EXHIBIT 10.3

                               SECURITY AGREEMENT


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

                                    Recitals

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


                             ARTICLE 1 - DEFINITIONS

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

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

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

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

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

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


                                      116


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

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

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

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

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

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

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

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

                                      117


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

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

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

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

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

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

                     ARTICLE 2 - GRANT OF SECURITY INTEREST

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

                   ARTICLE 3 - REPRESENTATIONS AND WARRANTIES

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

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

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


                                      118


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

                 3.3 Governmental Actions.  Debtor has obtained all consents and
actions of, and has performed all filings with, any  governmental  or regulatory
authority that are required to authorize the execution,  delivery or performance
of this Agreement or the granting or perfecting of Bank's  security  interest in
the Collateral.

                 3.4 Title.  Except as permitted under Section 6.2 of the Credit
Agreement, Debtor is and will be the unconditional legal and beneficial owner of
the Collateral, and the Collateral is genuine and subject to no Liens, rights or
defenses of others. Except for Inventory under documents duly negotiated to Bank
or showing Bank as secured party, no bill of lading,  warehouse receipt or other
document of title is outstanding with respect to any of the Collateral.

                 3.5 Rights to Payment. The names of the obligors,  amount owing
to Debtor,  due dates and all other  information  with  respect to the Rights to
Payment are and will be correctly  stated in all Records  relating to the Rights
to Payment. Debtor further represents and warrants that each Person appearing to
be obligated on a Right to Payment has authority and capacity to contract and is
bound as it appears to be; and that all chattel paper is in compliance  with law
as to form,  content and manner of  preparation  and  execution and all property
subject  to  chattel  paper has been  properly  registered  and filed to perfect
Debtor's interest.

                 3.6 Retail Merchant. Bank's security interest in any Collateral
consisting  of Inventory is not  restricted by Uniform  Commercial  Code Section
9102 in effect from time to time.

                 3.7  No  Misrepresentation.   No  representation,  warranty  or
statement by Debtor contained in this Agreement, in any Record or certificate or
other writing furnished by Debtor to Bank (including without limitation any made
or given  concerning  the  genuineness,  value and condition of the  Collateral,
financial statements and statements made in documentary  Collateral) at any time
contains  any untrue  statement of material  fact,  or omits to state a material
fact.

                 3.8 Chief Executive Office.  Debtor's chief executive office is
located at:

        Address              City             County         State        Zip
       --------              ----             ------         -----        ---

400 South El Camino Real
         Suite 1200        San Mateo         San Mateo         CA      94402


                                      119





                 3.9 Inventory Location. Other than as set forth in Section 3.8,
Inventory is located at:

        Address              City             County         State        Zip
       --------              ----             ------         -----        --- 

         See Schedule 3.9 attached hereto.




                 3.10 Records Location.  Other than as set forth in Section 3.8,
Records are maintained at:

        Address              City             County         State        Zip
       --------              ----             ------         -----        --- 
         See Schedule 3.9 attached hereto.




                 3.11 Equipment or Fixtures Location. Other than as set forth in
Section 3.8, Equipment or Fixtures are located at:

        Address              City             County         State        Zip
       --------              ----             ------         -----        ---

         See Schedule 3.9 attached hereto.




                 3.12 Other Places of Business. In addition to the locations set
forth in Sections 3.8 through 3.11,  Debtor maintains the following  place(s) of
business:

        Address              City             County         State        Zip
       --------              ----             ------         -----        ---
         See Schedule 3.9 attached hereto.



                                      120



                 3.13  Business  Names.  Debtor has  conducted  business  in the
following names other than the name stated in the preamble to this Agreement:

