificate  of
Incorporation or Bylaws of OWT, or (ii) any material mortgage, indenture, lease,
contract  or other  agreement  or  instrument,  permit,  concession,  franchise,
license,  judgment,  order, decree, statute, law, ordinance,  rule or regulation
applicable  to OWT or any of its  properties  or assets.  No consent,  approval,
order or  authorization  of, or  registration,  declaration  or filing with, any
Governmental Entity is required by or with respect to OWT in connection with the
execution and delivery of this Agreement or the consummation of the transactions
contemplated  hereby,  except  for  such  consents,   authorizations,   filings,
approvals and  registrations  which,  if not obtained or made,  would not have a
Material  Adverse  Effect on OWT and would not  prevent or  materially  alter or
delay any of the transactions contemplated by this Agreement.

          5. Preclosing Covenants of WI

                  5.1 Conduct of Business of WI. During the period from the date
of this  Agreement and continuing  until the earlier of the  termination of this
Agreement or the Closing, WI agrees (except to the extent expressly contemplated
by this Agreement or as consented to in writing by OWT), to carry on its and its
subsidiaries' business in the usual regular and ordinary course in substantially
the same manner as heretofore conducted; to pay and to cause its subsidiaries to
pay debts and Taxes when due subject (i) to good faith  disputes over such debts
or Taxes and (ii) to OWT's  consent to the  filing of  material  Tax  Returns if
applicable;  to pay or  perform  other  obligations  when  due,  and to use  all
reasonable efforts to preserve intact its present business  organizations,  keep
available  the services of its and its  subsidiaries'  present  officers and key
employees and preserve its and its subsidiaries'  relationships  with customers,
suppliers,  distributors,  licensers,  licensees,  and  others  having  business
dealings with it or its subsidiaries,  to the end that its and its subsidiaries'
goodwill and ongoing  businesses  shall be unimpaired at the Effective  Time. WI
agrees to promptly notify OWT of (x) any event or occurrence not in the ordinary
course of its or its subsidiaries' business, and of any event which could have a
Material Adverse Effect on WI and (y) any material change in its  capitalization
as set forth in Section 3.4. Without limiting the foregoing, except as expressly
contemplated by this Agreement or the WI Disclosure  Schedule,  WI shall not do,
cause or  permit  any of the  following,  or allow,  cause or permit  any of its
subsidiaries  to do,  cause or permit any of the  following,  without  the prior
written consent of OWT:


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                      (a) Charter  Documents.  Cause or permit any amendments to
its Articles of Incorporation or Bylaws;
                               

                      (b) Dividends;  Changes in Capital  Stock.  Declare or pay
any  dividends  on or make any other  distributions  (whether in cash,  stock or
property)  in  respect  of  any of its  capital  stock,  or  split,  combine  or
reclassify  any of its capital  stock or issue or authorize  the issuance of any
other  securities in respect of, in lieu of or in substitution for shares of its
capital stock, or repurchase or otherwise acquire,  directly or indirectly,  any
shares  of its  capital  stock  except  from  former  employees,  directors  and
consultants in accordance with agreements providing for the repurchase of shares
in connection with any termination of service to it or its subsidiaries;

                      (c) Material  Contracts.  Enter into any material contract
or commitment,  or violate,  amend or otherwise modify or waive any of the terms
of any of its material contracts,  other than in the ordinary course of business
consistent with past practice;

                      (d)  Issuance  of  Securities.  Issue,  deliver or sell or
authorize or propose the  issuance,  delivery or sale of, or purchase or propose
the purchase of, any shares of its capital stock or securities convertible into,
or subscriptions, rights, warrants or options to acquire, or other agreements or
commitments  of any  character  obligating  it to issue any such shares or other
convertible securities;

                      (e)  Intellectual  Property.  Transfer  to any  person  or
entity any rights to its Intellectual Property other than in the ordinary course
of business consistent with past practice;

                      (f) Exclusive  Rights.  Enter into or amend any agreements
pursuant  to which any  other  party is  granted  exclusive  marketing  or other
exclusive  rights of any type or scope with  respect to any of its  products  or
technology;

