EMCON
10-K, 1999-03-29
ENGINEERING SERVICES
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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    FORM 10-K


(Mark One)
[X]     ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
        ACT OF 1934 [FEE REQUIRED]

        For the fiscal year ended December 31, 1998

                                       OR

[    ]  TRANSITION   REPORT  PURSUANT TO  SECTION 13 OR 15(d)  OF THE SECURITIES
        EXCHANGE ACT OF 1934

                         Commission file number 0-16225
                                      EMCON
             (Exact name of Registrant as specified in its charter)

     California                                         94-1738964
(State or other jurisdiction of                       (I.R.S. Employer
incorporation of organization)                        Identification No.)

400 South El Camino Real
Suite 1200
San Mateo, California                                      94402
(Address, of principal executive offices)                (Zip Code)

Registrant's telephone number, including area code     (650) 375-1522

Securities registered pursuant to Section 12(b) of the Act:
                                                   
                                                    Name of each exchange
            Title of each class                      on which registered
            -------------------                     ---------------------
                  None                                      None

Securities registered pursuant to Section 12(g) of the Act:

                                  Common Stock
                                (Title of Class)

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. Yes X No ____



                                       1
<PAGE>

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.

The  aggregate  market  value  of the  voting  stock of the  Registrant  held by
non-affiliates of the Registrant, based on the closing price of the Registrant's
Common  Stock as quoted  by the  National  Association  of  Securities  Dealers'
Automated  Quotation System on March 1, 1999, was $23,174,519.  Shares of Common
Stock held by each  officer and  director and by each person who owns 5% or more
of the  outstanding  Common Stock have been excluded in that such persons may be
deemed  to  be  affiliates.  This  determination  of  affiliate  status  is  not
necessarily a conclusive determination for other purposes.

The number of shares of the Registrant's Common Stock outstanding as of February
26, 1999, was 8,317,649.

                       DOCUMENTS INCORPORATED BY REFERENCE

Parts of the  Registrant's  definitive  proxy  statement  to be  filed  with the
Commission within 120 days of the end of Registrant's fiscal year ended December
31, 1998 are incorporated by reference in Part III of this Form 10-K.

The Index to Exhibits appears on Page 47 of this Report.  This Report, including
all exhibits and attachments, contains 113 pages.




                                       2
<PAGE>


                                TABLE OF CONTENTS

PART I                                                                 PAGE
  Item   1:             Business...................................      4

  Item   2:             Properties.................................      9

  Item   3:             Legal Proceedings..........................     10

  Item   4:             Submission of Matters to a Vote of Security 
                        Holders....................................     10

PART II
  Item   5:             Market for the Registrant's Common Equity 
                           and Related Stockholder Matters.........     11

  Item   6:             Selected Financial Data....................     12

  Item   7:             Management's Discussion and Analysis of 
                           Financial Condition and Results of
                           Operations..............................     13

  Item   8:             Financial Statements and Supplementary 
                           Data....................................     18

  Item   9:             Changes in and Disagreements with Accountants 
                           on Accounting and Financial Disclosure..     43

PART III
  Item 10:              Directors and Executive Officers of the 
                           Registrant..............................     43

  Item 11:              Executive Compensation.....................     43

  Item 12:              Security Ownership of Certain Beneficial 
                           Owners and Management..................      43

  Item 13:              Certain Relationships and Related 
                           Transactions...........................      43

PART IV
  Item 14:              Exhibits, Financial Statement Schedules, 
                           and Reports on Form 8-K................      44

                        Signatures................................      45



                                       3
<PAGE>

                                     PART I

Item 1.       Business

EMCON (referred to herein as "EMCON" and the "Company")  provides  comprehensive
environmental engineering, design, construction, operations and maintenance, and
equipment fabrication services to a variety of public and private industrial and
solid waste clients.  The Company is comprised of two reporting  segments -- the
Operation and Construction Division (EOC) and the Professional Services Division
(PSD) -- and services three key service lines: Solid Waste, Site Restoration and
Facility Services.

EMCON is a leader  in the  design,  construction  and  remediation  of solid and
hazardous waste facilities,  having participated in the design, construction and
remediation of several hundred transfer,  storage and disposal facilities in the
United  States,  as well as  Argentina,  Canada,  Hong Kong,  India,  Indonesia,
Israel,  Kuwait,  Malaysia,  Russia,  Saudi Arabia,  Mexico, Peru and Venezuela.
EMCON's solid waste  services  include site selection and  evaluation,  facility
design,  development of preprocessing  and operating  facilities,  assistance in
regulatory  compliance  and  permitting,  final  closure,  end-use  planning and
design,  construction,  and operations and maintenance.  The Company's  services
also include the development of programs dealing with environmental  assessments
and  remediation of contaminated  sites, as well as services  related to applied
sciences such as fuel spill damage assessment,  marine  fate-and-effect  studies
and  natural  resource  damage  assessment.  The  Company's  professional  staff
includes chemical, civil, geotechnical, mechanical, electrical and environmental
engineers; marine and terrestrial biologists;  ecologists; chemists; geologists;
hydrogeologists;  hydrologists;  industrial hygienists;  toxicologists; computer
programmers;  planners and  regulatory  analysts.  References to the Company and
EMCON in this report  include  the  Company's  subsidiaries,  unless the context
indicates otherwise.

On April  3,  1998,  EMCON  acquired  all of the  outstanding  capital  stock of
Advanced Analytical  Solutions,  Inc. ("A2S"), a provider of alternative dispute
resolution,  cost  allocation,  cost recovery,  and litigation  support services
primarily  for  superfund  projects.  A2S has  offices in Denver,  Colorado  and
Philadelphia,  Pennsylvania. The Company purchased A2S for $593,000 in stock and
$601,000 in cash and direct acquisition costs. The transaction was accounted for
as a purchase.  Goodwill of  approximately  $1,150,000 is being  amortized  over
twenty  years  using  the  straight-line  method.  Accumulated  amortization  at
December 31, 1998, was approximately  $43,000.  Additional  consideration may be
paid  for the  purchase  of A2S  subject  to the  achievement  of  predetermined
operating  performance  goals over the next two years. The acquisition would not
have had a material affect on consolidated  net revenue,  net income or earnings
per share, had it been effective at January 1, 1998.

On December 4, 1998,  Organic Waste  Technologies,  Inc. ("OWT"), a wholly-owned
subsidiary of EMCON,  acquired all of the  outstanding  capital stock of Western
Industrial Resources Corporation ("WI"), an industrial  maintenance  outsourcing
firm based in Arizona. The Company purchased WI for $155,000 in cash and assumed
liabilities  in excess of assets  acquired  of  $103,000.  The  transaction  was
accounted  for as a  purchase.  Goodwill  of  approximately  $258,000  is  being
amortized   over  ten  years  using  the   straight-line   method.   Accumulated
amortization  at  December  31,  1998,  was  approximately  $1,000.   Additional
consideration  may be paid for the purchase of WI subject to the  achievement of
predetermined  operating  performance  goals  over the  next  three  years.  The
acquisition  would not have had a material affect on  consolidated  net revenue,
net income, or earnings per share, had it been effective at January 1, 1998.



                                       4
<PAGE>

                                    Services

The Company is comprised of two reportable segments:  the Professional  Services
Division (PSD);  and the Operations and Construction  Division (EOC).  These two
reportable  segments  work in  concert  to  address  the needs of the  Company's
clients in three key service lines:  Solid Waste,  Site Restoration and Facility
Services.

Solid Waste Services: The Company's Professional Services Segment and Operations
and  Construction  Segment  offer a full range of services to operators of solid
and hazardous waste transfer,  storage, recycling, and disposal facilities; from
the design,  permitting and construction of the facility,  to the fabrication of
necessary equipment and components, to post-closure,  operations and maintenance
services and end-use planning. Customers may utilize the full range or a portion
of the Company's services.

Through its extensive  experience in the solid waste  industry,  the Company has
developed  expertise in several  critical areas of waste  disposal  technology -
landfill cells and related  infrastructure,  liner systems,  leachate treatment,
and gas control/recovery systems. To protect surrounding soil and water, natural
and  synthetic  liners are used to collect  and  contain  potentially  hazardous
liquids  percolating  through  the waste  that have been  deposited  at the site
("leachate").  Leachate is then collected on the surface of the liner, withdrawn
from the landfill  and treated  using  physical,  chemical,  evaporative  and/or
biological methods. Gas control and recovery systems,  which may be installed on
active or closed  landfills,  are used to control the  methane  gas  produced by
decomposing organic refuse.  Where economical,  recovery systems are designed to
extract  methane  to  generate  heat  and/or  electricity,  or in some  cases to
evaporate leachate using the Company's patented leachate evaporation technology.
Federal  regulation  now  requires  that all new  landfill  disposal  facilities
utilize liners and methane control  systems,  and that these systems be required
to meet increasingly stringent design standards.

EMCON's  services to its solid waste clients often begin with the  evaluation of
potential disposal facility sites. The hydrogeological and geotechnical staff of
the Professional  Services Division evaluate soils,  groundwater  occurrence and
quality,  seismic stability and potential flooding at possible locations,  while
other professionals analyze operational  considerations,  such as proximity of a
site  to  water  sources,  visibility  to the  public  and  estimated  operating
expenses. Once desirable sites are identified,  the Company assists in obtaining
regulatory  approvals  by  drafting  environmental  impact  reports  and  permit
applications, appearing at hearings and negotiating with government agencies.

EMCON performs detailed cost/benefit analyses of design alternatives,  using, if
possible,  natural  features of the site to reduce cost.  EMCON engineers design
the waste disposal facility, considering such factors as the volume and types of
material  to be  disposed  at the site,  land use and  public  policy,  physical
characteristics  of the site and regulatory  requirements.  EMCON identifies the
type of natural or synthetic  liners which are  appropriate  or required for the
site and designs  the  monitoring  systems,  landfill  gas  control  systems and
leachate  recovery and  treatment  systems.  EMCON also  monitors  statutory and
regulatory  developments,  and assists operators in implementing required design
or  operating  changes  and  preparing   additional   permit   applications  and
environmental reports.

Throughout the construction process, the Professional Services Division performs
services  such  as  preparing  detailed  construction  documents,  assisting  in
contractor  selection,  scheduling and monitoring  work in progress,  performing
construction quality assurance review, review of contractor requests for payment
and assisting with regulatory compliance and permitting. The Company also trains
disposal facility personnel,  performs  environmental  monitoring services,  and
designs site maintenance programs and operating plans.



                                       5
<PAGE>

Where appropriate,  the Operations and Construction Division can perform a broad
range of related services,  including  construction of landfill cells,  landfill
remediation and collection systems, landfill gas flares and control systems, and
leachate  evaporation systems, as well as the capping,  closure,  development of
landfill gas recovery projects,  and long-term  operation and maintenance of old
landfills.  The  Company is also  seeing  more  opportunities  to provide  fully
integrated  design-build projects,  utilizing the combined solid waste expertise
of PSD and EOC.

The Operations and  Construction  Division is complimented  by ET  Environmental
Corporation  ("ET"),  a  50/50  joint  venture  between  EMCON  and  The  Turner
Construction   Company   ("Turner").   ET's  charter  is  to  provide  primarily
above-ground  environmental,  remedial and  construction  services on a national
basis,  utilizing the regional  resources of EMCON and Turner. ET is a leader in
the development and construction of solid waste transfer  stations and materials
recovery facilities on a design build basis.

Site  Restoration  Services:   EMCON's  environmental   expertise   incorporates
analytical and risk-assessment  capabilities enabling remediation specialists to
design  site-specific  solutions to environmental  compliance and  contamination
problems.  The Company is often  called  upon to design and monitor  remediation
plans when corrective  action is required at solid or hazardous waste storage or
disposal facilities and at commercial or industrial plant sites.  Problems which
may require  remediation  include leaching of hazardous chemicals or wastes into
groundwater,  ground instability or erosion,  flooding and migration of landfill
gas. Work generally entails site  reconnaissance,  drilling exploratory borings,
and soil and groundwater sampling as part of the assessment program.  Using data
collected  in the  assessment  phase of a project,  the Company then defines the
nature and extent of the problem,  develops a  remediation  program and monitors
its implementation.

The Company  generally  approaches site restoration  projects by consulting with
the client on the nature and scope of the problem.  Historical information about
the site,  if available,  is reviewed to determine  the most likely  sources and
locations of contamination. Information about the local geology and hydrogeology
is also reviewed to determine potential migration pathways. A detailed work plan
is then prepared that describes the field investigation program to be conducted,
including  the number and location of samples to be  collected  and the specific
chemical  analyses to be  performed.  Trained  personnel  then conduct the field
investigation  program,  which may include  drilling  soil  borings,  installing
groundwater  monitoring  wells,  and  collecting  samples of soil,  groundwater,
surface water and/or industrial discharges.

Following laboratory analysis of the various samples collected,  the results are
evaluated by Company engineers and scientists to determine the nature and extent
of contamination at the site.  Depending on the complexity of the site, this may
require more than one round of sampling. Site cleanup levels are then determined
based on the media that have been impacted,  the  contaminants  of concern,  the
intended use of the property, and state and federal regulations. In consultation
with the  client,  various  remediation  alternatives  are then  identified  and
evaluated for  implementability,  effectiveness,  permanence and cost.  Remedial
alternatives  at a site may include the excavation and removal of the sources of
contamination  and  contaminated  soil, the removal and treatment of groundwater
using physical and chemical  treatment  systems,  or the installation of surface
caps and vertical hydraulic barriers.  EMCON also applies in-situ  technologies,
such  as  vapor  extraction  or  bioremediation  as  appropriate,  to  remediate
contaminated  soils  and  groundwater  as a means to  reduce  cost and  minimize
disturbance. To assure continued compliance during and after remediation,  EMCON
designs  and  provides   operations  and   maintenance   programs  for  affected
facilities.

Through its ET joint venture with Turner,  the Company is also able to provide a
complete turnkey package to clients,  combining  planning and  implementation of
facility/plant   decommissioning;    remediation   of   soil   and   groundwater
contamination, and lead based paint and asbestos abatement.



                                       6
<PAGE>


Facility  Services:  In the last several years the market has seen a significant
trend among many of the larger  industrial  clients to outsourcing many of their
environmental,  regulatory,  health and safety  compliance and plant maintenance
requirements.  EMCON  services  this niche by offering  stand-alone  and bundled
plant packages wrapped around client's industrial operations.

Air Quality:  Air emission permits;  emission credit trading (specified states);
air  quality  modeling;  source  monitoring  and  inventory  services;  exposure
monitoring; risk analysis; and air quality control system designs.

Water/Waste  Water:  Industrial  process  wastewater  evaluation  and  treatment
design;  toxicity  reduction  evaluations;  storm water  monitoring and control;
NPDES permits and monitoring;  wastewater  source  assessments;  receiving water
studies; industrial pretreatment packages and; operations of related systems.

Health and Safety:  Training;  site specific plans; indoor exposure evaluations;
noise and  ergonomics;  accident  investigations;  development of process safety
evaluation;  OSHA compliance;  emergency response plans;  respiratory/health and
hazard communication; and industry specific assessment and training.

Regulatory Compliance: Multimedia audits; environmental risk assessments; agency
negotiations; compliance packages; and oversight of programs.

Environmental Management Consulting:  Development and implementation of EMS' for
ISO  14001   certification;   translating   regulatory   requirements  into  job
procedures/processes.

Environmental management Information Systems:  Manifest tracking software; point
source solutions;  groundwater  monitoring tools; data management and regulatory
compliance products; regulatory analysis and summary web based packages; and EMS
and GIS Key products.

Information   Technology  Services:   Network  system  integration;   e-Commerce
consulting,  web design and web-based training;  and related  equipment/software
packages.

Industrial Maintenance:  Outsourcing scheduled and emergency fabrication,  plant
improvement, facility and pipeline maintenance; HVAC and hydraulics maintenance,
specialty welding; and equipment relocations.

                              Clients and Marketing

EMCON's  principal clients are industrial  concerns,  predominantly in the solid
waste,  petroleum,  wood products,  aerospace,  power generation,  chemicals and
manufacturing  industries.  The Company  also  provides  services to  utilities,
non-regulatory  government  entities,  and financial  institutions.  The Company
often enters into master service agreements with major clients,  which set forth
the general  terms and  conditions  under which EMCON will perform  services and
which facilitate repeated use of the Company's services.

EMCON focuses significant efforts on providing high quality services in a timely
manner and developing long-term relationships with its clients. EMCON assigns an
experienced project manager to each project to coordinate work undertaken by the
numerous  professionals  from  different  disciplines  within the Company.  This
approach  reduces the time and cost  required to complete a project and relieves
the client of the  responsibility  of  coordinating  the efforts of  independent
consultants.  Because  the  Company  provides a broad  range of  services,  work
performed  for a  client  in one  technical  area  often  leads to work in other
technical areas.


                                       7
<PAGE>


In the last  several  years,  an  increasing  amount  of work has been done on a
competitive  bid basis in response to client  requests for  proposals.  This has
required the dedication of significantly  greater  resources to proposal writing
and  general  business  development,  and the  implementation  of a more  formal
marketing program to share leads and coordinate resources nationwide.

To further  promote its  services,  the Company takes an active role in industry
trade associations to enhance its national  reputation for technical  expertise.
Similarly, EMCON provides services to a wide variety of local, state and federal
government  agencies and  contractors.  Participation  in such contracts  allows
EMCON to remain on the leading  edge of new  technological  developments  and to
publicize its expertise.

                                   Regulation

Public  concern over health,  safety and  preservation  of the  environment  has
resulted in the enactment of a broad range of environmental laws and regulations
by  local,  state  and  federal  lawmakers  and  agencies.  These  laws  and the
implementing  regulations affect nearly every industry,  as well as the agencies
of  federal,  state  and  local  governments  charged  with  their  enforcement.
Recently,   the  level  of  enforcement  has  waned  given  governmental  budget
constraints and a number of environmental laws set for renewal have been allowed
to lapse.  Nonetheless,  those laws and regulations still in force will continue
to  stimulate  demand  for the kinds of  services  offered  by EMCON.  They also
subject the Company to stringent regulation in the conduct of its operations.

                        Potential Liability and Insurance

The Company's work involves assisting clients in handling, storing and disposing
of  hazardous  materials,  toxic  wastes  and other  pollutants,  as well as the
remediation  of existing  contamination.  The Company  therefore is exposed to a
significant risk of professional liability for environmental damage and personal
injury.

EMCON maintains health and safety and quality assurance/quality control programs
to  reduce  the  risk of  potential  damage  to  persons  and  property  and the
associated   potential  liability.   In  addition,   EMCON  currently  maintains
professional  liability  insurance  (covering  damages  resulting from negligent
acts,  errors,  mistakes  or  omissions  in  rendering  or failing to render its
professional  services)  as  well  as  commercial  general  liability  insurance
(covering bodily injury and property damage).

EMCON endeavors contractually to limit its potential liability to the amount and
terms of its  insurance  policies,  and to be  indemnified  by its clients  from
potential liability to third parties. However, the Company is not always able to
obtain such  limitations on liability or  indemnification,  and such provisions,
when  obtained,   may  not  adequately   shelter  the  Company  from  liability.
Consequently,  a partially or completely  uninsured  claim, if successful and of
sufficient  magnitude,  could have a material  adverse effect on the Company and
its financial condition and results of operations.

Although the  liabilities  arising out of  environmental  laws are more directly
applicable  to the Company's  clients,  such laws could,  under certain  factual
circumstances,  apply to some of the  activities  pursued by the  Company in the
course of business,  including failure to properly design a cleanup,  removal or
remedial  action  plan or failure  to  achieve  required  cleanup  standards  in
compliance  with  such laws and  standards.  Such  liabilities  can be joint and
several where other parties are involved. Because much of the Company's business
is  generated  either  directly or  indirectly  as a result of federal and state
governmental   programs  and  regulations,   changes  in  governmental  policies
affecting such programs, or regulations or administrative  actions affecting the
funding or sponsorship of such programs, could have a material adverse effect on
the Company's business. See Item 3 - Legal Proceedings.


                                       8
<PAGE>

                                   Competition

EMCON competes  directly with a wide variety of national and local  engineering,
consulting,  construction,  equipment,  and operations and maintenance companies
which offer services similar to those provided by the Company.  However, many of
these  competitors  are only  engaged  in  certain  segments  of the  applicable
industry and do not provide the broad range of services provided by the Company.
In addition,  the Company competes  indirectly with remediation  companies which
offer   environmental   consulting  and   engineering   services,   as  well  as
transportation,  storage or  disposal  capabilities  generally  not  provided by
EMCON.  The  Company  believes  that the  principal  competitive  factors in its
industry are price, reputation, technical proficiency, management experience and
breadth of services  offered.  The industry has also  experienced  a significant
amount of consolidation activity.  Management anticipates that these trends will
continue for the foreseeable future.

                                    Employees

As of December 31, 1998, the Company had a total of 1,088  employees,  including
525 technical  professionals;  404 construction,  operations and maintenance and
field technicians;  and 159 administrative and support personnel.  The Company's
professional  staff  includes   chemical,   civil,   geotechnical,   mechanical,
electrical  and  environmental  engineers;  marine and  terrestrial  biologists;
oceanographers;   plant  ecologists;   chemists;  geologists;   hydrogeologists;
hydrologists;  toxicologists and construction and field personnel. The Company's
ability  to  attract  and  retain  qualified  engineers,  scientists  and  other
professionals is an important factor in determining its future success.  EMCON's
employees have never been  represented by a union,  and the Company believes its
relations with its employees are good.

                                   Seasonality

EMCON's business has experienced an increase in seasonality in recent years, due
in part to the increase in on-site  investigation,  construction and other field
work.  Consequently,  the consolidated financial results in its second and third
quarters  (ending June 30 and  September 30,  respectively)  tend to be stronger
than such results in its first and fourth quarters.

                                     Backlog

The Company  estimates  that at  December  31,  1998,  the backlog of future net
revenue from contracts in existence and orders believed to be firm was in excess
of $75 million,  all of which is expected to be received  within the next twelve
months, compared to $75 million backlog at December 31, 1997. However, there can
be no assurance that this work will not be postponed or canceled. Furthermore, a
substantial portion of the Company's work is performed pursuant to agreements by
which the Company is compensated for time and expenses  devoted to projects with
indefinite lives.

Item 2.       Properties

The  Company's  corporate  office,  located in San Mateo,  California,  occupies
approximately  3,000 square feet and is leased through July, 2001. The Company's
accounting center,  located in Sacramento,  California,  occupies  approximately
4,000 square feet and is leased through December 31, 2000.

The  Company  owns 4.4 acres of real  property in Kelso,  Washington,  including
37,000  square  feet of office and  analytical  lab space.  The  facilities  are
currently leased to Columbia Analytical Services, Inc. ("CAS") under a long term
lease  expiring April 3, 2007. The Company also owns a 10 acre piece of property
in New  Concord,  Ohio,  including  30,000  square feet of office and  equipment
fabrication facilities.


                                       9
<PAGE>


The  Company  leases  office  and  warehouse  space in a total of 50  facilities
located in Alaska, Arizona, California, Colorado, Connecticut, Florida, Georgia,
Illinois, Iowa, Maine, Maryland, Massachusetts,  Michigan, New Jersey, New York,
Ohio, Oregon, Pennsylvania, Puerto Rico, Texas, Vermont, Virginia and Washington
under leases expiring at various times through December 2003.
These facilities have a combined area of approximately 345,500 square feet.

Item 3.       Legal Proceedings

As a firm  engaged in  environmental-related  matters,  the  Company  encounters
potential liability,  including claims for significant  environmental damage, in
the normal course of business.  The Company is party to lawsuits and is aware of
potential exposure related to certain claims. In the opinion of management,  the
resolution  of all known  lawsuits/claims  at amounts  in excess of  established
reserves will not have a material  adverse affect on the Company's  consolidated
financial position, results of operations or cash flows.

Item 4.       Submission of Matters to a Vote of Security Holders

There were no matters  submitted  to a vote of the security  holders  during the
fourth quarter of the fiscal year ended December 31, 1998.





                                       10
<PAGE>

                                     PART II

Item 5.       Market for  the Registrant's Common Equity and Related Stockholder
              Matters

The Company's  common stock is traded on the NASDAQ National Market System under
the symbol MCON. The following  table sets forth the quarterly range of high and
low bid quotations per quarter for 1998 and 1997:
<TABLE>
<CAPTION>

- - -------------------------------------------------------------------------------------------------------------------------------
                                                                                                  High               Low
- - -------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                             <C>                 <C> 
January 1 - March 31, 1997                                                                      3.75                3.00
April 1 - June 30, 1997                                                                         4.06                2.88
July 1 - September 30, 1997                                                                     5.50                3.13
October 1 - December 31, 1997                                                                   6.88                4.63

January 1 - March 31, 1998                                                                      5.13                4.63
April 1 - June 30, 1998                                                                         5.25                3.31
July 1 - September 30, 1998                                                                     5.13                2.81
October 1 - December 31, 1998                                                                   3.50                2.50
- - -------------------------------------------------------------------------------------------------------------------------------
</TABLE>

On January 1, 1999,  there were 1,771  shareholders  of record of the  Company's
common stock.

Although the Company does make annual distributions to a minority shareholder of
one of OWT's  subsidiaries,  the  Company  did not pay cash  dividends  to EMCON
shareholders  in 1998 or 1997 and does  not  plan to pay cash  dividends  to its
shareholders in the near future.  Furthermore,  the payment of cash dividends is
restricted  by the  Company's  bank  line of  credit  arrangement.  The  Company
presently intends to retain earnings for further development of its business.



                                       11
<PAGE>


Item 6.       Selected Financial Data

Five Year Financial Highlights
<TABLE>
<CAPTION>

- - ------------------------------------------------------------------------------------------------------------------
                                                                         Years Ended December 31,

                                                ------------------------------------------------------------------
(In thousands, except per share amounts)            1998          1997         1996         1995         1994
- - ------------------------------------------------------------------------------------------------------------------
<S>                                               <C>           <C>          <C>          <C>          <C>  
Operations Statement Data (a)
Gross revenue                                     $151,348      $139,343     $137,626     $122,542     $115,638
Net revenue                                        129,960       109,502      117,705      103,409       95,926
Direct expenses                                     76,749        56,134       52,608       39,473       37,307
Indirect expenses                                   49,373        49,782       65,844       61,498       59,302
Restructuring/other charges                             (4)       (1,612)       8,197          (17)       1,958
Loss on disposition of laboratory                       --           333        3,327           --           --
Income (loss) from operations                        3,842         4,865      (12,271)       2,455       (2,641)
Interest income                                        548           516          317          369          348
Interest expense                                     1,234         1,251        1,112          181           66
Equity in income (loss) of affiliates                  (15)           (2)         227          (74)         (58)
Minority interest expense                               --           810          188           --           --
Income (loss) before provision (benefit) for
   income taxes                                      3,141         3,318      (13,027)       2,569       (2,417)
Provision (benefit) for income taxes                 1,508         1,161       (2,936)         783         (500)
Net income (loss)                                    1,633         2,157      (10,091)       1,786       (1,917)
- - ------------------------------------------------------------------------------------------------------------------
Per Share Data (a)
Basic earnings (loss) per share                  $    0.19     $    0.25       $(1.19)   $    0.22     $  (0.24)
Diluted earnings per share                       $    0.19     $    0.25          --     $    0.21          --
Shares used in computing basic earnings (loss)
   per share                                         8,648         8,549        8,485        8,274        7,919
Shares used in computing diluted earnings per
   share                                             8,795         8,693          --         8,338          --
- - ------------------------------------------------------------------------------------------------------------------
Balance Sheet Data (a)
Total assets                                       $95,889       $93,075     $ 90,912     $ 78,636     $ 80,989
Working capital                                     28,307        32,583       34,601       36,313       32,582
Noncurrent obligations and deferred income
   taxes                                            11,584        14,177       16,799        1,700        1,348
Shareholders' equity                                59,137        58,100       55,812       65,306       63,059
- - ------------------------------------------------------------------------------------------------------------------
</TABLE>

(a)      The  Company  was  involved  in  several  acquisitions,   mergers,  and
         divestitures  during the five year period presented.  See Notes 5 and 8
         to the Company's consolidated financial statements.



                                       12
<PAGE>


Item 7.       Management's Discussion and Analysis of Financial Condition 
              and Results of Operations

Results of Operations

The following  table sets forth (i) certain items in the Company's  Consolidated
Statements of Operations as a percentage of net revenue and (ii) the  percentage
increase  (decrease)  in the  dollar  amount  of  those  items  for  the  period
indicated.  Net  revenue  is  determined  by  subtracting  the costs of  outside
subcontractor services,  largely drilling contractors and specialized consultant
services,  from gross revenue. Since EMCON's use of subcontractors can vary from
period to period  and the costs of these  services  are passed  directly  to the
Company's  clients,  the Company  believes  that net revenue is a more  accurate
measure of the value of its services.

<TABLE>
<CAPTION>

- - --------------------------------------------------------------------------------------------------------------------------
                                                          Percentage of                               Percentage
                                                           Net Revenue                            Increase (Decrease)
                                              ------------------------------------        --------------------------------
                                                                                                 1998             1997
                                                                                                  vs.              vs.
Years Ended December 31,                          1998         1997         1996                 1997             1996
- - --------------------------------------------------------------------------------------------------------------------------
<S>                                              <C>          <C>          <C>                  <C>              <C>   
Net revenue                                      100.0%       100.0%       100.0%               18.7%            (7.0%)
Direct expenses                                   59.1%        51.3%        44.7%               36.7%             6.7%
Indirect expenses                                 38.0%        45.5%        55.9%                0.1%           (24.4%)
Restructuring/other charges                        --          (0.5%)        7.0%              (99.3%)         (107.1%)
Loss on disposition of laboratory                  --           0.3%         2.8%                 --            (90.0%)
Gain on disposition of assets                      --          (1.0%)         --                  --               --
Income (loss) from operations                      2.9%         4.4%       (10.4%)             (21.0%)          139.6%
Interest income (expense), net                    (0.5%)       (0.7%)       (0.7%)              (6.7%)            7.5%
Equity in income(loss) of affiliates                --           --          0.2%             (650.0%)         (100.9%)
Minority interest expense                           --         (0.7%)       (0.2%)                --           (330.9%)
Income (loss) before provision (benefit)
   for income taxes                                2.4%         3.0%       (11.1%)              (5.3%)          125.5%
Provision (benefit) for income
  taxes                                            1.2%         1.0%        (2.5%)              29.9%           139.5%
Net income (loss)                                  1.2%         2.0%        (8.6%)             (24.3%)          121.4%
- - --------------------------------------------------------------------------------------------------------------------------
</TABLE>

Net Revenue: Net revenues for 1998 totaled $129,960,000,  an 18.7% increase from
$109,502,000  in 1997.  At the end of the first  quarter  of 1997,  the  Company
divested its laboratory  line of business,  CAS. CAS contributed net revenues of
$4,904,000  in 1997.  Excluding  net  revenue  contributed  by CAS in the  first
quarter of 1997, net revenue from continuing  operations in 1998 increased 24.3%
from  $104,598,000  in 1997.  The increase in net revenue was primarily due to a
57.6%  increase in net revenue  from EMCON's EOC  reportable  segment and a 2.6%
increase in net revenue from EMCON's PSD reportable  segment,  as the demand for
EMCON's services continued to increase.

Net revenue for 1997 decreased 7.0% from  $117,705,000 in 1996. The decrease was
due in part to the  divestiture  of CAS at the end of the first  quarter of 1997
(CAS  contributed net revenue of $4,904,000 in 1997 and $20,505,000 in 1996), as
well as lower  demand  for the  Company's  services  within  the  Company's  PSD
reportable segment. The decrease in net revenue was offset in part by the growth
of the  EOC  reportable  segment  from  net  revenues  of  $22,167,000  in  1996
(following the acquisition of OWT on February 29, 1996) to $41,386,000 in 1997.



                                       13
<PAGE>


Direct  Expenses:  Direct expenses  include  compensation for billable hours for
technical and professional staff and other project related expenses,  as well as
direct labor and  materials  for in-house  testing,  construction,  drilling and
operations/maintenance activities. Direct expenses for 1998 totaled $76,749,000,
a 36.7%  increase  compared  to direct  expenses  of  $56,134,000  during  1997.
Excluding the impact of CAS (which incurred direct expenses of $2,267,000 in the
first quarter of 1997),  direct  expenses  increased  42.5% from  $53,867,000 in
1997. As a percentage of net revenue,  direct expenses,  as reported,  increased
from  51.3% in 1997 to 59.1% in 1998.  The  increase  was due in large part to a
shift in business mix resulting  from the  divestiture  of CAS and the continued
expansion of the EOC reportable segment.

Direct  expenses for 1997 increased 6.7% over direct  expenses of $52,608,000 in
1996.  Direct  expenses as a percent of net revenue  increased  to 51.3% in 1997
from 44.7% in 1996.  The  increase  was due in large part to a shift in business
mix resulting from the divestiture of CAS and the continued expansion of the EOC
reportable segment combined with higher utilization of professional staff within
the PSD reportable segment.

Indirect   Expenses:   Indirect   expenses   include  salary   compensation  for
non-billable  hours of  professional,  technical  and  administrative  staff and
general  administrative  expenses such as rent,  bonuses,  benefits,  insurance,
legal,  depreciation  and  amortization.  Indirect  expenses  for  1998  totaled
$49,373,000; essentially flat as compared to indirect expenses of $49,782,000 in
1997.  Excluding  the  impact  of  CAS  (which  incurred  indirect  expenses  of
$2,529,000 in the first quarter of 1997) indirect expenses during 1998 increased
4.5% from  $47,253,000  during 1997.  As a percentage  of net revenue,  however,
indirect expenses,  as reported,  decreased from 45.5% in 1997 to 38.0% in 1998.
The  decrease  was due in part to the  above-noted  shift in business  mix,  the
expansion of the EOC  reportable  segment and the continued  positive  impact of
cost containment measures.

Indirect expenses for 1997 decreased 24.4% from indirect expenses of $65,844,000
in 1996.  Indirect  expenses as a percent of net revenue  decreased  to 45.5% in
1997 from 55.9% in 1996. The decrease was due in part to the  above-noted  shift
in business mix  following  the  divestiture  of CAS,  the  expansion of the EOC
reportable segment and the planned short-term  contraction of the PSD reportable
segment as it  refocused  its  service  offerings,  combined  with the effect of
significant severance costs and expenses related to the closure of several small
offices during 1996. In addition, during the fourth quarter of 1996, the Company
increased  reserves  relating  to pending  litigation  matters by an  additional
$1,553,000.  The increased litigation reserves proved adequate for resolution of
the matters contemplated.

Restructuring/Other  Charges:  In the fourth quarter of 1996,  senior management
reviewed the Company's operational and administrative  functions for the purpose
of further improving the Company's  competitiveness  and overall  profitability.
Based on this review,  the  Company's  Board of  Directors  approved a strategic
restructuring plan in December,  1996 to reposition the Company to fully exploit
its  core  strengths  in  engineering,  design,  construction,   operations  and
maintenance.  As a result  of these  actions,  in 1996  the  Company  recognized
pre-tax   restructuring   and  other  charges  of  $1,237,000  and   $6,960,000,
respectively. Included in the restructuring charge were $604,000 relating to the
closure or downsizing of several  underperforming  offices,  $628,000 related to
employee  severance  and  the  write-off  of  employment  contracts  for  former
employees no longer  actively  participating  in the  Company's  affairs,  and a
$5,000 adjustment to the 1994 restructuring plan. Included in other charges were
$4,768,000  related  to  the  write-down  in  the  carrying  value  of  goodwill
associated with the Company's  continuing operating units in accordance with the
Statement  of  Financial  Accounting  Standards  No.  121,  "Accounting  for the
Impairment of Long-Lived  Assets and for  Long-Lived  Assets to Be Disposed Of",
$1,529,000  related to the  write-off  of idle or disposed  of assets,  $368,000
related to the write-down of the Company's  landfill gas  production  rights and
related fixed assets,  and $156,000  related to the buyout and  cancellation  of
outstanding  stock  options  to  purchase  approximately  743,000  shares of the
Company's common stock held by employees of the Company. Also, included in other
charges were $139,000 for various other  operational  costs.  Net  reductions of
$4,000 and



                                       14
<PAGE>


$586,000 to the reserve were recorded in 1998 and 1997, respectively, to reflect
lower than  anticipated  costs  associated  with the  abandonment and subsequent
sublease of certain office space and lower than anticipated  severance costs due
to retaining certain previously identified personnel.

Loss on  Disposition of  Laboratory:  In December  1996, the Company  executed a
letter of intent to sell its laboratory  line of business,  Columbia  Analytical
Services,  Inc.  (CAS), to the employees of CAS by the first quarter of 1997. In
anticipation of the sale, the Company recognized an impairment in its investment
in CAS of  $3,327,000;  including a write-down in the carrying value of goodwill
associated with previous  laboratory  acquisitions  of $1,426,000.  For the year
ended December 31, 1996, CAS had a loss before taxes of $142,000.

During the first quarter of 1997,  the Company  completed the sale of CAS to the
employees of CAS for $4,000,000 in cash,  CAS'  promissory  notes for $3,219,000
("CAS  Notes")  and a  continuing  preferred  stock  interest  in CAS  valued at
$500,000.  The  Company  paid  $206,000  in  cash to CAS  for  retired  employee
contracts  and for  accelerated  vesting of stock  options and other  non-vested
stock rights. As a result of several closing adjustments, the Company recognized
an  additional  loss  on  disposition  of CAS in the  first  quarter  of 1997 of
$333,000.  CAS and the Company  also  entered  into a Master  Service  Agreement
(subsequently  amended  April,  1998)  relating to the  continued  provision  of
laboratory  services to the Company  (the  "MSA").  The CAS Notes are subject to
offset,  in certain  circumstances,  based upon the levels of future revenues to
CAS accruing  under the amended MSA. The Company  currently  does not anticipate
that any offset will occur under the terms of the amended MSA.

Gain on Sale of Assets:  During the first quarter of 1997, the Company completed
the sale of one of its landfill  gas-to-energy  projects,  including the related
leasehold production rights and associated machinery and equipment.  The Company
recognized a gain on disposition of the project in 1997 of $1,026,000.

Interest  Income:  The  Company  recorded  interest  income of  $548,000 in 1998
compared  to $516,000 in 1997 and  $317,000  in 1996.  The  increase in interest
income in 1998 and 1997 compared to 1996 was primarily due to the recognition of
interest income on the CAS Notes.

Interest  Expense:  The Company incurred  interest expense of $1,234,000 in 1998
compared  to  $1,251,000  in 1997.  The  decrease  in  interest  expense was due
primarily to a decrease in debt.

The Company  incurred  interest  expense of $1,112,000 in 1996.  The increase in
interest  expense in 1997  compared to 1996 was due  primarily to an increase in
debt in connection with (i) the acquisition of National Earth Products, Inc. and
(ii) the  acquisition  and  expansion of the EOC reporting  segment's  equipment
fabrication  facility.  This was offset by the $3,000,000  prepayment on the OWT
secured term loan.

Income Taxes Provision  (Benefit):  The provision  (benefit) for income taxes in
1998 was $1,508,000 compared to $1,161,000 in 1997 and ($2,936,000) in 1996. The
effective tax rate for 1998 was 48.0% versus 35.0% in 1997 and (22.5%) for 1996.
The increase in the 1998  effective  tax rate compared to 1997 was primarily due
to the  reduction  in  alternative  fuel tax  credits  generated  by the Company
following the sale of one of EMCON's landfill gas-to-energy projects in 1997 and
the increase in the level of  non-deductible  goodwill.  The 1996 tax benefit is
primarily  due to  the  alternative  minimum  tax  credits  generated  from  the
Company's landfill  gas-to-energy  project and from temporary timing differences
consisting of the restructuring charges,  impairment of assets held for sale and
the increase in the legal reserve.



                                       15
<PAGE>


Included in the Company's  consolidated  balance sheet at December 31, 1998, are
total  current and  long-term  net deferred tax assets of  $4,466,000.  The full
utilization of such assets is dependent  upon a number of factors  including the
Company's  ability to generate future profits and the  anticipated  reduction in
the level of new tax credits  generated  from the  Company's  existing  landfill
gas-to-energy  project.  Based on these factors, the Company believes that it is
more likely than not that the full  benefit of the net  deferred tax assets will
be realized by the Company in due course.

