EMCON
8-K, 1996-03-15
ENGINEERING SERVICES
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT


                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934

                                February 29, 1996
                               ------------------

                (Date of Report; Date of Earliest Event Reported)


                                      EMCON
                                    ---------
             (Exact name of registrant as specified in its charter)


                                   California
                                   ----------
                 (State or other jurisdiction of incorporation)


            0-16225                                    94-1738964        
 (Commission File Number)                    (IRS Employer Identification No.)


400 South El Camino Real, San Mateo, California                       94402
- -----------------------------------------------                      ------
  (Address of principal executive offices)                          (Zip Code)


                                 (415) 375-1522
                                        -
              (Registrant's telephone number, including area code)

                               Page 1 of 151 pages
                         Exhibit Index appears on Page 5


                                       1
<PAGE>

                                             

                    INFORMATION TO BE INCLUDED IN THE REPORT


Item 2.  Acquisition or Disposition of Assets.

     EMCON (the  "Company" or "EMCON") has completed a transaction  with Organic
Waste  Technologies,  Inc.  ("OWT"),  the holders of OWT's common and  preferred
stock ("OWT  Stock") and the holders of options to acquire  common  stock of OWT
(the  "OWT  Options";  collectively,  the OWT Stock  and the OWT  Options  being
referred  to  herein  as the  "OWT  Securities"  and the  holders  thereof,  the
"Sellers").  There  were 34  Sellers  in the  Acquisition.  As a  result  of the
transaction  (the  "Acquisition"),  OWT has become a wholly-owned  subsidiary of
EMCON. 

     The  Acquisition,  which was announced on January 30, 1996, was consummated
on February 29, 1996. To complete the  Acquisition,  OWT issued notes to certain
Sellers who are part of OWT's  management,  in an aggregate amount of $1,824,649
(the "OWT Notes"),  in exchange for such Sellers' OWT Securities;  EMCON paid an
aggregate  of  $13,754,351  in cash to the other  Sellers in  exchange  for such
Sellers' OWT  Securities;  and EMCON paid certain fees and expenses  incurred by
OWT and the Sellers with respect to the transaction (the pro rata share of which
was deducted from the consideration  received by each Seller for his, her or its
OWT Securities).  The OWT Notes are convertible into common stock of OWT upon an
underwritten public offering of OWT's common stock in an amount in excess of $10
million.  In the event that the OWT Notes have not been converted into shares of
OWT common stock they may, at the  election of the holder,  instead be converted
into shares of EMCON common stock for a period of ninety days after November 30,
2000 at a conversion  price of $6.50 per share.  The OWT Securities  acquired by
OWT and the OWT Options acquired have been canceled.

     The amount of  consideration  was  determined  based  upon OWT'  projected
earnings  and as a result of a  competitive  bidding  process  and arm's  length
negotiations  between  management  teams of both companies with input from their
respective boards of directors.

     The only  material  relationship  between (a) EMCON,  its  affiliates,  its
directors and officers or any associate of its directors or officers and (b) the
Sellers,  is that John Pacey,  a director of EMCON is a Seller and was, prior to
the  Acquisition,  a director  of OWT.  Mr.  Pacey will remain a director of OWT
after the Acquisition.

     The Acquisition was partially financed through a $10 million term loan from
The Bank of  California,  N.A.,  with the remainder  financed from the Company's
working capital.

     A copy of the press release  announcing the consummation of the Acquisition
is attached as Exhibit 99.1, and is incorporated herein by reference.

                                       2
<PAGE>

Item 7.  Financial Statements and Exhibits.

         (a)      Financial Statements of business acquired:

                  It is  impracticable  to provide the  required  OWT  financial
statements at this time. Such financial  statements will be filed within 60 days
of the date this Form 8-K is filed.

         (b)      Pro forma financial information:

                  It  is   impracticable  to  provide  the  required  pro  forma
financial  information  relative to the Acquisition at this time. Such financial
information will be filed within 60 days of the date this Form 8-K is filed.

         (c)      Exhibits:

         Exhibit No.             Description

         2.1             Stock  Purchase  Agreement  dated  January  30,
                         1996,  among  EMCON,  OWT and the Sellers  (the
                         "Stock Purchase Agreement").

         10.1            Note  Agreement  dated  February 29, 1996 among
                         EMCON, OWT and certain Sellers.

         10.2            Credit   Agreement   dated  February  29,  1996
                         between EMCON and the Bank of California,  N.A.
                         (the "Bank").

         10.3            Security  Agreement  dated February 29, 1996 by
                         EMCON in favor of the Bank.

         10.4            Pledge  Agreement  dated  February  29, 1996 by
                         EMCON in favor of the Bank.

         10.5            Eurodollar Rate Option Agreement dated February
                         29, 1996 between EMCON and the Bank.

         10.6            Fixed Rate  Amortizing  Option  Agreement dated
                         February 29, 1996 between EMCON and the Bank.

         99.1            Press   Release   dated   February   29,   1996
                         announcing the consummation of the Acquisition.




                                       3
<PAGE>



                                   SIGNATURES


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

                                                     EMCON


Date:  March 12, 1996                       By:  /s/ R. Michael Momboisse    
                                                ------------------------------
                                                   R. Michael Momboisse
                                                   Chief Financial Officer and
                                                   Vice President - Legal



                                       4
<PAGE>


                                  EXHIBIT INDEX




                                                          Sequentially Numbered
         Exhibit No.        Description                             Page       
         -----------        ------------------------      ---------------------
             2.1            Stock Purchase Agreement                 6
                            dated January 30, 1996,
                            among EMCON, OWT and the
                            Sellers (the "Stock
                            Purchase Agreement").

            10.1            Note Agreement dated                    77
                            February 29, 1996
                            among EMCON, OWT and
                            certain Sellers.

            10.2            Credit Agreement dated                  89
                            February 29, 1996
                            between EMCON and the
                            Bank of California, N.A.
                            (the "Bank").

            10.3            Security Agreement dated               116
                            February 29, 1996
                            by EMCON in favor of the Bank.
 
            10.4            Pledge Agreement dated                 131
                            February 29, 1996 by EMCON
                            in favor of the Bank.
 
            10.5            Eurodollar Rate Option Agreement      139
                            dated February 29, 1996 between
                            EMCON and the Bank.
 
            10.6            Fixed Rate Amortizing Option          145
                            Agreement dated February 29, 1996
                            between EMCON and the Bank.

            99.1            Press Release dated February 29,      151
                            1996 announcing the consummation
                            of the Acquisition.


                                       5



                                   EXHIBIT 2-1





                            STOCK PURCHASE AGREEMENT

                                      among

                                      EMCON
                            a California corporation
                                   ("Buyer"),

                        ORGANIC WASTE TECHNOLOGIES, INC.
                             a Delaware corporation
                                (the "Company"),

                                       and

                       CERTAIN STOCKHOLDERS OF THE COMPANY
                                   ("Sellers")


                             Dated January 30, 1996




                                       6
<PAGE>


                                TABLE OF CONTENTS

                                                                          Page

1.   Definitions.........................................................  1
     "Advisors"..........................................................  1
     "Agent".............................................................  1
     "Agreement".........................................................  1
     "Audited Financial Statements"......................................  1
     "Best Efforts"......................................................  1
     "Breach"............................................................  2
     "Buyer".............................................................  2
     "Buyer's Indemnified Persons".......................................  2
     "CERCLA"...........................................................   2
     "Closing"...........................................................  2
     "Closing Date"......................................................  2
     "Code"..............................................................  2
     "Common Shares"...................................................... 2
     "Company"............................................................ 2
     "Company Disclosure Schedule"........................................ 2
     "Company Financial Statements"....................................... 2
     "Company Subsidiaries"............................................... 2
     "Consent"............................................................ 2
     "Contemplated Transactions".......................................... 3
     "Damages"............................................................ 3
     "Deposit"............................................................ 3
     "Employee Plans"..................................................... 3
     "Employment Agreement"............................................... 3
     "ERISA".............................................................. 3
     "Escrow Agreement"..................................................  3
     "Escrow Agent"......................................................  3
     "Exchange Act"......................................................  3
     "Expenses"..........................................................  3
     "Facilities"........................................................  3
     "Family" ...........................................................  3
     "GAAP"..............................................................  4
     "Governmental Authorization"........................................  4
     "Governmental Body".................................................  4
     "Hazardous Substances"..............................................  4
     "IRS" ..............................................................  4
     "Knowledge".........................................................  4
     "Knowledge of the Company"..........................................  4
     "Legal Requirement".................................................  5
     "Management Stakeholders"...........................................  5
     "Material Contracts"................................................  5


                                       7
<PAGE>

     "Material Interest".................................................  5
     "Notes".............................................................  5
     "Options"...........................................................  5
     "Order".............................................................  5
     "Ordinary Course of Business".......................................  5
     "Pending Claims"....................................................  5
     "Person"............................................................  5
     "Preferred Shares"..................................................  5
     "Proceeding"........................................................  5
     "Purchase Price"....................................................  5
     "Related Person"....................................................  5
     "Representative"....................................................  6
     "Securities Act"....................................................  6
     "Sellers"...........................................................  6
     "Sellers' Indemnified Persons"......................................  7
     "Selling Stakeholders"..............................................  7
     "Shares"............................................................  7
     "Subsidiaries"......................................................  7
     "Technair"..........................................................  7
     "Technair Agreement"................................................  7
     "Unaudited Financial Statements"....................................  7

2.   Sale, Transfer and Exchange of Shares and Options; Closing...........  7
     2.1      Sale and Exchange...........................................  7
     2.2      Purchase Price..............................................  7
     2.3      Deposit.....................................................  8
     2.4      Closing.....................................................  8
     2.5      Closing Obligations.........................................  8
     2.6      Employment Agreement........................................ 10

3.   Representations and Warranties of the Company........................ 10
     3.1      Corporation Organization.................................... 10
     3.2      Capitalization.............................................. 11
     3.3      Corporate Authority......................................... 11
     3.4      Dissolution; Forfeiture..................................... 12
     3.5      The Company Financial Statements............................ 12
     3.6      Absence of Unaccrued or Undisclosed Liabilities............. 12
     3.7      Absence of Certain Changes.................................. 13
     3.8      Taxes....................................................... 13
     3.9      Title to Properties; Accounts Receivable.................... 14
     3.10     Proprietary Rights.......................................... 15
     3.11     Customer Lists.............................................. 16
     3.12     Benefit Plans and Arrangements.............................. 16
     3.13     Compliance with Laws; Legal Proceedings..................... 17


                                       8
<PAGE>

     3.14     Contracts and Obligations................................... 18
     3.15     Employee Relations.......................................... 19
     3.16     Insurance................................................... 19
     3.17     Environmental Compliance.................................... 19
     3.18     Advances; Related Party Transactions........................ 20
     3.19     Powers of Attorney.......................................... 21
     3.20     No Brokers.................................................. 21
     3.21     Other Agreements to Sell the Company........................ 21
     3.22     Banking Relationships....................................... 21
     3.23     Information Supplied........................................ 21
     3.24     Execution and Performance of Agreement...................... 21

4.   Representations and Warranties of Sellers............................ 22
     4.1      Ownership of Shares and Options............................. 22
     4.2      Execution, Delivery and Enforceability of Agreement;
              No Violation................................................ 22
     4.3      Information Supplied........................................ 23
     4.4      Residence and Domicile...................................... 23
     4.5      Brokers or Finders.......................................... 23

5.   Representations and Warranties of Buyer.............................. 23
     5.1      Organization and Good Standing.............................. 23
     5.2      Execution, Delivery and Enforceability of Agreement;
              No Violation................................................ 23
     5.3      Investment Intent........................................... 24
     5.4      Certain Proceedings......................................... 24
     5.5      Brokers or Finders.......................................... 24
     5.6      Information Supplied........................................ 24
     5.7      No Material Change.......................................... 24

6.   Covenants of the Company and Sellers Prior to Closing Date........... 24
     6.1      Conduct of Business Pending Closing......................... 24
     6.2      Advice of Changes........................................... 26
     6.3      Access and Information...................................... 26
     6.4      Reasonable Efforts.......................................... 27
     6.5      Supplements to Company Disclosure Schedule.................. 27

7.   Covenants of Buyer Prior to Closing Date............................. 27
     7.1      Access to Information....................................... 27
     7.2      Approvals of Governmental Bodies............................ 27
     7.3      Supplements to Schedules.................................... 28
     7.4      Best Efforts................................................ 28
     7.5      Advice of Changes........................................... 28
     7.6      Discussions with Technair................................... 28
8.   Conditions Precedent to Buyer's Obligation to Close.................. 28
     8.1      Accuracy of Representations................................. 28


                                       9
<PAGE>

     8.2      Conversion; Exchange........................................ 29
     8.3      Material Changes............................................ 29
     8.4      Sellers' and the Company's Performance...................... 29
     8.5      Consents.................................................... 29
     8.6      Additional Documents........................................ 29
     8.7      Termination of Stockholders' Agreement...................... 30
     8.8      No Proceedings.............................................. 30
     8.9      Approval of this Agreement by Company Board of Directors.... 30
     8.10     Company Disclosure Schedule................................. 30
     8.11     Execution by Sellers........................................ 30
     8.12     Employment Agreement........................................ 30
     8.13     Resignations of Directors................................... 30
     8.14     Notes....................................................... 30
     8.15     Note Agreement.............................................. 30

9.   Conditions Precedent to Sellers' Obligation to Close................. 30
     9.1      Accuracy of Representations................................. 31
     9.2      Approval of this Agreement by Board of Directors............ 31
     9.3      Buyer's Performance......................................... 31
     9.4      Consents.................................................... 31
     9.5      Note Agreement.............................................. 31
     9.7      No Material Adverse Change.................................. 31
     9.8      Buyer's Disclosure Schedule................................. 31
     9.9      Additional Documents........................................ 31
     9.10     No Proceedings.............................................. 32
     9.11     Execution................................................... 32
     9.12     Employment Agreement........................................ 32

10.  Covenants After the Closing Date..................................... 32
     10.1     Litigation Support.......................................... 32
     10.2     Employment Incentives....................................... 32

11.  Termination.......................................................... 33
     11.1     Automatic Termination Events................................ 33
     11.2     Other Termination Events.................................... 33
     11.3     Effect of Termination....................................... 34

12.  Indemnification; Remedies............................................ 35
     12.1     Survival.................................................... 35
     12.2     Indemnification and Reimbursement by Sellers................ 35
     12.3     Indemnification and Reimbursement by Buyer.................. 36
     12.4     Procedure for Indemnification of Third Party Claims......... 37
     12.5     Benefits.................................................... 38


                                       10
<PAGE>

     12.6     Insurance Proceeds.......................................... 38
     12.7     Procedure for Indemnification - Other Claims................ 38
     12.8     Agents of Indemnifying Sellers for Purposes of
              Indemnification, Contribution Obligation of All Sellers..... 38

13.  General Provisions................................................... 39
     13.1     Expenses.................................................... 39
     13.2     Public Announcements........................................ 39
     13.3     Confidentiality............................................. 39
     13.4     Notices..................................................... 40
     13.5     Binding Arbitration; Service of Process..................... 41
     13.6     Further Assurances.......................................... 42
     13.7     Waiver...................................................... 42
     13.8     Entire Agreement and Modification........................... 42
     13.9     Company Disclosure Schedule................................. 43
     13.10    Assignments, Successors, and No Third Party Rights.......... 43
     13.11    Severability................................................ 43
     13.12    Section Headings, Construction.............................. 43
     13.14    Time of Essence............................................. 44
     13.15    Governing Law............................................... 44
     13.16    Counterparts................................................ 44


Exhibit No.      Document
- ----------       -----------

A                List of Selling Stakeholders

B                List of Management Stakeholders

C                Escrow Agreement

D                Note Agreement, with Loan Note as exhibit thereto

E-1              Note from the Company to Mark H. Shipps

E-2              Note from the Company to Management Stakeholders other than
                     Mark H. Shipps

F                Employment Agreement

G                List of Indemnifying Sellers



                                       11
<PAGE>


                            STOCK PURCHASE AGREEMENT

          This Stock Purchase  Agreement (the "Agreement") is made as of January
30,  1996  among  EMCON,  a  California  corporation  ("Buyer");  ORGANIC  WASTE
TECHNOLOGIES,  INC., a Delaware  corporation  (the  "Company"),  the undersigned
holders of the Company's  Common Shares,  Preferred Shares and/or Options listed
on Exhibit A hereto (the "Selling Stakeholders"), and the undersigned holders of
the  Company's  Common  Shares  and/or  Options  listed on Exhibit B hereto (the
"Management   Stakeholders")  (the  Selling   Stakeholders  and  the  Management
Stakeholders being sometimes collectively referred to herein as the "Sellers").


                                    RECITALS

         A. The Management  Stakeholders  and the Company desire to exchange the
Common Shares and/or Options held by the Management Stakeholders for convertible
notes of the Company in the principal amounts set forth opposite each Management
Stakeholder's named on Exhibit B hereto (the "Notes").

         B. The Selling Stakeholders desire to sell and Buyer desires to buy the
Common  Shares,  the  Preferred  Shares  and/or the Options held by each Selling
Stakeholder  set forth  opposite  each Selling  Stakeholder's  name on Exhibit A
hereto for the consideration and on the terms set forth in this Agreement.

         C.  In  several  instances,  the  same  individual  is  executing  this
Agreement  in two  places,  as both a  Management  Stakeholder  and as a Selling
Stakeholder.  In such events,  the respective  interests of these individuals as
Management Stakeholders and Selling Stakeholders are set forth on Exhibits A and
B, respectively.

                                    AGREEMENT

         The parties, intending to be legally bound, agree as follows:

         1.       Definitions.  For the purposes of this Agreement, the
following terms have the meanings specified or referred to in this Section 1:


         "Advisors" -- Calfee, Halter & Griswold, counsel to the Company and the
Sellers and Raymond James & Associates,  Inc., financial advisors to the Company
and the Sellers.

         "Agent"" -- as defined in Section 12.9.

         "Agreement" -- as defined in the first paragraph hereof.

         "Audited Financial Statements" -- as defined in Section 3.5.

                                       12
<PAGE>

         "Best  Efforts"  -- the  efforts  that a  prudent  Person  desirous  of
achieving a result would use in similar  circumstances to maximize to the extent
reasonably  practicable  the  prospects  that a  result  will  occur;  provided,
however,  that an obligation to use Best Efforts under this  Agreement  does not
require that the Person subject to such  obligation take such actions that would
result in a  material  adverse  change to the  benefits  to such  Person of this
Agreement and the Contemplated Transactions.

          "Breach"  -- a  "Breach"  of  a  representation,  warranty,  covenant,
obligation  or other  provision of this  Agreement or any  instrument  delivered
pursuant to this  Agreement  will be deemed to have  occurred if there is or has
been any material inaccuracy in or breach of, or any material failure to perform
or comply with, such representation,  warranty,  covenant or obligation, and the
term "Breach" means any such inaccuracy, breach or failure.

         "Buyer" -- as defined in the first paragraph hereof.

          "Buyer's  Disclosure  Schedule" -- the disclosure  letter delivered by
the Buyer to the Company prior to the Closing,  as the same may be  supplemented
from time to time, containing the information required by Section 5.

          "Buyer's Indemnified Persons" -- as defined in Section 11.2.

          "CERCLA" -- as defined in Section 3.17.

          "Closing" -- as defined in Section 2.4.

          "Closing  Date" -- the date and time as of which the Closing  actually
takes place.

          "Code"  -- the  Internal  Revenue  Code of 1986,  as  amended,  or any
successor  law,  and  regulations  issued by the IRS  pursuant  to the  Internal
Revenue Code or any successor law.

          "Common  Shares" -- the  issued or  issuable  shares of the  Company's
common stock.

          "Company" -- as defined in the first paragraph hereof.

          "Company  Disclosure  Schedule" -- the disclosure  letter delivered by
the Company to Buyer prior to the Closing,  as the same may be supplemented from
time to time, containing the information required by Section 3.

          "Company Financial Statements" -- as defined in Section 3.5.

          "Company Subsidiaries" -- as defined in Section 3.1.

         "Consent"  -- any  approval,  consent,  ratification,  waiver  or other
authorization (including any Governmental Authorization).

                                       13
<PAGE>

          "Contemplated Transactions" -- all of the transactions contemplated by
this Agreement, including:

          (a) the sale to Buyers of the Shares and  Options  held by the Selling
Stakeholders by Sellers;

          (b)  the  execution,   delivery  and  performance  of  the  Employment
Agreement, the Escrow Agreement, the Note Agreement and the Notes;

          (c) the  performance  by  Buyer,  the  Company  and  Sellers  of their
respective covenants and obligations under this Agreement; and

          (d)  the  exchange  of  Shares  and  Options  held  by the  Management
Stakeholders for the Notes.

         "Damages" --  as defined in Section 12.2.

         "Date of the  Deposit"  -- the date on which the Buyer pays the Deposit
to the Escrow Agent.

         "Deposit" -- as defined in Section 2.3.

          "Employee Plans" -- as defined in Section 3.12.

         "Employment Agreement"  --  as defined in Section 2.5.

          "ERISA" -- the Employee  Retirement Income Security Act of 1974 or any
successor  law, and  regulations  and rules  issued  pursuant to that Act or any
successor law.

          "Escrow Agreement" -- as defined in Section 2.3.

          "Escrow Agent" -- as defined in Section 2.3.

          "Exchange Act"-- the Securities  Exchange Act of 1934 or any successor
law, and the  regulations or rules issued  pursuant to such Act or any successor
law.

          "Expenses" -- the aggregate  amount of all fees and expenses  incurred
in connection with the retention of Raymond James & Associates, Inc. and Calfee,
Halter & Griswold  with respect to the  Contemplated  Transactions.  Such amount
shall equal the full amount of such fees and expenses  less the amount agreed to
be paid by the Company pursuant to Section 13.1.

         "Facilities"  --  as defined in Section 3.9.

                                       14
<PAGE>

         "Family"  --  as defined in the definition of "Related Person."

         "GAAP" --  generally  accepted  United  States  accounting  principles,
applied on a basis  consistent with the basis on which the financial  statements
referred to in Section 3.5 were prepared.

          "Governmental   Authorization"  --  any  approval,  consent,  license,
permit, waiver or other authorization issued,  granted,  given or otherwise made
available by or under the authority of any Governmental  Body or pursuant to any
Legal Requirement.

         "Governmental Body"  --  any

          (a) nation,  state,  county,  city, town,  village,  district or other
governmental jurisdiction of any nature;

          (b) federal, state, local, municipal, foreign or other government;

          (c)  governmental  or  quasi-governmental   authority  of  any  nature
(including any governmental agency, branch,  department,  official or entity and
any court or other tribunal);

          (d) multi-national organization or body; or

          (e) body  exercising,  or entitled to  exercise,  any  administrative,
executive,  judicial,  legislative,  police,  regulatory or taxing  authority or
power of any nature.

          "Hazardous Substances" -- as defined in Section 3.17.

          "Indemnifying Sellers" -- as defined in Section 12.2(a).

          "IRS" -- the United States  Internal  Revenue Service or any successor
agency,  and,  to the extent  relevant,  the  United  States  Department  of the
Treasury.

          "Knowledge"  -- a  Person  will be  deemed  to have  "Knowledge"  of a
particular fact or other matter if:

          (a) such individual is actually aware of such fact or other matter; or

          (b) a prudent  individual  could be expected to discover or  otherwise
become  aware of such fact in  carrying  out such  individual's  duties  for the
Company.

          "Knowledge  of the  Company""Knowledge  of the  Company" -- shall mean
Knowledge  of any officer or  director  of the Company  about the affairs of the
Company;  provided,  however, that a director's Knowledge shall not be construed
to require a director to make any special investigation of facts and shall be


                                       15
<PAGE>

limited to such  knowledge  as a  director  may gain from  receiving  normal and
customary reports from executive officers.

          "Legal Requirement" -- any federal, state, local, municipal,  foreign,
international, multinational or other constitution, law, ordinance, principle of
common law, regulation, statute or treaty.

          "Management Stakeholders" -- as defined in the first paragraph hereof.

          "Material Contracts" -- as defined in Section 3.14.

          "Material  Interest"  -- as  defined  in the  definition  of  "Related
Person."

         "Note Agreement" -- as defined in Section 2.5.

          "Notes" -- as defined in Section 2.3.

          "Options"  -- the issued and  outstanding  options to purchase  Common
Shares of the Company.

          "Order"  --  any  award,  decision,   injunction,   judgment,   order,
directive, ruling, decree, subpoena or verdict entered, issued, made or rendered
by any  court,  administrative  agency,  or  other  Governmental  Body or by any
arbitrator.

          "Ordinary  Course of  Business" -- an action taken by a Person will be
deemed to have been  taken in the  "Ordinary  Course of  Business"  only if such
action is consistent  with the past practices of such Person and is taken in the
ordinary course of the normal day-to-day operations of such Person.

          "Pending Claims" -- as defined in Section 2.5.

          "Person" -- any  individual,  corporation  (including  any  non-profit
corporation),  general or limited partnership,  limited liability company, joint
venture,   estate,   trust,   association,   organization  or  other  entity  or
Governmental Body.

          "Preferred  Shares" -- the issued or issuable  shares of the Company's
Preferred  Stock  including  but not limited to the shares of Series A, Series B
and Series C Preferred Stock referenced in Section 3.2 below.

          "Proceeding"   --   any   action,    arbitration,    audit,   hearing,
investigation,  litigation or suit  (whether  civil,  criminal,  administrative,
investigative or informal) commenced,  brought, conducted or heard by or before,
or otherwise involving, any Governmental Body or arbitrator.

          "Purchase Price" -- as defined in Section 2.2(a).

                                       16
<PAGE>

          "Related Person" -- with respect to a particular individual:

          (a) each other member of such individual's Family;

          (b) any Person that is directly or indirectly controlled by any one or
more members of such individual's Family;

          (c) any  Person in which  members  of such  individual's  Family  hold
(individually or in the aggregate) a Material Interest; and

          (d) any  Person  with  respect  to which one or more  members  of such
Individual's Family serves as a director,  officer, partner, executor or trustee
(or in a similar capacity).

With respect to a specified Person other than an individual:

          (a) any Person that  directly or indirectly  controls,  is directly or
indirectly controlled by, or is directly or indirectly under common control with
such specified Person;

          (b) any  Person  that  holds a  Material  Interest  in such  specified
Person;

          (c) each Person that serves as a director, officer, partner, executor,
or trustee of such specified Person (or in a similar capacity);

          (d) any  Person  in  which  such  specified  Person  holds a  Material
Interest; and

          (e) any Person with respect to which such specified Person serves as a
general partner or a trustee (or in a similar capacity).

For purposes of this definition,  (a) the "Family" of an individual includes (i)
the individual, (ii) the individual's spouse, (iii) any other natural person who
is related to the individual or the individual's  spouse within the first degree
and (iv) any other  natural  person who resides  with such  individual,  and (b)
"Material Interest" means direct or indirect beneficial ownership (as defined in
Rule 13d-3 under the  Securities  Exchange Act of 1934) of voting  securities or
other  voting  interests   representing  at  least  ten  percent  (10%)  of  the
outstanding  voting  power of a Person  or  equity  securities  or other  equity
interests  representing  at least ten percent  (10%) of the  outstanding  equity
securities or equity interests in a Person.

          "Representative" -- with respect to a particular Person, any director,
officer,  employee, agent, consultant,  advisor, or other representative of such
Person, including legal counsel, accountants, and financial advisors.

          "Securities  Act" -- the  Securities Act of 1933 or any successor law,
and regulations and rules issued pursuant to that Act or any successor law.



                                       17
<PAGE>

          "Sellers" -- as defined in the first paragraph hereof.

          "Sellers' Indemnified Persons" -- as defined in Section 12.3.

          "Selling Stakeholders" -- as defined in the first paragraph hereof.

          "Shares" -- collectively, the Common Shares and Preferred Shares.

          "Subsidiaries"  -- with  respect  to any  Person  (the  "Owner"),  any
corporations or other Persons of which  securities or other interests having the
power to elect a  majority  of that  corporation's  or other  Person's  board of
directors or similar governing body, or otherwise having the power to direct the
business and policies of that corporation or other Person (other than securities
or other  interests  having such power only upon the  happening of a contingency
that has not occurred) are held by the Owner or one or more of its Subsidiaries;
when  used  without  reference  to a  particular  Person,  "Subsidiary"  means a
Subsidiary of the Company.

         "Technair" -- as defined in Section 3.24.

         "Technair Agreement" -- as defined in Section 3.24.

         "Unaudited Financial Statements" -- as defined in Section 3.5.

          2. Sale, Transfer and Exchange of Shares and Options;  Closing

          2.1 Sale and Exchange.

          (a) The  Selling  Stakeholders  shall sell and  transfer  to Buyer and
Buyer shall  purchase from the Selling  Stakeholders,  the Shares and/or Options
held by such Selling  Stakeholders and set forth opposite their names on Exhibit
A hereto for the consideration set forth on such Exhibit.

          (b) The  Management  Stakeholders  and the Company shall  exchange the
Shares and Options held by the  Management  Stakeholders  and set forth opposite
their names on Exhibit B hereto for Notes issued by the Company in the principal
amounts set forth  opposite  the names of the  Management  Stakeholders  on such
Exhibit.



                                       18
<PAGE>

          2.2 Purchase Price.

          (a) The amount to be paid to the Selling  Stakeholders  for the Shares
and the Options to be purchased from the Selling  Stakeholders  shall be, in the
aggregate,  $13,757,072.67 (the "Purchase Price") ($13,544,143.11 of which shall
be for the Shares  purchased from the Selling  Stakeholders  and  $212,929.55 of
which shall be for the Options  purchased from the Selling  Stakeholders),  less
the pro rata share of the Expenses to be paid by such Selling Stakeholders.

          (b) The  aggregate  principal  amount of the Notes to be issued in the
exchange of the Shares and Options held by the Management  Stakeholders shall be
$1,817,927.33  ($287,285.06  of  which  shall  be for  the  Shares  held  by the
Management Stakeholders and $1,530,642.27 of which shall be for the Options held
by the Management  Stakeholders),  less the pro rata share of the Expenses to be
paid by such Management Stakeholders.

          (c) In  consideration  for the Company's  efforts and cooperation with
respect to the Contemplated Transactions, the Buyer shall pay to the Company the
sum of One Hundred Seventy-Five  Thousand Dollars ($175,000),  which the Company
shall  use to  purchase  the  minority  interests  in  certain  of  the  Company
Subsidiaries.

          2.3 Deposit2.  On or prior to February 12, 1996, the Buyer may, in its
sole  discretion,  pay a portion  of the  Purchase  Price,  in the amount of Two
Million Dollars  ($2,000,000)  (the "Deposit"),  by depositing the same with the
Bank of  California,  N.A. as escrow agent (the "Escrow  Agent")  pursuant to an
escrow  agreement  substantially  in the form attached  hereto as Exhibit C (the
"Escrow Agreement") .

          2.4  Closing.  The closing of the  purchase,  sale and  exchange  (the
"Closing") provided for in this Agreement will take place at the offices of Gray
Cary Ware & Freidenrich,  400 Hamilton Avenue, Palo Alto,  California,  at 10:00
a.m.  local  time on March 8,  1996,  or upon  such date as may be  approved  in
writing by the Buyer and the Company.

          2.5 Closing Obligations. At the Closing:

          (a) The Company or the Selling Stakeholders,  as the case may be, will
deliver to Buyer:

          (i)   certificates   representing  the  Shares  held  by  the  Selling
Stakeholders,  duly endorsed (or accompanied by duly executed stock powers), for
transfer to Buyer;

          (ii) the Options held by the Selling  Stakeholders,  accompanied by an
assignment thereof to Buyer;

                                       19
<PAGE>

          (iii) a  certificate  executed  by the Company and each of the Selling
Stakeholders   representing   and   warranting   to  Buyer   that  each  of  the
representations  and warranties by him, her or it in this Agreement was accurate
in all  material  respects  as of the Date of the Deposit and is accurate in all
material  respects as of the Closing Date as if made on the Closing Date (giving
full effect to any  supplements  to the Company  Disclosure  Schedule  that were
delivered by the Company to Buyer prior to the Closing Date in  accordance  with
Section 6.5); and

          (iv) such other  documents as are required to be provided  pursuant to
Section 8; and

          (b) Buyer will deliver:

          (i) to each Selling Stakeholder, the amount, as set forth in Exhibit A
to be paid  to such  Selling  Stakeholder  at the  Closing,  less  such  Selling
Stakeholder's pro rata share of the Expenses. Such amounts shall be paid by bank
cashier's  check if the amount to be paid to such  Selling  Stakeholder  is less
than Five Hundred Thousand  Dollars  ($500,000) and by wire transfer to accounts
specified  by the Selling  Stakeholder  if the amount to be paid to such Selling
Stakeholder is greater than Five Hundred Thousand Dollars ($500,000);

          (ii) to the  Company,  the  amount  set forth in  Section  2.2(c),  by
cashier's check;

          (iii) to Sellers,  a certificate  executed by Buyer  representing  and
warranting to Buyer that each of Buyer's  representations and warranties in this
Agreement was accurate in all material respects as of the date of this Agreement
and is accurate in all  material  respects as of the Closing  Date as if made on
the Closing Date (giving full effect to any  supplements  to any schedules  that
were delivered, pursuant to this Agreement, by the Buyer to the Company prior to
the Closing Date in accordance with Section 7.3);

          (iv) to Sellers,  such other  documents as are required to be provided
pursuant to Section 9;

          (v) to the Advisors, the amounts set forth in invoices to be delivered
to Buyer not less than three (3) days prior to Closing; and

          (vi) to each Management  Stakeholder,  a Note  Agreement,  in the form
attached  hereto as Exhibit D (the "Note  Agreement")  and a Note  issued by the
Company and executed by the Buyer as a guarantor, in the form attached hereto as
Exhibit E-1 with  respect to Mark H.  Shipps and as Exhibit E-2 with  respect to
the other Management Stakeholders

          (c) the Company will deliver to each Management Stakeholder, a note in
exchange for the Options and/or Common Shares held by him or her (the "Note") in
the form  attached  hereto as Exhibit E-1 with  respect to Mark H. Shipps and as
Exhibit E-2 with respect to the other Management Stakeholders,  in the principal
amount set forth opposite his or her name on Exhibit B hereto less such


                                       20
<PAGE>

Management Stakeholder's pro rata share of the Expenses;

          (d) the Management Stakeholders shall deliver to the Company:

          (i)  certificates  representing  the  Shares  held  by the  Management
Stakeholders,  duly endorsed (or  accompanied by duly executed stock powers) for
transfer to the Company;

          (ii) the Options held by the Management  Stakeholders,  accompanied by
an assignment thereof, to the Company;

          (iii)  a   certificate   executed  by  the   Management   Stakeholders
representing and warranting to the Company that each of the  representations and
warranties  made by him or her in this  Agreement  was  accurate in all material
respects as of the Date of the Deposit and is accurate in all material  respects
as of the Closing Date as if made on the Closing Date (giving full effect to any
supplements  to the  Company  Disclosure  Schedule  that were  delivered  by the
Company to the Buyer prior to the Closing Date in accordance  with Section 6.5);
and

          (iv) such other  documents as are required to be provided  pursuant to
Section 8.

          2.6 Employment Agreement.  Concurrently herewith, Mark H. Shipps shall
execute  and deliver an  employment  agreement  with Buyer in the form  attached
hereto as Exhibit F (the "Employment Agreement").

          3.   Representations  and  Warranties  of  the  Company.  The  Company
represents and warrants, as of the Date of the Deposit, to Buyer that, except as
set forth on the Company Disclosure Schedule:

          3.1  Corporation Organization.

          (a) The Company is a corporation, duly incorporated,  validly existing
and in good  standing  under the laws of the State of Delaware.  The Company has
all requisite  corporate  power to own,  operate and lease its properties and to
conduct its business as now being  conducted.  The Company is duly  qualified or
licensed to do business,  and is in good standing as a foreign  corporation,  in
each state or other  jurisdiction in which it owns or leases properties or where
the  nature  of its  business  or  operations  requires  such  qualification  or
licensing,  unless the failure to do so would not have a material adverse effect
on the Company's assets,  business,  operations or financial  condition.  To the
knowledge   of  the   Company,   the  Company  has   obtained   all   approvals,
authorizations,  consents, licenses, clearances and orders of, and has currently
effective all  registrations  with, all governmental and regulatory  authorities
that are  necessary  to the conduct of its business or  operations  as now being
conducted,  except where the failure to do so would not have a material  adverse
effect on the Company.



                                       21
<PAGE>

          (b) The only  Subsidiaries of the Company are: Omni Gen  Technologies,
Inc.,  an Ohio  corporation  ("Omni  Gen");  Keystone  Recovery,  Inc.,  an Ohio
corporation  ("Keystone");  LFG Specialties,  Inc., an Ohio corporation ("LFG");
O.W.T.  Construction Company, an Ohio corporation ("OWT"); and American Landfill
Supply Co., an Iowa corporation ("ALS") (collectively,  Omni Gen, Keystone, LFG,
OWT and ALS, the "Company Subsidiaries").  (Except where otherwise indicated or,
given the context  otherwise  appropriate,  references  herein to the  "Company"
shall also  include the Company  Subsidiaries.)  Except for a five  percent (5%)
minority interest in Keystone,  as of the Closing Date, the Company will own all
of the issued and outstanding capital stock of each of the Company Subsidiaries.
Each of the Company  Subsidiaries is duly incorporated,  validly existing and in
good  standing  in  the  state  of  its  incorporation.   Each  of  the  Company
Subsidiaries  has all requisite  corporate  power to own,  operate and lease its
properties  and to conduct  its  business  as now being  conducted.  Each of the
Company  Subsidiaries  is duly  qualified or licensed to do business,  and is in
good standing as a foreign  corporation in each state or other  jurisdiction  in
which it owns or leases  properties  or where  the  nature  of its  business  or
operations requires such qualification or licensing, unless the failure to do so
would not have a material adverse effect on its assets, business,  operations or
financial  condition.  To the  knowledge  of the  Company,  each of the  Company
Subsidiaries  has obtained all approvals,  authorizations,  consents,  licenses,
clearances and orders of, and has currently  effective all  registrations  with,
all governmental and regulatory  authorities  which are necessary to the conduct
of its business or operations as now being  conducted,  except where the failure
to do so would not have a material adverse effect on the Company.

          3.2 Capitalization3.2Capitalization.

          (a) The  authorized  capital stock of the Company  consists  solely of
7,500,000  shares of common  stock,  $0.01 par value,  and  2,841,481  shares of
preferred  stock,  $0.01 par value,  1,360,000 of which are designated  Series A
Preferred  Stock,  740,740 of which are designated  Series B Preferred Stock and
740,741 of which are designated  Series C Preferred  Stock.  There are currently
issued and  outstanding  712,000  shares of common  stock,  1,360,000  shares of
Series A Preferred Stock, 740,740 shares of Series B Preferred Stock and 740,741
shares of Series C Preferred Stock. The Company Disclosure Schedule sets forth a
true and complete  description of the authorized,  issued and outstanding shares
of the capital stock of the Company and each of the Company Subsidiaries showing
all  stockholders of the Company and each of the Company  Subsidiaries as of the
date of this Agreement.  All of the issued and outstanding shares of the Company
and the Company Subsidiaries are duly authorized, validly issued, fully paid and
nonassessable  except where  failure to be so would not have a material  adverse
effect on the business,  financial position or operating results of the Company.
All such shares have been issued in accordance with federal and applicable state
securities  laws concerning the issuance of securities.  The Company  Disclosure
Schedule  accurately  lists all holders of the Company's  capital stock and each
such person's actual ownership interest. The rights,  preferences and privileges
of the Company's  capital stock are as stated in the  Company's  Certificate  of
Incorporation, as heretofore amended.

                                       22
<PAGE>

          (b) Except for the Options and as  otherwise  set forth in the Company
Disclosure Schedule, no options,  warrants,  conversion  privileges,  preemptive
rights,  rights to first  refusal or other  rights,  agreements  or  commitments
(written or otherwise  by the Company or to the  knowledge of the Company by any
Seller are  currently  outstanding  to purchase or otherwise  receive any of the
capital stock of the Company or the Company Subsidiaries.

          (c) The Company  has  delivered  to the Buyer  complete  and  accurate
copies of the Certificates of Incorporation and Bylaws (including all amendments
thereto)  of the Company  and each of the  Company  Subsidiaries.  Not less than
twenty (20) days before the Closing Date the Company will make  available to the
Buyer the minute  books of the Company and the Company  Subsidiaries  containing
minutes  for all  meetings  of, and written  consents  issued by the Company and
executed by, each such  corporation's  stockholders,  Board of Directors and all
committees of such Board since the date of organization of such corporation.

          3.3  Corporate  Authority.  The  Company has all  requisite  corporate
authority  and  power to  execute  and  deliver  this  Agreement  and the  other
agreements  referenced herein and to perform all of its obligations with respect
to the  Contemplated  Transactions.  The execution,  delivery and performance of
this Agreement and the other agreements  referenced  herein and the consummation
of the transactions  contemplated  hereby and thereby have been duly authorized,
or prior to the  Closing  will be duly  authorized,  by the  Company's  Board of
Directors and, if required, by its stockholders.

          3.4 Dissolution;  Forfeiture. No action at law or in equity and to the
Knowledge  of the Company no  investigation  or  proceeding,  whatsoever  is now
pending or threatened to: (a) liquidate,  dissolve or disincorporate the Company
or any of the Company  Subsidiaries,  (b) declare any of the  corporate  rights,
powers or  privileges of the Company or any of the Company  Subsidiaries,  to be
null and void or otherwise  than in full force and effect,  (c) declare that the
Company  or any of the  Company  Subsidiaries,  or their  respective  Boards  of
Directors or any of their respective officers,  agents or employees has exceeded
or violated any of their respective corporate rights,  powers or privileges,  or
(d) obtain any  decree,  order,  judgment  or other  judicial  determination  or
administrative or other ruling that would or might impede or detract from any of
the  corporate  rights,  powers or  privileges  now  vested in or claimed by the
Company or any of the Company Subsidiaries.