                      (g)  Dispositions.   Sell,  lease,  license  or  otherwise
dispose  of or  encumber  any of its  properties  or assets  which are  material
individually or in the aggregate, to its business, except in the ordinary course
of business consistent with past practice;

                      (h)  Indebtedness.  Incur any  indebtedness  for  borrowed
money or guarantee any such indebtedness or issue or sell any debt securities or
guarantee any debt securities of others;

                      (i)  Agreements.  Enter  into,  terminate  or amend,  in a
manner  which  will  adversely  affect  the  business  of WI (i)  any  agreement
involving an obligation to pay or the right to receive $5,000 or more,  (ii) any
agreement relating to the license,  transfer or other disposition or acquisition
of  intellectual  property  rights or rights to market or sell WI  products,  or
(iii) any other agreement which is material to the business or prospects of WI.

                      (j) Payment of Obligations.  Pay, discharge or satisfy, in
an  amount  in  excess of $5,000  in the  aggregate,  any  claim,  liability  or
obligation (absolute, accrued, asserted or unasserted,  contingent or otherwise)
arising other than in the ordinary  course of business,  other than the payment,
discharge or satisfaction of liabilities reflected or reserved against in the WI
Financial Statements;

                      (k) Capital  Expenditures.  Make any capital expenditures,
capital  additions  or capital  improvements  except in the  ordinary  course of
business and consistent with past practice;

                      (l)  Insurance.   Materially  reduce  the  amount  of  any
material insurance coverage provided by existing insurance policies;

                      (m) Termination or Waiver. Terminate or waive any right of
substantial value, other than in the ordinary course of business;

                      (n) Employee  Benefit  Plans;  New Hires;  Pay  Increases.
Adopt or amend any employee  benefit or stock  purchase or option plan,  or hire
any new employee, pay any special bonus or special remuneration (except payments
made pursuant to written agreements outstanding on the date hereof), or increase
the salaries or wage rates of its  employees  except in the  ordinary  course of
business in accordance with its standard past practice;

                                       65


                      (o)  Severance   Arrangements.   Grant  any  severance  or
termination  pay (i) to any  director  or officer or (ii) to any other  employee
except (A) payments made pursuant to written agreements  outstanding on the date
hereof or (B)  grants  which are made in the  ordinary  course  of  business  in
accordance with its standard past practice;

                      (p)  Lawsuits.  Commence a lawsuit  other than (i) for the
routine  collection  of  bills,  (ii)  in such  cases  where  it in  good  faith
determines that failure to commence suit would result in the material impairment
of a valuable  aspect of its business,  provided that it consults with OWT prior
to the filing of such a suit, or (iii) for a breach of this Agreement;

                      (q)  Acquisitions.  Acquire or agree to acquire by merging
or consolidating  with, or by purchasing a substantial portion of the assets of,
or  by  any  other  manner,  any  business  or  any  corporation,   partnership,
association  or other  business  organization  or division  thereof or otherwise
acquire or agree to acquire any assets which are material individually or in the
aggregate, to its business;

                      (r) Taxes.  Other than in the ordinary course of business,
make or change any  material  election in respect of Taxes,  adopt or change any
accounting  method in  respect  of Taxes,  file any  material  Tax Return or any
amendment to a material Tax Return, enter into any closing agreement, settle any
material claim or assessment in respect of Taxes, or consent to any extension or
waiver of the limitation  period  applicable to any material claim or assessment
in respect of Taxes;

                      (s)Revaluation.  Revalue  any  of  its  assets,  including
without  limitation  writing down the value of inventory or writing off notes or
accounts receivable other than in the ordinary course of business; or

                      (t) Other.  Take or agree in writing or otherwise to take,
any of the  actions  described  in Sections  5.1 (a)  through (s) above,  or any
action which would cause a material breach of its  representations or warranties
contained in this Agreement or prevent it from materially performing or cause it
not to materially perform its covenants hereunder.

