EXHIBIT 10.18

                      RESCISSION AND REFORMATION AGREEMENT


         This  Rescission  and  Reformation  Agreement is entered into
effective as of November 1, 1996 (the  "Effective  Date") by and among
EMCON, a California corporation ("EMCON"); Organic Waste Technologies,
Inc., a Delaware  corporation  (the  "Company");  and the  undersigned
former  holders of the  Company's  common stock and options to acquire
the Company's common stock  (individually a "Management  Stakeholder,"
and collectively the "Management Stakeholders").

                                    RECITALS

         A. Pursuant to a Stock Purchase  Agreement entered into as of
January  30,  1996  (the  "Stock  Purchase  Agreement"),  the  Company
purchased (the  "Purchase") from the Management  Stakeholders  some or
all of the  shares of the  Company's  common  stock  (the  "Shares  at
Issue") and options to purchase  shares of the Company's  common stock
(the "Options at Issue") held by each such  Management  Stakeholder as
set forth opposite such Management  Stakeholder's name on Exhibit A in
exchange for a convertible  promissory note executed by the Company, a
copy of which is set forth on  Exhibit B  (individually  a "Note"  and
collectively the "Notes").

         B. EMCON  guaranteed  payment of the Notes and entered into a
note  agreement  in the  form  set  forth  as  Exhibit  C  (the  "Note
Agreement"),  pursuant to which, among other obligations, EMCON agreed
to (i) exchange each Note for shares of EMCON common stock if the Note
had not been converted  into the Company's  common stock in accordance
with the terms of the Note prior to the fifth  anniversary of the date
of the Note  Agreement  and (ii)  loan  each  Management  Stakeholder,
pursuant  to the terms of a loan  agreement  set forth as Exhibit A to
the Note  Agreement  (the "Loan  Agreement"),  an amount  equal to any
federal,  state and local  income  taxes  required  to be paid by each
Management  Stakeholder  as a  result  of the  Purchase.  None  of the
obligations  set forth in the Note  Agreement has arisen and EMCON has
not executed any Loan Agreement.

         C. The  purchase  of the  Options  at  Issue  by the  Company
resulted in cancellation of the Options at Issue. The parties intended
that the  portion of the  principal  amount of the Notes  representing
payment  for the  Options  at Issue,  plus  interest  related  thereto
(collectively  the  "Option  Payment  Amounts"),  be a mere  unfunded,
unsecured  promise of the  Company,  guaranteed  by EMCON,  to pay the
Option Payment Amounts in the future, when due.

         D. The parties  desire to rescind  the  Purchase ab initio so
that the  Management  Stakeholders  shall own the  Shares at Issue and
Options  at  Issue  held  by  each  of  them   immediately   prior  to
consummation of the Purchase.

         E. The Management Stakeholders desire to sell their Shares at
Issue  and the  Company  desires  to  acquire  the  Shares at Issue in
exchange for new  promissory  notes (the "New Notes") in the same form
set forth in the Notes, but in the amounts set forth in Exhibit D. The
Management   Stakeholders  desire  to  have  their  Options  at  Issue
canceled,  and the Company  desires to cancel  such  Options at Issue,
pursuant to the terms of this Agreement.

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         F.  Capitalized  terms not defined  herein have the same meaning as set
forth in the Stock Purchase Agreement.

                                    AGREEMENT

         1. RESCISSION.  EMCON, the Company and Management  Stakeholders  hereby
rescind the Purchase ab initio,  and thereby  undo such  Purchase so as to place
the parties for all purposes with respect to the Shares at Issue and the Options
at Issue in the same position as of the Effective  Date in which they would have
been had such Purchase never occurred.  To effect such  rescission,  the parties
agree that:

             (a) STOCK  PURCHASE  AGREEMENT.  With respect to the Purchase,  the
Stock  Purchase  Agreement is of no force and effect,  except as  otherwise  set
forth herein. All of the parties to the Stock Purchase Agreement remain bound by
the Stock  Purchase  Agreement  for all  other  purposes,  including,  by way of
example  but  not by way of  limitation,  (i) all  representations,  warranties,
covenants,  agreements,  objections  and rights  other than with  respect to the
Purchase,  and  (ii) all  representations,  warranties,  covenants,  agreements,
obligations, rights and actions of any person who is a Management Stakeholder in
any capacity other than as a Management Stakeholder.  In addition, Sections 12.1
to 12.8 of the Stock Purchase  Agreement apply with full force and effect to the
transactions contemplated by this Agreement.