          3.5 The  Company  Financial  Statements.  The  consolidated  financial
statements  of the Company  for the fiscal  years  ended  December  31, 1993 and
December 31, 1994 have been  prepared and audited in  accordance  with GAAP (the
"Audited Financial Statements") and the consolidated financial statements of the
Company for year ended December 31, 1995 (the "Unaudited Financial  Statements")
(collectively,  the Audited  Financial  Statements  and the Unaudited  Financial
Statements being referred to as the "Company  Financial  Statements")  have been
prepared in accordance  with GAAP and fairly  present the financial  position of
the Company in accordance with GAAP as at the dates thereof; provided,  however,
that the Unaudited Financial  Statements do not contain the footnote disclosures
required by GAAP.

                                       23
<PAGE>

          3.6  Absence  of  Unaccrued  or  Undisclosed  Liabilities.  Except for
claims, liabilities or obligations:

          (a) which were properly  reflected or adequately  reserved  against in
the balance sheet included as part of the Unaudited Financial Statements;

          (b) which were  incurred  in the  Ordinary  Course of  Business  since
December 31, 1995;

          (c) which are listed on the Company Disclosure Schedule;

          (d) which are less than $25,000 in any single case; or

          (e) which  result from any failure to properly  account for any of the
Company's  estimated  project  costs and/or  project  revenue  recognized in the
Audited Financial  Statements or Unaudited Financial Statements and which, taken
in the aggregate with all other accrued project and related costs and/or revenue
recognized  as of December  31,  1995,  do not result in a net  reduction in the
aggregate  profit  recognized  by the  Company  on all  projects  subsequent  to
December 31, 1995,  the Company does not have any material  liabilities  whether
absolute, accrued,  unaccrued,  contingent or otherwise whether due or to become
due.

          Except as set forth in paragraphs (a) through (e) of this Section 3.6,
the Company does not have Knowledge of and has no reasonable  grounds to know of
any  basis  for any  assertion  against  the  Company  of any  material  claims,
liabilities or  obligations of any nature  required by GAAP to be reflected in a
corporate  balance sheet which have not been fully reflected or reserved against
in the  December  31,  1995  balance  sheet  included  as part of the  Unaudited
Financial  Statements,  provided,  however, that no limitation set forth in this
Section  3.6  shall in any way  affect  any  other  representation  or  warranty
contained in this Agreement.

          3.7 Absence of Certain Changes.  Since December 31, 1995 there has not
been any: (a) material  adverse change in the business,  financial  condition or
operations  of the Company and the Company  Subsidiaries  taken as a whole,  (b)
recapitalization, amendment to the Certificate of Incorporation or Bylaws or any
change in, authorization,  creation,  issuance or agreement for issuance of, the
capital stock or any securities convertible into, or options,  warrants or other
rights to subscribe to any shares of capital stock of the Company or the Company
Subsidiaries,  or any  declaration  setting  aside or payment of any dividend or
distribution  (whether in cash,  securities or property)  with respect  thereto,
except as  contemplated  hereby,  (c)  increase in the  compensation,  direct or
indirect,  payable to any of the  officers  or  employees  of the Company or the
Company Subsidiaries, including adoption of or increase in any bonus, insurance,
pension or other employee  benefit plan,  payment or  arrangement,  or any other
agreement or arrangement with its officers, employees or stockholders, except as


                                       24
<PAGE>

contemplated  hereby,  (d) unwaived default in respect of any Material Contracts
(as defined in Section  3.14),  except for such  defaults,  if any, which do not
have a material adverse effect on the financial position,  business or operating
results of the  Company,  (e)  material  change in the  methods  and  procedures
employed  in  keeping  the books  and  records  of the  Company  or the  Company
Subsidiaries or (f) strike or material labor dispute.

          3.8 Taxes.  All tax returns of the Company required by law (including,
without   limitation,   all   income,   unemployment   compensation,    worker's
compensation,  Social Security,  excise, privilege and franchise tax laws of the
United States or any state or municipal subdivision thereof) to be filed through
the Closing Date (true and complete  copies of which have been made available to
the  Buyer)  have  been or  will  be  duly  and  timely  filed,  and all  taxes,
assessments,  contributions,  fees and governmental charges or impositions shown
on said returns or reports  (other than those not yet due and payable or payable
without penalty or interest) have been paid, except where any failure to so file
or pay would,  individually or in the aggregate,  have a material adverse effect
on the Company and the Company  subsidiaries,  taken as a whole. The Company has
not received any notice of assessment of any federal,  state, municipal or other
tax upon or measured by its income and, to the Company's knowledge,  there is no
basis for an additional  assessment of any such tax,  except for those for which
the Company has  established  adequate  reserves.  The Company has not knowingly
waived any law or  regulation  fixing,  or  consented to the  extension  of, any
period of time for the assessment of any tax or other  governmental  imposition,
or become  committed  so to do.  There are no audits of the Company  pending and
there are no matters under discussion with any federal,  state, local or foreign
authorities with regard to the payment of any taxes by the Company. There are no
issues that have been raised by the IRS or other taxing  authority in connection
with an  examination or otherwise  which by  application  of similar  principles
could  reasonably be expected to result in a proposed  deficiency for any period
not examined.

                                       25
<PAGE>

          3.9 Title to Properties;  Accounts  Receivable.

          (a) Except for property and assets that the Company has disposed of in
the Ordinary  Course of Business,  the Company has, and will have at the Closing
Date,  good  and  marketable  title  to  all  properties  and  assets  shown  or
represented  on the balance sheet  included as part of the  Unaudited  Financial
Statements or acquired since December 31, 1995, free and clear of all mortgages,
pledges,  liens,  defects  in  title,  conditional  sale  agreements  and  other
encumbrances,  except for liens, encumbrances and defects in title in respect of
property or assets of the Company  which:  (i) are  incidental to the conduct of
the Company's  business;  (ii) have arisen in the Company's  Ordinary  Course of
Business;  (iii) were not incurred in connection  with the borrowing of money or
the obtaining of advances or credit (other than credit  arrangements  related to
purchase money liens); and (iv) do not in the aggregate  materially detract from
the  property  and assets of the  Company.  The  Company has  performed  all the
obligations  required to be performed by it with respect to all assets leased by
it through the date hereof, except where the failure to perform would not have a
material  adverse effect on the business or financial  condition of the Company.
The Company enjoys  peaceful and  undisturbed  possession of all of its offices,
warehouses,  buildings  and all other  real  property  and  related  facilities,
whether owned,  leased or operated  (collectively,  the "Facilities"),  and such
Facilities  are not subject to any claims,  liens,  pledges,  options,  charges,
easements, security interests,  rights-of-way,  encumbrances or other rights, or
any  encroachments,  building or use restrictions,  exceptions,  reservations or
limitations  which in any material respect  interfere with or impair the present
and continued use thereof in the usual and normal conduct of its business. There
are no pending or  threatened  condemnation  proceedings  relating to any of the
Facilities.  The  Facilities  and  the  real  property  improvements  (including
leasehold  improvements),  equipment and other tangible  assets owned or used by
the Company at the Facilities are insured in amounts  believed by the Company to
be adequate and, to the Knowledge of the Company, are structurally sound with no
material  defects.  Said  items  are not  subject  to any  commitment  or  other
arrangement  for their sale by the  Company or use by third  parties  other than
commitments or arrangements entered into in the Ordinary Course of Business. The
assets are valued at or below the lower of fair market value or actual cost less
an adequate and proper  depreciation  charge. For tax purposes,  the Company has
not depreciated any of the assets in any manner inconsistent with applicable IRS
guidelines, if any.

          (b) All tangible property,  real and personal,  owned or leased by the
Company is in good operating condition and repair,  except for ordinary wear and
tear and any defects the cost of repairing  which,  singly or in the  aggregate,
would not be material or are accrued for on the Company Financial Statements. To
the knowledge of the Company, such property is in conformity with all applicable
laws, ordinances,  orders, regulations,  rules and other requirements (including
applicable   zoning,   environmental,   motor   vehicle   safety  or  standards,
occupational  safety and health laws and  regulations)  currently  in effect and
relating thereto,  except where the failure to conform would not have a material
adverse  effect  on the  business,  operations  or  financial  condition  of the
Company.

          (c) All  accounts  receivable  of the  Company  shown  on the  Company
Financial  Statements are valid,  genuine and subsisting,  arose in the Ordinary
Course of Business, and the aggregate amount thereof less the reserve for


                                       26
<PAGE>

doubtful  accounts  with  respect  thereto  set forth in the  Company  Financial
Statements, are, to the best knowledge of the Company after due inquiry, current
and collectible within customary payment terms.

          3.10 Proprietary Rights.

          (a) The Company owns the rights to use all trademarks,  trade secrets,
trade names, copyrights,  processes,  designs, formulas,  know-how,  inventions,
licenses and  intellectual  property rights used in connection with its business
and the same are  believed  by the  Company to be  sufficient  to  conduct  such
business as it is now or heretofore has been conducted with no known or asserted
conflict with or  infringement  of the asserted or actual rights of others.  The
Company has no Knowledge of any  infringement  by any third party in  connection
with any of the  foregoing  and the Company has not taken or omitted to take any
action which would have the effect of waiving any of its rights  thereunder,  in
each case except  where such  infringement  or waiver  would not have a material
adverse effect on the business, prospects, condition (financial or otherwise) or
results of operations of the Company.  To the Knowledge of the Company, no third
party  has  filed or been  issued  or  granted  any  applications  for  patents,
trademarks,  trade names or  registered  copyrights  relating  to the  Company's
assets.

          (b)  The  Company  Disclosure  Schedule  lists  all  patents,   patent
applications,  trademarks,  trade names and registered  copyrights  owned by the
Company.  Except as set forth in the Company Disclosure Schedule, the Company is
not required to pay any royalty,  license fee or similar type of compensation in
connection  with the conduct of its business as it is now or heretofore has been
conducted.

          (c) The Company has  obtained  written  agreements  from all  required
parties and entities  assigning to the Company any material  proprietary  rights
relating to the Company's  assets.  Such  agreements are currently  valid and in
full  force  and  effect  and  except  as set  forth in the  Company  Disclosure
Schedule,  do not  contain any  provisions  or  restrictions  with regard to the
rights  granted to the Buyer  under this  Agreement.  Except as set forth on the
Company  Disclosure  Schedule,  each of the  Company's  employees  and any other
Person  who,  either  alone or in  concert  with  others,  developed,  invented,
discovered,  derived,  programmed, or designed any trade secrets of the Company,
or who have knowledge of or access to information  related to them, have entered
into  appropriate  confidentiality  agreements,  copies of which will,  at least
twenty (20) days prior to the Closing Date, have been provided to the Buyer. All
material trade secrets of the Company are currently protectable and are not part
of the public  knowledge or literature,  nor have they been used,  divulged,  or
appropriated for the benefit of any past or present  employees or other persons,
or to the detriment of, the Company.

          3.11  Customer  Lists.  The Company has provided the Buyer access to a
complete and accurate list of each of the material customers of the Company. The
relationships between the Company and its active customers and suppliers are, in
the  aggregate,  in good  standing,  and since  December 31,  1994,  no material
customer or supplier has canceled or terminated, or, to the Knowledge of the


                                       27
<PAGE>

          Company,  threatened to cancel,  terminate or change its  relationship
with the Company in any manner adverse to the Company.

          3.12 Benefit Plans and Arrangements.

          (a)  Except as set forth in the  Company  Disclosure  Schedule,  or as
otherwise  contemplated by this Agreement,  the consummation of the Contemplated
Transactions  will not  result  in any  payment  (whether  of  severance  pay or
otherwise)  becoming due from the Company to any  employee,  consultant or other
third party.

          (b) The Company  Disclosure  Schedule  lists all pension,  retirement,
stock  purchase,  stock  option,  stock bonus,  savings or profit  sharing plan,
individual  employment  agreement,  bonus or  incentive  compensation  programs,
deferred compensation  agreements,  severance pay plans,  consultant,  bonus, or
group insurance contracts, or any other material incentive,  welfare or employee
benefit  plan,  or  similar  arrangement,  understanding  or course of  dealing,
including  all employee  benefit  plans and employee  pension  benefit  plans as
defined in Section 3(3) of ERISA (the "Employee Plans").

          (c) With respect to the Employee  Plans,  the Company  will,  at least
twenty (20) days prior to the Closing Date,  have delivered or made available to
the Buyer copies of any: (1) plans and related trust  documents  and  amendments
thereto;  (ii) the most recent  summary  plan  descriptions  and the most recent
annual report; (iii) annual reports on Form 5500 which were filed in each of the
most recent three (3) plan years, including,  without limitation,  all schedules
thereto and all  financial  statements  with  attached  opinions of  independent
accountants;  (iv) Form PBGC-1  which was filed in each of the most recent three
(3) plan  years;  (v) the most  recent  actuarial  valuation;  and (vi) the most
recent  determination  letter  received from the IRS. Such financial  statements
fairly present the financial  condition of each Employee Plan in accordance with
United States generally accepted  accounting  principles applied on a consistent
basis. All Employee Plans have been administered in substantial  compliance with
their terms, ERISA to the extent applicable, and, where applicable,  Section 401
of the Code.

          (d) No event of the type set  forth in  Section  4043(b)  of ERISA has
occurred and is continuing with respect to Employee Plans except insofar as such
an  event  may  arise  as a  result  of the  consummation  of  the  Contemplated
Transactions  or would not have a material  adverse  effect  upon the  Company's
business,  financial  position or  operating  results.  There exists no material
violation of ERISA with respect to the filing of reports, documents, and notices
regarding the Employee Plan participants or beneficiaries.  No action,  suit, or
proceeding is pending,  nor, to the Knowledge of the Company,  is any threatened
or imminent,  with respect to the assets of any of the trusts under any Employee
Plan. All amendments required to bring an Employee Plan into conformity,  in all
applicable  and material  respects,  with ERISA have been made. Any bonding with
respect to an Employee Plan required under ERISA is in full force and effect. To
the  Knowledge  of the  Company,  the Company has not  incurred  any  liability,
pursuant to Subtitle A of Title IV of ERISA,  to the  Pension  Benefit  Guaranty
Corporation.

                                       28
<PAGE>

          (e) No breach of fiduciary responsibility has occurred with respect to
any of the Employee Plans other than such breach, if any, which would not have a
material  adverse  effect  on the  Company's  business,  financial  position  or
operating  results.  There is no suit,  litigation  or claim (other than routine
benefit claims) pending or, to the Knowledge of the Company,  threatened against
the Company or any fiduciary of any Employee Plan involving any Employee Plan or
against  any such plan or its  assets by any  employee  or former  employee  (or
beneficiary thereof) of the Company which individually or in the aggregate would
adversely affect the financial condition of any such Employee Plan.

          3.13 Compliance with Laws; Legal Proceedings.

          (a) The Company is not in violation of, or in default with respect to,
any term or provision of (i) its Certificate of Incorporation or Bylaws, or (ii)
any judgment, writ, order, injunction, or decree of any court or of any federal,
state,  or municipal  agency or authority  in any case or  proceeding  expressly
naming the Company.

          (b) To the  Knowledge of the Company,  the Company and its  operations
are  in  compliance   with   applicable   statutes,   ordinances,   regulations,
requirements   and  orders  of  the  federal   government  and  of  all  states,
municipalities,  and  agencies  thereof,  and of all  other  authorities  having
jurisdiction  in  respect  of any of its  assets or  operations  (including  any
applicable  foreign government or agency or subdivision  thereof),  except where
the failure to do so would not have a material adverse effect on the Company.

          (c) The Company has not been  threatened  with,  nor is it a party to,
directly or indirectly,  nor, to the Knowledge of the Company,  is there any set
of facts that is likely to give rise to, any material legal action, governmental
investigation,   or  other  proceeding  (governmental  or  private),   including
investigations,  inquiries, citations, complaints, orders or stipulations by any
federal, state or local agency or governmental unit, and there are no judgments,
orders,  restrictions or decrees of a continuing nature outstanding  against the
Company.  The Company has not been threatened with, nor, to the Knowledge of the
Company  is there  any set of facts  that is likely to give rise to, a charge of
any material  violation of any provision of any federal,  state,  local or other
law  (including  common law), or  administrative  regulations  in respect of its
business or property.

          3.14 Contracts and Obligations.  The Company Disclosure  Schedule sets
forth a true and complete list of the following  agreements  and  instruments to
which the  Company  is a party:  (a) all  executory  contracts,  agreements  and
instruments  having  a total  contract  price  in  excess  of  $50,000;  (b) all
contracts,  agreements  or  instruments  which  are in  the  nature  of  teaming
agreements,   joint  venture  agreements,   non-compete  agreements,   franchise
agreements, exclusive license agreements or other similar agreements restricting
access  to any  business  opportunity  of the  Company;  (c)  all  loan  or debt
agreements,  guarantees, indemnities and bonding commitments; (d) all license or
technology transfer agreements;  (e) all leases, subleases and equipment leases,
having a total contract price in excess of $50,000;  (f) all agreements  between
the  Company,  on  the  one  hand,  and  any  of  the  officers,   directors  or
stockholders;  (g) all material agreements between the Company, on the one hand,
and any other  employees  of the  Company on the other  hand;  (h) all  material
licenses or permits issued by any government agency or authority for the benefit
of the Company and/or one or more of the Company Subsidiaries; (i) any


                                       29
<PAGE>

management or consultation  agreement not terminable at will without  liability;
(j) any contracts or agreements  requiring the payment of fees or commissions in
connection with any sale of all or  substantially  all of the Company's stock or
assets or any sale of a substantial  interest in the Company;  and (k) any other
agreement which materially affects the Company's business, financial position or
operating results or which was entered into other than in the Ordinary Course of
Business (collectively,  the "Material Contracts"). The Company has delivered to
the Buyer  true and  complete  copies  of each of the  Material  Contracts.  The
Company is not in  material  violation  of, or in default  with  respect to, any
Material Contract and the Material Contracts are valid, binding and enforceable,
subject only to applicable  bankruptcy,  insolvency  and similar laws  affecting
creditors  rights  generally  and  subject,  as to  enforceability,  to  general
principles of equity. To the Knowledge of the Company, the relationships between
the Company and the other  parties to each of the Material  Contacts are in good
standing,  and no such other  contract  party has  canceled  or  terminated,  or
threatened to cancel,  terminate or change in any manner  adverse to the Company
such relationship or the terms of any Material Contract.

          3.15 Employee Relations.

          (a) The Company has no union or collective bargaining  agreement,  any
contract or other agreement with any labor  organization or with any employee or
consultant  which is not terminable at will by the Company,  without  liability,
and no such  contract or  agreement is under  discussion  by  management  of the
Company with any employee or consultant.  There are no pending or threatened (i)
strikes,  work  stoppages,  slowdowns or picketing  respecting  employees of the
Company,  (ii) unfair labor practice  complaints  against the Company,  or (iii)
statutes, contracts or agreements,  domestic or foreign, which will obligate the
Company to make any severance payments as a consequence of the execution of this
Agreement or the consummation of the Contemplated Transactions.

          (b) The Company has not received notice that there is any key employee
who intends to leave the Company's  employ as a result of, or at the  conclusion
of, the Contemplated Transactions. The Company's relationship with its employees
is good.

          3.16 Insurance3.16  Insurance3.16  Insurance. The properties and risks
of the Company are covered by valid and currently  effective  insurance policies
issued in favor of the  Company,  which  policies  are set forth on the  Company
Disclosure Schedule,  and the Company is included as an insured party under such
policies,  with full  rights as loss  payee.  The  Company  Disclosure  Schedule
contains a list and brief  description of each insurance policy (copies of which
have been  previously  provided  to the Buyer)  maintained  with  respect to the
Company (or such corporation's assets or operations),  which provides continuing
coverage as of the date hereof. The Company Disclosure  Schedule also includes a
list and brief description of individual claims in excess of $10,000 now pending
or made  during  the  36-month  period  immediately  preceding  the date of this
Agreement, by or on behalf of the Company under any insurance policies.

                                       30
<PAGE>

          3.17 Environmental Compliance.

          (a)  The  Company  has  all  material  permits,   licenses  and  other
authorizations  required  under  applicable  laws and  regulations  relating  to
pollution control and protection of the environment  necessary for the operation
of its Facilities.  The Company is not in material violation of any of the terms
or conditions of any such permits, licenses,  leases, or authorizations.  To the
Knowledge  of the  Company,  the  Company  has not  acted  or  failed  to act in
violation of any law or regulation,  order or other  requirement of governmental
authorities  with respect to the  pollution or the  atmosphere,  surface  water,
groundwater  and noise,  the  handling of toxic or hazardous  waste  material or
other  matters  related  to the  environment.  There are no  pending  or, to the
Knowledge  of the  Company,  threatened  civil or criminal  actions,  notices of
violations  or  administrative  proceedings  relating  to  pollution  control or
protection of the environment  that would have a material  adverse effect on the
business or financial condition of the Company.

          (b) To the Knowledge of the Company, there are no material conditions,
circumstances, activities, practices, incidents, actions or plans which would be
reasonably  likely  to  interfere  with  or  prevent   compliance  or  continued
compliance by the Company with any environmental laws currently in force or with
any existing regulation,  code, order, decree, judgment,  injunction,  notice or
demand letter issued, entered,  promulgated or approved thereunder, or which may
give  rise  to any  common  law or  other  legal  liability,  including  without
limitation,   liability   under  the   Comprehensive   Environmental   Response,
Compensation  and Liability Act  ("CERCLA") or similar  state,  foreign or local
laws,  or  otherwise  form  the  basis  of  any  claim,  action,  demand,  suit,
proceeding,  hearing, notice of violation,  study or investigation of or against
the Company, based on or related to the manufacture,  processing,  distribution,
use,  treatment,  storage,  disposal,  transport or handling,  or the  emission,
discharge,  release or threatened release into the workplace or the environment,
of any  pollutant,  contaminant,  chemical,  or  industrial,  toxic or hazardous
material,  substance or waste on any properties owned or leased by, or under the
direct control of, the Company.  Without in any way limiting the  foregoing,  no
release, emission or discharge to the environment of any hazardous substance (as
that term is currently  defined under CERCLA or under any  applicable  analogous
state law  ("Hazardous  Substance"))  has occurred or is currently  occurring in
connection  with any action or failure to act on any properties  owned or leased
by, or under the direct  control of, the Company which has or could give rise to
any liability of the Company.

          3.18 Advances;  Related Party Transactions.

          (a) There are no  receivables  of the Company owing by any  directors,
officers,  employees or  consultants  of the Company or to any  affiliate of any
such  Company  person or  entity,  other  than  advances  by the  Company in the
ordinary course of business to officers and employees for reimbursable  business
expenses.

                                       31
<PAGE>

          (b) No stockholder,  officer, director or employee of the Company, nor
any member of the Family of any such stockholder,  officer, director or employee
owns,  or since  December  31,  1993,  has owned,  directly or  indirectly,  any
interest  exceeding  five percent (5%) in (a) any business,  corporate or other,
which is material party to any material business arrangement with the Company or
(b) any  material  property  or  rights,  tangible  or  intangible,  used in the
business of the Company.  No stockholder,  officer,  or director of the Company,
owns, directly or indirectly,  any interest in, or is an officer or director of,
any  business,  corporate  or other  (other  than as a  stockholder  of a public
company), which competes with the Company.

          3.19 Powers of Attorney.  The Company  Disclosure  Schedule contains a
complete   list  of  all  powers  of  attorney   (or  similar   instruments   or
authorizations)  granted by the Company to any person or entity. All such powers
of  attorney  (or  similar   instruments  or  authorizations)   are  subject  to
termination  or  revocation  by the Company at any time,  without  notice to any
other person or entity and without penalty.

          3.20 No Brokers.  The Company has not entered  into and will not enter
into any  contract,  agreement  or  understanding  with any  Person,  except for
Raymond James & Associates,  Inc. (a copy of which contract has been provided to
Buyer),  which may result in the  obligation  of the Company or the Buyer to pay
any finder's fee, brokerage commission or similar payment in connection with the
Contemplated Transactions

          3.21 Other Agreements to Sell the Company. Except as set forth herein,
the Company has no legal  obligation,  absolute or contingent,  to any person or
firm to  sell  any  capital  stock  of the  Company  or to  effect  any  merger,
consolidation  or other  reorganization,  or disposition of all or substantially
all the assets, of the Company.

          3.22 Banking Relationships.  The Company Disclosure Schedule correctly
and  completely  lists all banks and  accounts  in such  banks,  with  which the
Company has deposits, indicating the names of those authorized to sign documents
with  respect  to such  accounts  as of the date of the most  recently  approved
banking resolution with respect to each.

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

          3.24 Execution and  Performance  of Agreement.  Except as set forth on
the Company Disclosure  Schedule,  the signing and performance by the Company of
this  Agreement,  including all other  agreements and  instruments  specifically
referred to herein, and the consummation of the Contemplated Transactions,  will
not violate any provision of, or result in the breach of or constitute a default
under any law, order, writ, injunction or decree of any court, governmental


                                       32
<PAGE>

agency or arbitration tribunal or of any contract,  agreement,  or instrument to
which the  Company is bound,  except  where the failure to do so will not have a
material  adverse  effect on the  Company.  Except  for those  required  by that
certain Agreement between the Company and Technair SRL ("Technair")  dated as of
July 26, 1995 (the  "Technair  Agreement"),  all  material  consents,  licenses,
authorizations  or permissions  necessary to the  performance of this Agreement,
the other  agreements and instruments  referred to herein,  and the Contemplated
Transactions  have been obtained or will be obtained  prior to the Closing Date.
This  Agreement and each other  agreement  executed and delivered by the Company
and the  Sellers  pursuant to the terms of this  Agreement,  have been or by the
Closing will be duly  executed and  delivered by the Company and the Sellers and
upon such  execution  constitute  legal,  valid and binding  obligations  of the
Company and the Sellers,  enforceable in accordance with their  respective terms
except  as  limited  by  applicable  bankruptcy,   insolvency,   reorganization,
moratorium  or other laws  relating to or  affecting  enforcement  of  creditors
rights, rules or laws concerning equitable remedies.

          4.  Representations  and  Warranties  of Sellers.  Each Seller,  as to
himself,  herself or itself only, represents and warrants, as of the Date of the
Deposit,  and except as set forth on the  Company  Disclosure  Schedule,  to the
Company and Buyer as follows:

          4.1  Ownership  of  Shares  and  Options.  Except  as set forth in the
Company  Disclosure  Schedule,  the Seller owns of record and  beneficially  the
number of Common Shares,  Preferred Shares and Options,  indicated opposite such
Seller's name in Exhibit A or Exhibit B hereto,  as applicable,  with full right
and authority to sell or exchange, as applicable, such securities hereunder, and
upon delivery of such Shares and/or Options hereunder,  the Buyer or the Company
as the case may be,  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 Buyer is a party

          4.2 Execution, Delivery and Enforceability of Agreement; No Violation.
This  Agreement  has been duly  executed  and  delivered  by or on behalf of the
Seller, and at the Closing any other documents required hereunder to be executed
and  delivered  by or on behalf of the Seller will have been duly  executed  and
delivered. This Agreement constitutes the legal, valid and binding obligation of
the Seller, enforceable against such Seller in accordance with its terms, except
as   enforcement   may  be  limited  by   applicable   bankruptcy,   insolvency,
reorganization,  fraudulent  conveyance,  moratorium  or  other  laws  affecting
creditor's  rights  generally.   Any  other  agreements  or  documents  required
hereunder to be executed and delivered by the Seller at Closing will  constitute
the  legal,  valid and  binding  agreements  of the 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.  Neither the execution of this  Agreement nor the
consummation of the  Contemplated  Transactions  by the Seller will violate,  or
constitute a default under, or permit the acceleration of maturity of, except to


                                       33
<PAGE>

the extent waived,  any indentures,  mortgages,  promissory notes,  contracts or
agreements  to which  such  Seller  is a party or by which  such  Seller or such
Seller's properties are bound.

          4.3  Information  Supplied.  To the Knowledge of such Seller,  neither
this  Agreement,  the  Company  Financial  Statements,  the  Company  Disclosure
Schedule, the Exhibits attached to this Agreement,  nor any other certificate or
document  furnished or to be furnished by the Company or the Sellers pursuant to
the terms of this Agreement,  contains or will contain any untrue statement of a
material fact known to the Seller or the Company, 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.

          4.4 Residence and Domicile. The Seller is a resident of, and domiciled
in, the State  indicated  on Exhibit A or Exhibit B hereto,  as  applicable,  as
being the residence of such Seller.

          4.5  Brokers or  Finders.  Except as set forth in Section  3.20 above,
neither the Seller or any of such Seller's  agents have 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
Contemplated Transactions.

          5.  Representations  and  Warranties of Buyer.  Buyer  represents  and
warrants  to Sellers  and the  Company,  as of the date hereof and except as set
forth in the Buyer's Disclosure Schedule, as follows:

          5.1  Organization  and  Good  Standing.  Buyer is a  corporation  duly
organized, validly existing, and in good standing under the laws of the State of
California.

          5.2 Execution, Delivery and Enforceability of Agreement; No Violation.
This  Agreement  has been duly  executed  and  delivered  by or on behalf of the
Buyer, and at the Closing any other documents  required hereunder to be executed
and  delivered  by or on behalf of the Buyer  will have been duly  executed  and
delivered. This Agreement constitutes the legal, valid and binding obligation of
the Buyer,  enforceable  against Buyer in accordance  with its terms,  except as
enforcement may be limited by applicable bankruptcy, insolvency, reorganization,
fraudulent  conveyance,  moratorium or other laws  affecting  creditor's  rights
generally.  Any other agreements required hereunder to be executed and delivered
by the Buyer at Closing will constitute the legal,  valid and binding agreements
of the Buyer,  enforceable  against the Buyer in accordance  with its respective
terms,   except  as  enforcement  may  be  limited  by  applicable   bankruptcy,
insolvency,  reorganization,  fraudulent  conveyance,  moratorium  or other laws
affecting  creditor's rights generally.  Neither the execution of this Agreement
nor the consummation of the  transactions  provided for herein by the Buyer will
violate,  or constitute a default under, or permit the  acceleration of maturity
of, except to the extent waived,  any indentures,  mortgages,  promissory notes,
contracts or  agreements  to which the Buyer is a party or by which the Buyer or
its  properties  are  bound.  Except  as set  forth  in the  Buyer's  Disclosure
Schedule, Buyer is not and will not be required to obtain any Consent from any


                                       34
<PAGE>

Person in connection  with the  execution and delivery of this  Agreement or the
consummation or performance of any of the Contemplated Transactions.

          5.3 Investment Intent.  Buyer is acquiring the Shares and Options from
the  Selling  Stakeholders  for its own  account  and not  with a view to  their
distribution  within the meaning of Section 2.11 of the Securities Act. Buyer is
a sophisticated business entity,  experienced in the business of the Company and
is able to evaluate the merits and risks of acquiring the Shares and Options.

          5.4 Certain Proceedings.  There is no pending Proceeding that has been
commenced  against Buyer that challenges,  or may have the effect of preventing,
delaying, making illegal, or otherwise interfering with, any of the Contemplated
Transactions. To Buyer's Knowledge, no such Proceeding has been threatened.

          5.5  Brokers  or  Finders.  Buyer and its  officers  and  agents  have
incurred no obligation or liability,  contingent or otherwise,  for brokerage or
finders' fees or agents' commissions or other similar payment in connection with
this Agreement.

          5.6  Information  Supplied.  Neither the Buyer's Annual Report on Form
10-K for the fiscal year ending December 31, 1994, nor Quarterly Reports on Form
10-Q for the quarters ending March 31, 1995, June 30, 1995 or September 30, 1995
contains any untrue  statement  of a material  fact or omits to state a material
fact necessary to make the statements  contained therein not misleading in light
of the circumstances under which such statements were made.

          5.7 No Material  Change.  Since September 30, 1995,  there has been no
material  adverse  change  in  the  Buyer's  business,   financial  position  or
operations.

          6.  Covenants  of the  Company  and  Sellers  Prior to Closing  Date.

          6.1 Conduct of Business  Pending  Closing.  Except as  contemplated by
this Agreement or otherwise agreed to by the Buyer in writing, prior to Closing,
the Company hereby covenants and agrees as follows:

          (a) The Company will carry on its  business in the Ordinary  Course of
Business and,  without  limiting the generality of the foregoing,  (i) not sell,
assign, lease, pledge,  mortgage,  encumber or otherwise dispose of or grant any
preferential  rights in any of its assets,  or incur or become obligated to pay,
any  liabilities,  except in the Ordinary  Course of  Business,  (ii) not pay or
prepay  any  obligation  or  liability  (fixed,  contingent  or  otherwise),  or
discharge or satisfy any lien or  encumbrance,  or settle any liability,  claim,
dispute,  proceeding, suit or appeal, pending or threatened against it or any of
its assets or properties, except for current liabilities included in the Company
Financial Statements and current liabilities incurred since December 31, 1995 in
the  Ordinary  Course of Business  or current  non-material  liabilities,  (iii)
except for individual  expenditures  and commitments made in the Ordinary Course
of  Business  and  involving  amounts  not  exceeding  $100,000,  not  make  any
expenditure  or  commitment  for  the  purchase,  acquisition,  construction  or
improvement of a capital asset,  (iv) use its Best Efforts to continue in effect
all existing policies of insurance (or comparable insurance) of or relating to


                                       35
<PAGE>

the Company,  (v) make such advances to, and investments in, each of the Company
Subsidiaries as are reasonably necessary for the proper operation of the Company
and each such Company  Subsidiary,  (vi) keep proper books of record and account
necessary to prepare financial  statements in accordance with GAAP and (vii) not
amend or terminate any Material  Contract in a manner that would have a material
adverse effect on the business,  financial  position or operating results of the
Company  or amend any  contract,  agreement  or  license to which it is a party,
which amendment would make it a Material  Contract,  unless such amendment would
not have a material  adverse  effect on the  business,  financial  condition  or
operating results of the Company and would not extend the term of such contract,
agreement or license by more than one year.

          (b) Except as required  by Section  8.2, no change will be made in the
authorized  or issued and  outstanding  capital  stock of the  Company,  and the
Company shall not issue or commit to issue any option,  warrant,  note,  bond or
other security convertible into shares of the Company's capital stock.

          (c)  Except  as set  forth  in the  Company  Disclosure  Schedule,  no
increase will be made in the  compensation  payable or to become  payable by the
Company to any of its directors,  officers,  employees,  agents,  consultants or
stockholders, including any stock options, bonus payments or other benefits.

          (d) The Company  will not effect or agree to effect any  amendment  or
supplement to, or extension of, any Employee Plan.

          (e) Except as required to make the  representations  and warranties in
Section 3.1(b) accurate,  the Company will not acquire any equity  securities or
similar  interest  in  any  other  corporation,   association,   joint  venture,
partnership,  business trust or other business entity,  or acquire the assets or
liabilities of any of the foregoing, or merge,  consolidate or otherwise combine
with any other corporation or other business entity, or enter into any agreement
providing for any of the foregoing.

          (f) The  Company  will not enter into or agree to enter into any other
contracts,  licenses or other  transactions other than in the Ordinary Course of
Business and, without  limiting the generality of the foregoing,  not enter into
or agree to enter into any contracts, agreements or instruments which are in the
nature  of  joint  venture   agreements,   non-compete   agreements,   franchise
agreements, exclusive license agreements, or other similar agreements.

          (g) Except as required by currently existing  agreements,  the Company
will not declare or pay any dividend on the outstanding  shares of the Company's
capital  stock in cash,  stock or property or redeem,  repurchase  or  otherwise
acquire any shares of the  Company's  capital  stock or enter into any agreement
providing for any of the foregoing.

                                       36
<PAGE>

          (h) The Company and the Sellers will not solicit or initiate proposals
or offers  from any person  relating  to any  acquisition  or purchase of all or
substantially  all of the assets of, or any equity  interest  in, the Company or
any  of  the  Company  Subsidiaries,  or  any  merger,  consolidation,  business
combination  or  similar  transaction  with the  Company  or any of the  Company
Subsidiaries,  or participate in any negotiations  regarding,  or furnish to any
other  person  any  confidential  information  with  respect  to,  or  otherwise
cooperate in any way with, or  participate  in,  facilitate  or  encourage,  any
effort or attempt by any other  person to do or seek any of the  foregoing.  The
Company shall  promptly  notify the Buyer if any such proposal or offer,  or any
inquiry or contact with any person with respect thereto, is made.

          (i) No change will be made with respect to the banking or safe deposit
arrangements of the Company:

          (j) The  Company  will  use  its  Best  Efforts  to  keep  intact  the
organization  of the Company;  to keep  available  the services of the Company's
present employees; and to preserve the goodwill of its suppliers,  customers and
others having business relations with the Company; and

          (k) The Company will timely file all required material tax returns and
promptly  pay all  federal,  state and local tax  assessments  and  governmental
charges lawfully levied or assessed upon it or upon its properties,  or upon any
part thereof,  which have become due and payable,  and the Company will withhold
from its  employee's  wages and pay over all federal and state taxes required to
be withheld and paid over.

          6.2 Advice of Changes.  Prior to the Closing  Date,  the Company  will
promptly advise the Buyer in writing of (i) any known event occurring subsequent
to the date of this Agreement which would render any  representation or warranty
of the Company  contained  in this  Agreement,  if made on and as of the date of
such event or the Closing Date,  untrue or  inaccurate  in any material  respect
(other  than an  event  so  affecting  a  representation  or  warranty  which is
expressly limited to a state of facts existing at a time prior to the occurrence
of such event), and (ii) any material adverse change in the business,  financial
position or operating results of the Company occurring subsequent to the date of
this Agreement.

          6.3 Access and Information.  The Company will, at all reasonable times
prior to the  Closing  Date and upon  reasonable  notice  from  Buyer,  open its
offices, books, accounts and records,  including policies,  claims of creditors,
and obligations of the Company,  and will,  upon  reasonable  notice from Buyer,
provide  free  access to the  Company's  management  to  discuss  the  Company's
business  operations,  assets,  liabilities,  actual or potential litigation and
claims,  properties and prospects,  to working papers,  files and records of its
accountants,  each for full and  unrestricted  examination and inspection by the
Buyer, its officers,  attorneys or accountants.  Without in any way limiting the
foregoing,  the Company shall, upon the reasonable  request of the Buyer,  allow
the Buyer and its representatives  access to any property owned or leased by the
Company or the Company  Subsidiaries  for the  performance  of an  environmental
audit (the "Environmental Audit"). No such examination or inspection shall in


                                       37
<PAGE>

any way affect,  diminish or terminate any of the  representations or warranties
of the  Company  or the  Sellers  hereunder  or the  right of the  Buyer to rely
thereon.

          6.4 Reasonable  Efforts.  Subject to the terms and  conditions  herein
provided,  the Company and each Seller shall use his, her or its Best Efforts to
(a) cause to be fulfilled and satisfied all of the  conditions to the Closing to
be fulfilled  and  satisfied by him, her or it and (b) cause to be performed all
of the matters required of him, her or it at the Closing.

          6.5  Supplements  to  Company  Disclosure  Schedule.  Sellers  and the
Company shall have the right, from time to time, on or prior to the Closing,  to
supplement the material set forth in the Company  Disclosure  Schedule initially
delivered  by the Company to Buyer.  Any  references  to the Company  Disclosure
Schedule in this Agreement or in any other  document  entered into in connection
with this Agreement shall mean the Company Disclosure  Schedule as fully amended
and supplemented on or prior to the Closing Date.

          7. Covenants of Buyer Prior to Closing Date.

          7.1 Access to Information.  Between the date of this Agreement and the
Closing Date, Buyer will afford Sellers and their  Representatives full and free
access,  upon the request of Sellers,  to copies of Buyer's public filings under
the Securities Act, the Exchange Act, and other information as Sellers and their
Representatives shall reasonably request.

          7.2 Approvals of Governmental Bodies. As promptly as practicable after
the date of this  Agreement,  Buyer  will,  and will cause  each of its  Related
Persons to, make all filings  required by Legal  Requirements to be made by them
to consummate the Contemplated Transactions.  Between the date of this Agreement
and the Closing  Date,  Buyer will,  and will cause each  Related  Person to (a)
cooperate  with Sellers with respect to all filings that Sellers are required by
Legal Requirements to make in connection with the Contemplated Transactions, and
(b) cooperate  with Sellers in obtaining all consents  identified in Part 3.2 of
the Company Disclosure Schedule.

          7.3 Supplements to Schedules. Buyer shall have the right, from time to
time, on or prior to the Closing,  to  supplement  the material set forth in any
schedule  initially  delivered  to the Company or the  Sellers  pursuant to this
Agreement.  Any references to the Buyer Disclosure Schedule in this Agreement or
in any other document  entered into in connection with this Agreement shall mean
such  schedules  as fully  amended and  supplemented  on or prior to the Closing
Date.

          7.4 Best Efforts. Subject to the terms and conditions herein provided,
the Buyer shall use its Best Efforts to (a) cause to be fulfilled  and satisfied
by it all of the  conditions  to the Closing to be  fulfilled or satisfied by it
and (b) cause to be performed all of the matters required of it at Closing.

                                       38
<PAGE>

          7.5  Advice of  Changes.  Prior to the  Closing  Date,  the Buyer will
promptly  advise  all of the other  parties  hereto in  writing of (i) any event
occurring  subsequent  to the date of this  Agreement  which  would  render  any
representation or warranty of the Buyer contained in this Agreement,  if made on
and as of the date of such event or the Closing  Date,  untrue or  inaccurate in
any  material  respect  (other than an event so  affecting a  representation  or
warranty which is expressly limited to a state of facts existing at a time prior
to the  occurrence of such event),  and (ii) any material  adverse change in the
business  affairs  of the  Buyer  occurring  subsequent  to  the  date  of  this
Agreement.

          7.6  Discussions  with  Technair.  Buyer shall give Mark H. Shipps the
right to participate in all meetings or discussions  which include  Technair and
Buyer  following  the  execution  of this  Agreement.  Buyer  shall use its Best
Efforts to facilitate cooperative and productive discussions among Technair, the
Company,  Buyer and Wheelabrator  EOS, Inc. and, if necessary,  shall reasonably
cooperate  to  transition  Technair to a new  distributor  if  Technair  and the
Company  agree that the  Company's  exclusive  rights to  distribute  Technair's
products in the U.S. shall be modified or terminated.

