The following Proxy Card was inadvertently  left out of the original  Definitive
Proxy Statement filing of April 17, 1996.  


                                       1

                                      PROXY

                   PROXY FOR ANNUAL MEETING OF SHAREHOLDERS OF
                                      EMCON
   THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF THE COMPANY

   The undersigned  hereby appoints  Douglas P. Crane and Eugene M. Herson,  and
each of them, as proxies for the  undersigned,  with full power of substitution,
to vote any and all shares of Common  Stock in EMCON (the  "Company"),  held by,
owned by or standing in the name of the  undersigned  on the Company's  books on
March 29, 1996 at the Annual Meeting of Shareholders of the Company,  to be held
at 1921  Ringwood  Avenue,  San Jose,  California  on May 17, 1996 at 3:00 p.m.,
local time, and at any continuation or adjournment thereof,  with all the powers
which the undersigned would possess if personally present at the meeting.

   The undersigned hereby directs and authorizes said proxies, and each of them,
or their  substitute  or  substitutes,  to vote as  hereinabove  specified  with
respect to the two  proposals on the reverse  side,  or if no  specification  is
made,  to vote in favor  thereof.  The shares  represented  by the Proxy will be
voted in accordance with specifications made in this Proxy.

   The undersigned  hereby further confers upon such proxies,  and each of them,
or their substitute or substitutes,  discretionary  authority to vote in respect
to all  other  matters  which  may  properly  come  before  the  meeting  or any
continuation or adjournment thereof.

   The  undersigned  hereby  acknowledges  receipt  of (a) the  Notice of Annual
Meeting,  (b) the  accompanying  Proxy Statement and (c) an Annual Report of the
Company for the fiscal year ended December 31, 1995 and hereby expressly revokes
any and all proxies heretofore given or executed by the undersigned with respect
to the shares of stock  represented by this Proxy, and by filing this Proxy with
the Secretary of the Company, gives notice of such revocation.

                        (To be signed on the other side)

                                        X
                                   Please mark
                                   your votes
                                    as this.

                                       FOR
                               all nominees listed
                             below (except as marked
                                to the contrary)
                                    WITHHOLD
                                    AUTHORITY
                                 to vote for all
                              nominees listed below

The Board of Directors recommends 
a vote "FOR" the following:
                         
     FOR   AGAINST   ABSTAIN 

1. Election of the following directors:

  Nominees:
Douglas P. Crane     Eugene M. Herson
Donald R. Andres     H. Lee Fortier
Richard A. Peluso    Stephen W. Vincent
Jack M. Marzluft     Donald R. Kerstetter
Peter Vardy

2. Ratification  of the  appointment  of  Ernst  &  Young  LLP as the  Company's
   independent auditors.
                       
WHETHER  OR NOT YOU PLAN TO  ATTEND  THE  MEETING  IN  PERSON,  PLEASE  SIGN AND
PROMPTLY  MAIL THIS  PROXY IN THE  RETURN  ENVELOPE  SO THAT  YOUR  STOCK MAY BE
REPRESENTED AT THE MEETING.
                         
Sign exactly as your name appears on your stock certificate.  If shares of stock
stand of record in the names of two or more  persons  or in the name of  husband
and wife,  whether as joint  tenants or  otherwise,  both or all of such persons
should sign this Proxy.  If shares of stock are held of record by a corporation,
this  Proxy  should be  executed  by the  President  or Vice  President  and the
Secretary,  and the  corporate  seal  should be affixed  thereto.  Executors  or
administrators  or other  fiduciaries who execute the above Proxy for a deceased
shareholder should give their full title. Please date this proxy. 
(INSTRUCTIONS:To withhold authority to vote for any individual nominee, strike a
line through that nominee's name in the list above.)
                      

Signature(s)______________________________________ Dated:________________, 1996
                              s FOLD AND DETACHHERE s