                                   EMCON, Inc.
                             EMCON Consulting, Inc.
                                EMCON Associates
                              EMCON Southwest, Inc.
                              EMCON Northwest, Inc.
                              EMCON Southeast, Inc.
                           EMCON Baker-Shiflett, Inc.
                           Baker-Shiflett/EMCON, Inc.
                              Baker-Shiflett, Inc.
                                Texas EMCON, Inc.
                            Sweet Edwards/EMCON, Inc.
                               Sweet Edwards, Inc.
                             GWL Environmental, Inc.
                              G. Warren Levy, Inc.
                      Special Environmental Services, Inc.
                  Chattahoochie Geotechnical Consultants, Inc.
                          Wehran/EMCON Northeast, Inc.
                             Wehran Envirotech, Inc.
                         Wehran Engineering Corporation
                       Wehran Technological Services, Inc.
                           Wecon Services Corporation
                      Eldredge Engineering Associates, Inc.
                           Aquila Construction Company
                           Resource Recovery Services
                               Aquila Construction
                         EMCON/United Field Services LLC
                              Wehran-New York Inc.
                               Wehran Puerto Rico
                             ET Environmental Corp.
                             Yolo Landfill Gas Corp.
                        Monterey Landfill Gas Corporation
                        Columbia Analytical Services Inc.
                             Performance Analytical
                          ET Environmental Corporation
                                 EOC Corporation

                 3.14  No  Litigation.   There  is  no  litigation,  tax  claim,
proceeding or dispute pending, or to the knowledge of Debtor, threatened against
or  affecting  Debtor or its  property,  except as  disclosed in writing to Bank
prior to the date of this Agreement.

                                      121


                 3.15 Financing  Statements.  Copies of all financing statements
and all other  documents  publicly  recorded or filed naming Debtor as debtor or
obligor have been delivered to Bank prior to the date of this Agreement.

                 3.16 Hazardous Substances. Except in compliance with applicable
laws,  Debtor's  property  never  has  been,  and  never  will be,  used for the
generation,  manufacture,  storage,  treatment,  disposal, release or threatened
release of any hazardous substance, as those or any similar terms are defined in
the  Comprehensive  Environmental  Response,  Compensation  and Liability Act of
1980, as amended,  42 U.S.C.  Section 9601, et seq.  ("CERCLA")  any  regulation
promulgated  thereunder,  or any state or local law, rule,  regulation or order.
Debtor  hereby  agrees to indemnify  and hold  harmless Bank against any and all
claims and losses resulting from a breach of this provision.

                 3.17 No Default. No Event of Default has occurred or exists.

                        ARTICLE 4 - AFFIRMATIVE COVENANTS

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

                  4.1 Use of Proceeds.  Use the proceeds of any credit  extended
by Bank to  Debtor  only in  accordance  with the terms of any  evidence  of the
Indebtedness and for the purpose indicated on any application for such credit.

                 4.2  Delivery of Certain  Items.  Deliver to Bank  promptly (a)
upon Bank's  request,  duplicate  invoices with respect to each Account  bearing
such  language of  assignment  as Bank shall  specify;  (b) the originals of all
commercial  and standby  letters of credit,  instruments,  documents and chattel
paper constituting Collateral,  endorsed and assigned as Bank shall specify; (c)
after an Event of  Default,  all  Proceeds;  (d) upon Bank's  request,  returned
property resulting from, or payment equal to such allowance or credit on, Rights
to Payment; (e) such specific  acknowledgments,  assignments or other agreements
as Bank may request  relating to the Collateral;  and (f) such Records and other
reports in such form and detail and at such times as Bank may  require  relating
to the Collateral,  including  without  limitation  reports of acquisition,  and
disposition,  agings, and collection of any Collateral.  If any of the Rights to
Payment become evidenced by an instrument,  Debtor will notify Bank thereof and,
upon request by Bank  promptly  deliver such  instrument  to Bank  appropriately
endorsed to the order of Bank as further  security for the  satisfaction in full
of the Indebtedness.

                 4.3  Maintenance  of  Collateral;  Inspection.  Do  all  things
necessary to maintain, preserve, protect and keep all Collateral in good working


                                      122


order and salable  condition,  dealing  with the  Collateral  in all ways as are
considered  good  practice by owners of like  property,  and use the  Collateral
lawfully and only as permitted by Debtor's  insurance  policies.  Debtor  hereby
authorizes Bank's officers, employees, representatives and agents to inspect the
Collateral and to discuss the Collateral and the Records  relating  thereto with
Debtor's officers and employees,  and, in the case of any Right to Payment after
the  occurrence  of an Event of  Default,  with  any  Person  which is or may be
obligated thereon.

                 4.4 Maintenance of Records;  Inspection.  Maintain, or cause to
be maintained,  complete and accurate Records relating to the Collateral.  Bank,
its officers,  employees,  agents and representatives shall have the right, from
time to time, to examine the Records and to make copies or extracts therefrom.