          8.  Conditions  Precedent  to  Buyer's  Obligation  to Close.  Buyer's
obligation to purchase the Shares and the Options from the Selling  Stakeholders
and to take the other  actions  required  to be taken by Buyer at the Closing is
subject  to the  satisfaction,  at or  prior  to the  Closing,  of  each  of the
following conditions (any of which may be waived by Buyer, in whole or in part):

          8.1  Accuracy  of  Representations.  Each of the  representations  and
warranties in Sections 3 and 4 of this Agreement (considered collectively),  and
each of these  representations and warranties  (considered  individually),  must
have been accurate in all material  respects as of the Date of the Deposit,  and
must be accurate in all  material  respects as of the Closing Date as if made on
the Closing Date.

          8.2 Conversion; Exchange.

          (a) The Selling  Stakeholders  shall have  converted  their  Preferred
Shares into Common Shares which conversion may be contingent upon, and effective
as of the time  of,  the  Closing.  Upon the  consummation  of the  Contemplated
Transactions,  (i) Buyer will own all of the  outstanding  stock of the Company,
which shall  consist of  2,921,481  Common  Shares,  and (ii) all of the Options
shall be cancelled at the Closing.

          (b) The  Management  Stakeholders  shall have  exchanged  their Common
Shares and their Options into the Notes, as contemplated by this Agreement.

          8.3 Material  Changes.  There shall be no material  adverse changes to
the business,  financial condition or operating results of the Company since the
Date of the Deposit.

                                       39
<PAGE>

          8.4 Sellers' and the Company's Performance.

          (a) All of the  covenants  and  obligations  that the  Sellers and the
Company are required to perform or to comply with pursuant to this  Agreement at
or prior to the Closing (considered  collectively),  and each of these covenants
and  obligations  (considered  individually),  must have been duly performed and
complied with in all material respects.

          (b)  Each  Seller  or the  Company,  as the  case  may be,  must  have
delivered each of the documents required to be delivered by such Seller pursuant
hereto  and each of the  other  covenants  and  obligations  in  required  to be
performed by Seller or the Company must have been performed and complied with in
all material respects.

          8.5 Consents. Each of the Consents required to be obtained pursuant to
Section 3.24 hereof to consummate the Contemplated  Transactions  must have been
obtained and must be in full force and effect.

          8.6  Additional  Documents.  Sellers  must have  caused the  following
documents to be delivered to Buyer:

          (a)  resolution  of the Board of Directors of the Company  authorizing
the Contemplated Transactions, certified by the Secretary of the Company;

          (b)  certificates  of good  standing from their  respective  states of
incorporation for the Company and each of the Company  Subsidiaries as of a date
no more than ten (10) days prior to the Closing Date.

          8.7   Termination  of   Stockholders'   Agreement8.7   Termination  of
Stockholders'   Agreement8.7   Termination  of  Stockholders'   Agreement.   The
Stockholders' Agreement, dated as of June 12, 1990, by and among the Company and
certain of its stockholders  (including any subsequent amendments thereto) shall
have been terminated.

          8.8 No  Proceedings8.8No  Proceedings8.8  No  Proceedings.  Except for
matters arising out of the Technair Agreement, since the date of this Agreement,
there must not have been commenced or threatened in writing against Buyer or the
Company,  or  against  any Person  affiliated  with  Buyer or the  Company,  any
Proceeding (a) involving any material  challenge to, or seeking material damages
or injunctive  relief in connection with, any of the Contemplated  Transactions,
or (b) that may have the effect of  preventing,  delaying,  making  illegal,  or
otherwise  interfering  with  any of  the  Contemplated  Transactions;  provided
however that this Section 8.7 may not be relied upon by Buyer and this condition
will be deemed to have been waived by Buyer if Sellers agree to proceed to close
hereunder  and to  indemnify  Buyer  in full  against  any  damages  that may be
incurred by reason of any claim  described in this Section 8.8 without regard to
the limitations on indemnification set forth in Section 12.2 below.

          8.9 Approval of this  Agreement by Company  Board of  Directors.  This
Agreement and the agreements  referenced herein must be approved by the Board of


                                       40
<PAGE>

Directors of the Company and the  stockholders  of the  Company,  if required by
applicable law or the Company's Certificate of Incorporation or Bylaws.

          8.10 Company  Disclosure  Schedule.  The Company  shall have  provided
Buyer full and  complete  and final  copies of the Company  Disclosure  Schedule
which shall reflect no material  adverse  changes in the  Company's  business or
financial condition from the Date of the Deposit.

          8.11 Execution by Sellers.  All of the Sellers listed on Exhibit A and
Exhibit B hereto shall have executed this Agreement.

          8.12  Employment  Agreementnt.  The Employment  Agreement  required by
Section 2.6 hereof shall be in full force and effect.

          8.13 Resignations of Directors. All directors of the Company, with the
exception of Mark H.  Shipps,  shall have  resigned  effective as of the Closing
Date.

          8.14 Notes.  The Notes shall have been  executed and  delivered by the
Company to the Management Stakeholders.

          8.15 Note Agreement. A Note Agreement shall have been executed by each
of the Management Stakeholders.

          9.  Conditions  Precedent to Sellers'  Obligation  to Close.  Sellers'
obligations to sell or exchange the Shares and/or  Options,  as the case may be,
and to take the other actions  required to be taken by Sellers at the Closing is
subject  to the  satisfaction,  at or  prior  to the  Closing,  of  each  of the
following  conditions  (any of which may be waived by Sellers holding a majority
of the Shares, in whole or in part):

          9.1 Accuracy of  Representations.  All of Buyer's  representations and
warranties   in  Section  5  (considered   collectively),   and  each  of  these
representations  and  warranties  (considered  individually),   must  have  been
accurate in all material  respects as of the date of this  Agreement and must be
accurate  in all  material  respects  as of the  Closing  Date as if made on the
Closing Date.

          9.2 Approval of this  Agreement by Board of Directors.  This Agreement
and the agreements  referenced herein must be approved by the Board of Directors
of the Company.

          9.3 Buyer's Performance.

          (a) All of the  covenants  and  obligations  that Buyer is required to
perform or to comply with pursuant to this  Agreement at or prior to the Closing
(considered   collectively),   and  each  of  these  covenants  and  obligations
(considered  individually),  must have been  performed  and complied with in all
material respects.

                                       41
<PAGE>

          (b) Buyer must have  delivered  each of the  documents  required to be
delivered by Buyer  pursuant to Section 2.4 and must have made the cash payments
required to be made by Buyer pursuant to Section 2.

          9.4 Consents. Each of the Consents required to be obtained pursuant to
Section 3.24 hereof to consummate the Contemplated  Transactions  must have been
obtained and must be in full force and effect.

          9.5 Note  Agreement.  The Buyer shall have  executed and delivered the
Note Agreement in the form attached hereto as Exhibit D.

          9.6 Cancellation of the Options. At the Closing, each of the Buyer and
the  Company  shall  cancel all of the  Options  acquired by it pursuant to this
Agreement.

          9.7 No  Material  Adverse  Change.  There  shall have been no material
adverse change in Buyer's  business,  financial  condition or operating  results
from the date of this Agreement.

          9.8 Buyer's  Disclosure  Schedule.  The Buyer shall have  provided the
Company  full and complete  copies of Buyer's  Disclosure  Schedule  which shall
reflect no material adverse changes in Buyer's business,  financial condition or
operating results from the date of this Agreement.

          9.9  Additional  Documents.  Buyer must have caused to be delivered to
Sellers:

          (a) resolution of the Board of Directors of the Buyer  authorizing the
Contemplated Transactions, certified by the Secretary of Buyer; and

          (b)  Certificates  of good standing for the Buyer as of a date no more
than ten (10) days prior to the Closing Date.

          9.10 No  Proceedings.  Except for matters  arising out of the Technair
Agreement,  since the date of this Agreement, there must not have been commenced
or  threatened  in writing  against the  Company or any  Seller,  or against any
Person  affiliated with the Company or any Seller,  any Proceeding (a) involving
any material  challenge to, or seeking material damages or injunctive  relief in
connection with, any of the Contemplated Transactions,  or (b) that may have the
effect of preventing,  delaying,  making illegal, or otherwise  interfering with
any of the Contemplated Transactions; provided however that this Section 9.9 may
not be relied upon by the Company or Sellers and this  condition  will be deemed
to have been waived by the Sellers and the Company if Buyer agrees to proceed to
close  hereunder  and to  indemnify  the Company and Sellers in full against any
damages that may be incurred by reason of any claim described in this Section.

                                       42
<PAGE>

          9.11  Execution.  The Sellers  listed on Exhibit A and Exhibit B shall
have executed this Agreement.

          9.12  Employment  Agreement.  The  Employment  Agreement  required  by
Section 2.6 hereof shall be in full force and effect.

          10. Covenants After the Closing Date.

          10.1  Litigation  Support.  In the  event and for so long as any party
actively is  contesting  or  defending  against any  action,  suit,  proceeding,
hearing, investigation, charge, complaint, claim, or demand in connection with:

          (a) any of the Contemplated Transactions; or

          (b) any fact, situation,  circumstance,  status, condition,  activity,
practice,  plan,  occurrence,   event,  incident,  action,  failure  to  act  or
transaction  on or prior to the Closing Date involving any of the Company or the
Company  Subsidiaries,  then the other  party  shall  cooperate  with it and its
counsel in the defense or contest, make available its personnel and provide such
testimony  and  access  to its  books  and  records  as  shall be  necessary  in
connection with the defense or contest,  all at the sole cost and expense of the
contesting  or defending  party  (unless the  contesting  or defending  party is
entitled to indemnification under Section 12 hereof).

          10.2 Employment Incentives1.  For a period of at least three (3) years
following  the  Closing,  employees  of the  Company  shall  continue to receive
performance-based  compensation  generally  consistent  with the practice of the
Company in the years prior to the Closing.

          11. Termination11.

          11.1 Automatic  Termination Events. This Agreement will terminate,  as
of 5:00 p.m.  Pacific time, on February 12, 1996,  without any further action by
any party  hereto,  if the  Deposit is not  received  by the Escrow  Agent on or
before such date and time.

          11.2 Other Termination  Events.  This Agreement may also be terminated
after the Date of the Deposit:

          (a) by written  notice  delivered  to the other  parties  hereto at or
prior to the Closing

          (i) by (A) Buyer if a Breach of any  provision of this  Agreement  has
been committed by any Seller or by the Company or (B) the Company if a Breach of
any provision of this Agreement has been committed by the Buyer, and such Breach
set forth in (A) or (B) has not been waived, or cured within ten (10) days after
receipt of written  notice of such Breach by the party  against whom such Breach
is alleged; provided, however, that the Buyer shall not be permitted to


                                       43
<PAGE>

terminate  this  Agreement  based on any Breach by the  Company or Seller  which
relates in any manner to Technair unless Buyer can demonstrate  that such Breach
resulted  primarily from actions of the Company and/or Sellers unrelated to this
Agreement,  the Contemplated  Transactions or Buyer's discussions with Technair;
or

          (ii)  by the  Buyer  if the  supplements  to  the  Company  Disclosure
Schedule,  made pursuant to Section 6.5,  disclose a material  adverse change in
the business,  financial position or operating results of the Company, from that
set forth on the Company  Disclosure  Schedule as  delivered to the Buyer on the
date hereof and supplemented on or before the Date of the Deposit;

          (b) by written  notice  delivered  to the other  parties  hereto at or
prior to the Closing

          (i) by  Buyer  if any of the  conditions  in  Section  8 has not  been
satisfied  as of the Closing Date or if  satisfaction  of such a condition is or
becomes  impossible  (other than through the failure of Buyer to comply with its
obligations  under this Agreement) and Buyer has not waived such condition on or
before the Closing Date; or

          (ii) by Sellers owning a majority of the Shares or the Company, if any
of the  conditions in Section 9 has not been satisfied as of the Closing Date or
if satisfaction of such a condition is or becomes impossible (other than through
the  failure of Sellers or the Company to comply  with their  obligations  under
this Agreement) and Sellers and the Company have not waived such condition on or
before the Closing Date;

          (c) by mutual consent of Buyer and the Company; or

          (d) by written  notice  delivered to the other  parties  hereto at any
time after  March 15,  1996 by the  Buyer,  the  Company  or  Sellers  holding a
majority of the Shares,  if the Closing has not occurred (other than through the
failure of any party  seeking to terminate  this  Agreement to comply fully with
its obligations  under this Agreement) on or before March 15, 1996 or such later
date as the parties may agree upon.

          11.3 Effect of Termination.

          (a) In the event of the  termination  of this  Agreement  pursuant  to
Section 11.1,  no party shall have any  liability to any other party  hereunder;
provided,  however,  that the  obligations in Sections 13.1, 13.2 and 13.3 shall
survive.

          (b) Each party's  right of  termination  under  Section 11.2 after the
Date of the Deposit is in  addition  to any other  rights it may have under this
Agreement or otherwise,  and the exercise of a right of termination  will not be
an election of remedies.  If this  Agreement is  terminated  pursuant to Section
11.2,  all  further  obligations  of  the  parties  under  this  Agreement  will
terminate, except as follows:

                                       44
<PAGE>

          (i) The obligations in Sections 13.1, 13.2 and 13.3 will survive;

          (ii) The obligations of Buyer pursuant to Section 12.3(a) will survive
if Buyer has paid the Deposit and either this Agreement has been  terminated due
to a Breach  by Buyer or this  Agreement  has been  terminated  by Buyer for any
reason other than a Breach by the Company or any Seller;

          (iii) If this Agreement is terminated by a party because of the Breach
of the  Agreement by another party the  terminating  party's right to pursue all
legal remedies will survive such termination unimpaired.

          (c) In the event that this Agreement is terminated pursuant to Section
11.2,  the Escrow  Agent shall take the  following  actions  with respect to the
Deposit:

          (i) If Buyer has terminated  the Agreement  because of a Breach of the
Agreement  by the  Company or by the  Sellers,  the Escrow  Agent  shall pay the
Deposit to the Buyer;

          (ii)  If  Buyer  and the  Company  mutually  agree  to  terminate  the
agreement, the Escrow Agent shall pay the Deposit to the Buyer;

          (iii) If the  Company or the Sellers  have  terminated  the  Agreement
because of a Breach of the  Agreement  by Buyer,  the Escrow Agent shall pay the
Deposit to the Company; and

          (iv) If the Company or the Sellers have  terminated  the Agreement for
any reason other than a Breach of the Agreement by Buyer, the Escrow Agent shall
pay the Deposit to the Buyer.

          12. Indemnification; Remedies.

          12.1 Survival.  Notwithstanding any investigation  conducted before or
after the Closing  Date,  the  parties  hereto will be entitled to rely upon the
representations  and  warranties of the other  parties  hereto set forth in this
Agreement  (as  modified  by each  party's  Disclosure  Schedule  attached as an
Exhibit to this Agreement). All representations and warranties in this Agreement
or in any instrument delivered pursuant to this Agreement will survive until the
date one (1) year after the Closing Date, at which time the  representations and
warranties  set forth in this  Agreement and all liability of the parties hereto
with respect to those  representations and warranties will terminate;  provided,
however,  that  thereafter a party hereto will remain liable with respect to any
claim of Breach of a  representation  or warranty  provided  such claim has been
asserted in writing  (specifying  in  reasonable  detail the basis and amount of
such claim) on or before the date one (1) year after the Closing Date until such
time as said claim has been finally decided, settled, or adjudicated.

                                       45
<PAGE>

          12.2 Indemnification and Reimbursement by Sellers.

          (a) In the event the Company or any of the Sellers commits a Breach of
any of his, her or its  representations or warranties or commits a Breach of any
of his, her or its  covenants or  obligations  contained in this  Agreement  and
provided  that  Buyer  makes a written  claim for  indemnification  against  the
Sellers  within  one (1) year  after  the  Closing  Date  then,  subject  to the
limitations  set forth in  Section  12.2(b),  each of the  Sellers  set forth on
Exhibit G (the "Indemnifying  Sellers"),  severally in the percentages and up to
the amounts set forth on Exhibit G, agrees to indemnify and hold harmless Buyer,
the  Company and their  respective  Representatives,  stockholders,  controlling
persons and affiliates  (collectively,  the "Buyer's Indemnified Persons"),  and
will reimburse the Buyer's Indemnified Persons for any loss,  liability,  claim,
damage, and expense (including costs of investigation and defense and reasonable
attorneys'  fees)  whether or not  involving a third party claim  (collectively,
"Damages"),  which the Buyer's  Indemnified Persons may suffer through and after
the date of the claim for  indemnification,  arising from or in connection  with
any Breach of any representation or warranty, or covenant made by the Company or
the Sellers in this Agreement.  Subject to the foregoing and the limitations set
forth in Section 12.2(b),  each Seller shall be solely  responsible for a Breach
of such Seller's  representations  and warranties  under Section 4 hereof and no
other Seller shall have any liability therefor.

          (b) The  obligation  of the  Indemnifying  Sellers  to  indemnify  the
Buyer's  Indemnified Persons pursuant to Section 12.2(a) shall be subject to the
conditions and limitations of this Agreement including,  without limitation, the
following:

          (i)  The  Buyer's   Indemnified  Persons  shall  not  be  entitled  to
indemnification  hereunder unless the aggregate Damages exceed $150,000 and then
such indemnification  obligation shall extend only to the amount of such excess;
provided, however, that if a single Breach of any representation or warranty has
resulted in Damages exceeding $150,000,  then the indemnification  obligation of
the  Indemnifying  Sellers  pursuant to Section  12.2(a) shall not be limited by
this Section 12.2(b)(i);

          (ii) The  indemnification  obligation  of any  Management  Stakeholder
shall be payable in cash or at such Management  Stakeholder's option,  through a
setoff  reduction in the  principal  amount of the Note held by such  Management
Stakeholder;

          (iii) In no event  shall  the  Indemnifying  Sellers  be  required  to
indemnify the Buyer's Indemnified Persons for any Damages after the Indemnifying
Sellers have, in the aggregate, paid indemnification obligations (whether in the
form of cash or a setoff of the Notes) aggregating $1,500,000;

          (iv)  Indemnifying  Sellers  shall not be  required to  indemnify  the
Buyer's  Indemnified  Persons  for any  Breach  which  relates  in any manner to
Technair unless Buyer can demonstrate  that such Breach resulted  primarily from
actions of the  Company  and/or the Sellers  unrelated  to this  Agreement,  the
Contemplated Transactions or Buyer's discussions with Technair;

                                       46
<PAGE>

          (v) The indemnification  provided by the Sellers in this Section 12 to
the  Buyer's  Indemnified  Persons  shall  be the  sole  remedy  of the  Buyer's
Indemnified  Persons for any claims  relating to the  Contemplated  Transactions
except in the event of fraud by the Sellers or the Company.

          12.3  Indemnification  and Reimbursement by Buyer.

          (a) In the event that the  Company,  any of the  Sellers or any of the
directors of the Company are subject to any damages  arising out of the Technair
Agreement  as a  result  of this  Agreement  or the  Contemplated  Transactions,
("Technair  Damages")  then the Buyer agrees to indemnify and hold harmless such
Sellers and  directors  of the Company  and each of them,  and their  respective
heirs,   representatives,   fiduciaries,   controlling  persons  and  affiliates
(collectively,  the  "Sellers'  Indemnified  Persons"),  and will  reimburse the
Sellers'  Indemnified  Persons  from any  Technair  Damages  which the  Sellers'
Indemnified  Persons  may  suffer  through  and  after the date of the claim for
indemnification.

          (b)  In  the  event  the  Buyer   commits  a  Breach  of  any  of  its
representations  and  warranties  or commits a Breach of any of its covenants or
obligations  contained in this  Agreement  and provided  that the Sellers make a
written  claim for  indemnification  against the Buyer within one (1) year after
the Closing  Date,  the Buyer agrees to indemnify  and hold harmless the Sellers
Indemnified  Persons and will  reimburse  the Sellers'  Indemnified  Persons for
Damages, which the Sellers' Indemnified Persons may suffer through and after the
date of the claim for  indemnification,  arising from and in connection with any
Breach of any  representation  or  warranty  or  covenant  made by Buyer in this
Agreement.

          12.4 Procedure for Indemnification of Third Party Claims.

          (a) Promptly after receipt by an indemnified  party under Section 12.2
or Section 12.3 of notice of the commencement of any Proceeding against it, such
indemnified  party will, if a claim is to be made against an indemnifying  party
under such Section, give notice to the indemnifying party of the commencement of
such claim,  but the failure to notify the  indemnifying  party will not relieve
the  indemnifying  party of any  liability  that it may have to any  indemnified
party,  except to the extent that the indemnifying  party  demonstrates that the
indemnifying party is prejudiced by the indemnified party's failure to give such
notice, and then only to the extent of such prejudice.

          (b) If any  Proceeding  referred  to in  Section  12.4(a)  is  brought
against an  indemnified  party and such  indemnified  party gives  notice to the
indemnifying  party of the  commencement of such  Proceeding,  the  indemnifying
party will be entitled to actively  participate in such  Proceeding  and, to the
extent that the indemnifying  party wishes (unless the indemnifying  party fails
to  provide  reasonable  assurance  to the  indemnified  party of its  financial
capacity to defend such Proceeding and provide indemnification with respect to


                                       47
<PAGE>

such  Proceeding),  to  assume  the  defense  of such  Proceeding  with  counsel
reasonably satisfactory to the indemnified party and, from and after notice from
the  indemnifying  party to the indemnified  party of the  indemnifying  party's
election to assume the defense of such Proceeding,  the indemnifying  party will
not, as long as the  indemnifying  party  diligently  conducts such defense,  be
liable to the  indemnified  party under this  Section 12 for any fees of counsel
(other than that selected by the indemnifying  party) or any other expenses with
respect  to the  defense  of such  Proceeding,  in  each  case  incurred  by the
indemnified  party  subsequent to such notice of election from the  indemnifying
party in connection with the defense of such  Proceeding,  other than reasonable
costs of  investigation.  If the  indemnifying  party  assumes  the defense of a
Proceeding,  (i) no  compromise  or settlement of such claims may be effected by
the indemnifying party without the indemnified party's consent,  which shall not
be  unreasonably  withheld,  unless (A) there is no finding or  admission of any
violation of Legal  Requirements or any material  violation of the rights of any
Person  and no  material  effect  on any  claims  than may be made  against  the
indemnified party, and (B) the sole relief provided is monetary damages that are
paid in full by the indemnifying  party;  and (ii) the  indemnifying  party will
have no liability  with respect to any  compromise  or settlement of such claims
effected  without its  consent,  which shall not be  unreasonably  withheld.  If
notice is given to an indemnifying  party of the  commencement of any Proceeding
and the  indemnifying  party  does  not,  within  twenty  (20)  days  after  the
indemnified party's notice is given, give notice to the indemnified party of its
election to assume the defense of such Proceeding,  the indemnifying  party will
be bound by any  determination  made in such  Proceeding  or any  compromise  or
settlement effected by the indemnified party.

          (c) Notwithstanding the foregoing,  if an indemnified party determines
in good faith that  there is a  reasonable  probability  that a  Proceeding  may
adversely affect it or its affiliates other than as a result of monetary damages
for which it would be  entitled to  indemnification  under this  Agreement,  the
indemnified party may, by notice to the indemnifying party, assume the exclusive
right to defend,  compromise,  or settle such  Proceeding,  but the indemnifying
party will not be bound by any  determination of a Proceeding so defended or any
compromise  or  settlement  effected  without  its  consent  (which  may  not be
unreasonably withheld).

          (d) Sellers and Buyer hereby consent to the non-exclusive jurisdiction
of any court in which a Proceeding is brought against any indemnified person for
purposes of any claim that an  indemnified  person may have under this Agreement
with respect to such Proceeding or the matters alleged  therein,  and agree that
process may be served on Sellers or Buyer with respect to such a claim  anywhere
in the world.  Nothing in this Section  12.4(d) shall be construed as in any way
affecting the terms of Section 13.5 hereof.

          12.5  Benefits.  The amount of any  Damages  payable  by either  party
hereunder  shall be reduced by any net tax benefit or other benefit  received by
the indemnified party as a result of such claim or proceeding which gave rise to
the Damage  obligation of the indemnifying  party.  The indemnified  party shall
have the obligation to reasonably  mitigate the losses to the indemnifying party
from any claim for Damages.

                                       48
<PAGE>

          12.6 Insurance  Proceeds.  In determining the amount of any Damages or
expenses for which any party is entitled to  indemnification  under this Section
12, the gross amount thereof will be reduced by any insurance  proceeds realized
or to be realized by such party.

          12.7  Procedure  for  Indemnification  - Other  Claims.  A  claim  for
indemnification for any matter not involving a third party claim may be asserted
by notice to the party from whom indemnification is sought.

          12.8 Agents of Indemnifying  Sellers for Purposes of  Indemnification;
Contribution Obligation of All Sellers.

          (a) Each of the  Indemnifying  Sellers  hereby  appoints  Kevin  Mohan
(representing Summit Investors, L.P., Summit Ventures, L.P., Summit Ventures II,
L.P. and SV Eurofund C.V.), Charles Hamilton (representing Environmental Venture
Fund) and Mark Shipps (representing  Management Stakeholders) as his, her or its
agents  (the  "Agents")  for  purposes of handling  all  indemnification  claims
hereunder. If any one of the foregoing is unable or unwilling to serve, then the
remaining  individuals shall  collectively  serve as Agents for purposes of this
Section 12 until a replacement is designated  pursuant to Section 12.8(e).  Each
Indemnifying  Seller  agrees  that the  Agents,  acting by vote of a majority in
interest (as  described on Exhibit G) of the  Indemnifying  Sellers,  shall have
authority to act on such Indemnifying Seller's behalf, to arrange for and handle
all matters related to a defense of any  indemnification  action required of the
Indemnifying  Sellers hereunder,  to compromise any claim, to settle any amount,
and otherwise to take any action as the Agents shall deem necessary or advisable
in connection with the Sellers'  indemnification  obligations under this Section
12.

          (b) All Sellers will be bound by the  decisions of the Agents and each
Seller shall  reimburse and contribute to the  Indemnifying  Sellers his, her or
its pro rata share (in accordance  with the  percentages set forth on Exhibits A
and B) of any indemnification  obligations of the Indemnifying Sellers resulting
under this  Section 12 based  upon the  decisions  of the Agents so long as such
decisions are made by the Agents in good faith, acting reasonably.

          (c) Upon the  resignation  or inability to serve of any of the Agents,
the  resulting  vacancy  shall be filled by the  Indemnifying  Seller or Sellers
represented by the individual who has resigned or otherwise is unable to serve.

                                       49
<PAGE>

          13. General Provisionsal.

          13.1  Expenses.   Except  as  otherwise  expressly  provided  in  this
Agreement,  each party to the  Agreement  will bear his,  her or its  respective
expenses incurred in connection with the preparation, execution, and performance
of this  Agreement  and the  Contemplated  Transactions,  including all fees and
expenses  of  agents,  representatives,   counsel,  and  accountants;  provided,
however,  that upon the Closing of the Contemplated  Transactions,  the fees and
expenses  of Calfee,  Halter & Griswold  shall be divided  equally  between  the
Company and the Sellers up to a maximum obligation of $50,000 for the Company.

          13.2 Public  Announcements.  No party shall issue any press release or
make any public  announcement  related to the subject  matter of this  Agreement
prior to the Closing  without the prior written  approval of the Company and the
Buyer;  provided,  however,  that any party may make any  public  disclosure  it
believes in good faith is required by  applicable  law or any listing or trading
agreement concerning the publicly-traded securities of such party (in which case
the disclosing  party will use its  reasonable  best efforts to advise the other
party prior to making the disclosure and consult with the other party  regarding
the  content  thereof).  The  Company  and Buyer  will  consult  with each other
concerning the means by which the Company's  employees,  customers and suppliers
and others having dealings with the Company will be informed of the Contemplated
Transactions.

          13.3 Confidentiality.  Between the date of this Agreement and five (5)
years after the date hereof, Buyer and Sellers will maintain in confidence,  and
will cause the directors, officers, employees, agents, and advisors of Buyer and
the Company to maintain in  confidence,  and not use to the detriment of another
party or the  Company  any  written,  oral,  or other  information  obtained  in
confidence  from another party or the Company in connection  with this Agreement
or  the  Contemplated  Transactions,  expressly  including  the  reports  of all
consultants  retained  pursuant to the terms of this Agreement,  unless (a) such
information  becomes publicly  available through no fault of such party, (b) the
use of such  information  is  necessary or  appropriate  in making any filing or
obtaining  any  consent  or  approval  required  for  the  consummation  of  the
Contemplated  Transactions,  or (c) the furnishing or use of such information is
required by legal proceedings.

          If the Contemplated Transactions are not consummated,  each party will
return or destroy as much of such  written  information  as the party  providing
such information may reasonably request.

          13.4 Notices. All notices, consents, waivers, and other communications
under this  Agreement  must be in  writing  and will be deemed to have been duly
given when (a) delivered by hand (with  written  confirmation  of receipt),  (b)
sent by telecopier (with written confirmation of receipt),  provided that a copy
is mailed  within three (3) business  days by registered  mail,  return  receipt
requested,  (c)  when  received  by  the  addressee,  if  sent  by a  nationally
recognized  overnight  delivery  service (receipt  requested),  or (d) three (3)
business days after being sent by registered or certified mail, return receipt


                                       50
<PAGE>

requested,  in each case to the appropriate addresses and telecopier numbers set
forth below (or to such other  addresses and  telecopier  numbers as a party may
designate by notice to the other parties):

          Sellers:                 To each Seller at the address set forth on
                                   Exhibits A or B

          The Company:             Organic Waste Technologies, Inc.
                                   7550 Lucerne Drive, Suite 110
                                   Cleveland, Ohio  44130
                                   Attn:  Mark H. Shipps, President
                                   Fax No.:  (216) 891-8288

          with a copy to:          Dale C. LaPorte, Esq.
                                   Calfee, Halter & Griswold
                                   1400 McDonald Investment Center
                                   800 Superior Avenue
                                   Cleveland, Ohio 44114-2688
                                   Fax No.:  (216) 241-0816

          Buyer:                   EMCON
                                   400 S. El Camino Real, Suite 1200
                                   San Mateo, California  94402
                                   Attention:  R. Michael Momboisse, Esq.
                                   Fax No.:  (415) 375-0763

          with a copy to:          Gray Cary Ware & Freidenrich
                                   400 Hamilton Avenue
                                   Palo Alto, California 94301
                                   Attention:  Eric J. Lapp, Esq.
                                   Fax No.:  (415) 327-3699

          13.5  Binding  Arbitration;  Service  of  Process.  In the  event of a
dispute  between the parties  related to or arising out of this  Agreement,  the
Agents and representatives of the Buyer and the Company will meet promptly in an
effort to resolve the dispute  amicably.  If such  parties  cannot  agree upon a
resolution  within  thirty (30) days of any such party  requesting a meeting for
resolution  of a dispute,  then the matter will promptly be submitted to binding
arbitration in accordance with this Section 13.5.

          (a)  Arbitration  will  be  held  in  San  Francisco,  California,  in
accordance  with  the  rules  and   regulations  of  the  American   Arbitration
Association.  The  number of  arbitrators  will be one and will be  selected  in
accordance  with  the  rules  and   regulations  of  the  American   Arbitration
Association.  The determination of the arbitrator will be conclusive and binding
upon the parties,  and any  determination  by the  arbitrator of an award may be
filed with the clerk of a court of competent jurisdiction as a final


                                       51
<PAGE>

adjudication of the claim involved, or application may be made to such court for
judicial  acceptance of the award and an order of  enforcement,  as the case may
be. Except to the extent otherwise  directed by the arbitrator,  each party will
bear its own expenses, including legal and accounting fees, if any, with respect
to the arbitration,  and one-half of the costs of the arbitrator and of the fees
imposed by the American Arbitration Association.

          (b) In any arbitration  hereunder,  the demand for  arbitration  shall
specifically  delineate the claims asserted and the material issues with respect
thereto. Within thirty (30) days after filing a demand for arbitration, claimant
shall provide to respondent a list of all fact witnesses known to claimant,  the
names and curriculum  vitae of each expert  witness  anticipated to be called by
claimant,  and a copy of  relevant  documents.  Within  thirty  (30) days  after
receipt of the  foregoing  information,  respondent  shall provide to claimant a
list of all fact witnesses known to respondent,  the names and curriculum  vitae
of each expert witness  anticipated  to be called by  respondent,  and a copy of
relevant documents known to respondent. Within ten (10) days after discovery has
been closed by the arbitrator  (but in no event later than sixty (60) days prior
to the arbitration hearing),  claimant shall present to respondent a list of all
fact and expert witnesses anticipated to be called by claimant, a summary of the
substance  of  each  such  witness'  testimony,  and a  list  of  all  documents
anticipated  to be introduced  by claimant (and a copy of such  documents if not
previously provided to respondent). Within thirty (30) days after receipt of the
foregoing  information,  respondent shall present to claimant a list of all fact
and expert  witnesses  anticipated to be called by respondent,  a summary of the
substance  of  each  such  witness'  testimony,  and a  list  of  all  documents
anticipated to be introduced by respondent  (and a copy of such documents if not
previously  provided to claimant).  Any award by the arbitrator shall be subject
to all dollar and other limitations set forth in this Agreement.

          (c) A demand  for  arbitration  may be served on Buyer or  Sellers  by
certified U.S. Mail, postage prepaid, or reliable overnight delivery service, to
the address set forth in Section 13.4 hereof.

          13.6 Further Assurances. The parties agree (a) to furnish upon request
to each other such further information, (b) to execute and deliver to each other
such other documents, and (c) to do such other acts and things, all as the other
party may reasonably  request for the purpose of carrying out the intent of this
Agreement and the documents referred to in this Agreement.

          13.7 Waiver.  The rights and remedies of the parties to this Agreement
are  cumulative  and not  alternative.  Neither the failure nor any delay by any
party in exercising any right,  power,  or privilege under this Agreement or the
documents  referred to in this Agreement will operate as a waiver of such right,
power, or privilege, and no single or partial exercise of any such right, power,
or privilege will preclude any other or further  exercise of such right,  power,
or privilege or the exercise of any other right,  power,  or  privilege.  To the
maximum extent permitted by applicable law, (a) no claim or right arising out of
this Agreement or the documents  referred to in this Agreement can be discharged
by one party,  in whole or in part, by a waiver or  renunciation of the claim or
right  unless in writing  signed by the other  party;  (b) no waiver that may be
given by a party will be applicable except in the specific instance for which it


                                       52
<PAGE>

is given;  and (c) no  notice  to or demand on one party  will be deemed to be a
waiver of any  obligation of such party or of the right of the party giving such
notice or demand to take further  action without notice or demand as provided in
this Agreement or the documents referred to in this Agreement.

          13.8 Entire Agreement and Modification.  This Agreement supersedes all
prior  agreements  between the parties  with  respect to its subject  matter and
constitutes  (along with the documents referred to in this Agreement) a complete
and exclusive  statement of the terms of the agreement  between the parties with
respect to its subject  matter.  This  Agreement may not be amended  except by a
written agreement executed by the party to be charged with the amendment.

          13.9 Company Disclosure Schedule.sclosure Schedule.

          (a) The disclosures in the Company Disclosure  Schedule,  and those in
any Supplement  thereto,  must relate only to the representations and warranties
in the Section of the  Agreement to which they  expressly  relate and not to any
other representation or warranty in this Agreement,  unless it is obvious,  from
the  disclosure,  in light of the  circumstances  under which such disclosure is
made, that other representations and warranties are affected thereby.

          (b) In the event of any  inconsistency  between the  statements in the
body of this Agreement and those in the Company Disclosure  Schedule (other than
an exception expressly set forth as such in the Company Disclosure Schedule with
respect to a specifically identified representation or warranty), the statements
in the body of this Agreement will control.

          13.10  Assignments,  Successors,  and No Third Party  Rights.  Neither
party may assign  any of its  rights  under  this  Agreement  without  the prior
consent of the other parties,  which will not be unreasonably  withheld,  except
that Buyer may assign any of its rights under this  Agreement to any  Subsidiary
of Buyer but Buyer will not be relieved of its obligations hereunder as a result
of such assignment. Subject to the preceding sentence, this Agreement will apply
to, be binding in all respects  upon, and inure to the benefit of the successors
and permitted  assigns of the parties.  Nothing expressed or referred to in this
Agreement  will be  construed  to give any Person other than the parties to this
Agreement any legal or equitable right,  remedy,  or claim under or with respect
to this Agreement or any provision of this Agreement.  This Agreement and all of
its  provisions  and  conditions  are for the sole and exclusive  benefit of the
parties to this Agreement and their successors and assigns.

          13.11 Severability. If any provision of this Agreement is held invalid
or unenforceable by any court of competent jurisdiction, the other provisions of
this  Agreement  will remain in full force and  effect.  Any  provision  of this
Agreement  held invalid or  unenforceable  only in part or degree will remain in
full force and effect to the extent not held invalid or unenforceable.

          13.12 Section Headings, Construction. The headings of Sections in this
Agreement are provided for convenience only and will not affect its construction
or  interpretation.  All  references  to "Sections"  refer to the  corresponding


                                       53
<PAGE>

Sections of this  Agreement.  All words used in this Agreement will be construed
to be of such gender or number as the  circumstances  require.  Unless otherwise
expressly  provided,  the word "including" does not limit the preceding words or
terms.

          13.13  Interpretation of Agreement.  This Agreement has been submitted
to the scrutiny of all parties hereto and their respective  counsel and shall be
given a fair and reasonable  interpretation without consideration being given to
its having been drafted by either party or its counsel.

          13.14 Time of Essence.  With regard to all dates and time  periods set
forth or referred to in this Agreement, time is of the essence.

          13.15  Governing Law. This Agreement will be governed by and construed
under the laws of the State of  Delaware  without  regard to  conflicts  of laws
principles.

          13.16  Counterparts.  This  Agreement  may be  executed in one or more
counterparts,  each of  which  will be  deemed  to be an  original  copy of this
Agreement and all of which,  when taken  together,  will be deemed to constitute
one and the same agreement.


                                       54
<PAGE>


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







          THE BUYER

          EMCON, a California corporation


          By:    /s/ Eugene M. Herson
                ---------------------------
          Its: President & Chief Financial Officer





            THE COMPANY

            ORGANIC WASTE TECHNOLOGIES, INC, a Delaware
            corporation


            By:   /s/ Mark. Shipps
                  -------------------
            Its:   President



                                       55
<PAGE>



                       SELLING STAKEHOLDERS

                       SUMMIT INVESTORS, L.P.

                       By:    /s/
                              ---------------------
                       Its:   ---------------------


                       SUMMIT VENTURES, L.P.

                         By:    /s/
                              ---------------------
                       Its:   ---------------------


                       SUMMIT VENTURES II, L.P.

                       By:    /s/
                              --------------------
                       Its:   --------------------


                      SV EUROFUND C.V.

                       By:    /s/
                              -------------------
                       Its:   -------------------


                       McDONALD & COMPANY
                       SECURITIES, INC.