Liquidity and Capital Resources

Working Capital: Cash provided by operating activities for fiscal 1998, 1997 and
1996 was $4,741,000,  $6,189,000, and $1,583,000,  respectively.  The changes in
cash  provided by operating  activities  in 1998,  1997 and 1996 were  primarily
attributed to changes in the Company's net income (loss),  accounts  receivable,
accounts  payable,  depreciation  and  amortization,  bad debt expense,  gain on
disposition  of assets,  prepaid  expense and other current tax assets and other
accrued  liabilities.  During 1998, the Company's uses of cash for non-operating
activities primarily consisted of repayment of debt in the amount of $2,430,000,
repurchase  of 408,000  shares of common stock in the amount of  $1,247,000  and
$4,094,000 in additions to property and equipment.

In  conjunction  with  the  acquisition  of  OWT,  the  Company  entered  into a
$20,000,000   secured  credit  agreement  with  its  existing  commercial  bank,
replacing  its  previous  $10,000,000  unsecured  line of credit.  Under the new
agreement,  the Company borrowed  $10,000,000 on a term loan basis with interest
at a managed  rate not to exceed the prime rate.  Principal  is to be  amortized
over seven years, but with any unpaid amount finally due and payable on June 30,
2001.  The line of credit  component of the Credit  Agreement  is available  for
working capital  purposes.  The line of credit component of the Credit Agreement
has been extended to April 30, 1999 at a level of $5,000,000  pending completion
of negotiations of a long-term  facility.  The Company expects to renew the line
of credit  component of the Credit  Agreement at the $10,000,000  level prior to
its expiration.  The Credit  Agreement  contains  provisions with respect to the
payment of  dividends  and the level of capital  expenditures  and  requires the
maintenance  of  specific  levels of  working  capital,  tangible  net worth and
continued quarterly profitability. In April 1997, following the infusion of cash
upon the  divestiture  of CAS, the Company  prepaid,  on an  accelerated  basis,
$3,000,000  of the then  outstanding  principal  balance  of the  secured  loan.
Amounts outstanding as of December 31, 1998, were $3,429,000 and $0 for the term
loan and line of credit, respectively.

Capital  Expenditures:  The Company invested  $4,094,000 in 1998 in additions to
property and equipment, mainly computers, field equipment and development of the
Company's leachate evaporation system (LES) projects.  The Company believes that
its cash on hand and cash generated from operations, together with its available
bank  financing  will be sufficient  to meet the Company's  capital needs for at
least the next twelve months.

In  1998,   the  Company   announced  a  plan  to   repurchase,   under  certain
circumstances,  up to 1,000,000 shares of its common stock. In 1998, the Company
repurchased  407,700  shares  under the  program for a total  purchase  price of
$1,247,000.

Year 2000

Impact  of Year  2000:  The year 2000  (Y2K)  issue is the  result  of  computer
programs  being written  using two digits rather than four to define  applicable
years. Any of the Company's computer programs that have time-sensitive  software
may recognize a date using "00" as the year 1900 rather than the year 2000. This
could  result in a system  failure or  miscalculations  causing  disruptions  of
operations,  including,  among other  things,  a temporary  inability to process
transactions, send invoices, or engage in similar normal business activities.



                                       16
<PAGE>


The Company's  State of  Readiness:  The Company is in the process of completing
its internal analysis of potential Y2K compliance  issues.  Internal surveys are
being completed to identify  potential  hardware and software concerns and other
potential  non-IT  systems that may be affected.  During 1998, the Company began
testing its internal  systems for Y2K compliance and anticipates  completing the
testing  phase in the first  quarter of 1999.  The  Company  has begun to review
third party vendor/suppliers and customers that management believes could have a
material  effect  to its  business,  to  ascertain  if and when they will be Y2K
compliant.  Survey letters to these third parties will be  distributed  early in
the first quarter of 1999. Information supplied by third parties will be entered
into a database  and  reviewed  by the  Company's  IT  department  and  business
managers to determine  whether there are any potential  issues.  Once issues are
identified  (anticipated  to  occur  in the  second  quarter  of  1999),  senior
management will determine their potential  impact to the Company's  business and
develop action plans accordingly.

The Cost to Address the  Company's  Year 2000 Issues:  Budgets for the Company's
internal computer, network, phone and related system needs were completed in the
fourth quarter of 1998. It is anticipated  that the costs to bring these systems
into  Y2K  compliance  is  approximately  $1,850,000;  consisting  primarily  of
software  updates,  computer  replacements,  telephone  system changes and other
costs, including disposition of assets, and outside consulting.  The majority of
these  costs are being  incurred in the  ordinary  course of business as part of
EMCON's normal replacement/upgrade program for it's computer, network, telephone
and related systems. It is expected that 40%, 35%, 20% and 5% of the total costs
will  be  incurred  in  first,  second,  third  and  fourth  quarters  of  1999,
respectively. Approximately $1,000,000 of the $1,850,000 estimated costs will be
financed through  multi-year  operating leases. The costs of the project and the
dates on which the Company believes it will complete the Y2K  modifications  are
based on management's  best  estimates,  which were derived  utilizing  numerous
assumptions of future events.

The Company  believes it will be able to test and remedy the majority of any Y2K
issues utilizing its existing IT staff with minimal use of outside consultants.

The Risks of the Company's Year 2000 Issues: The Company does not expect the Y2K
project to have a significant  effect on  operations.  At this time, the Company
believes  that any internal  Y2K issues can be resolved  prior to the year 2000.
The potential impact of Y2K issues on the Company's two reporting segments,  the
PSD and EOC is expected to be somewhat different.  PSD, a consulting  operation,
has less exposure due to the  professional  services  nature of its business.  A
portion of EOC's revenues,  however,  involve the use of sophisticated equipment
which at this time,  based on initial  testing,  the Company  believes to be Y2K
compliant.  To  date,  the  Company  has not  received  from  its  vendors,  any
indication that the Company would not be able to receive necessary  supplies for
its construction or fabrication processes.

The Company's  Contingency  Plans: The Company has not established a contingency
plan to address  unexpected  failures due to Y2K problems.  Internal  testing of
systems should be substantially finished prior to April, 1999. The Company plans
to evaluate the status of its internal  testing and the information  supplied by
its vendors and  customers in June,  1999 and  determine  whether such a plan is
necessary.



                                       17
<PAGE>


Item 8.       Financial Statements and Supplementary Data

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
                                                                        Page
                                                                    ------------
Consolidated Statements of Operations for each 
  of the three years ended December 31, 1998,
  1997, and 1996................................................         19

Consolidated Balance Sheets as of December 31, 1998 and 1997....         20

Consolidated Statements of Shareholders' Equity for each of the 
  three years ended December 31, 1998, 1997, and 1996...........         21

Consolidated Statements of Cash Flows for each of the three 
  years ended December 31, 1998, 1997, and 1996.................         22

Notes to Consolidated Financial
  Statements....................................................         23

Report of Ernst & Young LLP, Independent Auditors...............         42




                                       18
<PAGE>


EMCON
CONSOLIDATED STATEMENTS OF OPERATIONS
<TABLE>
<CAPTION>
- - ------------------------------------------------------------------------------------------------------------------------
                                                                                   Years Ended December 31,
                                                                        ------------------------------------------------
(In thousands, except per share amounts)                                     1998            1997             1996
- - ------------------------------------------------------------------------------------------------------------------------
<S>                                                                         <C>             <C>              <C>    

Gross revenue                                                               $151,348        $139,343         $137,626
Outside services at cost                                                      21,388          29,841           19,921
                                                                            --------        --------         --------

         Net revenue                                                         129,960         109,502          117,705

Costs and expenses:
     Direct expenses                                                          76,749          56,134           52,608
     Indirect expenses                                                        49,373          49,782           65,844
     Restructuring/other charges                                                  (4)           (586)           8,197
     Loss on disposition of laboratory                                            --             333            3,327
     Gain on sale of assets                                                       --          (1,026)              --
                                                                            --------        --------         --------

         Income (loss) from operations                                         3,842           4,865          (12,271)

Interest income                                                                  548             516              317
Interest expense                                                              (1,234)         (1,251)          (1,112)
Equity in income (loss) of affiliates                                            (15)             (2)             227
Minority interest expense                                                         --            (810)            (188)
                                                                            --------        --------         --------

Income (loss) before provision (benefit) for
   income taxes                                                                3,141           3,318          (13,027)
Provision (benefit) for income taxes                                           1,508           1,161           (2,936)
                                                                            --------        --------         --------

Net income (loss)                                                          $   1,633       $   2,157         $(10,091)
                                                                           =========       =========         ========

Basic earnings (loss) per share                                            $    0.19       $    0.25         $  (1.19)
                                                                           =========       =========         ========

Diluted earnings per share                                                 $    0.19       $    0.25               --   
                                                                           =========       =========         ========

Shares used in computing basic earnings (loss) per share                       8,648           8,549            8,485
                                                                           =========       =========         ========

Shares used in computing diluted earnings per share                            8,795           8,693               --
                                                                           ==========      =========         ========
                                                                                                                 

  See accompanying notes.
</TABLE>



                                       19
<PAGE>

<TABLE>
<CAPTION>

EMCON
CONSOLIDATED BALANCE SHEETS
- - ------------------------------------------------------------------------------------------------------------------------
                                                                                                    December 31,
                                                                                              --------------------------
(In thousands, except share amounts)                                                              1998         1997
- - ------------------------------------------------------------------------------------------------------------------------
<S>                                                                                            <C>           <C>
ASSETS
Current Assets:
Cash and cash equivalents                                                                      $  2,677      $  6,106
Accounts Receivable:
    Billed accounts receivable, net of allowance for doubtful accounts
      of $737 and $634 at December 31, 1998 and 1997, respectively                               32,683        31,413
    Unbilled accounts receivable, net of allowance for doubtful accounts
      of $801 and $295 at December 31, 1998 and 1997, respectively                                6,664         5,310
Costs and estimated earnings in excess of billings on
    uncompleted contracts                                                                         2,511           678
Prepaid expenses and other current assets                                                         2,876         3,401
Inventory                                                                                         2,630         2,238
Deferred taxes, current portion                                                                   3,434         4,235
                                                                                                -------       -------
    Total Current Assets                                                                         53,475        53,381
Net property and equipment, at cost                                                              16,519        16,182
Notes receivable                                                                                  2,724         2,811
Cash surrender value of insurance policies                                                        3,466         2,346
Other assets                                                                                      2,971         2,597
Deferred tax assets                                                                               1,032         1,028
Goodwill, net of amortization                                                                    14,850        13,916
Other intangible assets, net of amortization                                                        852           814
                                                                                                -------       -------
    Total Assets                                                                                $95,889       $93,075
                                                                                                =======       =======
LIABILITIES AND SHAREHOLDERS' EQUITY
Current Liabilities:
Accounts payable                                                                                $10,711       $ 8,391
Accrued payroll and related benefits                                                              5,335         4,356
Other accrued liabilities                                                                         4,347         2,969
Billings in excess of costs and estimated earnings
    on uncompleted contracts                                                                      2,598         2,732
Long-term obligations due within one year                                                         2,177         2,350
                                                                                                -------       -------
    Total Current Liabilities                                                                    25,168        20,798
Long-term debt                                                                                    9,400        11,441
Other noncurrent obligations                                                                     2,184         2,736
Commitments and contingencies                                                                        --            --
Shareholders' Equity:
Preferred stock, no par value, 5,000,000 shares authorized;
    no shares issued or outstanding                                                                  --            --
Common stock, no par value, 15,000,000 shares authorized;
    8,315,399 and 8,571,764 shares issued and outstanding at
    December 31, 1998 and 1997, respectively                                                     41,628        42,184
Retained earnings                                                                                17,509        15,916
                                                                                                -------       -------
    Total Shareholders' Equity                                                                   59,137        58,100
                                                                                                -------       -------
    Total Liabilities and Shareholders' Equity                                                  $95,889       $93,075
                                                                                                =======       =======
   See accompanying notes.
</TABLE>



                                       20
<PAGE>

EMCON
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
<TABLE>
<CAPTION>

- - ----------------------------------------------------------------------------------------------------------------------------
                                                                                             Unrealized
                                                                                             Gain (Loss)
                                                                                                 on             Total
                                                         Common Stock          Retained      Marketable     Shareholders'
(In thousands)                                        Shares      Amount       Earnings      Securities         Equity
- - ----------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>       <C>           <C>            <C>             <C>
Balance at December 31, 1995                            8,329     $41,401       $23,918        $ (13)          $65,306
Issuance of common stock upon exercise of options,
  net of redemptions                                        5          15            --           --                15
Issuance of common stock under the Employee Stock
  Purchase Plan                                            88         258            --           --               258
Issuance of restricted stock, net of cancellation          91         327            --           --               327
Net change in unrealized losses on marketable
  securities                                               --          --            --           13                13
Dividends paid                                             --          --           (16)          --               (16)
Net loss                                                   --          --       (10,091)          --           (10,091)
                                                     -----------------------------------------------------------------------

Balance at December 31, 1996                            8,513      42,001        13,811            0            55,812
Issuance of common stock upon exercise of options,
  net of redemptions                                       42         151            --           --               151
Issuance of common stock under the Employee Stock
  Purchase Plan                                            36          99            --           --                99
Cancellation of restricted stock                          (19)        (67)           --           --               (67)
Dividends paid                                             --          --           (52)          --               (52)
Net income                                                 --          --         2,157           --             2,157
                                                     -----------------------------------------------------------------------

Balance at December 31, 1997                            8,572      42,184        15,916           --            58,100
Issuance of common stock upon exercise of options,
  net of redemptions                                       29         104            --           --               104
Issuance of common stock for the purchase of
  Advanced Analytical Solutions (A2S)                     123         593            --           --               593
Cancellation of restricted stock                           (1)         (6)           --           --                (6)
Dividends paid                                             --          --           (40)          --               (40)
Repurchase of common stock                               (408)     (1,247)           --           --            (1,247)
Net income                                                 --          --         1,633           --             1,633
                                                     -----------------------------------------------------------------------

Balance at December 31, 1998                            8,315     $41,628       $17,509           $0           $59,137
                                                     -----------------------------------------------------------------------
</TABLE>
See accompanying notes.




                                       21
<PAGE>

<TABLE>
<CAPTION>

EMCON
CONSOLIDATED STATEMENTS OF CASH FLOWS
- - ---------------------------------------------------------------------------------------------------------------------------
                                                                                            Years Ended December 31,

Increase (decrease) in cash and cash equivalents (in thousands)                         1998          1997           1996
- - ---------------------------------------------------------------------------------------------------------------------------
<S>                                                                                  <C>           <C>            <C>
Cash flow from operating activities:
Net income (loss)                                                                    $ 1,633       $ 2,157        $(10,091)
Adjustments to reconcile net income (loss) to net cash
provided by operating activities:
   Depreciation                                                                        3,781         3,808           7,330
   Amortization                                                                          663           652           1,034
   Bad debt expense                                                                      755         1,424             717
   (Gain) loss on sale/disposal of property and equipment                               (279)          227             474
   Loss on disposition of laboratory                                                      --           333              --
   Gain on disposition of assets                                                          --        (1,026)             --
   Write-down of gas production rights                                                    --            --             247
   Impairment of goodwill                                                                 --            --           6,194
   Increase (decrease) in salary continuation plan                                      (203)          102             133
   Changes in operating assets and liabilities:
       Accounts receivable                                                            (2,957)       (3,971)            509
       Costs in excess of billings                                                    (1,833)          226            (421)
       Inventory                                                                        (392)       (1,359)           (102)
       Prepaid expenses and other assets                                                 847        (1,015)           (782)
       Notes receivable                                                                   87        (2,211)           (257)
       Cash surrender value, insurance policies                                       (1,120)         (639)           (381)
       Other assets                                                                     (369)        2,425          (1,238)
       Deferred tax assets                                                               797         1,193          (3,616)
       Accounts payable                                                                1,862         2,912            (351)
       Accrued payroll and related benefits                                              940          (562)            661
       Billings in excess of costs                                                      (134)        2,638            (217)
       Other accrued liabilities                                                         663        (1,125)          1,740
- - ---------------------------------------------------------------------------------------------------------------------------

          Net cash provided by operating activities                                    4,741         6,189           1,583
- - ---------------------------------------------------------------------------------------------------------------------------
Cash flow from investing activities:
   Additions to property and equipment                                                (4,094)       (5,325)         (2,484)
   Maturities of available for sale securities                                            --            --             514
   Net cash on disposition of laboratory                                                  --         3,794              --
   Net cash from dispositions of assets                                                   --         1,040              --
   Cash portion of assets held for sale                                                   --            --            (593)
   Acquisitions, net of cash acquired                                                   (827)         (858)        (13,827)
   Additional investment in intangible assets                                           (102)           --              --
   Proceeds from sale of property and equipment                                          414           203             508
- - ---------------------------------------------------------------------------------------------------------------------------

          Net cash used for investing activities                                      (4,609)       (1,146)        (15,882)
- - ---------------------------------------------------------------------------------------------------------------------------
Cash flow from financing activities:
   Proceeds of new debt obligation                                                        58         1,314          17,526
   Payments of current and noncurrent obligations                                     (2,430)       (5,731)         (7,931)
   Issuance of common stock for cash, net of cancellations                                98           201             600
   Repurchase of common stock                                                         (1,247)           --              --
   Dividend payments                                                                     (40)          (52)            (16)
- - ---------------------------------------------------------------------------------------------------------------------------

          Net cash provided by (used for) financing activities                        (3,561)       (4,268)         10,179
- - ---------------------------------------------------------------------------------------------------------------------------
Increase (decrease) in cash and cash equivalents                                      (3,429)          775          (4,120)
Cash and cash equivalents, beginning of year                                           6,106         5,331           9,451
- - ---------------------------------------------------------------------------------------------------------------------------
Cash and cash equivalents, end of year                                               $ 2,677       $ 6,106         $ 5,331
- - ---------------------------------------------------------------------------------------------------------------------------
</TABLE>
See accompanying notes.




                                       22
<PAGE>


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.   Organization and Summary of Significant Accounting Policies

Basis  of  Presentation:  The  accompanying  consolidated  financial  statements
include the  accounts of the Company  and its wholly  owned  subsidiaries  after
elimination of all significant  intercompany accounts and transactions.  Certain
amounts in the 1996 financial  statements  have been  reclassified to conform to
the 1997 and 1998 presentations.

In 1994,  the Company  converted  to a  fifty-two/fifty-three  week fiscal year,
resulting  in a fifty-two  week year in 1998 and 1997.  The  Company's  year end
falls on the Friday closest to the last day of the calendar quarter. The Company
also follows a five-four-four week quarterly cycle. While the actual period ends
for the  fiscal  years 1998 and 1997 were  January 1, 1999 and  January 2, 1998,
respectively,  for  convenience,  the date  shown on  accompanying  consolidated
financial statements is December 31, the last day of the calendar periods.

Use of Estimates in the Preparation of Financial Statements:  The preparation of
consolidated  financial  statements,   in  conformity  with  generally  accepted
accounting  principles,  requires  management to make estimates and  assumptions
that affect the reported  amounts of assets and  liabilities  and  disclosure of
contingent  assets and  liabilities at the date of the financial  statements and
the reported amounts of revenue and expenses during the reporting period. Actual
results could differ from those estimates.

Revenue Recognition and Expenses:  Revenue from engineering service contracts is
recognized  as services  are  provided,  revenue from  construction  projects is
recognized  on a percentage  of  completion  basis and revenue from  maintenance
contracts is recognized on a straight-line  basis over the life of the contract.
The Company  routinely  subcontracts for outside  services,  such as specialized
laboratory  services.  These costs are generally passed through to the Company's
customers.  The Company  believes net revenue is a more accurate  measure of the
value of its services than gross revenue.  Direct costs include compensation for
billable hours for  professional  and technical staff and other project expenses
reimbursed by clients.  Indirect  costs include  compensation  for  non-billable
professional and technical staff hours, all employee fringe benefits, marketing,
and general and administrative  expenses such as rent,  insurance,  depreciation
and amortization.

Cash and Cash Equivalents and Marketable  Securities:  The Company considers all
investment  instruments and marketable securities with an original maturity date
of 90 days or less at the date of  purchase to be cash  equivalents.  Management
determines  the   appropriate   classifications   of  debt  securities  held  as
investments  as either  held-to-maturity  or  available-for-sale  at the time of
purchase and reevaluates such designation as of each consolidated  balance sheet
date.  Investments  consisting  primarily  of high  grade  U.S.  government  and
corporate marketable debt securities are classified as  available-for-sale,  and
are carried at fair value,  based on quoted market  prices,  with the unrealized
gains and losses,  net of tax, reported in a separate  component of consolidated
shareholders'  equity.  The cost of debt securities is adjusted for amortization
of  premiums  and  accretion  of  discounts  to  maturity,  which is included in
interest  income.  Realized  gains and losses and declines in value judged to be
other-than-temporary,  as well as any interest on these securities, are included
in  interest  income.  The cost of  securities  sold is  based  on the  specific
identification  method.  There were no debt  securities held as investment as of
December 31, 1998 or 1997.

Supplemental Cash Flow Information: Cash paid for income taxes was approximately
$926,000,  $1,673,000 and $659,000 for the years ended  December 31, 1998,  1997
and 1996,  respectively.  Cash paid for interest was  approximately  $1,026,000,
$1,210,000  and $951,000 for the years ended  December 31, 1998,  1997 and 1996,
respectively.



                                       23
<PAGE>


In 1995,  the Company sold certain land and buildings in exchange for $1,100,000
in marketable trade credits which will be used to reduce cash payments of future
recurring  corporate  expenses.  No significant gain or loss was incurred on the
transaction.  The trade  credits  expire in 2003,  and the  Company  expects  to
utilize such credits prior to expiration. To date, $506,000 of the trade credits
have been applied to payments. The Company has agreements for the utilization of
an additional $175,000 of the trade credits and are included on the December 31,
1998  consolidated  balance  sheet in other current  assets.  As of December 31,
1998, the remaining balance of $419,000 is included in other assets.

Inventories:  Inventories  are recorded at the lower of cost using the first-in,
first-out method, or market.

<TABLE>
<CAPTION>

Property and Equipment:  Property and equipment consists of (in thousands):
- - -------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                                      1998             1997
- - -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                         <C>              <C>     
Land and buildings                                                                          $  4,688         $  4,683
Machinery and equipment                                                                       22,995           19,895
Furniture and fixtures                                                                         3,661            3,685
Vehicles                                                                                       2,253            2,362
Leasehold improvements                                                                         1,293            1,074
- - -------------------------------------------------------------------------------------------------------------------------
     Total                                                                                    34,890           31,699
Less accumulated depreciation and amortization                                                18,371           15,517
- - -------------------------------------------------------------------------------------------------------------------------
Net property and equipment                                                                   $16,519          $16,182
- - -------------------------------------------------------------------------------------------------------------------------
</TABLE>

Property and equipment are stated at cost.  Depreciation  and  amortization  are
provided  on the  straight-line  basis over the lesser of the  estimated  useful
lives of the  assets or the term of the lease  (lives  range  from 2-31  years).
Amortization of property and equipment acquired under capital leases is included
with  depreciation  expense.  Approximately  $1,187,000  and $3,963,000 of fixed
assets,   net  of  accumulated   depreciation   of  $1,052,000  and  $3,533,000,
respectively, were sold or disposed of in 1998 and 1997, respectively.

Basic and Diluted Net Income (Loss) per Share: In 1997, the Financial Accounting
Standards  Board issued  Statement  No. 128,  Earnings per Share.  Statement 128
replaced the  calculation  of primary and fully diluted  earnings per share with
basic and diluted earnings per share.  Unlike primary earnings per share,  basic
earnings  per share  excludes  any  dilutive  effects of options,  warrants  and
convertible  securities.  Diluted  earnings  per share is very  similar to fully
diluted  earnings per share as previously  computed  under APB 15. Income (loss)
per share amounts for all periods have been  presented,  and where  appropriate,
the  presentation  has  been  restated  to  conform  to the  requirements  under
Statement 128.

Adoption of Statement 131:  Effective  January 1, 1998, the Company  adopted the
Financial   Accounting  Standards  Board's  Statement  of  Financial  Accounting
standards  No.  131,  Disclosure  about  Segments of an  Enterprise  and Related
Information,  ("Statement  131").  Statement 131  superseded  FASB Statement 14,
Financial  Reporting  for  Segments  of a  Business  Enterprise.  Statement  131
establishes  standards  for the way  that  public  business  enterprises  report
information about operating segments in annual financial statements and requires
that those enterprises  report selected  information about operating segments in
interim  financial  reports.  The  adoption  of  Statement  131 did  not  affect
consolidated  results of  operations or financial  position,  but did affect the
disclosure of segment information. See Note 2.

Business  Segment and  Concentration of Credit Risk: The Company operates within
two reportable segments,  the Operations and Construction Division (EOC) and the
Professional Services Division (PSD), which provides comprehensive environmental
engineering, consulting, construction facilities operations and



                                       24
<PAGE>


maintenance,  and services to  industrial,  private and  governmental  concerns,
predominantly  in the waste  disposal,  petroleum,  wood products,  chemical and
manufacturing  industries;  as well as to utilities,  non-regulatory  government
entities,  financial  institutions  and real  estate  developers.  There  are no
significant  operations or revenues  generated from non United States locations.
Ongoing credit evaluations of its customers'  financial  condition are performed
by the Company, generally requiring no collateral.

In  1998,  one  customer,  Waste  Management,  accounted  for  12%  and  11%  of
consolidated  gross and net  revenues,  respectively.  On a  reportable  segment
basis, the customer  represented  approximately 21% and 5% of the gross revenues
of the EOC and PSD reportable segments, respectively.

In 1997, one customer, Commonwealth Environmental Systems, accounted for 10% and
1% of consolidated gross and net revenues,  respectively. All of the revenue was
recorded by the EOC reportable segment and represented  approximately 27% and 3%
of EOC's gross and net revenues, respectively.

In 1996, no customer accounted for more than 10% of consolidated gross revenue.

Recent  Accounting  Pronouncements:  In  June  1997,  the  Financial  Accounting
Standards Board ("FASB") issued Statement of Financial  Accounting Standards No.
130, Reporting Comprehensive Income ("SFAS 130"). SFAS 130 establishes standards
for the reporting and display of comprehensive  income and its components in the
financial  statements.  Comprehensive  income is comprised of net income (loss),
changes  in the value of  available-for-sale  securities  and  foreign  currency
translation  adjustments,  and other such items  disclosed  in the  statement of
stockholders' equity. The Company adopted SFAS 130 in the first quarter of 1998,
with no effect on its consolidated financial statements.

Fair Value of Financial Instruments:  The following methods and assumptions were
used by the  Company in  estimating  its fair  value  disclosure  for  financial
instruments:

         Cash  and  cash  equivalents:  The  carrying  amount  reported  in  the
         consolidated  balance sheet for cash and cash equivalents  approximates
         its fair value.

         Notes  receivable:  The carrying  amount  reported in the  consolidated
         balance sheet for notes receivable approximates its fair value.

         Short  and  long-term  debt:  The  carrying  amounts  reported  in  the
         consolidated  balance sheet for short and long-term  debt  approximates
         their fair value because the interest rates are either market  variable
         rates or fixed rates that approximate market rates.

2.   Segment Reporting

Description of the types of services from which each reportable  segment derives
its revenues:  The Company  provides  comprehensive  environmental  engineering,
design,  construction,  operations and  maintenance,  and equipment  fabrication
services to a variety of public and private  industrial and solid waste clients.
The  Company is  comprised  of two  reportable  segments -- the  Operations  and
Construction  Division (EOC) and the Professional Services Division (PSD) -- and
services three key service lines:  Solid Waste,  Site  Restoration  and Facility
Services.

In 1996 and the first  quarter  of 1997,  the  Company  had,  as part of its PSD
reportable  segment,  a  laboratory   operation  known  as  Columbia  Analytical
Services,  Inc. (CAS).  During the first quarter of 1997, the Company  completed
the sale of CAS.



                                       25
<PAGE>


Measurement of segment profit or loss and segment assets:  The Company evaluates
performance of its reportable  segments,  EOC and PSD, based on operating income
or loss before and after  corporate  overhead  allocations,  but before interest
income,  interest expense,  equity in income of affiliates and minority interest
income (loss).  Corporate  overhead expenses are substantially  allocated to the
reporting  segments  based  on  revenue  and/or  headcount  when  an item is not
specifically  identified to a reporting segment.  The accounting policies of the
reportable  segments  are  the  same  as  those  described  in  the  summary  of
significant accounting policies in Note 1.

Intersegment  sales consist  primarily of labor and are marked up to provide the
supplying  reportable  segment a measure of  profit.  The  receiving  reportable
segment records the transfer as an "Outside  Service" and may or may not further
mark up the labor cost prior to passing the cost through to its customer. If the
cost is not passed  through to the customer,  the receiving  reportable  segment
records the  transaction  as an indirect  cost.  All  intersegment  accounts are
eliminated in consolidation.

Factors management used to identify the enterprise's  reportable  segments:  The
Company's   reportable  segments  are  divisional  units  that  offer  different
services.  The  reportable  segments  are  each  managed  separately.   The  PSD
reportable  segment  concentrates  on  professional   engineering,   design  and
consulting  services in solid waste,  site restoration and facilities  services.
The PSD reportable  segment has regional  operations  situated in the Northeast,
Southeast,  Northwest and Southwest portions of the United States, each overseen
by an Area Operations Manager. These regional operations have the same operating
parameters (services offered and required operating margins), may serve the same
national customers, and often share personnel. For reportable segment reporting,
these  regional  PSD  operations  are  aggregated.  The EOC  reportable  segment
concentrates on construction, drilling, equipment fabrication and operations and
maintenance services, primarily to the Company's solid waste clients.




                                       26
<PAGE>

<TABLE>
<CAPTION>

Segment Information

- - --------------------------------------------------------------------------------------------------------------------------------

                                                                PSD                                EOC       Other        Total
                                                ------------------------------------

Year ended December 31, 1998                     Consulting         Lab       Total
- - --------------------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>            <C>      <C>                <C>             <C>     <C>
Gross revenues from:
     External customers                             $86,366         N/A     $86,366            $64,982          --     $151,348
     Intersegment revenues                            3,187         N/A       3,187              3,597          --        6,784
Outside services from:
     External subcontractors                         20,979         N/A      20,979                409          --       21,388
     Intersegment services                            3,852         N/A       3,852              2,937          --        6,789
Net revenues                                         64,722         N/A      64,722             65,233           5      129,960
Depreciation expense                                  2,120         N/A       2,120              1,406         255        3,781
Amortization expense                                     --         N/A          --                 64         599          663
Segment operating profit before allocations           4,483         N/A       4,483              5,018          --        9,501
Segment operating profit after allocations              595         N/A         595              3,007         240        3,842
    Accounts receivable, net(1)                      27,607         N/A      27,607             11,740          --       39,347
- - --------------------------------------------------------------------------------------------------------------------------------

Year ended December 31, 1997
- - --------------------------------------------------------------------------------------------------------------------------------
Gross revenues from:
     External customers                             $81,738      $4,453     $86,191            $52,883       $ 269     $139,343
     Intersegment revenues                            1,513         734       2,247              2,375          --        4,622
Outside services from:
     External subcontractors                         16,813         275      17,088             12,754         (1)       29,841
     Intersegment services                            3,385           8       3,393              1,118          --        4,511
Net revenues                                         63,053       4,904      67,957             41,386         159      109,502
Depreciation expense                                  2,285         462       2,747              1,207         316        4,270
Amortization expense                                     --          --          --                101         551          652
Restructuring/other charges                              --          --          --                 --       (586)        (586)
Loss on disposition of laboratory                        --          --          --                 --         333          333
Gain on sale of assets                                   --          --          --                 --     (1,026)      (1,026)
Segment operating profit before allocations           4,923         108       5,031              4,982          --       10,013
Segment operating profit (loss) after
allocations                                           1,294        (59)       1,235              3,067         563        4,865
    Accounts receivable, net(1)                      23,164         N/A      23,164             13,559          --       36,723
- - --------------------------------------------------------------------------------------------------------------------------------

Year ended December 31, 1996
- - --------------------------------------------------------------------------------------------------------------------------------
Gross revenues from:
     External customers                             $94,836     $17,305    $112,141            $25,191        $294     $137,626
     Intersegment revenues                              536       4,013       4,549                528          --        5,077
Outside services from:
     External subcontractors                         15,794         806      16,600              3,321          --       19,921
     Intersegment services                            4,820           8       4,828                231          --        5,059
Net revenues                                         74,758      20,505      95,263             22,167         275      117,705
Depreciation expense                                  3,841       2,297       6,138              1,172          20        7,330
Amortization expense                                     --          --          --                 --       1,034        1,034
Restructuring/other charges                              --          --          --                 --       8,197        8,197
Loss on disposition of laboratory                        --          --          --                 --       3,327        3,327
Segment operating profit before allocations           2,891         754       3,645              2,493          --        6,138
Segment operating profit (loss) after
allocations                                            (815)       (455)     (1,270)               510     (11,511)     (12,271)
    Accounts receivable, net(1)                      26,704          --      26,704              6,156          --       32,860
- - --------------------------------------------------------------------------------------------------------------------------------
(1) The Company reviews its consolidated balance sheet and reviews only accounts
    receivable on a segment basis.
</TABLE>


                                       27
<PAGE>

<TABLE>
<CAPTION>

- - ----------------------------------------------------------------------------------------------------------------------

                                                                                Years ended December 31,
- - ----------------------------------------------------------------------------------------------------------------------

                                                                              1998            1997             1996
- - ----------------------------------------------------------------------------------------------------------------------
<S>                                                                         <C>             <C>              <C>
Revenues
Total external revenues for reportable segments                             $151,348        $139,343         $137,626
Intersegment revenues for reportable segments                                  6,784           4,622            5,077
Elimination of intersegment revenues                                          (6,784)         (4,622)          (5,077)
                                                                            --------        --------         --------
     Total gross consolidated revenues                                       151,348         139,343          137,626
Less outside services                                                         21,388          29,841           19,921
                                                                            --------        --------         --------
     Total net revenue                                                      $129,960        $109,502         $117,705
- - ----------------------------------------------------------------------------------------------------------------------
Profit or Loss
Total operating profit for reportable segments before allocations           $ 9,501         $10,013          $ 6,138
Overhead allocations expense                                                 (5,899)         (5,711)          (6,898)
Unallocated overhead                                                            240             563          (11,511)
                                                                            -------         -------          -------
      Total operating profit (loss) after allocations                         3,842           4,865          (12,271)
Interest income                                                                 548             516              317
Interest expense                                                             (1,234)         (1,251)          (1,112)
Equity in earnings (loss) of affiliates                                         (15)             (2)             227
Minority interest expense                                                        --            (810)            (188)
                                                                             -------         -------          -------
     Income (loss) before provision (benefit) for income taxes              $ 3,141          $3,318         ($13,027)
- - ----------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>

- - ----------------------------------------------------------------------------------------------------------------------

As of December 31,                                                           1998               1997            1996
- - ----------------------------------------------------------------------------------------------------------------------
<S>                                                                         <C>                <C>             <C>
Assets
Accounts receivable for reportable segments                                 $39,347            $36,723         $32,860
Other current assets                                                         14,628             16,658          20,042
Net property and equipment at cost                                           16,519             16,182          14,722
Goodwill, net of amortization                                                14,850             13,916          12,716
Other assets                                                                 10,545              9,596          10,572
                                                                            -------            -------         -------
     Total consolidated assets                                              $95,889            $93,075         $90,912
- - ----------------------------------------------------------------------------------------------------------------------
</TABLE>



                                       28
<PAGE>

<TABLE>
<CAPTION>

3.  Contracts in Progress

Information related to contracts in progress (in thousands):
- - ----------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                                         1998              1997
- - ----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                             <C>              <C>    
Costs incurred on uncompleted contracts                                                         $28,219          $12,995
Estimated earnings on uncompleted contracts                                                       3,380            2,187
                                                                                               --------         --------
                                                                                                 31,599           15,182
Less billings to date on uncompleted contracts                                                   31,686           17,236
- - ----------------------------------------------------------------------------------------------------------------------------
       Total                                                                                    $   (87)         $(2,054)
- - ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

Included  in the  accompanying  consolidated  balance  sheets  on an  individual
contract basis are (in thousands):
- - ----------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                                         1998              1997
- - ----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                             <C>                <C>
Costs and estimated earnings in excess of billings
    on uncompleted contracts.                                                                   $2,511            $   678
Billings in excess of costs and estimated earnings
    on uncompleted contracts                                                                    (2,598)            (2,732)
- - ----------------------------------------------------------------------------------------------------------------------------
        Total                                                                                   $  (87)           $(2,054)
- - ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

4.   Restructuring/Other Charges

In the  fourth  quarter  of  1996,  senior  management  reviewed  the  Company's
operational and  administrative  functions for the purpose of further  improving
the Company's  competitiveness and overall profitability.  Based on this review,
the  Company's  Board of Directors  approved a strategic  restructuring  plan in
December,  1996 to reposition the Company to fully exploit its core strengths in
engineering,  design,  construction,  operations and maintenance. As a result of
these actions, the Company recognized pre-tax restructuring and other charges of
$1,237,000 and $6,960,000,  respectively.  Included in the restructuring  charge
were $604,000  related to the closure or  downsizing of several  underperforming
offices,  $628,000 related to employee severance and the write-off of employment
contracts for former employees no longer actively participating in the Company's
affairs,  and a $5,000 adjustment to the 1994  restructuring  plan.  Included in
other charges were $4,768,000 related to the write-down in the carrying value of
goodwill associated with the Company's  continuing operating units in accordance
with the Statement of Financial  Accounting  Standards No. 121,  "Accounting for
the  Impairment of Long-Lived  Assets and for  Long-Lived  Assets to Be Disposed
Of", $1,529,000 related to the write-off of idle or disposed of assets, $368,000
related to the write-down of the Company's  landfill gas  production  rights and
related fixed assets,  and $156,000  related to the buyout and  cancellation  of
outstanding  stock  options  to  purchase  approximately  743,000  shares of the
Company's common stock held by employees of the Company. Also, included in other
charges were $139,000 for various  other  operational  costs.  Fair value of the
goodwill associated with the Company's  continuing  operating units was based on
each operating unit's expected future discounted cash flows.

As of December 31, 1998,  $367,000 of the 1996  restructuring  charges have been
paid and $275,000 remains in other accrued liabilities. Net reductions of $4,000
and $586,000 to the reserve  were  recorded in 1998 and 1997,  respectively,  to
reflect  lower  than  anticipated  costs  associated  with the  abandonment  and
subsequent sublease of certain office space and lower than anticipated severance
costs due to retaining certain previously identified personnel.



                                       29
<PAGE>


5. Impairment of Assets Held for Sale/Loss on Disposition of Laboratory

In  December  1996,  the  Company  executed  a letter  of intent to sell its CAS
laboratory  line of business  to the  employees  of CAS by the first  quarter of
1997. In anticipation  of the sale, the Company  recognized an impairment in its
investment in CAS of $3,327,000; including a write-down in the carrying value of
goodwill associated with previous laboratory acquisitions of $1,426,000. For the
year ended December 31, 1996, CAS had a loss before taxes of $142,000.

During the first quarter of 1997,  the Company  completed the sale of CAS to the
employees of CAS for $4,000,000 in cash,  CAS'  promissory  notes for $3,219,000
("CAS  Notes")  and a  continuing  preferred  stock  interest  in CAS  valued at
$500,000.  The  Company  paid  $206,000  in  cash to CAS  for  retired  employee
contracts  and for  accelerated  vesting of stock  options and other  non-vested
stock rights. As a result of several closing adjustments, the Company recognized
an  additional  loss  on  disposition  of CAS in the  first  quarter  of 1997 of
$333,000.  CAS and the Company  also  entered  into a Master  Service  Agreement
(subsequently  amended  April,  1998)  relating to the  continued  provision  of
laboratory  services to the Company  (the  "MSA").  The CAS Notes are subject to
offset,  in certain  circumstances,  based upon the levels of future revenues to
CAS accruing  under the amended MSA. The Company  currently  does not anticipate
that any  material  offset  will occur  under the terms of the  amended  MSA. At
December  31,  1998,  the  outstanding  principal  balance  of the CAS Notes was
$2,435,000,  of which $436,000 and $1,999,000 were recorded in the  consolidated
balance  sheet in prepaid and other  current  assets,  and in notes  receivable,
respectively.  The notes bear interest at a rate of 8%  compounded  annually and
mature in April, 2004. Payments of interest and principal are due quarterly.