                  4.5 Insurance.  Maintain and keep in force in adequate amounts
such insurance on the Collateral  with companies  acceptable to Bank as is usual
in the  business  carried on by Debtor,  including  fire and  extended  coverage
insurance,  with loss payable to Bank, as Bank may from time to time  reasonably
request.  Furnish  to  Bank  upon  request  the  original  of all  policies,  or
certificates  of insurance on the  Collateral.  Each policy shall be in form and
substance satisfactory to Bank.

                 4.6 Taxes and Other Liabilities.  Pay all Debtor's  obligations
when due; pay all taxes and other governmental or regulatory  assessments before
delinquency or before any penalty attaches  thereto,  except as may be contested
in good faith by the appropriate  procedures and for which Debtor shall maintain
appropriate  reserves;  and timely  file all  required  tax  returns.  Any taxes
(excluding  income  taxes)  payable  or ruled  payable  by any  governmental  or
regulatory  authority  arising out of or in connection with this Agreement shall
be paid by Debtor, together with interest and penalties, if any.

                 4.7 Debtor's  Duty to Give Notice.  Give prompt  notice to Bank
of: (a) any material discount,  credit,  rebate or other reduction in the amount
owing on a Right to Payment;  (b) any material  threatened or asserted  dispute,
setoff,  claim,  counterclaim or defense with respect to a Right to Payment; (c)
any  material  decrease  in the value of any  Collateral  and the amount of such
decrease (other than depreciation  calculated in the ordinary course of business
under  applicable  tax laws and  regulations  and in accordance  with  generally
accepted  accounting  principles);  and(d)  any change in the  ownership  of any
property on which any Collateral is located.

                 4.8 Financing Statements and Other Actions. Execute and deliver
to Bank,  and file or record at  Debtor's  expense,  all  financing  statements,
notices and other  documents  from time to time  requested by Bank to maintain a
first  perfected  security  interest in the  Collateral in favor of Bank, all in
form and substance  satisfactory  to Bank;  perform such other acts, and execute
and deliver to Bank such  additional  conveyances,  assignments,  agreements and
instruments,   as  Bank  may  at  any  time  request  in  connection   with  the
administration  and  enforcement of this Agreement or Bank's rights,  powers and
remedies hereunder.

                                      123


                 4.9  Agreement  With Real Property  Owner/Landlord.  Obtain and
maintain such acknowledgments,  consents, waivers and agreements from the owner,
lienholder,  mortgagee  and landlord  with respect to any real property on which
Collateral  is  located  as  Bank  may  require,   all  in  form  and  substance
satisfactory to Bank.

                         ARTICLE 5 - NEGATIVE COVENANTS

         During  the  term  of  this  Agreement  and  until  payment  of all the
Indebtedness  and  performance  of all  obligations  to Bank,  Debtor  will not,
without the prior written consent of Bank:

                  5.1 Liens.  Create,  incur, assume or permit to exist any Lien
or grant any other  Person a negative  pledge on any  Collateral,  except  Liens
permitted under Section 6.2 of the Credit Agreement.

                 5.2  Documents of Title.  Sign or authorize  the signing of any
financing  statement or other  document  naming Debtor as debtor or obligor,  or
acquiesce or cooperate in the issuance of any bill of lading,  warehouse receipt
or other document or instrument of title with respect to any Collateral,  except
those negotiated to Bank or those naming Bank as secured party.

                 5.3  Disposition  of  Collateral.   Sell,  transfer,  lease  or
otherwise dispose of any Collateral except as permitted under Section 6.5 of the
Credit  Agreement.  Prior  to the  occurrence  of an Event  of  Default,  unless
otherwise agreed between Debtor and Bank, Debtor may use cash Proceeds collected
in the ordinary course of business.

                 5.4 Change in Location,  Name, Legal  Structure.  (a) Unless at
least 30 days' prior  notice  shall have been given to Bank,  change its name or
mailing address, or maintain Records,  its chief executive office, or a place of
business at a location  other than as  specified in Article 3; or (b) change the
nature of its business, or its legal structure.

                 5.5 Certain Agreements on Rights to Payment. Make or arrange to
make any material  discount,  credit,  rebate or other material reduction in the
original amount owing on a Right to Payment or accept in satisfaction of a Right
to Payment an amount materially less than the original amount thereof, except as
disclosed to Bank in writing from time to time.