                       By:    /s/
                              ------------------
                       Its:   ------------------


                       ENVIRONMENTAL VENTURE FUND

                       By:    /s/
                              ------------------
                       Its:   ------------------


                                       56
<PAGE>

                               /s/
                              -----------------
                       M. B. LINGAFELTER


                       SEELEY, SAVIDGE & AUSSEM

                       By:    /s/
                              ------------------
                       Its:   ------------------


                            /s/
                            -------------------
                       G. ROEBUCK


                            /s/
                            ------------------
                        JOHN PACEY


                            /s/
                            ------------------
                       GENE OSTROW


                            /s/
                       ------------------
                       BARRY ROGERS


                            /s/
                       ------------------
                       ALAN GREEN


                            /s/
                       ------------------
                       GORDON NEUFELD


                            /s/
                       ------------------
                       DONALD HERSHMAN


                            /s/
                       ----------------
                       DONALD JOHNSON


                            /s/
                       -----------------
                       DENNIS HINDERER
                            /s/


                            /s/
                       ----------------
                       MICHAEL ROGOZINSKI


                                       57
<PAGE>

                            /s/
                       -------------------
                       RANDALL W. CHAPMAN


                            /s/
                       -------------------
                       HARRY ZERNECHEL


                            /s/
                       -------------------
                       LOUIS KALANI


                            /s/
                       -------------------
                       RANDY MASUKAWA


                            /s/
                       -------------------
                       STEVAN J. INGWERSEN


                            /s/
                       -------------------
                       MICHAEL C. MAURER


                            /s/
                       ----------------------
                       ELIZABETH L. WILLIAMS


                       MANAGEMENT STAKEHOLDERS


                            /s/
                       ---------------------
                       MARK H. SHIPPS


                            /s/
                       ---------------------
                       ANTHONY A. ALEXANDER


                                       57
<PAGE>

                            /s/
                       ---------------------
                       JAMES HELMICK


                            /s/
                       -----------------------
                       RAYMOND J. NARDELLI


                           /s/
                       -----------------------
                       STEPHEN LINGAFELTER


                                       58
<PAGE>

<TABLE>
<CAPTION>
EXHIBIT A.
Schedule of Selling Stakeholders Receiving Cash


                                                                        Preferred Stock
                                                       ------------------------------------------------
                          State of                                                                            Options   Options
MANAGEMENT                Residence         Common     Series A      Series B-1  Series B-2    Series C        $ 0.50    $ 0.75
- ----------                ---------         ------     --------      ----------  ----------    --------       -------   -------
<S>                      <C>                 <C>       <C>             <C>          <C>        <C>             <C>       <C>
Mark H. Shipps            Ohio               10,000                                                              --        --
Anthony A. Alexander      Ohio                 --                                                                --        --
James Helmick             Ohio                 --                                                               3,190      --
Raymond J. Nardelli       Ohio                 --                                                                --        --
Elizabeth L. Williams     Ohio                 --                                                                --        --
Michael C. Maurer         Ohio                 --                                                                --        --
Stevan J. Ingwersen       Iowa                 --                                                                --        --
Randy Masukawa            California           --                                                                --        --
Louis Kalani              Ohio                 --                                                                --        --
Stephen Lingafelter       Ohio                 --                                                                --        --
Harry Zernechel           Ohio                 --                                                                --        --
Randall W. Chapman        Ohio                 --                                                                --       3,190
Michael Rogozinski        Ohio                 --                                                                --        --
Dennis Hinderer           Ohio                 --                                                                --        --
Don Johnson               Ohio                 --                                                                --        --
Don Hershman              Pennsylvania         --                                                                --        --
Gordon Neufeld            Ohio                 --                                                                --        --
Aman Green                Ohio                 --                                                                --        --
Barry Rogers              New York             --                                                                --        --

DIRECTORS

John Pacey                California           --          --          --            --          --              --        --
Gene Ostrow               Massachusetts        --          --          --            --          --              --        --
INVESTMENT FUNDS

Summit Ventures II, L.P.  Massachusetts .      --       364,507      99,267        99,267     210,151            --        --
Summit Ventures, L.P.     Massachusetts        --       364,507      99,267        99,267     210,151            --        --
Environmental Venture
Fund                      Illinois             --       302,225      82,304        82,304     174,296            --        --
SV Eurofund C.V           Massachusetts        --       243,005      66,179       66 ,179     139,912            --        --
McDonald & Co.            Ohio                 --        75,556      20,576        20,576        --              --        --
Summit Investors, L.P.    Massachusetts                  10,200       2,777         2,777       6,231            --        --

INVESTORS

M.B. Lingafelter          Ohio               42,000        --          --            --          --              --        --
Seeley, Savidge & Aussem  Ohio               27,000        --          --            --          --              --        --
G. Roebuck                Ohio                1,000        --          --            --          --              --        --


TOTAL                                        80,000   1,360,000     370,370       370,370     740,741           3,190    3,190
                                             ======   =========     =======       =======     =======           =====    =====
</TABLE>



                                       59
<PAGE>

<TABLE>
<CAPTION>
EXHIBIT A. (cont'd)
Schedule of Selling Stakeholders Receiving Cash



                                                    Gross Proceeds                        Total Compensation
                                                    by Security Type                            in Cash
                                              ----------------------------            ---------------------------
                          State of               Common or
MANAGEMENT                Residence              Preferred       Options               Gross     Net of Expenses
- ----------                ---------              ---------       -------                -----    ---------------
<S>                       <C>                       <C>            <C>                   <C>           <C>
Mark H. Shipps            Ohio                     $0.00          $0.00                 $0.00         $0.00
Anthony A. Alexander      Ohio                       -              -                     -             -
James Helmick             Ohio                       -              -                     -             -
Raymond J. Nardelli       Ohio                       -              -                     -             -
Elizabeth L. Williams     Ohio                       -              -                     -             -
Michael C. Maurer         Ohio                       -              -                     -             -
Stevan J. Ingwersen       Iowa                       -              -                     -             -
Randy Masukawa            California                 -              -                     -             -
Louis Kalani              Ohio                       -              -                     -             -
Stephen Lingafelter       Ohio                       -              -                     -             -
Harry Zernechel           Ohio                       -              -                     -             -
Randall W. Chapman        Ohio                       -              -                     -             -
Michael Rogozinski        Ohio                       -              -                     -             -
Dennis Hinderer           Ohio                       -              -                     -             -
Don Johnson               Ohio                       -              -                     -             -
Don Hershman              Pennsylvania               -              -                     -             -
Gordon Neufeld            Ohio                       -              -                     -             -
Aman Green                Ohio                       -              -                     -             -
Barry Rogers              New York                   -              -                     -             -
                                                   $0.00          $0.00                 $0.00         $0.00
DIRECTORS

John Pacey                California               $0.00          $0.00                 $0.00         $0.00
Gene Ostrow               Massachusetts              -              -                     -             -
                                                   $0.00          $0.00                 $0.00         $0.00
INVESTMENT FUNDS

Summit Ventures II, L.P.  Massachusetts            $0.00          $0.00                 $0.00         $0.00
Summit Ventures, L.P.     Massachusetts              -              -                     -             -
Environmental Venture
Fund                      Illinois                   -              -                     -             -
SV Eurofund C.V.          Massachusetts              -              -                     -             -
McDonald & Co.            Ohio                       -              -                     -             -
Summit Investors, L.P.    Massachusetts              -              -                     -             -
                                                   $0.00          $0.00                 $0.00         $0.00
INVESTORS

M.B. Lingafelter          Ohio                     $0.00          $0.00                 $0.00         $0.00
Seeley, Savidge & Aussem  Ohio                       -              -                     -             -
G. Roebuck                Ohio                       -              -                     -             -
                                                   $0.00          $0.00                 $0.00         $0.00

TOTAL                                              $0.00          $0.00                 $0.00         $0.00
                                                   =====          =====                 =====         =====
</TABLE>


                                       60
<PAGE>

<TABLE>
<CAPTION>
EXHIBIT B.
Schedule of Management Stakeholders Receiving Note

                                                                                         Gross Proceeds        Total Compensation
                                                                                        by Security Type             in Note
                                                                                       -------------------     -------------------
                                                     Preferred
                         State of                      Stock       Options     Options                                   Net of
MANAGEMENT               Residence        Common    All Series      $           $0.75   Common    Options      Gross     Expenses
- ----------               ---------        ------    ----------     -------     -------                         -----     --------
<S>                       <C>              <C>       <C>            <C>          <C>      <C>       <C>         <C>        <C>
Mark H. Shipps           Ohio                 -                        -          -      $0.00     $0.00       $0.00      $0.00
Anthony A. Alexander     Ohio            20,000                        -          -        -          -          -          -
James Helmick            Ohio                 -                     (3,190)       -        -          -          -          -
Raymond J. Nardelli      Ohio            28,000                        -          -        -          -          -          -
Elizabeth L. Williams    Ohio                 -                        -          -        -          -          -          -
Michael C. Maurer        Ohio                 -                        -          -        -          -          -          -
Stevan J. Ingwersen      Iowa                 -                        -          -        -          -          -          -
Randy Masukawa           California           -                        -          -        -          -          -          -
Louis Kalani             Ohio                 -                        -          -        -          -          -          -
Stephen Lingafelter      Ohio            39,000                        -          -        -          -          -          -
Harry Zernechel          Ohio                 -                        -          -        -          -          -          -
Randall W. Chapman       Ohio                 -                        -       (3,190)     -          -          -          -
Michael Rogozinski       Ohio                 -                        -          -        -          -          -          -
Dennis Hinderer          Ohio                 -                        -          -        -          -          -          -
Don Johnson              Ohio                 -                        -          -        -          -          -          -
Don Hershman             Pennsylvania         -                        -          -        -          -          -          -
Gordon Neufeld           Ohio                 -                        -          -        -          -          -          -
Aman Green               Ohio                 -                        -          -        -          -          -          -
Barry Rogers             New York             -                        -          -        -          -          -          -
                                                                                         $0.00     $0.00       $0.00      $0.00
DIRECTORS

John Pacey               California           -             -          -          -      $0.00     $0.00       $0.00      $0.00
Gene Ostrow              Massachusetts        -             -          -          -        -          -          -          -
                                                                                         $0.00     $0.00       $0.00      $0.00
INVESTMENT FUNDS

Summit Ventures II, L.P. Massachusetts        -             -          -          -      $0.00     $0.00       $0.00      $0.00
Summit Ventures, L.P.    Massachusetts        -             -          -          -        -          -          -          -
Environmental Venture
Fund                     Illinois             -             -          -          -        -          -          -          -
SV Eurofund C.V.         Massachusetts        -             -          -          -        -          -          -          -
McDonald & Co.           Ohio                 -             -          -          -        -          -          -          -
Summit Investors, L.P.   Massachusetts                      -          -          -        -          -          -          -
                                                                                         $0.00     $0.00       $0.00      $0.00
INVESTORS

M.B. Lingafelter         Ohio                 -             -          -          -      $0.00     $0.00       $0.00      $0.00
Seeley, Savidge & Aussem Ohio                 -             -          -          -        -          -          -          -
G. Roebuck               Ohio                 -             -          -          -        -          -          -          -
                                                                                         $0.00     $0.00       $0.00      $0.00

TOTAL                                      87,000                   (3,190)    (3,190)   $0.00     $0.00       $0.00      $0.00
                                           ======         =====     =======    ======    =====     =====       =====      =====
</TABLE>


                                       61
<PAGE>






                     EXHIBIT E-1 to Stock Purchase Agreement

                                CONVERTIBLE NOTE


Cleveland, Ohio                                                  $1,022,047.75
February 29, 1996


          FOR VALUE  RECEIVED,  Organic  Waste  Technologies,  Inc.,  a Delaware
corporation (hereinafter called the "Borrower"),  hereby promises to pay to Mark
H. Shipps, or his respective registered assigns (the "Holder") or order, the sum
of One Million Twenty-Two  Thousand  Forty-Seven  Dollars and Seventy-Five Cents
($1,022,047.75) (the "Principal"),  on March 1, 2001, and to pay interest on the
unpaid principal balance hereof at the rate of eight percent (8%) per annum from
the date hereof until the same becomes due and payable.  Interest shall commence
accruing on the date hereof and shall be payable annually on each anniversary of
the date hereof,  beginning on the first anniversary  hereof,  with all interest
remaining  unpaid at maturity due at such time.  All  payments of Principal  and
interest  shall be made in lawful  money of the United  States of  America.  All
payments shall be made at the address of the Holder, as set forth in Section 6.2
hereof or as the Holder shall  hereafter  give to the Borrower by written notice
made in accordance with the provisions of this Note.

          The following terms shall apply to this Note:


                                    ARTICLE I

                         PROHIBITION AGAINST PREPAYMENT

           1.1    Borrower shall have no right to prepay this Note at any time.


                                   ARTICLE II

                        CONVERSION INTO BORROWER'S STOCK

          In the event that Borrower  consummates  a sale of  Borrower's  common
stock  (the "OWT  Common  Stock") to the public  pursuant  to a firm  commitment
underwritten  public  offering  in an  amount of at least  Ten  Million  Dollars
($10,000,000)  or any  lesser  amount as may be  approved  in writing by Mark H.
Shipps,  (the "Initial Public  Offering") at any time prior to the expiration of
the term hereof,  upon the  consummation  of the Initial  Public  Offering,  the
Principal  shall be  automatically  converted  into shares of OWT Common  Stock,
pursuant to the terms of this Article II. In such event,  any accrued but unpaid
interest shall be immediately due and payable.

                                       62
<PAGE>

         2.1  Conversion  Price.  The number of shares of OWT Common  Stock into
which the  Principal  shall be converted  shall be the amount of the  Principal,
divided by the OWT Conversion Price. The OWT Conversion Price shall initially be
Four  Dollars and Eighty  Cents  ($4.80),  and shall be adjusted as set forth in
Section 2.2 hereof.

         2.2      Adjustments to OWT Conversion Price.  The OWT Conversion
Price shall be adjusted as set forth in this section 2.2.

                  (a) Subdivisions. In case Borrower shall at any time subdivide
the outstanding  shares of OWT Common Stock,  the OWT Conversion Price in effect
immediately prior to such subdivision shall be proportionately decreased, and in
case the Company shall at any time combine the outstanding  shares of OWT Common
Stock, the OWT Conversion Price in effect  immediately prior to such combination
shall be  proportionately  increased,  effective at the close of business on the
date of such subdivision or combination, as the case may be.

                  (b) Stock Dividends.  In case Borrower shall at any time pay a
dividend with respect to OWT Common Stock payable in OWT Common Stock,  then the
OWT  Conversion  Price  in  effect  immediately  prior  to the  record  date for
distribution  of such  dividend  shall be adjusted to that price  determined  by
multiplying the OWT Conversion Price in effect  immediately prior to such record
date by a  fraction  (i) the  numerator  of which  shall be the total  number of
shares of OWT Common Stock  outstanding  immediately  prior to such dividend and
(ii) the  denominator of which shall be the total number of shares of OWT Common
Stock outstanding immediately after such dividend.

                  (c)    Reclassification    or   Merger.   In   case   of   any
reclassification,  change or conversion of the OWT Common Stock (other than as a
result of a subdivision or combination  described  above and other than upon any
Acceleration Event, as defined below), Borrower shall have the right to receive,
upon  exchange of this Note  (which may occur at the option of the Holder  only)
the kind and amount of shares of stock,  other  securities,  money and  property
receivable upon such  reclassification,  change or conversion by a holder of the
number of  shares of OWT  Common  Stock  into  which  this  Note  could  then be
exchanged  in the event  that an  Initial  Public  Offering  had  occurred.  The
provisions  of this  subparagraph  (iii)  shall  similarly  apply to  successive
reclassifications, changes, and conversions.

                  (d)  Anti-Dilution  Protection.  In the  event  that  Borrower
issues and sells shares of OWT Common Stock to EMCON or affiliated  companies of
EMCON,  at a price per share that is less than the OWT Conversion  Price then in
effect,  then the OWT Conversion Price shall be adjusted to equal such per share
price.

         2.3  Participation  in  Initial  Public  Offering.  In the  event  that
Borrower  undertakes an Initial Public  Offering or any other public  registered
underwritten  offering  pursuant to the  Securities Act of 1933, as amended (the
"Act"),  Holder  may, at his  option,  sell the shares of OWT Common  Stock into
which  this Note may be  converted  pursuant  to Article II hereof on a pro rata
basis with EMCON and the other holders of OWT Common Stock participating in such
offering, subject to the approval of the managing underwriters for such


                                       63
<PAGE>

offering.  This right shall expire at such time as Holder may sell all shares of
OWT Common Stock into which this Note may be converted in any three month period
pursuant  to  Rule  144  under  the  Act.  The  procedures  and  terms  of  such
registration  rights  shall  be as set  forth  in  Sections  4 to 7 of the  Note
Agreement (as defined below).


                                   ARTICLE III

                                     OFFSET

         3.1      Offset.

                  (a) The  Holder  acknowledges  that this Note is being made by
the Borrower  pursuant to that certain  Stock  Purchase  Agreement,  dated as of
January ____, 1996, by and among the Borrower,  EMCON, a California  corporation
("EMCON"),  and the holders of the outstanding capital stock of the Borrower and
outstanding  options to  purchase  OWT Common  Stock  ("OWT  Options")  and that
certain  Note  Agreement,  dated as of the date hereof,  by and among  Borrower,
EMCON and  certain  holders  of OWT  Common  Stock and OWT  Options  (the  "Note
Agreement").  The  Holder  further  acknowledges  that he or she is bound by the
Stock  Purchase  Agreement  and the Note  Agreement,  and that the Principal due
hereunder may be reduced by any amounts due from the Holder to EMCON pursuant to
Section 12.2 of the Stock Purchase Agreement.

                  (b) In addition,  the Principal and interest  hereunder may be
reduced  by any  amount  outstanding  from the  Holder  under  the Loan Note (as
defined in the Note  Agreement)  which the  Holder  then owes to OWT or EMCON at
such time as this Note becomes due and payable.


                                   ARTICLE IV

                                  ACCELERATION

         4.1 Notwithstanding  anything to the contrary herein, in the event that
any of the events set forth in  paragraphs  (a) through (h) of this  Section 4.1
(each, an  "Acceleration  Event") shall occur at any time after the date hereof,
then,  subject  to the  qualification  set forth in  paragraph  (g)  below,  the
Principal  and all  interest  thereon  shall,  at the option of the  Holder,  be
immediately due and payable

                  (a) upon a  consolidation  or merger of EMCON with or into any
other corporation or corporations (other than a wholly-owned subsidiary of EMCON
and other than a merger in which  EMCON is the  surviving  corporation),  or the
sale, transfer or other disposition of all or substantially all of the assets of
EMCON;

                                       64
<PAGE>

                  (b) upon a change in ownership of Fifty Percent (50%) or more,
in a  single  transaction,  of the  stock  of the  Borrower,  other  than  to an
affiliate or affiliates of EMCON which does not materially  alter EMCON's direct
or indirect ownership of Borrower;

                  (c) upon a change in ownership of Fifty Percent (50%) or more,
in a series of two (2) or more  transactions,  of the  outstanding  stock of the
Borrower,  other  than to an  affiliate  or  affiliates  of the  Borrower  and a
substantial diminution in the responsibilities of Mark H. Shipps with respect to
the Borrower in his capacity as an employee of EMCON;

                  (d) (i) upon a change  in  ownership  of  Thirty-Five  Percent
(35%) or more of the stock of EMCON to a single buyer or an affiliated  group of
buyers, resulting in a change in the majority of the board of directors of EMCON
from the board of  directors as it existed  immediately  prior to such change in
ownership, or (ii) upon a change in ownership of Fifty Percent (50%) or more, in
a single transaction, of the stock of EMCON;

                  (e) upon the  liquidation,  dissolution  or  winding up of the
Borrower or the  consolidation  or merger of the Borrower  with and into another
corporation  (other  than a  merger  in  which  the  Borrower  is the  surviving
corporation);

                  (f)  upon  the  occurrence  of any  transaction,  without  the
consent  of Mark  H.  Shipps,  in  which  Twenty  Percent  (20%)  or more of the
outstanding  stock of the Borrower  becomes owned by persons other than EMCON or
an affiliate or affiliates of EMCON;

                  (g) upon the death of Holder or  termination  of the  Holder's
employment by Borrower,  other than a Termination  for Cause.  "Termination  for
Cause" is intended to embrace  intentionally or grossly negligent conduct on the
part of the Holder which is  materially  detrimental  to the  operations  and/or
reputation of the Borrower or EMCON. By way of  illustration  such actions would
include  (but  would  not be  limited  to) a  material  breach  of the  Holder's
obligations  under any  employment  agreement  between the Holder and OWT and/or
conviction of a crime (other than minor  infractions  such as parking or similar
traffic violations),  moral turpitude and revocation by the applicable licensing
authority of professional  licenses (if any) material to the Holder's ability to
perform the Holder's employment  obligations.  Notwithstanding any obligation of
Borrower  to repay  all  outstanding  Principal  and  interest  thereon  upon an


                                       65
<PAGE>

Acceleration  Event,  in the  event of death of the  Holder  or  termination  of
Holder's  employment by Borrower  other than a Termination  for Cause,  Borrower
may, at its option,  repay one half of all amounts due hereunder upon such event
and the remaining  one half of such amounts six (6) months after the  occurrence
of such event (together with interest on such deferred  portion  computed at the
rate of 8% per annum); or

                  (h) upon a fundamental  change in EMCON's current  strategy of
focussing a material  amount of EMCON's  resources  on services  relating to the
design, construction, ownership, operation and maintenance of infrastructure;

                                       66 
<PAGE>
provided,  however, that upon any Acceleration Event, no amount shall be due and
payable  hereunder  in the event  that the Holder  has  exchanged  this Note for
common stock of EMCON, pursuant to the Note Agreement.


                                    ARTICLE V

                                                  EVENTS OF DEFAULT

         If of any of the  following  events  of  default  (each,  an  "Event of
Default") shall occur:

         5.1      Failure to Pay Principal or Interest.  The Borrower or EMCON
fails to pay the Principal or interest when due;

         5.2 Receiver or Trustee. The Borrower or EMCON shall make an assignment
for the benefit of creditors,  or apply for or consent to the  appointment  of a
receiver  or  trustee  for it or for a  substantial  part  of  its  property  or
business, or such a receiver or trustee shall otherwise be appointed;

         5.3      Bankruptcy.  Bankruptcy, insolvency, reorganization or
liquidation proceedings or other proceedings for relief under any bankruptcy law
or any law for relief of debtors  shall be instituted by or against the Borrower
or EMCON;

then upon the  occurrence and during the  continuation  of any Event of Default,
then,  at the option of the Holder,  the  Principal and all interest due thereon
shall be  immediately  due and payable,  and the  Borrower  shall have all other
remedies available at law or equity.


                                   ARTICLE VI

                                  MISCELLANEOUS

         6.1 Failure or Indulgence  Not Waiver.  No failure or delay on the part
of the Holder in the exercise of any power,  right or privilege  hereunder shall
operate as a waiver  thereof,  nor shall any single or partial  exercise  of any
such power,  right or privilege preclude other or further exercise thereof or of
any other right, power or privileges.

         6.2 Notices. All notices,  consents,  waivers, and other communications
under this  Agreement  must be in  writing  and will be deemed to have been duly
given when (a) delivered by hand (with  written  confirmation  of receipt),  (b)
sent by telecopier (with written confirmation of receipt),  provided that a copy
is mailed  within three (3) business  days by registered  mail,  return  receipt
requested, (c) when received by the addressee, if sent by a


                                       67
<PAGE>

nationally  recognized  overnight delivery service (receipt  requested),  or (d)
three (3) business days after being sent by registered or certified mail, return
receipt  requested,  in each case to the  appropriate  addresses and  telecopier
numbers set forth below (or to such other addresses and telecopier  numbers as a
party may designate by notice to the other parties):

     Holder:
                             ------------------------------------
                             ------------------------------------
                             ------------------------------------
                             ------------------------------------
                             ------------------------------------


    Borrower:                 Organic Waste Technologies, Inc.
                              7550 Lucerne Drive, Suite 110
                              Cleveland, Ohio 44130
                              Attn:  President
                              Fax:  (216) 891-8288

         6.3 Amendment Provision.  The term "Note" and all reference thereto, as
used  throughout  this  instrument,  shall mean this  instrument  as  originally
executed,  or  if  later  amended  or  supplemented,   then  as  so  amended  or
supplemented.

         6.4      Governing Law.  This Note shall be governed by the internal
laws of the State of Delaware,  without  regard to the principles of conflict of
laws.

         IN WITNESS  WHEREOF,  Borrower has caused this Note to be signed in its
name by its duly authorized officer as of the ______day of____________ , 1996.


                                ORGANIC WASTE TECHNOLOGIES, INC.


                                  By:    /s/
                                        ----------------------

                                  Name:     Mark Shipps
                                        ----------------------

                                 Title:      President
                                         ---------------------



                                       68
<PAGE>



          Borrower  is  a   wholly-owned   subsidiary  of  EMCON,  a  California
corporation ("EMCON").  To induce the Holder to give and continue to give credit
to Borrower and in consideration  of the extension of such credit,  EMCON hereby
absolutely and unconditionally guarantees prompt payment when due of the amounts
due from Borrower under this Note. EMCON further absolutely and  unconditionally
guarantees the prompt  performance  when due of all the  obligations of Borrower
under the Note.  The  undersigned  undertakes  this  continuing,  absolute,  and
unconditional guaranty of the aforementioned payment and performance by Borrower
notwithstanding  that any portion of the amount due under the Note shall be void
or voidable as between the Borrower and any of its creditors, including, without
limitation,  any bankruptcy trustee of the Borrower. This absolute,  continuing,
unconditional,  and  unrestricted  guaranty  is a guaranty  of payment and not a
guaranty of collection.  Upon  Borrower's  failure to pay the Note promptly when
due, the Holder,  at his sole option,  may proceed  against EMCON to collect the
amount due, with or without  proceeding  against the Borrower.  EMCON waives all
defenses to this guaranty.



                                 EMCON

                                 By:      /s/
                                        --------------------------------

                                 Name:   Eugene M. Herson

                                 Title:    President & Chief Executive Officer

                                 Date:      February 29, 1996

                                       69
<PAGE>


                     EXHIBIT E-2 to Stock Purchase Agreement

                                CONVERTIBLE NOTE

Cleveland, Ohio                                           $__________
February 29, 1996


         FOR VALUE  RECEIVED,  Organic  Waste  Technologies,  Inc.,  a  Delaware
corporation (hereinafter called the "Borrower"), hereby promises to pay to name,
or his or her respective  registered assigns (the "Holder") or order, the sum of
number  Dollars  ($amount)  (the  "Principal"),  on  March 1,  2001,  and to pay
interest on the unpaid  principal  balance  hereof at the rate of eight  percent
(8%) per annum from the date  hereof  until the same  becomes  due and  payable.
Interest  shall  commence  accruing  on the date  hereof  and  shall be  payable
annually  on  each  anniversary  of the  date  hereof,  beginning  on the  first
anniversary  hereof,  with all interest remaining unpaid at maturity due at such
time.  All payments of Principal  and interest  shall be made in lawful money of
the United States of America.  All payments  shall be made at the address of the
Holder, as set forth in Section 6.2 hereof or as the Holder shall hereafter give
to the Borrower by written notice made in accordance with the provisions of this
Note.

         The following terms shall apply to this Note:


                                    ARTICLE I

                         PROHIBITION AGAINST PREPAYMENT

         1.1      Borrower shall have no right to prepay this Note at any time.


                                   ARTICLE II

                        CONVERSION INTO BORROWER'S STOCK

         In the event that  Borrower  consummates  a sale of  Borrower's  common
stock  (the "OWT  Common  Stock") to the public  pursuant  to a firm  commitment
underwritten  public  offering  in an  amount of at least  Ten  Million  Dollars
($10,000,000)  or any  lesser  amount as may be  approved  in writing by Mark H.
Shipps,  (the "Initial Public  Offering") at any time prior to the expiration of
the term hereof,  upon the  consummation  of the Initial  Public  Offering,  the
Principal  shall be  automatically  converted  into shares of OWT Common  Stock,
pursuant to the terms of this Article II. In such event,  any accrued but unpaid
interest shall be immediately due and payable.

                                       70
<PAGE>

         2.1  Conversion  Price.  The number of shares of OWT Common  Stock into
which the  Principal  shall be converted  shall be the amount of the  Principal,
divided by the OWT Conversion Price. The OWT Conversion Price shall initially be
Four  Dollars and Eighty  Cents  ($4.80),  and shall be adjusted as set forth in
Section 2.2 hereof.

          2.2  Adjustments to OWT  Conversion  Price.  The OWT Conversion  Price
shall be adjusted as set forth in this section 2.2.

                  (a) Subdivisions. In case Borrower shall at any time subdivide
the outstanding  shares of OWT Common Stock,  the OWT Conversion Price in effect
immediately prior to such subdivision shall be proportionately decreased, and in
case the Company shall at any time combine the outstanding  shares of OWT Common
Stock, the OWT Conversion Price in effect  immediately prior to such combination
shall be  proportionately  increased,  effective at the close of business on the
date of such subdivision or combination, as the case may be.

                  (b) Stock Dividends.  In case Borrower shall at any time pay a
dividend with respect to OWT Common Stock payable in OWT Common Stock,  then the
OWT  Conversion  Price  in  effect  immediately  prior  to the  record  date for
distribution  of such  dividend  shall be adjusted to that price  determined  by
multiplying the OWT Conversion Price in effect  immediately prior to such record
date by a  fraction  (i) the  numerator  of which  shall be the total  number of
shares of OWT Common Stock  outstanding  immediately  prior to such dividend and
(ii) the  denominator of which shall be the total number of shares of OWT Common
Stock outstanding immediately after such dividend.

                  (c)    Reclassification    or   Merger.   In   case   of   any
reclassification,  change or conversion of the OWT Common Stock (other than as a
result of a subdivision or combination  described  above and other than upon any
Acceleration Event, as defined below), Borrower shall have the right to receive,
upon  exchange of this Note  (which may occur at the option of the Holder  only)
the kind and amount of shares of stock,  other  securities,  money and  property
receivable upon such  reclassification,  change or conversion by a holder of the
number of  shares of OWT  Common  Stock  into  which  this  Note  could  then be
exchanged  in the event  that an  Initial  Public  Offering  had  occurred.  The
provisions  of this  subparagraph  (iii)  shall  similarly  apply to  successive
reclassifications, changes, and conversions.

                  (d)  Anti-Dilution  Protection.  In the  event  that  Borrower
issues and sells shares of OWT Common Stock to EMCON or affiliated  companies of
EMCON,  at a price per share that is less than the OWT Conversion  Price then in
effect,  then the OWT Conversion Price shall be adjusted to equal such per share
price.

         2.3  Participation  in  Initial  Public  Offering.  In the  event  that
Borrower  undertakes an Initial Public  Offering or any other public  registered
underwritten  offering  pursuant to the  Securities Act of 1933, as amended (the
"Act"),  Holder  may, at his  option,  sell the shares of OWT Common  Stock into
which  this Note may be  converted  pursuant  to Article II hereof on a pro rata
basis with EMCON and the other holders of OWT Common Stock participating in such
offering,  subject  to  the  approval  of the  managing  underwriters  for  such


                                       71
<PAGE>

offering.  This right shall expire at such time as Holder may sell all shares of
OWT Common Stock into which this Note may be converted in any three month period
pursuant  to  Rule  144  under  the  Act.  The  procedures  and  terms  of  such
registration  rights  shall  be as set  forth  in  Sections  4 to 7 of the  Note
Agreement (as defined below).


                                   ARTICLE III

                                     OFFSET

         3.1      Offset.

                  (a) The  Holder  acknowledges  that this Note is being made by
the Borrower  pursuant to that certain  Stock  Purchase  Agreement,  dated as of
January , 1996,  by and among the  Borrower,  EMCON,  a  California  corporation
("EMCON"),  and the holders of the outstanding capital stock of the Borrower and
outstanding  options to  purchase  OWT Common  Stock  ("OWT  Options")  and that
certain  Note  Agreement,  dated as of the date hereof,  by and among  Borrower,
EMCON and  certain  holders  of OWT  Common  Stock and OWT  Options  (the  "Note
Agreement").  The  Holder  further  acknowledges  that he or she is bound by the
Stock  Purchase  Agreement  and the Note  Agreement,  and that the Principal due
hereunder may be reduced by any amounts due from the Holder to EMCON pursuant to
Section 12.2 of the Stock Purchase Agreement.

                  (b) In addition,  the Principal and interest  hereunder may be
reduced  by any  amount  outstanding  from the  Holder  under  the Loan Note (as
defined in the Note  Agreement)  which the  Holder  then owes to OWT or EMCON at
such time as this Note becomes due and payable.


                                   ARTICLE IV

                                  ACCELERATION

         4.1 Notwithstanding  anything to the contrary herein, in the event that
any of the events set forth in  paragraphs  (a) through (h) of this  Section 4.1
(each, an  "Acceleration  Event") shall occur at any time after the date hereof,
then the Principal and all interest  thereon shall, at the option of the Holder,
be immediately due and payable

                  (a) upon a  consolidation  or merger of EMCON with or into any
other corporation or corporations (other than a wholly-owned subsidiary of EMCON
and other than a merger in which  EMCON is the  surviving  corporation),  or the
sale, transfer or other disposition of all or substantially all of the assets of
EMCON;

                                       72
<PAGE>

                  (b) upon a change in ownership of Fifty Percent (50%) or more,
in a  single  transaction,  of the  stock  of the  Borrower,  other  than  to an
affiliate or affiliates of EMCON which does not materially  alter EMCON's direct
or indirect ownership of Borrower;

                  (c) upon a change in ownership of Fifty Percent (50%) or more,
in a series of two (2) or more  transactions,  of the  outstanding  stock of the
Borrower,  other  than to an  affiliate  or  affiliates  of the  Borrower  and a
substantial diminution in the responsibilities of Mark H. Shipps with respect to
the Borrower in his capacity as an employee of EMCON;

                  (d) (i) upon a change  in  ownership  of  Thirty-Five  Percent
(35%) or more of the stock of EMCON to a single buyer or an affiliated  group of
buyers, resulting in a change in the majority of the board of directors of EMCON
from the board of  directors as it existed  immediately  prior to such change in
ownership, or (ii) upon a change in ownership of Fifty Percent (50%) or more, in
a single transaction, of the stock of EMCON;

                  (e) upon the  liquidation,  dissolution  or  winding up of the
Borrower or the  consolidation  or merger of the Borrower  with and into another
corporation  (other  than a  merger  in  which  the  Borrower  is the  surviving
corporation);

                  (f)  upon  the  occurrence  of any  transaction,  without  the
consent  of Mark  H.  Shipps,  in  which  Twenty  Percent  (20%)  or more of the
outstanding  stock of the Borrower  becomes owned by persons other than EMCON or
an affiliate or affiliates of EMCON;

                  (g)  upon  the  death  of the  Holder  or  termination  of the
Holder's   employment  by  Borrower,   other  than  a  Termination   for  Cause.
"Termination  for  Cause"  is  intended  to  embrace  intentionally  or  grossly
negligent  conduct on the part of the Holder which is materially  detrimental to
the  operations   and/or  reputation  of  the  Borrower  or  EMCON.  By  way  of
illustration such actions would include (but would not be limited to) a material
breach of the Holder's  obligations  under any employment  agreement between the
Holder and OWT and/or  conviction of a crime (other than minor  infractions such
as parking or similar traffic violations), moral turpitude and revocation by the
applicable licensing authority of professional licenses (if any) material to the
Holder's ability to perform the Holder's employment obligations; or

                  (h) upon a fundamental  change in EMCON's current  strategy of
focussing a material  amount of EMCON's  resources  on services  relating to the
design, construction, ownership, operation and maintenance of infrastructure;


provided,  however, that upon any Acceleration Event, no amount shall be due and
payable  hereunder  in the event  that the Holder  has  exchanged  this Note for
common stock of EMCON, pursuant to the Note Agreement.


                                       73
<PAGE>

                                    ARTICLE V

                                EVENTS OF DEFAULT

          If of any of the  following  events  of  default  (each,  an "Event of
Default") shall occur:

          5.1 Failure to Pay Principal or Interest.  The Borrower or EMCON fails
to pay the Principal or interest when due;

         5.2 Receiver or Trustee. The Borrower or EMCON shall make an assignment
for the benefit of creditors,  or apply for or consent to the  appointment  of a
receiver  or  trustee  for it or for a  substantial  part  of  its  property  or
business, or such a receiver or trustee shall otherwise be appointed;

          5.3 Bankruptcy. Bankruptcy, insolvency,  reorganization or liquidation
proceedings or other  proceedings for relief under any bankruptcy law or any law
for relief of debtors shall be instituted by or against the Borrower or EMCON;

          then upon the occurrence and during the  continuation  of any Event of
Default,  then, at the option of the Holder,  the Principal and all interest due
thereon shall be  immediately  due and payable,  and the Borrower shall have all
other remedies available at law or equity.


                                   ARTICLE VI

                                  MISCELLANEOUS

          6.1 Failure or Indulgence Not Waiver.  No failure or delay on the part
of the Holder in the exercise of any power,  right or privilege  hereunder shall
operate as a waiver  thereof,  nor shall any single or partial  exercise  of any
such power,  right or privilege preclude other or further exercise thereof or of
any other right, power or privileges.

          6.2 Notices. All notices, consents,  waivers, and other communications
under this  Agreement  must be in  writing  and will be deemed to have been duly
given when (a) delivered by hand (with  written  confirmation  of receipt),  (b)
sent by telecopier (with written confirmation of receipt),  provided that a copy
is mailed  within three (3) business  days by registered  mail,  return  receipt
requested,  (c)  when  received  by  the  addressee,  if  sent  by a  nationally
recognized  overnight  delivery  service (receipt  requested),  or (d) three (3)
business days after being sent by registered or certified  mail,  return receipt
requested,  in each case to the appropriate addresses and telecopier numbers set
forth below (or to such other  addresses and  telecopier  numbers as a party may
designate by notice to the other parties):

                                       74
<PAGE>

                  Holder:
                            --------------------------
                            --------------------------
                            --------------------------
                            --------------------------
                            --------------------------

                  Borrower:             Organic Waste Technologies, Inc.
                                        7550 Lucerne Drive, Suite 110
                                        Cleveland, Ohio 44130
                                        Attn:  President
                                        Fax:  (216) 891-8288

          6.3 Amendment Provision. The term "Note" and all reference thereto, as
used  throughout  this  instrument,  shall mean this  instrument  as  originally
executed,  or  if  later  amended  or  supplemented,   then  as  so  amended  or
supplemented.

          6.4 Governing Law. This Note shall be governed by the internal laws of
the State of Delaware, without regard to the principles of conflict of laws.

          IN WITNESS WHEREOF,  Borrower has caused this Note to be signed in its
name by its duly authorized officer as of the 29th day of February, 1996.


                      ORGANIC WASTE TECHNOLOGIES, INC.


                      By:      /s/
                      ------------------------------------------

                      Name:     Mark Shipps

                      Title:    President




                                       75
<PAGE>


          Borrower  is  a   wholly-owned   subsidiary  of  EMCON,  a  California
corporation ("EMCON").  To induce the Holder to give and continue to give credit
to Borrower and in consideration  of the extension of such credit,  EMCON hereby
absolutely and unconditionally guarantees prompt payment when due of the amounts
due from Borrower under this Note. EMCON further absolutely and  unconditionally
guarantees the prompt  performance  when due of all the  obligations of Borrower
under the Note.  The  undersigned  undertakes  this  continuing,  absolute,  and
unconditional guaranty of the aforementioned payment and performance by Borrower
notwithstanding  that any portion of the amount due under the Note shall be void
or voidable as between the Borrower and any of its creditors, including, without
limitation,  any bankruptcy trustee of the Borrower. This absolute,  continuing,
unconditional,  and  unrestricted  guaranty  is a guaranty  of payment and not a
guaranty of collection.  Upon  Borrower's  failure to pay the Note promptly when
due, the Holder,  at his sole option,  may proceed  against EMCON to collect the
amount due, with or without  proceeding  against the Borrower.  EMCON waives all
defenses to this guaranty.



                             EMCON

                             By:      /s/
                             ------------------------
                             Name:  Eugene M. Herson

                             Title: President & Chief Executive Officer

                             Date: February 29, 1996



                                       76
<PAGE>

                                  EXHIBIT 10.1

                                 NOTE AGREEMENT


         THIS  AGREEMENT  is made as of the 29th day of February,  1996,  by and
among EMCON, a California  corporation  ("EMCON"),  Organic Waste  Technologies,
Inc., a Delaware  corporation,  ("OWT"),  and the undersigned  holders of common
stock  ("Common  Shares") of OWT and  holders of options to purchase  the common
stock of OWT ("Options") listed on the signature pages hereto (collectively, the
holders thereof being the "Management Stakeholders").

         WHEREAS, the Management  Stakeholders are parties to that certain Stock
Purchase  Agreement dated January 30, 1996,  among the Management  Stakeholders,
EMCON, OWT and certain other holders of common and preferred stock of OWT and of
options to purchase common stock of OWT (the "Stock Purchase Agreement");

         WHEREAS,  pursuant  to the Stock  Purchase  Agreement  each  Management
Stakeholder  has agreed to exchange the Common Shares and/or Options held by him
at the  closing  of the sale and  purchase  contemplated  by the Stock  Purchase
Agreement (the "Closing") for a convertible note made by OWT (collectively,  the
"Notes");

         WHEREAS,  in connection  therewith,  the parties hereto desire to enter
into additional agreements regarding the Notes;

         WHEREAS,  EMCON desires to lend each  Management  Stakeholder an amount
equal to the  additional  federal,  state  and  local  income  taxes  (the  "Tax
Liability")  required  to be  paid by him as a  result  of the  exchange  of the
Options and Common Shares owned by him for a Note (the "Loan Amount").

         NOW,  THEREFORE,  in  consideration of the foregoing and the agreements
set forth below, the parties agree with each other as follows:

         1. Loan.  Upon the date on which  amounts are  withheld by OWT or EMCON
for  each  Management  Stakeholder's  Tax  Liability  or paid  directly  by such
Management  Stakeholder to the appropriate taxing authority,  EMCON shall pay to
such  Management  Stakeholder  an  amount  equal  to  such  withholding  or  Tax
Liability,  by cashier's check or wire transfer, and such Management Stakeholder
shall execute a note in the principal amount of the Loan Amount,  in the form of
Exhibit A hereto (the "Loan Note").


         2.  (a)  Exchange  Right.  In the  event  that  the  Note  has not been
converted into OWT Common Stock in accordance  with its terms prior to the fifth
anniversary  of the date  hereof,  each  Management  Stakeholder  shall have the
right,  for a period of ninety (90) days prior to the fifth  anniversary  of the
date  hereof,   to  exchange  the  Note  payable  to  him  for  fully  paid  and
nonassessable  shares of Common  Stock,  no par  value,  of EMCON as such  stock
exists on the date of  issuance  of the Note  payable  to him,  or any shares of


                                       77
<PAGE>

capital  stock of EMCON  into which such  stock  shall  hereafter  be changed or
reclassified  (the "EMCON  Common  Stock") at the exchange  price  determined as
provided  herein (the "EMCON Exchange  Price").  Upon the surrender of the Note,
accompanied  by a Notice of Exchange of  Convertible  Note in the form  attached
hereto as Exhibit B,  properly  completed  and duly  executed by the  Management
Stakeholder (an "Exchange Notice"), EMCON shall issue and deliver to or upon the
order of the Management  Stakeholder that number of shares of EMCON Common Stock
for  which  the  Principal  (as  defined  in the Note)  shall be  exchanged,  as
determined in accordance  herewith.  Upon such exchange,  any accrued but unpaid
interest on the Notes shall be immediately due and payable.

         The number of shares of EMCON Common  Stock to be issued upon  exchange
of each Note shall be determined by dividing the Principal  thereof by the EMCON
Exchange  Price in effect on the date the Exchange  Notice is delivered to EMCON
by the Management Stakeholder.

                  (b)      Exchange Price.  The EMCON Exchange Price shall 
initially be $6.50.

                           (i)      Subdivisions.  In case EMCON shall at any 
time subdivide the outstanding  shares of EMCON Common Stock, the EMCON Exchange
Price in effect  immediately prior to such subdivision shall be  proportionately
decreased,  and in case the Company  shall at any time  combine the  outstanding
shares of EMCON Common Stock, the Exchange Price in effect  immediately prior to
such combination shall be proportionately  increased,  effective at the close of
business on the date of such subdivision or combination, as the case may be.

                           (ii)     Stock Dividends.  In case EMCON shall at 
any time pay a dividend  with  respect to EMCON  Common  Stock  payable in EMCON
Common Stock,  then the EMCON Exchange Price in effect  immediately prior to the
record date for  distribution  of such dividend  shall be adjusted to that price
determined by multiplying the EMCON Exchange Price in effect  immediately  prior
to such record date by a fraction (i) the  numerator of which shall be the total
number of shares of Common Stock outstanding  immediately prior to such dividend
and (ii) the  denominator  of which shall be the total number of shares of EMCON
Common Stock outstanding immediately after such dividend.

                           (iii)    Reclassification or Merger.  In case of any
reclassification,  change or conversion of the EMCON Common Stock (other than as
a result of a subdivision or combination described above and other than upon any
Acceleration  Event, as defined below),  each Management  Stakeholder shall have
the right to receive, upon exchange of the Note owned by him the kind and amount
of shares of stock,  other securities,  money and property  receivable upon such
reclassification,  change or  conversion  by a holder of the number of shares of
EMCON Common Stock into which his Note could then be exchanged.  The  provisions
of   this    subparagraph    (iii)   shall   similarly   apply   to   successive
reclassifications, changes, and conversions.