6.   Notes Receivable and Advances

During the year ended December 31, 1998, the Company provided a $500,000 loan to
e-Com  Solutions,  Inc.  ("e-Com"),  an unrelated third party, in exchange for a
convertible promissory note receivable.  The note bears interest at a rate of 9%
compounded annually and matures on demand, but not later than December 31, 2000.
In  addition,  the Company has  provided  $770,000 of  non-interest  bearing net
short-term  cash advances to e-Com to fund its working  capital  requirements in
connection  with its start-up  activities.  e-Com is in the business of high-end
technical consulting, specializing in computer network integration,  e-Commerce,
and the development of web-based tools. The note agreement  entitles the Company
to convert its  outstanding  principal  and accrued  interest  into e-Com common
shares at a rate of $0.064516 per share at the Company's sole  discretion  after
June 30,  1998.  Should the Company  convert  the entire note into e-Com  common
shares, the Company would be a majority  shareholder  (holding  approximately an
83% interest) of e-Com.

The  Company's  recovery of the note  receivable  balance  and  related  accrued
interest and advances of working  capital is dependent  upon e-Com's  ability to
successfully  execute its business  plan and generate  sufficient  cash flows to
repay its  obligations.  It is  reasonably  possible  that e-Com's  estimates of
future cash flows may change in the near term. As a result,  the carrying amount
of the note and interest  receivable  and advances may be materially  reduced in
the future.

In connection  with the  acquisition of A2S as further  discussed in Note 8, the
Company extended a note receivable to one of A2S's former officers for $225,000.
The note bears  interest at a rate of 8% compounded  annually and matures on the
third anniversary (April,  2001) of the note date. Repayment is secured by EMCON
stock (approximately  56,000 shares) and rights to subsequent earnouts of A2S to
which the borrower may be entitled.

See note 5 for discussion of the CAS notes receivable.



                                       30
<PAGE>


7.   Other Dispositions

During the first quarter of 1997,  the Company  completed the sale of one of its
landfill  gas-to-energy  projects,  including the related  leasehold  production
rights and associated machinery and equipment.  The Company recognized a gain on
disposition of the project in 1997 of $1,026,000.

8.   Acquisitions

Goodwill:  On April 3, 1998, EMCON acquired all of the outstanding capital stock
of Advanced  Analytical  Solutions,  Inc.  ("A2S"),  a provider  of  alternative
dispute  resolution,  cost  allocation,  cost recovery,  and litigation  support
services primarily for superfund projects.  A2S has offices in Denver,  Colorado
and Philadelphia,  Pennsylvania. The Company purchased A2S for $593,000 in stock
and $601,000 in cash and direct acquisition costs. The transaction was accounted
for as a purchase.  Goodwill of approximately $1,150,000 is being amortized over
twenty  years  using  the  straight-line  method.  Accumulated  amortization  at
December 31, 1998, was approximately  $43,000.  Additional  consideration may be
paid  for the  purchase  of A2S  subject  to the  achievement  of  predetermined
operating  performance  goals over the next two years. The acquisition would not
have had a material affect on consolidated  net revenue,  net income or earnings
per share, had it been effective at January 1, 1998.

On December 4, 1998,  Organic Waste  Technologies,  Inc. ("OWT"), a wholly-owned
subsidiary of EMCON,  acquired all of the  outstanding  capital stock of Western
Industrial Resources Corporation ("WI"), an industrial  maintenance  outsourcing
firm based in Arizona. The Company purchased WI for $155,000 in cash and assumed
liabilities  in excess of assets  acquired  of  $103,000.  The  transaction  was
accounted  for as a  purchase.  Goodwill  of  approximately  $258,000  is  being
amortized   over  ten  years  using  the   straight-line   method.   Accumulated
amortization  at  December  31,  1998,  was  approximately  $1,000.   Additional
consideration  may be paid for the purchase of WI subject to the  achievement of
predetermined  operating  performance  goals  over the  next  three  years.  The
acquisition  would not have had a material affect on  consolidated  net revenue,
net income, or earnings per share, had it been effective at January 1, 1998.

Effective May 1, 1997, OWT acquired all of the  outstanding  equity  interest in
National Earth Products, Inc. ("NEP"), a Lancaster,  Pennsylvania-based  company
with  significant  expertise in landfill  civil  construction  and related soils
processing.  NEP was  acquired  for $933,000 in cash and the issuance of EMCON's
convertible  promissory  notes in the  aggregate  principal  amount of $800,000.
Approximately  50% of the  convertible  notes are due on May 1,  2000,  with the
balance due on May 1, 2002.  The  indebtedness  bears interest at the rate of 8%
per annum and is  convertible  into EMCON common stock at a conversion  price of
$6.50 per share.  The transaction was accounted for as a purchase.  Specifically
identifiable   intangible  assets  and  goodwill  of  approximately   $1,601,000
resulting from this acquisition are being amortized over twenty-five years using
the straight line method.  Accumulated  amortization as of December 31, 1998 and
1997, was approximately $102,000 and $39,000, respectively. Included in goodwill
is an additional  $125,000 cash payment made to the former NEP  shareholders  in
May,  1998  as  a  result  of  NEP  attaining  certain  predetermined  operating
performance  goals following its acquisition.  Additional  consideration  may be
paid for the  purchase of NEP  subject to the  achievement  of certain  earn out
goals over the next year to be  measured  as of April,  1999.  This  acquisition
would not have had a material effect on consolidated net revenue, net income, or
income per share, had it been effective at January 1, 1997.

On February 29, 1996, EMCON acquired all the outstanding capital stock of OWT, a
Cleveland based  construction,  equipment and operations and maintenance company
with significant expertise in solid waste management.  The Company purchased OWT
for  $13,859,000  in cash  plus the  issuance  of  convertible  notes  and other
contractual  indebtedness  to certain  senior OWT  management  in the  aggregate
principal amount of $1,747,000. The transaction was accounted for as a purchase.
The indebtedness bears interest at the rate of


                                       31
<PAGE>


8% per annum with all  principal  due and payable in full on March 1, 2001.  The
indebtedness  may  be  converted  into  shares  of  OWT  common  stock  upon  an
underwritten  public  offering of OWT's  common  stock in an amount in excess of
$10,000,000.  In the  event the  indebtedness  has not been  converted  into OWT
shares,  it may instead be  converted  into shares of EMCON  common  stock for a
period of ninety days after  November 30, 2001,  at a conversion  price of $6.50
per share.  Goodwill of  approximately  $11,382,000,  which  included a $253,000
increase  resulting  from the  establishment  of a deferred tax asset related to
this  acquisition,  is being amortized over thirty years using the straight line
method.  Related  accumulated  amortization  at December 31, 1998 and 1997,  was
approximately $1,068,000 and $689,000, respectively.

Acquisitions  made by the  Company  from  1992  through  1994 have  resulted  in
goodwill of approximately  $3,112,000  which is included with intangible  assets
and is being  amortized  over a period of twenty  years using the  straight-line
method.  Related  accumulated  amortization  was  approximately  $1,439,000  and
$1,327,000 at December 31, 1998 and 1997, respectively.

Other  Intangible  Assets:  Other  intangible  assets at December 31, 1998, also
include $989,000, representing the gross cost to reacquire certain patent rights
associated  with  the  Company's   proprietary   leachate   evaporation   system
technology.  Accumulated  amortization  at  December  31,  1998  and  1997,  was
approximately $137,000 and $74,000,  respectively. The patent is being amortized
over the fifteen year life of the patent.

9.   Other Noncurrent Obligations

Certain employees  participate in a salary  continuation plan which will provide
the employees with a 10-year  benefit from the Company.  Monthly  benefits range
from $600 to $4,500, and the employees vest in varying amounts from the fifth to
the tenth  anniversary  date of their  contracts.  Such  amounts will be paid in
addition to those payments due specifically as  consideration  for the employees
meeting the  non-competition  provisions of their  contracts.  Included in other
noncurrent   obligations  are  the  Company's   liabilities   under  the  salary
continuation  agreements.  Liabilities under salary continuation agreements were
$1,097,000  and  $1,088,000  at  December  31, 1998 and 1997,  respectively  and
represent the estimated present value of the future obligation discounted at the
Company's  incremental  borrowing  rate of 7.5%.  These  liabilities  have  been
indirectly  funded  through  insurance  policies  which  are  recorded  at their
estimated cash surrender value.

The  Company  also  provides,  for  certain  employees,  a Company  contributory
deferred  compensation  plan.  Contributions  by the Company  were  $430,000 and
$387,150  in 1998 and 1997,  respectively.  Cumulative  individual  compensation
liabilities  range from $10,000 to $124,817 and vest in varying amounts from one
year to six years and accrue interest.  Deferred  compensation  liabilities were
$254,000  and $43,000 as of December  31, 1998 and 1997,  respectively,  and are
included in non-current liabilities.

Capital lease obligations are included in property and equipment with a cost and
accumulated depreciation of $101,000 and $30,000,  respectively, at December 31,
1998, and $87,000 and $44,000, respectively, at December 31, 1997.



                                       32
<PAGE>


10.  Retirement Plan

The Company  sponsors a qualified  retirement plan,  generally  available to all
employees,  which is based on  Section  401(k)  of the  Internal  Revenue  Code.
Employees may elect to contribute up to 20% of their annual  compensation to the
plan up to the Internal  Revenue Code annual  contribution  limit of $10,000 and
$9,500 for 1998 and 1997,  respectively.  Prior to 1997, the Company voluntarily
matched the employee's  contribution to a maximum of 3% of annual  compensation.
In 1997 and 1998,  the  Company  elected  to  suspend  the  Company  match.  The
Company's  contributions  to the  retirement  plan were  $1,146,000 for the year
ended December 31, 1996.

11.  Commitments

The Company's  minimum annual lease  commitments  under all operating leases for
the five years subsequent to December 31, 1998 are approximately (in thousands):

- - --------------------------------------------------------------------------------
Years Ending December 31,
- - --------------------------------------------------------------------------------
1999                                                                      $5,143
2000                                                                       3,779
2001                                                                       2,345
2002                                                                       1,310
2003                                                                         593
- - --------------------------------------------------------------------------------

Rent expense was  approximately  $4,271,000,  $5,523,000  and $5,263,000 for the
years ended December 31, 1998, 1997 and 1996, respectively.

Certain employees have signed non-competition agreements which will provide them
with  monthly  payments  from  $400 to $3,000  for a period of up to ten  years,
commencing on the tenth anniversary date of the agreements. (See note 9.)

12.  Litigation

As a firm  engaged in  environmental-related  matters,  the  Company  encounters
potential liability,  including claims for significant  environmental damage, in
the normal course of business.  The Company is party to lawsuits and is aware of
potential exposure related to certain claims. In the fourth quarter of 1996, the
Company agreed to settlement terms on a number of outstanding legal matters.  At
the same time, the Company assessed the potential exposure relative to all other
known pending matters.  Based on the foregoing,  the Company increased its legal
reserve by an  additional  $1,553,000  at  December  31,  1996.  No  significant
increases  to legal  reserves  occurred  in 1998 and  1997.  In the  opinion  of
management,  the resolution of all known lawsuits/claims at amounts in excess of
established  reserves will not have a material  adverse  affect on the Company's
consolidated financial position, results of operations or cash flows.



                                       33
<PAGE>

<TABLE>
<CAPTION>

13.  Long-term Debt

Long-term debt consists of the following (in thousands):
- - -------------------------------------------------------------------------------------------- -------------- -------------
Years Ended December 31,                                                                         1998           1997
- - -------------------------------------------------------------------------------------------- -------------- -------------
<S>                                                                                             <C>             <C>
Variable-rate note payable to bank                                                              $ 3,429         $ 4,857
     (effective rate at 12/31/98 and 12/31/97 was 6.77% and 7.46%,  respectively).  Payable     
     in  quarterly   installments   of  $357  with  a  final   payment  of  $571  in  2001.
     Collateralized by the assets of EMCON.
8.00%  unsecured notes payable to certain former OWT  shareholders.  Payable on termination       1,747           1,747
     date in 2001.  This  debt may be  converted  into  common  stock at $6.50  per  share.
     Conversion  of debt,  if it occurs,  would be within  ninety days after  November  30,
     2001.
7.99% note payable to bank in monthly  installments through 2006.  Cross-collateralized  by       3,937           4,285
     the assets of OWT with a net book value of $9,372.
8.49%  note  payable  to bank in  monthly  installments  through  2001.  Collateralized  by         202             284
     equipment of OWT with a net book value of $268.
8.99% note payable to bank in monthly  installments through 2000.  Cross-collateralized  by         130             206
     the assets of OWT with a net book value of $9,372.
7.89% note payable to bank in monthly  installments through 2012.  Cross-collateralized  by       1,085           1,158
     the assets of OWT with a net book value of $9,372.
8.00%  unsecured  notes  payable  to  former  NEP  shareholders.  Approximately  50% of the         800             800
     convertible  notes are due on May 1, 2000 with the  balance  due on May 1, 2002.  This
     debt may be converted  into common stock at $6.50 per share.  Conversion  of debt,  if
     it occurs, would be 50% on May 1, 2000, and 50% on May 1, 2002.
9.07%  note   payable  to  finance   company   in  monthly   installments   through   2001.         107             142
     Collateralized by equipment of NEP with a net book value of $53.
Other indebtedness,  interest rates vary from 5.3% to 15.9% payable in installments through         140             312
    2000.  (Primarily lease obligations)
                                                                                             ----------------------------
Total Long-term Debt                                                                            $ 11,577        $13,791

Less current portion                                                                            $  2,177        $ 2,350
- - -------------------------------------------------------------------------------------------------------------------------
Long-term Debt, net of current portion                                                          $  9,400        $11,441
- - -------------------------------------------------------------------------------------------------------------------------
</TABLE>

Interest  paid  on all  outstanding  debt  amounted  to  $956,000  in  1998  and
$1,135,000 in 1997.

Aggregate  principal  payments for the next five years for years ending December
31,

- - --------------------------------------------------------------------------------
1999                                                                    $  2,177
2000                                                                       2,575
2001                                                                       1,175
2002                                                                       2,767
2003                                                                         647
thereafter                                                                 2,236
- - --------------------------------------------------------------------------------


                                       34
<PAGE>


In  conjunction  with  the  acquisition  of  OWT,  the  Company  entered  into a
$20,000,000   secured  credit  agreement  with  its  existing  commercial  bank,
replacing  its  previous  $10,000,000  unsecured  line of credit.  Under the new
agreement,  the Company borrowed  $10,000,000 on a term loan basis with interest
at a managed  rate not to exceed the prime rate.  Principal  is to be  amortized
over seven years, but with any unpaid amount finally due and payable on June 30,
2001.  Amounts  outstanding  under the term loan as of  December  31,  1998 were
$3,429,000.  The line of credit  component of the Credit  Agreement is available
for working capital purposes. No amount was outstanding as of December 31, 1998.
Subsequent to year-end, the line of credit component of the Credit Agreement was
extended  to April  30,  1999 at a level of  $5,000,000.  The  Credit  Agreement
contains  provisions  with respect to the payment of dividends  and the level of
capital  expenditures and requires the maintenance of specific levels of working
capital, tangible net worth and continued quarterly profitability.

14.  Shareholders' Equity

Preferred  Stock:  The Board of  Directors  of the Company has the  authority to
determine the rights, preferences, privileges and restrictions of the authorized
preferred stock.

Stock  Option and  Restricted  Stock  Plans:  The Company has issued  options to
purchase  shares of common stock pursuant to its 1986 and 1988  Incentive  Stock
Option  Plans  (both  expired in 1997) and its 1998  Stock  Option  Plan.  These
options were granted with option  exercise  prices which are equal to 100%, 105%
or 110% of fair market value on the date of grant, and expire over terms ranging
from five to ten years.  Options  generally vest ratably over a two year or four
year period.

The Company's  Restricted  Stock Plan was approved by its  shareholders  in May,
1991. A total of 225,000 shares of the Company's  common stock were reserved for
issuance under the Restricted Stock Plan.  Shares granted to employees under the
Restricted Stock Plan generally vest in equal annual  installments  over periods
ranging  from three to four years.  At December 31,  1998,  119,573  shares were
available for issuance.

<TABLE>
<CAPTION>

A summary of activity of the Plans follows:
- - --------------------------------------------------------------------------------------------------------------------------
                                                                                  Options Outstanding
                                                               -----------------------------------------------------------
                                               Available            Number               Price              Aggregate
                                               for Grant           of Shares           Per Share              Value
- - --------------------------------------------------------------------------------------------------------------------------
<S>                                            <C>                <C>                <C>                   <C>        
Balance at December 31, 1995                    524,263           2,510,358          $3.33 - $11.25        $18,365,193
- - --------------------------------------------------------------------------------------------------------------------------
Options granted                                (192,448)            192,448          $3.25 - $ 4.88            728,144
Options canceled                              1,518,674          (1,518,674)         $3.33 - $11.25        (12,357,381)
Options exercised                                 --                 (4,700)         $3.33 - $ 3.50            (15,698)
- - --------------------------------------------------------------------------------------------------------------------------
Balance at December 31, 1996                  1,850,489           1,179,432          $3.25 - $11.25        $ 6,720,258
- - --------------------------------------------------------------------------------------------------------------------------
Options granted                              (1,261,500)          1,261,500          $3.13 - $ 5.00          5,250,375
Options canceled                                534,043            (534,043)         $3.25 - $11.25         (3,030,431)
Options exercised                                 --                (42,374)         $3.33 - $ 3.75           (150,621)
Options expired                              (1,004,671)                --                 --                  --
- - --------------------------------------------------------------------------------------------------------------------------
Balance at December 31, 1997                    118,361           1,864,515          $3.13 - $10.00          8,789,581
- - --------------------------------------------------------------------------------------------------------------------------
Options authorized                            1,000,000               --                   --                  --
Options granted                                (510,500)            510,500          $2.69 - $ 4.50          1,568,764
Options canceled                                 58,286             (58,286)         $3.25 - $10.00           (188,465)
Options exercised                                 --                (29,470)         $3.25 - $ 4.13           (104,731)
Options expired                                 (57,074)              --                   --                  --
- - --------------------------------------------------------------------------------------------------------------------------
Balance at December 31, 1998                    609,073           2,287,259          $2.69 - $10.00        $10,065,149
- - --------------------------------------------------------------------------------------------------------------------------
</TABLE>


                                       35
<PAGE>


Employee  Stock  Purchase  Plan:  The EMCON  Employee Stock Purchase Plan (ESPP)
provided that  substantially  all employees could purchase the Company's  common
stock at a price equal to 85% of its fair value on certain specified dates via a
payroll deduction plan. At December 31, 1996,  248,338 shares were available for
issuance. The Company discontinued the ESPP effective February 1, 1997.

Stock-Based Compensation: As permitted under FASB Statement No. 123, "Accounting
for  Stock-Based  Compensation"  (FASB  123),  the Company has elected to follow
Accounting  Principles  Board  Opinion No. 25,  "Accounting  for Stock Issued to
Employees" (APB 25) in accounting for stock-based awards to employees. Under APB
25, the Company  generally  recognizes no  compensation  expense with respect to
such awards.

Pro Forma information  regarding net income (loss) and earnings (loss) per share
is required by FASB 123 for awards  granted  after  December 31, 1994, as if the
Company had accounted  for its  stock-based  awards to employees  under the fair
value method of FASB 123. For these  purposes,  the fair value of the  Company's
stock-based  awards to employees  was  estimated  using a  Black-Scholes  option
valuation model. The Black-Scholes  option valuation model was developed for use
in  estimating   the  fair  value  of  traded  options  which  have  no  vesting
restrictions and are fully  transferable.  In addition,  the Black-Scholes model
requires the input of highly subjective assumptions including the expected stock
price  volatility.  Because the Company's  stock-based  awards to employees have
characteristics  significantly  different  from  those of  traded  options,  and
because changes in the subjective  input  assumptions can materially  affect the
fair  value  estimate,  in  management's  opinion,  the  existing  models do not
necessarily  provide  a  reliable  single  measure  of  the  fair  value  of its
stock-based  awards to employees.  The fair value of the  Company's  stock-based
awards to  employees  was  estimated  assuming  no  expected  dividends  and the
following weighted-average assumptions.


<TABLE>
<CAPTION>

- - ------------------------------------------------------------------------------------------------------------------------------
                                                             Options                                      ESPP
                                                             -------                                      ----
                                                1998            1997           1996          1998         1997         1996
- - ------------------------------------------------------------------------------------------------------------------------------
<S>                                              <C>             <C>           <C>            <C>          <C>         <C>
Expected life (years)                            5.0             4.5           6.6            --           --          0.5
Expected volatility                               .80             .66           .49           --           --           .32
Risk-free interest rate                          4.9%            6.1%          6.1%           --           --          5.5%
- - ------------------------------------------------------------------------------------------------------------------------------
</TABLE>

For pro forma  purposes,  the estimated fair value of the Company's  stock-based
awards to employees is amortized over the options'  vesting period (for options)
and the six-month  purchase  period (for stock  purchases  under the ESPP).  The
Company's pro forma information follows:
<TABLE>
<CAPTION>

- - ------------------------------------------------------------------------------------------------------------------------------

In thousands except for earnings (loss) per share information                           1998         1997            1996
- - ------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                      <C>       <C>             <C>
Net income (loss)
     As reported                                                                         $1,633    $2,157          $(10,091)
     Pro forma                                                                           $1,089    $1,918          $(10,311)
Basic (loss) earnings per share
     As reported                                                                         $ 0.19    $ 0.25          $  (1.19)
     Pro forma                                                                           $ 0.13    $ 0.22          $  (1.22)
- - ------------------------------------------------------------------------------------------------------------------------------
</TABLE>

Because FASB 123 is applicable only to awards granted subsequent to December 31,
1994, its pro forma effect will not be fully reflected until approximately 1999.

The weighted  average fair value of options  granted during 1998,  1997 and 1996
was $1.93, $2.11 and $2.14 per share, respectively.



                                       36
<PAGE>

<TABLE>
<CAPTION>

The following  summarizes  information about fixed stock options  outstanding at
December 31, 1998:
- - --------------------------------------------------------------------------------------------------------------------------
                                Options Outstanding                                           Options Exercisable
                                                                        Weighted                             Weighted
                              Number          Weighted Average          Average                              Average
Range of Exercise Prices  Outstanding at    Remaining Contractual    Exercise Price        Number         Exercise Price
                             12/31/98               Life                                 Exercisable
- - --------------------------------------------------------------------------------------------------------------------------
     <S>                      <C>                   <C>                  <C>                <C>              <C>
     $9.25 - $10.00             171,300             3.61                 $9.31              171,300          $9.31
      6.50 -   8.83              69,950             4.60                  6.98               69,950           6.98
      5.00 -   6.00             680,500             4.03                  5.02               22,000           5.26
      2.69 -   4.88           1,365,509             4.49                  3.34              361,843           3.71
- - --------------------------------------------------------------------------------------------------------------------------
     $2.69 - $10.00           2,287,259             4.29                 $4.40              625,093          $5.66
- - --------------------------------------------------------------------------------------------------------------------------
</TABLE>

As of December 31, 1997,  415,153 shares were exercisable at an average exercise
price of $6.67 per share.

In December,  1996,  employees  (other than officers and directors) with options
having  exercise  prices of $5.00 per share or  greater  were given the right to
either sell back their options to the Company, to exchange their options for new
options,  to retain  their  original  options or to elect a  combination  of the
three.  The rates at which the  outstanding  options  could be exchanged or sold
back to the Company  varied  depending on the original  option  exercise  price.
Participants  could exchange their  outstanding  stock options for newly granted
options at rates ranging from one new share for every three old option shares to
one new share for every  five old  option  shares.  Alternatively,  participants
could sell back their  options at prices  ranging from $0.10 to $0.40 per option
share.  This  resulted in options for 743,319  shares being  canceled for a cash
settlement of  approximately  $156,000,  and options for an  additional  203,727
shares being canceled in exchange for the grant of new options  covering  47,247
shares with an option exercise price of $3.68 per share.


                                       37
<PAGE>

<TABLE>
<CAPTION>

15.  Earnings Per Share

- - ---------------------------------------------------------------------------------------------------------------------------
                                                                                     Years Ended December 31,
(In thousands, except for earnings per share)                                 1998               1997             1996
- - ---------------------------------------------------------------------------------------------------------------------------
<S>                                                                        <C>                 <C>              <C>
Numerator:
    Net income (loss)                                                      $ 1,633             $ 2,157          $(10,091)
                                                                           -------             -------          ---------
    Numerator for basic earnings per share -
        income (loss) available to common stockholders                     $ 1,633             $ 2,157          $(10,091)

    Effect of dilutive securities:
        8% convertible debentures                                              N/A(1)              N/A(1)             --
                                                                           -------             -------          --------

    Numerator for diluted earnings per share -
        income (loss) available to common stockholders
        after assumed conversions                                          $ 1,633             $ 2,157          $(10,091)
                                                                           -------             -------          --------

 Denominator:
    Denominator for basic earnings (loss) per share -
      weighted-average shares                                                8,648               8,549             8,485

    Effect of dilutive securities:
        Employee stock options                                                 147                 144                --
        8% convertible debentures                                              N/A(1)              N/A(1)             --
                                                                           -------             -------          --------

    Dilutive potential common shares
    Denominator for diluted earnings per share -
        adjusted weighted average shares and assumed
        conversions                                                          8,795               8,693                --
                                                                           =======             =======          ========

    Basic earnings (loss) per share                                       $   0.19             $  0.25          $  (1.19)
                                                                          ========             =======          ========

    Diluted earnings per share                                            $   0.19             $  0.25                --
                                                                          ========             =======          ========

- - ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)Excluded from the above  reconciliations were approximately 269,000 shares of
common  stock  that may be issued at $6.50 per share to  convert  $1,747,000  of
indebtedness to certain senior  management of OWT because they were antidilutive
at December 31, 1998 and 1997.
Conversion of debt, if it occurs, would be within ninety days after November 30,
2001.

Also excluded from the above  reconciliations were approximately  123,000 shares
of common  stock  that may be issued at $6.50 per share to convert  $800,000  of
indebtedness to certain senior  management of NEP because they were antidilutive
at December 31, 1998 and 1997. Conversion of debt, if it occurs, would be 50% at
May 1, 2000, and 50% at May 1, 2002.



                                       38
<PAGE>

16.  Income Taxes

The  provision  (benefit)  for  income  taxes  consists  of  the  following  (in
thousands):

<TABLE>
<CAPTION>

- - ---------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                           1998              1997           1996
- - ---------------------------------------------------------------------------------------------------------------------------
<S>                                                                              <C>               <C>             <C>
Federal:
   Current                                                                       $  330            $   43          $  607
   Deferred                                                                         768               832          (3,358)
- - ---------------------------------------------------------------------------------------------------------------------------
        Total Federal                                                            $1,098            $  875         ($2,751)
- - ---------------------------------------------------------------------------------------------------------------------------
State:
   Current                                                                       $  476            $  179          $   73
   Deferred                                                                         (66)              107            (258)
- - ---------------------------------------------------------------------------------------------------------------------------
        Total State                                                              $  410            $  286         ($  185)
- - ---------------------------------------------------------------------------------------------------------------------------
        Total Federal and State                                                  $1,508            $1,161         ($2,936)
- - ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

A  reconciliation  between the  Company's  effective  tax rate of 48.0% in 1998,
35.0% in 1997,  and  (22.5%)  in 1996 and the U.S.  statutory  rate of 34% is as
follows (in thousands):
<TABLE>
<CAPTION>

- - ---------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                         1998              1997           1996
- - ---------------------------------------------------------------------------------------------------------------------------
<S>                                                                              <C>               <C>           <C>     
Tax at U.S. statutory rate                                                       $1,068            $1,128        ($4,559)
State taxes, net of federal benefit                                                 185               189           (280)
Fuel tax credits                                                                   (170)             (416)          (454)
Goodwill amortization                                                               203               180          2,306
Meals and entertainment                                                             185                90             94
Other individually immaterial items                                                  37               (10)           (43)
- - ---------------------------------------------------------------------------------------------------------------------------
        Total Federal and State                                                  $1,508            $1,161        ($2,936)
- - ---------------------------------------------------------------------------------------------------------------------------
As of December 31, 1998, the Company has federal  alternative minimum tax credit
carryforwards of approximately $1,386,000 which have no expiration date.
</TABLE>


                                       39
<PAGE>


Deferred  income  taxes  reflect  the net tax effects of  temporary  differences
between the carrying  amounts of assets and liabilities for financial  reporting
purposes and the amounts used for income tax purposes. Significant components of
the Company's deferred tax assets and liabilities consisted of the following (in
thousands):
<TABLE>
<CAPTION>

- - -------------------------------------------------------------------------------------------------------------------------------
As of December 31,                                                                                     1998          1997
- - -------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                                    <C>           <C>
Deferred tax assets:
     Alternative minimum tax credit carryforwards                                                      $1,386        $1,980
     Deferred compensation                                                                                370           342
     Allowance for doubtful accounts                                                                      631           318
     Vacation accruals                                                                                    715           582
     Restructuring accruals                                                                               871         2,330
     Book over tax depreciation                                                                           149            --
     Other individually immaterial items                                                                  439           221
- - -------------------------------------------------------------------------------------------------------------------------------
         Total deferred tax assets                                                                     $4,561        $5,773
- - -------------------------------------------------------------------------------------------------------------------------------
Deferred tax liabilities:
     Tax over book depreciation                                                                        $   --        $  436
     Tax accounting method changes                                                                         95            72
     Payment liabilities deducted                                                                          --             2
- - -------------------------------------------------------------------------------------------------------------------------------
         Total deferred tax liabilities                                                                $   95        $  510
- - -------------------------------------------------------------------------------------------------------------------------------
Total net deferred tax assets                                                                          $4,466        $5,263
- - -------------------------------------------------------------------------------------------------------------------------------
</TABLE>

17.  Related Party Transactions

The Company's Chief Financial Officer, currently serves as a member of the Board
of  Directors  of  Columbia  Analytical  Services,  Inc.  (CAS),  an  analytical
laboratory company in which the Company retains a minority interest. CAS remains
a significant outside vendor of laboratory services to the Company.


                                       40
<PAGE>


<TABLE>
<CAPTION>

18.  Quarterly Data (unaudited)

- - --------------------------------------------------------------------------------------------------------------------------
(In thousands                                               First             Second           Third          Fourth
except per share amounts)                                  Quarter           Quarter          Quarter         Quarter
- - --------------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>                <C>               <C>           <C>
1997
Gross revenue                                             $31,363            $33,114           $40,764       $34,102
Net revenue                                                27,581             24,467            29,899        27,555
Income from operations                                      1,317              1,084             1,789           675
Net income                                                    691                494               943            29
Basic earnings per share                                  $  0.08            $  0.06           $  0.11       $  0.00
Diluted earnings per share                                $  0.08            $  0.06           $  0.11       $  0.00
- - --------------------------------------------------------------------------------------------------------------------------
1998
Gross revenue                                             $28,779            $40,985           $41,585       $39,999
Net revenue                                                25,822             36,209            35,631        32,298
Income from operations                                        143              1,190             1,568           941
Net income                                                     20                574               730           309
Basic earnings per share                                  $  0.00            $  0.07           $  0.08       $  0.04
Diluted earnings per share                                $  0.00            $  0.07           $  0.08       $  0.04
- - --------------------------------------------------------------------------------------------------------------------------
</TABLE>

Historically,  the Company's net revenue is adversely  affected in the first and
fourth quarters of each year, primarily as a result of restricted field work due
to weather conditions.


                                       41
<PAGE>

                         REPORT OF INDEPENDENT AUDITORS

The Board of Directors and Shareholders
EMCON

We have  audited the  accompanying  consolidated  balance  sheets of EMCON as of
December  31,  1998  and  1997,  and  the  related  consolidated  statements  of
operations,  shareholders' equity, and cash flows for each of the three years in
the period  ended  December  31, 1998.  Our audits also  included the  financial
statement  schedule  listed  in the  Index  at Item  14(a)(2).  These  financial
statements and schedule are the responsibility of the Company's management.  Our
responsibility  is to  express  an opinion  on these  financial  statements  and
schedule based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated  financial statements referred to above present
fairly, in all material respects,  the consolidated  financial position of EMCON
at December 31, 1998 and 1997,  and the  consolidated  results of its operations
and its cash flows for each of the three years in the period ended  December 31,
1998, in conformity with generally accepted accounting principles.  Also, in our
opinion,  the related financial statement schedule,  when considered in relation
to the  basic  financial  statements  taken as a whole,  presents  fairly in all
material respects the information set forth therein.

                                                              ERNST & YOUNG LLP

San Francisco, California
February 23, 1999




                                       42
<PAGE>


Item 9.       Changes  in  and Disagreements  with Accountants on Accounting and
              Financial Disclosure

None
                                    PART III


Item 10.      Directors and Executive Officers of the Registrant

       The  information  required under this Item is  incorporated  by reference
from the  Registrant's  definitive  proxy  statement for the  Registrant's  1999
Annual Meeting of Shareholders  to be filed with the Commission  within 120 days
of the end of Registrant's fiscal year ended December 31, 1998.

Item 11.      Executive Compensation

       The  information  required under this Item is  incorporated  by reference
from the  Registrant's  definitive  proxy  statement for the  Registrant's  1999
Annual Meeting of Shareholders  to be filed with the Commission  within 120 days
of the end of Registrant's fiscal year ended December 31, 1998.

Item 12.      Security Ownership of Certain Beneficial Owners and Management

       The  information  required under this Item is  incorporated  by reference
from the  Registrant's  definitive  proxy  statement for the  Registrant's  1999
Annual Meeting of Shareholders  to be filed with the Commission  within 120 days
of the end of Registrant's fiscal year ended December 31, 1998.

Item 13.      Certain Relationships and Related Transactions

       The  information  required under this Item is  incorporated  by reference
from the  Registrant's  definitive  proxy  statement for the  Registrant's  1999
Annual Meeting of Shareholders  to be filed with the Commission  within 120 days
of the end of Registrant's fiscal year ended December 31, 1998.



                                       43
<PAGE>

                                     PART IV

Item 14.   Exhibits, Financial Statement Schedules, and Reports on 
           Form 8-K                                                      Page
                                                                        ------

(a)(1)          Financial Statements                                      18

(a)(2)          Schedule II - Valuation and Qualifying Accounts           46

(b)             Reports on Form 8-K                                       --

                No  reports  on Form 8-K were filed  during  
                the  quarter  ended December 31, 1998.                    47

(c)             Index to Exhibits 

                     Exhibits filed herewith and attached  hereto under separate
                     cover or incorporated by reference herein will be furnished
                     to security  holders of the Registrant upon written request
                     and payment of a fee of $.30 per page which fee covers only
                     the  Registrant's  reasonable  expenses in furnishing  such
                     exhibits.





                                       44
<PAGE>

                                   SIGNATURES

       Pursuant  to the  requirements  of Section 13 or 15(d) of the  Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
                                      EMCON

Dated:  March 25, 1999                 By  /s/ Eugene M. Herson
        -------------------                ---------------------
                                           Eugene M. Herson
                                           President and Chief Executive Officer

       Pursuant to the requirements of the Securities Exchange Act of 1934, this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
Registrant in the capacities and on the dates indicated.
<TABLE>
<CAPTION>

      Signature                                 Title                             Date
      ---------                                 -----                             ----
<S>                             <C>                                           <C> 
/s/ Douglas P. Crane            Chairman of the Board and Director            March 25, 1999
- - ---------------------
Douglas P. Crane


/s/ Eugene M. Herson            President, Chief Executive Officer            March 25, 1999
- - ---------------------           and Director (Principal Executive  
Eugene M. Herson                Officer)


/s/ R. Michael Momboisse        Chief Financial Officer, Vice                 March 25, 1999
- - ------------------------        President-Legal and Secretary 
R. Michael Momboisse            (Principal Financialand Accounting Officer)


/s/ Richard A. Peluso           Vice President and Director                   March 25, 1999
- - ------------------------
Richard A. Peluso


/s/ Franklin J. Agardy          Director                                      March 25, 1999
- - ------------------------
Franklin J. Agardy


/s/ Donald R. Kerstetter        Director                                      March 25, 1999
- - ------------------------
Donald R. Kerstetter

/s/ Peter Vardy                 Director                                      March 25, 1999
- - ------------------------
Peter Vardy
</TABLE>



                                       45
<PAGE>


                                   SCHEDULE II

                                      EMCON
                        VALUATION AND QUALIFYING ACCOUNTS

                                 (In Thousands)


<TABLE>
<CAPTION>

                                                               Additions
                                                              Charged to
                                           Balance             Costs and                         Balance
                                         at Beginning         Expenses or                        at End
                                          of Period            Bonuses        Write-Offs       of Period
                                         ------------         -----------     ----------       ---------  
<S>                                        <C>                 <C>               <C>             <C>    
Allowance for
Doubtful Accounts:

Year Ended
December 31, 1996                          $ 1,052             $1,985            $(2,086)        $   951

Year Ended
December 31, 1997                          $   951             $1,295            $(1,317)        $   929

Year Ended
December 31, 1998                          $   929             $1,349            $  (740)        $ 1,538

</TABLE>



                                       46
<PAGE>


                                INDEX TO EXHIBITS
                                                                    Sequentially
   Exhibit                                                            Numbered
   Number                                                               Page
- - --------------                                                      ------------

     2.1            Stock Purchase  Agreement  dated January             *
                    30,   1996,    among    Organic    Waste
                    Technologies,  Inc. ("OWT"),  Registrant
                    and the selling  shareholders and option
                    holders   of   OWT,    incorporated   by
                    reference   from   Exhibit  2.1  of  the
                    Current  Report on Form 8-K dated  March
                    14, 1996, (the "March 1996 8-K").

     2.2            Asset  Purchase  Agreement  between Yolo             *
                    Energy Partners, Inc., Yolo Landfill Gas
                    Corporation,  EMCON,  Yolo Neo LLC,  and
                    Minnesota Methane LLC dated December 31,
                    1996,  incorporated  by  reference  from
                    Exhibit  10.20 of the  Annual  Report on
                    Form  10-K  for the  fiscal  year  ended
                    December 31, 1996 (the "1996 10-K").

     2.3            Acquisition  Agreement between EMCON and             *
                    its wholly  owned  subsidiary,  Monterey
                    Landfill  Gas  Corporation,  and Biomass
                    Energy Partners V, L.P.,  dated March 6,
                    1997,  incorporated  by  reference  from
                    Exhibit 10.22 of the 1996 10-K.

     2.4            Stock Purchase  Agreement dated April 4,             *
                    1997    among    Registrant,    Columbia
                    Analytical   Services,   Inc.   (`CAS"),
                    Northwest  Trust as  trustee  of the CAS
                    Employee  Stock   Ownership   Trust  and
                    certain senior  management  employees of
                    CAS,   incorporated  by  reference  from
                    Exhibit   2.4   of   the    Registrant's
                    Quarterly  Report  on Form  10-Q for the
                    fiscal quarter ended March 31, 1997 (the
                    "March 1997 10-Q").

     2.5            Stock Purchase Agreement dated April 30,             *
                    1997  among  Registrant,  OWT,  National
                    Earth  Products,  Inc.  ("NEP")  and the
                    selling     stockholders     of     NEP,
                    incorporated  by reference  from Exhibit
                    2.5 of the March 1997 10-Q.

     2.6            Agreement  and  Plan  of  Reorganization             *
                    among  Registrant,  Advanced  Analytical
                    Solutions,   Inc.  ("A2S")  and  certain
                    other   parties  dated  April  3,  1998,
                    incorporated  by reference  from Exhibit
                    2.6 of the Quarterly Report on Form 10-Q
                    for the fiscal  quarter  ended March 31,
                    1998 (the "March 1998 10-Q").

     2.7            Stock Purchase  Agreement dated December            52
                    4, 1998 by and among Registrant, Western
                    52 Industrial Resources Corporation, and
                    various affiliated parties.

     3.1            Articles of  Incorporation,  as amended,             *
                    incorporated  by reference  from Exhibit
                    3.1  of  the  Registrant's  Registration
                    Statement   on  Form   S-1   (File   No.
                    33-16337)  effective  September 16, 1987
                    (the "Form S-1 Registration Statement").

     3.2            Certificate  of  Amendment  of  Restated             *
                    Articles  of  Incorporation  as filed on
                    May 24, 1988,  incorporated by reference
                    from Exhibit 3.2 of the Annual Report on
                    Form  10-K  for the  fiscal  year  ended
                    December 31, 1988 (the "1988 10-K").



