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


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



                                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


                                     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


                                    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


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



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



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


                                   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



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


                                     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:



- - -------------------------------------------------------------------------------------------------------------------------------
                                                                                                  High               Low
- - -------------------------------------------------------------------------------------------------------------------------------
                                                                                                               
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
- - -------------------------------------------------------------------------------------------------------------------------------


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



Item 6.       Selected Financial Data

Five Year Financial Highlights



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

                                                ------------------------------------------------------------------
(In thousands, except per share amounts)            1998          1997         1996         1995         1994
- - ------------------------------------------------------------------------------------------------------------------
                                                                                          
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
- - ------------------------------------------------------------------------------------------------------------------


(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



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.




- - --------------------------------------------------------------------------------------------------------------------------
                                                          Percentage of                               Percentage
                                                           Net Revenue                            Increase (Decrease)
                                              ------------------------------------        --------------------------------
                                                                                                 1998             1997
                                                                                                  vs.              vs.
Years Ended December 31,                          1998         1997         1996                 1997             1996
- - --------------------------------------------------------------------------------------------------------------------------
                                                                                                     
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%
- - --------------------------------------------------------------------------------------------------------------------------


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



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



$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



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



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



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



EMCON
CONSOLIDATED STATEMENTS OF OPERATIONS


- - ------------------------------------------------------------------------------------------------------------------------
                                                                                   Years Ended December 31,
                                                                        ------------------------------------------------
(In thousands, except per share amounts)                                     1998            1997             1996
- - ------------------------------------------------------------------------------------------------------------------------
                                                                                                        

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.




                                       19





EMCON
CONSOLIDATED BALANCE SHEETS
- - ------------------------------------------------------------------------------------------------------------------------
                                                                                                    December 31,
                                                                                              --------------------------
(In thousands, except share amounts)                                                              1998         1997
- - ------------------------------------------------------------------------------------------------------------------------
                                                                                                       
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.




                                       20


EMCON
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY



- - ----------------------------------------------------------------------------------------------------------------------------
                                                                                             Unrealized
                                                                                             Gain (Loss)
                                                                                                 on             Total
                                                         Common Stock          Retained      Marketable     Shareholders'
(In thousands)                                        Shares      Amount       Earnings      Securities         Equity
- - ----------------------------------------------------------------------------------------------------------------------------
                                                                                                
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
                                                     -----------------------------------------------------------------------

See accompanying notes.




                                       21





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

Increase (decrease) in cash and cash equivalents (in thousands)                         1998          1997           1996
- - ---------------------------------------------------------------------------------------------------------------------------
                                                                                                         
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
- - ---------------------------------------------------------------------------------------------------------------------------

See accompanying notes.




                                       22



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



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.




Property and Equipment:  Property and equipment consists of (in thousands):
- - -------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                                      1998             1997
- - -------------------------------------------------------------------------------------------------------------------------
                                                                                                            
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
- - -------------------------------------------------------------------------------------------------------------------------


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



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



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





Segment Information

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

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

Year ended December 31, 1998                     Consulting         Lab       Total
- - --------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
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.



                                       27





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

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

                                                                              1998            1997             1996
- - ----------------------------------------------------------------------------------------------------------------------
                                                                                                    
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)
- - ----------------------------------------------------------------------------------------------------------------------






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

As of December 31,                                                           1998               1997            1996
- - ----------------------------------------------------------------------------------------------------------------------
                                                                                                      
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
- - ----------------------------------------------------------------------------------------------------------------------




                                       28





3.  Contracts in Progress

Information related to contracts in progress (in thousands):
- - ----------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                                         1998              1997
- - ----------------------------------------------------------------------------------------------------------------------------
                                                                                                               
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)
- - ----------------------------------------------------------------------------------------------------------------------------





Included  in the  accompanying  consolidated  balance  sheets  on an  individual
contract basis are (in thousands):
- - ----------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                                         1998              1997
- - ----------------------------------------------------------------------------------------------------------------------------
                                                                                                             
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)
- - ----------------------------------------------------------------------------------------------------------------------------


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



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



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



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



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





13.  Long-term Debt

Long-term debt consists of the following (in thousands):
- - -------------------------------------------------------------------------------------------- -------------- -------------
Years Ended December 31,                                                                         1998           1997
- - -------------------------------------------------------------------------------------------- -------------- -------------
                                                                                                          
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
- - -------------------------------------------------------------------------------------------------------------------------


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



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.




A summary of activity of the Plans follows:
- - --------------------------------------------------------------------------------------------------------------------------
                                                                                  Options Outstanding
                                                               -----------------------------------------------------------
                                               Available            Number               Price              Aggregate
                                               for Grant           of Shares           Per Share              Value
- - --------------------------------------------------------------------------------------------------------------------------
                                                                                                       
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
- - --------------------------------------------------------------------------------------------------------------------------



                                       35



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.





- - ------------------------------------------------------------------------------------------------------------------------------
                                                             Options                                      ESPP
                                                             -------                                      ----
                                                1998            1997           1996          1998         1997         1996
- - ------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
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%
- - ------------------------------------------------------------------------------------------------------------------------------


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:



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

In thousands except for earnings (loss) per share information                           1998         1997            1996
- - ------------------------------------------------------------------------------------------------------------------------------
                                                                                                          
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)
- - ------------------------------------------------------------------------------------------------------------------------------


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





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
- - --------------------------------------------------------------------------------------------------------------------------
                                                                                              
     $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
- - --------------------------------------------------------------------------------------------------------------------------


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





15.  Earnings Per Share

- - ---------------------------------------------------------------------------------------------------------------------------
                                                                                     Years Ended December 31,
(In thousands, except for earnings per share)                                 1998               1997             1996
- - ---------------------------------------------------------------------------------------------------------------------------
                                                                                                       
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                --
                                                                          ========             =======          ========

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


(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


16.  Income Taxes

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




- - ---------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                           1998              1997           1996
- - ---------------------------------------------------------------------------------------------------------------------------
                                                                                                          
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)
- - ---------------------------------------------------------------------------------------------------------------------------


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):



- - ---------------------------------------------------------------------------------------------------------------------------
Years Ended December 31,                                                         1998              1997           1996
- - ---------------------------------------------------------------------------------------------------------------------------
                                                                                                             
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.



                                       39



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):



- - -------------------------------------------------------------------------------------------------------------------------------
As of December 31,                                                                                     1998          1997
- - -------------------------------------------------------------------------------------------------------------------------------
                                                                                                               
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
- - -------------------------------------------------------------------------------------------------------------------------------


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






18.  Quarterly Data (unaudited)

- - --------------------------------------------------------------------------------------------------------------------------
(In thousands                                               First             Second           Third          Fourth
except per share amounts)                                  Quarter           Quarter          Quarter         Quarter
- - --------------------------------------------------------------------------------------------------------------------------
                                                                                                 
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
- - --------------------------------------------------------------------------------------------------------------------------


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


                         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



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


                                     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


                                   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.



      Signature                                 Title                             Date
      ---------                                 -----                             ----
                                                                         
/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




                                       45



                                   SCHEDULE II

                                      EMCON
                        VALUATION AND QUALIFYING ACCOUNTS

                                 (In Thousands)





                                                               Additions
                                                              Charged to
                                           Balance             Costs and                         Balance
                                         at Beginning         Expenses or                        at End
                                          of Period            Bonuses        Write-Offs       of Period
                                         ------------         -----------     ----------       ---------  
                                                                                         
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





                                       46



                                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


                                                                    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


                                                                    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



                                                                    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


                                                                    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.



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