                                       78
<PAGE>

                  (c) Authorized Shares.  EMCON covenants that during the period
the exchange  right set forth in this Section 2 exists,  EMCON will reserve from
the authorized and unissued EMCON Common Stock a sufficient  number of shares to
provide for the  issuance of EMCON  Common  Stock upon the full  exchange of the
Notes. EMCON represents that upon issuance, such shares will be duly and validly
issued, fully paid and non-assessable.

                  (d) Method of Exchange.  Except as  otherwise  provided in the
Note or  agreed  by the  Management  Stakeholder,  the  Note  held by him may be
exchanged by the  Management  Stakeholder in whole by (i) submitting to EMCON an
Exchange  Notice  and (ii)  surrendering  the Note held by him at the  principal
office of EMCON.

                  (e)  Restrictions  Concerning the Shares.  The shares of EMCON
Common Stock to be held by Management  Stakeholders  pursuant to the exercise of
the exchange rights set forth in Section 2 may not be sold or transferred unless
either (i) such shares first shall have been registered under the Securities Act
of 1933 (the "Act") and  applicable  state  securities  laws or (ii) EMCON shall
have been  furnished  with an opinion of legal  counsel to the effect  that such
sale or transfer is exempt from the registration requirements of the Act and all
applicable  state  securities  laws. Each certificate for shares of EMCON Common
Stock to be held by the Management Stakeholders that have not been so registered
and that have not been sold pursuant to an exemption that permits removal of the
legend, shall bear a legend substantially in the following form, as appropriate:

               THE  SECURITIES  REPRESENTED  BY THIS  CERTIFICATE
               HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT
               OF 1933,  AS  AMENDED.  THE  SECURITIES  HAVE BEEN
               ACQUIRED  FOR  INVESTMENT  AND  MAY  NOT BE  SOLD,
               TRANSFERRED  OR  ASSIGNED  IN  THE  ABSENCE  OF AN
               EFFECTIVE    REGISTRATION    STATEMENT   FOR   THE
               SECURITIES  UNDER THE  SECURITIES  ACT OF 1933, AS
               AMENDED,   OR   AN   OPINION   OF   COUNSEL   THAT
               REGISTRATION IS NOT REQUIRED UNDER SAID ACT.

Upon the request a  Management  Stakeholder,  EMCON shall  remove the  foregoing
legend from the  certificate  representing  the EMCON  Common Stock held by such
Management  Stakeholder upon exercise of the exchange rights pursuant to Section
2 or issue to such Management Stakeholder a new certificate therefor free of any
transfer legend, if, with such request,  EMCON shall have received either (i) an
opinion of counsel to the effect that any such  legend may be removed  from such
certificate, or (ii) if the present paragraph (k) of Rule 144 or a substantially
similar successor rule remains in force and effect, satisfactory representations
from the Management  Stakeholder  that such Management  Stakeholder is not then,
and has not been during the preceding  three (3) months,  an affiliate of EMCON,
and that a period of at least three (3) years has elapsed since the later of the
date the securities  were acquired (as determined  under Rule 144) from EMCON or
an affiliate of EMCON.

                  (f) Acceleration of Exchange Rights.  Notwithstanding anything
to the contrary herein,  in the event that any of the following events set forth


                                       79
<PAGE>

in  paragraphs  (i) through (v) of this  Section  2(f) (each,  an  "Acceleration
Event") shall occur,  then the exchange  rights set forth in Section 2(a) shall,
at the option of each Management Stakeholder, be immediately exercisable:

                           (i)      by any Management Stakeholder upon a 
consolidation  or  merger  of  EMCON  with  or into  any  other  corporation  or
corporations  (other than a  wholly-owned  subsidiary  of EMCON and other than a
merger in which EMCON is the surviving  corporation),  or the sale,  transfer or
other disposition of all or substantially all of the assets of EMCON;

                           (ii)     by any Management Stakeholder after the 
Closing,  upon a change in ownership of Fifty Percent (50%) or more, in a single
transaction,  of the stock of OWT,  other than to an affiliate or  affiliates of
EMCON which does not materially  alter EMCON's  direct or indirect  ownership of
OWT;

                           (iii)    by any Management Stakeholder, upon a 
change in ownership of Fifty  Percent  (50%) or more,  in a series of two (2) or
more transactions  occurring after the Closing, of the outstanding stock of OWT,
other than to an affiliate or affiliates of OWT and a substantial  diminution in
the responsibilities of Mark H. Shipps with respect to OWT in his capacity as an
employee of EMCON;

                           (iv)     (A) upon a change in ownership of Thirty-
Five  Percent  (35%) or more of the  stock  of  EMCON  to a  single  buyer or an
affiliated  group of buyers,  resulting in a change in the majority of the board
of  directors  of EMCON from the board of  directors  as it existed  immediately
prior to such change in  ownership,  or (B) upon a change in  ownership of Fifty
Percent (50%) or more, in a single transaction, of the stock of EMCON;

                           (v)      by any Management Stakeholder, upon the 
liquidation,  dissolution or winding up of OWT or the consolidation or merger of
OWT with and into another  corporation  (other than a merger in which OWT is the
surviving corporation);

                           (vi)     by any Management Stakeholder, upon the 
occurrence of any transaction,  without the consent of Mark H. Shipps,  in which
Twenty  Percent  (20%) or more of the  outstanding  common  stock of OWT becomes
owned by persons other than EMCON or an affiliate or affiliates of EMCON;

                           (vii)    by any Management Stakeholder upon his death
or the  termination of his employment by OWT other than a Termination for Cause,
the  "Termination  for Cause" is  intended to embrace  intentionally  or grossly
negligent  conduct on the part of the Maker which is materially  detrimental  to
the operations  and/or  reputation of OWT or the Holder.  By way of illustration
such actions  would  include (but would not be limited to) a material  breach of
Maker's  obligations  under any employment  agreement  between the Maker and OWT
and/or the Holder,  and/or  conviction of a crime (other than minor  infractions
such as parking or similar traffic  violations),  moral turpitude and revocation
by the applicable licensing authority of professional licenses (if any) material
to the Maker's ability to perform the Maker's employment obligations; or

                                       80
<PAGE>

                           (viii)   by any Management Stakeholder upon a 
fundamental change in EMCON's current strategy of focussing a material amount of
EMCON's resources on services relating to the design,  construction,  ownership,
operation and maintenance of infrastructure.

         3.       Request for Registration.

                  (a)  Upon  the  receipt  by EMCON  of  Exchange  Notices  from
Management  Stakeholders  holding Notes, the aggregate Principal of which may be
exchanged for EMCON Common Stock with an aggregate  value,  based on the closing
price of the EMCON Common Stock on the  principal  market on which such stock is
traded on the date of such Exchange Notices, $1,000,000 or more, EMCON will:

                           (i)      promptly file a registration statement with
the Securities and Exchange  Commission (the  "Commission")  and effect all such
registrations,  qualifications and compliances  (including,  without limitation,
the execution of an undertaking to file post-effective  amendments,  appropriate
qualifications  under the applicable blue sky or other state securities laws and
appropriate  compliance with exemptive  regulations  issued under the Securities
Act of 1933,  as amended  (the  "Securities  Act"),  and any other  governmental
requirements  or  regulations)  as  would  permit  or  facilitate  the  sale and
distribution of all of the EMCON Common Stock issuable upon the full exchange of
the Notes by the Management  Stakeholders (the "Management  Shares");  provided,
however,  that  EMCON  shall  not be  obligated  to  effect  such  registration,
qualification  or  compliance   pursuant  to  this  Section  3(a)(i)(A)  in  any
particular  jurisdiction  in which  EMCON would be required to execute a general
consent to service of process unless EMCON is already subject to service in such
jurisdiction  and except as required by the  Securities  Act and (B) after EMCON
has already effected one such registration, qualification or compliance;

                           (ii)     promptly give notice to all Management 
Stakeholders of the expected registration of the Management Shares;

                           (iii)    use its best efforts to cause such 
registration to be declared effective by the Commission;

                           (iv)     keep such registration statement effective 
for a period of one year or until the Management Stakeholders have completed the
distribution described in the registration statement, whichever first occurs;

                           (v)      prepare and file with the Commission such 
amendments  and  supplements to such  registration  statement and the prospectus
used in  connection  with such  registration  statement  as may be  necessary to
comply with the provisions of the Securities Act with respect to the disposition
of all securities offered by such registration statement;

                           (vi)     furnish such number of prospectuses and 
other documents  incident  thereto,  including any amendment of or supplement to
the  prospectus,  as a Management  Stakeholder  from time to time may reasonably
request;

                                       81
<PAGE>

                           (vii)    notify each Management Stakeholder selling
EMCON Common  Stock  covered by such  registration  statement at any time when a
prospectus relating thereto is required to be delivered under the Securities Act
of the  happening of any event as a result of which the  prospectus  included in
such registration  statement, as then in effect, includes an untrue statement of
a material fact or omits to state a material fact required to be stated  therein
or necessary to make the statements  therein not misleading or incomplete in the
light  of the  circumstances  then  existing,  and at the  request  of any  such
Management  Stakeholder,  prepare and furnish to such  Management  Stakeholder a
reasonable  number  of  copies  of a  supplement  to or  an  amendment  of  such
prospectus  as  may  be  necessary  so  that,  as  thereafter  delivered  to the
purchasers of such shares, such prospectus shall not include an untrue statement
of a  material  fact or omit to state a  material  fact  required  to be  stated
therein or necessary to make the statements therein not misleading or incomplete
in the light of the circumstances then existing;

                           (viii)   cause all such EMCON Common Stock 
registered pursuant hereunder to be listed on each securities exchange,  if any,
on which similar securities issued by EMCON are then listed;

                           (ix)     otherwise use its best efforts to comply 
with all applicable rules and regulations of the Commission; and

                           (x)      in connection with any underwritten 
offering  pursuant to a registration  statement  filed pursuant to this Section,
enter into an underwriting  agreement  reasonably  necessary to effect the offer
and sale of EMCON Common Stock,  provided such underwriting  agreement  contains
customary  underwriting  provisions and provided further that if the underwriter
so requests  the  underwriting  agreement  will contain  customary  contribution
provisions.

                  (b) During the period that EMCON's  registration  statement is
effective  pursuant to this Section 3, the Management  Stakeholders shall comply
with all applicable EMCON policies  regarding  trading of securities by insiders
and members of management, including the observance of "window period" and other
restrictions.

         4.       EMCON Registration.

                  (a) If, at any time after the registration statement described
in Section 3 is no longer  effective,  EMCON shall  determine to register any of
its securities either for its own account or the account of a security holder or
holders, other than a registration relating solely to employee benefit plans, or
a registration  relating solely to a Rule 145 transaction,  or a registration on
any registration form that does not permit secondary sales, EMCON will:

                           (i)      promptly give to each Management Stakeholder
written notice thereof;

                           (ii)     use its best efforts to include in such 
registration  (and  any  related  qualification  under  blue  sky  laws or other


                                       82
<PAGE>

compliance),  except as set forth in Section 4(b) below, and in any underwriting
involved  therein,  all the Management  Shares specified in a written request or
requests, made by any Management Stakeholder and received by EMCON within twenty
(20) days after the written  notice from EMCON  described in clause (i) above is
mailed or delivered by EMCON.  Such written request may specify all or a part of
a Management Stakeholder's Management Shares;

                           (iii)    furnish such number of prospectuses and 
other documents  incident  thereto,  including any amendment of or supplement to
the  prospectus,  as a Management  Stakeholder  from time to time may reasonably
request;

                           (iv)     cause all such EMCON Common Stock 
registered  pursuant hereunder to be listed on each securities exchange on which
similar securities issued by EMCON are then listed; and

                           (v)      otherwise use its best efforts to comply 
with all applicable rules and regulations of the Commission.

                  (b) If the  registration  of which EMCON gives notice is for a
registered public offering involving an underwriting,  EMCON shall so advise the
Management  Stakeholders  as a part of the  written  notice  given  pursuant  to
Section  4(a)(i).  In such event,  the right of any  Management  Stakeholder  to
registration  pursuant  to  this  Section  4  shall  be  conditioned  upon  such
Management Stakeholder's participation in such underwriting and the inclusion of
such  Management  Stakeholder's  Management  Shares in the  underwriting  to the
extent  provided  herein.  All Management  Stakeholders  proposing to distribute
their securities  through such  underwriting  shall (together with EMCON and the
other  holders of securities of EMCON with  registration  rights to  participate
therein  distributing their securities through such underwriting)  enter into an
underwriting  agreement  in  customary  form  with  the  representative  of  the
underwriter or underwriters selected by EMCON.

                  (c)  Notwithstanding any other provision of this Section 4, if
the  representative of the underwriters  advises EMCON in writing that marketing
factors  require a limitation  on the number of shares to be  underwritten,  the
representative  may (subject to the limitations set forth below) exclude all the
Management Stakeholders from, or limit the number of the Management Shares to be
included  in,  the  registration  and  underwriting.  EMCON  shall so advise the
Management  Stakeholders  and all other holders of EMCON  securities (the "Other
Shares")  requesting  registration and the number of Management Shares and Other
Shares that may be included shall be allocated among the Management Stakeholders
and other selling  stockholders  requesting  inclusion of shares pro rata on the
basis of the number of Management  Shares and Other Shares that are requested to
be registered.

                  (d)  EMCON's  obligations  pursuant  to this  Section  4 shall
expire  as to  each  Management  Stakeholder  at such  time  as such  Management
Stakeholder  may sell all shares of EMCON Common Stock issued upon  exchange for
such  Management  Stakeholder's  Note during any  successive  two quarter period
pursuant to Rule 144 under the Securities Act.

                                       83
<PAGE>

         5. Expenses of Registration.  All Registration Expenses (as hereinafter
defined)  incurred  in  connection  with  any  registration,   qualification  or
compliance  pursuant  to  Section 3 and 4 hereof  shall be borne by  EMCON.  All
Selling Expenses (as hereinafter  defined)  relating to securities so registered
shall be borne by the Management Stakeholders who own such Management Shares pro
rata on the basis of the  number of  Management  Shares so  registered  on their
behalf.  For purposes of this Section 5,  Registration  Expenses  shall mean all
expenses  incurred in effecting  any  registration  pursuant to this  Agreement,
including, without limitation, all registration, qualification, and filing fees,
printing  expenses,  escrow fees, fees and  disbursements  of counsel for EMCON,
blue sky fees and  expenses,  and  expenses  of any  regular or  special  audits
incident to or required by any such registration,  but shall not include Selling
Expenses and fees and disbursements of counsel for the Management  Stakeholders.
For  purposes of this Section 5. Selling  Expenses  shall mean all  underwriting
discounts  and  selling  commissions  applicable  to the sale of the  Management
Shares and fees and  disbursements  of counsel  for any  Management  Stakeholder
(other  than the fees and  disbursements  of counsel  included  in  Registration
Expenses).

         6.       Indemnification.

                  (a) EMCON will  indemnify  each  Management  Stakeholder  with
respect to which  registration,  qualification,  or compliance has been effected
pursuant to this Agreement,  and each  underwriter,  if any, and each person who
controls   within  the  meaning  of  Section  15  of  the  Securities  Act,  any
underwriter,  against all expenses, claims, losses, damages, and liabilities (or
actions, proceedings, or settlements in respect thereof) arising out of or based
on any untrue  statement  (or  alleged  untrue  statement)  of a  material  fact
contained in any prospectus offering circular,  or other document (including any
related registration statement,  notification, or the like) incident to any such
registration, qualification, or compliance, or based on any omission (or alleged
omission)  to state  therein a material  fact  required to be stated  therein or
necessary to make the  statements  therein not  misleading,  or any violation by
EMCON of the Securities Act or any rule or regulation  thereunder  applicable to
EMCON and relating to action or inaction  required of EMCON in  connection  with
any such  registration,  qualification,  or compliance,  and will reimburse each
such Management Stakeholder, each such underwriter, and each person who controls
any such underwriter,  for any legal and any other expenses  reasonably incurred
in connection with investigating and defending or settling any such claim, loss,
damage,  liability or action, provided that EMCON will not be liable in any such
case to the extent  that any such claim,  loss,  damage,  liability,  or expense
arises out of or is based on any untrue statement or omission based upon written
information furnished to EMCON by such Management Stakeholder or underwriter and
stated to be  specifically  for use  therein.  It is agreed  that the  indemnity
agreement  contained  in this  Section  6 shall  not  apply to  amounts  paid in
settlement  of any such  loss,  claim,  damage,  liability,  or  action  if such
settlement is effected  without the consent of EMCON (which consent has not been
unreasonably withheld).

                  (b) Each  Management  Stakeholder  will, if Management  Shares
held by him or her are included in the securities as to which such registration,
qualification,  or compliance is being effected,  indemnify  EMCON,  each of its
directors,   officers,   partners,  legal  counsel,  and  accountants  and  each
underwriter,  if any,  of  EMCON's  securities  covered  by such a  registration
statement, each person who controls EMCON or such underwriter within the meaning


                                       84
<PAGE>

of Section 15 of the  Securities  Act,  and each  other  Management  Stakeholder
against  all claims,  losses,  damages  any  liabilities  (or actions in respect
thereof)  arising out of or based on any untrue  statement  (or  alleged  untrue
statement)  of a material  fact  contained in any such  registration  statement,
prospectus,  offering circular,  or other document,  or any omission (or alleged
omission)  to state  therein a material  fact  required to be stated  therein or
necessary to make the  statements  therein not  misleading,  and will  reimburse
EMCON and such Management  Stakeholders,  directors,  officers,  partners, legal
counsel, and accountants, persons, underwriters or control persons for any legal
or any other expenses  reasonably  incurred in connection with  investigating or
defending any such claim,  loss, damage,  liability,  or action, in each case to
the extent,  but only to the  extent,  that such  untrue  statement  (or alleged
untrue statement) or omission (or alleged omission) is made in such registration
statement, prospectus, offering circular, or other document in reliance upon and
in conformity  with written  information  furnished to EMCON by such  Management
Stakeholder and stated to be  specifically  for use therein  provided,  however,
that the obligations of such Management Stakeholder hereunder shall not apply to
amounts paid in settlement of any such claims,  losses,  damages, or liabilities
(or actions in respect  thereof)  if such  settlement  is  effected  without the
consent of such Management  Stakeholder (which consent shall not be unreasonably
withheld).

                  (c) Each party entitled to indemnification  under this Section
6 (the  "Indemnified  Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit  the  Indemnifying  Party to  assume  the  defense  of such  claim or any
litigation  resulting  therefrom,  provided  that  counsel for the  Indemnifying
Party,  who shall conduct the defense of such claim or any litigation  resulting
therefrom,  shall be approved by the Indemnified Party (whose approval shall not
unreasonably  be withheld),  and the  Indemnified  Party may participate in such
defense at such party's  expense,  and provided  further that the failure of any
Indemnified  Party to give  notice as  provided  herein  shall not  relieve  the
Indemnifying  Party of its obligations under this Agreement,  to the extent such
failure is not  prejudicial.  No Indemnifying  Party, in the defense of any such
claim or litigation,  shall,  except with the consent of each Indemnified Party,
consent  to entry of any  judgment  or enter into any  settlement  that does not
include as an unconditional term thereof the giving by the claimant or plaintiff
to such  Indemnified  Party of a release from all liability with respect to such
claim or  litigation.  Each  Indemnified  Party shall  furnish such  information
regarding  itself  or  the  claim  in  question  as an  Indemnifying  Party  may
reasonably request in writing and as shall be reasonably  required in connection
with defense of such claim and litigation resulting therefrom.

                  (d) If the  Indemnification  provided for in this Section 6 is
held by a court of competent  jurisdiction  to be  unavailable to an Indemnified
Party with respect to any loss, liability, claim, damage, or expense referred to
therein,  then the Indemnifying  Party, in lieu of indemnifying such Indemnified
Party  hereunder,  shall  contribute  to the  amount  paid  or  payable  by such
Indemnified Party as a result of such loss, liability, claim, damage, or expense
in such  proportion  as is  appropriate  to reflect  the  relative  fault of the
Indemnifying  Party on the one hand and of the Indemnified Party on the other in
connection  with  the  statements  or  omissions  that  resulted  in such  loss,
liability,  claim,  damage, or expenses as well as any other relevant  equitable
considerations.  The  relative  fault  of  the  Indemnifying  Party  and  of the


                                       85
<PAGE>

Indemnified  Party shall be  determined  by reference  to,  among other  things,
whether  the  untrue or  alleged  untrue  statement  of a  material  fact or the
omission  to state a  material  fact  relates  to  information  supplied  by the
Indemnifying Party or by the Indemnified Party and the parties' relative intent,
knowledge,  access to  information,  and  opportunity to correct or prevent such
statement or omission.

                  (e)  Notwithstanding  the  foregoing,  to the extent  that the
provisions on  indemnification  and  contribution  contained in the underwriting
agreement  entered into in connection with the underwritten  public offering are
in conflict with the  foregoing  provisions,  the provision in the  underwriting
agreement shall control.

         7. Rule 144 Reporting.  With a view to making available the benefits of
certain  rules and  regulations  of the  Commission  that may permit the sale of
restricted  securities to the public without  registration,  EMCON agrees to use
its best efforts to:

                  (a)      Make and keep public information regarding EMCON 
available  as those  terms  are  understood  and  defined  in Rule 144 under the
Securities Act;

                  (b) File with the  Commission  in a timely  manner all reports
and  other  documents  required  of  EMCON  under  the  Securities  Act  and the
Securities Exchange Act of 1934, as amended; and

                  (c) So long as a Management  Stakeholder  owns any  restricted
securities, furnish to the Management Stakeholder forthwith upon written request
a  written   statement  by  EMCON  as  to  its  compliance  with  the  reporting
requirements of Rule 144; and of the Securities Act and the Exchange Act.

         8. OWT'S Registration Rights  Obligations.  In the event that OWT shall
be  required  to  register  shares of its stock  pursuant  to Section 2.3 of the
Notes, then the provisions of Sections 4 to 7 hereof shall apply with respect to
such registration.

         9.       Miscellaneous.

                  (a)  Notices.  All  notices,  consents,   waivers,  and  other
communications  under this  Agreement  must be in writing  and will be deemed to
have been duly given when (a)  delivered by hand (with written  confirmation  of
receipt),  (b)  sent by  telecopier  (with  written  confirmation  of  receipt),
provided  that a copy is mailed  within  three (3) business  days by  registered
mail, return receipt requested, (c) when received by the addressee, if sent by a
nationally  recognized  overnight delivery service (receipt  requested),  or (d)
three (3) business days after being sent by registered or certified mail, return
receipt  requested,  in each case to the  appropriate  addresses and  telecopier
numbers set forth below (or to such other addresses and telecopier  numbers as a
party may designate by notice to the other parties):

         Management Stakeholders:   To each Management Stakeholder at the 
                                    address set forth on Schedule 1

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<PAGE>

         EMCON:                     EMCON
                                    400 S. El Camino Real, Suite 1200
                                    San Mateo, California  94402
                                    Attention:  R. Michael Momboisse, Esq.
                                         
                  (b)      Entire Agreement.  This Agreement constitutes the 
entire agreement of the parties with respect to the matters contemplated herein.
This  Agreement  supersedes any and all prior  understandings  as to the subject
matter of this Agreement.

                  (c)  Amendments,  Waivers and Consents.  Any provision in this
Agreement  to the  contrary  notwithstanding,  changes in or  additions  to this
Agreement may be made, and compliance with any covenant or provision  herein set
forth  may  be  omitted  or  waived,  if  agreed  to  by  EMCON  and  Management
Stakeholders  holding Notes representing in aggregate in excess of Fifty Percent
(50%) of the aggregate amount due under all of the Notes.

                  (d)  Binding  Effect;  Assignment.  This  Agreement  shall  be
binding  upon and  inure to the  benefit  of the  personal  representatives  and
successors  of  the  respective  parties  hereto,   except  that  no  Management
Stakeholder  shall have the right to assign its rights hereunder or any interest
herein without obtaining the prior written consent of EMCON. Notwithstanding the
foregoing, each Management Stakeholder may assign his rights hereunder

                           (i)      to his spouse, parents, grandparents,
children or  grandchildren  or other  family  members  (including  relatives  by
marriage), or to a custodian,  trustee or other fiduciary for his account or the
account of a member of his family, or

                           (ii)     by way of bequest or inheritance upon death.

                  (e) General.  The headings contained in this Agreement are for
reference  purposes  only  and  shall  not in any  way  affect  the  meaning  or
interpretation  of this Agreement.  In this Agreement the singular  includes the
plural, the plural the singular.

                  (f) Severability.  If any provision of this Agreement shall be
found by any court of competent jurisdiction to be invalid or unenforceable, the
parties hereby waive such provision to the extent that it is found to be invalid
or unenforceable.  Such provision shall, to the maximum extent allowable by law,
be modified  by such court so that it becomes  enforceable,  and,  as  modified,
shall be enforced as any other provision hereof, all the other provisions hereof
continuing in full force and effect.

                  (g)      Counterparts.  This Agreement may be execute in 
counterparts,   all  of  which  together  shall  constitute  one  and  the  same
instrument.

                  (h)      Governing Law.  This Agreement shall be governed by 
the internal laws of the State of Delaware  without  regard to the principles of
conflict of laws.



                                       87
<PAGE>




         IN WITNESS  WHEREOF,  the parties have caused this Agreement to be duly
executed as of the date first written above.


EMCON


          By:        /S/ Eugene M. Herson
                    -----------------------
          Title:   President & Chief Executive Officer


          ORGANIC WASTE TECHNOLOGIES, INC.

          By:       /s/ Mark Shipps
                   ----------------
          Title:   President


          MANAGEMENT STAKEHOLDERS


           /s/
           ----------------
           MARK H. SHIPPS


          /s/
          ------------------
          ANTHONY A. ALEXANDER


          /s/
          ------------------
          JAMES HELMICK


          /s/
          ------------------
          RAYMOND J. NARDELLI


          /s/
          ------------------
          STEPHEN LINGAFELTER


          /s/
          ------------------
          RANDALL W. CHAPMAN

                                       88
<PAGE>


                                  EXHIBIT 10.2

                                CREDIT AGREEMENT



THIS  AGREEMENT  is made as of February  29, 1996  between  EMCON,  a California
corporation ("Borrower"), and THE BANK OF CALIFORNIA, N.A. ("Bank").

                            ARTICLE ONE - DEFINITIONS

The  definitions  appearing in this  Agreement or any  supplement or addendum to
this Agreement, shall be applicable to both the singular and plural forms of the
defined terms:

"Advance" means an extension of credit under this Agreement or any supplement to
this Agreement.

"Affiliate"  means  any  Person  which  directly  or  indirectly  controls,   is
controlled by, or is under common control with, Borrower. "Control," "controlled
by" and "under common  control with" means direct or indirect  possession of the
power to  direct or cause the  direction  of  management  or  policies  (whether
through ownership of voting securities, by contract or otherwise); provided that
control  shall be  conclusively  presumed  when any Person or  affiliated  group
directly  or  indirectly  owns five  percent  or more of the  securities  having
ordinary voting power for the election of directors of a corporation.

"Alaska"  means EMCON  Alaska,  Inc., an Alaska  corporation,  one of Borrower's
Subsidiaries.

"Agreement"  means this Credit  Agreement  as it may be amended or  supplemented
from time to time.

"CAS" means Columbia Analytical Services, Inc., a Washington corporation, one of
Borrower's Subsidiaries.

"Closing Date" means the date of this Agreement.

"Consolidated", "consolidating", "on a consolidated basis" and terms and phrases
of like import  mean,  when  describing  financial  statements,  information  or
covenants, those of Borrower and its Subsidiaries.

"Consolidated  financial  statements" means financial  statements that disregard
the  distinction  between  separate  legal  entities  and treat a parent and its
subsidiary(ies) as a single economic entity for financial presentation purposes.

                                       89
<PAGE>

"Consolidating  financial  statements" means financial  statements that show the
accounting  for each related legal entity  side-by-side,  then set forth current
inter-company transactions, and finally, consolidated figures.

"Credit Limit" means the limitation on all credit extensions  defined in Section
2.1.1 of this Agreement.

"Effective Net Worth" means, on a consolidated  basis, the net book value of (a)
all  Borrower's  assets,  exclusive of  intangibles,  and loans to and notes and
receivables  from Related  Persons,  plus all  Subordinated  Debt, minus (b) all
Borrower's   liabilities   determined   in  accordance   with  GAAP,   excluding
Subordinated Debt.

"Event of Default" means any event described in Article 7.

"Facility"  means the credit  accommodations  being provided  Borrower under the
terms and  conditions of this  Agreement or any  supplement  to this  Agreement,
which  credit  accommodations  are the Line of Credit  and the Term Loan as more
fully described in Article 2 or any supplement to this Agreement.

"Fixed Rate Option  Letter" means the  Eurodollar  Rate Option Letter  agreement
and/or the Amortizing Term Loan Fixed Rate Option Letter  agreement of even date
with this Agreement between Bank and Borrower.

"GAAP" means generally accepted accounting  principles and practices  consistent
with those  principles  and  practices  promulgated  or adopted by the Financial
Accounting  Standards Board and the Board of the American Institute of Certified
Public  Accountants,   their  respective   predecessors  and  successors.   Each
accounting term used but not otherwise  expressly  defined herein shall have the
meaning given it by GAAP.

"Letters  of Credit"  means all  standby  letters of credit  issued  pursuant to
Section 2.1.1(b) of this Agreement.

"Lien" means any voluntary or involuntary security interest,  mortgage,  pledge,
claim,  charge,  encumbrance,  title retention  agreement,  or other third party
encumbrance,  covering  all or any part of the property of Borrower or any other
Person.

"Loan Documents"  means,  individually  and  collectively,  this Agreement,  any
supplement to this Agreement, the Notes, any rate option agreements, guaranties,
security or pledge agreements, and all other contracts, instruments, addenda and
documents executed in connection with this Agreement or the extensions of credit
which are the subject of this Agreement.

                                       90
<PAGE>

"Note" means the  promissory  notes in form and substance  satisfactory  to Bank
executed by Borrower to evidence the Line of Credit and the Term Loan. Each Note
shall be named for the Facility it represents.

"OWT" means Organic Waste Technologies, Inc.

"OWT  Acquisition"  means  Borrower's  purchase  of a majority of the issued and
outstanding  shares  of  capital  stock  and  securities   convertible  into  or
exercisable  for such stock from  certain  stakeholders  of OWT pursuant to that
certain Stock Purchase Agreement dated January 30, 1996.

"OWT Convertible  Notes" means those certain  promissory notes issued by OWT and
guaranteed  by  Borrower  to  certain  shareholders  of OWT in  connection  with
Borrower's OWT Acquisition.

"Person" means any individual or entity,  including,  without  limitation,  Bank
where the context so permits and in Bank's sole discretion.

"Permitted Liens" means:

              (i) Liens for taxes,  assessments,  governmental charges or levies
not yet due or which  are  being  contested  in good  faith  and by  appropriate
proceedings  if adequate  reserves  with respect  thereto are  maintained on the
books of the  Borrower  or the  appropriate  Subsidiary,  as the case may be, in
accordance with GAAP;

             (ii)   statutory   Liens  of  landlords  and  carriers'   vendors',
warehousemen's,  mechanics',  materialmen's,  repairmen's,  or other  like Liens
arising in the ordinary course of business which are not overdue for a period of
more than 60 days or which are being  contested in good faith and by appropriate
proceedings  in a manner which will not  jeopardize  or diminish the interest of
Bank in any of the collateral that is subject to the Loan Documents or interfere
with the ordinary conduct of the business of the Borrower or any Subsidiary;

            (iii) pledges or deposits and Liens (other than any Liens imposed by
ERISA)  under  bonds   required  in  connection   with  worker's   compensation,
unemployment insurance and other social security legislation;

             (iv)  Liens   (other   than  any  Lien   imposed  by  ERISA  or  by
environmental  laws) incurred on deposits to secure the  performance of tenders,
bids,  trade  contracts  (other  than for  borrowed  money),  leases,  statutory
obligations,  surety and appeal bonds, performance and return-of-money bonds and
other obligations of a like nature incurred in the ordinary course of business;

              (v)  easements,  rights-of-way,  restrictions  and  other  similar
encumbrances   incurred  in  the  ordinary  course  of  business  which  do  not


                                       91
<PAGE>

substantially  detract  from  the  value  of the  property  subject  thereto  or
interfere  with the  ordinary  conduct of the  business  of the  Borrower or any
Subsidiary; and

             (vi) Liens in existence on the date hereof  listed on Schedule 6.2,
provided that no such Lien is extended to cover any  additional  property  after
the date hereof and that the amount of debt secured thereby is not increased.

"Related  Person"  means,  with  respect to any Person,  any  Affiliate  of such
Person, or any officer, employee,  director or shareholder of such Person or any
Affiliate, or a relative of any of them.

"Sublimit" or "Sublimits"  means,  individually and  collectively,  the separate
limitations on credit  extensions  defined in the subsection(s) of Section 2.1.1
of this Agreement.

"Subordinated  Debt"  means any  indebtedness  of  Borrower  that has been fully
subordinated in right of payment to Borrower's obligations to Bank pursuant to a
written agreement in form and substance satisfactory to Bank.

"Subsidiary" means, with respect to Borrower, any corporation or other entity of
which  securities or other ownership  interests  having ordinary voting power to
elect a majority of the board of directors or other persons  performing  similar
functions are directly or indirectly owned by Borrower.  "Subsidiary"  includes,
without  limitation,  each  of the  Persons  listed  on  Schedule  3.8  to  this
Agreement, as the same may be amended or supplemented from time to time.

"Tangible Net Worth" means, on a consolidated  basis,  the net book value of (a)
all  Borrower's  assets,  exclusive  of  intangibles  and loans to and notes and
receivables  from  Related  Persons,  plus  Subordinated  Debt,  minus  (b)  all
Borrower's  liabilities,  determined  in  accordance  with GAAP,  but  excluding
Subordinated Debt.

"Termination  Date" means the earlier of (a) the date Bank may terminate  making
Advances or extending  credit pursuant to the rights of Bank under Article 7; or
(b) May 31, 1997 for the Line of Credit; or (c) June 30, 2001 for the Term Loan.

"UCC"  means  the  Uniform   Commercial   Code  as  enacted  in  the  applicable
jurisdiction, in effect on the Closing Date and as amended from time to time.

                 ARTICLE TWO - THE FACILITIES AND RELATED TERMS
                                 AND CONDITIONS

Subject to the terms and conditions of this Agreement,  the following Facilities
shall be available to Borrower:

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2.1      The Facilities.

         2.1.1  Line of  Credit.  Subject  to the terms and  conditions  of this
Agreement,  from time to time prior to the  Termination  Date,  upon  request by
Borrower,  Bank will provide extensions of credit ("Line of Credit") to Borrower
in the form of  Advances,  Letters of Credit and advances on account of business
credit cards that,  in the  aggregate,  shall not exceed at any time Ten Million
Dollars ($10,000,000.00) (the "Credit Limit"), in the following manner:

         (a)  Advances.  Provide up to  $10,000,000.00  of the  Credit  Limit in
         aggregate   outstanding   principal  amounts  ("Advance  Sublimit")  in
         Advances to Borrower.  Each Advance  shall be payable no later than the
         Termination  Date.  Borrower may borrow,  repay and reborrow  under the
         Advance  Sublimit,  as  Borrower  may  elect,  in  minimum  amounts  of
         $10,000.00 or integral  multiples  thereof.  Advances  shall be used by
         Borrower for the purpose of working  capital for its own operations and
         those  of  its  Subsidiaries  other  than  OWT;  provided,  that  up to
         $5,000,000 of Advances  outstanding at any time may be used by Borrower
         or its  Subsidiaries  (other than OWT) for purposes  other than working
         capital;  and further  provided,  that Borrower may reloan  Advances to
         OWT,  so long as (i) the  aggregate  Advances  reloaned  do not  exceed
         $1,000,000.00 at any time outstanding,  and (ii) no Advances are relent
         to OWT  while  OWT is in  default  under any  agreement  involving  the
         borrowing of money or the advance of credit  where such  default  gives
         the holder of such indebtedness the right to accelerate the same.

         (b) Standby Letters of Credit.  Provide up to $200,000.00 of the Credit
         Limit in aggregate  outstanding unpaid face amounts ("Standby Letter of
         Credit  Sublimit")  for the  purpose  of issuing  irrevocable,  standby
         Letters of Credit, in form and substance  satisfactory to Bank, for the
         account of  Borrower in United  States  Dollars.  No standby  Letter of
         Credit  will expire  later than thirty (30) days after the  Termination
         Date.  For each  standby  Letter of  Credit,  Borrower  shall  execute,
         deliver and perform in  accordance  with Bank's  standard  form Standby
         Letter of Credit  Application & Agreement  (or any  successor  standard
         agreement  executed by Borrower),  all terms of which are  incorporated
         herein by this reference.

         (c) Business Credit Cards. The amount of the Credit Limit available for
         the making of Advances and issuance of Letters of Credit under the Line
         of Credit  shall be  reduced  by the  amount of  Bank's  commitment  to
         Borrower  in effect  from time to time  under a  business  credit  card
         facility  for travel and  entertainment  business  expenses.  As of the
         Closing Date,  the amount  committed  under such  separate  facility is
         $55,000.00.

         (d) Credit Limits. If at any time any Sublimit, or the Credit Limit, as
         a whole, has been exceeded,  Borrower shall, within five (5) days after
         demand by Bank,  repay such  excess,  or, as Bank might  specify,  cash
         secure such excess.

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         2.1.2 Term Loan.  A term loan in the original  principal  amount of Ten
Million Dollars ($10,000,000) ("Term Loan"), the proceeds of which shall be used
by Borrower to finance Borrower's acquisition of 100% of the outstanding capital
stock and options exercisable for stock of OWT. The Term Loan shall be evidenced
by the Term Loan Note and shall be amortized and fully repaid in accordance with
the terms thereof by the Termination Date.

2.2      Requests for Advances and Method of Advancing.

         (a) Requests  for  Advances.  Advances may be requested in writing,  by
         telephone,   telex  or  otherwise  on  behalf  of  Borrower.   Borrower
         recognizes and agrees that Bank cannot effectively  determine whether a
         specific  request  purportedly  made by or on  behalf  of  Borrower  is
         actually authorized or authentic.  As it is in Borrower's best interest
         that Bank advance funds in response to these forms of request, Borrower
         assumes  all  risks  regarding  the  validity,   authenticity  and  due
         authorization  of any request  purporting to be made by or on behalf of
         Borrower.  Borrower promises to repay any sums, with interest, that are
         advanced  by Bank  pursuant  to any  request  which  Bank in good faith
         believes  to be  authorized,  or when the  proceeds  of any Advance are
         deposited to the account of Borrower  with Bank,  regardless of whether
         any Person other than Borrower may have  authority to draw against such
         account.

         (b)      Automatic Deposit.  Each Advance shall be made by a deposit
          to  Borrower's  account No.  027-007753  at Bank's San Mateo  Regional
          Office  ("Deposit  Account"),  unless Borrower shall otherwise  direct
          Bank in writing by an authorized signatory.

         (c) Wire Transfer of Funds.  The obligation of Bank to make any Advance
         to Borrower,  the proceeds of which are, at Borrower's  request,  to be
         wire  transferred to Borrower or any other Person,  shall be subject to
         all  applicable  laws and  regulations,  and the policy of the Board of
         Governors of the Federal Reserve System on Reduction of Payments System
         Risk  in  effect  from  time  to time  ("Applicable  Law and  Policy").
         Borrower  acknowledges  that, as a result of Applicable Law and Policy,
         the  transmission  of the  proceeds of any Advance  which  Borrower has
         requested to be wire-transferred may be significantly delayed.

2.3      Interest On The Facilities.

         2.3.1 Line of Credit.  Except as  otherwise  provided in any Fixed Rate
Option Letter in effect from time to time, interest on the outstanding principal
balance of Advances under the Line of Credit shall accrue daily from the date of
the first Advance until the Termination  Date at the Prime Rate (defined below),
and shall be payable as set forth in the Line of Credit Note.

         2.3.2 Term Loan. Except as otherwise  provided in any Fixed Rate Option
Letter in effect from time to time,  the  outstanding  principal  balance of the


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Term  Loan  shall  bear  interest  from  the  date  of  disbursement  until  the
Termination Date at the Prime Rate (defined below). Interest shall be payable as
set forth in the Term Loan Note.

2.4      Interest Rate Related Terms & Provisions.

         (a)  Definition  of  "Prime  Rate".  The  term  "Prime  Rate"  means  a
         fluctuating  rate per annum that Bank  announces  to be in effect  from
         time to time as its prime  rate.  The Prime  Rate is set by Bank  based
         upon various factors including general economic and market  conditions,
         and is used as a reference  point for pricing  certain loans.  Bank may
         price its loans at, above or below the Prime Rate.

         (b) Interest Rate Calculation. Interest tied to the Prime Rate, charges
         and  fees  under  this  Agreement  and  any  Loan  Document,  shall  be
         calculated  for actual  days  elapsed  on the basis of a 360-day  year,
         which  results in higher  interest,  charge or fee  payments  than if a
         365-day year were used. Each change in the rate of interest, charges or
         fees based on the Prime Rate shall  become  effective  on the date each
         Prime  Rate  change is  announced  within the Bank.  In no event  shall
         Borrower be  obligated  to pay  interest,  charges or fees at a rate in
         excess of the highest  rate  permitted by  applicable  law from time to
         time in effect.

         (c)      Prepayment.

                           (i) General.  Unless  otherwise  agreed by Bank,  all
                  principal  prepayments  shall be  applied  on the most  remote
                  principal  installment(s) then unpaid on the Facility on which
                  the  prepayment is being made. If such Facility bears interest
                  at  a  fixed  rate  and  Bank,   for  any  reason,   including
                  acceleration  or  foreclosure,  receives all or any portion of
                  principal  prior  to its  scheduled  payment  date,  then,  in
                  consideration thereof,  Borrower shall pay to Bank on demand a
                  prepayment fee as liquidated  damages as described in the Note
                  evidencing  such  Facility  or any Fixed Rate  Option  Letter,
                  since such prepayment may result in Bank incurring  additional
                  costs, expenses or liabilities.

                           (ii)  Mandatory Prepayments of Term Loan.