                  5.2 Access to Information.  Until the Closing,  WI shall allow
OWT and its agents and representatives  reasonable access upon reasonable notice
and  during  normal  working  hours to its files,  books,  records  and  offices
including,  without  limitation,  any and all  information  relating  to  taxes,
commitments,  contracts,  leases,  licenses and personal  property and financial
condition.  Until the Closing,  WI shall cause its accountants to cooperate with
OWT, OWT and their agents and  representatives in making available all financial
information requested,  including,  without limitation, the right to examine all
working  papers  pertaining to all financial  statements  prepared or audited by
such accountants.

                  5.3  Exclusivity..  During  the  period  from the date of this
Agreement  until the earlier of the termination of this Agreement or the Closing
Date, WI or the Sellers shall not, directly or indirectly,  through any officer,
director, employee, representative or agent, (i) solicit, initiate, or encourage
any inquiries or proposals that  constitute,  or could reasonably be expected to
lead to, a proposal or offer for a merger, consolidation,  business combination,
sale of substantial  assets,  sale of shares of capital stock (including without
limitation by way of a tender offer) or similar transactions involving WI, other
than the  transactions  contemplated  by this  Agreement  (any of the  foregoing
inquiries or proposals  being referred to in this Agreement as a "WI Acquisition
Proposal"),  (ii) engage in negotiations or discussions  concerning,  or provide
any  non-public  information  to  any  person  or  entity  relating  to,  any WI
Acquisition Proposal, or (iii) agree to, approve or recommend any WI Acquisition
Proposal.

                      (a) WI or the  Sellers  shall  notify  OWT no  later  than
twenty-four  (24)  hours  after  receipt  by WI  (or  its  advisors)  of  any WI
Acquisition Proposal or any request for nonpublic information in connection with
a WI Acquisition  Proposal or for access to the properties,  books or records of
WI by any person or entity that informs WI that it is considering making, or has
made, a WI Acquisition Proposal. Such notice shall be made orally and in writing
and shall  indicate  in  reasonable  detail the  identity of the offeror and the
terms and conditions of such proposal, inquiry or contact.

          6. Mutual Covenants..

                  6.1 No Public Announcement.  Neither WI nor OWT shall make any
public  announcement  concerning  this  Agreement,  any memos,  letters or other
agreements  or the  discussions  between  the parties  relating to the  Purchase
including the Letter of Intent dated September 21, 1998, between OWT and WI (the
"Letter of Intent") without the prior written approval


                                       66



of the other party, which approval will not be delayed or unreasonably withheld;
provided that either party may make disclosure if required under applicable law,
but only after reasonable consultation with the other.

                  6.2 Consents;  Cooperation.. Each of OWT and WI shall promptly
apply for or otherwise  seek,  and use  reasonable  best efforts to obtain,  all
consents and approvals required to be obtained by it for the consummation of the
transactions  contemplated  by this  Agreement  and  shall use  reasonable  best
efforts to obtain all necessary consents, waivers and approvals under any of its
material  contracts in  connection  with such  transactions  for the  assignment
thereof or otherwise.

                  6.3  Legal  Requirements.  Each of OWT and WI  will  take  all
reasonable  actions  necessary to comply  promptly  with all legal  requirements
which  may  be  imposed  on  them  with  respect  to  the  consummation  of  the
transactions contemplated by this Agreement and will promptly cooperate with and
furnish  information to any party hereto  necessary in connection  with any such
requirements  imposed upon such other party in connection with the  consummation
of the transactions  contemplated by this Agreement and will take all reasonable
actions necessary to obtain (and will cooperate with the other parties hereto in
obtaining) any consent, approval, order or authorization of or any registration,
declaration or filing with, any Governmental Entity or other person, required to
be obtained or made in connection with the taking of any action  contemplated by
this Agreement.

                  6.4  Confidentiality.  The parties acknowledge that EMCON, OWT
and WI have previously executed a non-disclosure  agreement dated August 1, 1998
(the  "Non-Disclosure  Agreement"),  which  Non-Disclosure  Agreement  is hereby
incorporated  herein by reference and shall continue in full force and effect in
accordance with its terms.