                          ARTICLE 6 - EVENTS OF DEFAULT

                 6.1 Event of Default.  The  occurrence  of any Event of Default
under the Credit  Agreement  shall  constitute an "Event of Default"  under this
Agreement.

                                      124


                 6.2 Acceleration and Remedies.  Upon the occurrence of an Event
of  Default,  Bank shall be entitled  to, at Bank's  option,  without  notice or
demand of any kind (a) declare all or any part of the  Indebtedness  immediately
due and payable; (b) exercise any or all of the rights and remedies available to
a secured party under the Uniform  Commercial Code or any other  applicable law;
and (c) exercise any or all of Bank's  rights and remedies  provided for in this
Agreement and in any other Loan Document.  The  obligations of Debtor under this
Agreement  shall continue to be effective or be reinstated,  as the case may be,
if at any time any payment of any Indebtedness is rescinded or must otherwise be
returned by Bank upon, on account of, or in  connection  with,  the  insolvency,
bankruptcy or reorganization of Debtor or otherwise,  all as though such payment
had not been made.

                 6.3  Sale of  Collateral.  Bank may sell all or any part of the
Collateral,  at public or private sales,  to itself,  a wholesaler,  retailer or
investor,  for cash,  upon credit or for future  delivery,  and at such price or
prices as Bank may deem commercially reasonable. To the extent permitted by law,
Debtor hereby  specifically  waives all rights of  redemption  and any rights of
stay or appraisal  which it has or may have under any  applicable  law in effect
from time to time.  Any such public or private sales shall be held at such times
and at such  place(s) as Bank may  determine.  In case of the sale of all or any
part of the Collateral on credit or for future delivery,  the Collateral so sold
may be retained by Bank until the selling  price is paid by the  purchaser,  but
Bank shall not incur any  liability in case of the failure of such  purchaser to
pay for the Collateral and, in case of any such failure,  such Collateral may be
resold.  Bank may,  instead of exercising its power of sale,  proceed to enforce
its  security  interest in the  Collateral  by seeking a judgment or decree of a
court of competent jurisdiction.

                 6.4 Debtor's Obligations Upon Default. Upon the request of Bank
after the occurrence of an Event of Default, Debtor will:

                 (a) Assemble and make  available to Bank the Collateral at such
     place(s) as Bank shall  designate,  segregating all Collateral so that each
     item is capable of identification; and

                 (b) Permit  Bank,  by Bank's  officers,  employees,  agents and
     representatives,  to enter any premises where any Collateral is located, to
     take  possession of the  Collateral,  and to remove the  Collateral,  or to
     conduct  any public or private  sale of the  Collateral,  all  without  any
     liability  of Bank for rent or other  compensation  for the use of Debtor's
     premises.

                    ARTICLE 7 - SPECIAL COLLATERAL PROVISIONS

                 7.1 Cash Collateral Account. All cash Proceeds received by Bank
pursuant to any  provisions  of this  Agreement  shall be deposited in a special
non-interest  bearing  collateral  account  established  with Bank,  and will be
applied in  accordance  with Section 7.7.  This account shall be held by Bank as
Collateral.

                                      125


                 7.2   Notification  to  Certain   Obligors  and  Possession  of
Proceeds. Bank may in its sole discretion at any time after the occurrence of an
Event of Default or an event  which with the giving of notice or the  passage of
time or both would  constitute an Event of Default (a) notify or cause Debtor to
notify the  obligors on the Rights to Payment to make  payment to Bank;  and (b)
take possession of any or all Proceeds, which Bank will apply in accordance with
Section 7.7.

                 7.3 Compromise and  Collection.  Debtor and Bank recognize that
setoffs,  counterclaims,  defenses  and other claims may be asserted by obligors
with respect to certain of the Rights to Payment;  that certain of the Rights to
Payment may be or become uncollectible in whole or in part; and that the expense
and  probability of success of litigating a disputed Right to Payment may exceed
the amount that  reasonably may be expected to be recovered with respect to such
Right to Payment.  Debtor hereby authorizes Bank,  effective upon the occurrence
of an Event of Default,  to compromise with the obligor,  accept in full payment
of any Right to Payment such amount as Bank shall negotiate with the obligor, or
abandon  any  Right to  Payment.  Any such  action by Bank  shall be  considered
commercially  reasonable so long as Bank acts in good faith based on information
known to it at the time it takes any such action.