                                    (A)  Commencing  with  Borrower's  financial
                  reporting  year  ending  December  31,  1996 and for each year
                  thereafter,  if  Borrower's  consolidated  actual  net  income
                  before taxes ("ANIT") for such year as reflected on Borrower's
                  annual  financial  statements  required  under Section  5.4(b)
                  exceeds more than one hundred  twenty-five  percent  (125%) of
                  the amount of  consolidated  net income before taxes projected
                  for such  financial  reporting  year  ("PNIT")  in the  annual
                  projections previously delivered to Bank under Section 5.4(d),
                  then  Borrower  shall prepay  principal of the Term Loan in an


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                  amount  equal to  twenty-five  percent  (25%) of the amount by
                  which ANIT exceeded 125% of PNIT.

                                    (B) Such prepayment shall be due and payable
                  within ten (10) days after  delivery by Borrower of the annual
                  financial  statements under Section 5.4(b), but not later than
                  one-hundred  thirty (130) days after the end of the  financial
                  reporting  year with  respect to which such  excess net income
                  was earned.  There shall be no prepayment premium,  penalty or
                  other charge on such prepayment  except to the extent required
                  to be paid under the  applicable  provisions of any Fixed Rate
                  Option  Letter in effect  with  respect to  principal  amounts
                  prepaid.  Subject to the first sentence of Section  2.4(c)(i),
                  Bank agrees to apply each such  prepayment  first to principal
                  amounts of the Term Loan  bearing  interest at the Prime Rate,
                  and then to  principal  amounts  bearing  interest  at a fixed
                  rate; in lieu of the foregoing, so long as no Event of Default
                  has occurred and is continuing, Borrower may request that Bank
                  hold all or a portion of any  prepayment  (such  amount  being
                  referred to herein as "Cash  Collateral")  in a segregated and
                  blocked  deposit  account  at Bank,  rather  than  immediately
                  applying  such  amount to payment of the Term Loan,  until the
                  earliest  succeeding  date(s)  on which  fixed  rate  interest
                  periods expire and the Cash Collateral  amounts can be applied
                  to the Term Loan  without  Borrower  incurring  any premium or
                  charge  therefor.  Interest earned on Cash Collateral shall be
                  for  Borrower's  account and paid to Borrower  promptly  after
                  application of the Cash Collateral to the Term Loan.

                                    (C) For purposes of determining  the excess,
                  if any,  of ANIT  over PNIT  under  this  Section  2.4(c)(ii),
                  Borrower shall  calculate ANIT derived from  operations of the
                  businesses  of Borrower and its  Subsidiaries  on a comparable
                  basis to those businesses assumed to be in operation under the
                  projections,  business  plan and  forecasts  on which PNIT was
                  based;  by way of example and not of limitation,  any items of
                  actual income or expense  associated  with an  acquisition  of
                  stock,  assets or a new line of business  during the financial
                  reporting year which was not assumed in deriving PNIT shall be
                  separately  identified  and excluded from ANIT for purposes of
                  this  Section;  provided,  that any gains or  losses  from any
                  sale,  lease,  transfer  or other  disposition  of  assets  by
                  Borrower or any Subsidiary  outside of the ordinary  course of
                  its business shall not be excluded in determining  ANIT.  Bank
                  shall  have the right to review and  approve,  in its sole but
                  reasonable  judgment,  Borrower's  calculation of ANIT and the
                  amount  of  any   prepayment   required   under  this  Section
                  2.4(c)(ii), and Bank's acceptance of Borrower's tender of such
                  prepayment  shall not,  by itself,  be deemed a waiver of such
                  right.

         (d) Default  Interest.  Any unpaid  payments of  principal  or interest
         shall bear interest from their respective maturities, whether scheduled


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<PAGE>

         or accelerated,  at a fluctuating  rate per annum at all times equal to
         the Prime  Rate plus 5%,  until paid in full,  whether  before or after
         judgment. Borrower shall pay such interest on demand.

         (e) Fixed Rate  Options.  In addition  to an interest  rate tied to the
         Prime Rate, at Borrower's option, portions of the outstanding principal
         balance of (i) the Line of Credit  Facility may bear  interest  tied to
         the  Eurodollar  Rate from time to time  offered by Bank,  and (ii) the
         Term  Loan  may  bear  interest  tied  to the  Eurodollar  Rate  or the
         Amortizing  Term Loan Fixed Rate from time to time offered by Bank. The
         fixed rates are more fully  explained in the Fixed Rate Option  Letters
         executed  in  connection  with this  Agreement,  all terms of which are
         incorporated by this reference.

2.5      Bank's Records/Payment Applications/Automatic Debit.

         (a) Bank's Records.  Principal,  interest, and all other sums owed Bank
         under any Loan  Document  shall be  evidenced  by  entries  in  records
         maintained  by Bank for such  purpose.  Each  payment  on and any other
         credits  with  respect  to  principal,  interest  and  all  other  sums
         outstanding  under any Loan  Document  shall be evidenced by entries in
         such records. Bank's records shall be conclusive evidence thereof.

         (b) Payment Applications.  Notwithstanding the rights given to Borrower
         pursuant to California  Civil Code sections 1479 and 2822 or equivalent
         provisions  in the laws of the state  specified  in the  governing  law
         clause of this document (and any amendments or successors thereto),  to
         designate  how payments  will be applied,  Borrower  hereby waives such
         rights  and Bank  shall  have  the  right  in its  sole  discretion  to
         determine the order and method of the  application  of payments to this
         and/or any other  credit  facilities  that may be  provided  by Bank to
         Borrower and to revise such application  prospectively or retroactively
         at its discretion.  Notwithstanding  the foregoing,  and subject to the
         first sentence of Section 2.4(c)(i), so long as no Event of Default has
         occurred  and is  continuing,  Bank agrees to apply  payments  first to
         outstanding  amounts under the Facilities bearing interest at the Prime
         Rate, and then to amounts bearing interest at a fixed rate.

         (c) Payments by Automatic Debit.  Borrower hereby expressly  authorizes
         Bank to debit the  Deposit  Account  for the amount of each  payment of
         principal  and  interest  and all other  sums owed Bank  under any Loan
         Document.  Borrower shall have  sufficient  collected  balances in said
         account in order that each such payment shall be available when due.

2.6      Fees On The Facilities.

         2.6.1  Line of  Credit.  Borrower  shall pay to Bank no later  than the
Closing Date a non-refundable  fee of Fifteen Thousand Dollars ($15,000) for the
Line of Credit.

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<PAGE>

         2.6.2 Letters of Credit.  Without limiting  Borrower's  obligations for
any Letter of Credit,  as such  obligations  are  contained in any specific Loan
Document  applicable  thereto,  Borrower  shall pay fees,  charges,  and expense
reimbursement  and recovery as determined  by Bank for the issuance,  amendment,
continuance,   and  handling  of  Letters  of  Credit,   requests,   claims  and
communications thereunder, and negotiation of drafts presented thereunder.

         2.6.3 Term Loan.  Borrower  shall pay to Bank no later than the Closing
Date a non-refundable fee of Fifty Thousand Dollars ($50,000) for the Term Loan.

2.7      Security.

As security for all  Facilities,  Borrower will (a) grant to Bank or ensure that
Bank is granted a perfected security interest of first priority in substantially
all of Borrower's  now owned and hereafter  arising  personal  property  assets,
including,  without  limitation,  accounts,  inventory,  equipment,  and  all of
Borrower's shares of capital stock of OWT, Alaska and CAS; and (b) cause CAS and
Alaska to grant or ensure  that Bank is  granted  a  perfected  security  in all
personal property assets of such Subsidiaries.  Such security interests shall be
evidenced by pledge agreements and other security agreements, as appropriate, in
form and substance satisfactory to Bank.

                 ARTICLE THREE - REPRESENTATIONS AND WARRANTIES

Borrower  represents  and  warrants  that as of the Closing Date and the date of
each Advance or extension of credit under any of the Facilities:

3.1 Due Organization. Each of Borrower and each Subsidiary is duly organized and
validly  existing in good  standing  under the laws of the  jurisdiction  of its
organization,  and is duly qualified to conduct business in each jurisdiction in
which its  business is  conducted,  except  where the failure to be so qualified
would not have a material adverse affect on the financial  condition or business
of Borrower or such Subsidiary.

3.2  Authorization,  Validity and  Enforceability.  The execution,  delivery and
performance by Borrower and each Subsidiary of each Loan Document executed by it
are within Borrower's and such Subsidiary's  powers,  have been duly authorized,
and are not in conflict with its articles of  incorporation  or by-laws,  or the
terms of any  charter  or other  organizational  document  of  Borrower  or such
Subsidiary,  as  applicable;  and all such Loan Documents  constitute  valid and
binding obligations of Borrower or such Subsidiary,  as applicable,  enforceable
in accordance with their terms.

3.3 Compliance with Applicable  Laws.  Borrower and each Subsidiary has complied
with all  licensing,  permit  and  fictitious  name  requirements  necessary  to


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<PAGE>

lawfully  conduct  the  business  in which it is  engaged  and with all laws and
regulations  applicable  to any sales,  leases or the  furnishing of services by
Borrower and each  Subsidiary,  including  without  limitation  those  requiring
consumer or other  disclosures,  except where the failure to so comply would not
have a material adverse effect on Borrower's  financial  condition,  business or
operations.

3.4  Licenses,  Trademarks.  Borrower  and  each  Subsidiary  has  all  patents,
licenses,  trademarks,   trademark  rights,  trade  names,  trade  name  rights,
copyrights,  permits  and  franchises  required in order for  Borrower  and each
Subsidiary to conduct its business and operate its properties as now or proposed
to be conducted without conflict with the rights of others.

3.5 No Conflict.  The execution,  delivery, and performance by Borrower and each
Subsidiary of all Loan  Documents to which it is a signatory are not in conflict
with any law, rule, regulation, order or directive, or any indenture, agreement,
or undertaking  to which  Borrower or such  Subsidiary is a party or by which it
may be bound or affected.

3.6      No Litigation, Claims or Proceedings.  There is no litigation, tax 
claim or proceeding pending, or, to the knowledge of Borrower, threatened
against or affecting  Borrower or any  Subsidiary  or its  respective  property,
except a disclosed in writing to Bank prior to the Closing Date.

3.7  Correctness  of Financial  Statements.  Borrower's  preliminary,  unaudited
financial  statements as of December 31, 1995 which have been  delivered to Bank
fairly and accurately  reflect Borrower's  financial  condition as of such date;
and,  since that date,  there has been no material  adverse change in Borrower's
financial condition or business.

3.8  No  Subsidiaries.  Borrower  is not a  majority  owner  of or in a  control
relationship  with any other business  entity,  except the Persons  specifically
identified as Subsidiaries on Schedule 3.8 to this Agreement. Except as shown on
Schedule  3.8,  Borrower  owns  directly  or  indirectly  through  one  or  more
Subsidiaries,  all  of the  shares  of all  Subsidiaries  outstanding  as of the
Closing  Date,  and will  continue  to own all such  shares  (other  than shares
permitted  to be issued to employees  under  Section  6.4);  and all such shares
owned by Borrower are validly  issued,  fully paid and  non-assessable  free and
clear of all Liens except in favor of Bank.

3.9    No Event of Default.  No Event of Default has occurred and is continuing.

                       ARTICLE FOUR - CONDITIONS PRECEDENT

4.1  Conditions  to Initial  Advance.  The  obligation of Bank to make its first
Advance  or extend  credit  under  either  of the  Facilities  hereunder  is, in
addition to the conditions  precedent  specified in Section 4.2,  subject to the
fulfillment  of the  following  conditions  and to the  receipt  by  Bank of the
documents described below, duly executed and in form and substance  satisfactory
to Bank and its counsel:

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<PAGE>

         (a)  Resolutions.  A certified copy of the  resolutions of the Board of
         Directors  of  Borrower,   authorizing  the  execution,   delivery  and
         performance of such Loan Documents to which it is a party.

         (b)  Incumbency  and  Signatures.   Certificate  of  the  Secretary  of
         Borrower,  certifying  the names of the  corporate  officer or officers
         authorized  to sign the Loan  Documents,  together with a sample of the
         true signature of each such officer.

         (c)  Opinion of Counsel.  The opinion of Gray Cary Ware &  Freidenrich,
         counsel  for  Borrower,  as to  the  existence  and  good  standing  of
         Borrower,  and the due  authorization,  execution and delivery by it of
         the Loan Documents to which it is signatory,  and such other matters as
         Bank or its legal counsel may reasonably request.

         (d)      Articles and By-Laws.  Certified copies of the Articles of 
         Incorporation  and By-Laws of Borrower,  as amended through the Closing
         Date.

         (e) Credit  Agreement and Notes.  A counterpart  of this Agreement with
         all schedules completed and attached thereto, and the Notes.

         (f) Security  Agreements.  A Security  Agreement  executed by Borrower,
         together with filing copies of such Uniform  Commercial  Code financing
         statements,  collateral  assignments and termination  statements,  with
         respect to the  Collateral  (as defined in such Security  Agreement) as
         Bank shall request.

         (g)      Pledge Agreement.  A Pledge Agreement executed by Borrower 
         with respect to its shares of capital stock in OWT, CAS and Alaska.

4.2 Conditions to All Loans.  The obligation of Bank to make its initial Advance
and extension of credit  hereunder and each  subsequent  Advance or extension of
credit is subject to the following further conditions precedent that:

         (a) No  Default.  No Event of Default or event which with the giving of
         notice,  passage of time or both would  constitute  an Event of Default
         has  occurred and is  continuing  or will result from the making of any
         such  Advance or  extension  of  credit,  and the  representations  and
         warranties  of Borrower  contained in Article 3 of this  Agreement  are
         true and correct as of the date of such extension of credit.

         (b)      No Adverse Material Change.  No material adverse change in 
          Borrower's  financial  condition or business shall have occurred since
          the date of the most recent financial statements submitted to Bank.

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4.3      Conditions Subsequent.

         (a) Pledged  Shares.  As soon as  available,  but not later than thirty
         (30) days after the Closing  Date,  Borrower  shall have  delivered  to
         Bank, all share  certificates  evidencing shares of capital stock owned
         by Borrower in OWT, CAS and Alaska, together with stock powers therefor
         executed in blank and undated with signature guaranties.

         (b) Resolutions.  As soon as available,  but not later than thirty (30)
         days after the Closing Date, certified copies of the resolutions of the
         Boards of  Directors  of CAS and  Alaska,  authorizing  the  execution,
         delivery  and  performance  of such Loan  Documents to which they are a
         party.

         (c) Incumbency and Signatures. As soon as available, but not later than
         thirty  (30)  days  after  the  Closing  Date,   certificates   of  the
         Secretaries  of CAS and Alaska,  certifying  the names of the corporate
         officer or officers  authorized  to sign the Loan  Documents,  together
         with a sample of the true signature of each such officer.

         (d) Opinion of Counsel. As soon as available, but not later than thirty
         (30) days  after  the  Closing  Date,  an  opinion  of Gray Cary Ware &
         Freidenrich,  counsel for CAS and Alaska,  as to the existence and good
         standing of CAS and Alaska,  and the due  authorization,  execution and
         delivery by them of the Loan Documents to which they are signatory, and
         such other matters as Bank or its legal counsel may reasonably request.

         (e)  Security  Agreements.  As soon as  available,  but not later  than
         thirty (30) days after the Closing Date, a Security  Agreement executed
         by each of CAS and Alaska,  together with filing copies of such Uniform
         Commercial  Code  financing  statements,   collateral  assignments  and
         termination  statements,  with respect to the Collateral (as defined in
         such Security Agreements) as Bank shall request.

         (f) Lien Searches. As soon as available,  but not later than sixty (60)
         days after the Closing Date,  certified  Uniform  Commercial Code lien,
         judgment,  bankruptcy and tax lien searches of Borrower, CAS and Alaska
         from each of the offices where the financing  statements referred to in
         Sections  4.1(f) and 4.3(e) have been filed,  reflecting  the filing of
         such  statements  and no  prior  Liens  of  record  other  than  herein
         permitted under Section 6.2.

                      ARTICLE FIVE - AFFIRMATIVE COVENANTS

During the term of this Agreement and until its  performance of all  obligations
to Bank under this  Agreement  and the other Loan  Documents  ,  Borrower  will,
unless Bank otherwise consents in writing:

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<PAGE>

5.1      Use of  Proceeds.  Use the proceeds of the  Facilities  only as set 
forth in Article 2 of this Agreement; and not directly or indirectly to purchase
or  carry  any  margin  stock,  as  defined  from  time to time by the  Board of
Governors of the Federal Reserve System in Federal Regulation U.

5.2      Financial Covenants.  Maintain as of the end of each financial 
reporting period on a consolidated basis:

         (a)      Working Capital.  Current assets in an amount not less than
         Twenty-five  Million  Dollars  ($25,000,000.00)  in excess  of  current
         liabilities.

         (b) Tangible Net  Worth/Debt To Worth. A Tangible Net Worth of not less
         than Forty-One Million Dollars ($41,000,000); and not permit Borrower's
         total  indebtedness  (exclusive of Subordinated Debt) to exceed one (1)
         times Borrower's Tangible Net Worth.

         (c)      Profitability.  Profitable operations on a quarterly basis.

         (d) Cash Flow  Coverage  Ratio.  A ratio of (i) cash  flow (net  income
         before   deduction   of  interest   expense,   taxes,depreciation   and
         amortization,  extraordinary  items and other non-cash charges) for the
         twelve (12) month period then ended,  to (ii) interest  expense  during
         such  12-month  period,  plus the  current  portion  of long  term debt
         determined as of the end of such period, of at least 1.6 to 1.0.

5.3      Notice to Bank.  Promptly give written notice to Bank of:

         (a) Any litigation or administrative  or regulatory  proceeding (each a
         "Proceeding" and collectively, the "Proceedings") affecting Borrower or
         any Subsidiary  where the amount claimed  against  Borrower  and/or any
         Subsidiary  (i) in any Proceeding is $500,000.00 or more or (ii) in all
         such Proceedings is $2,000,000.00 or more, or where the granting of the
         relief  requested  would have a material  adverse  effect on Borrower's
         financial condition or business; together with a semi-annual litigation
         report  prepared  by  Borrower's  general  counsel or outside  counsel,
         summarizing pending or threatened Proceedings against Borrower and such
         counsel's assessment as to the likely outcome of such Proceedings.

         (b)      Any substantial dispute which may exist between Borrower and 
         any governmental or regulatory authority.

         (c)      Any Event of Default.

         (d) Any change in the location of any of Borrower's principal places of
         business or of the  establishment of any new, or the  discontinuance of
         any existing, principal place of business.

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<PAGE>

         (e) Any other  matter  which has resulted or might result in a material
         adverse change in Borrower's or any Subsidiary's financial condition or
         business.

5.4 Financial  Statements.  Deliver to Bank or cause to be delivered to Bank, in
form and  detail  reasonably  satisfactory  to  Bank,  the  following  financial
information,  which  Borrower  warrants  shall be accurate  and  complete in all
material respects:

         (a) Interim  Financial  Statements.  As soon as available  but no later
         than  twenty-five  (25) days  after the end of each  month,  Borrower's
         consolidated  and  consolidating  balance  sheet  as of the end of such
         period, and Borrower's  consolidated and consolidating income statement
         for such period and for that portion of Borrower's  financial reporting
         year ending with such period,  prepared  and attested by a  responsible
         financial  officer of Borrower as being complete and correct and fairly
         presenting Borrower's financial condition and the results of Borrower's
         operations.

         (b) Year-End  Financial  Statements.  As soon as available but no later
         than one  hundred  twenty  (120)  days  after and as of the end of each
         financial  reporting  year, a complete copy of Borrower's  consolidated
         and  consolidating  audit report,  which shall include  balance  sheet,
         income statement,  statement of changes in equity and statement of cash
         flows for such year, prepared and certified by an independent certified
         public  accountant  selected by Borrower and  satisfactory to Bank (the
         "Accountant"). The Accountant's certification shall not be qualified or
         limited due to a restricted or limited examination by the Accountant of
         any  material   portion  of  Borrower's   records  or  otherwise.   The
         certification shall include, or be accompanied by, (i) a statement from
         the Accountant that during the examination  there was observed no Event
         of Default,  or a statement  of the Event of Default,  if any is found,
         and  (ii) a letter  from  the  Accountant  detailing  the  Accountant's
         conclusions  regarding  Borrower's  accounting policies and procedures,
         internal controls,  operating policies,  together with an evaluation of
         Borrower's present accounting system, citing problem areas, if any, and
         recommendations for improvement,  if any. Borrower shall not change its
         financial  reporting  year end from the current  December  31st without
         Bank's prior written consent.

         (c)  Quarterly  Compliance  Certificates.  On a  quarter-annual  basis,
         simultaneously  with the delivery of the financial  statements  for the
         months ending March 31, June 30,  September 30 and December 31 referred
         to in clause (a)  above,  and for the fiscal  year end  referred  to in
         clause (b)  above,  a  certificate  of the chief  financial  officer of
         Borrower  (i)  setting  forth in  reasonable  detail  any  calculations
         required to  establish  whether  Borrower  was in  compliance  with the
         requirements of Sections 5.2,  6.1(f),  6.4, 6.6 and 6.8 on the date of
         such financial  statements;  (ii) stating  whether any Event of Default
         exists  on the date of such  certificate  and if any  Event of  Default
         exists, setting forth the details thereof and the action which Borrower
         is taking or proposes to take with  respect  thereto;  and (iii) in the
         case of year-end financial statements under clause (b), a comparison of


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         ANIT for such  year-ended  and PNIT  for same  year as  required  under
         Section 2.4(c)(ii) of this Agreement.

         (d)  Government  Required  Reports.   Promptly  after  sending,  making
         available,  or filing,  copies of all reports,  proxy  statements,  and
         financial  statements  that  Borrower  sends or makes  available to its
         stockholders and all registration  statements and reports that Borrower
         files  with  the  Securities  and  Exchange  Commission,  or any  other
         governmental or regulatory  authority,  including Borrower's reports on
         forms 10-K and 10-Q.

         (e)  Financial  Projections.  As soon as  available,  but no later than
         December 31 of the prior year, a complete  copy of  Borrower's  annual,
         company-prepared  projections for the ensuing fiscal year,  which shall
         include a balance sheet, and statements of income and cash flow.

         (f) Accounts  Receivable  Agings.  No later than  twenty-five (25) days
         after   the  end  of  each   month,   statements   showing   aging  and
         reconciliation  of Accounts and collections,  and if requested by Bank,
         whenever  collections  on Accounts are delivered to Bank, a schedule of
         the  amounts  so  collected  and  delivered  as of the last day of such
         month.

         (g) Other  Information.  Such other  statements,  lists of property and
         accounts, budgets, forecasts, reports, or other information required by
         any  Addendum  to this  Agreement  or as  Bank  may  from  time to time
         reasonably request.

5.5 Existence. Maintain and preserve Borrower's and each Subsidiary's existence,
present form of business, and all rights, privileges and franchises necessary or
desirable  in the  normal  course of its  business;  except  that  Borrower  may
dissolve or merge into itself or another Subsidiary any Subsidiary that does not
have  significant  assets or  operations  as of the Closing  Date;  and keep all
Borrower's and each  Subsidiary's  property in good working order and condition,
ordinary wear and tear excepted.

5.6 Insurance. Maintain and keep in force insurance with companies acceptable to
Bank and in such amounts and types as is usual in the  businesses  carried on by
Borrower and each Subsidiary,  or as Bank may reasonably request. Such insurance
policies must be in form and substance satisfactory to Bank.

5.7 Accounting  Records.  Maintain  adequate  books,  accounts and records,  and
prepare all financial statements in accordance with GAAP, and in compliance with
the regulations of any governmental or regulatory  authority having jurisdiction
over Borrower or its  Subsidiaries or their  respective  businesses;  and permit
employees  or agents of Bank at such  reasonable  times as Bank may  request  to
inspect Borrower's and any Subsidiary's  properties,  and to examine, audit, and
make copies and memoranda of Borrower's books, accounts and records.

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<PAGE>

5.8 Compliance With Laws. Comply, and cause each Subsidiary to comply,  with all
laws,  rules,  regulations,   orders  and  directives  of  any  governmental  or
regulatory  authority having  jurisdiction  over Borrower or Subsidiary or their
respective  businesses,  and with all material  agreements to which  Borrower or
such Subsidiary is a party.

5.9 Taxes  and Other  Liabilities.  Pay or cause to be paid all  obligations  of
Borrower and each Subsidiary  when due; pay all taxes and other  governmental or
regulatory  assessments  before  delinquency  or  before  any  penalty  attaches
thereto,  except as may be contested in good faith by the appropriate procedures
and for which  Borrower  shall  maintain or cause to be  maintained  appropriate
reserves; and timely file all required tax returns.

                        ARTICLE SIX - NEGATIVE COVENANTS

During the term of this Agreement and until the  performance of all  obligations
to Bank,  Borrower  will not,  and will not permit any  Subsidiary  to,  without
Bank's prior written consent:

6.1 Indebtedness. Be indebted for borrowed money, the deferred purchase price of
property,  or leases which would be  capitalized  in  accordance  with GAAP;  or
become liable as a surety,  guarantor,  accommodation  party or otherwise for or
upon the obligation of any other Person, except:

         (a)      The acquisition of supplies or inventory on normal trade 
         credit, and equipment acquired in compliance with Section 6.8;

         (b)      The endorsement of negotiable instruments for deposit or 
         collection in the ordinary course of Borrower's business;

         (c)      The indebtedness of Borrower under this Agreement;

         (d)      Any indebtedness of Borrower and/or any Subsidiary (including
         OWT) approved in writing by Bank prior to the Closing Date;

         (e)      Any indebtedness of entities permitted to be acquired under
         Section 6.6; and

         (f)  Guaranties  not to exceed Five  Million  Dollars  ($5,000,000)  in
         aggregate  guaranteed  amount of indebtedness of OWT for borrowed 
         money or capitalized lease obligations.


6.2 Liens. Create, incur, assume or permit to exist any Lien, or grant any other
Person a negative  pledge,  on any of Borrower's or any  Subsidiary's  property,
except:

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<PAGE>

         (a)      Involuntary Liens which, in the aggregate, would not have a 
         material  adverse  effect on Borrower's or any  Subsidiary's  financial
         condition or business;

         (b)      Liens in favor of Bank;


         (c)      Liens on entities or properties permitted to be acquired 
         under Section 6.6;

         (d) Purchase money security  interests on any property held or acquired
         by Borrower or any  Subsidiary  in the ordinary  course of its business
         securing  Indebtedness incurred or assumed for the purpose of financing
         all or any part of the cost of acquiring such property;  provided, that
         such  Lien  attaches   solely  to  the  property   acquired  with  such
         Indebtedness  concurrently with or within 90 days after the acquisition
         thereof,  and that the aggregate  principal amount of such Indebtedness
         does not exceed the amount permitted under Section 6.8; and

         (e)      Permitted Liens.

Borrower and Bank agree that this covenant is not intended to constitute a lien,
deed of trust,  equitable  mortgage,  or security interest of any kind on any of
Borrower's or any  Subsidiary's  real property,  and this Agreement shall not be
recorded or recordable.  Notwithstanding  the foregoing,  however,  violation of
this covenant by Borrower shall constitute an Event of Default.

6.3 Borrower  Dividends;  Subsidiary  Dividends.  Pay any dividends except those
payable  solely  in  Borrower's  capital  stock;  redeem,  purchase,  retire  or
otherwise  acquire any shares of any class of capital  stock of  Borrower  for a
price in excess of One Million Dollars ($1,000,000) in aggregate;otherwise  make
any other distribution with respect to any of Borrower's capital stock; provided
that so long as no Event of Default  has  occurred  and is  continuing  or would
result therefrom,  Borrower may repurchase equity securities of Borrower from an
employee upon termination of employment if permitted under an agreement  between
such  employee  and  Borrower.  Borrower  will  not,  and  will not  permit  any
Subsidiary to, directly or indirectly, create or suffer to exist any encumbrance
or  restriction  on the ability of any such  Subsidiary to pay dividends or make
any other  distributions  to Borrower on its capital stock or any other interest
or  participation  in its  profits  owned by  Borrower,  or pay any debt owed to
Borrower, except for encumbrances or restrictions existing under or by reason of
applicable law, this Agreement or any other Loan Documents.

6.4  Changes/Mergers.  Change its name  without  giving at least 30 days'  prior
notice to Bank; liquidate or dissolve,  or enter into any consolidation,  merger
(other than a merger effected for the sole purpose of  reincorporating  Borrower
in another  jurisdiction),  partnership,  joint  venture  or other  combination;
reorganize,   reclassify  or   recapitalize   its  capital  stock;   prepay  any


                                      107
<PAGE>

subordinated  debt,  debt for borrowed  money,  or debt secured by any permitted
Lien,  or enter into or modify any  agreement  as a result of which the terms of
payment of any such debt are modified in excess of Five Hundred Thousand Dollars
($500,000)  in aggregate.  Borrower will not permit any  Subsidiary to issue any
shares of its  capital  stock to any  Person  other  than  Borrower,  except any
Subsidiary  may issue shares of capital  stock or options  exercisable  for such
stock  in  an  aggregate  amount  not  to  exceed  ten  percent  (10%)  of  such
Subsidiary's  outstanding  capital stock (on a fully diluted basis) to directors
and/or   employees  under  one  or  more  incentive  stock  option  or  deferred
compensation plans that may be in effect from time to time.

6.5 Sales of Assets.  Sell,  transfer,  lease or otherwise dispose of any of its
assets except for fair consideration and in the ordinary course of its business,
and except for dispositions of equipment that has become obsolete; or enter into
any sale or  leaseback  agreement  covering  any of its fixed or capital  assets
except to the extent permitted under Section 6.8;  provided,  however,  that the
assets of Yolo  Landfill  Gas  Corporation  (consisting  primarily  of leasehold
rights and inground  pipelines) may be sold under a proposal in existence of the
Closing Date for consideration of not less than $800,000.00.

6.6 Acquisitions. Acquire or purchase all or substantially all the assets of any
other Person; or enter into any partnership, joint venture or other combination;
or acquire or purchase  securities (each an  "Acquisition"  and collectively the
"Acquisitions"), except:

         (a)      Those permitted under Section 6.7;

         (b)      The OWT Acquisition;

         (c)      Any single Acquisition in any amount not to exceed the sum of
         $3,000,000.00 in cash; or

         (d)   Acquisitions   not  to  exceed  in  the   aggregate  the  sum  of
         $5,000,000.00  in cash,  and/or  securities  or  otherwise,  during any
         financial reporting year of Borrower.

6.7      Loans/Investments.  Make or suffer to exist any loans, advances, or 
investments, except:

         (a)      Bank accounts in the ordinary course of its business;

         (b)      Accounts receivable in the ordinary course of its business;

         (c) (i) Investments in domestic  certificates of deposit issued by, and
         other  domestic  deposit  investments  with,   financial   institutions
         organized  under  the laws of the  United  States  or a state  thereof,
         maintaining  capital of at least $100  million and a rating of at least
         Aa by Moody's or any successor rating agency;

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<PAGE>

                  (ii) banker's  acceptances  created by, and  commercial  paper
         issued  by,  in  each  case,   domestic  or  foreign  commercial  banks
         maintaining  capital of at least $100  million and carrying a rating of
         at least A1 or P1 by Moody's, Standard & Poor's or any successor rating
         agency;

         (d)  Investments  in short term  marketable  obligations  of the United
         States of America and in open market commercial paper given the highest
         credit  rating by a national  credit  agency and maturing not more than
         one year from the creation thereof;

         (e)      Securities of the United States Government;

         (f) Bonds issued by any domestic governmental agency or instrumentality
         and  bearing the highest  bond rating  category of Moody's,  Standard &
         Poor's or any successor rating agency;

         (g) Demand notes,  money market  preferred  shares and adjustable  rate
         preferred  shares of any entity whose debt obligations are rated in the
         highest  bond  rating  category  of  Moody's,  Standard & Poor's or any
         successor rating agency;

         (h) Loans to Management Stakeholders (as defined in the OWT Acquisition
         documents) not to exceed $800,000.00 in aggregate  principal amount for
         the sole purpose of financing such persons'  payment of federal,  state
         and local income tax liabilities arising from Borrower's acquisition of
         such persons'  equity  interests in OWT in exchange for OWT Convertible
         Notes; and

         (i) Temporary  advances to cover incidental  expenses to be incurred in
         the ordinary course of business.

6.8 Limitation on Capital Expenditures/Leases. Expend or be committed to expend,
on a  consolidated  basis,  Six  Million  Dollars  ($6,000,000)  or  more in the
aggregate for the  acquisition,lease  or rental of gross fixed or capital assets
during any financial reporting year.

6.9  Transactions  With Related  Persons.  Directly or indirectly enter into any
transaction  with or for the benefit of a Related Person on terms more favorable
to the  Related  Person  than would have been  obtainable  in an "arms'  length"
dealing.

6.10 Other Business. Conduct any business other than the businesses conducted by
Borrower and  Subsidiaries  as of the Closing Date,  unless the revenues  and/or
expenses  of such  business  would not  constitute  a  material  portion  of the
consolidated revenues or expenses of Borrower and all Subsidiaries.

                                      109
<PAGE>

6.11 Termination of Key Personnel.  Permit any individual who is the head of any
major  division of Borrower or any material  Subsidiary  to terminate his or her
employment on a substantially  full-time basis; provided,  however, that if such
event is  anticipated or occurs,  Borrower  shall  promptly  notify Bank of such
event, and provide a reasonably  detailed analysis of the anticipated  effect of
the  departure  of such  person on the  consolidated  operations  and  financial
condition of Borrower,  and the steps,  if any,  being taken,  or proposed to be
taken,  by Borrower in response to such  departure.  So long as the departure of
such  employee  is not likely to have a material  adverse  effect on  Borrower's
financial  condition or ability to repay the Facilities,  and Borrower continues
to diligently  prosecute any action proposed to be taken,  then the departure of
such individual shall not be deemed a violation of this Section 6.11.


                        ARTICLE SEVEN - EVENTS OF DEFAULT

7.1  Events  of  Default.  The  occurrence  of any of the  following  shall  (1)
terminate any obligation of Bank to make or continue the Facilities;  and shall,
at Bank's option, (2) make all sums of interest, principal and any other amounts
owing  under any Loan  Documents  immediately  due and  payable  (with Bank also
having  immediate  right to full cash  prepayment  for the unpaid amounts of all
outstanding Letters of Credit) without notice of default,  presentment or demand
for payment, protest or notice of nonpayment or dishonor or any other notices or
demands;  and (3) give Bank the  right to  exercise  any  other  right or remedy
provided by contract or applicable law:

         (a)  Borrower  shall fail to make any payment of  principal or interest
         when due under this  Agreement or to pay any fees or other charges when
         due.

         (b) Borrower shall fail to perform or observe any covenant contained in
         Sections 5.1, 5.2, 5.4(a)-(c), 5.7 or Article 6, inclusive.

         (c)  Borrower or any other  Person shall fail to perform or observe any
         covenant or agreement  contained in this Agreement or in any other Loan
         Document (other than those covered by clause (a) or (b) above) and such
         failure continues for thirty (30) or more days.

         (d) Any  representation  or  warranty  made,  or  financial  statement,
         certificate or other document  provided,  by Borrower or any Subsidiary
         shall prove to have been  materially  false or misleading when made (or
         deemed made).

         (e) Borrower or any Subsidiary shall fail to pay its debts generally as
         they become due or shall file any  petition or action for relief  under
         any  bankruptcy,  insolvency,   reorganization,   moratorium,  creditor
         composition  law,  or any other law for the  relief of or  relating  to
         debtors;  an  involuntary  petition shall be filed under any bankruptcy
         law  against  Borrower or any  Subsidiary,  or a  custodian,  receiver,


                                      110
<PAGE>

         trustee,  assignee  for the  benefit  of  creditors,  or other  similar
         official, shall be appointed to take possession,  custody or control of
         the properties of Borrower or any Subsidiary.

         (f) Borrower or any  Subsidiary  shall fail to perform  under any other
         agreement  involving the borrowing of money,  the purchase of property,
         the advance of credit or any other  monetary  liability  of any kind to
         Bank or to any Person  where the  failure  would  permit such Person to
         accelerate such obligation or indebtedness.

         (g) Any governmental or regulatory authority shall take any action, any
         defined  benefit  pension plan maintained by Borrower or any Subsidiary
         shall have any  unfunded  liabilities,  or any other event shall occur,
         any of which,  in the judgment of Bank,  might have a material  adverse
         effect on the  financial  condition  or  business  of  Borrower  or any
         Subsidiary.

         (h) Any sale,  transfer or other disposition of all or a substantial or
         material  part of the assets of Borrower or any  Subsidiary,  including
         without limitation to any trust or similar entity, shall occur.

         (i) Any Person shall fail to perform its obligations under the terms of
         any material promissory note, contract or other obligation that is held
         by Bank  as  collateral  for  the  obligations  evidenced  by the  Loan
         Documents;  or Bank shall not have a perfected security interest in any
         collateral  being  held  for  the  obligations  evidenced  by the  Loan
         Documents.

         (j)  Any  judgment(s)   shall  be  entered  against   Borrower  or  any
         Subsidiary,  or any involuntary  lien(s) of any kind or character shall
         attach to any assets or property of Borrower or any Subsidiary,  any of
         which, in the judgment of Bank, might have a material adverse effect on
         the financial condition or business of Borrower or any Subsidiary.

                       ARTICLE EIGHT - GENERAL PROVISIONS

8.1 Notices.  Any notice given by any party under any Loan Document  shall be in
writing and personally  delivered,  sent by United States mail, postage prepaid,
or sent by  facsimile  or  other  authenticated  message,  charges  prepaid  and
addressed as follows:

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<PAGE>

To Borrower:                                         To Bank:

EMCON                                       The Bank of California, N.A.
400 South El Camino Real                    San Mateo Regional Office
Suite 1200                                  491 South El Camino Real
San Mateo, CA  94402                        San Mateo, CA  94402
Attn:  R. Michael Momboisse, CFO            Attn:  Marie T. Wiseman, V.P.
FAX No.:  415/375-0763                      FAX No.:  415/548-1998


Notices shall be deemed given three days after deposit in U.S. mail, on the next
business day if sent by overnight  courier,  and on the date of dispatch if sent
by  facsimile  or hand  delivery.  Each party may  change  the  address to which
notices,  requests  and other  communications  are to be sent by giving  written
notice of such change to each other party.

8.2      Dispute Resolution.

         (a) Mandatory  Mediation/Arbitration.  Any controversy or claim between
         or among the parties, their agents, employees and affiliates, including
         but not limited to those  arising out of or relating to this  Agreement
         or  any  related  agreements  or  instruments  ("Subject   Documents"),
         including  without  limitation  any claim  based on or arising  from an
         alleged tort,  shall,  at the option of any party,  and at that party's
         expense,   be  submitted  to  mediation,   using  either  the  American
         Arbitration  Association ("AAA") or Judicial  Arbitration and Mediation
         Services, Inc. ("JAMS"). If mediation is not used, or if it is used and
         it fails to  resolve  the  dispute  within 30 days from the date AAA or
         JAMS is engaged, then the dispute shall be determined by arbitration in
         accordance  with the rules of either  JAMS or AAA (at the option of the
         party  initiating  the  arbitration)  and  Title 9 of the U.  S.  Code,
         notwithstanding  any  other  choice  of law  provision  in the  Subject
         Documents.  All statutes of limitations or any waivers contained herein
         which would  otherwise  be  applicable  shall apply to any  arbitration
         proceeding under this  subparagraph (a). The parties agree that related
         arbitration  proceedings  may be  consolidated.  The  arbitrator  shall
         prepare written reasons for the award. Judgment upon the award rendered
         may be entered in any court having jurisdiction.  This subparagraph (a)
         shall apply only if, at the time of the proposed  submission  to AAA or
         JAMS, none of the obligations to Bank described in or covered by any of
         the Subject Documents are secured by real property collateral or, if so
         secured, all parties consent to such submission.

         (b) Jury Waiver/Judicial  Reference. If the controversy or claim is not
         submitted to arbitration as provided and limited in  subparagraph  (a),
         but becomes the subject of a judicial action,  each party hereby waives
         its respective  right to trial by jury of the  controversy or claim. In
         addition,  any party may  elect to have all  decisions  of fact and law


                                      112
<PAGE>

         determined  by a  referee  appointed  by the court in  accordance  with
         applicable  state  reference  procedures.   The  party  requesting  the
         reference procedure shall ask AAA or JAMS to provide a panel of retired
         judges and the court  shall  select  the  referee  from the  designated
         panel.   The  referee  shall  prepare  written  findings  of  fact  and
         conclusions  of law.  Judgment upon the award rendered shall be entered
         in the court in which such proceeding was commenced.

         (c) Provisional Remedies, Self Help, and Foreclosure.  No provision of,
         or the exercise of any rights under,  subparagraph  (a) shall limit the
         right of any party to exercise self help  remedies  such as setoff,  to
         foreclose  against  any real or  personal  property  collateral,  or to
         obtain  provisional or ancillary  remedies such as injunctive relief or
         the appointment of a receiver from a court having jurisdiction  before,
         during or after the pendency of any mediation or arbitration. At Bank's
         option,   foreclosure  under  a  deed  of  trust  or  mortgage  may  be
         accomplished  either  by  exercise  of power of sale  under the deed of
         trust or mortgage,  or by judicial  foreclosure.  The  institution  and
         maintenance of an action for judicial  relief or pursuit of provisional
         or  ancillary  remedies  or exercise  of self help  remedies  shall not
         constitute a waiver of the right of any party, including the plaintiff,
         to submit the controversy or claim to mediation or arbitration.

To the extent any provision of the dispute  resolution  clause is different than
the terms of this Agreement,  the terms of this dispute  resolution clause shall
prevail.

8.3 Binding  Effect.  The Loan Documents  shall be binding upon and inure to the
benefit  of  Borrower  and Bank and  their  successors  and  assigns;  provided,
however,  that  Borrower  may  not  assign  or  transfer  Borrower's  rights  or
obligations  under any Loan Document without Bank's prior written consent.  Bank
reserves the right to sell, assign, transfer,  negotiate or grant participations
in all or any part of, or any interest in, Bank's rights and  obligations  under
the Loan  Documents;  provided,  that Bank will not  knowingly do so to a Person
that is a non-bank lender that is directly or indirectly in competition with the
business of, or a customer of, Borrower.  In that connection,  Bank may disclose
all documents and  information  which Bank now or hereafter may have relating to
the Facilities,  Borrower, or any Subsidiary or their business;  provided,  that
any such  assignee  or  transferee  has  executed  a  confidentiality  agreement
reasonably satisfactory to Borrower.