                  6.5 Public  Disclosure.  Unless  otherwise  permitted  by this
Agreement,  OWT and WI shall  consult with each other  before  issuing any press
release or otherwise  making any public statement or making any other public (or
non-confidential)  disclosure  (whether  or  not  in  response  to  an  inquiry)
regarding the terms of this Agreement and the transactions  contemplated hereby,
and neither  shall issue any such press  release or make any such  statement  or
disclosure  without the prior approval of the other (which approval shall not be
unreasonably  withheld),  except  as may be  required  by law or by  obligations
pursuant to any listing agreement with any national  securities exchange or with
NASDAQ.

                  6.6 Further  Assurances.  Prior to and  following the Closing,
each party agrees to cooperate  fully with the other parties and to execute such
further  instruments,  documents and agreements and to give such further written
assurances, as may be reasonably requested by any other party to better evidence
and reflect the transactions  described  herein and  contemplated  hereby and to
carry into effect the intents and purposes of this Agreement.

                  6.7 Expenses. WI is authorized to incur expenses for legal and
accounting  services to review this  Agreement,  the  Employment  Agreement  and
Non-Competition  Agreement with Bruce Nave and the related documents  comprising
the transactions  contemplated herein with the limitation that any such expenses
that  exceed  $10,000  shall  be borne  exclusively  by Bruce  and  Marcia  Nave
personally.  Such expenses  shall be paid after the Closing  within a reasonable
time after  submission  of an itemized  billing  statement by legal  counsel and
accounting advisor.

                  6.8  EMCON  Stock  Options.  After  the  Closing,  options  to
purchase an  aggregate  10,000  shares of EMCON Common Stock shall be granted to
employees  of WI  consistent  with the  standard  terms of the EMCON  1998 Stock
Option Plan.

          7.  Conditions to Each Party's  Obligations.  The  obligations of each
party to close the transactions contemplated under this Agreement are subject to
the fulfillment or  satisfaction,  on or before the Closing Date, of each of the
following  conditions  (any of which may be waived by the party  benefiting from
such condition, but only in a writing executed by such party):

                  7.1 No  Injunctions or  Restraints;  Illegality.  No temporary
restraining order,  preliminary or permanent injunction or other order issued by
any court of competent  jurisdiction  or other legal or regulatory  restraint or
prohibition  preventing the  consummation of the Purchase shall be and remain in
effect,  nor  shall  any  proceeding  brought  by an  administrative  agency  or
commission  or other  governmental  authority  or  instrumentality,  domestic or
foreign,  seeking any of the  foregoing be pending,  which would have a Material
Adverse  Effect on OWT or WI after the  Closing,  nor shall  there be any action
taken, or any statute, rule, regulation or order enacted,  entered,  enforced or
deemed applicable to the Purchase,  which makes the consummation of the Purchase
illegal.  In the event an injunction or other order shall have been issued, each
party agrees to use its reasonable  diligent  efforts to have such injunction or
other order lifted.


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                  7.2  Governmental  Approval.  OWT and WI and their  respective
subsidiaries shall have timely obtained from each applicable Governmental Entity
all approvals, waivers and consents, if any, necessary for consummation of or in
connection with the Purchase and the several  transactions  contemplated hereby,
other than filings and  approvals  relating to the  Purchase or affecting  OWT's
ownership  of WI or any of its  properties  if failure to obtain such  approval,
waiver or consent  would not have a Material  Adverse  Effect on OWT or WI after
the Closing.

          8. Conditions to the Sellers' Obligations. The Sellers' obligations to
close the  transactions  contemplated  under this  Agreement  are subject to the
fulfillment  or  satisfaction,  on or before the  Closing  Date,  of each of the
following  conditions (any of which may be waived by the Sellers,  but only in a
writing signed by either Seller):

                  8.1   Accuracy  of   Representations   and   Warranties.   The
representations  and  warranties  of OWT set forth in Section 4 shall be true in
all  material  respects  on and as of the  Closing  Date with the same force and
effect as if they had been made at the Closing,  and the Sellers shall receive a
certificate to such effect signed by an officer of OWT.

                  8.2  Covenants  and  Conditions.  All of the  covenants of OWT
contained in Sections 6 and all of the conditions set forth in Section 7 of this
Section 8 shall have been performed,  complied with or satisfied in all material
respects on or before the Closing,  and the Sellers  shall receive a certificate
to such effect signed by an officer of OWT.