             (b) OPTIONS AT ISSUE AND SHARES AT ISSUe.  Pursuant to this Section
1, the Management  Stakeholders  own the Shares at Issue and Options at Issue as
of the Effective  Date,  and the  assignment of the Options at Issue executed by
each of the Management Stakeholders pursuant to the Stock Purchase Agreement and
the cancellation thereof is null and void.

             (c)  NOTES.  The  Management  Stakeholders  have  marked  the Notes
canceled and have returned the original, executed Notes to the Company.

             (d) NOTE AGREEMENT. The Note Agreement is null and void.

         2. SALE OF SHARES AT ISSUE.  The  Management  Stakeholders  hereby sell
their  Shares at Issue to the Company and the Company  hereby buys the Shares at
Issue of each of the Management  Stakeholders  in exchange for a New Note in the
amount  and form set forth as  Exhibit  D. The  parties  hereto  agree that as a
result of the sale pursuant to this Agreement, it shall not be necessary for the
Company to reissue certificates for the Shares at Issue to effect the rescission
set forth in Section 1.

         3.  CANCELLATION  OF OPTIONS AT ISSUE.  The Options at Issue are hereby
canceled in exchange for the  Company's  unfunded,  unsecured  promise to pay to
Management  Stakeholders  the  amounts  set  forth  on  Exhibit  D (the  "Option
Cancellation  Amounts"),  on the dates set forth on Exhibit D. The Company shall
have no right to prepay the Option Cancellation Amounts.

             (a) ISSUANCE OF COMPANY STOCK. If the Company consummates a sale of
the Company'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


                                       46


Offering,   the  Option  Base  Amount  as  set  forth  on  Exhibit  D  shall  be
automatically  converted  (the  "Conversion")  into shares of OWT Common  Stock,
pursuant to the terms of this  Section 3. In such event,  a pro-rata  portion of
the unpaid  Option  Cancellation  Amounts  for each of the first  through  fifth
periods  set forth on  Exhibit D shall be  immediately  due and  payable  by the
Company to the Management Stakeholders,  based on the Option Cancellation Amount
for each such  period  multiplied  by the ratio of (i) the number of days within
such period which have elapsed prior to the Conversion divided by (ii) the total
number of days in such period (the "Period Ratio");  provided,  however, that if
the Option  Cancellation  Amount for the first period has not been paid in full,
the amount paid shall  include the First  Period  Acceleration  Penalty plus the
product  of (x) the  Remainder  set forth on Exhibit  D,  multiplied  by (y) the
Period Ratio for the first period.

                 (1) CONVERSION  PRICE. The number of shares of OWT Common Stock
into which the Option Base Amount shall be converted  shall be the amount of the
Option Base Amount,  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 3(a)(2) hereof.

                 (2)  ADJUSTMENTS  TO OWT CONVERSION  PRICE.  The OWT Conversion
Price shall be adjusted as set forth in this section 3(a)(2):

                      (i)  SUBDIVISIONS.  If  the  Company  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.

                      (ii) STOCK DIVIDENDS. If the Company 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.

                      (iii) RECLASSIFICATION OR MERGER. If any reclassification,
change or conversion of the OWT Common Stock occurs (other than as a result of a
subdivision or combination  described above and other than upon any Acceleration
Event, as defined below),  the Management  Stakeholders  shall have the right to
receive,  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 the Option  Base  Amount
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.

                      (iv) ANTI-DILUTION  PROTECTion.  If the Company 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.

                                       47


                 (3)  Participation in Initial Public  Offering.  If the Company
undertakes  an  Initial   Public   Offering  or  any  other  public   registered
underwritten  offering  pursuant to the  Securities Act of 1933, as amended (the
"Act"),  each Management  Stakeholder may, at his option, sell the shares of OWT
Common  Stock into which the Option  Base  Amount may be  converted  pursuant to
Section 3 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 offering. This right shall expire at such time as
Management  Stakeholder  may sell all shares of OWT Common  Stock into which the
Option Base Amount 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 Agreement Note (as defined below).

             (b) OFFSET.

                 (1)  The  Option  Cancellation  Amounts  due  hereunder  may be
reduced by any amounts due from the Management  Stakeholder to EMCON pursuant to
Section 12.2 of the Stock  Purchase  Agreement,  which  section  remains in full
force and effect.

                 (2) In addition, the Option Cancellation Amounts may be reduced
by any amount  outstanding from the Management  Stakeholders under the Loan Note
(as defined in the Note Agreement) which the Management  Stakeholders  then owes
to OWT or EMCON.

             (c) ACCELERATION.