8.4 No Waiver.  Any waiver,  consent or approval by Bank of any Event of Default
or breach of any provision,  condition, or covenant of any Loan Document must be
in writing and shall be  effective  only to the extent set forth in writing.  No
waiver of any breach or default  shall be deemed a waiver of any later breach or
default of the same or any other  provision of any Loan Document.  No failure or
delay on the part of Bank in exercising any power, right, or privilege under any
Loan  Document  shall  operate  as a waiver  thereof,  and no single or  partial
exercise of any such power,  right,  or  privilege  shall  preclude  any further
exercise  thereof or the exercise of any other power,  right or privilege.  Bank
has the right at its sole option to continue to accept interest and/or principal


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payments due under the Loan Documents after default,  and such acceptance  shall
not constitute a waiver of said default or an extension of the Termination  Date
unless Bank agrees otherwise in writing.

8.5      Rights Cumulative.  All rights and remedies existing under the Loan 
Documents are  cumulative to, and not exclusive of, any other rights or remedies
available under contract or applicable law.

8.6  Unenforceable  Provisions.  Any provision of any Loan Document  executed by
Borrower which is prohibited or unenforceable in any  jurisdiction,  shall be so
only as to such  jurisdiction  and only to the  extent  of such  prohibition  or
unenforceability,  but all the  remaining  provisions  of any such Loan Document
shall remain valid and enforceable.

8.7      Governing Law.  Except as may be otherwise expressly stated therein, 
the Loan  Documents  shall be governed by and construed in accordance  with, the
laws of the State of California.

8.8      Accounting Terms.  Except as otherwise provided in this Agreement, 
accounting terms and financial covenants and information shall be determined and
prepared in accordance with GAAP as in effect on the date of this Agreement.

8.9 Indemnification.  Borrower shall pay and protect,  defend and indemnify Bank
and   Bank's   employees,   officers,   directors,   shareholders,   affiliates,
correspondents,  agents  and  representatives  (other  than  Bank,  collectively
"Agents") against,  and hold Bank and each such Agent harmless from, all claims,
actions,  proceedings,   liabilities,  damages,  losses,  and  related  expenses
(including, without limitation,  reasonable attorneys' fees and costs) and other
amounts  incurred  by Bank and each such  Agent,  arising  from (i) the  matters
contemplated  by this  Agreement,  any Loan  Document or any Letter of Credit or
(ii) any  contention  that  Borrower  has failed to comply  with any law,  rule,
regulation,  order or  directive  applicable  to  Borrower's  sales,  leases  or
performance of services to Borrower's  customers,  including without  limitation
those  sales,  leases and  services  requiring  consumer  or other  disclosures;
provided,  however,  that  this  indemnification  shall  not apply to any of the
foregoing  incurred  solely  as  the  result  of  Bank's  or any  Agent's  gross
negligence or willful misconduct. This indemnification shall survive the payment
and satisfaction of all of Borrower's obligations and liabilities to Bank.

8.10  Reimbursement.  Borrower shall  reimburse Bank for all costs and expenses,
including without limitation  reasonable  attorneys' fees and disbursements (and
fees and  disbursements of Bank's in-house counsel) expended or incurred by Bank
in any arbitration,  mediation, judicial reference, legal action or otherwise in
connection with (a) the negotiation,  preparation, amendment, interpretation and
enforcement  of the Loan  Documents,  including  without  limitation  during any
workout,  attempted  workout,  and/or in connection  with the rendering of legal
advice as to Bank's rights,  remedies and obligations  under the Loan Documents,
(b) collecting  any sum which becomes due Bank under any Loan Document,  (c) any


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proceeding for declaratory  relief,  any counterclaim to any proceeding,  or any
appeal,  or (d) the  protection,  preservation  or  enforcement of any rights of
Bank. For the purposes of this section,  attorneys' fees shall include,  without
limitation,  fees  incurred  in  connection  with the  following:  (1)  contempt
proceedings;  (2) discovery; (3) any motion, proceeding or other activity of any
kind in  connection  with a  bankruptcy  proceeding  or case  arising  out of or
relating to any petition  under Title 11 of the United  States Code, as the same
shall be in effect from time to time, or any similar law; (4) garnishment, levy,
and  debtor and third  party  examinations;  and (5)  postjudgment  motions  and
proceedings  of any kind,  including  without  limitation  any activity taken to
collect or enforce any judgment.

8.11 Execution in Counterparts.  This Agreement may be executed in any number of
counterparts which, when taken together, shall constitute but one agreement.

8.12 Entire  Agreement.  The Loan  Documents  are intended by the parties as the
final  expression of their agreement and therefore  contain the entire agreement
between  the  parties  and  supersede  all prior  understandings  or  agreements
concerning the subject  matter  hereof.  This Agreement may be amended only in a
writing signed by Borrower and Bank.

IN WITNESS  WHEREOF,  Borrower and Bank have executed  this  Agreement as of the
date set forth in the preamble.

EMCON, a California corporation             THE BANK OF CALIFORNIA, N.A.


By:    /s/                                  By:     /s/
       ----------------------                       -------------------
Name:  R. Michael Momboisse                 Name:   Marie T. Wiseman
Title:  CFO and V.P. - Legal                Title:  Vice President

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<PAGE>


                                  EXHIBIT 10.3

                               SECURITY AGREEMENT


          This  Agreement is made as of February 29, 1996 by EMCON, a California
corporation ("Debtor"), in favor of THE BANK OF CALIFORNIA, N.A. ("Bank").

                                    Recitals

          Debtor  and Bank  have  executed  a  Credit  Agreement  of even  dated
herewith  (as the same may be amended  or  supplemented  from time to time,  the
"Credit Agreement"),  pursuant to which Bank has agreed to extend certain credit
facilities to Borrower on the  condition,  among others,  that Borrower grant to
Bank a  continuing  security  interest in certain  now owned and  after-acquired
personal  property of Borrower as security for Borrower's  obligations under the
Credit  Agreement.  All  capitalized  terms used in this  Agreement that are not
otherwise  defined herein shall have the meanings ascribed thereto in the Credit
Agreement.


                             ARTICLE 1 - DEFINITIONS

          The following definitions shall be applicable to both the singular and
plural forms of the defined terms:

                 "Account"  means a right to payment for goods sold or leased by
Debtor or for services  rendered by Debtor,  which right is not  evidenced by an
instrument or chattel paper, whether or not earned by performance.

                 "Agreement" means this Security Agreement, as it may be amended
from time to time.

                 "Collateral"  means all Debtor's  Accounts,  Deposit  Accounts,
Equipment, Fixtures, General Intangibles, Goods, Inventory and Rights to Payment
now owned or hereafter acquired, wherever located, and whether held by Debtor or
any third party, and all royalties, proceeds and products thereof, including all
insurance and condemnation proceeds ("Proceeds"),  and all Records. "Collateral"
shall  include the separate  property of any married  individual  who signs this
Agreement if such property is otherwise covered by this definition.

                  "Deposit Accounts" means all Debtor's demand,  time,  savings,
passbook or similar accounts  maintained with a financial  institution or credit
union, other than accounts evidenced by a negotiable certificate of deposit.

                  "Equipment"  means  all of  Debtor's  equipment  now  owned or
hereafter  acquired,  including  but not limited to  machinery,  machine  parts,
furniture,  furnishings and all tangible  personal property used in the business


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of  Debtor  and all such  property  which is or is to  become  fixtures  on real
property, and all improvements,  replacements, accessions and additions thereto,
wherever located,  and all proceeds thereof arising from the sale, lease, rental
or other  use or  disposition  of any such  property,  including  all  rights to
payment with respect to insurance or  condemnation,  returned  premiums,  or any
cause of action relating to any of the foregoing.

                  "Event of Default" means an event described in Article 6.

                  "Fixtures" means all items of personal property of Debtor that
are so related to the real property upon which they are located that an interest
in them arises under real property law, and improvements,  replacements,  parts,
accessions and additions thereto, and substitutions therefor.

                  "General  Intangibles"  means all personal property of Debtor,
other than  Goods,  not  otherwise  defined  as  Collateral,  including  without
limitation  all interests or claims in insurance  policies;  literary  property;
tradenames, tradename rights; trademarks, trademark rights, copyrights, patents,
and all applications therefor; licenses, permits, franchises and like privileges
or  rights  issued by any  governmental  or  regulatory  authority;  income  tax
refunds;  customer lists;  claims and causes of action and all guaranty  claims,
co-op memberships,  leasehold interests in personal property, security interests
or other  security  held by or guaranteed to the Debtor to secure the payment by
an account debtor of any of the Accounts.

                  "Goods" means all money and other personal property of Debtor,
other than General Intangibles, not otherwise defined as Collateral.

                  "Indebtedness" means all debts, obligations and liabilities of
Debtor to Bank currently existing or now or hereafter made, incurred or created,
whether  voluntary or  involuntary  and however  arising or  evidenced,  whether
direct or acquired by Bank by assignment or succession,  whether due or not due,
absolute or contingent, liquidated or unliquidated,  determined or undetermined,
and whether Debtor may be liable  individually or jointly,  or whether  recovery
upon  such  debt may be or  become  barred  by any  statute  of  limitations  or
otherwise unenforceable; and all renewals, extensions and modifications thereof;
and all  attorneys'  fees and  costs  incurred  by Bank in  connection  with the
collection and enforcement thereof.

                  "Inventory" means all Debtor's raw materials, work in process,
finished goods and goods held for sale or lease or furnished  under contracts of
service,  and all  returned  and  repossessed  goods,  and all goods  covered by
documents of title, including warehouse receipts,  bills of lading and all other
documents of every type covering all or any part of the Collateral.

                  "Lien" means any voluntary or involuntary  security  interest,
mortgage,  pledge,  claim, charge,  encumbrance,  title retention agreement,  or
third party  interest  covering all or any part of the property of Debtor or any
other Person.

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<PAGE>

                  "Loan  Documents"  means  this  Agreement,   any  evidence  of
Indebtedness, any guaranty, security or pledge agreement, deed of trust, and all
other  contracts,  instruments,  addenda and  documents  executed in  connection
therewith.

                  "Person"  means any  individual or entity,  including  without
limitation Bank where the context so permits and in Bank's sole discretion.

                  "Records"  means all  Debtor's  computer  programs,  software,
hardware,  source codes and data processing information,  all written documents,
books, invoices,  ledger sheets,  financial information and statements,  and all
other writings concerning Debtor's business.

                  "Rights to Payment" means all Debtor's accounts,  instruments,
contract  rights,  documents,  chattel  paper and all other  rights to  payment,
including  without  limitation  the Accounts,  all  negotiable  certificates  of
deposit  and all rights to payment  under any  commercial  or standby  letter of
credit.

                  "Uniform Commercial Code" means the Uniform Commercial Code of
the State referred to in Article Eight, as amended from time to time.

Terms not specifically defined in this Agreement have the meanings proscribed in
the Uniform Commercial Code.

                     ARTICLE 2 - GRANT OF SECURITY INTEREST

                 To  secure  the  timely   payment  of  the   Indebtedness   and
performance  of all  obligations  of  Debtor  to Bank,  Debtor  grants to Bank a
security interest in the Collateral.

                   ARTICLE 3 - REPRESENTATIONS AND WARRANTIES

                 Debtor  represents  and warrants  that, at all times during the
term of this Agreement:

                 3.1 Authorization,  Validity and Enforceability. The execution,
delivery and performance of this Agreement are within Debtor's powers, have been
duly authorized, and are not in conflict with Debtor's articles of incorporation
or  by-laws,  or the terms of any  charter or other  organizational  document of
Debtor; and this Agreement constitutes a valid and binding obligation of Debtor,
enforceable in accordance with its terms, and creates a security  interest which
is enforceable against the Collateral.

                 3.2 No Conflict.  The execution,  delivery,  and performance by
Debtor of this  Agreement  are not in conflict with any law,  rule,  regulation,
order or directive, or any indenture,  agreement, or undertaking to which Debtor
is a party or by which  Debtor may be bound or  affected  and will not result in


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<PAGE>

the  creation  or  imposition  of any  Lien  pursuant  to the  terms of any such
indenture, agreement, or undertaking.

                 3.3 Governmental Actions.  Debtor has obtained all consents and
actions of, and has performed all filings with, any  governmental  or regulatory
authority that are required to authorize the execution,  delivery or performance
of this Agreement or the granting or perfecting of Bank's  security  interest in
the Collateral.

                 3.4 Title.  Except as permitted under Section 6.2 of the Credit
Agreement, Debtor is and will be the unconditional legal and beneficial owner of
the Collateral, and the Collateral is genuine and subject to no Liens, rights or
defenses of others. Except for Inventory under documents duly negotiated to Bank
or showing Bank as secured party, no bill of lading,  warehouse receipt or other
document of title is outstanding with respect to any of the Collateral.

                 3.5 Rights to Payment. The names of the obligors,  amount owing
to Debtor,  due dates and all other  information  with  respect to the Rights to
Payment are and will be correctly  stated in all Records  relating to the Rights
to Payment. Debtor further represents and warrants that each Person appearing to
be obligated on a Right to Payment has authority and capacity to contract and is
bound as it appears to be; and that all chattel paper is in compliance  with law
as to form,  content and manner of  preparation  and  execution and all property
subject  to  chattel  paper has been  properly  registered  and filed to perfect
Debtor's interest.

                 3.6 Retail Merchant. Bank's security interest in any Collateral
consisting  of Inventory is not  restricted by Uniform  Commercial  Code Section
9102 in effect from time to time.

                 3.7  No  Misrepresentation.   No  representation,  warranty  or
statement by Debtor contained in this Agreement, in any Record or certificate or
other writing furnished by Debtor to Bank (including without limitation any made
or given  concerning  the  genuineness,  value and condition of the  Collateral,
financial statements and statements made in documentary  Collateral) at any time
contains  any untrue  statement of material  fact,  or omits to state a material
fact.

                 3.8 Chief Executive Office.  Debtor's chief executive office is
located at:

        Address              City             County         State        Zip
       --------              ----             ------         -----        ---

400 South El Camino Real
         Suite 1200        San Mateo         San Mateo         CA      94402


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<PAGE>




                 3.9 Inventory Location. Other than as set forth in Section 3.8,
Inventory is located at:

        Address              City             County         State        Zip
       --------              ----             ------         -----        --- 

         See Schedule 3.9 attached hereto.




                 3.10 Records Location.  Other than as set forth in Section 3.8,
Records are maintained at:

        Address              City             County         State        Zip
       --------              ----             ------         -----        --- 
         See Schedule 3.9 attached hereto.




                 3.11 Equipment or Fixtures Location. Other than as set forth in
Section 3.8, Equipment or Fixtures are located at:

        Address              City             County         State        Zip
       --------              ----             ------         -----        ---

         See Schedule 3.9 attached hereto.




                 3.12 Other Places of Business. In addition to the locations set
forth in Sections 3.8 through 3.11,  Debtor maintains the following  place(s) of
business:

        Address              City             County         State        Zip
       --------              ----             ------         -----        ---
         See Schedule 3.9 attached hereto.



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<PAGE>


                 3.13  Business  Names.  Debtor has  conducted  business  in the
following names other than the name stated in the preamble to this Agreement:

                                   EMCON, Inc.
                             EMCON Consulting, Inc.
                                EMCON Associates
                              EMCON Southwest, Inc.
                              EMCON Northwest, Inc.
                              EMCON Southeast, Inc.
                           EMCON Baker-Shiflett, Inc.
                           Baker-Shiflett/EMCON, Inc.
                              Baker-Shiflett, Inc.
                                Texas EMCON, Inc.
                            Sweet Edwards/EMCON, Inc.
                               Sweet Edwards, Inc.
                             GWL Environmental, Inc.
                              G. Warren Levy, Inc.
                      Special Environmental Services, Inc.
                  Chattahoochie Geotechnical Consultants, Inc.
                          Wehran/EMCON Northeast, Inc.
                             Wehran Envirotech, Inc.
                         Wehran Engineering Corporation
                       Wehran Technological Services, Inc.
                           Wecon Services Corporation
                      Eldredge Engineering Associates, Inc.
                           Aquila Construction Company
                           Resource Recovery Services
                               Aquila Construction
                         EMCON/United Field Services LLC
                              Wehran-New York Inc.
                               Wehran Puerto Rico
                             ET Environmental Corp.
                             Yolo Landfill Gas Corp.
                        Monterey Landfill Gas Corporation
                        Columbia Analytical Services Inc.
                             Performance Analytical
                          ET Environmental Corporation
                                 EOC Corporation

                 3.14  No  Litigation.   There  is  no  litigation,  tax  claim,
proceeding or dispute pending, or to the knowledge of Debtor, threatened against
or  affecting  Debtor or its  property,  except as  disclosed in writing to Bank
prior to the date of this Agreement.

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                 3.15 Financing  Statements.  Copies of all financing statements
and all other  documents  publicly  recorded or filed naming Debtor as debtor or
obligor have been delivered to Bank prior to the date of this Agreement.

                 3.16 Hazardous Substances. Except in compliance with applicable
laws,  Debtor's  property  never  has  been,  and  never  will be,  used for the
generation,  manufacture,  storage,  treatment,  disposal, release or threatened
release of any hazardous substance, as those or any similar terms are defined in
the  Comprehensive  Environmental  Response,  Compensation  and Liability Act of
1980, as amended,  42 U.S.C.  Section 9601, et seq.  ("CERCLA")  any  regulation
promulgated  thereunder,  or any state or local law, rule,  regulation or order.
Debtor  hereby  agrees to indemnify  and hold  harmless Bank against any and all
claims and losses resulting from a breach of this provision.

                 3.17 No Default. No Event of Default has occurred or exists.

                        ARTICLE 4 - AFFIRMATIVE COVENANTS

                 During the term of this  Agreement and until payment of all the
Indebtedness  and  performance  of  all  obligations  to  Bank  under  the  Loan
Documents, Debtor will, unless Bank otherwise consents in writing:

                  4.1 Use of Proceeds.  Use the proceeds of any credit  extended
by Bank to  Debtor  only in  accordance  with the terms of any  evidence  of the
Indebtedness and for the purpose indicated on any application for such credit.

                 4.2  Delivery of Certain  Items.  Deliver to Bank  promptly (a)
upon Bank's  request,  duplicate  invoices with respect to each Account  bearing
such  language of  assignment  as Bank shall  specify;  (b) the originals of all
commercial  and standby  letters of credit,  instruments,  documents and chattel
paper constituting Collateral,  endorsed and assigned as Bank shall specify; (c)
after an Event of  Default,  all  Proceeds;  (d) upon Bank's  request,  returned
property resulting from, or payment equal to such allowance or credit on, Rights
to Payment; (e) such specific  acknowledgments,  assignments or other agreements
as Bank may request  relating to the Collateral;  and (f) such Records and other
reports in such form and detail and at such times as Bank may  require  relating
to the Collateral,  including  without  limitation  reports of acquisition,  and
disposition,  agings, and collection of any Collateral.  If any of the Rights to
Payment become evidenced by an instrument,  Debtor will notify Bank thereof and,
upon request by Bank  promptly  deliver such  instrument  to Bank  appropriately
endorsed to the order of Bank as further  security for the  satisfaction in full
of the Indebtedness.

                 4.3  Maintenance  of  Collateral;  Inspection.  Do  all  things
necessary to maintain, preserve, protect and keep all Collateral in good working


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order and salable  condition,  dealing  with the  Collateral  in all ways as are
considered  good  practice by owners of like  property,  and use the  Collateral
lawfully and only as permitted by Debtor's  insurance  policies.  Debtor  hereby
authorizes Bank's officers, employees, representatives and agents to inspect the
Collateral and to discuss the Collateral and the Records  relating  thereto with
Debtor's officers and employees,  and, in the case of any Right to Payment after
the  occurrence  of an Event of  Default,  with  any  Person  which is or may be
obligated thereon.

                 4.4 Maintenance of Records;  Inspection.  Maintain, or cause to
be maintained,  complete and accurate Records relating to the Collateral.  Bank,
its officers,  employees,  agents and representatives shall have the right, from
time to time, to examine the Records and to make copies or extracts therefrom.

                  4.5 Insurance.  Maintain and keep in force in adequate amounts
such insurance on the Collateral  with companies  acceptable to Bank as is usual
in the  business  carried on by Debtor,  including  fire and  extended  coverage
insurance,  with loss payable to Bank, as Bank may from time to time  reasonably
request.  Furnish  to  Bank  upon  request  the  original  of all  policies,  or
certificates  of insurance on the  Collateral.  Each policy shall be in form and
substance satisfactory to Bank.

                 4.6 Taxes and Other Liabilities.  Pay all Debtor's  obligations
when due; pay all taxes and other governmental or regulatory  assessments before
delinquency or before any penalty attaches  thereto,  except as may be contested
in good faith by the appropriate  procedures and for which Debtor shall maintain
appropriate  reserves;  and timely  file all  required  tax  returns.  Any taxes
(excluding  income  taxes)  payable  or ruled  payable  by any  governmental  or
regulatory  authority  arising out of or in connection with this Agreement shall
be paid by Debtor, together with interest and penalties, if any.

                 4.7 Debtor's  Duty to Give Notice.  Give prompt  notice to Bank
of: (a) any material discount,  credit,  rebate or other reduction in the amount
owing on a Right to Payment;  (b) any material  threatened or asserted  dispute,
setoff,  claim,  counterclaim or defense with respect to a Right to Payment; (c)
any  material  decrease  in the value of any  Collateral  and the amount of such
decrease (other than depreciation  calculated in the ordinary course of business
under  applicable  tax laws and  regulations  and in accordance  with  generally
accepted  accounting  principles);  and(d)  any change in the  ownership  of any
property on which any Collateral is located.

                 4.8 Financing Statements and Other Actions. Execute and deliver
to Bank,  and file or record at  Debtor's  expense,  all  financing  statements,
notices and other  documents  from time to time  requested by Bank to maintain a
first  perfected  security  interest in the  Collateral in favor of Bank, all in
form and substance  satisfactory  to Bank;  perform such other acts, and execute
and deliver to Bank such  additional  conveyances,  assignments,  agreements and
instruments,   as  Bank  may  at  any  time  request  in  connection   with  the
administration  and  enforcement of this Agreement or Bank's rights,  powers and
remedies hereunder.

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<PAGE>

                 4.9  Agreement  With Real Property  Owner/Landlord.  Obtain and
maintain such acknowledgments,  consents, waivers and agreements from the owner,
lienholder,  mortgagee  and landlord  with respect to any real property on which
Collateral  is  located  as  Bank  may  require,   all  in  form  and  substance
satisfactory to Bank.

                         ARTICLE 5 - NEGATIVE COVENANTS

         During  the  term  of  this  Agreement  and  until  payment  of all the
Indebtedness  and  performance  of all  obligations  to Bank,  Debtor  will not,
without the prior written consent of Bank:

                  5.1 Liens.  Create,  incur, assume or permit to exist any Lien
or grant any other  Person a negative  pledge on any  Collateral,  except  Liens
permitted under Section 6.2 of the Credit Agreement.

                 5.2  Documents of Title.  Sign or authorize  the signing of any
financing  statement or other  document  naming Debtor as debtor or obligor,  or
acquiesce or cooperate in the issuance of any bill of lading,  warehouse receipt
or other document or instrument of title with respect to any Collateral,  except
those negotiated to Bank or those naming Bank as secured party.

                 5.3  Disposition  of  Collateral.   Sell,  transfer,  lease  or
otherwise dispose of any Collateral except as permitted under Section 6.5 of the
Credit  Agreement.  Prior  to the  occurrence  of an Event  of  Default,  unless
otherwise agreed between Debtor and Bank, Debtor may use cash Proceeds collected
in the ordinary course of business.

                 5.4 Change in Location,  Name, Legal  Structure.  (a) Unless at
least 30 days' prior  notice  shall have been given to Bank,  change its name or
mailing address, or maintain Records,  its chief executive office, or a place of
business at a location  other than as  specified in Article 3; or (b) change the
nature of its business, or its legal structure.

                 5.5 Certain Agreements on Rights to Payment. Make or arrange to
make any material  discount,  credit,  rebate or other material reduction in the
original amount owing on a Right to Payment or accept in satisfaction of a Right
to Payment an amount materially less than the original amount thereof, except as
disclosed to Bank in writing from time to time.

                          ARTICLE 6 - EVENTS OF DEFAULT

                 6.1 Event of Default.  The  occurrence  of any Event of Default
under the Credit  Agreement  shall  constitute an "Event of Default"  under this
Agreement.

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<PAGE>

                 6.2 Acceleration and Remedies.  Upon the occurrence of an Event
of  Default,  Bank shall be entitled  to, at Bank's  option,  without  notice or
demand of any kind (a) declare all or any part of the  Indebtedness  immediately
due and payable; (b) exercise any or all of the rights and remedies available to
a secured party under the Uniform  Commercial Code or any other  applicable law;
and (c) exercise any or all of Bank's  rights and remedies  provided for in this
Agreement and in any other Loan Document.  The  obligations of Debtor under this
Agreement  shall continue to be effective or be reinstated,  as the case may be,
if at any time any payment of any Indebtedness is rescinded or must otherwise be
returned by Bank upon, on account of, or in  connection  with,  the  insolvency,
bankruptcy or reorganization of Debtor or otherwise,  all as though such payment
had not been made.

                 6.3  Sale of  Collateral.  Bank may sell all or any part of the
Collateral,  at public or private sales,  to itself,  a wholesaler,  retailer or
investor,  for cash,  upon credit or for future  delivery,  and at such price or
prices as Bank may deem commercially reasonable. To the extent permitted by law,
Debtor hereby  specifically  waives all rights of  redemption  and any rights of
stay or appraisal  which it has or may have under any  applicable  law in effect
from time to time.  Any such public or private sales shall be held at such times
and at such  place(s) as Bank may  determine.  In case of the sale of all or any
part of the Collateral on credit or for future delivery,  the Collateral so sold
may be retained by Bank until the selling  price is paid by the  purchaser,  but
Bank shall not incur any  liability in case of the failure of such  purchaser to
pay for the Collateral and, in case of any such failure,  such Collateral may be
resold.  Bank may,  instead of exercising its power of sale,  proceed to enforce
its  security  interest in the  Collateral  by seeking a judgment or decree of a
court of competent jurisdiction.

                 6.4 Debtor's Obligations Upon Default. Upon the request of Bank
after the occurrence of an Event of Default, Debtor will:

                 (a) Assemble and make  available to Bank the Collateral at such
     place(s) as Bank shall  designate,  segregating all Collateral so that each
     item is capable of identification; and

                 (b) Permit  Bank,  by Bank's  officers,  employees,  agents and
     representatives,  to enter any premises where any Collateral is located, to
     take  possession of the  Collateral,  and to remove the  Collateral,  or to
     conduct  any public or private  sale of the  Collateral,  all  without  any
     liability  of Bank for rent or other  compensation  for the use of Debtor's
     premises.

                    ARTICLE 7 - SPECIAL COLLATERAL PROVISIONS

                 7.1 Cash Collateral Account. All cash Proceeds received by Bank
pursuant to any  provisions  of this  Agreement  shall be deposited in a special
non-interest  bearing  collateral  account  established  with Bank,  and will be
applied in  accordance  with Section 7.7.  This account shall be held by Bank as
Collateral.

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                 7.2   Notification  to  Certain   Obligors  and  Possession  of
Proceeds. Bank may in its sole discretion at any time after the occurrence of an
Event of Default or an event  which with the giving of notice or the  passage of
time or both would  constitute an Event of Default (a) notify or cause Debtor to
notify the  obligors on the Rights to Payment to make  payment to Bank;  and (b)
take possession of any or all Proceeds, which Bank will apply in accordance with
Section 7.7.

                 7.3 Compromise and  Collection.  Debtor and Bank recognize that
setoffs,  counterclaims,  defenses  and other claims may be asserted by obligors
with respect to certain of the Rights to Payment;  that certain of the Rights to
Payment may be or become uncollectible in whole or in part; and that the expense
and  probability of success of litigating a disputed Right to Payment may exceed
the amount that  reasonably may be expected to be recovered with respect to such
Right to Payment.  Debtor hereby authorizes Bank,  effective upon the occurrence
of an Event of Default,  to compromise with the obligor,  accept in full payment
of any Right to Payment such amount as Bank shall negotiate with the obligor, or
abandon  any  Right to  Payment.  Any such  action by Bank  shall be  considered
commercially  reasonable so long as Bank acts in good faith based on information
known to it at the time it takes any such action.

                 7.4 Bank  Performance of Debtor's  Obligations.  Without having
any obligation to do so, Bank may perform or pay any obligation which Debtor has
agreed to perform or pay under this Agreement  including without  limitation the
payment or discharge of taxes or Liens levied or placed on or threatened against
the Collateral.  In so performing or paying,  Bank shall determine the action to
be taken and the amount  necessary to discharge such  obligations.  Debtor shall
reimburse  Bank on demand for any amounts paid by Bank pursuant to this Section,
which amounts shall constitute Indebtedness secured by the Collateral.

                 7.5  Power of  Attorney.  For the  purpose  of  protecting  and
preserving the Collateral and Bank's rights under this Agreement,  Debtor hereby
irrevocably   appoints   Bank,   with  full  power  of   substitution,   as  its
attorney-in-fact  with full power and  authority  to do any act which  Debtor is
obligated  to do  hereunder;  to  exercise  such  rights  with  respect  to  the
Collateral as Debtor might exercise; to use such Inventory,  Equipment, Fixtures
or other property as Debtor might use; to enter Debtor's premises; following the
occurrence of an Event of Default,  to give notice of Bank's  security  interest
in, and to collect the Collateral  and the Proceeds;  and to execute and file in
Debtor's name any financing statements,  amendments and continuation  statements
necessary or desirable to perfect or continue the perfection of Bank's  security
interests in the Collateral. Debtor hereby ratifies all that Bank shall lawfully
do or cause to be done by virtue of this appointment.

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                 7.6 Authorization for Bank to Take Certain Action. The power of
attorney created in Section 7.5 is a power coupled with an interest and shall be
irrevocable.  The powers  conferred on Bank  hereunder are solely to protect its
interests in the  Collateral and shall not impose any duty upon Bank to exercise
such  powers.  Bank  shall be  accountable  only for  amounts  that it  actually
receives  as a result of the  exercise of such powers and in no event shall Bank
or any of its  directors,  officers,  employees,  agents or  representatives  be
responsible to Debtor for any act or failure to act, except for gross negligence
or willful  misconduct.  Bank may exercise this power of attorney without notice
to or assent of Debtor,  in the name of Debtor, or in Bank's own name, from time
to time in Bank's sole discretion and at Debtor's expense.  To further carry out
the terms of this Agreement, Bank may:

                 (a) Execute any statements or documents or take  possession of,
     and endorse  and  collect  and receive  delivery or payment of, any checks,
     drafts, notes,  acceptances or other instruments and documents constituting
     Collateral, or constituting the payment of amounts due and to become due or
     any performance to be rendered with respect to the Collateral.

                 (b) Sign and endorse any  invoices,  freight or express  bills,
     bills of lading,  storage or warehouse receipts;  drafts,  certificates and
     statements  under any commercial or standby letter of credit;  assignments,
     verifications  and  notices  in  connection  with  Accounts;  or any  other
     documents  relating to the  Collateral,  including  without  limitation the
     Records.

                 (c) Use or operate  Collateral or any other  property of Debtor
     for the purpose of preserving or liquidating Collateral.

                 (d) File any claim or take any other  action or  proceeding  in
     any court of law or equity or as otherwise  deemed  appropriate by Bank for
     the  purpose  of  collecting  any  and  all  monies  due  or  securing  any
     performance to be rendered with respect to the Collateral.

                 (e)  Commence,  prosecute  or  defend  any  suits,  actions  or
     proceedings or as otherwise  deemed  appropriate by Bank for the purpose of
     protecting or collecting the Collateral. In furtherance of this right, upon
     the occurrence of an Event of Default,  Bank may apply for the  appointment
     of a receiver or similar official to operate Debtor's business, and, to the
     fullest extent  permitted by law,  Debtor hereby waives any right to oppose
     such appointment.

                 (f) Prepare, adjust, execute, deliver and receive payment under
     insurance  claims,  and  collect  and  receive  payment of and  endorse any
     instrument in payment of loss or returned  premiums or any other  insurance
     refund or return, and apply such amounts at Bank's sole discretion,  toward
     repayment of the Indebtedness or replacement of the Collateral.

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                 7.7  Application of Proceeds.  Any Proceeds and other monies or
property  received by Bank  pursuant to the terms of this  Agreement or any Loan
Document may be applied by Bank first to the payment of expenses of  collection,
including without limitation reasonable attorneys' fees, and then to the payment
of  the   Indebtedness   in  such  order  of  application  as  Bank  may  elect.
Notwithstanding  the rights given to Debtor  pursuant to  California  Civil Code
sections  1479  and  2822 or  equivalent  provisions  in the  laws of the  state
specified in the governing  law clause of this  document (and any  amendments or
successors  thereto),  to designate how payments will be applied,  Debtor hereby
waives  such  rights  and Bank shall  have the right in its sole  discretion  to
determine  the order and method of the  application  of payments  received  from
Debtor or from the sale or  disposition  of the  Collateral  and to revise  such
application prospectively or retroactively at its discretion.  The provisions of
this Section 7.7 are subject to the  provisions of Section  2.5(b) of the Credit
Agreement.

                 7.8  Deficiency.  If the  Proceeds  of any  disposition  of the
Collateral are insufficient to cover all costs and expenses of such sale and the
payment  in full of all the  Indebtedness,  plus all other sums  required  to be
expended  or  distributed  by Bank,  then  Debtor  shall be liable  for any such
deficiency.

                 7.9 Bank Transfer.  Upon the transfer of all or any part of the
Indebtedness,  Bank may transfer all or any part of the  Collateral and shall be
fully discharged  thereafter from all liability and responsibility  with respect
to such Collateral so transferred,  and the transferee  shall be vested with all
the rights and  powers of Bank  hereunder  with  respect to such  Collateral  so
transferred,  but with respect to any Collateral not so transferred,  Bank shall
retain all rights and powers hereby given.

                 7.10 Bank's Duties.

                     (a) Bank's sole duty with respect to the  Collateral in its
     possession  shall be to use reasonable care in the custody and preservation
     thereof.  Bank  shall be deemed to have  exercised  reasonable  care in the
     custody and  preservation of such Collateral if such Collateral is accorded
     treatment  substantially equal to that which Bank accords its own property,
     it being  understood  that  Bank  shall  not have  any  responsibility  for
     ascertaining   or  taking  action  with  respect  to  calls,   conversions,
     exchanges,  maturities,  declining value, tenders or other matters relative
     to any  Collateral,  regardless  of  whether  Bank has or is deemed to have
     knowledge of such matters;  or taking any  necessary  steps to preserve any
     rights  against  any  Person  with  respect  to any  Collateral.  Under  no
     circumstances  shall  Bank be  responsible  for any  injury  or loss to the
     Collateral,  or any  part  thereof,  arising  from  any  cause  beyond  the
     reasonable control of Bank.



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                     (b) Bank may at any time deliver the Collateral or any part
     thereof to Debtor and the  receipt of Debtor  shall be a complete  and full
     acquittance for the Collateral so delivered,  and Bank shall  thereafter be
     discharged from any liability or responsibility therefor.

                         ARTICLE 8 - GENERAL PROVISIONS

                 8.1 Notices.  Any notice given or required under this Agreement
shall be given in the manner specified in the Credit Agreement.

                 8.2  Binding  Effect.  This  Agreement  shall be  binding  upon
Debtor, its permitted  successors,  representatives and assigns, and shall inure
to the benefit of Bank and its successors,  and assigns;  provided  however that
Debtor may not assign or  transfer  Debtor's  obligations  under this  Agreement
without the prior  written  consent of Bank.  Bank  reserves  the right to sell,
assign,  or transfer its rights and powers  under this  Agreement in whole or in
part  without  notice to  Debtor.  In that  connection,  Bank may  disclose  all
documents and information  which Bank now or hereafter may have relating to this
Agreement,  Debtor or  Debtor's  business,  provided  that any such  assignee or
transferee  executed a  confidentiality  agreement  reasonably  satisfactory  to
Debtor.

                 8.3 No Waiver.  Any waiver,  consent or approval by Bank of any
Event of Default  or breach of any  provision,  condition  or  covenant  of this
Agreement or any Loan Document must be in writing and shall be effective only to
the extent  set forth in  writing.  No waiver of any breach or default  shall be
deemed a  waiver  of any  later  breach  or  default  of the  same or any  other
provision of this Agreement or any of the Loan  Documents.  Any failure or delay
on the part of Bank in  exercising  any  power,  right or  privilege  under this
Agreement or any Loan Document shall not operate as a waiver thereof,  nor shall
any single or partial  exercise of any such power,  right or privilege  preclude
any further exercise thereof.

                 8.4 Rights  Cumulative.  All rights and remedies existing under
this  Agreement  are  cumulative  to, and not  exclusive of, any other rights or
remedies available under contract or applicable law.

                 8.5 Unenforceable  Provisions.  Any provision of this Agreement
which is prohibited or unenforceable in any jurisdiction  shall be so only as to
such   jurisdiction   and   only  to  the   extent   of  such   prohibition   or
unenforceability,  but all the  remaining  provisions  of this  Agreement  shall
remain valid and enforceable.

                 8.6 Governing Law/Waiver or Notice.  Except as may be otherwise
provided  by the  Uniform  Commercial  Code  or in  any  addendum  hereto,  this
Agreement  shall be governed by and construed in accordance with the laws of the


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State of California.  Debtor hereby waives presentment,  demand, protest, notice
of dishonor and all other notices and demands, as well as any applicable statute
of limitations.

                 8.7 Indemnification.  Debtor shall pay and protect,  defend and
indemnify  Bank  and  Bank's  employees,   officers,  directors,   shareholders,
affiliates,   correspondents,  agents  and  representatives  (other  than  Bank,
collectively "Agents") against, and hold Bank and each such Agent harmless from,
all claims,  actions,  proceedings,  liabilities,  damages,  losses, and related
expenses  (including,  without limitation,  attorneys' fees and costs) and other
amounts  incurred  by Bank  and  each  such  Agent,  arising  from  the  matters
contemplated by this Agreement;  provided,  however,  that this  indemnification
shall not apply to any of the foregoing  incurred solely as the result of Bank's
or any Agent's gross  negligence  or willful  misconduct.  This  indemnification
shall survive the payment and  satisfaction  of all of Debtor's  obligations and
liabilities to Bank.

                 8.8  Reimbursement.  Debtor shall  reimburse Bank for all costs
and  expenses,  including  without  limitation  reasonable  attorneys'  fees and
disbursements  (and fees and  disbursements of Bank's in-house counsel) expended
or incurred by Bank in any arbitration,  mediation,  judicial  reference,  legal
action  or  otherwise  in  connection  with  (a) the  negotiation,  preparation,
amendment,  interpretation and enforcement of this Agreement,  including without
limitation during any workout,  attempted workout, and/or in connection with the
rendering of legal advice as to Bank's rights,  remedies and  obligations  under
this  Agreement,  (b)  collecting  any sum which  becomes  due Bank  under  this
Agreement,  (c) any proceeding for declaratory  relief,  any counterclaim to any
proceeding, or any appeal, or (d) the protection, preservation or enforcement of
any rights of Bank.  For the  purposes of this  section,  attorneys'  fees shall
include, without limitation, fees incurred in connection with the following: (1)
contempt  proceedings;  (2)  discovery;  (3) any  motion,  proceeding  or  other
activity of any kind in connection with a bankruptcy  proceeding or case arising
out of or relating to any petition  under Title 11 of the United States Code, as
the  same  shall be in  effect  from  time to  time,  or any  similar  law;  (4)
garnishment,   levy,   and  debtor  and  third  party   examinations;   and  (5)
post-judgment  motions and proceedings of any kind, including without limitation
any activity taken to collect or enforce any judgment.

                 8.9 Entire Agreement.  This Agreement is intended by Debtor and
Bank as the final expression of Debtor's  obligations to Bank in connection with
the Collateral and supersedes all prior understandings or agreements  concerning
the subject  matter  hereof.  This  Agreement  may be amended  only by a writing
signed by Debtor and accepted by Bank in writing.


<PAGE>



         IN WITNESS  WHEREOF,  Debtor has executed this Agreement as of the date
set forth in the preamble.

                               EMCON, a California corporation


                               By:      /s/
                                      ---------------------
                               Name:  R. Michael Momboisse

                               Title: CFO & V.P. - Legal

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<PAGE>


                                   EXHBIT 10.4

                                PLEDGE AGREEMENT


          This  Agreement is made as of February 29, 1996 by EMCON, a California
corporation ("Debtor"), in favor of THE BANK OF CALIFORNIA, N.A. ("Bank").

                                    Recitals

          Debtor  and Bank  have  executed  a  Credit  Agreement  of even  dated
herewith  (as the same may be amended  or  supplemented  from time to time,  the
"Credit Agreement"),  pursuant to which Bank has agreed to extend certain credit
facilities to Borrower on the condition,  among others,  that Borrower pledge to
Bank and grant to Bank a continuing security interest in certain shares of stock
and other  property  as security  for  Borrower's  obligations  under the Credit
Agreement.  All capitalized  terms used in this Agreement that are not otherwise
defined herein shall have the meanings ascribed thereto in the Credit Agreement.


          1.  Grant  of  Security  Interest.  Debtor  hereby  grants  to  Bank a
continuing  security  interest in all issued and  outstanding  shares of capital
stock of each of Debtor's Subsidiaries  identified on Schedule 1 annexed to this
Agreement (as such Schedule may be amended or  supplemented  from time to time),
now owned or  hereafter  acquired by Debtor (the  "Pledged  Shares"),  all stock
rights,  rights  to  subscribe,  liquidating  dividends,  stock  dividends,  new
securities  or other  property  to which  Debtor is or may  become  entitled  to
receive  on  account  of  such  Pledged   Shares,   and  all  proceeds   thereof
("Collateral").  Except as  provided  in Section  5(d)(i),  in the event  Debtor
receives any of the above forms of property,  Debtor will promptly deliver it to
Bank  to be  held  by  Bank  hereunder  in the  same  manner  as the  Collateral
originally delivered hereunder.