                  8.3 Employment and Non-Competition  Agreements. OWT shall have
executed and delivered to Bruce Nave an Employment and Non-Competition Agreement
substantially in the form of Exhibit B attached hereto.

                  8.4 Documents.  All of the documents  required to be delivered
by OWT  pursuant to this  Agreement  shall have been  delivered  and the Sellers
shall be reasonably satisfied with the content and form of all such documents.

                  8.5 Release of Personal  Guaranty.  EMCON,  WI and each of the
Sellers shall have entered into a Letter  Agreement,  substantially  in the form
attached hereto as Exhibit C, agreeing to and  acknowledging  the release of the
personal  guaranty  granted  by each  of the  Sellers  to  EMCON  pursuant  to a
promissory note of WI dated October 23, 1998 in the principal amount of $27,000,
a  promissory  note of WI dated  October  29,  1998 in the  principal  amount of
$10,000 and a promissory  note of WI dated  November  30, 1998 in the  principal
amount of $60,000.

          9. Conditions to OWT's Obligations. The obligations of OWT are subject
to the  fulfillment or  satisfaction,  on or before the Closing Date, of each of
the following  conditions  (any one of which may be waived by OWT, but only in a
writing signed by OWT):

                  9.1   Accuracy  of   Representations   and   Warranties.   The
representations  and  warranties  of WI and the Sellers  contained  in Section 3
shall be true in all material  respects,  on and as of the Closing Date with the
same  force and  effect as if they had been made at the  Closing,  and OWT shall
have received a certificate to such effect signed by each of the Sellers.

                  9.2 Covenants and Conditions.  All material  respects with all
of the  covenants  of the Sellers  contained  in Sections 5 and 0 and all of the
conditions set forth in Section 7 and this Section 9 shall have been  performed,
complied  with or satisfied  in all material  respects on or before the Closing,
and OWT shall have received a  certificate  to such effect signed by each of the
Sellers.

                  9.3  Certificate of Secretary.  WI shall have delivered to OWT
copies of its Articles of Incorporation,  Bylaws and all resolutions  adopted by
the Board of Directors and  shareholders of WI pertaining to the Purchase,  each
certified by the  Secretary or an Assistant  Secretary of WI as being  accurate,
complete and in full force and effect.

                  9.4 No Material Adverse Change.  Since the Balance Sheet Date,
there shall not have  occurred  any  material  adverse  change in the  financial
condition,   properties,  assets  (including  intangible  assets),  liabilities,
business, operations or results of operations of WI, taken as a whole.

                  9.5 Repayment and Cancellation of Promissory  Note.. OWT shall
have received cash payment from the Sellers against the promissory note of WI in
the  principal  amount of  $89,000,  and such  promissory  note and any  accrued
interest  shall be canceled  upon receipt of such payment  pursuant to the terms
thereof.

                  9.6 Third Party  Consents.  OWT shall have been furnished with
evidence  satisfactory  to it of the consent or approval of those  persons whose
consent or approval is required in connection with the Purchase.


                                       68


                  9.7  Employment  and  Non-Competition  Agreements.  Bruce Nave
shall have executed and delivered the Employment and
Non-Competition Agreement.

                  9.8  Delivery of Stock  Certificates.  The Sellers  shall have
delivered to OWT stock certificates  representing all of the outstanding capital
stock of WI  endorsed  or  accompanied  by executed  assignments  separate  from
certificate.

                  9.9  Opinion of  Counsel;  WI Legal  Expenses.  OWT shall have
received a written opinion from the offices of Mark A. Sippel,  P.C., counsel to
WI ("Sippel"), in substantially the form attached hereto as Exhibit D. OWT shall
have  received a  statement  from Sippel  stating  the amount of legal  expenses
accrued by WI as of the Closing  Date,  and the Sellers  shall have  delivered a
check  to OWT for any  legal  and  accounting  expenses  in the  aggregate  over
$10,000, pursuant to Section 6.7 hereof.

