THIRD
AMENDED, RESTATED AND SUBSTITUTED

REVOLVING CREDIT NOTE


 


	$18,000,000	August
    2, 2013




 


This
Third Amended, Restated and Substituted Revolving Credit Note is executed and delivered under and pursuant to the terms of that
certain Amended and Restated Revolving Credit, Term Loan and Security Agreement dated as of October 31, 2011 (as amended, restated,
supplemented or modified from time to time, the “Credit Agreement”) by and among the undersigned, as Borrower,
the various financial institutions named therein or which hereafter become a party thereto (each individually a “Lender”
and collectively, “Lenders”) and PNC BANK, NATIONAL ASSOCIATION (in its individual capacity, “PNC”),
as agent for Lenders (in such capacity, “Agent”). Capitalized terms not otherwise defined herein shall have
the meanings provided in the Credit Agreement.


 


FOR
VALUE RECEIVED, the Borrower hereby promises, to pay to the order of PNC BANK, NATIONAL ASSOCIATION (“Payee”), at
the office of Agent located at PNC Bank Center, Two Tower Center, 8th Floor, East Brunswick, New Jersey 08816 or at such other
place as Agent may from time to time designate to Borrower in writing:


 


(i)       the
principal sum of EIGHTEEN MILLION DOLLARS ($18,000,000) or, if different, from such amount, the unpaid principal balance of Payee’s
Commitment Percentage of the Revolving Advances as may be due and owing under the Credit Agreement, payable in accordance with
the provisions of the Credit Agreement, subject to acceleration upon the occurrence of an Event of Default under the Credit Agreement
or earlier termination of the Credit Agreement pursuant to the terms thereof; and


 


(ii)       interest
on the principal amount of the Revolving Advances under this Revolving Credit Note from time to time outstanding until such principal
amount is paid in full at the applicable Revolving Rate in accordance with the provisions of the Credit Agreement. In no event,
however, shall interest exceed the amount collectible at the maximum interest rate permitted by law. Upon and after the occurrence
of an Event of Default, and during the continuation thereof, interest shall be payable at the Default Rate.


 


This
Revolving Credit Note is one of the Revolving Credit Notes referred to in the Credit Agreement and is secured by the liens granted
pursuant to the Credit Agreement and the Other Documents, is entitled to the benefits of the Credit Agreement and the Other Documents
and is subject to all of the agreements, terms and conditions therein contained.


 


This
Revolving Credit Note is subject to mandatory prepayment and may be voluntarily prepaid, in whole or in part, on the terms and
conditions set forth in the Credit Agreement.


 


If
an Event of Default under Section 10.7 of the Credit Agreement shall occur, then this Revolving Credit Note shall immediately
become due and payable, without notice, together with reasonable attorneys’ fees if the collection hereof is placed in the
hands of an attorney to obtain or enforce payment hereof. If any other Event of Default shall occur under the Credit Agreement
or any of the Other Documents, and the same is not cured within any applicable grace or cure period, then this Revolving Credit
Note may, as provided in the Credit Agreement, be declared to be immediately due and payable, without notice, together with reasonable
attorneys’ fees, if the collection hereof is placed in the hands of an attorney to obtain or enforce payment hereof.


 




    	 	 	 



    	 



    

This
Revolving Credit Note shall be construed and enforced in accordance with the laws of the State of New York.


 


The
Borrower expressly waives any presentment, demand, protest, notice of protest, or notice of any kind except as expressly provided
in the Credit Agreement.


 


This
Revolving Credit Note is an amendment to, and is in substitution and replacement of, that certain Second Amended, Restated and
Substituted Revolving Credit Note dated as of October 31, 2011 in the amount of $25,000,000 (the “Replaced Note”).
This Revolving Credit Note represents the same indebtedness as the Replaced Note and is secured by the same collateral securing
the Replaced Note and is not intended to constitute a novation in any manner whatsoever.


 


	 	PERMA-FIX
    ENVIRONMENTAL SERVICES, INC., 

    a Delaware corporation
	 	 
	 	By:	/s/Ben
    Naccarato
	 	Name:	Ben
    Naccarato
	 	Title:	CFO