                             47
<PAGE>

                                                                    Sequentially
   Exhibit                                                            Numbered
   Number                    INDEX TO EXHIBITS (Continued)              Page
- - --------------                                                      ------------

     3.3            Certificate  of  Amendment  of  Restated             *
                    Articles  of  Incorporation  as filed on
                    June 4, 1991,  incorporated by reference
                    from Exhibit 4.1 of the Quarterly Report
                    on  Form  10-Q  for the  fiscal  quarter
                    ended  June 30,  1991  (the  "June  1991
                    10-Q").

     3.4            Bylaws,  as  amended,   incorporated  by             *
                    reference  from  Exhibit 4.2 of the June
                    1991 10-Q.

    10.1            EMCON 1986  Incentive  Stock Option Plan            *(1)
                    and Amendment, incorporated by reference
                    from  Exhibit  10.15  of  the  Form  S-1
                    Registration Statement.

    10.2            Form of  Agreement  pursuant  to  Salary            *(1)
                    Continuation   Plan,   incorporated   by
                    reference from Exhibit 10.17 of the Form
                    S-1 Registration Statement.

    10.3            Schedule identifying Agreements pursuant            *(1)
                    to  Salary   Continuation  Plan  between
                    Registrant   and   certain    employees,
                    incorporated  by reference  from Exhibit
                    10.3 of the  Registrant's  Annual Report
                    on Form 10-K for the  fiscal  year ended
                    December 31, 1997 (the "1997 10-K").

    10.4            Form of Indemnity  Agreement between the             *
                    Registrant and each of the  Registrant's
                    officers and directors,  incorporated by
                    reference  from  Exhibit  10.20  of  the
                    Registrant's  Annual Report on Form 10-K
                    for the fiscal year ended  December  31,
                    1988 (the "1988 10-K").

    10.5            EMCON 1988 Stock Option Plan, amended by            *(1)
                    shareholder  approval  on  May 25, 1994,
                    including  form  of  Nonqualified  Stock
                    Option  Agreement  (Outside  Directors),
                    incorporated  by reference  from Exhibit
                    10.9 of Registrant's Quarterly Report on
                    Form 10-Q for the fiscal  quarter  ended
                    June  30,   1994  (the  "June  30,  1994
                    10-Q").

    10.6            EMCON   Employee   Stock  Purchase  Plan            *(1)
                    incorporated  by reference  from Exhibit
                    10.10  of  the  Registrant's   Quarterly
                    Report  on  Form  10-Q  for  the  fiscal
                    quarter ended June 30, 1995.

    10.7            EMCON Restricted Stock Plan incorporated            *(1)
                    by reference  from Exhibit  10.15 of the
                    Annual  Report  on  Form  10-K  for  the
                    fiscal year ended December 31, 1990.

    10.8            Trust  Agreement for the EMCON  Deferred            *(1)
                    Compensation     Plan     and     Salary
                    Continuation  Plan Trust dated  February
                    19, 1994,  between  Registrant and Wells
                    Fargo   Bank,   N.A.   incorporated   by
                    reference  from  Exhibit  10.13  of  the
                    Registrant's  Annual Report on Form 10-K
                    for the fiscal year ended  December  31,
                    1993 (the "1993 10-K").



                             48
<PAGE>

                                                                    Sequentially
   Exhibit                                                           Numbered
   Number                   INDEX TO EXHIBITS (Continued)                Page
- - --------------                                                      ------------

    10.9            Credit  Agreement  between  The  Bank of              *
                    California,  N.A. and  Registrant  dated
                    February  29,  1996,   incorporated   by
                    reference from Exhibit 10.2 of the March
                    1996 8-K.

    10.10           Security  Agreement  between The Bank of              *
                    California,  N.A. and  Registrant  dated
                    February  29,  1996,   incorporated   by
                    reference from Exhibit 10.3 of the March
                    1996 8-K.

    10.11           Pledge  Agreement  between  The  Bank of              *
                    California,  N.A. and  Registrant  dated
                    February  29,  1996,   incorporated   by
                    reference from Exhibit 10.4 of the March
                    1996 8-K.

    10.12           Eurodollar Rate Option Agreement between              *
                    The  Bank  of   California,   N.A.   and
                    Registrant   dated  February  29,  1996,
                    incorporated  by reference  from Exhibit
                    10.5 of the March 1996 8-K.

    10.13           Fixed Rate Amortization Option Agreement              *
                    between The Bank of California, N.A. and
                    Registrant   dated  February  29,  1996,
                    incorporated  by reference  from Exhibit
                    10.6 of the March 1996 8-K.

    10.14           Note  Agreement  among  the  Registrant,              *
                    OWT,  and  certain   employees  of  OWT,
                    incorporated  by reference  from Exhibit
                    10.1 of the March 1996 8-K.

    10.15           Rescission  and  Reformation   Agreement              *
                    dated  effective  November 1, 1996 among
                    EMCON,  OWT,  and certain  employees  of
                    OWT,   incorporated  by  reference  from
                    Exhibit 10.18 of the 1996 10-K.

    10.16           New  Note  Agreement   dated   effective              *
                    November  1, 1996 among  EMCON,  OWT and
                    certain * employees of OWT, incorporated
                    by reference  from Exhibit  10.19 of the
                    1996 10-K.

    10.17           Second  Amendment  to  Credit  Agreement              *
                    dated  effective  January 27, 1997 among
                    EMCON and Union Bank of California, N.A.
                    (formerly   known   as   The   Bank   of
                    California,   N.A.),   incorporated   by
                    reference from Exhibit 10.21 of the 1996
                    10-K.

    10.18           Third  Amendment  to  Credit   Agreement              *
                    dated  effective  March 27,  1997  among
                    EMCON and Union Bank of California, N.A.
                    (formerly   known   as   The   Bank   of
                    California,   N.A.),   incorporated   by
                    reference from Exhibit 10.23 of the 1996
                    10-K.

    10.19           Convertible  Notes  dated April 30, 1997              *
                    issued  by EMCON  to  Dennis  Grimm  and
                    Charles   Gearhart   in  the   principal
                    amounts of $400,798.40 and  $399,201.60,
                    respectively,  incorporated by reference
                    from  Exhibit  10.22 of the  March  1997
                    10-Q.


                             49
<PAGE>


                                                                    Sequentially
   Exhibit                                                            Numbered
   Number                INDEX TO EXHIBITS (Continued)                   Page
- - --------------                                                      ------------

    10.20           Lease  Agreement  dated  April 4,  1997,              *
                    between  EMCON and  Columbia  Analytical
                    Services,    Inc.,    incorporated    by
                    reference  from  Exhibit  10.23  of  the
                    March 1997 10-Q.

    10.21           Amendment   1997-I  to  EMCON   Deferred             *(1)
                    Compensation    Plan   dated   effective
                    February  22,  1997,   incorporated   by
                    reference  from  Exhibit  10.24  of  the
                    Registrant's  Quarterly  Report  on Form
                    10-Q for the fiscal  quarter  ended June
                    30, 1997 (the "June 30, 1997 10-Q").

    10.22           Fourth  Amendment  to  Credit  Agreement              *
                    dated  effective  June  24,  1997  among
                    EMCON  and  Union  Bank  of  California,
                    N.A.,  incorporated  by  reference  from
                    Exhibit 10.25 of the June 30, 1997 10-Q.

    10.23           Amended and Restated  Agreement  between             *(1)
                    Eugene M.  Herson and  Registrant  dated
                    November   3,  1997,   incorporated   by
                    reference from Exhibit 10.26 of the 1997
                    10-K.

    10.24           Amended and Restated  Agreement  between             *(1)
                    R.  Michael   Momboisse  and  Registrant
                    dated November 3, 1997,  incorporated by
                    reference from Exhibit 10.27 of the 1997
                    10-K.

    10.25           Deferred  Compensation Plan, Amended and             *(1)
                    Restated   effective  January  1,  1998,
                    incorporated  by reference  from Exhibit
                    10.28 of the 1997 10-K.

    10.26           Registration   Rights   Agreement  among              *
                    Registrant,  and the former shareholders
                    of A2S dated April 3, 1998, incorporated
                    by reference  from Exhibit  10.29 of the
                    March 1998 10-Q.

    10.27           Secured  Promissory  Note of  Timothy M.              *
                    Keaten  dated  April  3,  1998,  in  the
                    principal     amount    of     $225,000,
                    incorporated  by reference  from Exhibit
                    10.30 of the March 1998 10-Q.

    10.28           EMCON  1998  Stock  Option  Plan,   with             *(1)
                    standard form of Incentive  Stock Option
                    *(1)  Agreement,   Non-Statutory   Stock
                    Option Agreement and Non-Statutory Stock
                    Option   Agreement   (outside   Director
                    Option)   attached,    incorporated   by
                    reference  from  Exhibit  10.31  of  the
                    Registrant's  Quarterly  Report  on Form
                    10-Q for the fiscal  quarter  ended June
                    30, 1998 (the "June 30, 1998 10-Q").

    10.29           Sixth  Amendment  to  Credit   Agreement              *
                    among   Registrant  and  Union  Bank  of
                    California    dated    June   1,   1998,
                    incorporated  by reference  from Exhibit
                    10.32 of the June 30, 1998 10-Q.



                             50
<PAGE>

                                                                    Sequentially
   Exhibit                                                            Numbered
   Number               INDEX TO EXHIBITS (Continued)                   Page
- - --------------                                                      ------------

    10.30           Seventh  Amendment  to Credit  Agreement              *
                    among   Registrant  and  Union  Bank  of
                    California   dated   August  31,   1998,
                    incorporated  by reference  from Exhibit
                    10.33 of the September 30, 1998 10-Q.

    10.31           Employment  Agreement between Registrant             77(1)
                    and Patrick Gillespie dated November 10,
                    1998.

    10.32           Employment  Agreement between Registrant             80(1)
                    and Gerard  Ridzon  dated  November  10,
                    1998.

    10.33           Amendment   1998-1  to  EMCON   Deferred             83(1)
                    Compensation  Plan  dated  November  12,
                    1998.

    10.34           Eighth  Amendment  to  Credit  Agreement              84
                    among   Registrant  and  Union  Bank  of
                    California dated November 30, 1998.

    10.35           Ninth  Amendment  to  Credit   Agreement              89
                    among   Registrant  and  Union  Bank  of
                    California dated December 22, 1998.

    10.36           Tenth  Amendment  to  Credit   Agreement              94
                    among   Registrant  and  Union  Bank  of
                    California dated January 27, 1999.

    10.37           Extension  and  Modification   Agreement              99
                    between the Union Bank of California and
                    Registrant dated March 19, 1999.

    23.1            Consent   of   Ernst   &   Young,   LLP,             112
                    Independent Auditors

     27             Financial   Data   Schedule,    included             113
                    herein.

 *  Incorporated by reference
(1)  Management  contract or  compensatory  plan or  arrangement  required to be
     filed as an exhibit to this form pursuant to Item 14(c) of the instructions
     to Form 10-K.



                             51




                                   EXHIBIT 2.7





                            STOCK PURCHASE AGREEMENT

                                  BY AND AMONG
                    WESTERN INDUSTRIAL RESOURCES CORPORATION,
                             AN ARIZONA CORPORATION,
                        ORGANIC WASTE TECHNOLOGIES, INC.,
                             A DELAWARE CORPORATION,
                           BRUCE NAVE AND MARCIA NAVE,
                 AND, WITH RESPECT TO SECTIONS 6.4, 6.8 and 8.5,
                         EMCON, A CALIFORNIA CORPORATION








                                       52
<PAGE>

                      TABLE OF CONTENTS
                                                                           Page

1.    Definitions ......................................................     55
      1.1         Affiliate ............................................     55
      1.2         Cash Consideration ...................................     55
      1.4         Closing Date .........................................     55
      1.5         Commission ...........................................     55
      1.6         "GAAP" ...............................................     55
      1.7         Governmental Entity ..................................     55
      1.8         Holder Knowledge .....................................     55
      1.9         Material Adverse Effect ..............................     55
      1.10        "Purchase" ...........................................     55
      1.11        Securities Act .......................................     55

2.    Purchase and Sale ................................................     56
      2.1         Purchase and Sale ....................................     56
      2.2         Aggregate Consideration ..............................     56
      2.3         Closing; Delivery ....................................     56

3.    Representations and Warranties of WI and the Sellers .............     56
      3.1         Organization, Standing and Power .....................     56
      3.2         Authority ............................................     57
      3.3         Title to Property ....................................     57
      3.4         Capital Structure ....................................     57
      3.5         Financial Statements .................................     58
      3.6         Absence of Certain Changes ...........................     58
      3.7         Absence of Undisclosed Liabilities ...................     58
      3.8         Governmental Authorization ...........................     58
      3.9         Litigation ...........................................     58
      3.10        Restrictions on Business Activities ..................     58
      3.11        Intellectual Property ................................     59
      3.12        Interested Party Transactions ........................     59
      3.13        Minute Books .........................................     59
      3.14        Complete Copies of Materials .........................     59
      3.15        Material Contracts ...................................     59
      3.16        Accounts Receivable ..................................     59
      3.17        Customers and Suppliers ..............................     60
      3.18        Employees and Consultants ............................     60
      3.19        Environmental Matters ................................     60
      3.20        Taxes ................................................     60
      3.21        Employee Benefit Plans ...............................     62
      3.22        Employee Matters .....................................     63
      3.23        Insurance ............................................     63
      3.24        Compliance With Laws .................................     63
      3.25        Ownership of Shares and Options ......................     63
      3.26        Information Supplied .................................     64
      3.27        Brokers or Finders ...................................     64
      3.28        Representations Complete .............................     64

4.    Representations and Warrantees of EMCON ..........................     64
      4.1         Organization, Standing and Power .....................     64
      4.2         Authority ............................................     64

5.    Preclosing Covenants of WI .......................................     64
      5.1         Conduct of Business of WI ............................     64
      5.2         Access to Information ................................     66
      5.3         Exclusivity ..........................................     66



                             53
<PAGE>

                      TABLE OF CONTENTS
                                                                            Page

6.    Mutual Covenants .................................................     66

      6.1         No Public Announcement ...............................     66
      6.2         Consents; Cooperation ................................     67
      6.3         Legal Requirements ...................................     67
      6.4         Confidentiality ......................................     67
      6.5         Public Disclosure ....................................     67
      6.6         Further Assurances ...................................     67
      6.7         Expenses .............................................     67

7.    Conditions to Each Party's Obligations ...........................     67
      7.1         No Injunctions or Restraints; Illegality .............     67
      7.2         Governmental Approval ................................     68

8.    Conditions to the Sellers' Obligations ...........................     68
      8.1         Accuracy of Representations and Warranties ...........     68
      8.2         Covenants and Conditions .............................     68
      8.3         Employment and Non-Competition Agreements ............     68
      8.4         Documents ............................................     68
      8.5         Release of Personal Guaranty .........................     68

9.    Conditions to Emcon's Obligations ................................     68
      9.1         Accuracy of Representations and Warranties ...........     68
      9.2         Covenants and Conditions .............................     68
      9.3         Certificate of Secretary .............................     68
      9.4         No Material Adverse Change ...........................     68
      9.5         Repayment and Cancellation of Promissory Note ........     68
      9.6         Third Party Consents .................................     68
      9.7         Employment and Non-Competition Agreements ............     69
      9.8         Delivery of Stock Certificates .......................     69
      9.9         Opinion of Counsel ...................................     69
      9.10        Termination of Employment Contracts ..................     69
      9.11        Documents ............................................     69

10.   Termination ......................................................     69
      10.1        Termination ..........................................     69
      10.2        Effect of Termination ................................     69
      10.3        Extension; Waiver ....................................     69
      10.4        Obligations Following Termination ....................     70

11.   Miscellaneous ....................................................     70
      11.1        Governing Law ........................................     70
      11.2        Notices ..............................................     70
      11.3        Binding Upon Successors and Assigns ..................     72
      11.4        Severability..........................................     72
      11.5        Remedies Cumulative ..................................     72
      11.6        Entire Agreement .....................................     72
      11.7        Counterparts .........................................     72
      11.8        Amendment and Waivers ................................     72
      11.9        Survival of Agreements ...............................     72
      11.10       Construction of Agreement ............................     72
      11.11       Absence of Third Party Beneficiary Rights ............     72



                             54
<PAGE>

                            STOCK PURCHASE AGREEMENT


         THIS STOCK PURCHASE  AGREEMENT (the "Agreement") is effective as of the
4th  day  of  December,   1998,  by  and  among  Western  Industrial   Resources
Corporation, an Arizona corporation ("WI"), Organic Waste Technologies,  Inc., a
Delaware  corporation  ("OWT"),  Bruce Nave and Marcia Nave  (collectively,  the
"Sellers"  and each a "Seller")  and, with respect to Sections 6.4, 6.8 and 8.5,
EMCON, a California Corporation ("EMCON").

                                    RECITALS


          A. The Sellers are the owners of all of the outstanding  capital stock
of WI (the "WI Shares") prior to the Closing Date (as defined below).


          B. OWT wishes to acquire  the WI Shares in exchange  for certain  cash
payments  pursuant to the terms of this Agreement and each of the Sellers wishes
to sell all WI  Shares  which  he,  she or it holds as of the  Closing  Date (as
defined below) to OWT pursuant to the terms of this Agreement (the "Purchase").


          C. The parties  hereto  desire to set forth  certain  representations,
warranties  and  covenants  made by each of the  other as an  inducement  to the
consummation of the Purchase.

                                    AGREEMENT

         NOW,  THEREFORE,  in reliance on the foregoing  recitals and in and for
the  consideration  and mutual covenants set forth herein,  the parties agree as
follows:

         1.       Definitions.

                  1.1 "Affiliate"  shall have the meaning set forth in the rules
and regulations promulgated by the Commission pursuant to the Securities Act.

                  1.2 "Cash  Consideration"  shall mean the amount to be paid to
the Sellers under Sections 2.2(a) and (b), subject to Section 2.2(c).

                  1.3 "Closing"  shall have the meaning set forth in Section 2.3
hereof.

                  1.4 "Closing Date" shall have the meaning set forth in Section
2.3 hereof.

                  1.5 "Commission"  shall mean the United States  Securities and
Exchange Commission.

                  1.6  "GAAP"   shall   mean   generally   accepted   accounting
principals.

                  1.7  "Governmental   Entity"  means  any  (i)  nation,  state,
commonwealth,  province,  territory,  county,  municipality,  district  or other
jurisdiction of any nature; (ii) federal,  state, local,  municipal,  foreign or
other government;  or (iii) governmental or quasi-governmental  authority of any
nature (including any governmental  division,  department,  agency,  commission,
official, organization, and any court or other tribunal).

                  1.8 "Knowledge"  means any reference to a party's  "knowledge"
means such  party's  actual  knowledge  after  reasonable  inquiry of  officers,
directors  and  other  employees  of  such  party  reasonably  believed  to have
knowledge of such matters.

                  1.9 "Material Adverse Effect" means any reference with respect
to any entity or group of entities to a material adverse effect on the business,
assets  (including  intangible  assets),   financial  condition  or  results  of
operations  of such entity,  taken as a whole.  When the word  "material" is not
capitalized it shall mean material with respect to the matter referenced.

                  1.10  "Purchase"  shall mean the  purchase  and sale of the WI
shares as described in Section 2.1 hereof.

                  1.11  "Securities  Act" shall mean the Securities Act of 1933,
as  amended,  or any  similar  federal  statute  and the rules  and  regulations
thereunder, all as the same shall be in effect at the time.




                                       55
<PAGE>
         2.       Purchase and Sale.

                  2.1 Purchase and Sale. At the Closing,  the Sellers shall sell
to  OWT,  and OWT  shall  purchase  from  the  Sellers,  all of the  issued  and
outstanding WI Shares for the Cash Consideration described below.

                  2.2 Cash Consideration.

                      (a) The initial  purchase price for the WI Shares shall be
One Hundred Eighty Nine Thousand Dollars ($189,000),  of which One Hundred Fifty
Nine  Thousand  Dollars  ($159,000)  shall be paid to the Sellers at the Closing
(the "Initial  Payment") and Thirty Thousand Dollars ($30,000) shall be withheld
pursuant to Section 2.2(c) hereof for payment of the Outstanding Tax Liabilities
(as defined  below).  The Initial  Payment  will be allocated to each Seller pro
rata based on the number of WI Shares being sold to OWT by such Seller.

                      (b) In addition to the Initial  Payment,  the Sellers will
be eligible to earn additional consideration,  regardless of the either Sellers'
employment status with the Company, based on the performance of WI subsequent to
the  Closing,  as  described  on Exhibit A attached  hereto  (each an  "Earn-out
Payment").  Each Earn-out Payment paid to Sellers,  if any, will be allocated to
each  Seller  pro rata  based on the  number  of WI  Shares  sold to OWT by such
Seller.

                      (c) OWT shall withhold Thirty Thousand  Dollars  ($30,000)
from the Initial  Consideration  for payment to applicable  tax  authorities  of
interest  and  penalties  paid or  payable  after  September  21,  1998  and any
undisclosed taxes as of the Closing (the "Outstanding Tax Liabilities").  In the
event the  Outstanding  Tax  Liabilities  are less than  $30,000 as of March 31,
1999, the amount of the shortfall shall be paid as soon as practicable by OWT to
the  Sellers  pro rata  based on the  number  of WI  Shares  sold to OWT by such
Seller. In the event the Outstanding Tax Liabilities are greater than $30,000 as
of March 31, 1999,  the amount of the excess (the "Excess  Liability")  shall be
paid as soon as practicable to OWT by Sellers pro rata based on the number of WI
Shares sold to OWT by such Seller; provided,  however, that any Excess Liability
owed that is not  assessed at March 31,  1999 or that is unpaid by the  Sellers,
shall be deducted from the first Earn-out Payment and, to the extent  necessary,
from each subsequent  Earn-out  Payment to the extent such  subsequent  Earn-out
Payments are sufficient to offset the Excess Liability.

                  2.3  Closing;  Delivery.  The  closing  of the  Purchase  (the
"Closing")  shall take place at the offices of Gray Cary Ware & Freidenrich LLP,
400 Hamilton  Avenue,  Palo Alto,  California at 10:00 a.m., on December 4, 1998
(the  "Closing  Date"),  or at such other time and place as OWT and the  Sellers
shall  mutually  agree.  At  the  Closing,  each  Seller  shall  deliver  to OWT
certificate(s)  representing  the WI Shares  that the  Seller is  selling,  duly
endorsed or with assignments separate from certificate,  against delivery to the
Seller  by OWT of a check  in the  amount  of the  Initial  Payment  due to such
Seller.

          3.  Representations  and  Warranties of WI and the Sellers.  Except as
disclosed in a document of even date  herewith and  delivered by WI to OWT prior
to  the  execution  and  delivery  of  this   Agreement  and  referring  to  the
representations and warranties in this Agreement (the "WI Disclosure Schedule"),
each of the  Sellers and WI,  represents  and  warrants  to OWT as follows  (any
representation or warranty of WI herein being deemed to be a representation  and
warranty of each Seller):

                  3.1 Organization, Standing and Power. WI is a corporation duly
organized,  validly existing and in good standing under the laws of the State of
Arizona.  WI has the corporate  power to own its  properties and to carry on its
business as now being  conducted and is duly  qualified to do business and is in
good standing in each  jurisdiction  in which the failure to be so qualified and
in good standing would have a Material Adverse Effect on WI. WI has delivered to
OWT a true and correct  copy of the Articles of  Incorporation  and Bylaws of WI
each as amended to date. WI is not in violation of any of the  provisions of its
Articles of Incorporation or Bylaws.  WI does not directly or indirectly own any
equity or similar  interest in, or any interest  convertible or  exchangeable or
exercisable   for,  any  equity  or  similar   interest  in,  any   corporation,
partnership, joint venture or other business association or entity.

                  3.2 Authority.

                      (a) WI has,  and will  have as of the  Closing  Date,  all
requisite  corporate  power and  authority to enter into this  Agreement  and to
consummate the transactions  contemplated  hereby. The execution and delivery of
this  Agreement  has,  and  as of  the  Closing  Date  the  consummation  of the
transactions  contemplated  hereby  will  have  been,  duly  authorized  by  all
necessary  corporate  action  on the part of WI.  This  Agreement  has been duly
executed and delivered by WI and constitutes the valid and binding obligation of
WI  enforceable  against  WI in  accordance  with  its  terms,  except  as  such
enforceability  may be limited by  bankruptcy,  insolvency,  moratorium or other
similar  laws  affecting  or relating to  creditors'  rights  generally,  and is
subject to general  principles  of equity.  The  execution  and delivery of this
Agreement by WI does not, and the consummation of the transactions  contemplated
hereby will not,  conflict with, or result in any violation of, or default under
(with or without  notice or lapse of time, or both),  or give rise to a right of
termination, cancellation or acceleration of any

                                       56
<PAGE>


material  obligation or loss of any material  benefit under (i) any provision of
the Articles of  Incorporation  or Bylaws of WI, or (ii) any material  mortgage,
indenture, lease, contract or other agreement or instrument, permit, concession,
franchise,  license,  judgment,  order, decree, statute, law, ordinance, rule or
regulation  applicable  to WI or any of its  properties  or assets.  No consent,
approval,  order or  authorization  of, or  registration,  declaration or filing
with, any Governmental Entity is required by or with respect to WI in connection
with the execution  and delivery of this  Agreement or the  consummation  of the
transactions  contemplated  hereby,  except for such  consents,  authorizations,
filings,  approvals and registrations  which, if not obtained or made, would not
have a Material Adverse Effect on WI and would not prevent,  or materially alter
or delay any of the transactions contemplated by this Agreement.

                      (b) Each Seller has, and will have as of the Closing Date,
all requisite power and authority to enter into this Agreement and to consummate
the  transactions  contemplated  hereby.  The  execution  and  delivery  of this
Agreement has, and as of the Closing Date the  consummation of the  transactions
contemplated  hereby will have been, duly authorized by all necessary  action on
the part of each Seller, to the extent  necessary.  This Agreement has been duly
executed  and  delivered  by  Seller  and  constitutes  the  valid  and  binding
obligation of Seller  enforceable  against Seller in accordance  with its terms,
except  as  such  enforceability  may  be  limited  by  bankruptcy,  insolvency,
moratorium  or other  similar laws  affecting or relating to  creditors'  rights
generally,  and is subject to general principles of equity. Any other agreements
or documents  required  hereunder to be executed and delivered by each Seller at
Closing will constitute the legal,  valid and binding  agreements of each Seller
executing the same,  enforceable  against such Seller in  accordance  with their
respective terms, except as enforcement may be limited by applicable bankruptcy,
insolvency,  reorganization,  fraudulent  conveyance,  moratorium  or other laws
affecting  creditor's  rights  generally.  The  execution  and  delivery of this
Agreement  by  Seller  does  not,  and  the  consummation  of  the  transactions
contemplated  hereby will not,  conflict with, or result in any violation of, or
default under (with or without  notice or lapse of time, or both),  or give rise
to a  right  of  termination,  cancellation  or  acceleration  of  any  material
obligation  or  loss  of any  material  benefit  under  any  material  mortgage,
indenture, lease, contract or other agreement or instrument, permit, concession,
franchise,  license,  judgment,  order, decree, statute, law, ordinance, rule or
regulation  applicable  to Seller or any of Seller's  properties  or assets.  No
consent,  approval,  order or authorization of, or registration,  declaration or
filing with, any Governmental Entity is required by or with respect to Seller in
connection with the execution and delivery of this Agreement or the consummation
of  the   transactions   contemplated   hereby,   except   for  such   consents,
authorizations,  filings,  approvals and registrations which, if not obtained or
made,  would not have a Material Adverse Effect on Seller and would not prevent,
or  materially  alter  or delay  any of the  transactions  contemplated  by this
Agreement.

                  3.3 Title to Property. WI has good and marketable title to all
of its  properties,  interests  in  properties  and assets,  real and  personal,
reflected in the WI Balance  Sheet or acquired  after the WI Balance  Sheet Date
(except  properties,  interests  in  properties  and  assets  sold or  otherwise
disposed of since the WI Balance Sheet Date in the ordinary course of business),
and with respect to leased  properties  and assets,  valid  leasehold  interests
therein,  free  and  clear  of  all  mortgages,   liens,  pledges,   charges  or
encumbrances of any kind or character,  except (i) the lien of current taxes not
yet due and payable, (ii) such imperfections of title, liens and easements as do
not and  will  not  materially  detract  from or  interfere  with the use of the
properties subject thereto or affected thereby,  or otherwise  materially impair
business  operations  involving  such  properties  and (iii) liens securing debt
which is reflected  on the WI Balance  Sheet.  The property and  equipment of WI
that are used in the operations of its  businesses are in all material  respects
in good  operating  condition and repair,  subject to normal wear and tear.  All
material properties used in the operations of WI are reflected in the WI Balance
Sheet to the extent GAAP require the same to be  reflected.  All leases to which
WI is a  party  are in  full  force  and  effect  and  are  valid,  binding  and
enforceable  in  accordance  with  their  respective   terms,   except  as  such
enforceability  may be limited by (i)  bankruptcy  laws and other  similar  laws
affecting  creditors'  rights  generally and (ii) general  principles of equity,
regardless  of whether  asserted in a proceeding  in equity or at law.  True and
correct  copies of all such  leases  have been  provided to OWT. WI owns no real
property.

                  3.4 Capital Structure.

                      (a) The authorized capital stock of WI consists of 100,000
shares of  Common  Stock.  As of the  Closing  Date,  there  will be issued  and
outstanding  100,000 shares of Common Stock.  All  outstanding  shares of Common
Stock of WI are duly authorized,  validly issued,  fully paid and non-assessable
and are free of any liens or  encumbrances  other than any liens or encumbrances
created  by or  imposed  upon  the  holders  thereof,  and  are not  subject  to
preemptive rights or rights of first refusal created by statute, the Articles of
Incorporation  or  Bylaws  of WI or any  agreement  to which WI is a party or by
which it is bound.


                                       57
<PAGE>
                      (b)  Except  for  the  rights  created  pursuant  to  this
Agreement,  there are no other options,  warrants, calls, rights, commitments or
agreements  of any  character  to  which  WI is a party  or by which it is bound
obligating  WI to  issue,  deliver,  sell,  repurchase  or redeem or cause to be
issued, delivered, sold, repurchased or redeemed, any shares of Capital Stock of
WI or  obligating  WI to grant,  extend,  accelerate  the vesting of, change the
price of, or  otherwise  amend or enter  into any such  option,  warrant,  call,
right,  commitment or agreement.  There are no other  contracts,  commitments or
agreements  relating  to  voting,  purchase  or sale of WI's  capital  stock (i)
between  or among  WI and any of its  shareholders  and (ii) to WI's  knowledge,
between  or among any of WI's  shareholders.  All shares of  outstanding  Common
Stock of WI were  issued in  compliance  with all  applicable  federal and state
securities laws.

                  3.5  Financial  Statements.   WI  has  delivered  to  OWT  its
unaudited financial  statements for the fiscal year ended December 31, 1997, and
for the nine-month period ended September 30, 1998 (collectively, the "Financial
Statements").  The Financial  Statements  have been prepared in accordance  with
GAAP (except that the Financial  Statements do not contain footnotes) applied on
a consistent  basis  throughout the periods  indicated and with each other.  The
Financial  Statements  fairly  present the  financial  condition  and  operating
results of WI as of the dates, and for the periods,  indicated therein,  subject
to normal end of period adjustments.  WI maintains and will continue to maintain
a standard system of accounting  established and administered in accordance with
GAAP.

                  3.6 Absence of Certain Changes.  Since September 30, 1998 (the
"WI Balance Sheet Date"),  WI has conducted its business in the ordinary  course
consistent with past practice, and there has not occurred: (i) any change, event
or  condition  (whether or not covered by  insurance)  that has  resulted in, or
might reasonably be expected to result in, a Material Adverse Effect on WI; (ii)
any acquisition,  sale or transfer of any material asset of WI other than in the
ordinary course of business and consistent with past practice;  (iii) any change
in accounting  methods or practices  (including  any change in  depreciation  or
amortization  policies  or rates) by WI or any  revaluation  by WI of any of its
assets;  (iv) any declaration,  setting aside, or payment of a dividend or other
distribution  with  respect  to the  shares  of WI or  any  direct  or  indirect
redemption,  purchase or other acquisition by WI of any of its shares of capital
stock; (v) any material  contract entered into by WI, other than in the ordinary
course  of  business  and as  provided  to OWT,  or any  material  amendment  or
termination of, or default under,  any material  contract to which WI is a party
or by which it is  bound;  (vi) any  amendment  or  change  to the  Articles  of
Incorporation  or Bylaws of WI;  (vii) any  increase in or  modification  of the
compensation  or  benefits  payable  or to  become  payable  by WI to any of its
directors or employees;  or (viii) any  negotiation or agreement by WI to do any
of the things  described in the preceding  clauses (i) through (vii) (other than
negotiations  with  OWT  and  its  representatives  regarding  the  transactions
contemplated by this Agreement). At the Effective Time, there will be no accrued
but unpaid dividends on shares of WI's capital stock.

                  3.7  Absence of  Undisclosed  Liabilities.  WI has no material
obligations  or  liabilities  of any  nature  (matured  or  unmatured,  fixed or
contingent)  other than (i) those set forth or  adequately  provided  for in the
Balance Sheet for the period ended September 30, 1998 (the "WI Balance  Sheet"),
(ii) those  incurred in the  ordinary  course of business and not required to be
set forth in the WI Balance  Sheet  under  GAAP,  (iii)  those  incurred  in the
ordinary  course of business since the WI Balance Sheet Date and consistent with
past practice;  and (iv) those incurred in connection with the execution of this
Agreement.

                  3.8 Governmental Authorization.  WI has obtained each federal,
state, county, local or foreign governmental consent, license, permit, grant, or
other  authorization of a Governmental Entity (i) pursuant to which WI currently
operates or holds any interest in any of its properties or (ii) that is required
for the operation of WI's business or the holding of any such interest,  and all
of such  authorizations are in full force and effect except where the failure to
obtain or have any such authorizations  could not reasonably be expected to have
a Material Adverse Effect on WI.

                  3.9 Litigation.  There is no private or  governmental  action,
suit, proceeding, claim, arbitration or investigation pending before any agency,
court or tribunal,  foreign or domestic,  or, to the knowledge of WI, threatened
against  WI or any of their  respective  properties  or any of their  respective
officers or directors (in their capacities as such) that, individually or in the
aggregate, could reasonably be expected to have a Material Adverse Effect on WI.
There is no judgment,  decree or order  against WI, or, to the  knowledge of WI,
any of their  respective  directors or officers (in their  capacities  as such),
that could prevent, enjoin, or materially alter or delay any of the transactions
contemplated by this Agreement,  or that could  reasonably be expected to have a
Material Adverse Effect on WI. All litigation to which WI is a party (or, to the
knowledge of WI, threatened to become a party) is disclosed in the WI Disclosure
Schedule.

                  3.10  Restrictions  on  Business   Activities.   There  is  no
agreement,  judgment,  injunction,  order or decree binding upon WI which has or
could  reasonably  be expected to have the effect of  prohibiting  or materially
impairing  any current or future  business  practice of WI, any  acquisition  of
property by WI or the conduct of business  by WI as  currently  conducted  or as
proposed to be conducted by WI.
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<PAGE>

                  3.11 Intellectual Property.

                      (a) WI owns or is licensed or otherwise  possesses legally
enforceable rights to use, all patents, patent applications,  trademarks,  trade
names, service marks,  copyrights (whether registered or unregistered),  and any
applications therefor, maskworks, maskwork applications,  net lists, schematics,
technology,  know-how, trade secrets, inventory,  ideas, algorithms,  processes,
computer software programs and applications (in both source code and object code
form),  client  lists and tangible or  intangible  proprietary  information  and
material  ("Intellectual  Property")  that are used or currently  proposed to be
used in the business of WI as currently conducted or as proposed to be conducted
by WI, except to the extent that the failure to have such rights has not had and
would not reasonably be expected to have a Material  Adverse Effect on WI. WI is
the exclusive owner of all Intellectual Property. WI has not licensed any of the
Intellectual Property on an exclusive basis.

                      (b) All patents, registered trademarks,  service marks and
copyrights  held  by  WI  are  valid  and  subsisting.  WI  is  not  infringing,
misappropriating  or making  unlawful use of, and has not received any notice or
other communication (in writing or otherwise) of any actual,  alleged,  possible
or potential  infringement,  misappropriation or unlawful use of any proprietary
asset  owned or used by any third  party.  WI (i) has not been sued in any suit,
action or  proceeding  which  involves a claim of  infringement  of any patents,
trademarks,  service marks, copyrights or violation of any trade secret or other
proprietary right of any third party; and (ii) has not brought any action,  suit
or proceeding for infringement of Intellectual Property or breach of any license
or agreement involving Intellectual Property against any third party.

                      (c)  All  current  and  former  officers,   employees  and
consultants of WI have executed and delivered to WI an agreement  (containing no
exceptions  or  exclusions  from  the  scope  of  its  coverage)  regarding  the
protection  of  proprietary   information  and  the  assignment  to  WI  of  any
Intellectual  Property  arising from services  performed for WI by such persons,
the form of which has been supplied to OWT.

                  3.12 Interested Party Transactions.  WI is not indebted to any
director,  officer,  employee  or agent of WI (except  for amounts due as normal
salaries and bonuses and in  reimbursement  of ordinary  expenses),  and no such
person is indebted to WI.

                  3.13 Minute  Books.  The minute books of WI made  available to
OWT contain a complete  and accurate  summary of all  meetings of directors  and
shareholders or actions by written consent since the time of incorporation of WI
through the date of this Agreement,  and reflect all transactions referred to in
such minutes accurately in all material respects.

                  3.14 Complete  Copies of  Materials.  WI has delivered or made
available true and complete  copies of each document which has been requested by
OWT or its counsel in connection with their legal and accounting review of WI.

                  3.15 Material Contracts. All material contracts and agreements
to which WI is a party are listed in the WI  Disclosure  Schedule  hereto.  With
respect to each such agreement:  (i) the agreement is legal, valid,  binding and
enforceable  and in full  force  and  effect  with  respect  to WI,  and to WI's
knowledge is legal,  valid,  binding,  enforceable  and in full force and effect
with respect to each other party  thereto,  in either case subject to the effect
of  bankruptcy,  insolvency,  moratorium  or other  similar laws  affecting  the
enforcement of creditors'  rights  generally and except as the  availability  of
equitable  remedies  may be limited by general  principles  of equity;  (ii) the
agreement will continue to be legal, valid,  binding and enforceable and in full
force and effect immediately  following the Closing in accordance with the terms
thereof as in effect prior to the Closing,  subject to the effect of bankruptcy,
insolvency,  moratorium  or other  similar laws  affecting  the  enforcement  of
creditors' rights generally and except as the availability of equitable remedies
may be limited by general principles of equity; and (iii) neither the WI nor, to
WI's  knowledge,  any other  party,  is in breach or  default,  and no event has
occurred which with notice or lapse of time would constitute a breach of default
by WI or, to WI's  knowledge,  by any such other party,  or permit  termination,
modification  or  acceleration,  under the  agreement.  WI is not a party to any
material  oral  contract,  agreement or other  arrangement  other than as may be
disclosed in the WI Disclosure Schedule.

                  3.16 Accounts Receivable. Subject to any reserves set forth in
the  Financial  Statements,  the  accounts  receivable  shown  on the  Financial
Statements  represent and will represent  bona fide claims  against  debtors for
sales and other charges, are collectible in accordance with their terms at their
recorded  amounts  and are not  subject to  discount  except for normal cash and
immaterial  trade  discounts.  The amount  carried  for  doubtful  accounts  and
allowances  disclosed in the  Financial  Statements is sufficient to provide for
any losses which may be sustained on revaluation of the receivables.


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<PAGE>

                  3.17  Customers  and  Suppliers.  As of the  date  hereof,  no
customer  which  individually  accounted for more than 5% of WI's gross revenues
during the 12 month period  preceding  the date hereof and no supplier of WI has
canceled or otherwise terminated,  or made any written threat to WI to cancel or
otherwise  terminate,  its  relationship  with WI or has at any time on or after
September 30, 1998  decreased  materially  its services or supplies to WI in the
case of any such supplier, or its usage of the services or products of WI in the
case of such customer,  and to WI's knowledge,  no such supplier or customer has
indicated either orally or in writing that it will cancel or otherwise terminate
its relationship  with WI or to decrease  materially its services or supplies to
WI or its usage of the  services  or  products of WI, as the case may be. WI has
not knowingly  breached any agreement with, or engaged in any fraudulent conduct
with respect to, any customer or supplier of WI.