                 7.4 Bank  Performance of Debtor's  Obligations.  Without having
any obligation to do so, Bank may perform or pay any obligation which Debtor has
agreed to perform or pay under this Agreement  including without  limitation the
payment or discharge of taxes or Liens levied or placed on or threatened against
the Collateral.  In so performing or paying,  Bank shall determine the action to
be taken and the amount  necessary to discharge such  obligations.  Debtor shall
reimburse  Bank on demand for any amounts paid by Bank pursuant to this Section,
which amounts shall constitute Indebtedness secured by the Collateral.

                 7.5  Power of  Attorney.  For the  purpose  of  protecting  and
preserving the Collateral and Bank's rights under this Agreement,  Debtor hereby
irrevocably   appoints   Bank,   with  full  power  of   substitution,   as  its
attorney-in-fact  with full power and  authority  to do any act which  Debtor is
obligated  to do  hereunder;  to  exercise  such  rights  with  respect  to  the
Collateral as Debtor might exercise; to use such Inventory,  Equipment, Fixtures
or other property as Debtor might use; to enter Debtor's premises; following the
occurrence of an Event of Default,  to give notice of Bank's  security  interest
in, and to collect the Collateral  and the Proceeds;  and to execute and file in
Debtor's name any financing statements,  amendments and continuation  statements
necessary or desirable to perfect or continue the perfection of Bank's  security
interests in the Collateral. Debtor hereby ratifies all that Bank shall lawfully
do or cause to be done by virtue of this appointment.

                                      126


                 7.6 Authorization for Bank to Take Certain Action. The power of
attorney created in Section 7.5 is a power coupled with an interest and shall be
irrevocable.  The powers  conferred on Bank  hereunder are solely to protect its
interests in the  Collateral and shall not impose any duty upon Bank to exercise
such  powers.  Bank  shall be  accountable  only for  amounts  that it  actually
receives  as a result of the  exercise of such powers and in no event shall Bank
or any of its  directors,  officers,  employees,  agents or  representatives  be
responsible to Debtor for any act or failure to act, except for gross negligence
or willful  misconduct.  Bank may exercise this power of attorney without notice
to or assent of Debtor,  in the name of Debtor, or in Bank's own name, from time
to time in Bank's sole discretion and at Debtor's expense.  To further carry out
the terms of this Agreement, Bank may:

                 (a) Execute any statements or documents or take  possession of,
     and endorse  and  collect  and receive  delivery or payment of, any checks,
     drafts, notes,  acceptances or other instruments and documents constituting
     Collateral, or constituting the payment of amounts due and to become due or
     any performance to be rendered with respect to the Collateral.

                 (b) Sign and endorse any  invoices,  freight or express  bills,
     bills of lading,  storage or warehouse receipts;  drafts,  certificates and
     statements  under any commercial or standby letter of credit;  assignments,
     verifications  and  notices  in  connection  with  Accounts;  or any  other
     documents  relating to the  Collateral,  including  without  limitation the
     Records.

                 (c) Use or operate  Collateral or any other  property of Debtor
     for the purpose of preserving or liquidating Collateral.

                 (d) File any claim or take any other  action or  proceeding  in
     any court of law or equity or as otherwise  deemed  appropriate by Bank for
     the  purpose  of  collecting  any  and  all  monies  due  or  securing  any
     performance to be rendered with respect to the Collateral.

                 (e)  Commence,  prosecute  or  defend  any  suits,  actions  or
     proceedings or as otherwise  deemed  appropriate by Bank for the purpose of
     protecting or collecting the Collateral. In furtherance of this right, upon
     the occurrence of an Event of Default,  Bank may apply for the  appointment
     of a receiver or similar official to operate Debtor's business, and, to the
     fullest extent  permitted by law,  Debtor hereby waives any right to oppose
     such appointment.

                 (f) Prepare, adjust, execute, deliver and receive payment under
     insurance  claims,  and  collect  and  receive  payment of and  endorse any
     instrument in payment of loss or returned  premiums or any other  insurance
     refund or return, and apply such amounts at Bank's sole discretion,  toward
     repayment of the Indebtedness or replacement of the Collateral.