                  9.10  Termination  of  Employment  Agreements.  WI shall  have
terminated any oral or written  employment  agreements between WI and any of its
employees.

                  9.11 Documents.  All of the documents required to be delivered
by WI or the Sellers  pursuant to this  Agreement  shall have been delivered and
OWT  shall  be  reasonably  satisfied  with  the  content  and  form of all such
documents.

          10. Termination.

                  10.1 Termination. This Agreement may be terminated at any time
prior to the Closing as follows:

                      (a) by the mutual  written  consent of each of the parties
hereto;

                      (b) by either WI or OWT, if the  Closing has not  occurred
by December  31,  1998,  provided  that the right to  terminate  this  Agreement
pursuant  to this  Section  10.1 (b) shall not be  available  to any party whose
failure to fulfill any obligation or condition under this Agreement has been the
cause of or  resulted  in the  failure of the Closing to occur on or before such
date;

                      (c)  by  either  OWT  or  WI  if  a  court  of   competent
jurisdiction or other  Governmental  Entity having  jurisdiction over the matter
shall have issued a  nonappealable  final  order,  decree or ruling or taken any
other  action,  in each  case  having  the  effect of  permanently  restraining,
enjoining or otherwise prohibiting the Purchase, except, if the party relying on
such  order,  decree  or  ruling  or  other  action  has not  complied  with its
obligations under this Agreement; or

                      (d) by either OWT or WI, if there has been a breach of any
representation,  warranty,  covenant or agreement on the part of the other party
set forth in this Agreement, which breach (i) causes the conditions set forth in
Section 9.1 or 9.2 (in the case of termination by OWT) or Section 8.1 or 8.2 (in
the case of  termination by WI) not to be satisfied and (ii) shall not have been
cured within ten (10) business days following  receipt by the breaching party of
written notice of such breach from the other party.

Any  termination of this Agreement under this Section 10.1 shall be effective by
the delivery of written  notice of the  terminating  party to the other  parties
hereto.

                  10.2 Effect of  Termination.  In the event of  termination  of
this  Agreement  as provided in Section  10.1,  there shall be no  liability  or
obligation on the part of OWT, WI or their respective  officers,  directors,  or
shareholders, except to the extent that such termination results from the breach
by a party of any of its  representations,  warranties or covenants set forth in
this Agreement; provided that the provisions of Section 6.4 shall remain in full
force and effect and survive any termination of this Agreement.

                  10.3  Extension;  Waiver.  At any time prior to the  Effective
Time,  the parties  hereto,  by action taken or authorized  by their  respective
Boards of Directors, may, to the extent legally allowed, (i) extend the time for
the  performance  of any of the  obligations  or other acts of the other parties
hereto,  (ii)  waive any  inaccuracies  in the  representations  and  warranties
contained  herein or in any document  delivered  pursuant  hereto or (iii) waive
compliance  with any of the  agreements  or  conditions  contained  herein.  Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid only if set forth in a written instrument signed on behalf of such party.


                                       69



                  10.4 Obligations  Following  Termination.  In the event of the
termination of this Agreement:

                      (a) each party,  if so requested by the other party,  will
(i) return  promptly every document  (other than documents  publicly  available)
furnished to it by the other party (or any  subsidiary,  division,  associate or
affiliate of such other party) in connection with the transactions  contemplated
hereby, whether so obtained before or after the execution of this Agreement, and
any copies thereof which may have been made, and will cause its  representatives
and any  representatives  of financial  institutions and investors and others to
whom such  documents  were  furnished  promptly to return such documents and any
copies  thereof any of them may have made,  or (ii) destroy such  documents  and
cause  its  representatives  and such  other  representatives  to  destroy  such
documents,  and such party shall deliver a certificate executed by its President
or Vice President stating to such effect; and

                      (b) WI and OWT shall  continue to abide by the  provisions
of the Non-Disclosure Agreement.