                  3.18  Employees and  Consultants.  The WI Disclosure  Schedule
contains  a list of the names of all  employees  and  consultants  of WI,  their
respective  salaries or wages,  other  compensation  and dates of employment and
positions.

                  3.19 Environmental Matters.

                      (a) As used in this Agreement:

                         (i) "Environmental Laws" shall mean any federal,  state
or local laws, ordinances,  codes, regulations,  rules, policies and orders that
are intended to assure the  protection  of the  environment,  or that  classify,
regulate,  call for the  remediation  of, require  reporting with respect to, or
list or  define  air,  water,  groundwater,  solid  waste,  hazardous  or  toxic
substances, materials, wastes, pollutants or contaminants, or which are intended
to assure  the safety of  employees,  workers or other  persons,  including  the
public.

                         (ii)  "Hazardous  Materials"  shall  mean any  toxic or
hazardous  substance,  material or waste or any  pollutant  or  contaminant,  or
infectious or radioactive  substance or material,  including without limitation,
those  substances,  materials  and  wastes  defined  in or  regulated  under any
Environmental Laws.

                      (b) WI is  not  and  has  not  been  in  violation  of any
Environmental  Law relating to the  properties  or facilities of WI at which any
part of WI's  business  is or has been  conducted.  WI has not used,  generated,
manufactured  or stored on or under any part of its  properties or facilities at
which any part of WI's business is or has been  conducted,  or transported to or
from any part thereof,  any Hazardous  Materials in violation of any  applicable
Environmental Laws. There has not been any presence, disposal, or release of any
Hazardous  Materials on, from or under any part of WI's properties or facilities
at which any part of WI's business is or has been conducted.  No civil, criminal
or  administrative  action,  proceeding or  investigation is pending or, to WI's
knowledge,  threatened  against  WI,  and  WI is  not  aware  of  any  facts  or
circumstances  which could form the basis for assertion of a claim or liability,
regarding non-compliance with Environmental Laws relating to WI's business.

                  3.20 Taxes.

                      (a)  For   purposes  of  this   Agreement,   a  "Tax"  or,
collectively, "Taxes" means any and all federal, state, local and foreign taxes,
assessments  and other similar  governmental  charges,  duties and  impositions,
including  taxes  based upon or  measured by gross  receipts,  income,  profits,
sales,  use and occupation,  and value added, ad valorem,  transfer,  franchise,
withholding, payroll, recapture, employment, excise and property taxes, together
with all interest,  penalties and additions imposed with respect to such amounts
and any obligations  under any agreements or arrangements  with any other person
with  respect  to such  amounts  and  including  any  liability  for  taxes of a
predecessor entity.

                      (b)  Each  of  the  Company  and  its  Subsidiaries   have
accurately prepared and timely filed (or will so file) all federal, state, local
and foreign returns,  estimates,  information statements and reports relating to
any and all  Taxes  concerning  or  attributable  to the  Company  or any of its
Subsidiaries  or to  their  operations  ("Returns")  required  to be filed at or
before the Closing  Date,  and such Returns are true and correct in all material
respects and have been  completed in all material  respects in  accordance  with
applicable  law. Each of the Company and its  Subsidiaries  has disclosed on its
federal income Tax returns all positions taken therein that could give rise to a
substantial  understatement  of federal income tax within the meaning of Section
6662 of the Code.

                      (c) Each of the  Company  and its  Subsidiaries  as of the
Closing  Date:  (i) will have paid all Taxes it is  required to pay prior to the
Closing  Date and (ii) will have  withheld  with  respect to its  employees  all
federal  and state  income  taxes,  FICA,  FUTA and other  Taxes  required to be
withheld,  except for Taxes  contested in good faith by appropriate  proceedings
for which adequate reserves have been taken.



                                       60
<PAGE>


                      (d) There is no Tax  deficiency  outstanding,  proposed or
assessed against the Company or any of its Subsidiaries that is not reflected as
a  liability  on the  Company  Balance  Sheet nor has the  Company or any of its
Subsidiaries  executed any waiver of any statute of  limitations on or extending
the period for the assessment or collection of any Tax.

                      (e) Neither the  Company nor any of its  Subsidiaries  has
any liability  for unpaid  federal,  state,  local or foreign Taxes that has not
been accrued for or reserved on the Company Balance Sheet,  whether  asserted or
unasserted, contingent or otherwise.

                      (f) No audit or other  examination  of any  Return  of the
Company or any of its Subsidiaries is presently in progress, nor has the Company
or any of its  Subsidiaries  been  notified  of any request for such an audit or
other examination.

                      (g) The Company has made  available  to Buyer or its legal
counsel copies of all foreign,  federal and state income and all state sales and
use Returns for the Company and all its Subsidiaries filed for all periods since
their respective inceptions.

                      (h) There are (and immediately  following the Closing Date
there will be) no liens,  pledges,  charges,  claims,  restrictions on transfer,
mortgages,  security interests or other encumbrances of any sort  (collectively,
"Liens") on the assets of the Company nor any of its Subsidiaries relating to or
attributable to Taxes other than Liens for Taxes not yet due and payable.

                      (i) Neither the  Company nor any of its  Subsidiaries  has
knowledge of any basis for the assertion of any claim  relating or  attributable
to Taxes which, if adversely determined,  would result in any Lien on the assets
of the Company or any of its Subsidiaries.

                      (j)  None  of  the  assets  of the  Company  of any of its
Subsidiaries  are treated as  "tax-exempt  use  property"  within the meaning of
Section 168(h) of the Code.

                      (k)  As of  the  Closing  Date,  there  will  not  be  any
contract,  agreement,  plan or  arrangement,  including  but not  limited to the
provisions of this  Agreement,  covering any employee or former  employee of the
Company or any of its Subsidiaries  that,  individually or  collectively,  could
give rise to the  payment of any  amount  that  would not be  deductible  by the
Company or any of its Subsidiaries as an expense under applicable law.

                      (l) Neither the  Company nor any of its  Subsidiaries  has
filed any consent  agreement  under Section 341(f) of the Code or agreed to have
Section 341(f)(4) of the Code apply to any disposition of a subsection (f) asset
(as defined in Section 341(f)(4) of the Code) owned by the Company or any of its
Subsidiaries.

                      (m) Neither the Company nor any of its  Subsidiaries  is a
party  to,  or owes  any  amount  under,  any Tax  sharing,  indemnification  or
allocation  agreement.  Neither the Company nor any of its  Subsidiaries (i) has
been a member of an affiliated  group filing a  consolidated  federal income Tax
return  (other than a group the common  parent of which was the Company) or (ii)
has any liability for Taxes of any person (other than any of the Company and its
Subsidiaries)  under Treas.  Reg. Section 1.1502-6 (or any similar  provision of
state,  local or foreign  law),  as a transferee  or  successor,  by contract or
otherwise.

                      (n) Each of the Company's and its  Subsidiaries' Tax basis
in its assets for purposes of determining its future amortization,  depreciation
and  other  federal  income  Tax  deductions  is  accurately  reflected  on  its
respective  Tax  books  and  records.  WI  Disclosure  Schedule  sets  forth the
following  information  with respect to each of the Company and its Subsidiaries
(or with respect to each of the Subsidiaries) as of the most recent  practicable
date: (i) the basis of the stockholder(s) of any Subsidiary it its stock (or the
amount of any excess loss account);  (ii) the amount of any net operating  loss,
net capital loss,  unused  investment or other  credit,  unused  foreign tax, or
excess charitable  contribution allocable to the Company or any Subsidiary;  and
(iii) the amount of any  deferred  gain or loss  allocable to the Company or any
Subsidiary arising out of any deferred intercompany transaction.

                      (o) Neither the Company nor any of its Subsidiaries is and
has not been at any time, a "United  States real property  holding  corporation"
within the meaning of Section 897(c)(2) of the Code.


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<PAGE>
                      (p) Except as may be required as a result of the Purchase,
the  Company  and its  Subsidiaries  have not been and will not be  required  to
include any adjustment in taxable income for any Tax period (or portion thereof)
pursuant to Section 481 or Section 263A of the Code or any comparable  provision
under  state or  foreign  Tax laws as a result  of the  transactions,  events or
accounting methods employed prior to Closing.

                      (q) WI Disclosure  Schedule  lists (i) any Tax  exemption,
Tax  holiday or other  Tax-sparing  arrangement  that the  Company or any of its
subsidiaries has in any jurisdiction,  including the nature,  amount and lengths
of such Tax exemption, Tax holiday or other Tax-sparing arrangement and (ii) any
expatriate  tax  programs  or  policies  affecting  the  Company  or  any of its
Subsidiaries.  Each of the Company and its Subsidiaries is in full compliance in
all material respects with all terms and conditions required to maintain any Tax
exemption,  Tax  holiday  or  other  Tax-sparing  arrangement  or  order  of any
Governmental  Entity  and the  consummation  of the  Purchase  will not have any
adverse  effect on the  continued  validity  and  effectiveness  of any such Tax
exemption, Tax holiday or other Tax-sparing arrangement or order.

                  3.21 Employee Benefit Plans.

                      (a) The WI Disclosure  Schedule lists,  with respect to WI
and any trade or business  (whether or not  incorporated)  which is treated as a
single  employer  with WI (an "ERISA  Affiliate")  within the meaning of Section
414(b), (c), (m) or (o) of the Code, (i) all material employee benefit plans (as
defined in Section 3(3) of the Employee  Retirement Income Security Act of 1974,
as amended  ("ERISA")),  (ii) each loan to a  non-officer  employee in excess of
$5,000,  loans to officers and directors and any stock option,  stock  purchase,
phantom stock, stock appreciation  right,  supplemental  retirement,  severance,
sabbatical,  medical,  dental,  vision care,  disability,  employee  relocation,
cafeteria  benefit (Code Section 125) or dependent care (Code Section 129), life
insurance  or accident  insurance  plans,  programs or  arrangements,  (iii) all
bonus,  pension,  profit sharing,  savings,  deferred  compensation or incentive
plans,  programs or  arrangements,  (iv) other fringe or employee benefit plans,
programs or arrangements  that apply to senior  management of WI and that do not
generally  apply to all employees,  and (v) any current or former  employment or
executive  compensation  or severance  agreements,  written or otherwise,  as to
which  unsatisfied  obligations  of WI of  greater  than  $5,000  remain for the
benefit  of or  relating  to,  any  present or former  employee,  consultant  or
director of WI (together, the "WI Employee Plans").

                      (b) WI has  furnished  to OWT a  copy  of  each  of the WI
Employee Plans and related plan documents (including trust documents,  insurance
policies or contracts,  employee  booklets,  summary plan descriptions and other
authorizing documents, and, to the extent still in its possession,  any material
employee  communications  relating  thereto)  and has,  with  respect to each WI
Employee  Plan which is subject to  reporting  requirements  under  ERISA or the
Code,  provided  copies of the Form 5500  reports  filed for the last three plan
years. Any WI Employee Plan intended to be qualified under Section 401(a) of the
Code  has  either  obtained  from  the  Internal  Revenue  Service  a  favorable
determination  letter as to its qualified  status under the Code,  including all
amendments  to the Code  effected  by the Tax Reform Act of 1986 and  subsequent
legislation (to the extent required by the Code), or has applied to the Internal
Revenue Service for such a  determination  letter prior to the expiration of the
requisite  period under  applicable  Treasury  Regulations  or Internal  Revenue
Service  pronouncements in which to apply for such  determination  letter and to
make any amendments necessary to obtain a favorable  determination,  or has been
established  under a standardized  prototype plan for which an Internal  Revenue
Service  opinion letter has been obtained by the plan sponsor and is valid as to
the adopting  employer.  WI has also furnished OWT with the most recent Internal
Revenue Service determination or opinion letter issued with respect to each such
WI  Employee  Plan,  and nothing has  occurred  since the  issuance of each such
letter which could reasonably be expected to cause the loss of the tax-qualified
status of any WI Employee Plan subject to Code Section 401(a).

                      (c) (i) None of the WI Employee Plans promises or provides
retiree medical or other retiree welfare benefits to any person;  (ii) there has
been no  "prohibited  transaction,"  as such term is defined  in Section  406 of
ERISA and Section 4975 of the Code, with respect to any WI Employee Plan,  which
could  reasonably  be expected to have,  in the  aggregate,  a Material  Adverse
Effect; (iii) each WI Employee Plan has been administered in accordance with its
terms  and in  compliance  with  the  requirements  prescribed  by any  and  all
statutes,  rules and regulations (including ERISA and the Code), except as would
not  have,  in the  aggregate,  a  Material  Adverse  Effect,  and  WI and  each
subsidiary or ERISA Affiliate have performed all material  obligations  required
to be performed by them under,  are not in any material respect in default under
or violation  of and have no  knowledge of any material  default or violation by
any other party to, any of the WI Employee Plans;  (iv) neither WI nor any other
ERISA  Affiliate is subject to any  liability  or penalty  under  Sections  4976
through  4980 of the  Code or  Title I of ERISA  with  respect  to any of the WI
Employee Plans; (v) all material  contributions required to be made by WI or any
other ERISA  Affiliate to any WI Employee Plan have been made on or before their
due dates and a reasonable  amount has been accrued for contributions to each WI
Employee Plan for the current plan years;  (vi) with respect to each WI Employee
Plan,  no  "reportable  event"  within  the  meaning  of  Section  4043 of ERISA
(excluding any such event for which the thirty (30) day notice  requirement  has
been  waived  under the  regulations  to  Section  4043 of ERISA)  nor any event
described in Section 4062,  4063 or 4041 or ERISA has occurred;  and (vii) no WI
Employee Plan is covered by, and neither WI or ERISA

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<PAGE>

Affiliate has incurred or expects to incur any liability under Title IV of ERISA
or Section 412 of the Code.  With  respect to each WI Employee  Plan  subject to
ERISA as either an employee  pension  plan within the meaning of Section 3(2) of
ERISA or an employee  welfare benefit plan within the meaning of Section 3(l) of
ERISA, WI has prepared in good faith and timely filed all requisite governmental
reports  (which were true and correct as of the date filed) and has properly and
timely  filed and  distributed  or posted all notices  and reports to  employees
required  to be  filed,  distributed  or  posted  with  respect  to each such WI
Employee Plan. No suit,  administrative  proceeding,  action or other litigation
has been  brought,  or to the  knowledge  of WI is  threatened,  against or with
respect to any such WI Employee Plan,  including any audit or inquiry by the IRS
or United States  Department of Labor.  Neither WI nor any other ERISA Affiliate
is a party  to,  or has made  any  contribution  to or  otherwise  incurred  any
obligation under, any "multiemployer plan" as defined in Section 3(37) of ERISA.

                      (d) With respect to each WI Employee  Plan, WI and each of
its United States subsidiaries have complied with (i) the applicable health care
continuation  and  notice   provisions  of  the   Consolidated   Omnibus  Budget
Reconciliation Act of 1985 ("COBRA") and the proposed regulations thereunder and
(ii)  the  applicable  requirements  of the  Family  Leave  Act of 1993  and the
regulations  thereunder,  except to the extent that such failure to comply would
not in the aggregate, have a Material Adverse Effect.

                      (e) The consummation of the  transactions  contemplated by
this  Agreement  will not (i) entitle  any  current or former  employee or other
service provider of WI or any other ERISA Affiliate to severance benefits or any
other payment (including, without limitation,  unemployment compensation, golden
parachute  or bonus),  except as  expressly  provided in this  Agreement or (ii)
accelerate the time of payment or vesting of any such benefits,  or increase the
amount of compensation due any such employee or service provider.

                      (f) There has been no amendment to, written interpretation
or  announcement  (whether or not  written)  by WI or any other ERISA  Affiliate
relating to, or change in  participation or coverage under, any WI Employee Plan
which would  materially  increase the expense of maintaining such plan above the
level of expense  incurred  with respect to that plan for the most recent fiscal
year included in WI's financial statements.

                  3.22 Employee Matters.  WI is in compliance with all currently
applicable laws and regulations respecting  discrimination in employment,  terms
and conditions of employment,  wages,  hours and occupational  safety and health
and employment practices, except for such noncompliance as has not and would not
reasonably be expected to have had a Material  Adverse  Effect on WI, and is not
engaged in any unfair labor  practice.  There are no pending  claims  against WI
under any workers'  compensation plan or policy or for long term disability.  WI
has no material  obligations under COBRA with respect to any former employees or
beneficiaries thereunder.  There are no proceedings pending or, to the knowledge
of WI, threatened, between WI and its employees, which proceedings have or could
reasonably  be  expected  to have a Material  Adverse  Effect on WI. WI is not a
party to any collective  bargaining  agreement or other labor union contract nor
does WI know of any activities or proceedings of any labor union to organize its
employees.  There has been no claim  against WI based on actual or alleged race,
age, sex, disability or other harassment or discrimination,  or similar tortuous
conduct, nor, to WI's knowledge, is there any basis for such claim. In addition,
WI has provided all  employees  with all  relocation  benefits,  stock  options,
bonuses and incentives, and all other compensation earned up through the date of
this Agreement.

                  3.23 Insurance.  The WI Disclosure  Schedule lists each policy
of insurance and bonds held by WI. WI has policies of insurance and bonds of the
type and in amounts  customarily  carried by persons  conducting  businesses  or
owning assets  similar to those of WI. There is no material  claim pending under
any of such policies or bonds as to which coverage has been  questioned,  denied
or disputed by the  underwriters of such policies or bonds. All premiums due and
payable under all such policies and bonds have been paid and WI are otherwise in
compliance with the terms of such policies and bonds. WI has no knowledge of any
threatened  termination of, or material premium increase with respect to, any of
such policies.

                  3.24  Compliance  With Laws.  WI has complied  with, is not in
violation of and has not received any notices of violation  with respect to, any
federal state,  local or foreign statute,  law or regulation with respect to the
conduct of its business,  or the ownership or operation of its business,  except
for such violations or failures to comply as could not be reasonably expected to
have a Material Adverse Effect on WI.

                  3.25  Ownership of Shares and Options.  Except as set forth in
the WI  Disclosure  Schedule,  each Seller owns of record and  beneficially  the
number of shares of WI Common Stock indicated opposite such Seller's name in the
WI Disclosure  Schedule hereto, as applicable,  with full right and authority to
sell or exchange, as applicable, such securities hereunder, and upon delivery of
such shares  hereunder,  OWT will receive good title thereto,  free and clear of
all mortgages,  pledges or security  interests and not subject to any agreements
or  understandings  among any Persons  with respect to the voting or transfer of
such securities  other than those arising under agreements to which EMCON or OWT
is a party.

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

                  3.27 Brokers or Finders.  Neither WI nor either of the Sellers
nor any of such  Sellers'  agents has  incurred  any  obligation  or  liability,
contingent or otherwise,  for brokerage or finders' fees or agents'  commissions
or other similar payment in connection  with this Agreement or the  transactions
contemplated hereby.

                  3.28 Representations  Complete. None of the representations or
warranties made by WI herein or in any Schedule or Exhibit hereto, including the
WI  Disclosure  Schedule,  or  certificate  furnished  by WI  pursuant  to  this
Agreement  or any  written  statement  furnished  to OWT  pursuant  hereto or in
connection with the transactions  contemplated  hereby,  when all such documents
are read together in their entirety,  contain,  or will contain at the Effective
Time any  untrue  statement  of a  material  fact,  or omits or will omit at the
Effective  Time to  state  any  material  fact  necessary  in  order to make the
statements  contained herein or therein, in the light of the circumstances under
which made, not misleading.

          4.  Representations and Warrantees of OWT. OWT represents and warrants
to WI as follows: 

                  4.1  Organization,  Standing and Power.  OWT is a  corporation
duly  organized,  validly  existing and in good  standing  under the laws of the
State of Delaware.

                  4.2 Authority.  OWT has, and will have as of the Closing Date,
all requisite  corporate power and authority to enter into this Agreement and to
consummate the transactions  contemplated  hereby. The execution and delivery of
this  Agreement  has,  and  as of  the  Closing  Date  the  consummation  of the
transactions  contemplated  hereby  will  have  been,  duly  authorized  by  all
necessary  corporate  action on the part of OWT.  This  Agreement  has been duly
executed and delivered by OWT and constitutes  the valid and binding  obligation
of OWT  enforceable  against OWT in  accordance  with its terms,  except as such
enforceability  may be limited by  bankruptcy,  insolvency,  moratorium or other
similar  laws  affecting  or relating to  creditors'  rights  generally,  and is
subject to general  principles  of equity.  The  execution  and delivery of this
Agreement by OWT does not, and the consummation of the transactions contemplated
hereby will not  conflict  with or result in any  violation  of (with or without
notice  or lapse of time,  or both)  (i) any  provision  of the  Certificate  of
Incorporation or Bylaws of OWT, or (ii) any material mortgage, indenture, lease,
contract  or other  agreement  or  instrument,  permit,  concession,  franchise,
license,  judgment,  order, decree, statute, law, ordinance,  rule or regulation
applicable  to OWT or any of its  properties  or assets.  No consent,  approval,
order or  authorization  of, or  registration,  declaration  or filing with, any
Governmental Entity is required by or with respect to OWT in connection with the
execution and delivery of this Agreement or the consummation of the transactions
contemplated  hereby,  except  for  such  consents,   authorizations,   filings,
approvals and  registrations  which,  if not obtained or made,  would not have a
Material  Adverse  Effect on OWT and would not  prevent or  materially  alter or
delay any of the transactions contemplated by this Agreement.

          5. Preclosing Covenants of WI

                  5.1 Conduct of Business of WI. During the period from the date
of this  Agreement and continuing  until the earlier of the  termination of this
Agreement or the Closing, WI agrees (except to the extent expressly contemplated
by this Agreement or as consented to in writing by OWT), to carry on its and its
subsidiaries' business in the usual regular and ordinary course in substantially
the same manner as heretofore conducted; to pay and to cause its subsidiaries to
pay debts and Taxes when due subject (i) to good faith  disputes over such debts
or Taxes and (ii) to OWT's  consent to the  filing of  material  Tax  Returns if
applicable;  to pay or  perform  other  obligations  when  due,  and to use  all
reasonable efforts to preserve intact its present business  organizations,  keep
available  the services of its and its  subsidiaries'  present  officers and key
employees and preserve its and its subsidiaries'  relationships  with customers,
suppliers,  distributors,  licensers,  licensees,  and  others  having  business
dealings with it or its subsidiaries,  to the end that its and its subsidiaries'
goodwill and ongoing  businesses  shall be unimpaired at the Effective  Time. WI
agrees to promptly notify OWT of (x) any event or occurrence not in the ordinary
course of its or its subsidiaries' business, and of any event which could have a
Material Adverse Effect on WI and (y) any material change in its  capitalization
as set forth in Section 3.4. Without limiting the foregoing, except as expressly
contemplated by this Agreement or the WI Disclosure  Schedule,  WI shall not do,
cause or  permit  any of the  following,  or allow,  cause or permit  any of its
subsidiaries  to do,  cause or permit any of the  following,  without  the prior
written consent of OWT:


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<PAGE>


                      (a) Charter  Documents.  Cause or permit any amendments to
its Articles of Incorporation or Bylaws;
                               

                      (b) Dividends;  Changes in Capital  Stock.  Declare or pay
any  dividends  on or make any other  distributions  (whether in cash,  stock or
property)  in  respect  of  any of its  capital  stock,  or  split,  combine  or
reclassify  any of its capital  stock or issue or authorize  the issuance of any
other  securities in respect of, in lieu of or in substitution for shares of its
capital stock, or repurchase or otherwise acquire,  directly or indirectly,  any
shares  of its  capital  stock  except  from  former  employees,  directors  and
consultants in accordance with agreements providing for the repurchase of shares
in connection with any termination of service to it or its subsidiaries;

                      (c) Material  Contracts.  Enter into any material contract
or commitment,  or violate,  amend or otherwise modify or waive any of the terms
of any of its material contracts,  other than in the ordinary course of business
consistent with past practice;

                      (d)  Issuance  of  Securities.  Issue,  deliver or sell or
authorize or propose the  issuance,  delivery or sale of, or purchase or propose
the purchase of, any shares of its capital stock or securities convertible into,
or subscriptions, rights, warrants or options to acquire, or other agreements or
commitments  of any  character  obligating  it to issue any such shares or other
convertible securities;

                      (e)  Intellectual  Property.  Transfer  to any  person  or
entity any rights to its Intellectual Property other than in the ordinary course
of business consistent with past practice;

                      (f) Exclusive  Rights.  Enter into or amend any agreements
pursuant  to which any  other  party is  granted  exclusive  marketing  or other
exclusive  rights of any type or scope with  respect to any of its  products  or
technology;

                      (g)  Dispositions.   Sell,  lease,  license  or  otherwise
dispose  of or  encumber  any of its  properties  or assets  which are  material
individually or in the aggregate, to its business, except in the ordinary course
of business consistent with past practice;

                      (h)  Indebtedness.  Incur any  indebtedness  for  borrowed
money or guarantee any such indebtedness or issue or sell any debt securities or
guarantee any debt securities of others;

                      (i)  Agreements.  Enter  into,  terminate  or amend,  in a
manner  which  will  adversely  affect  the  business  of WI (i)  any  agreement
involving an obligation to pay or the right to receive $5,000 or more,  (ii) any
agreement relating to the license,  transfer or other disposition or acquisition
of  intellectual  property  rights or rights to market or sell WI  products,  or
(iii) any other agreement which is material to the business or prospects of WI.

                      (j) Payment of Obligations.  Pay, discharge or satisfy, in
an  amount  in  excess of $5,000  in the  aggregate,  any  claim,  liability  or
obligation (absolute, accrued, asserted or unasserted,  contingent or otherwise)
arising other than in the ordinary  course of business,  other than the payment,
discharge or satisfaction of liabilities reflected or reserved against in the WI
Financial Statements;

                      (k) Capital  Expenditures.  Make any capital expenditures,
capital  additions  or capital  improvements  except in the  ordinary  course of
business and consistent with past practice;

                      (l)  Insurance.   Materially  reduce  the  amount  of  any
material insurance coverage provided by existing insurance policies;

                      (m) Termination or Waiver. Terminate or waive any right of
substantial value, other than in the ordinary course of business;

                      (n) Employee  Benefit  Plans;  New Hires;  Pay  Increases.
Adopt or amend any employee  benefit or stock  purchase or option plan,  or hire
any new employee, pay any special bonus or special remuneration (except payments
made pursuant to written agreements outstanding on the date hereof), or increase
the salaries or wage rates of its  employees  except in the  ordinary  course of
business in accordance with its standard past practice;

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<PAGE>

                      (o)  Severance   Arrangements.   Grant  any  severance  or
termination  pay (i) to any  director  or officer or (ii) to any other  employee
except (A) payments made pursuant to written agreements  outstanding on the date
hereof or (B)  grants  which are made in the  ordinary  course  of  business  in
accordance with its standard past practice;

                      (p)  Lawsuits.  Commence a lawsuit  other than (i) for the
routine  collection  of  bills,  (ii)  in such  cases  where  it in  good  faith
determines that failure to commence suit would result in the material impairment
of a valuable  aspect of its business,  provided that it consults with OWT prior
to the filing of such a suit, or (iii) for a breach of this Agreement;

                      (q)  Acquisitions.  Acquire or agree to acquire by merging
or consolidating  with, or by purchasing a substantial portion of the assets of,
or  by  any  other  manner,  any  business  or  any  corporation,   partnership,
association  or other  business  organization  or division  thereof or otherwise
acquire or agree to acquire any assets which are material individually or in the
aggregate, to its business;

                      (r) Taxes.  Other than in the ordinary course of business,
make or change any  material  election in respect of Taxes,  adopt or change any
accounting  method in  respect  of Taxes,  file any  material  Tax Return or any
amendment to a material Tax Return, enter into any closing agreement, settle any
material claim or assessment in respect of Taxes, or consent to any extension or
waiver of the limitation  period  applicable to any material claim or assessment
in respect of Taxes;

                      (s)Revaluation.  Revalue  any  of  its  assets,  including
without  limitation  writing down the value of inventory or writing off notes or
accounts receivable other than in the ordinary course of business; or

                      (t) Other.  Take or agree in writing or otherwise to take,
any of the  actions  described  in Sections  5.1 (a)  through (s) above,  or any
action which would cause a material breach of its  representations or warranties
contained in this Agreement or prevent it from materially performing or cause it
not to materially perform its covenants hereunder.

                  5.2 Access to Information.  Until the Closing,  WI shall allow
OWT and its agents and representatives  reasonable access upon reasonable notice
and  during  normal  working  hours to its files,  books,  records  and  offices
including,  without  limitation,  any and all  information  relating  to  taxes,
commitments,  contracts,  leases,  licenses and personal  property and financial
condition.  Until the Closing,  WI shall cause its accountants to cooperate with
OWT, OWT and their agents and  representatives in making available all financial
information requested,  including,  without limitation, the right to examine all
working  papers  pertaining to all financial  statements  prepared or audited by
such accountants.

                  5.3  Exclusivity..  During  the  period  from the date of this
Agreement  until the earlier of the termination of this Agreement or the Closing
Date, WI or the Sellers shall not, directly or indirectly,  through any officer,
director, employee, representative or agent, (i) solicit, initiate, or encourage
any inquiries or proposals that  constitute,  or could reasonably be expected to
lead to, a proposal or offer for a merger, consolidation,  business combination,
sale of substantial  assets,  sale of shares of capital stock (including without
limitation by way of a tender offer) or similar transactions involving WI, other
than the  transactions  contemplated  by this  Agreement  (any of the  foregoing
inquiries or proposals  being referred to in this Agreement as a "WI Acquisition
Proposal"),  (ii) engage in negotiations or discussions  concerning,  or provide
any  non-public  information  to  any  person  or  entity  relating  to,  any WI
Acquisition Proposal, or (iii) agree to, approve or recommend any WI Acquisition
Proposal.

                      (a) WI or the  Sellers  shall  notify  OWT no  later  than
twenty-four  (24)  hours  after  receipt  by WI  (or  its  advisors)  of  any WI
Acquisition Proposal or any request for nonpublic information in connection with
a WI Acquisition  Proposal or for access to the properties,  books or records of
WI by any person or entity that informs WI that it is considering making, or has
made, a WI Acquisition Proposal. Such notice shall be made orally and in writing
and shall  indicate  in  reasonable  detail the  identity of the offeror and the
terms and conditions of such proposal, inquiry or contact.

          6. Mutual Covenants..

                  6.1 No Public Announcement.  Neither WI nor OWT shall make any
public  announcement  concerning  this  Agreement,  any memos,  letters or other
agreements  or the  discussions  between  the parties  relating to the  Purchase
including the Letter of Intent dated September 21, 1998, between OWT and WI (the
"Letter of Intent") without the prior written approval


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<PAGE>


of the other party, which approval will not be delayed or unreasonably withheld;
provided that either party may make disclosure if required under applicable law,
but only after reasonable consultation with the other.

                  6.2 Consents;  Cooperation.. Each of OWT and WI shall promptly
apply for or otherwise  seek,  and use  reasonable  best efforts to obtain,  all
consents and approvals required to be obtained by it for the consummation of the
transactions  contemplated  by this  Agreement  and  shall use  reasonable  best
efforts to obtain all necessary consents, waivers and approvals under any of its
material  contracts in  connection  with such  transactions  for the  assignment
thereof or otherwise.

                  6.3  Legal  Requirements.  Each of OWT and WI  will  take  all
reasonable  actions  necessary to comply  promptly  with all legal  requirements
which  may  be  imposed  on  them  with  respect  to  the  consummation  of  the
transactions contemplated by this Agreement and will promptly cooperate with and
furnish  information to any party hereto  necessary in connection  with any such
requirements  imposed upon such other party in connection with the  consummation
of the transactions  contemplated by this Agreement and will take all reasonable
actions necessary to obtain (and will cooperate with the other parties hereto in
obtaining) any consent, approval, order or authorization of or any registration,
declaration or filing with, any Governmental Entity or other person, required to
be obtained or made in connection with the taking of any action  contemplated by
this Agreement.

                  6.4  Confidentiality.  The parties acknowledge that EMCON, OWT
and WI have previously executed a non-disclosure  agreement dated August 1, 1998
(the  "Non-Disclosure  Agreement"),  which  Non-Disclosure  Agreement  is hereby
incorporated  herein by reference and shall continue in full force and effect in
accordance with its terms.

                  6.5 Public  Disclosure.  Unless  otherwise  permitted  by this
Agreement,  OWT and WI shall  consult with each other  before  issuing any press
release or otherwise  making any public statement or making any other public (or
non-confidential)  disclosure  (whether  or  not  in  response  to  an  inquiry)
regarding the terms of this Agreement and the transactions  contemplated hereby,
and neither  shall issue any such press  release or make any such  statement  or
disclosure  without the prior approval of the other (which approval shall not be
unreasonably  withheld),  except  as may be  required  by law or by  obligations
pursuant to any listing agreement with any national  securities exchange or with
NASDAQ.

                  6.6 Further  Assurances.  Prior to and  following the Closing,
each party agrees to cooperate  fully with the other parties and to execute such
further  instruments,  documents and agreements and to give such further written
assurances, as may be reasonably requested by any other party to better evidence
and reflect the transactions  described  herein and  contemplated  hereby and to
carry into effect the intents and purposes of this Agreement.

                  6.7 Expenses. WI is authorized to incur expenses for legal and
accounting  services to review this  Agreement,  the  Employment  Agreement  and
Non-Competition  Agreement with Bruce Nave and the related documents  comprising
the transactions  contemplated herein with the limitation that any such expenses
that  exceed  $10,000  shall  be borne  exclusively  by Bruce  and  Marcia  Nave
personally.  Such expenses  shall be paid after the Closing  within a reasonable
time after  submission  of an itemized  billing  statement by legal  counsel and
accounting advisor.

                  6.8  EMCON  Stock  Options.  After  the  Closing,  options  to
purchase an  aggregate  10,000  shares of EMCON Common Stock shall be granted to
employees  of WI  consistent  with the  standard  terms of the EMCON  1998 Stock
Option Plan.

          7.  Conditions to Each Party's  Obligations.  The  obligations of each
party to close the transactions contemplated under this Agreement are subject to
the fulfillment or  satisfaction,  on or before the Closing Date, of each of the
following  conditions  (any of which may be waived by the party  benefiting from
such condition, but only in a writing executed by such party):

                  7.1 No  Injunctions or  Restraints;  Illegality.  No temporary
restraining order,  preliminary or permanent injunction or other order issued by
any court of competent  jurisdiction  or other legal or regulatory  restraint or
prohibition  preventing the  consummation of the Purchase shall be and remain in
effect,  nor  shall  any  proceeding  brought  by an  administrative  agency  or
commission  or other  governmental  authority  or  instrumentality,  domestic or
foreign,  seeking any of the  foregoing be pending,  which would have a Material
Adverse  Effect on OWT or WI after the  Closing,  nor shall  there be any action
taken, or any statute, rule, regulation or order enacted,  entered,  enforced or
deemed applicable to the Purchase,  which makes the consummation of the Purchase
illegal.  In the event an injunction or other order shall have been issued, each
party agrees to use its reasonable  diligent  efforts to have such injunction or
other order lifted.


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<PAGE>


                  7.2  Governmental  Approval.  OWT and WI and their  respective
subsidiaries shall have timely obtained from each applicable Governmental Entity
all approvals, waivers and consents, if any, necessary for consummation of or in
connection with the Purchase and the several  transactions  contemplated hereby,
other than filings and  approvals  relating to the  Purchase or affecting  OWT's
ownership  of WI or any of its  properties  if failure to obtain such  approval,
waiver or consent  would not have a Material  Adverse  Effect on OWT or WI after
the Closing.

          8. Conditions to the Sellers' Obligations. The Sellers' obligations to
close the  transactions  contemplated  under this  Agreement  are subject to the
fulfillment  or  satisfaction,  on or before the  Closing  Date,  of each of the
following  conditions (any of which may be waived by the Sellers,  but only in a
writing signed by either Seller):

                  8.1   Accuracy  of   Representations   and   Warranties.   The
representations  and  warranties  of OWT set forth in Section 4 shall be true in
all  material  respects  on and as of the  Closing  Date with the same force and
effect as if they had been made at the Closing,  and the Sellers shall receive a
certificate to such effect signed by an officer of OWT.

                  8.2  Covenants  and  Conditions.  All of the  covenants of OWT
contained in Sections 6 and all of the conditions set forth in Section 7 of this
Section 8 shall have been performed,  complied with or satisfied in all material
respects on or before the Closing,  and the Sellers  shall receive a certificate
to such effect signed by an officer of OWT.

                  8.3 Employment and Non-Competition  Agreements. OWT shall have
executed and delivered to Bruce Nave an Employment and Non-Competition Agreement
substantially in the form of Exhibit B attached hereto.

                  8.4 Documents.  All of the documents  required to be delivered
by OWT  pursuant to this  Agreement  shall have been  delivered  and the Sellers
shall be reasonably satisfied with the content and form of all such documents.

                  8.5 Release of Personal  Guaranty.  EMCON,  WI and each of the
Sellers shall have entered into a Letter  Agreement,  substantially  in the form
attached hereto as Exhibit C, agreeing to and  acknowledging  the release of the
personal  guaranty  granted  by each  of the  Sellers  to  EMCON  pursuant  to a
promissory note of WI dated October 23, 1998 in the principal amount of $27,000,
a  promissory  note of WI dated  October  29,  1998 in the  principal  amount of
$10,000 and a promissory  note of WI dated  November  30, 1998 in the  principal
amount of $60,000.

          9. Conditions to OWT's Obligations. The obligations of OWT are subject
to the  fulfillment or  satisfaction,  on or before the Closing Date, of each of
the following  conditions  (any one of which may be waived by OWT, but only in a
writing signed by OWT):

                  9.1   Accuracy  of   Representations   and   Warranties.   The
representations  and  warranties  of WI and the Sellers  contained  in Section 3
shall be true in all material  respects,  on and as of the Closing Date with the
same  force and  effect as if they had been made at the  Closing,  and OWT shall
have received a certificate to such effect signed by each of the Sellers.

                  9.2 Covenants and Conditions.  All material  respects with all
of the  covenants  of the Sellers  contained  in Sections 5 and 0 and all of the
conditions set forth in Section 7 and this Section 9 shall have been  performed,
complied  with or satisfied  in all material  respects on or before the Closing,
and OWT shall have received a  certificate  to such effect signed by each of the
Sellers.

                  9.3  Certificate of Secretary.  WI shall have delivered to OWT
copies of its Articles of Incorporation,  Bylaws and all resolutions  adopted by
the Board of Directors and  shareholders of WI pertaining to the Purchase,  each
certified by the  Secretary or an Assistant  Secretary of WI as being  accurate,
complete and in full force and effect.

                  9.4 No Material Adverse Change.  Since the Balance Sheet Date,
there shall not have  occurred  any  material  adverse  change in the  financial
condition,   properties,  assets  (including  intangible  assets),  liabilities,
business, operations or results of operations of WI, taken as a whole.

                  9.5 Repayment and Cancellation of Promissory  Note.. OWT shall
have received cash payment from the Sellers against the promissory note of WI in
the  principal  amount of  $89,000,  and such  promissory  note and any  accrued
interest  shall be canceled  upon receipt of such payment  pursuant to the terms
thereof.

                  9.6 Third Party  Consents.  OWT shall have been furnished with
evidence  satisfactory  to it of the consent or approval of those  persons whose
consent or approval is required in connection with the Purchase.


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<PAGE>

                  9.7  Employment  and  Non-Competition  Agreements.  Bruce Nave
shall have executed and delivered the Employment and
Non-Competition Agreement.

                  9.8  Delivery of Stock  Certificates.  The Sellers  shall have
delivered to OWT stock certificates  representing all of the outstanding capital
stock of WI  endorsed  or  accompanied  by executed  assignments  separate  from
certificate.

                  9.9  Opinion of  Counsel;  WI Legal  Expenses.  OWT shall have
received a written opinion from the offices of Mark A. Sippel,  P.C., counsel to
WI ("Sippel"), in substantially the form attached hereto as Exhibit D. OWT shall
have  received a  statement  from Sippel  stating  the amount of legal  expenses
accrued by WI as of the Closing  Date,  and the Sellers  shall have  delivered a
check  to OWT for any  legal  and  accounting  expenses  in the  aggregate  over
$10,000, pursuant to Section 6.7 hereof.

