EXHIBIT 10.2

                                CREDIT AGREEMENT



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

                            ARTICLE ONE - DEFINITIONS

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

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

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

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

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

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

"Closing Date" means the date of this Agreement.

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

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

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

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

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

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

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

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

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

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

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

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

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

"OWT" means Organic Waste Technologies, Inc.

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

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

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

"Permitted Liens" means:

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

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

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

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

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


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

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

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

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

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

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

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

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

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

                 ARTICLE TWO - THE FACILITIES AND RELATED TERMS
                                 AND CONDITIONS

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

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2.1      The Facilities.

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

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

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

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

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

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

2.2      Requests for Advances and Method of Advancing.

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

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

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

2.3      Interest On The Facilities.

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

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


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

2.4      Interest Rate Related Terms & Provisions.

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

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

         (c)      Prepayment.

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

                           (ii)  Mandatory Prepayments of Term Loan.

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


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

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

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

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


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

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

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

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

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

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

2.6      Fees On The Facilities.

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

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

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

2.7      Security.

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

                 ARTICLE THREE - REPRESENTATIONS AND WARRANTIES

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

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

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

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


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

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

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

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

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

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

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

                       ARTICLE FOUR - CONDITIONS PRECEDENT

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

                                      100


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

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

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

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

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

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

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

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

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

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

                                      101


4.3      Conditions Subsequent.

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

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

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

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

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

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

                      ARTICLE FIVE - AFFIRMATIVE COVENANTS

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

                                      102


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

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

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

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

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

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

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

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

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

         (c)      Any Event of Default.

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

                                      103


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

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

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

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

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


                                      104


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

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

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

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

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

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

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

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

                                      105


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

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

                        ARTICLE SIX - NEGATIVE COVENANTS

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

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

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

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

         (c)      The indebtedness of Borrower under this Agreement;

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

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

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


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

                                      106


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

         (b)      Liens in favor of Bank;


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

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

         (e)      Permitted Liens.

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

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

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


                                      107


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

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

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

         (a)      Those permitted under Section 6.7;

         (b)      The OWT Acquisition;

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

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

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

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

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

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

                                      108


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

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

         (e)      Securities of the United States Government;

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

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

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

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

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

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

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

                                      109


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


                        ARTICLE SEVEN - EVENTS OF DEFAULT

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

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

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

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

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

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


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

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

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

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

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

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

                       ARTICLE EIGHT - GENERAL PROVISIONS

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

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To Borrower:                                         To Bank:

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


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

8.2      Dispute Resolution.

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

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


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

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

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

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

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


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

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

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

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

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

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

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


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

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

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

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

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


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

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