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


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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.

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                  (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


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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

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                           (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;

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                           (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


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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.

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         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


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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


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

                                       86


         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





         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