          2.  Indebtedness.  Debtor  agrees that the  Collateral is and shall be
security for the timely  payment and  performance of all  obligations  under all
Indebtedness  to  Bank.   "Indebtedness"   means  all  debts,   obligations  and
liabilities  of Debtor to Bank  currently  existing  or now or  hereafter  made,
incurred or created,  whether  voluntary or involuntary  and however  arising or
evidenced,  whether  direct or acquired  by Bank by  assignment  or  succession,
whether due or not due,  absolute or  contingent,  liquidated  or  unliquidated,
determined  or  undetermined,  whether  under this  Agreement or  otherwise  and
whether Debtor may be liable  individually or jointly,  or whether recovery upon
such debt may be or become  barred by any statute of  limitations  or  otherwise
unenforceable;  and all renewals,  extensions and modifications thereof; and all
attorneys' fees and costs incurred by Bank in connection with the collection and
enforcement  thereof.  Any writing which evidences or is an agreement in respect


                                      131
<PAGE>

to all or any portion of the  Indebtedness  is a "Loan  Document".  3.  Debtor's
Covenants. Debtor hereby represents, warrants and agrees that:

         (a) Debtor has acquired,  or forthwith  will acquire and maintain,  all
         portions of the marketable title to the Collateral described herein and
         will at all times keep the  Collateral  free of all Liens  except those
         permitted under Section 6.2 of the Credit Agreement;

         (b) Debtor will not sell,  transfer,  lease or otherwise dispose of any
         of the Collateral or any interest  therein to any individual or entity,
         including  without  limitation Bank where the context so permits and in
         Bank's sole discretion ("Person");

         (c) The Pledged  Shares have been duly and validly issued and are fully
         paid and  non-assessable.  Except as may be specifically stated to Bank
         in writing prior to the date hereof and as provided by law, the Pledged
         Shares are transferable without prior notice to, or approval or consent
         from, any Person or  governmental  or regulatory  authority,  and there
         exists no condition or  restriction to or affecting the transfer of the
         Pledged Shares;

          (d)  Debtor  will pay when due and  prior to  delinquency  all  taxes,
          levies,  assessments  or other  claims  which are or may become  liens
          against the Collateral;

          (e) Debtor will  neither  make nor permit any  material  change in the
          Collateral without the prior written consent of the Bank;

          (f) Except as otherwise  provided herein,  Debtor will deliver to Bank
          promptly  (i) all  Collateral,  (ii) all  proceeds of the  Collateral,
          (iii) such specific acknowledgments,  assignments, or other agreements
          or writings as Bank may request  relating to the Collateral,  and (iv)
          such  records  and other  reports  in such form and detail and at such
          times as Bank may require relating to the Collateral;  notwithstanding
          anything  to the  contrary  herein  contained,  Debtor may receive and
          retain  distributions  from a  Subsidiary  in  the  form  of  personal
          property  other than cash or securities in connection  with a business
          reorganization involving Borrower and such Subsidiary;

          (g)  Debtor  will  give  prompt  notice to Bank of any  threatened  or
          asserted dispute or claim with respect to the Collateral, any decrease
          in the value of any Collateral and the amount of such decrease  (other
          than  as  reflected  on  any  securities   exchange  or  other  market
          publication),   any   litigation  or   administrative   or  regulatory
          proceeding  which may have a material  adverse effect on Debtor or its


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<PAGE>

          business,  and the  occurrence of any Event of Default or of any other
          development,  financial or otherwise, which might materially adversely
          affect the Collateral or Debtor's  ability to perform its  obligations
          to Bank; and

          (h) Debtor will  execute  and  deliver to Bank,  and file or record at
          Debtor's  expense,  all notices and other  documents from time to time
          requested by Bank to maintain a first perfected  security  interest in
          the   Collateral  in  favor  of  Bank,   all  in  form  and  substance
          satisfactory  to Bank,  and perform  such other acts,  and execute and
          deliver  to  Bank  such   additional   assignments,   agreements   and
          instruments,  as Bank may at any time request in  connection  with the
          administration  and  enforcement  of this  Agreement or Bank's rights,
          powers and remedies hereunder.

          4. Events of Default. The occurrence of any Event of Default under the
          Credit  Agreement  shall  constitute an "Event of Default"  under this
          Agreement.

         5.       Rights on Default.

         (a) Upon the occurrence of an Event of Default, all Indebtedness shall,
         at the option of Bank, without demand or notice, become immediately due
         and payable.  Bank shall have all other  rights and remedies  available
         under  contract or  applicable  law,  which  include those of a secured
         party under the Uniform  Commercial Code, at law, or in equity, and the
         right to take  possession  of the  Collateral  (if not  then in  Bank's
         possession),  and sell and dispose of the same, or any part thereof, at
         public or private sale.

          (b) The proceeds of any sale or disposition  shall be applied first to
          the  reasonable  expenses of retaking,  holding,  preparing  for sale,
          discharging  all liens,  selling and the like,  then to the attorneys'
          fees and legal expenses incurred by Bank, and then to the Indebtedness
          in such order as Bank may determine.  Notwithstanding the rights given
          to Debtor pursuant to California  Civil Code sections 1479 and 2822 or
          equivalent  provisions  in the  laws  of the  state  specified  in the
          governing  law  clause  of  this  document  (and  any   amendments  or
          successors thereto), to designate how payments will be applied, Debtor
          hereby  waives  such  rights and Bank shall have the right in its sole
          discretion  to determine  the order and method of the  application  of
          payments  received from Debtor or from the sale or  disposition of the
          Collateral   and  to  revise   such   application   prospectively   or
          retroactively at its discretion.

          (c)  Person(s)  liable for all or any  portion of  Indebtedness  shall
          remain liable for the unsatisfied  portion of such  Indebtedness,  and
          shall promptly pay the same to Bank  immediately  and without  demand,
          with  interest  thereon  at the rate  provided  in the  Loan  Document
          applicable thereto, or, if no rate is otherwise provided,  at the rate
          of interest  applicable to the unsatisfied  amount of a money judgment
          of a court of the state whose laws govern this  Agreement.  Should the
          net proceeds  resulting from any such sale or  disposition  exceed the
          amount  owing to Bank,  Bank shall pay such  surplus to the  Person(s)
          legally entitled thereto.

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<PAGE>

          (d) So long as no Event of Default shall have occurred:

                           (i) Debtor  shall be  entitled  to receive and retain
                  all cash dividends  payable in connection with any the Pledged
                  Shares and to exercise any and all voting or consensual rights
                  and powers relating to or pertaining to any Pledged Shares for
                  any purpose not inconsistent with the terms of this Agreement.

                           (ii) Upon the occurrence  and during the  continuance
                  of an Event of  Default,  all  rights  of  Debtor  to  receive
                  payment  of  cash  dividends  or to  exercise  the  voting  or
                  consensual  rights and powers with respect to the  Collateral,
                  shall  cease,  and all such rights and  authority  to exercise
                  such voting or consensual  rights and powers or to receive and
                  retain such  dividends  shall inure to Bank. Any and all money
                  and other  property  paid over to or received by Bank pursuant
                  to the  provisions  of this Section may be retained by Bank as
                  additional  Collateral  or in Bank's  sole  discretion  may be
                  applied toward the satisfaction of the  Indebtedness.  In such
                  event, Bank shall have the right and power to receive, endorse
                  and  collect  all checks and other  orders for the  payment of
                  money made  payable to Debtor  representing  any  dividend  or
                  other distribution  payable or distributable in respect of any
                  Pledged Shares.

          (e) The  obligations of Debtor under this Agreement  shall continue to
          be effective or be reinstated,  as the case may be, if at any time any
          payment of any Indebtedness is rescinded or must otherwise be returned
          by Bank upon, on account of, or in connection  with,  the  insolvency,
          bankruptcy or  reorganization  of Debtor or  otherwise,  all as though
          such payment had not been made.

          6. Costs and Expenses.  Debtor  promises,  to the extent  permitted by
applicable  law, to reimburse Bank promptly for all costs and expenses  incurred
by Bank in  performing  any  agreement  of Debtor  which  Debtor  shall  fail to
perform,  or in taking  any other  action  which Bank  deems  necessary  for the
maintenance or  preservation  of any Collateral or its interest  therein,  which
costs and expenses shall constitute Indebtedness under this Agreement.

         7.       Power of Attorney.

         (a) Debtor hereby irrevocably appoints Bank, or any officer thereof, as
         Debtor's  true and lawful  attorney-in-fact  coupled  with an interest,
         with full power of  substitution,  to sign or endorse  any  instrument,
         document,  or other writing necessary or desirable to transfer title or
         other  rights  to or in  any  of the  Collateral;  and  to do all  acts
         necessary or incidental to assert, protect and enforce Bank's rights in
         the Collateral and under this Agreement. Debtor agrees that Debtor will
         reimburse  Bank  promptly  upon demand for any expenses  Bank may incur
         while  acting  as  Debtor's  attorney-in-fact,   which  expenses  shall
         constitute Indebtedness under this Agreement.

         (b)  Following  the  occurrence  of an  Event  of  Default  (except  as
         otherwise provided), without notice, and at the expense of Debtor, Bank
         in its name or in the name of Debtor may, but shall not be obligated to
         (i) collect by legal  proceedings  or otherwise,  endorse,  receive and
         receipt for all dividends,  interest, principal payments and other sums
         now or  hereafter  payable upon or on account of the  Collateral;  (ii)
         make any  compromise or  settlement  it deems  desirable or proper with
         reference to the  Collateral;  (iii) at any time,  insure,  process and
         preserve  the  Collateral;   (iv)  at  any  time,  participate  in  any
         recapitalization,   reclassification,   reorganization,  consolidation,
         redemption,  stock  split,  merger  or  liquidation  of any  issuer  of
         securities which constitute Collateral, and in connection therewith may
         deposit or surrender  control of the Collateral,  accept money or other
         property in  exchange  for the  Collateral,  and take such action as it
         deems proper in connection  therewith,  and any other money or property
         received  in  exchange  for the  Collateral  shall  be  applied  to the
         Indebtedness or held by Bank  thereafter as Collateral  pursuant to the


                                      134
<PAGE>

         provisions  hereof;  (v) cause Collateral to be transferred to its name
         or to the name of its  nominee;  (vi) at any time,  exercise  as to the
         Collateral all the rights, powers and remedies of an owner necessary to
         exercise its rights, subject to Section 5(d).

          8.  Waivers of  Debtor.  Debtor  waives  any right to require  Bank to
proceed against any Person, or to exhaust any Collateral or to pursue any remedy
in Bank's  power  whatsoever.  Bank shall not be required  to make  presentment,
demand or protest,  or give any notices thereof,  or take any action to preserve
rights  against  prior  parties  with respect to any of the  Collateral.  Debtor
waives  the right to plead any  statute  of  limitations  or any  defense to the
personal  liability  of Debtor as a defense to Bank's  exercise  of any right or
remedy hereunder.

          9. Non-Waiver. Bank may, in the exercise of its sole discretion, waive
an Event of Default,  or cure an Event of Default at Debtor's expense.  Any such
waiver shall be subject to Section 11(c) below.

         10.      Bank's Duties.

         (a) Bank's sole duty with respect to the  Collateral in its  possession
         shall  be to use  reasonable  care  in  the  custody  and  preservation
         thereof.  Bank shall be deemed to have exercised reasonable care in the
         custody and  preservation  of such  Collateral  if such  Collateral  is
         accorded treatment  substantially  equal to that which Bank accords its
         own  property,  it  being  understood  that  Bank  shall  not  have any
         responsibility for ascertaining or taking action with respect to calls,
         conversions,  exchanges,  maturities, declining value, tenders or other
         matters  relative to any Collateral,  regardless of whether Bank has or
         is deemed to have  knowledge of such  matters;  or taking any necessary


                                      135
<PAGE>

         steps to preserve  any rights  against  any Person with  respect to any
         Collateral.  Under no  circumstances  shall Bank be responsible for any
         injury or loss to the Collateral, or any part thereof, arising from any
         cause beyond the reasonable control of Bank.

          (b) Bank may at any time deliver the Collateral or any part thereof to
          Debtor  and the  receipt  of  Debtor  shall  be a  complete  and  full
          acquittance for the Collateral so delivered, and Bank shall thereafter
          be discharged from any liability or responsibility therefor.

          11. General Provisions.

          (a) Notices.  Any notices given or required under this Agreement shall
          be given in the manner specified in the Credit Agreement.

          (b) Binding  Effect.  This Agreement  shall be binding upon Debtor,its
          permitted successors,  representatives and assigns, and shall inure to
          the benefit of Bank and its successors,  representatives  and assigns;
          provided  however  that Debtor may not assign or  transfer's  Debtor's
          obligations under this Agreement without Bank's prior written consent.
          Bank  reserves the right to sell,  assign,  or transfer its rights and
          powers under this  Agreement,  in whole or in part  without  notice to
          Debtor.  In that  connection,  Bank may  disclose  all  documents  and
          information  which Bank now or  hereafter  may have  relating  to this
          Agreement,  Debtor  or  Debtor's  business,  provided  that  any  such
          assignee or transferee executes a confidentiality agreement reasonably
          satisfactory to Debtor.

          (c) No Waiver. Any waiver, consent or approval by Bank of any Event of
          Default or breach of any  provision,  condition  or  covenant  of this
          Agreement  or any  Loan  Document  must be in  writing  and  shall  be
          effective  only to the extent set forth in  writing.  No waiver of any
          breach or  default  shall be  deemed a waiver  of any later  breach or
          default of the same or any other provision of this Agreement or any of
          the  Loan  Documents.  No  failure  or  delay  on the  part of Bank in
          exercising any power,  right or privilege  under this Agreement or any
          Loan  Document  shall  operate as a waiver  thereof,  and no single or
          partial exercise of any such power,  right or privilege shall preclude
          any further  exercise  thereof,  or the exercise of any further power,
          right or privilege.

          (d) Rights  Cumulative.  All rights and remedies  existing  under this
          Agreement are cumulative to, and not exclusive of, any other rights or
          remedies available under contract or applicable law.

          (e) Unenforceable Provisions. Any provision of this Agreement which is
          prohibited or unenforceable in any jurisdiction shall be so only as to
          such  jurisdiction  and  only to the  extent  of such  prohibition  or
          unenforceability,  but all the remaining  provisions of this Agreement
          shall remain valid and enforceable.

                                      136
<PAGE>

          (f)  Governing  Law/Waiver  of  Notice.  Except  as may  be  otherwise
          provided by the Uniform  Commercial  Code or in any  addendum  hereto,
          this Agreement  shall be governed by and construed in accordance  with
          the laws of the State of California.  To the fullest extent  permitted
          by law, Debtor hereby waives presentment,  demand,  protest, notice of
          dishonor and all other notices and demands,  as well as any applicable
          statute of limitations.

          (g)  Indemnification.   Debtor  shall  pay  and  protect,  defend  and
          indemnify   Bank   and   Bank's   employees,    officers,   directors,
          shareholders,  affiliates,  correspondents, agents and representatives
          (other than Bank,  collectively  "Agents") against,  and hold Bank and
          each such Agent  harmless  from,  all  claims,  actions,  proceedings,
          liabilities, damages, losses, and related expenses (including, without
          limitation,  attorneys' fees and costs) and other amounts  incurred by
          Bank and each such Agent,  arising  from the matters  contemplated  by
          this Agreement; provided, however, that this indemnification shall not
          apply to any of the foregoing  incurred solely as the result of Bank's
          or  any  Agent's  gross   negligence  or  willful   misconduct.   This
          indemnification  shall survive the payment and  satisfaction of all of
          Debtor's obligations and liabilities to Bank.

          (h)  Reimbursement.  Debtor  shall  reimburse  Bank for all  costs and
          expenses,  including without limitation reasonable attorneys' fees and
          disbursements  (and fees and disbursements of Bank's in-house counsel)
          expended or incurred by Bank in any arbitration,  mediation,  judicial
          reference,  legal  action  or  otherwise  in  connection  with (a) the
          negotiation, preparation, amendment, interpretation and enforcement of
          this  Agreement,  including  without  limitation  during any  workout,
          attempted  workout,  and/or in connection  with the rendering of legal
          advice  as to Bank's  rights,  remedies  and  obligations  under  this
          Agreement,  (b)  collecting  any sum which becomes due Bank under this
          Agreement, (c) any proceeding for declaratory relief, any counterclaim
          to any proceeding, or any appeal, or (d) the protection,  preservation
          or  enforcement  of any  rights  of  Bank.  For the  purposes  of this
          section,  attorneys'  fees shall  include,  without  limitation,  fees
          incurred in connection with the following:  (1) contempt  proceedings;
          (2)  discovery;  (3) any motion,  proceeding or other  activity of any
          kind in connection with a bankruptcy proceeding or case arising out of
          or relating to any petition  under Title 11 of the United States Code,
          as the same shall be in effect from time to time,  or any similar law;
          (4) garnishment,  levy, and debtor and third party  examinations;  and
          (5)  postjudgment  motions  and  proceedings  of any  kind,  including
          without  limitation  any  activity  taken to collect  or  enforce  any
          judgment.

          (i) Entire Agreement. This Agreement is intended by Debtor and Bank as
          the final  expression  of Debtor's  obligations  to Bank in connection
          with  the  Collateral  and  supersedes  all  prior  understandings  or
          agreements concerning the subject matter hereof. This Agreement may be
          amended  only by a writing  signed by Debtor and  accepted  by Bank in
          writing.

                                      137
<PAGE>

          IN WITNESS WHEREOF,  Debtor has executed this Agreement as of the date
of the preamble.


                        EMCON

                        By:     /s/
                                ---------------------
                        Name:   R. Michael Momboisse

                        Title:   CFO & V.P. - Legal

                                       138
<PAGE>


                                  EXHIBIT 10.5




                                February 29, 1996

EMCON
400 South El Camino Real, Suite 1200
San Mateo, CA  94402
Attn:  R. Michael Momboisse, CFO

                  RE:      EURODOLLAR RATE OPTION AGREEMENT

Dear Mr. Momboisse:

          As of this date,  EMCON has entered into a Credit  Agreement  with The
Bank of  California,  N.A.  ("Bank")  pursuant  to which EMCON has (i) a line of
credit  facility  in the  maximum  principal  amount of  $10,000,000  and (ii) a
$10,000,000 term loan facility (collectively,  the "Credit Facility"), the terms
and conditions of which are governed by the Credit  Agreement,  a Line of Credit
Note,  a Term Loan Note,  and various  other  documents  ("Loan  Documents).  In
conjunction  with your current Credit  Facility,  Bank is pleased to offer you a
chance to participate in a special commercial pricing program.

                  1.       AVAILABILITY AND MATURITY

          Bank  usually  extends  financing  based on a  fluctuating  rate  that
changes  with the rate Bank  announces  to be in effect from time to time as its
prime rate ("Prime Rate"). The Prime Rate is a rate set by Bank based on various
factors,  including  general  economic and market  conditions,  and is used as a
reference point in pricing certain loans.  Bank may price its loans at, above or
below the Prime Rate.

          In  contrast,  Bank's  "Eurodollar  Rate" is a fixed rate (more  fully
defined below) Bank offers from time to time which, if you accept this proposal,
will apply to all or such portion of the principal amount  outstanding under the
Credit  Facility  ("Covered  Amount")  and for such time periods as you and Bank
shall  mutually  agree.  Pricing tied to the  Eurodollar  Rate is available  for
periods of 1, 2, 3, 6, 9 or 12 months (each a "Period"); provided, however, that
no Period shall have a maturity date  subsequent to the scheduled  maturity date
for the Credit Facility with respect to which the Covered Amount  relates.  This
pricing  may be  applied  to Covered  Amounts  in a minimum  of  $1,000,000  and
additional increments of $500,000 outstanding under the Credit Facility.

                                      139
<PAGE>

          Bank's  "Eurodollar Rate" is, for each Period, a rate comprised of (a)
the rate of interest at which Dollar deposits for such period and in such amount
would be offered to Bank in the Eurodollar Market at a time selected by Bank two
(2) Banking Days (as defined  below) prior to the  commencement  of the relevant
Period,  adjusted  for the  then  maximum  reserve,  capital  adequacy,  deposit
insurance,  and  similar  requirements  that  under  any  circumstance  could be
applicable to Bank pursuant to applicable law or  regulation,  and other amounts
associated with Bank's costs and desired return;  plus (b) a margin equal to one
and one-half percent (1.50%).  The Eurodollar  Market is the market in which the
buying and selling of United States Dollar  deposits  booked  outside the United
States of America occurs among the international banking community.

          Bank's  Eurodollar  Rate is available  and may be accepted only at the
time quoted by Bank for the  applicable  Period  beginning  two (2) Banking Days
hence. Due to changes in legal, regulatory,  economic or market conditions, Bank
may at any time  determine  that  pricing  based on the  Eurodollar  Rate is not
available, and thus, may be unable to offer such a rate.

          2. QUOTE, EURODOLLAR RATE, AND PAYMENTS

          For a quote  of  Bank's  Eurodollar  Rate  which  would  apply  to the
specified  Covered  Amount and Period,  you may call  Bank's San Mateo  Regional
Office  between 8:00 a.m.  and 11:00 a.m.  Pacific time on any day on which such
office and Bank's San Francisco  main office are open for business to the public
(each a "Banking  Day").  As the Eurodollar  Rate is established two (2) Banking
Days prior to the first day of the requested Period,  you must call at least two
(2)  Banking  Days prior to such date.  If you accept the  Eurodollar  Rate when
offered,  that rate will apply to such Covered Amount for the applicable Period.
Interest  shall be  calculated  for actual days  elapsed on the basis of a three
hundred and sixty (360) day year.

          During any Period,  you agree to pay interest on the Covered Amount at
the Eurodollar  Rate on the last day of each  consecutive  month,  beginning the
first such date after the commencement of the Period,  until the last day of the
Period,  whether scheduled or accelerated ("Maturity Date"). During each Period,
you must maintain under your Credit Facility a principal  balance which is not a
Covered Amount under any of your rate option  agreements with Bank sufficient to
cover each scheduled instalment of principal coming due during such Period under
the  Credit  Facility.  Should  you have any  obligation  under any  other  Loan
Document to repay any portion of the Credit Facility  ("Obligation")  that would
conflict  with  your  obligation  under  the  preceding  sentence  ("Maintenance
Obligation"), you shall nevertheless comply with the Obligation and not with the
Maintenance  Obligation,  and you  shall not be  deemed  in  default  hereunder.
Nonetheless,  payment of the Obligation shall be deemed to be a "Prepayment", as
defined below,  to the extent it repays a portion of a Covered Amount under this
or any of your other rate option agreements you may have with Bank.

          If,  prior to a Maturity  Date and while the Credit  Facility is still
available,  you and Bank have not agreed that a new rate tied to the  Eurodollar
Rate shall apply to a Covered Amount,  then, if the term of your Credit Facility
extends beyond such Maturity Date, Bank's Prime Rate plus the applicable margin,


                                      140
<PAGE>

if any,  under  the  terms  of  your  Credit  Facility  shall  be  automatically
applicable to such Covered Amount.

          Bank's records of the date, Covered Amount,  Period,  Eurodollar Rate,
Maturity Date, and all payments of principal and interest and all other payments
and amounts due under this letter  agreement  shall be conclusive and binding on
you, absent obvious error.

          3. PREPAYMENT LIMITATION

          Do not sign this  letter  agreement  before you read it.  This  letter
          agreement  provides for payment of  liquidated  damages if you wish to
          repay  the  loan  (Covered  Amount)  prior to the  date  provided  for
          repayment under the Credit Facility.

          Bank  establishes the Eurodollar Rate with the  understanding  it will
apply to the Covered Amount for the entire scheduled  Period. If for any reason,
including,  without limitation,  acceleration,  foreclosure or prepayment,  Bank
receives all or any portion of a Covered Amount (each a  "Prepayment")  prior to
the scheduled Maturity Date, then in consideration thereof you shall pay to Bank
on demand:

          a. The amount,  if any, by which the  additional  interest which would
          have been payable on the  Prepayment  exceeds the interest  which Bank
          would  receive  had it placed an amount  equal to the  Prepayment,  in
          United States  Dollars,  on deposit in the  Eurodollar  Market (or, at
          Bank's sole discretion, invested such amount in a domestic certificate
          of deposit issued by an institution rated at least "investment  grade"
          or "A" by Moody's or any successor  rating  agency) for a period equal
          to the period of time  remaining  until the maturity of the applicable
          Period.  Should the  scheduled  maturity  fall between two periods for
          which rates are quoted or  available to Bank,  then Bank,  in its sole
          discretion, shall interpolate this rate; and

          b. Any other out of pocket  costs to Bank  associated  with funding or
          maintaining the Covered Amount.

          Bank shall provide you a statement of the amount payable on account of
each Prepayment, which statement shall be a conclusive and binding determination
of the  amount  owed by you for  such  Prepayment,  absent  obvious  error.  All
Prepayments,  subject to this  Section  3,  shall be applied on the most  remote
instalment or instalments of principal then unpaid on the Credit  Facility being
prepaid.

          You  acknowledge  that any  Prepayment  may  result in Bank  incurring
additional  costs,  expenses  or  liabilities.  Therefore,  you agree to pay the
above-described  liquidated  damages and agree that said amount is a  reasonable
estimate of the costs,  expenses and  liabilities of Bank  associated  with each
Prepayment.

                                      141
<PAGE>

          4. SPECIAL FUNDING PROVISIONS

          If at any time Bank determines that:

          a. United States Dollar  deposits in principal  amounts similar to the
          Covered Amount bearing interest at the Eurodollar Rate and for periods
          equal to the  relevant  Period  are not  available  in the  Eurodollar
          Market;

          b. The  Eurodollar  Rate does not  cover  the cost to Bank of  making,
          funding or  maintaining  the  Covered  Amount at the  Eurodollar  Rate
          during any Period;

          c. Any  change in  financial,  political  or  economic  conditions  or
          currency exchange rates makes it impractical for Bank to make, fund or
          maintain the Covered Amount at the Eurodollar  Rate during any Period;
          or

          d. Any change in applicable law or regulation or in the interpretation
          thereof  (whether or not having the force of law) makes it unlawful or
          impractical  for Bank to make,  fund or maintain the Covered Amount at
          the Eurodollar  Rate,  then Bank shall promptly give notice thereof to
          you and as of the date  stated in such  notice,  the  Eurodollar  Rate
          option  shall  terminate,  and Bank's  Prime Rate plus the  applicable
          margin under the terms of your Credit Facility shall be  automatically
          applicable  to the  relevant  Covered  Amount  through  the end of the
          relevant Period.

          5. RESERVES, DEPOSIT INSURANCE, CAPITAL ADEQUACY

          You  shall  additionally  compensate  Bank upon  demand  for all costs
incurred,  or losses suffered,  including  without  limitation lost profits,  by
reason of:

          a.  any and all  increases  in  reserve,  deposit  insurance,  capital
          adequacy or similar  requirements  against (or against any class of or
          change in or in the  amount  of) the  assets or  liabilities  of Bank,
          deposits with or for the account of Bank, or loans by Bank, imposed by
          any  governmental or regulatory  authority  (whether or not having the
          force of law) in connection with a Covered Amount bearing  interest at
          the Eurodollar Rate; or

          b. compliance by Bank with any direction,  requirement or request from
          any  governmental or regulatory  authority  (whether or not having the
          force of law) in connection with a Covered Amount bearing  interest at
          the  Eurodollar  Rate to the  extent  any  such  costs  have  not been
          previously blended or adjusted into the Eurodollar Rate.



                                      142
<PAGE>

          Bank  shall  provide  you with a written  statement  of the amount and
basis of its request for compensation under this Section,  which statement shall
be a  conclusive  and binding  determination  of the amount owed by you,  absent
obvious error.

          6. TAXES

          a. If at any time any taxes,  fees or other  charges of any nature are
          imposed by any  governmental or regulatory  authority on any aspect of
          the  transactions  referred  to in  this  letter  agreement  including
          without  limitation all stamp or documentation  duties  (collectively,
          "Taxes"),  you shall pay such Taxes  directly,  or compensate Bank for
          such payment, as set forth below, except for such Taxes as are imposed
          on Bank's net income.

          b. In the event you are  prohibited  by  operation  of law from making
          payments or  reimbursements  to Bank without making such deductions or
          paying,  or  causing to be paid,  any and all Taxes,  you shall pay to
          Bank upon demand such additional  amounts as may be necessary in order
          to reimburse  Bank for Taxes paid by Bank on your behalf such that the
          aggregate  net amounts  received by Bank shall equal the amounts which
          would have been received if such deduction or withholding had not been
          required.

          c. You shall confirm that all applicable Taxes shall have been paid to
          appropriate  taxing  authorities  or agencies by sending  official tax
          receipts or notarized  copies of such  receipts to Bank within  thirty
          (30) days after  payment of any Taxes.  Should Bank receive  notice of
          any such liability for Taxes, Bank will promptly so inform you.

          7. GENERAL PROVISIONS

          a. To the extent interest rates,  prepayment  provisions and times for
          payment of  interest  established  under  this  letter  agreement  are
          different  than the terms of the note or notes  evidencing  the Credit
          Facility,  the terms of this letter agreement shall prevail. All other
          provisions of the Loan Documents remain in full force and effect.

          b. This letter agreement shall be governed by the laws of the State of
          California.

          c. This letter agreement,  and all confirmations  provided  hereunder,
          evidence the entire  agreement  of the parties on the matters  covered
          herein, and supersede all prior understandings and agreements.



                                      143
<PAGE>

          If you would like to  participate  in Bank's  Eurodollar  Rate  Option
program,  please  execute  the  enclosed  duplicate  original of this letter and
return it to Bank,  on or before  February  29,  1996,  at which time the option
granted in this letter will otherwise expire.

          The Bank is pleased to serve you.

                            Very truly yours,

                            THE BANK OF CALIFORNIA, N.A.


                            By:     /s/
                                   -------------------------
                                    Marie T. Wiseman, V.P.


ACCEPTED AND AGREED:

EMCON


By:     /s/
       ---------------------
Name:  R. Michael Momboisse
Title: CFO & V.P. - Legal

Dated:  February 29, 1996

                                       144
<PAGE>



                                  EXHIBIT 10.6




                                February 29, 1996

EMCON
400 South El Camino Real
Suite 1200
San Mateo, CA  94402
Attn:  R. Michael Momboisse, CFO

         RE:      FIXED RATE AMORTIZING OPTION AGREEMENT

Dear Mr. Momboisse:

          As of this date,  EMCON has entered into a Credit  Agreement  with The
Bank of  California,  N. A.  ("Bank")  pursuant to which EMCON has a $10,000,000
term loan facility ("Term Loan"), the terms and conditions of which are governed
by the Credit  Agreement,  a Term Loan Note, and various other documents  ("Loan
Documents").  In conjunction with your Term Loan, Bank is pleased to offer you a
chance to participate in a special commercial pricing program.

         1.       AVAILABILITY AND MATURITY

          Bank  usually  extends  financing  based on a  fluctuating  rate  that
changes  with the rate the Bank  announces  to be in effect from time to time as
its prime  rate  ("Prime  Rate").  The Prime Rate is a rate set by Bank based on
various factors,  including general economic and market conditions,  and is used
as a  reference  point in pricing  certain  loans.  Bank may price its loans at,
above or below the Prime Rate.

          In contrast, Bank's Amortizing Term Loan Fixed Rate ("ATLF Rate") is a
fixed rate (more fully  defined  below) the Bank offers from time to time which,
if you accept this  proposal  will apply to all or such portion of the principal
amount  outstanding  under the Term Loan  ("Covered  Amount")  and for such time
periods as you and Bank shall mutually  agree.  Pricing tied to the ATLF Rate is
available for one period of 12 to 84 months duration (the  "Period");  provided,
however,  that the last  day of the  Period  must  coincide  with the  scheduled
maturity date of the Term Loan.  This pricing may be applied to Covered  Amounts
in a minimum of $1,000,000  and  additional  increments of $500,000  outstanding
under the Term Loan.

                                      145
<PAGE>

          Bank's ATLF Rate is a rate comprised of (a) the blended rate per annum
which Bank calculates in good faith, at which funds in the amount of the Covered
Amount with an amortization schedule comparable to that required by the terms of
the Term  Loan  would be  available  to Bank in the  ordinary  course  of Bank's
business on the first day of the Period,  adjusted for the then maximum reserve,
capital adequacy,  deposit  insurance,  and similar  requirements that under any
circumstance  could  be  applicable  to  Bank  pursuant  to  applicable  law  or
regulation,  and other amounts  associated with Bank's costs and desired return;
plus (b) a margin equal to one and one-half percent (1.50%).

          The ATLF Rate is available and may be accepted only at the time quoted
by Bank.  Due to changes in legal,  regulatory,  economic or market  conditions,
Bank may at any time determine  that the ATLF Rate is not  available,  and thus,
may be unable to offer such a rate.

         2.       QUOTE, THE ATLF RATE, AND PAYMENTS

          For a quote of the  ATLF  Rate  which  would  apply  to the  specified
Covered Amount and Period, you may call Bank's San Mateo Regional Office between
8:00 a.m. and 11:00 a.m. Pacific time on any day on which such office and Bank's
San Francisco Main Office are open for business to the public. If you accept the
ATLF Rate when  offered,  that rate will  apply to such  Covered  Amount for the
entire Period.

          During the Period,  you agree to pay interest on the Covered Amount at
the ATLF Rate on the last day of each  consecutive  month,  beginning  the first
such date after the  commencement of the Period,  and continuing  through and on
the maturity date for the Term Loan, whether scheduled or accelerated ("Maturity
Date"). Each regularly scheduled principal payment date under the Term Loan is a
"Principal  Payment Date." During each Period, you must maintain under your Term
Loan a portion of the principal  balance which is not a Covered Amount under any
of your rate option  agreements  with Bank  sufficient  to cover each  scheduled
instalment  of  principal  coming due under the Term  Loan.  Should you have any
obligation  under any other Loan  Document to repay any portion of the Term Loan
("Obligation")  that would  conflict  with your  obligation  under the preceding
sentence  ("Maintenance  Obligation"),  you shall  nevertheless  comply with the
Obligation and not with the Maintenance Obligation,  and you shall not be deemed
in default hereunder.  Nonetheless, payment of the Obligation shall be deemed to
be a  "Prepayment",  as  defined  below,  to the extent it repays a portion of a
Covered  Amount under this or any of your other rate option  agreements  you may
have with Bank.

          Bank's records of the date, Covered Amount, ATLF Rate, Period, and all
payments of principal and interest, and all other payments and amounts due under
this letter  agreement  shall be conclusive  and binding on you,  absent obvious
error.


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<PAGE>

         3.       PREPAYMENT LIMITATION

          Do not sign this  letter  agreement  before you read it.  This  letter
          agreement  provides for payment of  liquidated  damages if you wish to
          repay  the  loan  (Covered  Amount)  prior to the  date  provided  for
          repayment under the Term Loan.

          Bank establishes the ATLF Rate with the understanding it will apply to
the Covered Amount for the entire Period. If, for any reason,  including without
limitation,  acceleration,  foreclosure or prepayment,  Bank receives all or any
portion of a Covered  Amount (each a  "Prepayment")  prior to the Maturity  Date
(but excluding  each payment of principal  required under the Term Loan which is
paid on its applicable  Principal Payment Date), then in consideration  thereof,
you shall pay to Bank on demand:

          a. The amount ("Prepayment  Liquidated Damages"), if any, by which the
          additional  interest  that would have been  payable on the  Prepayment
          exceeds the  interest  the Bank would  receive had it placed an amount
          equal  to the  Prepayment  in the  types  of  United  States  Treasury
          securities described in the calculation below. The date the Prepayment
          is received by Bank in immediately  available funds is the "Prepayment
          Effective Date". The amount of Prepayment  Liquidated  Damages will be
          calculated  in  accordance  with  the  following  formula,   with  all
          Prepayments  applied  first to the remote  instalment(s)  of principal
          then unpaid under the Term Loan:

                  Prepayment Liquidated Damages = P x (L-T) x N

                  Where

                           P =    the total dollar amount of the Prepayment;

                           N =    the  weighted  average  number  of  years
                                  remaining  to maturity  from the  Prepayment
                                  Effective Date for P, where each  successive
                                  year   ("Year")   used  to  calculate  N  is
                                  measured at its  midpoint  (i.e,  0.5 years,
                                  1.5 years, 2.5 years,  etc.) and is weighted
                                  by   the   cumulative   dollar   amount   of
                                  Prepayments   applied   during   that  Year,
                                  rounded to the next highest half-year;

                           L =    the ATLF Rate expressed in annualized decimal
                                  form ("annualized" means not modified for 
                                  number of days);

                           T =    the  "annualized"  fixed rate for a United
                                  States  Treasury  security  with a  maturity
                                  equal  to N where  the rate is  quoted  on a
                                  bond equivalent basis (that is, the security
                                  is deemed to  require  semi-annual  interest
                                  payments  with  interest  calculated  on  an
                                  actual 365/366-day basis) in decimal form. T
                                  will  be  calculated  by  interpolating  the


                                      147
<PAGE>

                                  rates  for  Treasury   constant   maturities
                                  included  in the  H.15  statistical  release
                                  published  by the  Federal  Reserve  for the
                                  latest weekly period prior to the Prepayment
                                  Effective Date.

 

          Bank may rely  upon  reports  transmitted  by the Dow  Jones  Telerate
          service,  the  Bloomberg  Financial  Markets,  Commodities,  and  News
          service, or any other news service it deems reputable to timely obtain
          values for rates on Treasury  constant  maturities.  If the prepayment
          calculation  requires the rate for a maturity that is not available in
          the  H.15  Treasury  constant  maturities  or if the H.15  release  is
          unavailable,  Bank at its discretion  may substitute  market yields on
          United States Treasury  securities that it deems to be a current issue
          with the appropriate maturity required to obtain the interpolated rate
          defined by T. In a case where market yields on current issue  Treasury
          securities  are utilized,  Bank will use yield values for the business
          day prior to the  Prepayment  Effective  Date and may depend upon such
          values reported by a financial news service Bank deems reputable.

          If T is  greater  than or equal to L at the  time of  calculation,  no
          payment of any kind is required.

               b. Any other out of pocket costs to Bank  associated with funding
               or maintaining the Covered Amount.

          Bank shall provide you a statement of the amount payable on account of
each Prepayment, which statement shall be a conclusive and binding determination
of the amount owed by you for such Prepayment, absent obvious error.

          You  acknowledge  that any  Prepayment  may  result in Bank  incurring
additional  costs,  expenses  or  liabilities.  Therefore,  you agree to pay the
above-described  liquidated  damages and agree that said amount is a  reasonable
estimate of the costs,  expenses and  liabilities of Bank  associated  with each
Prepayment.

         4.       RESERVES, DEPOSIT INSURANCE, CAPITAL ADEQUACY

          You  shall  additionally  compensate  Bank upon  demand  for all costs
incurred,  or losses suffered,  including  without  limitation lost profits,  by
reason of:

          a.  any and all  increases  in  reserve,  deposit  insurance,  capital
          adequacy or similar  requirements  against (or against any class of or
          change in or in the  amount  of) the  assets or  liabilities  of Bank,


                                      148
<PAGE>

          deposits with or for the account of Bank, or loans by Bank, imposed by
          any  governmental or regulatory  authority  (whether or not having the
          force of law) in connection with a Covered Amount bearing  interest at
          the ATLF Rate; or

          b. compliance by Bank with any direction,  requirement or request from
          any  governmental or regulatory  authority  (whether or not having the
          force of law) in connection with a Covered Amount bearing  interest at
          the ATLF Rate to the extent  any such  costs have not been  previously
          blended or adjusted into the ATLF Rate.

          Bank shall provide you a written  statement of the amount and basis of
its request for  compensation  under this Section,  which  statement  shall be a
conclusive and binding  determination  of the amount owed by you, absent obvious
error.

         5.       GENERAL PROVISIONS

          a. To the extent interest rates,  prepayment  provisions and times for
          payment of  interest  established  under  this  letter  agreement  are
          different  than the terms of the note  evidencing  the Term Loan,  the
          terms of this letter agreement shall prevail.  All other provisions of
          the Loan Documents remain in full force and effect.

          b. This letter agreement shall be governed by the laws of the State of
          California.

          c. This letter agreement,  and all confirmations  provided  hereunder,
          evidence the entire  agreement  of the parties on the matters  covered
          herein, and supersede all prior understandings and agreements.

          If you would  like to  participate  in the  Bank's  ATLF  Rate  Option
program,  please  execute  the  enclosed  duplicate  original of this letter and
return it to Bank,  on or before  February  29,  1996,  at which time the option
granted in this letter will otherwise expire.

          Bank is pleased to serve you.


                      Very truly yours,

                      THE BANK OF CALIFORNIA, N.A.

                      By:     /S/
                              ---------------------
                             Marie T. Wiseman, V.P.


                                      149
<PAGE>




                              ACCEPTED AND AGREED:

EMCON


By:        /s/
          ---------------------
Name:     R. Michael Momboisse
Title:    CFO & V.P. - Legal

Dated: February 29, l996


                                       150
<PAGE>


                                  EXHIBIT 99.1





                                                    Contact:  Kim Mortyn
                                                              (415) 375-1522


                         EMCON COMPLETES ACQUISITION OF
                        ORGANIC WASTE TECHNOLOGIES, INC.

          SAN MATEO, California,  March 1, 1996 -- EMCON (NASDAQ:MCON) announced
today it has  completed the  acquisition  of Organic  Waste  Technologies,  Inc.
(OWT),  a  privately   held  landfill  gas   technology  and  services   company
headquartered in Cleveland, Ohio.

          Principals of EMCON and OWT both commented they are extremely  pleased
to have completed this acquisition since the synergies between the two companies
significantly  strengthen each firm's service areas.  EMCON's engineering design
capabilities  and  OWT's  installation,   operations  and  maintenance  services
complement each other, and both companies' customers should benefit as a result.
Gene  Herson  (EMCON's  President  and CEO)  emphasized  this is the first  step
towards  the goal of  creating  the  "best in  class"  integrated  environmental
management services company.

          EMCON's acquisition is non-dilutive to existing  shareholders and will
be accounted for as a purchase. Under the terms of the agreement, EMCON acquires
all of the capital stock of OWT in exchange for $14 million in cash.

          EMCON is a nationally recognized consulting firm providing services in
environmental  engineering,  waste management, air and water quality management,
occupational  health and safety,  and  construction.  Established in 197l, EMCON
offers its environmental services from over 40 offices nationwide to private and
public sector clients in the United States and abroad.

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