                 (1) Notwithstanding  anything to the contrary herein, if any of
the events set forth in  paragraphs  (a) through (h) of this Section 3(c) (each,
an "Acceleration Event") shall occur at any time after the date hereof, then, at
the option of the  Management  Stakeholders,  the  Option  Base  Amount,  plus a
pro-rata portion of the unpaid Option Cancellation Amounts for each of the first
through  fifth  periods  set  forth on  Exhibit D shall be  immediately  due and
payable by the Company to the Management  Stakeholders.  The pro-rata portion of
the unpaid  Option  Cancellation  Amounts for each period  shall be based on the
Option  Cancellation Amount for each such period multiplied by the Period Ratio;
provided,  however,  that if the Option Cancellation Amount for the first period
has not been paid in full,  the  amount  paid  shall  include  the First  Period
Acceleration  Penalty plus the product of (x) the Remainder set forth on Exhibit
D,  multiplied  by (y) the Period Ratio for the first  period.  An  Acceleration
Event includes the following:

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

                      (iii) 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  Company,  other than to an  affiliate  or  affiliates  of the Company and a
substantial diminution in the responsibilities of Mark H. Shipps with respect to
the Company in his capacity as an employee of EMCON;

                                       48


                      (iv) 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 upon a change in ownership of Fifty  Percent  (50%) or more, in a
single transaction, of the stock of EMCON;

                      (v) upon the liquidation, dissolution or winding up of the
Company or the  consolidation  or merger of the  Company  with and into  another
corporation  (other  than a  merger  in  which  the  Company  is  the  surviving
corporation);Error! Bookmark not defined.

                      (vi) 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 Company becomes owned by persons other than EMCON or an
affiliate or affiliates of EMCON;

                      (vii)  upon the death of the  Management  Stakeholders  or
termination of the  Management  Stakeholders'  employment by the Company,  other
than a  Termination  for Cause.  "Termination  for Cause" is intended to embrace
intentionally  or  grossly  negligent  conduct  on the  part  of the  Management
Stakeholders which is materially detrimental to the operations and/or reputation
of the Company or EMCON. By way of illustration such actions would include (but
would not be  limited  to) a  material  breach of the  Management  Stakeholders'
obligations under any employment  agreement between the Management  Stakeholders
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
Management   Stakeholders'  ability  to  perform  the  Management  Stakeholders'
employment obligations;

                      (viii)  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 Management  Stakeholder
has  exchanged  this  Note for  common  stock  of  EMCON,  pursuant  to the Note
Agreement.

         4. NOTE AGREEMENT. The parties hereto shall enter into a note agreement
substantially in the form attached hereto as Exhibit E.

         5.  CONSISTENT  TREATMENT.  Each  party  shall  treat the  Purchase  as
rescinded  for all  purposes  and shall  take no action  inconsistent  with such
treatment.

         6.   REPRESENTATIONS  AND  WARRANTIES  OF  THE  COMPANY.   The  Company
represents and warrants, as of the Date of the Deposit, to EMCON that, except as
set forth on the Company  Disclosure  Schedule and without  giving effect to the
Contemplated Transactions:

             (a) CORPORATION ORGANIZATION.

                 (1) 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


                                       49


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.

                 (2)  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.

             (b) CAPITALIZATION.

                 (1) 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.

                                       50


                 (2) 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 Management  Stakeholder are currently  outstanding to purchase or
otherwise  receive  any of the  capital  stock  of the  Company  or the  Company
Subsidiaries.

                 (3)  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.

             (c) 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.

             (d) 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.

             (e) 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.

             (f) Absence of Unaccrued  or  Undisclosed  Liabilities.  Except for
claims, liabilities or obligations:

                                       51


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

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

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

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

                 (5) 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  (1)  through  (5) of this
Section  6(f),  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  6(f)  shall in any way  affect  any  other  representation  or
warranty contained in this Agreement.

                 (g) ABSENCE OF CERTAIN  CHANGES.  Since December 31, 1995 there
has not been  any:  (1)  material  adverse  change  in the  business,  financial
condition or operations of the Company and the Company  Subsidiaries  taken as a
whole,  (2)  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,   (3)  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 contemplated hereby, (4) unwaived default in respect
of any Material Contracts (as defined in Section 6(n), 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, (5) material change in the methods
and  procedures  employed in keeping the books and records of the Company or the
Company Subsidiaries or (6) strike or material labor dispute.

                 (h) 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


                                       52

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.

                 (i) TITLE TO PROPERTIES; ACCOUNTS RECEIVABLE

                      (1) 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.

                      (2) 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


                                       53


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.

                      (3) 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 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.

                  (j) Proprietary Rights.

                      (1) 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.

