June 19, 1996


Perma-Fix Environmental Services, Inc.
1940 N.W. 67th Place
Gainesville, FL  32653
Attention:  Robert W. Foster, Jr.

       RE:     LOAN AND SECURITY AGREEMENT DATED AS OF JANUARY 27, 1995
       (THE  LOAN AGREEMENT ), AS AMENDED, BETWEEN PERMA-FIX
       ENVIRONMENTAL SERVICES, INC., A DELAWARE CORPORATION
       ( PARENT ) AND EACH OF THOSE DIRECT AND INDIRECT
       SUBSIDIARIES OF PARENT WHOSE NAMES ARE INSCRIBED ON THE
       SIGNATURE PAGES OF THE LOAN AGREEMENT (COLLECTIVELY, WITH
       PARENT,  BORROWERS  OR INDIVIDUALLY, A  BORROWER ) AND
       HELLER FINANCIAL, INC., A DELAWARE CORPORATION ( LENDER )
       
       Gentlemen:
       
       Reference is made to the Loan Agreement.  Capitalized terms
  used but not defined herein shall have the meanings assigned
  to such terms in the Loan Agreement.
  
  This letter evidences the agreement of Lender and Borrower as
  follows:
  
     1.   Establishment of Overformula Line.  (a)  Lender
  shall make available to Borrower, during the Overformula Line
  Period (as defined below), a temporary overformula line of
  credit ( Overformula Line ) in the amount of the Overformula
  Line Amount (as defined below).  As a result of the
  establishment of the Overformula Line, during the Overformula
  Line Period, the aggregate outstanding amount of Revolving
  Loans may exceed the Borrowing Base by an amount of up to the
  Overformula Line Amount, provided that in no event shall the
  aggregate outstanding amount of Revolving Loans at any time
  exceed the Revolving Loan Commitment amount.  On the last day
  of the Overformula Line Period, the Overformula Line shall
  terminate, and Borrower shall pay to Lender, in immediately
  available funds, without demand or notice, all outstanding


  advances under the Overformula Line, together with all accrued
  but unpaid interest thereon.
  
          (b)  As used herein, the term  Overformula Line
  Period  shall mean the period commencing on the date of the
  first advance to Borrower under the Overformula Line and
  ending on the earliest of (i) 90 days after the date of such
  first advance, (ii) September 30, 1996, (iii) the termination
  of the Revolving Loan Commitment pursuant to subsection 8.3 of
  the Loan Agreement, or (iv) the Termination Date.
  
          (c)  As used herein, the term  Overformula Line
  Amount  means, at any time of determination thereof, $250,000.
  
          (d)  The making of advances by Lender to Borrower
  under the Overformula Line shall be subject to all of the
  terms and conditions set forth in the Loan Agreement for the
  making of advances under the Revolving Loan, including,
  without limitation, satisfaction of the conditions set forth
  in subsection 3.1 of the Loan Agreement, with the exception of
  section 3.1(c) and 3.1(f).  All advances under the Overformula
  Line shall constitute Obligations, shall bear interest at the
  same rate of interest applicable to all other advances under
  the Revolving Loan and shall be secured by Lender s security
  interest in the Collateral and by all other security
  interests, liens, mortgages, claims, and encumbrances now or
  from time to time hereafter granted by Borrower to Lender.
  
     2.   Overformula Line Fee.  As consideration for Lender s
  establishment of the Overformula Line, Borrower shall pay to
  Lender on the last day of each month during which any advance
  of the Overformula Line is outstanding a fee in the amount of
  one percent (1%) per month of the average daily balance under
  the Overformula Line.  This fee shall be in addition to all
  other fees that are due and payable under the Loan Agreement.
  
     3.   Conditions.  The effectiveness of the Overformula
  Line and the obligation of Lender to make advances to Borrower
  thereunder are subject to satisfaction of the following:
  
          (a)  Borrower shall have duly executed and delivered
  this letter agreement;
  
          (b)  Louis Centafoni will provide a one hundred
  thousand dollar ($100,000) equity infusion in Borrowers prior
  to any advance under the Overformula Line.
  

     4.   Loan Agreement Representations.  All of the
  representations set forth in the Loan Agreement are accurate
  in all material respects as of the date hereof.
  
  Please evidence your acknowledgment of and agreement to the
  terms and conditions of this letter by executing this letter
  in the place indicated below.
  
  Cordially,
  
  HELLER FINANCIAL, INC.
  
  
  By: ________________________
  Its: _________________________
  
  
  
  
  
  (SIGNATURES CONTINUED ON NEXT PAGE)
                                 
  
  Accepted and Agreed this 21st day of June, 1996.
  
  PERMA-FIX ENVIRONMENTAL SERVICES, INC.,
  a Delaware corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  INDUSTRIAL WASTE MANAGEMENT, INC.,
  a Missouri corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  PERMA-FIX, INC., an Oklahoma
  corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  
  (SIGNATURES CONTINUED ON NEXT PAGE)
 
                          
  PERMA-FIX OF DAYTON, INC., a
  Ohio corporation
  
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  PERMA-FIX OF FLORIDA, INC., a
  Florida corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  PERMA-FIX OF FORT LAUDERDALE,
  INC., a Florida corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  
  
  (SIGNATURES CONTINUED ON NEXT PAGE)
  
                               
  PERMA-FIX OF MEMPHIS, INC., 
  a Tennessee corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  PERMA-FIX OF NEW MEXICO, INC.,
  a New Mexico corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  PERMA-FIX TREATMENT SERVICES, INC.,
  an Oklahoma corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  
  (SIGNATURES CONTINUED ON NEXT PAGE)
                            
  
  SCHREIBER, GRANA & YONLEY, INC.,
  a Missouri corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  MINTECH, INC., an Oklahoma
  corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________
  
  
  RECLAMATION SERVICES, INC.,
  an Oklahoma corporation
  
  
  By: __________________________
  Name: ________________________
  Title: _________________________
  
  Attest: ________________________
  Name: ________________________
  Title: _________________________