                                      127


                 7.7  Application of Proceeds.  Any Proceeds and other monies or
property  received by Bank  pursuant to the terms of this  Agreement or any Loan
Document may be applied by Bank first to the payment of expenses of  collection,
including without limitation reasonable attorneys' fees, and then to the payment
of  the   Indebtedness   in  such  order  of  application  as  Bank  may  elect.
Notwithstanding  the rights given to Debtor  pursuant to  California  Civil Code
sections  1479  and  2822 or  equivalent  provisions  in the  laws of the  state
specified in the governing  law clause of this  document (and any  amendments or
successors  thereto),  to designate how payments will be applied,  Debtor hereby
waives  such  rights  and Bank shall  have the right in its sole  discretion  to
determine  the order and method of the  application  of payments  received  from
Debtor or from the sale or  disposition  of the  Collateral  and to revise  such
application prospectively or retroactively at its discretion.  The provisions of
this Section 7.7 are subject to the  provisions of Section  2.5(b) of the Credit
Agreement.

                 7.8  Deficiency.  If the  Proceeds  of any  disposition  of the
Collateral are insufficient to cover all costs and expenses of such sale and the
payment  in full of all the  Indebtedness,  plus all other sums  required  to be
expended  or  distributed  by Bank,  then  Debtor  shall be liable  for any such
deficiency.

                 7.9 Bank Transfer.  Upon the transfer of all or any part of the
Indebtedness,  Bank may transfer all or any part of the  Collateral and shall be
fully discharged  thereafter from all liability and responsibility  with respect
to such Collateral so transferred,  and the transferee  shall be vested with all
the rights and  powers of Bank  hereunder  with  respect to such  Collateral  so
transferred,  but with respect to any Collateral not so transferred,  Bank shall
retain all rights and powers hereby given.

                 7.10 Bank's Duties.

                     (a) Bank's sole duty with respect to the  Collateral in its
     possession  shall be to use reasonable care in the custody and preservation
     thereof.  Bank  shall be deemed to have  exercised  reasonable  care in the
     custody and  preservation of such Collateral if such Collateral is accorded
     treatment  substantially equal to that which Bank accords its own property,
     it being  understood  that  Bank  shall  not have  any  responsibility  for
     ascertaining   or  taking  action  with  respect  to  calls,   conversions,
     exchanges,  maturities,  declining value, tenders or other matters relative
     to any  Collateral,  regardless  of  whether  Bank has or is deemed to have
     knowledge of such matters;  or taking any  necessary  steps to preserve any
     rights  against  any  Person  with  respect  to any  Collateral.  Under  no
     circumstances  shall  Bank be  responsible  for any  injury  or loss to the
     Collateral,  or any  part  thereof,  arising  from  any  cause  beyond  the
     reasonable control of Bank.



                                      128


                     (b) Bank may at any time deliver the Collateral or any part
     thereof to Debtor and the  receipt of Debtor  shall be a complete  and full
     acquittance for the Collateral so delivered,  and Bank shall  thereafter be
     discharged from any liability or responsibility therefor.

                         ARTICLE 8 - GENERAL PROVISIONS

                 8.1 Notices.  Any notice given or required under this Agreement
shall be given in the manner specified in the Credit Agreement.

                 8.2  Binding  Effect.  This  Agreement  shall be  binding  upon
Debtor, its permitted  successors,  representatives and assigns, and shall inure
to the benefit of Bank and its successors,  and assigns;  provided  however that
Debtor may not assign or  transfer  Debtor's  obligations  under this  Agreement
without the prior  written  consent of Bank.  Bank  reserves  the right to sell,
assign,  or transfer its rights and powers  under this  Agreement in whole or in
part  without  notice to  Debtor.  In that  connection,  Bank may  disclose  all
documents and information  which Bank now or hereafter may have relating to this
Agreement,  Debtor or  Debtor's  business,  provided  that any such  assignee or
transferee  executed a  confidentiality  agreement  reasonably  satisfactory  to
Debtor.