                      (2) 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.

                      (3) 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.

                 (k) CUSTOMER  LISTS.  The Company has provided the Buyer access
to a  complete  and  accurate  list  of each of the  material  customers  of the


                                       54


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

                  (l) BENEFIT PLANS AND ARRANGEMENTS.

                      (1)  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.

                      (2) 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").

                      (3) 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.

                      (4) 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.

                      (5) 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


                                       55


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.

                  (m) Compliance with Laws; Legal Proceedings.

                      (1) 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.

                      (2) 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.

                      (3) 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.

                 (n) 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
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


                                       56


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.

                 (o) EMPLOYEE RELATIONS.

                      (1) 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.

                      (2) 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.

                 (p)  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.

                 (q) ENVIRONMENTAL COMPLIANCE.

                      (1) 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.

                                       57


                      (2) 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.

                                       15


                 (r) ADVANCES; RELATED PARTY TRANSACTIONS

                      (1) 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.

                      (2) 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.

                 (s)  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.

                 (t) 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.

                 (u) 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,


                                       58


consolidation  or other  reorganization,  or disposition of all or substantially
all the assets, of the Company.

                 (v)  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.

                 (w) 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.

         7.  REPRESENTATIONS  AND  WARRANTIES OF MANAGEMENT  STAKEHOLDERS.  Each
Management  Stakeholder,  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 EMCON as follows:

             (a)  OWNERSHIP  OF SHARES AT ISSUE AND OPTIONS AT ISSUE.  Except as
set  forth in the  Company  Disclosure  Schedule,  after  giving  effect  to the
rescission provided for in Section 1 hereof, the Management  Stakeholder owns of
record  and  beneficially  the  number of Shares at Issue and  Options at Issue,
indicated opposite such Management  Stakeholder's name in Exhibit B to the Stock
Purchase  Agreement,  with full right and  authority to exchange  such Shares at
Issue hereunder and to assign such Options at Issue hereunder, and upon delivery
of such Shares at Issue  and/or  Options at Issue  hereunder,  the Company  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.

             (b)  EXECUTION,   DELIVERY  AND  ENFORCEABILITY  OF  AGREEMENT;  NO
VIOLATION.  This  Agreement has been duly executed and delivered by or on behalf
of the Management  Stakeholder and any other documents  required hereunder to be
executed and delivered by or on behalf of the Management  Stakeholders will have
been duly executed and delivered.  This Agreement  constitutes the legal,  valid
and binding obligation of the Management  Stakeholder,  enforceable against such
Management  Stakeholder 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 Management  Stakeholder  hereunder  constitute the legal,  valid and binding
agreements of the Management Stakeholder executing the same, enforceable against
such Management Stakeholder 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
transactions  contemplated hereby by the Management Stakeholder will violate, or


                                       59


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  such  Management  Stakeholder  is a party or by which such
Management Stakeholder or such Management Stakeholder's properties are bound.

             (c)  INFORMATION  SUPPLIED.  To the  Knowledge  of such  Management
Stakeholder,  neither this Agreement,  the Stock Purchase Agreement, the Company
Financial Statements,  the Company Disclosure Schedule, the Exhibits attached to
this Agreement,  or the Stock Purchase  Agreement,  nor any other certificate or
document  furnished  or to  be  furnished  by  the  Company  or  the  Management
Stakeholders  pursuant  to the terms of this  Agreement  or the  Stock  Purchase
Agreement contains or will contain any untrue statement of a material fact known
to the  Management  Stakeholder 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.

             (d)  RESIDENCE  AND  DOMICILE.  The  Management  Stakeholder  is  a
resident  of, and  domiciled  in, the State  indicated on Exhibit B to the Stock
Purchase Agreement as being the residence of such Management Stakeholder.

             (e) BROKERS OR FINDERS.  Except as set forth in Section 3.20 of the
Stock  Purchase  Agreement,  neither the  Management  Stakeholder or any of such
Management  Stakeholder'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  transactions
contemplated hereby.

         8.  REPRESENTATIONS  AND  WARRANTIES  OF EMCON.  EMCON  represents  and
warrants to Management  Stakeholders and the Company,  as of the date hereof and
except as set forth in the Buyer Disclosure Schedule, as follows:

             (a)  ORGANIZATION  AND GOOD STANDING.  EMCON is a corporation  duly
organized, validly existing, and in good standing under the laws of the State of
California.