          11. Miscellaneous.

                  11.1 Governing  Law. This  Agreement  shall be governed by and
construed in accordance with the laws of California that might otherwise  govern
under  applicable  principles  of conflicts of law.  Each of the parties  hereto
irrevocably  consents to the exclusive  jurisdiction of any court located within
San Mateo County, State of California,  in connection with any matter based upon
or arising  out of this  Agreement  or the  matters  contemplated  hereby and it
agrees that process may be served upon it in any manner  authorized  by the laws
of the State of  California  for such  persons and waives and  covenants  not to
assert or plead any objection which it might otherwise have to such jurisdiction
and such process.

                  11.2 Notices. All notices and other  communications  hereunder
shall be in writing and shall be deemed duly  delivered if delivered  personally
(upon  receipt),  or three (3) business days after being mailed by registered or
certified mail, postage prepaid (return receipt requested),  or one (1) business
day after it is sent by reputable  nationwide overnight courier service, or upon
transmission,  if sent via  facsimile  (with  confirmation  of  receipt)  to the
parties at the following  address (or at such other address for a party as shall
be specified by like notice):



                                       70



                  (a) if to OWT:

                      Organic Waste Technologies, Inc.
                      7550 Lucerne Drive, #110
                      Cleveland, OH
                      Attention:  Mary Geiger, Chief Financial Officer
                      Fax:  (440) 891-0300

                      with a copy to:

                      Gray Cary Ware & Freidenrich LLP
                      400 Hamilton Avenue
                      Palo Alto, CA  94301
                      Attention:  Paul A. Blumenstein, Esq.
                      Fax:  (650) 328-3699

                  (b) if to WI:

                      Western Industrial Resources Corporation
                      4711 North Falcon Drive, Suite 201
                      Mesa, AZ  85215
                      Attention:  President

                      with a copy to:

                      Gray Cary Ware & Freidenrich LLP
                      400 Hamilton Avenue
                      Palo Alto, CA  94301
                      Attention:  Paul A. Blumenstein, Esq.
                      Fax:  (650) 328-3699

                  (c) if to the Sellers:

                      Bruce and Marcia Nave
                      2236 North Rico Circle
                      Mesa, AZ 85213
                      
                      with a copy to:

                      Mark A. Sippel, P.C.
                      3260 North Hayden Road, Suite 214
                      Scottsdale, AZ 85251-6651
                      Attention:  Mark A. Sippel, Esq.

                  (d) if to EMCON:

                      EMCON
                      400 S. El Camino Real, Suite 1200
                      San Mateo, CA  94402
                      Attention:  R. Michael Momboisse, Chief Financial Officer
                      Fax:  (650) 375-0763

                      with a copy to:

                      Gray Cary Ware & Freidenrich LLP
                      400 Hamilton Avenue
                      Palo Alto, CA  94301
                      Attention:  Paul A. Blumenstein, Esq.
                      Fax:  (650) 328-3699



                                       71


                  11.3 Binding  Upon  Successors  and  Assigns.  Subject to, and
unless  otherwise  provided in, this  Agreement,  each and all of the covenants,
terms,  provisions,  and agreements  contained herein shall be binding upon, and
inure  to  the  benefit  of,  the  permitted   successors,   executors,   heirs,
representatives, administrators and assigns of the parties hereto.

                  11.4 Severability.  If any provision of this Agreement, or the
application  thereof,  shall for any  reason  and to any  extent be  invalid  or
unenforceable, the remainder of this Agreement and application of such provision
to other persons or circumstances  shall be interpreted so as best to reasonably
effect the intent of the parties  hereto.  The parties  further agree to replace
such  void or  unenforceable  provision  of  this  Agreement  with a  valid  and
enforceable provision which will achieve, to the extent possible,  the economic,
business and other purposes of the void or unenforceable provision.

                  11.5 Remedies Cumulative. Except as otherwise provided herein,
any and all  remedies  herein  expressly  conferred  upon a party will be deemed
cumulative with and not exclusive of any other remedy  conferred  hereby,  or by
law or equity  upon such  party,  and the  exercise by a party of any one remedy
will not preclude the exercise of any other remedy.