                 8.3 No Waiver.  Any waiver,  consent or approval by Bank of any
Event of Default  or breach of any  provision,  condition  or  covenant  of this
Agreement or any Loan Document must be in writing and shall be effective only to
the extent  set forth in  writing.  No waiver of any breach or default  shall be
deemed a  waiver  of any  later  breach  or  default  of the  same or any  other
provision of this Agreement or any of the Loan  Documents.  Any failure or delay
on the part of Bank in  exercising  any  power,  right or  privilege  under this
Agreement or any Loan Document shall not operate as a waiver thereof,  nor shall
any single or partial  exercise of any such power,  right or privilege  preclude
any further exercise thereof.

                 8.4 Rights  Cumulative.  All rights and remedies existing under
this  Agreement  are  cumulative  to, and not  exclusive of, any other rights or
remedies available under contract or applicable law.

                 8.5 Unenforceable  Provisions.  Any provision of this Agreement
which is prohibited or unenforceable in any jurisdiction  shall be so only as to
such   jurisdiction   and   only  to  the   extent   of  such   prohibition   or
unenforceability,  but all the  remaining  provisions  of this  Agreement  shall
remain valid and enforceable.

                 8.6 Governing Law/Waiver or Notice.  Except as may be otherwise
provided  by the  Uniform  Commercial  Code  or in  any  addendum  hereto,  this
Agreement  shall be governed by and construed in accordance with the laws of the


                                      129


State of California.  Debtor hereby waives presentment,  demand, protest, notice
of dishonor and all other notices and demands, as well as any applicable statute
of limitations.

                 8.7 Indemnification.  Debtor shall pay and protect,  defend and
indemnify  Bank  and  Bank's  employees,   officers,  directors,   shareholders,
affiliates,   correspondents,  agents  and  representatives  (other  than  Bank,
collectively "Agents") against, and hold Bank and each such Agent harmless from,
all claims,  actions,  proceedings,  liabilities,  damages,  losses, and related
expenses  (including,  without limitation,  attorneys' fees and costs) and other
amounts  incurred  by Bank  and  each  such  Agent,  arising  from  the  matters
contemplated by this Agreement;  provided,  however,  that this  indemnification
shall not apply to any of the foregoing  incurred solely as the result of Bank's
or any Agent's gross  negligence  or willful  misconduct.  This  indemnification
shall survive the payment and  satisfaction  of all of Debtor's  obligations and
liabilities to Bank.

                 8.8  Reimbursement.  Debtor shall  reimburse Bank for all costs
and  expenses,  including  without  limitation  reasonable  attorneys'  fees and
disbursements  (and fees and  disbursements of Bank's in-house counsel) expended
or incurred by Bank in any arbitration,  mediation,  judicial  reference,  legal
action  or  otherwise  in  connection  with  (a) the  negotiation,  preparation,
amendment,  interpretation and enforcement of this Agreement,  including without
limitation during any workout,  attempted workout, and/or in connection with the
rendering of legal advice as to Bank's rights,  remedies and  obligations  under
this  Agreement,  (b)  collecting  any sum which  becomes  due Bank  under  this
Agreement,  (c) any proceeding for declaratory  relief,  any counterclaim to any
proceeding, or any appeal, or (d) the protection, preservation or enforcement of
any rights of Bank.  For the  purposes of this  section,  attorneys'  fees shall
include, without limitation, fees incurred in connection with the following: (1)
contempt  proceedings;  (2)  discovery;  (3) any  motion,  proceeding  or  other
activity of any kind in connection with a bankruptcy  proceeding or case arising
out of or relating to any petition  under Title 11 of the United States Code, as
the  same  shall be in  effect  from  time to  time,  or any  similar  law;  (4)
garnishment,   levy,   and  debtor  and  third  party   examinations;   and  (5)
post-judgment  motions and proceedings of any kind, including without limitation
any activity taken to collect or enforce any judgment.

                 8.9 Entire Agreement.  This Agreement is intended by Debtor and
Bank as the final expression of Debtor's  obligations to Bank in connection with
the Collateral and supersedes all prior understandings or agreements  concerning
the subject  matter  hereof.  This  Agreement  may be amended  only by a writing
signed by Debtor and accepted by Bank in writing.






         IN WITNESS  WHEREOF,  Debtor has executed this Agreement as of the date
set forth in the preamble.

                               EMCON, a California corporation


                               By:      /s/
                                      ---------------------
                               Name:  R. Michael Momboisse

                               Title: CFO & V.P. - Legal

                                      130