                  9.10  Termination  of  Employment  Agreements.  WI shall  have
terminated any oral or written  employment  agreements between WI and any of its
employees.

                  9.11 Documents.  All of the documents required to be delivered
by WI or the Sellers  pursuant to this  Agreement  shall have been delivered and
OWT  shall  be  reasonably  satisfied  with  the  content  and  form of all such
documents.

          10. Termination.

                  10.1 Termination. This Agreement may be terminated at any time
prior to the Closing as follows:

                      (a) by the mutual  written  consent of each of the parties
hereto;

                      (b) by either WI or OWT, if the  Closing has not  occurred
by December  31,  1998,  provided  that the right to  terminate  this  Agreement
pursuant  to this  Section  10.1 (b) shall not be  available  to any party whose
failure to fulfill any obligation or condition under this Agreement has been the
cause of or  resulted  in the  failure of the Closing to occur on or before such
date;

                      (c)  by  either  OWT  or  WI  if  a  court  of   competent
jurisdiction or other  Governmental  Entity having  jurisdiction over the matter
shall have issued a  nonappealable  final  order,  decree or ruling or taken any
other  action,  in each  case  having  the  effect of  permanently  restraining,
enjoining or otherwise prohibiting the Purchase, except, if the party relying on
such  order,  decree  or  ruling  or  other  action  has not  complied  with its
obligations under this Agreement; or

                      (d) by either OWT or WI, if there has been a breach of any
representation,  warranty,  covenant or agreement on the part of the other party
set forth in this Agreement, which breach (i) causes the conditions set forth in
Section 9.1 or 9.2 (in the case of termination by OWT) or Section 8.1 or 8.2 (in
the case of  termination by WI) not to be satisfied and (ii) shall not have been
cured within ten (10) business days following  receipt by the breaching party of
written notice of such breach from the other party.

Any  termination of this Agreement under this Section 10.1 shall be effective by
the delivery of written  notice of the  terminating  party to the other  parties
hereto.

                  10.2 Effect of  Termination.  In the event of  termination  of
this  Agreement  as provided in Section  10.1,  there shall be no  liability  or
obligation on the part of OWT, WI or their respective  officers,  directors,  or
shareholders, except to the extent that such termination results from the breach
by a party of any of its  representations,  warranties or covenants set forth in
this Agreement; provided that the provisions of Section 6.4 shall remain in full
force and effect and survive any termination of this Agreement.

                  10.3  Extension;  Waiver.  At any time prior to the  Effective
Time,  the parties  hereto,  by action taken or authorized  by their  respective
Boards of Directors, may, to the extent legally allowed, (i) extend the time for
the  performance  of any of the  obligations  or other acts of the other parties
hereto,  (ii)  waive any  inaccuracies  in the  representations  and  warranties
contained  herein or in any document  delivered  pursuant  hereto or (iii) waive
compliance  with any of the  agreements  or  conditions  contained  herein.  Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid only if set forth in a written instrument signed on behalf of such party.


                                       69
<PAGE>


                  10.4 Obligations  Following  Termination.  In the event of the
termination of this Agreement:

                      (a) each party,  if so requested by the other party,  will
(i) return  promptly every document  (other than documents  publicly  available)
furnished to it by the other party (or any  subsidiary,  division,  associate or
affiliate of such other party) in connection with the transactions  contemplated
hereby, whether so obtained before or after the execution of this Agreement, and
any copies thereof which may have been made, and will cause its  representatives
and any  representatives  of financial  institutions and investors and others to
whom such  documents  were  furnished  promptly to return such documents and any
copies  thereof any of them may have made,  or (ii) destroy such  documents  and
cause  its  representatives  and such  other  representatives  to  destroy  such
documents,  and such party shall deliver a certificate executed by its President
or Vice President stating to such effect; and

                      (b) WI and OWT shall  continue to abide by the  provisions
of the Non-Disclosure Agreement.

          11. Miscellaneous.

                  11.1 Governing  Law. This  Agreement  shall be governed by and
construed in accordance with the laws of California that might otherwise  govern
under  applicable  principles  of conflicts of law.  Each of the parties  hereto
irrevocably  consents to the exclusive  jurisdiction of any court located within
San Mateo County, State of California,  in connection with any matter based upon
or arising  out of this  Agreement  or the  matters  contemplated  hereby and it
agrees that process may be served upon it in any manner  authorized  by the laws
of the State of  California  for such  persons and waives and  covenants  not to
assert or plead any objection which it might otherwise have to such jurisdiction
and such process.

                  11.2 Notices. All notices and other  communications  hereunder
shall be in writing and shall be deemed duly  delivered if delivered  personally
(upon  receipt),  or three (3) business days after being mailed by registered or
certified mail, postage prepaid (return receipt requested),  or one (1) business
day after it is sent by reputable  nationwide overnight courier service, or upon
transmission,  if sent via  facsimile  (with  confirmation  of  receipt)  to the
parties at the following  address (or at such other address for a party as shall
be specified by like notice):



                                       70
<PAGE>


                  (a) if to OWT:

                      Organic Waste Technologies, Inc.
                      7550 Lucerne Drive, #110
                      Cleveland, OH
                      Attention:  Mary Geiger, Chief Financial Officer
                      Fax:  (440) 891-0300

                      with a copy to:

                      Gray Cary Ware & Freidenrich LLP
                      400 Hamilton Avenue
                      Palo Alto, CA  94301
                      Attention:  Paul A. Blumenstein, Esq.
                      Fax:  (650) 328-3699

                  (b) if to WI:

                      Western Industrial Resources Corporation
                      4711 North Falcon Drive, Suite 201
                      Mesa, AZ  85215
                      Attention:  President

                      with a copy to:

                      Gray Cary Ware & Freidenrich LLP
                      400 Hamilton Avenue
                      Palo Alto, CA  94301
                      Attention:  Paul A. Blumenstein, Esq.
                      Fax:  (650) 328-3699

                  (c) if to the Sellers:

                      Bruce and Marcia Nave
                      2236 North Rico Circle
                      Mesa, AZ 85213
                      
                      with a copy to:

                      Mark A. Sippel, P.C.
                      3260 North Hayden Road, Suite 214
                      Scottsdale, AZ 85251-6651
                      Attention:  Mark A. Sippel, Esq.

                  (d) if to EMCON:

                      EMCON
                      400 S. El Camino Real, Suite 1200
                      San Mateo, CA  94402
                      Attention:  R. Michael Momboisse, Chief Financial Officer
                      Fax:  (650) 375-0763

                      with a copy to:

                      Gray Cary Ware & Freidenrich LLP
                      400 Hamilton Avenue
                      Palo Alto, CA  94301
                      Attention:  Paul A. Blumenstein, Esq.
                      Fax:  (650) 328-3699



                                       71
<PAGE>

                  11.3 Binding  Upon  Successors  and  Assigns.  Subject to, and
unless  otherwise  provided in, this  Agreement,  each and all of the covenants,
terms,  provisions,  and agreements  contained herein shall be binding upon, and
inure  to  the  benefit  of,  the  permitted   successors,   executors,   heirs,
representatives, administrators and assigns of the parties hereto.

                  11.4 Severability.  If any provision of this Agreement, or the
application  thereof,  shall for any  reason  and to any  extent be  invalid  or
unenforceable, the remainder of this Agreement and application of such provision
to other persons or circumstances  shall be interpreted so as best to reasonably
effect the intent of the parties  hereto.  The parties  further agree to replace
such  void or  unenforceable  provision  of  this  Agreement  with a  valid  and
enforceable provision which will achieve, to the extent possible,  the economic,
business and other purposes of the void or unenforceable provision.

                  11.5 Remedies Cumulative. Except as otherwise provided herein,
any and all  remedies  herein  expressly  conferred  upon a party will be deemed
cumulative with and not exclusive of any other remedy  conferred  hereby,  or by
law or equity  upon such  party,  and the  exercise by a party of any one remedy
will not preclude the exercise of any other remedy.

                  11.6 Entire  Agreement.  This Agreement,  the exhibits hereto,
the documents  referenced herein (including the Non-Disclosure  Agreement),  and
the exhibits thereto,  constitute the entire  understanding and agreement of the
parties  hereto  with  respect to the  subject  matter  hereof and  thereof  and
supersede  all  prior  and   contemporaneous   agreements   or   understandings,
inducements  or  conditions,  express or implied,  written or oral,  between the
parties with respect  hereto and thereto.  The express terms hereof  control and
supersede any course of performance or usage of the trade  inconsistent with any
of the terms hereof.

                  11.7  Counterparts.  This  Agreement  may be  executed  in any
number of counterparts,  each of which shall be an original as against any party
whose signature  appears thereon and all of which together shall  constitute one
and the same instrument.

                  11.8  Amendment  and  Waivers.  Any term or  provision of this
Agreement may be amended,  and the  observance of any term of this Agreement may
be waived (either generally or in a particular instance and either retroactively
or prospectively) only by a writing signed by the party to be bound thereby. The
waiver by a party of any breach  hereof for default in payment of any amount due
hereunder or default in the performance hereof shall not be deemed to constitute
a waiver of any other default or any succeeding  breach or default.  The failure
of any party to enforce any of the  provisions  hereof shall not be construed to
be a waiver of the right of such party thereafter to enforce such provisions.

                  11.9 Survival of Agreements.  Except as otherwise provided for
herein, all covenants,  agreements,  representations  and warranties made herein
shall survive the execution and delivery of this Agreement and the  consummation
of the transactions contemplated hereby.

                  11.10  Construction  of  Agreement.  This  Agreement  has been
negotiated by the respective parties hereto and their attorneys and the language
hereof shall not be construed for or against any party.  The titles and headings
herein are for  reference  purposes  only and shall not in any manner  limit the
construction of this Agreement which shall be considered as a whole.

                  11.11 Absence of Third Party Beneficiary Rights. No provisions
of this Agreement are intended,  nor shall be interpreted,  to provide or create
any  third  party  beneficiary  rights  or any  other  rights of any kind in any
client,  customer,  affiliate,  shareholder,  partner of any party hereto or any
other person or entity  unless  specifically  provided  otherwise  herein,  and,
except as so provided,  all provisions  hereof shall be personal  solely between
the parties to this Agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]


                                       72

<PAGE>


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

WESTERN INDUSTRIAL RESOURCES              ORGANIC WASTE TECHNOLOGIES, INC.
CORPORATION 

By:  /s/ Bruce Nave
- - -----------------------------
        Bruce Nave, President             By:/s/ Mary Geiger
                                          ------------------------------------
                                          Mary Geiger, Chief Financial Officer



/s/ Bruce Nave
- - -----------------------------
    Bruce Nave

/s/ Marcia Nave
- - -----------------------------
    Marcia Nave



EMCON



By:/s/ R. Michael Momboisse
- - ----------------------------------------------------
       R. Michael Momboisse, Chief Financial Officer



                                       73
<PAGE>


                                    EXHIBITS


Exhibit A                      Earn-out Payment Schedule
Exhibit B                      Forms of Employment and Non-Competition Agreement
Exhibit C                      Form of Letter Agreement
Exhibit D                      Form of Legal Opinion






                                       74
<PAGE>



                                    EXHIBIT A

                            Earn-Out Payment Schedule


         OWT will pay to Sellers,  as soon as  practicable  following the end of
each of the calendar  years 1999,  2000 and 2001,  an amount equal to 50% of the
amount  by which  WI's  pre-tax  income  for such  year  exceeds  the  following
milestone amounts:

                                                      Pretax
           Earning Period                        Income Milestone
           --------------                        ----------------
           Calendar 1999                             $100,000
           Calendar 2000                             $150,000
           Calendar 2001                             $200,000

         Calculation  of WI's pretax  income for purposes of the above  earn-out
will be based on the application of GAAP,  consistently  applied,  including the
use of accrual  accounting.  OWT shall not  allocate  any portion of its general
corporate  overhead to WI for the  purposes of the above  earn-out  calculation,
provided that, to the extent OWT incurs expenses (e.g.,  insurance,  in-house or
outside legal services,  or accounting services) directly for the benefit of WI,
or otherwise provide  administrative  services for the benefit of WI, the actual
cost of such items,  without markup, shall be charged to WI for purposes of such
calculation.




                                       75



                                  EXHIBIT 10.3

                                      EMCON
                      SALARY CONTINUATION PLAN PARTICIPANTS

<TABLE>
<CAPTION>

                                            Monthly Payments
                                  --------------------------------------
                                        Salary                                    Date Payments
          Participant                Continuation           Non-compete              Commence
- - --------------------------------- -------------------- ----------------- ---------------------------------

<S>                                     <C>                 <C>          <C>                     <C> 
Thorley D. Briggs                       $1,800              $1,200       January                 1993
                                        $1,200              $  800       July                    1993

John G. Pacey                             -0-               $1,080       January                 1993

Donald R. Andres                        $1,800              $1,200       January                 1993

Richard J. Leach                          -0-               $  819       January                 1993

Fred W. Cope                            $  600              $  400       January                 1994

Robert E. Van Heuit                       -0-               $  400       January                 1994

H. Randolph Sweet                       $1,350              $  900       April                   1997

Eugene M. Herson                        $1,800              $1,200       November                2000
                                        $2,700              $1,800       November                2004

R. Michael Momboisse                    $  600              $  400       January                 2003
                                        $1,200              $  800       November                2004
                                        $  600              $  400       November                2006
                                        $  600              $  400       July                    2007

Gary O. McEntee                         $  600              $  400       November                2004

</TABLE>



                                       76



                                  EXHIBIT 10.31

                              EMPLOYMENT AGREEMENT
                               (Patrick Gillespie)


         THIS AGREEMENT is entered into effective the 10th day of November, 1998
by and  between  EMCON,  a  California  corporation  ("Employer"),  and  Patrick
Gillespie ("Employee").

                                    RECITALS

         WHEREAS, the parties hereto desire to set forth the terms of Employee's
continued employment with Employer.

                                    AGREEMENT

         NOW, THEREFORE,  for good and valuable consideration,  receipt of which
is hereby acknowledged, the parties hereto hereby agree as follows:

         1.  Duties.  Employer  shall  employ  Employee as a Vice  President  of
Employer  responsible  for the North Area of  Employer's  Professional  Services
Division as presently configured  (inclusive of all office locations,  Wehran of
Puerto Rico,  Airbank,  the Clean  Harbors  alliance and the Xenergy  alliance),
reporting  directly to Employer's  Chief Executive  Officer and with such duties
and responsibilities as are typical for an officer in a similar role.

         2. Term. Employee's employment pursuant to this Agreement will commence
on the date hereof and continue through January 3, 2002; provided, however, that
(i) this  Agreement  (except  Section 7  hereof)  shall  terminate  and be of no
further force or effect at the election of Employee,  upon violation by Employer
of its obligations hereunder or upon ninety (90) days advance notice by Employee
at any time after December 31, 1999, and (ii) this Agreement  (except Sections 6
and 7  hereof)  shall  terminate  and be of no  further  force or  effect at the
election  of  Employer  upon  termination  of  Employee's  employment  for cause
pursuant to Section 5, below.

         3.       Compensation.

                  (a) Employer  shall pay Employee a base salary  equivalent  to
$140,000  per  year,   in  equal   bi-weekly   installments   (less   applicable
withholding),  which salary may be adjusted upward, from time to time during the
term of this Agreement by Employer's Board of Directors.

                  (b) During  Employee's  full time  employment  with  Employer,
Employee shall be entitled to  participate  in all applicable  benefit plans and
bonus programs generally available to employees of Employer

                  (c) On the first  regular  pay day of January  1999 and on the
first  regular  pay day of each  applicable  year of the term of this  Agreement
(i.e. January 2000, January 2001, and January 2002). Employer shall pay Employee
a cash bonus of $50,000 per installment less applicable withholdings.

         4. Extent and Place of Services. During Employee's full time employment
with  Employer,  Employee  agrees to devote  Employee's  full  business  time to
employment with Employer. Employer shall


                                       77
<PAGE>


not transfer or relocate Employee from Employer's office in New Hampshire during
the term hereof without the approval of Employee.  In the event of a relocation,
Employee  shall be entitled to receive  relocation  assistance  consistent  with
Employer's relocation policy.

         5.  Termination  of  Employment.   Employee's   employment  under  this
Employment Agreement shall not be terminated without good cause shown. Dismissal
for cause is intended to embrace intentional or grossly negligent conduct on the
part of  Employee  which is  materially  detrimental  to the  operations  and/or
reputation of Employer.  By way of illustration  such actions would include (but
would not be limited to) material  breach of Employee's  obligations  under this
Employment Agreement, and/or conviction of a crime (other than minor infractions
such as parking or similar traffic  violations),  moral turpitude and revocation
by the applicable licensing authority of professional licenses (if any) material
to Employee's ability to perform Employee's employment obligations.

         6. Covenant Not to Compete. In consideration for the hiring of Employee
by Employer  during the term of this  Agreement,  Employee  shall not render any
services  or engage in any  activities  which are  competitive  with  Employer's
activities in any other state in which Employer conducts business.  In the event
of  any  breach  of the  foregoing  covenant,  the  Employee  acknowledges  that
Employer's  remedies at law will be inadequate and Employer shall be entitled to
seek  injunctive  relief,  as well as any rights  Employer may have at law or in
equity, including any rights regarding the misuse of confidential or proprietary
information.

         7.  Confidentiality.  Employee  agrees  to  keep  confidential  and not
disclose  or make any use of any  confidential  or  proprietary  information  of
EMCON,  except for EMCON's  benefit,  at any time either during or subsequent to
Employee's employment. Confidential or proprietary information is subject matter
pertaining  to any  business of EMCON or any of their  clients,  consultants  or
affiliates  which  Employee  may produce,  obtain,  become aware of or otherwise
acquire during the course of employment which is not public knowledge.

         8.       Miscellaneous.

                  (a) This Agreement and each of its provisions shall be binding
upon and  inure to the  benefit  of the  parties  hereto  and  their  respective
successors, representatives, and assigns.

                  (b) This  Agreement  shall be  governed  by and  construed  in
accordance  with the laws of the State of  Delaware  as applied to  transactions
between Delaware residents wholly within the State of Delaware. If any provision
of the Agreement is held invalid or  unenforceable  for any reason,  the parties
hereto agree that such  invalidity  will not affect the remaining  provisions of
this Agreement.

                  (c) This Agreement  constitutes the entire  Agreement  between
the parties with respect to the subject  matter hereof and it hereby  supersedes
any and all prior agreements or understandings  between the parties with respect
to such subject  matter.  This Agreement may not be amended or changed except by
an instrument in writing signed by the parties hereto.

                  (d)  This   Agreement   may  be   executed   in  one  or  more
counterparts,  each of which shall be an original  instrument,  but all of which
together shall constitute one and the same instrument.

                  (e) The  headings of this  Agreement  have been  inserted  for
convenience of reference  only and shall in no way restrict or otherwise  modify
any of the terms or provisions hereof.



                                       78
<PAGE>


         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as
of the day and year first above written.

EMPLOYER:                                             EMPLOYEE:
EMCON, a California corporation

By:     /s/ Eugene M. Herson                          /s/ Patrick Gillespie   
- - ----------------------------                          ---------------------
Title: President & Chief  Executive Officer               Patrick Gillespie






                                       79



                                  EXHIBIT 10.32

                              EMPLOYMENT AGREEMENT
                                 (Gerard Ridzon)


         THIS AGREEMENT is entered into effective the 10th day of November, 1998
by and between EMCON, a California corporation  ("Employer"),  and Gerard Ridzon
("Employee").

                                    RECITALS

         WHEREAS, the parties hereto desire to set forth the terms of Employee's
continued employment with Employer.

                                    AGREEMENT

         NOW, THEREFORE,  for good and valuable consideration,  receipt of which
is hereby acknowledged, the parties hereto hereby agree as follows:

         1.  Duties.  Employer  shall  employ  Employee as a Vice  President  of
Employer reporting directly to the Area Operations Manager for the North Area of
Employer's  Professional Services Division as presently configured (inclusive of
all office locations, Wehran of Puerto Rico, Airbank, the Clean Harbors alliance
and the  Xenergy  alliance)  and with such  duties and  responsibilities  as are
typical for an officer in a similar role.

         2. Term. Employee's employment pursuant to this Agreement will commence
on the date hereof and continue through January 3, 2002; provided, however, that
(i) this  Agreement  (except  Section 7  hereof)  shall  terminate  and be of no
further force or effect at the election of Employee,  upon violation by Employer
of its obligations hereunder or upon ninety (90) days advance notice by Employee
at any time after December 31, 1999, and (ii) this Agreement  (except Sections 6
and 7  hereof)  shall  terminate  and be of no  further  force or  effect at the
election  of  Employer  upon  termination  of  Employee's  employment  for cause
pursuant to Section 5, below.

         3.       Compensation.

                  (a) Employer  shall pay Employee a base salary  equivalent  to
$110,000  per  year,   in  equal   bi-weekly   installments   (less   applicable
withholding),  which salary may be adjusted upward, from time to time during the
term of this Agreement by Employer's Board of Directors.

                  (b) During  Employee's  full time  employment  with  Employer,
Employee shall be entitled to  participate  in all applicable  benefit plans and
bonus programs generally available to employees of Employer

                  (c) On the first  regular  pay day of January  1999 and on the
first  regular  pay day of each  applicable  year of the term of this  Agreement
(i.e. January 2000, January 2001, and January 2002). Employer shall pay Employee
a cash bonus of $50,000 per installment less applicable withholdings.

         4. Extent and Place of Services. During Employee's full time employment
with  Employer,  Employee  agrees to devote  Employee's  full  business  time to
employment with Employer. Employer shall


                                       80
<PAGE>


not transfer or relocate Employee from Employer's office in New Hampshire during
the term hereof without the approval of Employee.  In the event of a relocation,
Employee  shall be entitled to receive  relocation  assistance  consistent  with
Employer's relocation policy.

         5.  Termination  of  Employment.   Employee's   employment  under  this
Employment Agreement shall not be terminated without good cause shown. Dismissal
for cause is intended to embrace intentional or grossly negligent conduct on the
part of  Employee  which is  materially  detrimental  to the  operations  and/or
reputation of Employer.  By way of illustration  such actions would include (but
would not be limited to) material  breach of Employee's  obligations  under this
Employment Agreement, and/or conviction of a crime (other than minor infractions
such as parking or similar traffic  violations),  moral turpitude and revocation
by the applicable licensing authority of professional licenses (if any) material
to Employee's ability to perform Employee's employment obligations.

         6. Covenant Not to Compete. In consideration for the hiring of Employee
by Employer  during the term of this  Agreement,  Employee  shall not render any
services  or engage in any  activities  which are  competitive  with  Employer's
activities in any other state in which Employer conducts business.  In the event
of  any  breach  of the  foregoing  covenant,  the  Employee  acknowledges  that
Employer's  remedies at law will be inadequate and Employer shall be entitled to
seek  injunctive  relief,  as well as any rights  Employer may have at law or in
equity, including any rights regarding the misuse of confidential or proprietary
information.

         7.  Confidentiality.  Employee  agrees  to  keep  confidential  and not
disclose  or make any use of any  confidential  or  proprietary  information  of
EMCON,  except for EMCON's  benefit,  at any time either during or subsequent to
Employee's employment. Confidential or proprietary information is subject matter
pertaining  to any  business of EMCON or any of their  clients,  consultants  or
affiliates  which  Employee  may produce,  obtain,  become aware of or otherwise
acquire during the course of employment which is not public knowledge.

         8.       Miscellaneous.

                  (a) This Agreement and each of its provisions shall be binding
upon and  inure to the  benefit  of the  parties  hereto  and  their  respective
successors, representatives, and assigns.

                  (b) This  Agreement  shall be  governed  by and  construed  in
accordance  with the laws of the State of  Delaware  as applied to  transactions
between Delaware residents wholly within the State of Delaware. If any provision
of the Agreement is held invalid or  unenforceable  for any reason,  the parties
hereto agree that such  invalidity  will not affect the remaining  provisions of
this Agreement.

                  (c) This Agreement  constitutes the entire  Agreement  between
the parties with respect to the subject  matter hereof and it hereby  supersedes
any and all prior agreements or understandings  between the parties with respect
to such subject  matter.  This Agreement may not be amended or changed except by
an instrument in writing signed by the parties hereto.

                  (d)  This   Agreement   may  be   executed   in  one  or  more
counterparts,  each of which shall be an original  instrument,  but all of which
together shall constitute one and the same instrument.

                  (e) The  headings of this  Agreement  have been  inserted  for
convenience of reference  only and shall in no way restrict or otherwise  modify
any of the terms or provisions hereof.


                                       81
<PAGE>



         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as
of the day and year first above written.

EMPLOYER:                                              EMPLOYEE:
EMCON, a California corporation

By: /s/ Eugene M. Herson                               /s/ Gerard Ridzon 
- - -------------------------                              ----------------- 
Title: President & Chief Executive Officer                 Gerard Ridzon





                                       82



                                  EXHIBIT 10.33

                              AMENDMENT NO. 1998-1
                                       TO
                                      EMCON
                           DEFERRED COMPENSATION PLAN


                  EMCON, a California  corporation (the "Company"),  pursuant to
the power granted to it by Section 11.2 of the EMCON Deferred Compensation Plan,
dated as of August 1, 1997,  as amended  January  1, 1998 (the  "Plan"),  hereby
further amends the Plan, as follows, effective as of January 1, 1999:

1.   The first two sentences of Section 4.1 are hereby amended in their entirety
     to read as follows:


         "Each Plan  Year,  a  Participant  may  irrevocably  elect to receive a
         future  "Short-Term  Payout"  from the Plan with  respect  to such Plan
         Year's Annual Deferral Amount and  Discretionary  Company  Contribution
         Amount.  Subject to the Deduction  Limitation,  the  Short-Term  Payout
         shall be a lump sum  payment  in an amount  that is equal to the Annual
         Deferral Amount and the Discretionary  Company  Contribution Amount for
         such Plan Year, plus amounts  credited or debited thereon in the manner
         provided  in  Section  3.5  above,  determined  at the  time  that  the
         Short-Term   Payout  becomes   payable  (rather  than  the  date  of  a
         Termination of Employment)."


         The  Company  has  caused  this  Amendment  to be  signed  by its  duly
authorized officer as of the 12th day of November, 1998.


                                EMCON


                              By:    /s/ R. Michael Momboisse 
                              ---------------------------------------------- 
                              R. Michael Momboisse
                              Chief Financial Officer - Vice President Legal




                                       83




                                  EXHIBIT 10.34

                                EIGHTH AMENDMENT
                               TO CREDIT AGREEMENT

THIS EIGHTH AMENDMENT TO CREDIT AGREEMENT (this "Eighth  Amendment") dated as of
November 30, 1998, is made and entered into by and between  EMCON,  a California
Corporation ("Borrower"), and UNION BANK OF CALIFORNIA, N.A. ("Bank"), successor
in interest to the Bank of California, N.A.

                                    RECITALS:

A.       Borrower and Bank are parties to that certain  Credit  Agreement  dated
         February  29,  1996 as  amended  from time to time  (the  "Agreement"),
         pursuant to which Bank agreed to extend credit to Borrower.

B.       Borrower  is  currently  indebted  to Bank under the  Agreement  in the
         aggregate commitment amount of $13,785,713 and Borrower has no defense,
         offset or counterclaim  against Bank or any other person or entity that
         diminishes such indebtedness.

Now,  therefore,  in  consideration  of the  above  recitals  and of the  mutual
covenants and conditions contained herein, Borrower and Bank agree as follows:

                                   AGREEMENT:

1.       Defined  Terms.  Initially capitalized  terms used herein which are not
         otherwise  defined  shall have  the  meanings  assigned thereto in  the
         Agreement.

2.       Amendments to the Agreement.

         (a) In ARTICLE 1 -  DEFINITIONS,  "Termination  Date" is amended in its
entirety to read as follows:

                  ""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) December  31, 1998 for the Line of Credit;  or (c) June
30, 2001 for the Term Loan."

3.       Effectiveness  of the Eighth  amendment.  This Eighth  Amendment  shall
         become  effective as of the date hereof when, and only when, Bank shall
         have received all of the following,  in form and substance satisfactory
         to Bank:

         (a)  The  counterpart  of this  Seventh  Amendment,  duly  executed  by
Borrower;

         (b)  Such  other  documents,  instruments  or  agreements  as Bank  may
reasonably deem necessary.

4.       Ratification. Except as specifically amended hereinabove, the Agreement
         shall  remain in full  force and  effect  and is  hereby  ratified  and
         confirmed.


                                       84
<PAGE>


5. Representations and Warranties. Borrower represents and warrants as follows:

         (a)  Each  of  the  representations  and  warranties  contained  in the
         Agreement,  as may be amended  hereby,  is hereby  reaffirmed as of the
         date hereof, each as if set forth herein:

         (b) The executive, delivery and performance of the Eighth Amendment and
         any other  instruments  or documents in connection  herewith are within
         Borrower's  power,  have been duly  authorized,  are  legal,  valid and
         binding obligations of Borrower, and are not in conflict with the terms
         of any charter, bylaw, or other organization papers of Borrower or with
         any law,  indenture,  agreement or  undertaking  to which Borrower is a
         party or by which Borrower is bound or affected;

         (c) No event has occurred and is  continuing  or would result from this
         Eighth  Amendment  which  constitutes  or would  constitute an Event of
         Default under the Agreement.

6.       Governing  Law.  This Eighth  Amendment  and all other  instruments  or
         documents in  connection  herewith  shall be governed by and  construed
         according to the laws of the State of California.

7.       Counterparts.  This  Eighth  Amendment  may be  executed in two or more
         counterparts,  each of which  shall be  deemed an  original  and all of
         which together shall constitute one and the same instrument.


WITNESS the due execution hereof as of the date first above written.

UNION BANK OF CALIFORNIA, N.A.                  EMCON


By:  /s/  David Jackson                         By:  /s/ Eugene M. Herson  
- - --------------------------                      -----------------------------
Title:  Vice President                          Title:  CFO & President 



                                                By:  /s/  R. Mike Momboisse 
                                                -----------------------------
                                                Title:  CFO and VP Legal  



                                       85
<PAGE>

                                 PROMISSORY NOTE
                                   (BASE RATE)


Borrower Name:  EMCON

Borrower Address:                         Office  70061
400 SOUTH EL CAMINO  REAL,  STE 1200      Loan Number  259-668-7520  0081-00-000
SAN MATEO, CA 94402                       Maturity Date DECEMBER 31, 1998
                                          Amount  $10,000,000.00

$10,000,000.00                            Date  NOVEMBER 30, 1998
- - --------------                            -----------------------

FOR VALUE RECEIVED, on DECEMBER 31, 1998, the undersigned ("Debtor") promises to
pay to the order of UNION BANK OF CALIFORNIA, N.A. ("Bank"), as indicated below,
the principal sum of TEN MILLION AND NO/100 Dollars ($10,000,000.00), or so much
thereof as is disbursed, together with interest on the balance of such principal
from time to time  outstanding,  at the per annum rate or rates and at the times
set forth below.

1. INTEREST PAYMENTS. Debtor shall pay interest at maturity. Should interest not
be paid when due, it shall become a part of the  principal  and bear interest as
herein  provided.  All computations of interest under this note shall be made on
the basis of a year of 360 days, for actual days elapsed.

         a.  BASE  INTEREST  RATE.  At  Debtor's  option,   amounts  outstanding
         hereunder  in  minimum  amounts  of at  least  $100,000.00  shall  bear
         interest  at a rate,  based on an index  selected  by Debtor,  which is
         1.50% per annum in excess of Bank's  LIBOR-Rate for the Interest Period
         selected by Debtor, acceptable to Bank.

         No Base  Interest  Rate may be changed,  altered or otherwise  modified
         until the  expiration of the Interest  Period  selected by Debtor.  The
         exercise of  interest  rate  options by Debtor  shall be as recorded in
         Bank's  records,  which  records  shall be prima facie  evidence of the
         amount  borrowed  under either  interest  option and the interest rate;
         provided,  however,  that failure of Bank to make any such  notation in
         its records shall not discharge  Debtor from it obligations to repay in
         full with interest all amounts borrowed. In no event shall any Interest
         Period extend beyond the maturity date of this note.

         To exercise this option,  Debtor may, from time to time with respect to
         principal  outstanding  on which a Base  Interest Rate is not accruing,
         and on the expiration of any Interest  Period with respect to principal
         outstanding  on which a Base Interest Rate has been accruing  select an
         index  offered by Bank for a Base  Interest  Rate Loan and an  Interest
         Period by telephoning an authorized  lending officer of Bank located at
         the banking office identified below prior to 10:00 a.m.,  Pacific time,
         on any Business Day and  advising  that officer of the selected  index,
         the  Interest   Period  and  the   Origination   Date  selected  (which
         Origination   Date,  for  a  Base  Interest  Rate  Loan  based  on  the
         LIBOR-Rate, shall follow the date of such selection by no more than two
         (2) Business Days).

         Bank will mail a written  confirmation of the terms of the selection to
         Debtor  promptly  after the  selection  is made.  Failure  to send such
         confirmation  shall not affect Bank's rights to collect  interest at at
         the rate selected. If, on the date of the selection, the index selected
         is  unavailable  for any  reason,  the  selection  shall be void.  Bank
         reserves  the  right to fund the  principal  from any  source  of funds
         notwithstanding any Base Interest Rate selected by Debtor.

         b. VARIABLE INTEREST RATE. All principal outstanding hereunder which is
         not bearing  interest at a Base  Interest Rate shall bear interest at a
         rate per annum of equal to the Reference Rate, which rate shall vary as
         and when the Reference Rate changes.

         At any  time  prior  to the  maturity  of  this  note,  subject  to the
         provisions  of  paragraph  4, below,  of this note,  Debtor may borrow,
         repay and reborrow  hereon so long as the total  outstanding at any one
         time does not exceed the  principal  amount of this note.  Debtor shall
         pay any  amounts  due under  this note in  lawful  money of the  United
         States at Bank's NORTHERN CALIFORNIA COMMERCIAL BANKING Office, or such
         other office as may be designated by Bank, from time to time.

2.       LATE  PAYMENTS.  If any  payment  required by the terms of this note
shall  remain  unpaid ten days after same is due, at the option of Bank,  Debtor
shall pay a fee of $100 to Bank.


                                       86
<PAGE>
3.       INTEREST RATE  FOLLOWING  DEFAULT.  In the event of default,  at the
option of Bank, and, to the extend  permitted by law,  interest shall be payable
on the  outstanding  principal under this note at a per annum rate equal to five
percent (5%) in excess of the interest rate specified in paragraph 1.b.,  above,
calculated  from the date of default  until all amounts  payable under this note
are paid in full.

4.       PREPAYMENT.

         a. Amounts outstanding under this note bearing interest at a rate based
         on the  Reference  Rate may be prepaid in whole or in part at any time,
         without penalty or premium. Debtor may prepay amounts outstanding under
         this note bearing  interest at a Base Interest Rate in whole or in part
         provided  Debtor  has given Bank not less than five (5)  Business  Days
         prior written notice of Debtor's  intention to make such prepayment and
         pays to Bank the liquidated damages due as a result. Liquidated Damages
         shall  also  be  paid,  if  Bank,  for  any  other  reason,   including
         acceleration or  foreclosure,  receives all or any portion of principal
         bearing interest at a Base Interest Rate prior to its scheduled payment
         date.  Liquidated Damages shall be an amount equal to the present value
         of the product of: (i) the difference  (but not less than zero) between
         (a) the Base Interest Rate applicable to the principal  amount which is
         being  prepaid,  and (b) the return  which Bank could obtain if it used
         the amount of such  prepayment  of  principal  to purchase at bid price
         regularly  quoted  securities  issued  by the  United  State  having  a
         maturity  date most  closely  coinciding  with the  relevant  Base Rate
         Maturity Date and such  securities were held by Bank until the relevant
         Base Rate Maturity Date ("Yield Rate"); (ii) a fraction,  the numerator
         of  which  is the  number  of days in the  period  between  the date of
         prepayment and the relevant Base Rate Maturity Date and the denominator
         of which is 360;  and (iii)  the  amount of the  principal  so  prepaid
         (except in the event that  principal  payments are scheduled  under the
         terms of the Base  Interest  Rate Loan  being  prepaid,  then an amount
         equal to the lesser of (A) the amount  prepaid or (B) 50% of the sum of
         (1) the amount prepaid and (2) the amount of principal  scheduled under
         the  terms  of  the  Base  Interest  Rate  Loan  being  prepaid  to  be
         outstanding  at the relevant  Base Rate Maturity  Date).  Present value
         under  this note is  determined  by  discounting  the above  product to
         present value using the Yield Rate as the annual discount factor.

         b. In no event shall Bank be obligated to make any payment or refund to
         Debtor,  nor shall  Debtor be  entitled  to any  setoff or other  claim
         against  bank,  should the return  which Bank could  obtain  under this
         prepayment formula exceed the interest that Bank would have received if
         no prepayment had occurred.  All  prepayments  shall include payment of
         accrued  interest  on the  principal  amount  so  prepaid  and shall be
         applied to payment of  interest  before  application  to  principal.  A
         determination by Bank as to the prepayment fee amount, if any, shall be
         conclusive.

         c. Bank shall  provide  Debtor a  statement  of the  amount  payable on
         account of prepayment.  Debtor acknowledges that (i) Bank establishes a
         Base  Interest  Rate upon the  understanding  that it apply to the Base
         Interest  Rate  Loan  for the  entire  Interest  Period,  and  (ii) any
         prepayment may result in Bank incurring  additional costs,  expenses or
         liabilities;  and Debtor  agrees to pay these  liquidated  damages as a
         reasonable  estimate of the costs,  expenses  and  liabilities  of Bank
         associated with such prepayment.

5.       DEFAULT AND ACCELERATION OF TIME FOR PAYMENT.  Default  shall  include,
but not be limited to, any of the  following:  (a) the failure of Debtor to make
any payment required under this note when due; (b) any breach, misrepresentation
or other default by Debtor, any guarantor,  co-maker endorser,  or any person or
entity  other  than  Debtor  providing   security  for  this  note  (hereinafter
individually and  collectively  referred to as the "Obligor") under any security
agreement,  guaranty or other  agreement  between Bank and any obligor;  (c) the
insolvency  of any Obligor or the failure of any Obligor  generally  to pay such
Obligor's debts as such debts become due; (d) the commencement as to any Obligor
of  any  voluntary  or  involuntary   proceeding  under  any  laws  relating  to
bankruptcy, insolvency,  reorganization,  arrangement, debt adjustment or debtor
relief;  (e) the  assignment  by any Obligor  for the benefit of such  Obligor's
creditors;  (f) the  appointment,  or  commencement  of any  proceeding  for the
appointment  of a receiver,  trustee,  custodian or similar  official for all or
substantially  all  of any  Obligor's  property;  (g)  the  commencement  of any
proceeding  for  the  dissolution  or  liquidation  of  any  Obligor;   (h)  the
termination  of  existence or death of any Obligor;  (i) the  revocation  of any
guaranty or subordination  agreement given in connection with this note; (j) the
failure of any Obligor to comply with any order, judgment,  injunction,  decree,
writ or  demand  of any  court or other  public  authority;  (k) the  filing  or
recording against any Obligor,  or the property of any Obligor, of any notice or
levy,  notice to withhold,  or other legal process for taxes other than property
taxes;  (l) the  default  by any  obligor  personally  liable for  amounts  owed
hereunder on any obligation  concerning the borrowing of money; (m) the issuance
against any Obligor,  or the property of any Obligor, of any writ of attachment,
execution,  or other  judicial lien; or (n) the  deterioration  of the financial
condition of any Obligor  which  results in Bank  deeming  itself in good faith,
insecure. Upon the occurrence of any such default, Bank, in its discretion,  may
cease to advance funds hereunder and may declare 

                                       87
<PAGE>
all obligations under this note immediately due and payable;  however,  upon the
occurrence  of an  event of  default  under  d, e, f, or g,  all  principal  and
interest shall automatically become immediately due and payable.