             (b)  EXECUTION,   DELIVERY  AND  ENFORCEABILITY  OF  AGREEMENT;  NO
VIOLATION.  This  Agreement has been duly executed and delivered by or on behalf
of  EMCON,  and any  other  documents  required  hereunder  to be  executed  and
delivered by or on behalf of EMCON will have been duly  executed and  delivered.
This Agreement  constitutes  the legal,  valid and binding  obligation of EMCON,
enforceable  against EMCON 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 EMCON
constitute the legal, valid and binding agreements of EMCON, enforceable against
EMCON 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 EMCON 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 EMCON
is a party or by which EMCON or its properties are bound. Except as set forth in
the Buyer Disclosure  Schedule,  EMCON is not and will not be required to obtain
any Consent from any Person in  connection  with the  execution  and delivery of
this Agreement or the  consummation  or  performance of any of the  transactions
contemplated hereby.

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             (c) CERTAIN  PROCEEDINGS.  There is no pending  Proceeding that has
been  commenced  against  EMCON  that  challenges,  or may  have the  effect  of
preventing,  delaying, making illegal, or otherwise interfering with, any of the
transactions  contemplated hereby. To EMCON's Knowledge,  no such Proceeding has
been threatened.

             (d)  BROKERS OR  FINDERS.  EMCON 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.

             (e)  INFORMATION  SUPPLIED.  Neither  EMCON'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.

             (f) NO MATERIAL CHANGE. Since September 30, 1995, there has been no
material adverse change in EMCON's business, financial position or operations.

         9. GENERAL PROVISIONS.

             (a)  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,  the  transactions  contemplated  hereby and the Contemplated
Transactions,  including  all  fees and  expenses  of  agents,  representatives,
counsel, and accountants.

             (b) CONFIDENTIALITY. Between the date of this Agreement and January
30, 2001,  EMCON and Management  Stakeholders  will maintain in confidence,  and
will cause the directors, officers, employees, agents, and advisors of EMCON 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,
the  transactions   contemplated  hereby,  or  the  Contemplated   Transactions,
expressly  including  the reports of all  consultants  retained  pursuant to the
terms of this  Agreement  and the  Stock  Purchase  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
transactions  contemplated hereby or the Contemplated  Transactions,  or (c) the
furnishing or use of such information is required by legal proceedings.

             (c)   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):

                                       61


      Management Stakeholders:         To each  Management  Stakeholder  at the
                                       address set forth on Exhibit B to the
                                       Stock Purchase Agreement.

      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

      EMCON:                           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

             (d)  BINDING  ARBITRATION;  SERVICE OF  PROCESS.  In the event of a
dispute  between the parties  related to or arising out of this  Agreement,  the
Agent and  representatives  of EMCON 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.

                 (i) 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
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.

                 (ii) 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


                                       62


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.

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

             (e)  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.

             (f)  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 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.

             (g)  ENTIRE  AGREEMENT  AND  MODIFICATION.  Except  as set forth in
Section 1 hereof,  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.

             (h)  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 EMCON may assign any of its rights under this  Agreement to any  Subsidiary


                                       63


of EMCON but EMCON 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.

             (i)  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.

             (j) SECTION  HEADINGS,  CONSTRUCTION.  The  headings of Sections in
this  Agreement  are  provided  for  convenience  only and will not  affect  its
construction or interpretation.  Unless otherwise  indicated,  all references to
"Sections" refer to the corresponding 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.

             (k) 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.

             (l) TIME OF ESSENCE.  With regard to all dates and time periods set
forth or referred to in this Agreement, time is of the essence.

             (m) 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.

             (n)  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.

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

EMCON                                      THE COMPANY

EMCON, a California corporation            ORGANIC WASTE TECHNOLOGIES,INC.,
                                           a Delaware corporation

By:      /s/R. Michael Momboisse             By:     /s/Mark H. Shipps
         ---------------------------                 -----------------------
         R. Michael Momboisse                        Mark H. Shipps

Its:     CFO & Vice President Legal          Its:    President
         ---------------------------                 -----------------------

                                       64



                                               THE MANAGEMENT STAKEHOLDERS

                                             /s/Mark H. Shipps
                                             -------------------------------
                                             MARK H. SHIPPS

                                             /s/Anthony A. Alexander
                                             -------------------------------
                                             ANTHONY A. ALEXANDER

                                             /s/James Helmick
                                             -------------------------------
                                             JAMES HELMICK

                                             /s/Raymond J. Nardelli
                                             -------------------------------
                                             RAYMOND J. NARDELLI

                                             /s/Stephen Lingafelter
                                             -------------------------------
                                             STEPHEN LINGAFELTER

                                             /s/Randall W. Chapman
                                             -------------------------------
                                             RANDALL W. CHAPMAN



                                       65