                  11.6 Entire  Agreement.  This Agreement,  the exhibits hereto,
the documents  referenced herein (including the Non-Disclosure  Agreement),  and
the exhibits thereto,  constitute the entire  understanding and agreement of the
parties  hereto  with  respect to the  subject  matter  hereof and  thereof  and
supersede  all  prior  and   contemporaneous   agreements   or   understandings,
inducements  or  conditions,  express or implied,  written or oral,  between the
parties with respect  hereto and thereto.  The express terms hereof  control and
supersede any course of performance or usage of the trade  inconsistent with any
of the terms hereof.

                  11.7  Counterparts.  This  Agreement  may be  executed  in any
number of counterparts,  each of which shall be an original as against any party
whose signature  appears thereon and all of which together shall  constitute one
and the same instrument.

                  11.8  Amendment  and  Waivers.  Any term or  provision of this
Agreement may be amended,  and the  observance of any term of this Agreement may
be waived (either generally or in a particular instance and either retroactively
or prospectively) only by a writing signed by the party to be bound thereby. The
waiver by a party of any breach  hereof for default in payment of any amount due
hereunder or default in the performance hereof shall not be deemed to constitute
a waiver of any other default or any succeeding  breach or default.  The failure
of any party to enforce any of the  provisions  hereof shall not be construed to
be a waiver of the right of such party thereafter to enforce such provisions.

                  11.9 Survival of Agreements.  Except as otherwise provided for
herein, all covenants,  agreements,  representations  and warranties made herein
shall survive the execution and delivery of this Agreement and the  consummation
of the transactions contemplated hereby.

                  11.10  Construction  of  Agreement.  This  Agreement  has been
negotiated by the respective parties hereto and their attorneys and the language
hereof shall not be construed for or against any party.  The titles and headings
herein are for  reference  purposes  only and shall not in any manner  limit the
construction of this Agreement which shall be considered as a whole.

                  11.11 Absence of Third Party Beneficiary Rights. No provisions
of this Agreement are intended,  nor shall be interpreted,  to provide or create
any  third  party  beneficiary  rights  or any  other  rights of any kind in any
client,  customer,  affiliate,  shareholder,  partner of any party hereto or any
other person or entity  unless  specifically  provided  otherwise  herein,  and,
except as so provided,  all provisions  hereof shall be personal  solely between
the parties to this Agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]


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         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as
of the date first set forth above.

WESTERN INDUSTRIAL RESOURCES              ORGANIC WASTE TECHNOLOGIES, INC.
CORPORATION 

By:  /s/ Bruce Nave
- - -----------------------------
        Bruce Nave, President             By:/s/ Mary Geiger
                                          ------------------------------------
                                          Mary Geiger, Chief Financial Officer



/s/ Bruce Nave
- - -----------------------------
    Bruce Nave

/s/ Marcia Nave
- - -----------------------------
    Marcia Nave



EMCON



By:/s/ R. Michael Momboisse
- - ----------------------------------------------------
       R. Michael Momboisse, Chief Financial Officer



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                                    EXHIBITS


Exhibit A                      Earn-out Payment Schedule
Exhibit B                      Forms of Employment and Non-Competition Agreement
Exhibit C                      Form of Letter Agreement
Exhibit D                      Form of Legal Opinion






                                       74




                                    EXHIBIT A

                            Earn-Out Payment Schedule


         OWT will pay to Sellers,  as soon as  practicable  following the end of
each of the calendar  years 1999,  2000 and 2001,  an amount equal to 50% of the
amount  by which  WI's  pre-tax  income  for such  year  exceeds  the  following
milestone amounts:

                                                      Pretax
           Earning Period                        Income Milestone
           --------------                        ----------------
           Calendar 1999                             $100,000
           Calendar 2000                             $150,000
           Calendar 2001                             $200,000

         Calculation  of WI's pretax  income for purposes of the above  earn-out
will be based on the application of GAAP,  consistently  applied,  including the
use of accrual  accounting.  OWT shall not  allocate  any portion of its general
corporate  overhead to WI for the  purposes of the above  earn-out  calculation,
provided that, to the extent OWT incurs expenses (e.g.,  insurance,  in-house or
outside legal services,  or accounting services) directly for the benefit of WI,
or otherwise provide  administrative  services for the benefit of WI, the actual
cost of such items,  without markup, shall be charged to WI for purposes of such
calculation.




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