6.        ADDITIONAL  AGREEMENTS  OF DEBTOR.  If  any  amounts  owing under this
note are not paid  when due,  Debtor  promises  to pay all  costs and  expenses,
including  reasonable  attorneys'  fees,  incurred by Bank in the  collection or
enforcement of this note.  Debtor and any endorsers of this note for the maximum
period  of time and the full  extent  permitted  by law,  (a)  waive  diligence,
presentment,  demand,  notice of  nonpayment,  protest,  notice of protest,  and
notice of every  kind;  (b) waive the right to assert the defense of any statute
of limitations to any debt or obligation hereunder;  and (c) consent to renewals
and  extensions  of time for the payment of any amounts due under this note.  If
this note is signed by more than one party,  the term "Debtor"  includes each of
the undersigned and any successors in interest  thereof;  all of whose liability
shall be joint and several.  Any married  person who signs this note agrees that
recourse  may be had  against  the  separate  property  of that  person  for any
obligations  hereunder.  The  receipt  of any check or other  item of payment by
Bank,  at its option,  shall not be  considered a payment on account  until such
check or other  item of payment is honored  when  presented  for  payment at the
drawee  bank.  Bank may  delay the  credit of such  payment  based  upon  Bank's
schedule of funds availability,  and interest under this note shall accrue until
the funds are deemed  collected.  In any action  brought under or arising out of
this note,  Debtor and any  Obligor,  including  their  successors  and assigns,
hereby consent to the  jurisdiction  of any competent  court within the State of
California, as provided in any alternative dispute resolution agreement executed
between  Debtor  and Bank,  and  consent  to  service  of  process  by any means
authorized by said state's law. The term "Bank"  includes,  without  limitation,
any holder of this note.  This note shall be  construed in  accordance  with and
governed by the laws of the State of California.  This note hereby  incorporates
any  alternative  dispute  resolution  agreement  previously,   concurrently  or
hereafter executed between Debtor and Bank.

7.        DEFINITIONS.  As used herein,  the  following  terms shall have the
meanings  respectively  set forth below:  "Base  Interest  Rate" means a rate of
interest  based on the  LIBOR-Rate.  "Base  Interest  Rate Loan"  means  amounts
outstanding  under this note that bear interest at a Base Interest  Rate.  "Base
Rate  Maturity  Date" means the last day of the Interest  Period with respect to
principal  outstanding  under a Base Interest Rate Loan.  "Business Day" means a
day on which Bank is open for business for the funding of corporate loans,  and,
with respect to the rate of interest  based on the LIBOR Rate, on which dealings
in U.S. dollar deposits  outside of the United States may be carried on by Bank.
"Interest  Period" means with respect to funds bearing  interest at a rate based
on the LIBOR  Rate,  any  calendar  period of one,  three,  six,  nine or twelve
months. In determining an Interest Period, a month means a period that starts on
one  Business  Day in a month and ends on and  includes  the day  preceding  the
numerically corresponding day in the next month. For any month in which there is
no such numerically  corresponding day, then as to that month, such day shall be
deemed to be the last  calendar  day of such month.  Any  Interest  Period which
would  otherwise  an on a  non-Business  Day  shall  end on the next  succeeding
Business  Day  unless  that is the first  day of a month,  in which  event  such
Interest Period shall end on the next preceding Business Day. "LIBOR Rate" means
a per annum rate of interest (rounded upward, if necessary, to the nearest 1/100
of 1%) at which dollar  deposits,  in immediately  available funds and in lawful
money of the United Sates would be offered to Bank, outside of the United Sates,
for a term  coinciding  with the Interest  Period  selected by Debtor and for an
amount  equal to the amount of  principal  covered  by  Debtors'  interest  rate
selection,   plus  Bank's  costs,  including  the  costs,  if  any,  of  reserve
requirements.  "Origination  Date" means the first day of the  Interest  Period.
"Reference  Rate"  means  the rate  announced  by Bank  from time to time at its
corporate  headquarters  as its Reference  Rate.  The Reference Rate is an index
rate  determined  by Bank  from  time to time  as a  means  of  pricing  certain
extensions  of credit  and is  neither  directly  tied to any  external  rate of
interest  or index nor  necessarily  the lowest  rate of  interest  or index nor
necessarily the lowest rate of interest charged by Bank at any given time.

EMCON             

By:  /s/  Eugene M. Herson                           
- - -------------------------------
Title:  CFO and President                            

By:  /s/ R. Michael Momboisse                        
- - -------------------------------
Title:  CFO and VP Legal           
                  
                                       88



                                  EXHIBIT 10.35

                                 NINTH AMENDMENT
                               TO CREDIT AGREEMENT

THIS NINTH AMENDMENT TO CREDIT  AGREEMENT (this "Ninth  Amendment")  dated as of
December 22, 1998, is made and entered into by and between  EMCON,  a California
Corporation ("Borrower"), and UNION BANK OF CALIFORNIA, N.A. ("Bank"), successor
in interest to the Bank of California, N.A.

                                    RECITALS:

A.       Borrower and Bank are parties to that certain  Credit  Agreement  dated
         February  29,  1996 as  amended  from time to time  (the  "Agreement"),
         pursuant to which Bank agreed to extend credit to Borrower.

B.       Borrower  is  currently  indebted  to Bank under the  Agreement  in the
         aggregate commitment amount of $13,785,713 and Borrower has no defense,
         offset or counterclaim  against Bank or any other person or entity that
         diminishes such indebtedness.

Now,  therefore,  in  consideration  of the  above  recitals  and of the  mutual
covenants and conditions contained herein, Borrower and Bank agree as follows:

                                   AGREEMENT:

1.        Defined Terms.  Initially  capitalized terms used herein which are not
          otherwise  defined  shall have the  meanings  assigned  thereto in the
          Agreement.

2.       Amendments to the Agreement.

         (a) In ARTICLE 1 -  DEFINITIONS,  "Termination  Date" is amended in its
entirety to read as follows:

                  ""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) February 1, 1999,  for the Line of Credit;  or (c) June
30, 2001 for the Term Loan."

3.       Effectiveness of the Ninth amendment. This Ninth Amendment shall become
         effective  as of the date hereof when,  and only when,  Bank shall have
         received all of the following,  in form and substance  satisfactory  to
         Bank:

         (a)   The  counterpart  of  this  Ninth  Amendment,  duly  executed  by
          Borrower;

         (b)  Such  other  documents,  instruments  or  agreements  as Bank  may
reasonably deem necessary.

4.       Ratification. Except as specifically amended hereinabove, the Agreement
         shall  remain in full  force and  effect  and is  hereby  ratified  and
         confirmed.


                                       89
<PAGE>



5. Representations and Warranties. Borrower represents and warrants as follows:

         (a)  Each  of  the  representations  and  warranties  contained  in the
         Agreement,  as may be amended  hereby,  is hereby  reaffirmed as of the
         date hereof, each as if set forth herein:

         (b) The executive,  delivery and performance of the Ninth Amendment and
         any other  instruments  or documents in connection  herewith are within
         Borrower's  power,  have been duly  authorized,  are  legal,  valid and
         binding obligations of Borrower, and are not in conflict with the terms
         of any charter, bylaw, or other organization papers of Borrower or with
         any law,  indenture,  agreement or  undertaking  to which Borrower is a
         party or by which Borrower is bound or affected;

         (c) No event has occurred and is  continuing  or would result from this
         Ninth  Amendment  which  constitutes  or would  constitute  an Event of
         Default under the Agreement.

6.       Governing  Law.  This  Ninth  Amendment  and all other  instruments  or
         documents in  connection  herewith  shall be governed by and  construed
         according to the laws of the State of California.

7.       Counterparts.  This  Ninth  Amendment  may be  executed  in two or more
         counterparts,  each of which  shall be  deemed an  original  and all of
         which together shall constitute one and the same instrument.


WITNESS the due execution hereof as of the date first above written.

UNION BANK OF CALIFORNIA, N.A.                      EMCON


By:  /s/  David Jackson                             By:  /s/ Eugene M. Herson
- - -------------------------                           ----------------------------
Title:  Vice President                              Title:  CFO & President 



                                                    By:  /s/  R. Mike Momboisse
                                                    ----------------------------
                                                    Title:  CFO and VP Legal 



                                       90
<PAGE>

                                 PROMISSORY NOTE
                                   (BASE RATE)


Borrower Name:  EMCON

Borrower Address:                         Office  70061
400 SOUTH EL CAMINO  REAL,  STE 1200      Loan Number  259-668-7520  0081-00-000
SAN MATEO, CA 94402                       Maturity Date FEBRUARY 1, 1999
                                          Amount  $10,000,000.00

$10,000,000.00                            Date  DECEMBER 31, 1998
- - --------------                            -----------------------

FOR VALUE RECEIVED, on FEBRUARY 1, 1999, the undersigned  ("Debtor") promises to
pay to the order of UNION BANK OF CALIFORNIA, N.A. ("Bank"), as indicated below,
the principal sum of TEN MILLION AND NO/100 Dollars ($10,000,000.00), or so much
thereof as is disbursed, together with interest on the balance of such principal
from time to time  outstanding,  at the per annum rate or rates and at the times
set forth below.

1. INTEREST PAYMENTS. Debtor shall pay interest at maturity. Should interest not
be paid when due, it shall become a part of the  principal  and bear interest as
herein  provided.  All computations of interest under this note shall be made on
the basis of a year of 360 days, for actual days elapsed.

         a.  BASE  INTEREST  RATE.  At  Debtor's  option,   amounts  outstanding
         hereunder  in  minimum  amounts  of at  least  $100,000.00  shall  bear
         interest  at a rate,  based on an index  selected  by Debtor,  which is
         1.50% per annum in excess of Bank's  LIBOR-Rate for the Interest Period
         selected by Debtor, acceptable to Bank.

         No Base  Interest  Rate may be changed,  altered or otherwise  modified
         until the  expiration of the Interest  Period  selected by Debtor.  The
         exercise of  interest  rate  options by Debtor  shall be as recorded in
         Bank's  records,  which  records  shall be prima facie  evidence of the
         amount  borrowed  under either  interest  option and the interest rate;
         provided,  however,  that failure of Bank to make any such  notation in
         its records shall not discharge  Debtor from it obligations to repay in
         full with interest all amounts borrowed. In no event shall any Interest
         Period extend beyond the maturity date of this note.

         To exercise this option,  Debtor may, from time to time with respect to
         principal  outstanding  on which a Base  Interest Rate is not accruing,
         and on the expiration of any Interest  Period with respect to principal
         outstanding  on which a Base Interest Rate has been accruing  select an
         index  offered by Bank for a Base  Interest  Rate Loan and an  Interest
         Period by telephoning an authorized  lending officer of Bank located at
         the banking office identified below prior to 10:00 a.m.,  Pacific time,
         on any Business Day and  advising  that officer of the selected  index,
         the  Interest   Period  and  the   Origination   Date  selected  (which
         Origination   Date,  for  a  Base  Interest  Rate  Loan  based  on  the
         LIBOR-Rate, shall follow the date of such selection by no more than two
         (2) Business Days).

         Bank will mail a written  confirmation of the terms of the selection to
         Debtor  promptly  after the  selection  is made.  Failure  to send such
         confirmation  shall not affect Bank's rights to collect  interest at at
         the rate selected. If, on the date of the selection, the index selected
         is  unavailable  for any  reason,  the  selection  shall be void.  Bank
         reserves  the  right to fund the  principal  from any  source  of funds
         notwithstanding any Base Interest Rate selected by Debtor.

         b. VARIABLE INTEREST RATE. All principal outstanding hereunder which is
         not bearing  interest at a Base  Interest Rate shall bear interest at a
         rate per annum of equal to the Reference Rate, which rate shall vary as
         and when the Reference Rate changes.

         At any  time  prior  to the  maturity  of  this  note,  subject  to the
         provisions  of  paragraph  4, below,  of this note,  Debtor may borrow,
         repay and reborrow  hereon so long as the total  outstanding at any one
         time does not exceed the  principal  amount of this note.  Debtor shall
         pay any  amounts  due under  this note in  lawful  money of the  United
         States at Bank's NORTHERN CALIFORNIA COMMERCIAL BANKING Office, or such
         other office as may be designated by Bank, from time to time.

2.       LATE  PAYMENTS.  If any  payment  required by the terms of this note
shall  remain  unpaid ten days after same is due, at the option of Bank,  Debtor
shall pay a fee of $100 to Bank.


                                       91
<PAGE>
3.       INTEREST RATE  FOLLOWING  DEFAULT.  In the event of default,  at the
option of Bank, and, to the extend  permitted by law,  interest shall be payable
on the  outstanding  principal under this note at a per annum rate equal to five
percent (5%) in excess of the interest rate specified in paragraph 1.b.,  above,
calculated  from the date of default  until all amounts  payable under this note
are paid in full.

4.       PREPAYMENT.

         a. Amounts outstanding under this note bearing interest at a rate based
         on the  Reference  Rate may be prepaid in whole or in part at any time,
         without penalty or premium. Debtor may prepay amounts outstanding under
         this note bearing  interest at a Base Interest Rate in whole or in part
         provided  Debtor  has given Bank not less than five (5)  Business  Days
         prior written notice of Debtor's  intention to make such prepayment and
         pays to Bank the liquidated damages due as a result. Liquidated Damages
         shall  also  be  paid,  if  Bank,  for  any  other  reason,   including
         acceleration or  foreclosure,  receives all or any portion of principal
         bearing interest at a Base Interest Rate prior to its scheduled payment
         date.  Liquidated Damages shall be an amount equal to the present value
         of the product of: (i) the difference  (but not less than zero) between
         (a) the Base Interest Rate applicable to the principal  amount which is
         being  prepaid,  and (b) the return  which Bank could obtain if it used
         the amount of such  prepayment  of  principal  to purchase at bid price
         regularly  quoted  securities  issued  by the  United  State  having  a
         maturity  date most  closely  coinciding  with the  relevant  Base Rate
         Maturity Date and such  securities were held by Bank until the relevant
         Base Rate Maturity Date ("Yield Rate"); (ii) a fraction,  the numerator
         of  which  is the  number  of days in the  period  between  the date of
         prepayment and the relevant Base Rate Maturity Date and the denominator
         of which is 360;  and (iii)  the  amount of the  principal  so  prepaid
         (except in the event that  principal  payments are scheduled  under the
         terms of the Base  Interest  Rate Loan  being  prepaid,  then an amount
         equal to the lesser of (A) the amount  prepaid or (B) 50% of the sum of
         (1) the amount prepaid and (2) the amount of principal  scheduled under
         the  terms  of  the  Base  Interest  Rate  Loan  being  prepaid  to  be
         outstanding  at the relevant  Base Rate Maturity  Date).  Present value
         under  this note is  determined  by  discounting  the above  product to
         present value using the Yield Rate as the annual discount factor.

         b. In no event shall Bank be obligated to make any payment or refund to
         Debtor,  nor shall  Debtor be  entitled  to any  setoff or other  claim
         against  bank,  should the return  which Bank could  obtain  under this
         prepayment formula exceed the interest that Bank would have received if
         no prepayment had occurred.  All  prepayments  shall include payment of
         accrued  interest  on the  principal  amount  so  prepaid  and shall be
         applied to payment of  interest  before  application  to  principal.  A
         determination by Bank as to the prepayment fee amount, if any, shall be
         conclusive.

         c. Bank shall  provide  Debtor a  statement  of the  amount  payable on
         account of prepayment.  Debtor acknowledges that (i) Bank establishes a
         Base  Interest  Rate upon the  understanding  that it apply to the Base
         Interest  Rate  Loan  for the  entire  Interest  Period,  and  (ii) any
         prepayment may result in Bank incurring  additional costs,  expenses or
         liabilities;  and Debtor  agrees to pay these  liquidated  damages as a
         reasonable  estimate of the costs,  expenses  and  liabilities  of Bank
         associated with such prepayment.

5.       DEFAULT AND ACCELERATION OF TIME FOR PAYMENT.  Default  shall  include,
but not be limited to, any of the  following:  (a) the failure of Debtor to make
any payment required under this note when due; (b) any breach, misrepresentation
or other default by Debtor, any guarantor,  co-maker endorser,  or any person or
entity  other  than  Debtor  providing   security  for  this  note  (hereinafter
individually and  collectively  referred to as the "Obligor") under any security
agreement,  guaranty or other  agreement  between Bank and any obligor;  (c) the
insolvency  of any Obligor or the failure of any Obligor  generally  to pay such
Obligor's debts as such debts become due; (d) the commencement as to any Obligor
of  any  voluntary  or  involuntary   proceeding  under  any  laws  relating  to
bankruptcy, insolvency,  reorganization,  arrangement, debt adjustment or debtor
relief;  (e) the  assignment  by any Obligor  for the benefit of such  Obligor's
creditors;  (f) the  appointment,  or  commencement  of any  proceeding  for the
appointment  of a receiver,  trustee,  custodian or similar  official for all or
substantially  all  of any  Obligor's  property;  (g)  the  commencement  of any
proceeding  for  the  dissolution  or  liquidation  of  any  Obligor;   (h)  the
termination  of  existence or death of any Obligor;  (i) the  revocation  of any
guaranty or subordination  agreement given in connection with this note; (j) the
failure of any Obligor to comply with any order, judgment,  injunction,  decree,
writ or  demand  of any  court or other  public  authority;  (k) the  filing  or
recording against any Obligor,  or the property of any Obligor, of any notice or
levy,  notice to withhold,  or other legal process for taxes other than property
taxes;  (l) the  default  by any  obligor  personally  liable for  amounts  owed
hereunder on any obligation  concerning the borrowing of money; (m) the issuance
against any Obligor,  or the property of any Obligor, of any writ of attachment,
execution,  or other  judicial lien; or (n) the  deterioration  of the financial
condition of any Obligor  which  results in Bank  deeming  itself in good faith,
insecure. Upon the occurrence of any such default, Bank, in its discretion,  may
cease to advance funds hereunder and may declare 

                                       92
<PAGE>

all obligations under this note immediately due and payable;  however,  upon the
occurrence  of an  event of  default  under  d, e, f, or g,  all  principal  and
interest shall automatically become immediately due and payable.

6.      ADDITIONAL  AGREEMENTS  OF DEBTOR.   If  any  amounts  owing  under this
note are not paid  when due,  Debtor  promises  to pay all  costs and  expenses,
including  reasonable  attorneys'  fees,  incurred by Bank in the  collection or
enforcement of this note.  Debtor and any endorsers of this note for the maximum
period  of time and the full  extent  permitted  by law,  (a)  waive  diligence,
presentment,  demand,  notice of  nonpayment,  protest,  notice of protest,  and
notice of every  kind;  (b) waive the right to assert the defense of any statute
of limitations to any debt or obligation hereunder;  and (c) consent to renewals
and  extensions  of time for the payment of any amounts due under this note.  If
this note is signed by more than one party,  the term "Debtor"  includes each of
the undersigned and any successors in interest  thereof;  all of whose liability
shall be joint and several.  Any married  person who signs this note agrees that
recourse  may be had  against  the  separate  property  of that  person  for any
obligations  hereunder.  The  receipt  of any check or other  item of payment by
Bank,  at its option,  shall not be  considered a payment on account  until such
check or other  item of payment is honored  when  presented  for  payment at the
drawee  bank.  Bank may  delay the  credit of such  payment  based  upon  Bank's
schedule of funds availability,  and interest under this note shall accrue until
the funds are deemed  collected.  In any action  brought under or arising out of
this note,  Debtor and any  Obligor,  including  their  successors  and assigns,
hereby consent to the  jurisdiction  of any competent  court within the State of
California, as provided in any alternative dispute resolution agreement executed
between  Debtor  and Bank,  and  consent  to  service  of  process  by any means
authorized by said state's law. The term "Bank"  includes,  without  limitation,
any holder of this note.  This note shall be  construed in  accordance  with and
governed by the laws of the State of California.  This note hereby  incorporates
any  alternative  dispute  resolution  agreement  previously,   concurrently  or
hereafter executed between Debtor and Bank.

7.        DEFINITIONS.  As  used  herein,  the  following  terms shall have  the
meanings  respectively  set forth below:  "Base  Interest  Rate" means a rate of
interest  based on the  LIBOR-Rate.  "Base  Interest  Rate Loan"  means  amounts
outstanding  under this note that bear interest at a Base Interest  Rate.  "Base
Rate  Maturity  Date" means the last day of the Interest  Period with respect to
principal  outstanding  under a Base Interest Rate Loan.  "Business Day" means a
day on which Bank is open for business for the funding of corporate loans,  and,
with respect to the rate of interest  based on the LIBOR Rate, on which dealings
in U.S. dollar deposits  outside of the United States may be carried on by Bank.
"Interest  Period" means with respect to funds bearing  interest at a rate based
on the LIBOR  Rate,  any  calendar  period of one,  three,  six,  nine or twelve
months. In determining an Interest Period, a month means a period that starts on
one  Business  Day in a month and ends on and  includes  the day  preceding  the
numerically corresponding day in the next month. For any month in which there is
no such numerically  corresponding day, then as to that month, such day shall be
deemed to be the last  calendar  day of such month.  Any  Interest  Period which
would  otherwise  an on a  non-Business  Day  shall  end on the next  succeeding
Business  Day  unless  that is the first  day of a month,  in which  event  such
Interest Period shall end on the next preceding Business Day. "LIBOR Rate" means
a per annum rate of interest (rounded upward, if necessary, to the nearest 1/100
of 1%) at which dollar  deposits,  in immediately  available funds and in lawful
money of the United Sates would be offered to Bank, outside of the United Sates,
for a term  coinciding  with the Interest  Period  selected by Debtor and for an
amount  equal to the amount of  principal  covered  by  Debtors'  interest  rate
selection,   plus  Bank's  costs,  including  the  costs,  if  any,  of  reserve
requirements.  "Origination  Date" means the first day of the  Interest  Period.
"Reference  Rate"  means  the rate  announced  by Bank  from time to time at its
corporate  headquarters  as its Reference  Rate.  The Reference Rate is an index
rate  determined  by Bank  from  time to time  as a  means  of  pricing  certain
extensions  of credit  and is  neither  directly  tied to any  external  rate of
interest  or index nor  necessarily  the lowest  rate of  interest  or index nor
necessarily the lowest rate of interest charged by Bank at any given time.

EMCON             

By:  /s/  Eugene M. Herson                           

Title:  CFO and President                            

By:  /s/ R. Michael Momboisse                        

Title:  CFO and VP Legal                             

                                       93



                                  EXHIBIT 10.36

                                 TENTH AMENDMENT
                               TO CREDIT AGREEMENT

THIS TENTH AMENDMENT TO CREDIT  AGREEMENT (this "Tenth  Amendment")  dated as of
January 28, 1999,  is made and entered into by and between  EMCON,  a California
Corporation ("Borrower"), and UNION BANK OF CALIFORNIA, N.A. ("Bank"), successor
in interest to the Bank of California, N.A.

                                    RECITALS:

A.       Borrower and Bank are parties to that certain  Credit  Agreement  dated
         February  29,  1996 as  amended  from time to time  (the  "Agreement"),
         pursuant to which Bank agreed to extend credit to Borrower.

B.       Borrower  is  currently  indebted  to Bank under the  Agreement  in the
         aggregate commitment amount of $13,428,570 and Borrower has no defense,
         offset or counterclaim  against Bank or any other person or entity that
         diminishes such indebtedness.

Now,  therefore,  in  consideration  of the  above  recitals  and of the  mutual
covenants and conditions contained herein, Borrower and Bank agree as follows:

                                   AGREEMENT:

1.        Defined Terms.  Initially  capitalized terms used herein which are not
          otherwise  defined  shall have the  meanings  assigned  thereto in the
          Agreement.

2.       Amendments to the Agreement.

         (a) In ARTICLE 1 -  DEFINITIONS,  "Termination  Date" is amended in its
         entirety to read as follows:

              ""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) March 19, 1999, for the Line of Credit; or
         (c) June 30, 2001 for the Term Loan."

3.       Effectiveness of the Tenth amendment. This Tenth Amendment shall become
         effective  as of the date hereof when,  and only when,  Bank shall have
         received all of the following,  in form and substance  satisfactory  to
         Bank:

         (a) The counterpart of this Tenth Amendment, duly executed by Borrower;

         (b)  Such  other  documents,  instruments  or  agreements  as Bank  may
         reasonably deem necessary.

4.       Ratification. Except as specifically amended hereinabove, the Agreement
         shall  remain in full  force and  effect  and is  hereby  ratified  and
         confirmed.


                                       94
<PAGE>


5. Representations and Warranties. Borrower represents and warrants as follows:

         (a)  Each  of  the  representations  and  warranties  contained  in the
         Agreement,  as may be amended  hereby,  is hereby  reaffirmed as of the
         date hereof, each as if set forth herein:

         (b) The executive,  delivery and performance of the Tenth Amendment and
         any other  instruments  or documents in connection  herewith are within
         Borrower's  power,  have been duly  authorized,  are  legal,  valid and
         binding obligations of Borrower, and are not in conflict with the terms
         of any charter, bylaw, or other organization papers of Borrower or with
         any law,  indenture,  agreement or  undertaking  to which Borrower is a
         party or by which Borrower is bound or affected;

         (c) No event has occurred and is  continuing  or would result from this
         Eighth  Amendment  which  constitutes  or would  constitute an Event of
         Default under the Agreement.

6.       Governing  Law.  This  Tenth  Amendment  and all other  instruments  or
         documents in  connection  herewith  shall be governed by and  construed
         according to the laws of the State of California.

7.       Counterparts.  This  Tenth  Amendment  may be  executed  in two or more
         counterparts,  each of which  shall be  deemed an  original  and all of
         which together shall constitute one and the same instrument.


WITNESS the due execution hereof as of the date first above written.

UNION BANK OF CALIFORNIA, N.A.                EMCON


By:  /s/  David Jackson                       By:  /s/ Eugene M. Herson 
- - --------------------------                    -------------------------------
Title:  Vice President                        Title:  CFO & President  



                                              By:  /s/  R. Mike Momboisse
                                              -------------------------------
                                              Title:  CFO and VP Legal  


                                       95
<PAGE>

                                 PROMISSORY NOTE
                                   (BASE RATE)


Borrower Name:  EMCON

Borrower Address:                         Office  70061
400 SOUTH EL CAMINO  REAL,  STE 1200      Loan Number  259-668-7520  0081-00-000
SAN MATEO, CA 94402                       Maturity Date MARCH 19, 1999
                                          Amount  $10,000,000.00

$10,000,000.00                            Date  JANUARY 27, 1999
- - --------------                            ----------------------

FOR VALUE RECEIVED, on MARCH 19, 1999 the undersigned ("Debtor") promises to pay
to the order of UNION BANK OF CALIFORNIA, N.A. ("Bank"), as indicated below, the
principal  sum of TEN MILLION AND NO/100  Dollars  ($10,000,000.00),  or so much
thereof as is disbursed, together with interest on the balance of such principal
from time to time  outstanding,  at the per annum rate or rates and at the times
set forth below.

1. INTEREST PAYMENTS. Debtor shall pay interest at maturity. Should interest not
be paid when due, it shall become a part of the  principal  and bear interest as
herein  provided.  All computations of interest under this note shall be made on
the basis of a year of 360 days, for actual days elapsed.

         a.  BASE  INTEREST  RATE.  At  Debtor's  option,   amounts  outstanding
         hereunder  in  minimum  amounts  of at  least  $100,000.00  shall  bear
         interest  at a rate,  based on an index  selected  by Debtor,  which is
         1.50% per annum in excess of Bank's  LIBOR-Rate for the Interest Period
         selected by Debtor, acceptable to Bank.

         No Base  Interest  Rate may be changed,  altered or otherwise  modified
         until the  expiration of the Interest  Period  selected by Debtor.  The
         exercise of  interest  rate  options by Debtor  shall be as recorded in
         Bank's  records,  which  records  shall be prima facie  evidence of the
         amount  borrowed  under either  interest  option and the interest rate;
         provided,  however,  that failure of Bank to make any such  notation in
         its records shall not discharge  Debtor from it obligations to repay in
         full with interest all amounts borrowed. In no event shall any Interest
         Period extend beyond the maturity date of this note.

         To exercise this option,  Debtor may, from time to time with respect to
         principal  outstanding  on which a Base  Interest Rate is not accruing,
         and on the expiration of any Interest  Period with respect to principal
         outstanding  on which a Base Interest Rate has been accruing  select an
         index  offered by Bank for a Base  Interest  Rate Loan and an  Interest
         Period by telephoning an authorized  lending officer of Bank located at
         the banking office identified below prior to 10:00 a.m.,  Pacific time,
         on any Business Day and  advising  that officer of the selected  index,
         the  Interest   Period  and  the   Origination   Date  selected  (which
         Origination   Date,  for  a  Base  Interest  Rate  Loan  based  on  the
         LIBOR-Rate, shall follow the date of such selection by no more than two
         (2) Business Days).

         Bank will mail a written  confirmation of the terms of the selection to
         Debtor  promptly  after the  selection  is made.  Failure  to send such
         confirmation  shall not affect Bank's rights to collect  interest at at
         the rate selected. If, on the date of the selection, the index selected
         is  unavailable  for any  reason,  the  selection  shall be void.  Bank
         reserves  the  right to fund the  principal  from any  source  of funds
         notwithstanding any Base Interest Rate selected by Debtor.

         b. VARIABLE INTEREST RATE. All principal outstanding hereunder which is
         not bearing  interest at a Base  Interest Rate shall bear interest at a
         rate per annum of equal to the Reference Rate, which rate shall vary as
         and when the Reference Rate changes.

         At any  time  prior  to the  maturity  of  this  note,  subject  to the
         provisions  of  paragraph  4, below,  of this note,  Debtor may borrow,
         repay and reborrow  hereon so long as the total  outstanding at any one
         time does not exceed the  principal  amount of this note.  Debtor shall
         pay any  amounts  due under  this note in  lawful  money of the  United
         States at Bank's NORTHERN CALIFORNIA COMMERCIAL BANKING Office, or such
         other office as may be designated by Bank, from time to time.

2.       LATE  PAYMENTS.  If any  payment  required  by  the  terms of this note
shall  remain  unpaid ten days after same is due, at the option of Bank,  Debtor
shall pay a fee of $100 to Bank.


                                       96
<PAGE>
3.       INTEREST  RATE  FOLLOWING  DEFAULT.  In  the event of default,  at  the
option of Bank, and, to the extend  permitted by law,  interest shall be payable
on the  outstanding  principal under this note at a per annum rate equal to five
percent (5%) in excess of the interest rate specified in paragraph 1.b.,  above,
calculated  from the date of default  until all amounts  payable under this note
are paid in full.

4.       PREPAYMENT.
         a. Amounts outstanding under this note bearing interest at a rate based
         on the  Reference  Rate may be prepaid in whole or in part at any time,
         without penalty or premium. Debtor may prepay amounts outstanding under
         this note bearing  interest at a Base Interest Rate in whole or in part
         provided  Debtor  has given Bank not less than five (5)  Business  Days
         prior written notice of Debtor's  intention to make such prepayment and
         pays to Bank the liquidated damages due as a result. Liquidated Damages
         shall  also  be  paid,  if  Bank,  for  any  other  reason,   including
         acceleration or  foreclosure,  receives all or any portion of principal
         bearing interest at a Base Interest Rate prior to its scheduled payment
         date.  Liquidated Damages shall be an amount equal to the present value
         of the product of: (i) the difference  (but not less than zero) between
         (a) the Base Interest Rate applicable to the principal  amount which is
         being  prepaid,  and (b) the return  which Bank could obtain if it used
         the amount of such  prepayment  of  principal  to purchase at bid price
         regularly  quoted  securities  issued  by the  United  State  having  a
         maturity  date most  closely  coinciding  with the  relevant  Base Rate
         Maturity Date and such  securities were held by Bank until the relevant
         Base Rate Maturity Date ("Yield Rate"); (ii) a fraction,  the numerator
         of  which  is the  number  of days in the  period  between  the date of
         prepayment and the relevant Base Rate Maturity Date and the denominator
         of which is 360;  and (iii)  the  amount of the  principal  so  prepaid
         (except in the event that  principal  payments are scheduled  under the
         terms of the Base  Interest  Rate Loan  being  prepaid,  then an amount
         equal to the lesser of (A) the amount  prepaid or (B) 50% of the sum of
         (1) the amount prepaid and (2) the amount of principal  scheduled under
         the  terms  of  the  Base  Interest  Rate  Loan  being  prepaid  to  be
         outstanding  at the relevant  Base Rate Maturity  Date).  Present value
         under  this note is  determined  by  discounting  the above  product to
         present value using the Yield Rate as the annual discount factor.

         b. In no event shall Bank be obligated to make any payment or refund to
         Debtor,  nor shall  Debtor be  entitled  to any  setoff or other  claim
         against  bank,  should the return  which Bank could  obtain  under this
         prepayment formula exceed the interest that Bank would have received if
         no prepayment had occurred.  All  prepayments  shall include payment of
         accrued  interest  on the  principal  amount  so  prepaid  and shall be
         applied to payment of  interest  before  application  to  principal.  A
         determination by Bank as to the prepayment fee amount, if any, shall be
         conclusive.

         c. Bank shall  provide  Debtor a  statement  of the  amount  payable on
         account of prepayment.  Debtor acknowledges that (i) Bank establishes a
         Base  Interest  Rate upon the  understanding  that it apply to the Base
         Interest  Rate  Loan  for the  entire  Interest  Period,  and  (ii) any
         prepayment may result in Bank incurring  additional costs,  expenses or
         liabilities;  and Debtor  agrees to pay these  liquidated  damages as a
         reasonable  estimate of the costs,  expenses  and  liabilities  of Bank
         associated with such prepayment.

5.       DEFAULT AND  ACCELERATION OF TIME FOR PAYMENT.  Default  shall include,
but not be limited to, any of the  following:  (a) the failure of Debtor to make
any payment required under this note when due; (b) any breach, misrepresentation
or other default by Debtor, any guarantor,  co-maker endorser,  or any person or
entity  other  than  Debtor  providing   security  for  this  note  (hereinafter
individually and  collectively  referred to as the "Obligor") under any security
agreement,  guaranty or other  agreement  between Bank and any obligor;  (c) the
insolvency  of any Obligor or the failure of any Obligor  generally  to pay such
Obligor's debts as such debts become due; (d) the commencement as to any Obligor
of  any  voluntary  or  involuntary   proceeding  under  any  laws  relating  to
bankruptcy, insolvency,  reorganization,  arrangement, debt adjustment or debtor
relief;  (e) the  assignment  by any Obligor  for the benefit of such  Obligor's
creditors;  (f) the  appointment,  or  commencement  of any  proceeding  for the
appointment  of a receiver,  trustee,  custodian or similar  official for all or
substantially  all  of any  Obligor's  property;  (g)  the  commencement  of any
proceeding  for  the  dissolution  or  liquidation  of  any  Obligor;   (h)  the
termination  of  existence or death of any Obligor;  (i) the  revocation  of any
guaranty or subordination  agreement given in connection with this note; (j) the
failure of any Obligor to comply with any order, judgment,  injunction,  decree,
writ or  demand  of any  court or other  public  authority;  (k) the  filing  or
recording against any Obligor,  or the property of any Obligor, of any notice or
levy,  notice to withhold,  or other legal process for taxes other than property
taxes;  (l) the  default  by any  obligor  personally  liable for  amounts  owed
hereunder on any obligation  concerning the borrowing of money; (m) the issuance
against any Obligor,  or the property of any Obligor, of any writ of attachment,
execution,  or other  judicial lien; or (n) the  deterioration  of the financial
condition of any Obligor  which  results in Bank  deeming  itself in good faith,
insecure. Upon the occurrence of any such default, Bank, in its discretion,  may
cease to advance funds hereunder and may declare all obligations under this note
immediately due and payable; however, upon the occurrence of an event of default
under d, e, f, or g, all  principal  and  interest  shall  automatically  become
immediately due and payable. 
                                       97
<PAGE>


6.        ADDITIONAL  AGREEMENTS  OF DEBTOR.  If any amounts owing under this
note are not paid  when due,  Debtor  promises  to pay all  costs and  expenses,
including  reasonable  attorneys'  fees,  incurred by Bank in the  collection or
enforcement of this note.  Debtor and any endorsers of this note for the maximum
period  of time and the full  extent  permitted  by law,  (a)  waive  diligence,
presentment,  demand,  notice of  nonpayment,  protest,  notice of protest,  and
notice of every  kind;  (b) waive the right to assert the defense of any statute
of limitations to any debt or obligation hereunder;  and (c) consent to renewals
and  extensions  of time for the payment of any amounts due under this note.  If
this note is signed by more than one party,  the term "Debtor"  includes each of
the undersigned and any successors in interest  thereof;  all of whose liability
shall be joint and several.  Any married  person who signs this note agrees that
recourse  may be had  against  the  separate  property  of that  person  for any
obligations  hereunder.  The  receipt  of any check or other  item of payment by
Bank,  at its option,  shall not be  considered a payment on account  until such
check or other  item of payment is honored  when  presented  for  payment at the
drawee  bank.  Bank may  delay the  credit of such  payment  based  upon  Bank's
schedule of funds availability,  and interest under this note shall accrue until
the funds are deemed  collected.  In any action  brought under or arising out of
this note,  Debtor and any  Obligor,  including  their  successors  and assigns,
hereby consent to the  jurisdiction  of any competent  court within the State of
California, as provided in any alternative dispute resolution agreement executed
between  Debtor  and Bank,  and  consent  to  service  of  process  by any means
authorized by said state's law. The term "Bank"  includes,  without  limitation,
any holder of this note.  This note shall be  construed in  accordance  with and
governed by the laws of the State of California.  This note hereby  incorporates
any  alternative  dispute  resolution  agreement  previously,   concurrently  or
hereafter executed between Debtor and Bank.

7.        DEFINITIONS.  As used herein,  the  following  terms shall have the
meanings  respectively  set forth below:  "Base  Interest  Rate" means a rate of
interest  based on the  LIBOR-Rate.  "Base  Interest  Rate Loan"  means  amounts
outstanding  under this note that bear interest at a Base Interest  Rate.  "Base
Rate  Maturity  Date" means the last day of the Interest  Period with respect to
principal  outstanding  under a Base Interest Rate Loan.  "Business Day" means a
day on which Bank is open for business for the funding of corporate loans,  and,
with respect to the rate of interest  based on the LIBOR Rate, on which dealings
in U.S. dollar deposits  outside of the United States may be carried on by Bank.
"Interest  Period" means with respect to funds bearing  interest at a rate based
on the  LIBOR  Rate,  any  calendar  period  of one,  two or  three  months.  In
determining  an  Interest  Period,  a month  means a period  that  starts on one
Business  Day in a  month  and  ends  on and  includes  the  day  preceding  the
numerically corresponding day in the next month. For any month in which there is
no such numerically  corresponding day, then as to that month, such day shall be
deemed to be the last  calendar  day of such month.  Any  Interest  Period which
would  otherwise  an on a  non-Business  Day  shall  end on the next  succeeding
Business  Day  unless  that is the first  day of a month,  in which  event  such
Interest Period shall end on the next preceding Business Day. "LIBOR Rate" means
a per annum rate of interest (rounded upward, if necessary, to the nearest 1/100
of 1%) at which dollar  deposits,  in immediately  available funds and in lawful
money of the United Sates would be offered to Bank, outside of the United Sates,
for a term  coinciding  with the Interest  Period  selected by Debtor and for an
amount  equal to the amount of  principal  covered  by  Debtors'  interest  rate
selection,   plus  Bank's  costs,  including  the  costs,  if  any,  of  reserve
requirements.  "Origination  Date" means the first day of the  Interest  Period.
"Reference  Rate"  means  the rate  announced  by Bank  from time to time at its
corporate  headquarters  as its Reference  Rate.  The Reference Rate is an index
rate  determined  by Bank  from  time to time  as a  means  of  pricing  certain
extensions  of credit  and is  neither  directly  tied to any  external  rate of
interest  or index nor  necessarily  the lowest  rate of  interest  or index nor
necessarily the lowest rate of interest charged by Bank at any given time.

EMCON             

By:  /s/  Eugene M. Herson                           

Title:  CFO and President                            

By:  /s/ R. Michael Momboisse                        

Title:  CFO and VP Legal                             

                                       98



                                  EXHIBIT 10.37

                      EXTENSION AND MODIFICATION AGREEMENTS

THIS EXTENSION AND MODIFICATION AGREEMENT  ("Agreement") is made as of March 19,
1999  between  UNION BANK OF  CALIFORNIA,  N.A.,  formerly  known as The Bank of
California, N.A. ("Bank") and EMCON, a California corporation.

RECITALS

This  Agreement  is made and entered  into in  reliance  on the  accuracy of the
following  recitals which are  acknowledged  by Borrower and Bank to be true and
accurate:

A. Borrower is liable to Bank as follows (collectively,  "Liabilities"):  a line
of credit  ("Line of Credit") and a term loan ("Term Loan")  originally  granted
pursuant to the terms of that certain Credit  Agreement dated as of February 29,
1996 (as  amended,  supplemented,  extended,  restated,  or renewed from time to
time, the "Credit  Agreement") by and between Bank and Borrower and evidenced by
that certain (i) Promissory Note Base Rate dated January 27, 1999 in the maximum
principal amount of $10,000,000.00  ("Line of Credit Note");  and (ii) Term Loan
Note dated February 29, 1996 in the original  principal amount of $10,000,000.00
("Term  Note"  together  with  the  Line  of  Credit  Note,  each a  "Note"  and
collectively,  the "Notes").  As of March 17, 1999,  the  outstanding  principal
balance  under  the (1) Line of Credit  Note was  $1,190,893.71,  together  with
accrued and unpaid  interest in the amount of  $9,138.86;  and (2) Term Note was
$3,428,570.00,  together  with  accrued  and  unpaid  interest  in the amount of
$10,497.94;  and (3)  together  with all  accruing  interest,  fees,  costs  and
expenses  provided in the Loan Documents.  The purpose of the Line of Credit was
to support  working  capital needs.  The purpose of the Term Loan was to support
Borrower's  acquisition of Organic Waste Technologies ("OWT") and, in connection
with  this   acquisition,   Borrower   obtained   financing  for  the  operating
requirements of OWT from Charter One Bank ("Charter One"). As of March 17, 1999,
$150,000.000 in the aggregate is unpaid under unexpired letters of credit issued
by Bank for the account of Borrower.

B. To secure Borrower's  obligations to Bank, Borrower executed and delivered to
Bank that certain (i) Security Agreement; and (ii) Pledge Agreement,  each dated
as of  February  29,  1996,  each  executed by Borrower in favor of Bank (each a
"Security Agreement" and collectively,  the "Security  Agreements")  pursuant to
which  Borrower  granted to Bank a security  interest in personal  property  and
fixtures described therein  ("Collateral") which security interest was perfected
by that certain UCC-1  Financing  Statement filed February 29, 1999, as File No.
9606660051,  in the Office of the  Secretary of State of the State of California
("UCC-1").  Pursuant  to the  Security  Agreements  and UCC-1  Bank has a valid,
perfected lien of first priority upon the Collateral.

C. The following documents evidence  Borrower's  obligations to and relationship
with Bank:  the  Agreement,  the Line of Credit Note,  the Term Note, the Credit
Agreement,  the Security Agreements,  the Additional Security Agreement (defined
below), the SLC Agreement (defined below) and the UCC-1. The documents described
above,  together  with any other  documents  executed by or among the parties in
connection with the  Liabilities,  and any and all amendments and  modifications
thereto,  are referred to  collectively  in this Agreement as "Loan  Documents".
There are not written or oral agreements concerning or affecting the Liabilities
between  Borrower  on the one hand and Bank on the  other,  other  than the Loan
Documents. Unless otherwise defined herein, all capitalized terms shall have the
meanings assigned to them in the Loan Documents.



                                       99
<PAGE>


D.  Borrower,  Bank and Charter One have been working to combine  Borrower's and
OWT's existing financing  arrangements into a combined credit  relationship that
would be  agented by Bank  ("Joint  Lending  Project").  Borrower  has  recently
advised Bank and charter One that  Borrower may be sold and has  requested  that
Bank and Charter One defer work on the combined credit relationship. The Line of
Credit Note will mature on March 19,  1999,  on which date all sums of principal
and  accrued  unpaid  interest  will be due and  payable in full.  Borrower  has
advised Bank that because of the potential  sale of Borrower,  Borrower will not
satisfy it obligations to Bank on the Termination Date ("Potential Default"). In
addition,  Borrower has advised Bank that financing requirements for its working
capital  requirements equal  approximately  $5,000,000.00 for the remaining term
(as extended by this Agreement) of the Line of Credit Note. Borrower has further
requested that Bank extend the Termination Date and provide additional credit in
the form of a cash secured standby letter of credit.  Borrower is also agreeable
to a reduction in the maximum amount available under the Line of Credit Note and
to the cancellation of OWT's line of credit from Charter One.

E. At Borrower's  request,  Bank is willing to modify the Loan  Documents as set
forth herein, provided that the conditions set forth herein are satisfied within
the time periods  required under this Agreement,  and provided  further that all
security  interests and liens under the Loan  Documents  shall continue to exist
and remain in full force and effect.  Bank is entering  into this  Agreement for
the sole purpose of allowing Borrower an additional opportunity to negotiate the
possible sale of Borrower.

AGREEMENT

NOW  THEREFORE,  in  consideration  of the  foregoing  and  for  other  valuable
consideration,  the receipt and  sufficiency  of which are hereby  acknowledged,
Bank and Borrower hereby agree as follows:

1. Incorporation of Recitals.  Each of the above recitals is incorporated herein
and deemed to be the  agreement  of the Bank and  Borrower and is relied upon by
each party to this Agreement in agreeing to the terms of this Agreement.

2. Confirmation  of  Collateral.  Borrower  hereby grants  and confirms that all
obligations  of  Borrower  to Bank are secured by a  perfected,  first  priority
security interest in Collateral.

3. Conditions  Precedent.  Borrower understands that this Agreement shall not be
effective  and Bank  shall  have no  obligation  to amend  the terms of the Loan
Documents as provided  herein unless and until each of the following  conditions
precedent  has been  satisfied  not later than March 19, 1999, or waived by Bank
(in Bank's sole discretion):

         (a) Borrower  shall have executed and delivered to Bank this  Agreement
         together with (i) a promissory note, in form and substance satisfactory
         to Bank in the  maximum  principal  amount of FIVE  MILLION  AND NO/100
         DOLLARS  ($5,000,000.00),  dated  as of  the  date  of  this  Agreement
         ("Replacement  Line of Credit Note"),  which Replacement Line of Credit
         Note  shall  supersede  and  replace  the  Line of  Credit  Note in its
         entirety,  and which Replacement Line of Credit Note shall evidence all
         amounts outstanding under the Line of Credit Note, and such outstanding
         amounts  to be repaid as  provided  in the  Replacement  Line of Credit
         Note; and (ii) a security agreement, in form and substance satisfactory
         to Bank  ("Additional  Security  Agreement"),  granting Bank a security
         interest in that certain  certificate of deposit no.  7009033775 in the
         principal  amount  of  $136,500.00,  issued  and held by Bank,  and all
         renewals  of  and  substitutions  for  such  certificate   ("Additional
         Collateral").


                                      100
<PAGE>


         (b) Borrower shall have  reimbursed  Bank for Bank's costs and expenses
         through  the date of this  Agreement,  including,  without  limitation,
         reasonable  attorney's fees and expenses  (including the fees of Bank's
         inside  counsel),  incurred in  connection  with both the Joint Lending
         Project and the  negotiation  and  drafting of this  Agreement  and the
         transactions contemplated hereby in the amount of $6,610.00.

         (c) On or before  such time as Bank may  require,  Borrower  shall have
         taken any and all actions and  executed  and  delivered to Bank any and
         all documents  necessary or  appropriate  in Bank's sole  discretion to
         effectuate this Agreement.

         (d) Borrower shall have paid to Bank a non-refundable documentation fee
         in the amount of $10,000.00

4.  Documentation  Fee. In  consideration  of the  extension  and  modifications
granted by Bank to Borrower  pursuant to this Agreement,  Borrower agrees to pay
to Bank a  non-refundable  fee of $10,000.00 which amount shall be paid as maybe
provided in Section 3 above.

5. Waiver of Potential  Default.  Subject to all of the terms and  conditions of
this Agreement,  including,  without  limitation,  the requirements of Section 3
hereof,  Bank hereby agrees to waive its default  rights in connection  with the
Potential Default,  provided,  however,  that this waiver is not a waiver of any
subsequent  breach of the same provision of the Credit  Agreement or any Note or
other Loan Documents,  nor is it a waiver of any current or future breach of any
other  provision of the Credit  Agreement  or any Note or other Loan  Documents.
Bank is not obligated to provide this or any other waiver of its default rights.
Further,  the Bank reserves all of the rights,  powers and remedies available to
it under the Credit  Agreement,  each Note and any other Loan  Documents  if any
subsequent  breach of the same  provisions or any other  provision of the Credit
Agreement, any Note or any other Loan Document should occur.

6. Modification of Loan Documents.  To induce Bank to enter into this Agreement,
Borrower agrees that the Loan Documents are hereby  supplemented and modified as
follows,  which  modifications  shall supersede and prevail over any conflicting
provisions of the Loan Documents:

         (a)  The date "March 19, 1999" in the paragraph  entitled  "Termination
Date" in Article  One of the Credit  Agreement  is hereby  amended to "April 30,
1999".

         (b)  Section  2.1.1 of the Credit  Agreement  is hereby  deleted in its
entirety and replaced with the following:

                  "2.1.1 Line of Credit.  Subject to the terms and conditions of
                  this Agreement  from time to time prior to  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 that, in the aggregate,  shall not exceed at
                  any time FIVE MILLION AND NO/100 DOLLARS  ($5,000,000.00) (the
                  "Credit Limit"), in the following manner."

         (c) Section  2.1.1(a) of the Credit  Agreement is hereby deleted in its
entirety and replaced with the following:

                  "(a)  Advances.  Provide up to 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


                                      101
<PAGE>

                  Advance Sublimit, as Borrower may elect, in minimum amounts of
                  $10,000.000 or integral multiples  thereof.  Advances shall be
                  used by Borrower  for the  purpose of working  capital for its
                  own operations".

         (d) A new Section  2.1.3 is hereby  added to the Credit  Agreement  and
shall read as follows:

                  "2.1.3 Standby Letter of  Credit/Cash  Secured.  Provide up to
                  $136,500.00  in aggregate  outstanding  unpaid face amount for
                  the  purpose  of  issuing an  irrevocable,  standby  letter of
                  credit,  in form and substance  satisfactory  to Bank, for the
                  account of Borrower in United States Dollars ("SLC").  The SLC
                  shall expire on September 30, 1999.  Borrower  shall  execute,
                  deliver and perform in  accordance  with Bank's  standard form
                  Standby Letter of Credit Application & Agreement, all terms of
                  which  are   incorporated   herein  by  this  reference  ("SLC
                  Agreement").   To  secure   Borrower's   obligations  to  Bank
                  evidenced by the SLC Agreement,  Borrower  execute and deliver
                  to Bank that certain security  agreement dated as of March 19,
                  1999  (Additional  Security  Agreement")"  providing to Bank a
                  first priority security  interest in that certain  certificate
                  of  deposit  no.   7009033775  in  the  principal   amount  of
                  $136,500.00,  issued and held by Bank,  and all renewals of an
                  substitutions for such certificate".

7. Representations and Warranties.  To induce Bank to enter into this Agreement,
Borrower hereby represents and warrants to Bank as follows:

         (a) All representations and warranties  contained in this Agreement and
         in any and all of the other Loan  Documents  are true and correct as of
         the date of this Agreement, and all such representations and warranties
         shall survive the execution of this Agreement.

         (b)  The  execution,  delivery  and  performance  by  Borrower  of this
         Agreement   and  all  documents   contemplated   hereunder  are  within
         Borrower's powers,  have been duly authorized,  and are not in conflict
         with Borrower's  articles of incorporation or by-laws,  or the terms of
         any charter or other organizational  document of Borrower; and all such
         documents   constitute  valid  and  binding  obligations  of  Borrower,
         enforceable  in  accordance  with  their  terms.   In  addition,   such
         execution,  delivery and  performance  by Borrower will not violate any
         law, rule or order of any court or governmental agency or body to which
         Borrower  is  subject;  and cannot  (except as  expressly  provided  or
         contemplated  herein) result in the creation or imposition of any lien,
         security interest or encumbrance on any now owned or hereafter acquired
         property of Borrower.

         (c) With the exception of the Potential Default,  no event has occurred
         or failed to occur  that is, or,  with  notice or lapse of time or both
         would constitute a default, an event of default, or a breach or failure
         of any condition under any Loan Document.

         (d)  Each  Note  represents  an  unconditional,   absolute,  valid  and
         enforceable  obligation  against  Borrower.  Borrower  has no claims or
         defenses  against  Bank or any other  person or entity  which  would or
         might  affect;  (a) the  enforceability  of any  provisions of the Loan
         Documents;  or (b)  the  collectability  of  sums  advanced  by Bank in
         connection with the Liabilities.  Borrower understands and acknowledges
         that the Bank is entering into this  Agreement in reliance upon, and in
         partial consideration for, this acknowledgment and representation,  and
         agrees that such reliance is reasonable and appropriate.


                                      102
<PAGE>

8. Borrower's  Covenants.  Unless Bank otherwise  consents in writing during the
extension period provided herein, Borrower will do the following:

         (a) Comply with all  requirements  of all Loan  Documents to the extent
not inconsistent with this Agreement.

         (b) On or before April 5, 1999,  provide Bank with written  evidence of
         the cancellation of OWT's credit facility with Charter One.

         (c) Not enter into any agreements  with any of its other creditors that
         might impair it ability to perform under this Agreement.

         (d)  Ensure  that Bank is fully  informed  at all times of all  matters
         relating to the  operation of  Borrower's  business,  including any new
         reformed or revived subsidiaries or affiliates,  any planned changes in
         key personnel or manner of operating its business.

         (e)  Ensure  that Bank is fully  informed  at all times of all  matters
         relating to the possible sale of Borrower.

         (f) Take any and all actions of any kind or nature  whatsoever,  either
         directly  or  indirectly,  that are  necessary  to  prevent  Bank  from
         suffering a loss with respect to the  Liabilities  or being deprived of
         the  Collateral  or the  Additional  Collateral,  or of any  rights  or
         remedies of Bank with respect to the Liabilities, the Loan Documents or
         this  Agreement  in the  event of a  default  by  Borrower  under  this
         Agreement or any other Loan  Documents (or the ability to exercise such
         any rights or remedies).

         (g)  Reimburse  Bank for  Bank's  costs  and  expenses  as set forth in
         Section  3(b) of this  Agreement  for such costs and expenses for which
         Bank  did  not  have  invoices  or  statements  as of the  date of this
         Agreement.

9. Additional Events of Default.  In addition to the events of default set forth
in the Loan Documents,  the occurrence of any of the following events of default
other than the  Potential  Default  shall be an event of default  and, at Bank's
option,  may make all obligations of Borrower  immediately due and payable,  all
without demand, presentment or notice, all of which requirements Borrower hereby
waives:

         (a)  Failure  to  perform  any of the  obligations  set  forth  in this
         Agreement or in any other Loan  documents  (as the same may be modified
         by this Agreement).

         (b) Any  representation  or warranty of Borrower herein or in any other
         Loan Document shall be false, misleading or incorrect.

         (c)  If  there  is  any  substantial  impairment  of  the  prospect  of
         Borrower's  satisfaction  of its  obligations  to Bank  or  substantial
         impairment of the value of the Collateral or the Additional Collateral,
         or any  substantial  impairment  of the  priority  of  Bank's  security
         interest in or lien on any Collateral or Additional Collateral.

10.  Remedies.  Upon the  occurrence  of an Event of  Default  and at all  times
thereafter,  Bank,  without the necessity of obtaining any prior approval of any
court, shall be entitled to terminate all advances or other extensions of credit
under the Loan  Documents and Bank shall also be entitled to exercise all rights
and  remedies  available  to Bank as a creditor  generally,  including,  without
limitation, all remedies


                                      103
<PAGE>


available  to Bank  under the Loan  Documents,  as well as rights  and  remedies
available  to Bank at law or in equity.  All such rights and  remedies  shall be
cumulative.  No  failure or delay on the part of Bank in  exercising  any power,
right or  remedy  under  any of the Loan  Documents  shall  operate  as a waiver
thereof,  and no single or partial  exercise of any such power,  right or remedy
shall preclude any further  exercise thereof or the exercise of any other power,
right or remedy.

11. Dispute  Resolution.  This Agreement  hereby  incorporates  any  alternative
dispute  resolution  agreement  previously,  concurrently or hereafter  executed
between Borrower and Bank.

12. Waiver of Statute of  Limitations.  Borrower shall not please the statute of
limitations to any action brought by Bank with respect to the  Liabilities,  the
Notes,  Credit Agreement,  any other Loan Document,  the Collateral,  and hereby
waives  the  statute of  limitations  in respect of any and all sums due from it
under the Notes.

13.      Miscellaneous

         (a) All the parties hereto agree to and will cooperate  fully with each
         other in the  performance  of this  Agreement  and the  Loan  Documents
         including,  without limitation,  executing any additional documents and
         instruments  reasonable  or necessary to the full  performance  of this
         Agreement.  Without limiting the generality of the foregoing,  Borrower
         agrees to execute such other and further  documents and  instruments as
         Bank may request to implement the  provisions of this  Agreement and to
         perfect and protect the liens and  security  interests  created by this
         Agreement or any other Loan Document.

         (b) This  Agreement  shall be binding  upon and inure to the benefit of
         and be enforceable by the parties hereto,  their respective  successors
         and  assigns.  No other person or entity shall be entitled to claim any
         right or benefit hereunder,  including,  without limitation, the status
         of a third party beneficiary hereunder, except the Released Parties.

         (c) Bank and Borrower agree that except as expressly  provided  herein,
         the Loan Documents  shall remain in full force and effect in accordance
         with their respective  terms, and this Agreement shall not be construed
         to:

                  (i) Impair the validity, perfection or priority of any lien or
                  security interest securing Borrower's obligations to Bank;

                  (ii) Waive or impair any  rights,  powers or  remedies of Bank
                  under the Loan Documents;

                  (iii) Constitute an agreement by Bank or require Bank to grant
                  forbearance   periods   or  extend  the  term  of  the  Credit
                  Agreement, the Line of Credit Note, or the time for payment of
                  any of  Borrower's  obligations  to Bank  except as  expressly
                  provided  herein,  none of which Bank  agrees or has agreed to
                  do, and all of which  matters are in Bank's sole and  absolute
                  discretion; or

                  (iv) make any other loans or other  extension  of credit to or
                  for the benefit of Borrower.

         In the event of any  inconsistency  between the terms of this Agreement
         and any other Loan  Document,  this  Agreement  shall govern.  Borrower
         acknowledges  that it has  consulted  with  counsel and with such other
         experts and advisors as it has deemed necessary in connection with


                                      104
<PAGE>


         the negotiation,  execution and delivery of this Agreement,  or has had
         an  opportunity  to so consult and has  knowingly  chosen not to do so.
         This Agreement shall be construed  without regard to any presumption or
         rule  requiring  that it be  construed  against the party  causing this
         Agreement or any part hereof to be drafted.  The headings  used in this
         Agreement  are  for  convenience  only  and  shall  be  disregarded  in
         interpreting the substantive provisions of this Agreement.

         (d) This Agreement and the other Loan Documents  shall not be deemed or
         construed to create a  partnership,  tenancy in common,  joint tenancy,
         joint  venture,  co-ownership  or any other  relationship  aside from a
         continuing  debtor-creditor  relationship  between  Borrower on the one
         hand and Bank on the other.

         (e) In case any provision in this Agreement  shall be invalid,  illegal
         or unenforceable,  such provision shall be severable from the remainder
         of this agreement and the validity,  legality and enforceability of the
         remaining  provisions  shall  not in any way be  affected  or  impaired
         thereby.

         (f) If Bank receives any payment or rents, issues,  profits or proceeds
         of any Collateral  which are subsequently  invalidated,  declared to be
         fraudulent  or  preferential,  set  aside or  required  to be paid to a
         trustee,  debtor-in-possession,  receiver  or any other party under any
         bankruptcy law, common law, equitable cause or otherwise, then, to such
         extent,  the  obligations  or part thereof  intended to be satisfied by
         such  payments or proceeds  shall be reserved  and  continue as if such
         payments or proceeds had not been received by Bank.

         (g) This Agreement may not be amended, waived or modified in any manner
         without  the  prior  written  consent  of the  party  against  whom the
         amendment, waiver or modification is sought to be enforced.

         (h)  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 an  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 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) discover;
         (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 Sates 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.  All of such costs
         and expenses  shall bear  interest  from the time of demand at the rate
         then in effect under the Line of Credit Note.

         (i) Except as otherwise  provided herein,  this Agreement and all other
         Loan  Documents and the rights and  obligations  of the parties  hereto
         shall be governed by the laws of the State of California without regard
         to principles concerning choice of law. In any action arising out of or
         connected with this Agreement,  Borrower hereby  expressly  consents to
         the personal  jurisdiction of any state or federal court located in the
         State of  California  and also  consents  to  service of process by any
         means authorized by federal or governing state law.


                                      105
<PAGE>


         (j) This Agreement may be executed in any number of counterparts which,
         when taken together, shall constitute but one agreement.

         (k) All representations, warranties, covenants, agreements, waivers and
         releases of Borrower contained herein shall survive the payment in full
         of Borrower's obligations to Bank.

         (l)  Any  notices  or  other  communications  provided  for or  allowed
         hereunder  shall be effective  only when given by one of the  following
         methods and addressed to the respective party at its address given with
         the  signatures at the end of this Agreement and shall be considered to
         have been validly given:  (a) upon delivery,  if delivered  personally;
         (b) upon  receipt,  if mailed,  first class postage  prepaid,  with the
         United States Postal Service;  (c) on the next business day, if sent by
         overnight  courier  service  of  recognized  standing;   and  (d)  upon
         telephoned  confirmation  of receipt,  if telecopied.  The addresses to
         which  notices or demands  are to be given may be changed  from time to
         time by notice delivered as provided above.

         (m) In the  event  of any  inconsistency  between  the  terms  of  this
         Agreement and any other  billings,  statements or the like form Bank to
         Borrower  in  connection  with  the  Liabilities,  the  terms  of  this
         Agreement  shall  prevail  over the terms of any other  such  billings,
         statements or the like.

         (n) This Agreement and other Loan Documents are intended by the parties
         as the final  expression of their  agreement and therefore  incorporate
         all  negotiations of the parties hereto and are the entire agreement of
         the  parties  hereto.  Borrower  acknowledges  that it is relying on no
         written or oral agreement,  representation,  warranty, or understanding
         of any kind made by Bank or any  employee  or agent of Bank  except for
         the agreements of Bank set forth herein or in the other Loan Documents.
         Except  as  expressly  set  forth in this  Agreement,  the  other  Loan
         Documents  remain  unchanged  and in full force and  effect.  Where any
         provisions of the Credit Agreement  amended by this Agreement appear in
         a promissory note tied to the Credit Agreement,  the same provisions in
         said promissory note shall be deemed likewise amended.

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

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

By:  \s\ Eugene M. Herson                   By:  
- - -----------------------------               ------------------------------
Title:  CEO and President                   Title:  

By:  \s\ R. Michael Momboisse
- - -----------------------------
Title:  CFO and VP Legal



                                      106



                                  EXHIBIT 23.1

                        REPLACEMENT LINE OF CREDIT NOTE

================================================================================
Borrower Name
EMCON
================================================================================
Borrower Address                          Office              Loan Number
  400 South El Camino Real, Suite 1200    70061
  San Mateo, California  94402-1708
                                          --------------------------------------
                                          Maturity Date       Amount
                                          April 30, 1999      $5,000,000.00
================================================================================

$5,000,000.00                                     Effective as of March 19, 1999

FOR VALUE  RECEIVED,  on April  30,  1999  ("Maturity  Date"),  the  undersigned
("Borrower")  promises  to pay to the order of UNION  BANK OF  CALIFORNIA,  N.A.
("Bank"),  as  indicated  below,  the  principal  sum of FIVE MILLION AND NO/100
DOLLARS  ($5,000,000.00),  or so much  thereof as is  disbursed,  together  with
interest on the balance of such principal from time to time outstanding,  at the
per annum rate or rates and at the times set forth  below.  At any time prior to
the maturity of this Note,  subject to the provisions of paragraph 4, below,  of
this Note,  Borrower may borrow,  repay and reborrow hereon so long as the total
outstanding  at any one time does not exceed the principal  amount of this Note.
All  computations  of  interest  under this Note shall be made on the basis of a
year of 360 days, for actual days elapsed.

1. INTEREST PAYMENTS.  Borrower shall pay interest on the 19TH day of each month
commencing the first such date to occur after the first advance under this Note.
Should  interest not be paid when due, it shall become part of the principal and
bear  interest as herein  provided.  On the Maturity  Date,  all  principal  and
interest then unpaid shall be due and payable.

         (a) BASE  INTEREST  RATE. At Borrower's  options,  amounts  outstanding
         hereunder in increments of at least  $100,000.00 shall bear interest at
         a rate,  based on an index  selected by  Borrower,  which is 1-3/4% per
         annum in excess of Bank's LIBOR Rate for the Interest  Period  selected
         by Borrower, in each case acceptable to Bank.

         No Base  Interest  Rate may be changed,  altered or otherwise  modified
         until the expiration of the Interest Period  selected by Borrower.  The
         exercise of interest  rate options by Borrower  shall be as recorded in
         Bank's  records,  which records  shall be prima facile  evidence of the
         amount  borrowed  under either  interest  option and the interest rate;
         provided,  however,  that failure of Bank to make any such  notation in
         its records shall not discharge  Borrower from its obligations to repay
         in full with  interest  all  amounts  borrowed.  In no event  shall any
         Interest Period extend beyond the maturity date of this Note.

         To exercise  this option,  Borrower may, from time to time with respect
         to principal outstanding on which a Base Interest Rate is not accruing,
         and on the expiration of any Interest  period with respect to principal
         outstanding on which a Base Interest Rate has been accruing,  select an
         index  offered by Bank for a Base  Interest  Rate Loan and an  Interest
         Period by telephoning an authorized  lending officer of Bank located at
         the banking office identified below prior to 10:00 a.m.,  Pacific time,
         on any Business Day and  advising  that officer of the selected  Index,
         the  Interest   Period  and  the   Origination   Date  selected  (which
         Origination  Date,  for a Base  Interest  Rate Loan  based on the LIBOR
         Rate,  shall follow the date of such  selection by no more than two (2)
         Business Days).


                                      107
<PAGE>


         Bank will mail a written  confirmation of the terms of the selection to
         Borrower  promptly  after the  election  is made.  Failure to send such
         confirmation  shall not affect Bank's rights to collect interest at the
         rate selected. If, on the date of the selection,  the index selected is
         unavailable for any reason,  the selection shall be void. Bank reserves
         the   right  to  fund  the   principal   from  any   source   of  funds
         notwithstanding any Base Interest Rate selected by Borrower.

         (b) VARIABLE INTEREST RATE. All principal  outstanding  hereunder which
         is not bearing  interest at a Base Interest Rate shall bear interest at
         a rate per annum equal to the Reference Rate,  which rate shall vary as
         and when the Reference Rate changes.

         Borrower  shall pay all amounts due under this Note in lawful  money of
         the United  States at Bank's  Northern  California  Commercial  Banking
         Office, or such other office as may be designated by Bank, from time to
         time.

         2. LATE  PAYMENTS.  If any  payment  required by the terms of this Note
         shall remain  unpaid ten days after same is due, at the option of Bank,
         Borrower shall pay a fee of $100 to Bank.

         3. INTEREST RATE  FOLLOWING  DEFAULT.  In the event of default,  at the
         option of Bank, and, to the extent permitted by law,  interest shall be
         payable  on the  outstanding  principal  under this Note at a per annum
         rate  equal to five  percent  (5%) in  excess  of the  Reference  Rate,
         calculated  from the date of default  until all amounts  payable  under
         this Note are paid in full.

         4.       PREPAYMENT.

                  (a) Amounts  outstanding under this Note bearing interest at a
                  rate based on the Reference Rate may be prepaid in whole or in
                  part at any time,  without  penalty or premium.  Borrower  may
                  prepay amounts outstanding under this Note bearing interest at
                  a Base Interest Rate in whole or in part provided Borrower has
                  given Bank not less than five (5) Business  Days prior written
                  notice of  Borrower's  intention to make such  prepayment  and
                  pays  to  Bank  the  liquidated   damages  due  as  a  result.
                  Liquidated  Damages shall also be paid, if Bank, for any other
                  reason, including acceleration or foreclosure, receives all or
                  any portion of principal  bearing  interest at a Base Interest
                  Rate prior to its scheduled payment date.  Liquidated  Damages
                  shall be an amount  equal to the present  value of the product
                  of: (i) the  difference  (but not less than zero)  between (a)
                  the Base  Interest Rate  applicable  to the  principal  amount
                  which is being  prepaid,  and (b) the return  which Bank could
                  obtain if it used the amount of such  prepayment  of principal
                  to purchase at bid price regularly quoted securities issued by
                  the  United   States  having  a  maturity  date  most  closely
                  coinciding  with the relevant Base Rate Maturity Date and such
                  securities  were  held by Bank  until the  relevant  Base Rate
                  Maturity Date ("Yield Rate");  (ii) a fraction,  the numerator
                  of which is the number of days in the period  between the date
                  of prepayment and the relevant Base Rate Maturity Date and the
                  denominator  of which is 360;  and  (iii)  the  amount  of the
                  principal  so  prepaid  (except  in the event  that  principal
                  payments are  required  and have been made as scheduled  under
                  the terms of the Base Interest Rate Loan being  prepaid,  then
                  an amount equal to the lesser of (A) the amount prepaid or (B)
                  50% of the sum of (1) the amount prepaid and (2) the amount of
                  principal  scheduled under the terms of the Base Interest Rate
                  Loan being prepaid to be outstanding at the relevant Base Rate
                  Maturity Date). Present value under this Note is determined by
                  discounting the above product to present value using the Yield
                  Rate as the annual discount factor.


                                      108
<PAGE>


                  (b) In no event shall Bank be obligated to make any payment or
                  refund to  Borrower,  nor shall  Borrower  be  entitled to any
                  setoff or other claim  against  Bank,  should the return which
                  Bank could obtain  under this  prepayment  formula  exceed the
                  interest that Bank would have received if not  prepayment  had
                  occurred.  All  prepayments  shall include  payment of accrued
                  interest  on the  principal  amount  so  prepaid  and shall be
                  applied  to  payment  of  interest   before   application   to
                  principal.  A  determination  by Bank as to the prepayment fee
                  amount, if any, shall be conclusive.

                  (c) Bank  shall  provide  Borrower a  statement  of the amount
                  payable on account of prepayment.  Borrower  acknowledges that
                  (1)  Bank   establishes   a  Base   Interest   Rate  upon  the
                  understanding that it apply to the Base Interest Rate Loan for
                  the entire Interest Period, and (ii) any prepayment may result
                  in Bank incurring  additional costs,  expenses or liabilities;
                  and  Borrower  agrees to pay  these  liquidated  damages  as a
                  reasonable estimate of the costs,  expenses and liabilities of
                  Bank associated with such prepayment.

         5. DEFAULT AND ACCELERATION OF TIME FOR PAYMENT. Default shall include,
         but  not be  limited  to,  any of the  following:  (a) the  failure  of
         Borrower to make any payment required under this Note when due; (b) any
         breach,  misrepresentation or other default by Borrower, any guarantor,
         co-maker,  endorser,  or any  person  or  entity  other  than  Borrower
         providing   security  for  this  Note  (hereinafter   individually  and
         collectively referred to as the "Obligor") under any security, guaranty
         or other agreement between Bank and any Obligor;  (c) the insolvency of
         any  Obligor  or the  failure  of any  Obligor  generally  to pay  such
         Obligor's  debts as such debts become due; (d) the  commencement  as to
         any Obligor of any voluntary or involuntary  proceeding  under any laws
         relating to bankruptcy, insolvency,  reorganization,  arrangement, debt
         adjustment or debtor relief;  (e) the assignment by any Obligor for the
         benefit  of  such  Obligor's   creditors;   (f)  the  appointment,   or
         commencement  of any  proceeding  for the  appointment  of a  receiver,
         trustee,  custodian or similar official for all or substantially all of
         any Obligor's property;  (g) the commencement of any proceeding for the
         dissolution  or  liquidation  of any Obligor;  (h) the  termination  of
         existence or death of any Obligor;  (i) the  revocation of any guaranty
         or subordination  agreement given in connection with this Note; (j) the
         failure of any Obligor to comply with any order, judgment,  injunction,
         decree, writ or demand of any court or other public authority;  (k) the
         filing  or  recording  against  any  Obligor,  or the  property  of any
         Obligor,  of any notice of levy,  notice to  withhold,  or other  legal
         process for taxes  other than  property  taxes;  (l) the default by any
         Obligor  personally liable for amounts owed hereunder on any obligation
         concerning  the  borrowing  of  money;  (m) the  issuance  against  any
         Obligor,  or the  property of any Obligor,  of any writ of  attachment,
         execution,  or other  judicial  lien; or (n) the  deterioration  of the
         financial  condition  of any  Obligor  which  results  in Bank  deeming
         itself,  in good  faith,  insecure.  Upon  the  occurrence  of any such
         default, Bank, in its discretion,  may cease to advance funds hereunder
         and may declare all  obligations  under this Note  immediately  due and
         payable;  however,  upon the occurrence of an event of default under d,
         e, f, or g, all  principal  and  interest  shall  automatically  become
         immediately due and payable.

         6. ADDITIONAL  AGREEMENTS OF BORROWER.  If any amounts owing under this
         note are not paid  when  due,  borrower  promises  to pay all costs and
         expenses, including reasonable attorneys' fees, incurred by bank in the
         collection or  enforcement  of this note.  Borrower and any endorser of
         this Note, for the maximum period of time and the full extent permitted
         by law, (a) waive diligence, presentment, demand, notice of nonpayment,
         protest,  notice of protest,  and notice of every  kind;  (b) waive the
         right to assert the defense of any statute of  limitations  to any debt
         or obligation hereunder;  and (c) consent to renewals and extensions of
         time for the payment of any amount due under this Note. If this Note is
         signed by more than one party, the term "Borrower"


                                      109
<PAGE>


         includes  each  of the  undersigned  and  any  successors  in  interest
         thereof; all of whose liability shall be joint and several. Any married
         person who signs this Note agrees that  recourse may be had against the
         separate  property of that person for any  obligations  hereunder.  The
         receipt of any check or other item of payment by Bank,  at its  option,
         shall not be  considered a payment on account until such check or other
         item of payment is honored  when  presented  for  payment at the drawee
         bank.  Bank may delay the  credit of such  payment  based  upon  Bank's
         schedule  of funds  availability,  and  interest  under this Note shall
         accrue  until the funds are deemed  collected.  In any  action  brought
         under or arising out of this Note, Borrower and any Obligor,  including
         their successors and assigns, hereby consent to the jurisdiction of any
         competent  court  within the State of  California,  as  provided in any
         alternative dispute resolution  agreement executed between Borrower and
         Bank, and consent to service of process by any means authorized by said
         state's law. The term "Bank" includes,  without limitation,  any holder
         of this  Note.  This Note shall be  construed  in  accordance  with and
         governed  by the laws of the  State of  California.  This  Note  hereby
         incorporates any alternative dispute resolution  agreement  previously,
         concurrently or hereafter executed between Borrower and Bank.

         7.  DEFINITIONS.  As used herein,  the  following  terms shall have the
         meanings  respectively  set forth below.  "Base  Interest Rate" means a
         rate of interest  based on the LIBOR Rate.  "Base  Interest  Rate Loan"
         means amounts  outstanding under this Note that bear interest at a Base
         Interest  Rate.  "Base Rate  Maturity  Date"  means the last day of the
         Interest  Period with  respect to  principal  outstanding  under a Base
         Interest  Rate Loan.  "Business  Day" means a day on which Bank is open
         for business for the funding of corporate  loans,  and, with respect to
         the rate of interest based on the LIBOR Rate, on which dealings in U.S.
         dollar deposits outside of the United States may be carried on by Bank.
         "Interest  Period"  means with respect to funds  bearing  interest at a
         rate based on the LIBOR Rate, any calendar period of one, two, or three
         months.  In determining an Interest Period, a month means a period that
         starts on one  Business Day in a month and ends on and includes the day
         preceding the numerically  corresponding day in the next month. For any
         month in which there is no such numerically  corresponding day, then as
         to that  month,  such day shall be deemed to the last  calendar  day of
         such  month.  Any  Interest  Period  which  would  otherwise  end  on a
         non-Business  Day shall end on the next succeeding  Business Day unless
         that is the first day of a month,  in which event such Interest  Period
         shall end on the next preceding  Business Day. "LIBOR Rate" means a per
         annum rate of Interest  (rounded upward,  if necessary,  to the nearest
         1/100 of 1%) at which dollar deposits,  in immediately  available funds
         and in lawful  money of the  United  States  would be  offered to Bank,
         outside of the United States,  for a term  coinciding with the Interest
         Period  selected by Borrower  and for an amount  equal to the amount of
         principal  covered by Borrower's  interest rate selection,  plus Bank's
         costs,   including   the  cost,   if  any,  of  reserve   requirements.
         "Origination  Date"  means  the  first  day  of  the  Interest  Period.
         "Reference  Rate" means the rate announced by Bank from time to time at
         its corporate  headquarters as its "Reference Rate." The Reference Rate
         is an index  rate  determined  by Bank  from time to time as a means of
         pricing  certain  extensions of credit and is neither  directly tied to
         any external rate of interest or index nor  necessarily the lowest rate
         of interest charged by Bank at any given time.

         This  Note is the  Replacement  Line of  Credit  Note  defined  in that
         certain Extension and Modification Agreement dated as of March 19, 1999
         between  Bank  and  Borrower  (as  amended,   supplemented,   extended,
         restated, or renewed from time to time,  "Agreement"),  and is governed
         by the terms thereof,  and supersedes and replaces that certain Line of
         Credit  Note dated  January  27,  1999,  as amended  from time to time,
         executed by Borrower in favor of Bank (the "Previous  Note"). As of the
         effective date of the  Agreement,  all unpaid  principal,  interest and
         other amounts accrued and outstanding under the Previous Note shall for
         all purposes be and constitute unpaid


                                      110
<PAGE>


         amounts outstanding under, and evidenced by this Note. Each capitalized
         term not  otherwise  defined in this Note shall  have the  meaning  set
         forth in the Agreement.

         EMCON, a California corporation

         By:  \s\  Eugene M. Herson                  
         -------------------------------
         Title:  President and CEO                   

         By:  \s\ R. Michael Momboisse               
         -------------------------------
         Title:  CFO and VP Legal                    



                                      111




                                  EXHIBIT 23.1


                          CONSENT OF ERNST & YOUNG LLP
                              INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statement (Form
S-8  No.333-61151)  pertaining  to the 1998  Stock  Option  Plan of EMCON of our
report  dated  February 23, 1999,  with  respect to the  consolidated  financial
statements  and schedules of EMCON included in its Annual Report (Form 10-K) for
the year ended December 31, 1998.



San Francisco, California
March 24, 1999





                                      112

<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
     This schedule  contains summary  financial  information  extracted from the
consolidated balance sheets, consolidated statements of income, and consolidated
statements of cash flows included inthe Company's Form 10-K for the twelve month
period ended December 31, 1998, and is qualified in its entirety by reference to
such financial statements and the notes thereto.
</LEGEND>
<CURRENCY>                      U.S. DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                              JAN-1-1999
<PERIOD-START>                                 JAN-3-1998
<PERIOD-END>                                   JAN-1-1999
<EXCHANGE-RATE>                                1
<CASH>                                         2,677,000
<SECURITIES>                                   0
<RECEIVABLES>                                  40,885,000
<ALLOWANCES>                                   1,538,000
<INVENTORY>                                    2,630,000
<CURRENT-ASSETS>                               53,475,000
<PP&E>                                         34,890,000
<DEPRECIATION>                                 18,371,000
<TOTAL-ASSETS>                                 95,889,000
<CURRENT-LIABILITIES>                          25,168,000
<BONDS>                                        0
                          0
                                    0
<COMMON>                                       41,628,000
<OTHER-SE>                                     0
<TOTAL-LIABILITY-AND-EQUITY>                   95,889,000
<SALES>                                        129,960,000
<TOTAL-REVENUES>                               129,960,000
<CGS>                                          76,749,000
<TOTAL-COSTS>                                  76,749,000
<OTHER-EXPENSES>                               48,081,000
<LOSS-PROVISION>                               755,000
<INTEREST-EXPENSE>                             1,234,000
<INCOME-PRETAX>                                3,141,000
<INCOME-TAX>                                   1,508,000
<INCOME-CONTINUING>                            1,633,000
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   1,633,000
<EPS-PRIMARY>                                  0.19
<EPS-DILUTED>                                  0.19
        




</TABLE>


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