First Amendment to Stock Option Agreement dated July 27, 2017 between Perma-Fix Environmental Services, Inc. Mr. Robert L. Ferguson

FIRST AMENDMENT

to

2017 STOCK OPTION PLAN NONQUALIFIED STOCK OPTION AGREEMENT DATED JULY 27, 2017, BY AND BETWEEN PERMA-FIX ENVIRNOMENTAL SERVICES, INC. AND ROBERT FERGUSON (“CONSULTANT”)

(“2017 NONQUALIFED STOCK OPTION AGREEMENT”)

WHEREAS, on July 27, 2017, Robert Ferguson (the “Consultant”) and Perma-Fix Environmental Services, Inc. (the “Company”) entered into the 2017 Nonqualified Stock Option Agreement.

WHEREAS, Section 4 of the 2017 Nonqualified Stock Option Agreement provides that the exercise of a certain number of options is subject to attainment of the following goals: (a) Upon treatment and disposal of three (3) gallons of waste at the Company’s PFNWR facility on or before January 27, 2018, 10,000 shares of the Options shall become exercisable; (b) Upon treatment and disposal of two thousand (2,000) gallons of waste at the Company’s PFNWR facility on or before January 27, 2019, 30,000 shares of the Option shall become exercisable; and (c) Upon treatment and disposal of fifty thousand (50,000) gallons of waste at the Company’s PFNWR facility and assistance, on terms satisfactory to the Company, in preparing appropriate justifications of cost and pricing date for the waste, and obtaining a long-term commercial contract relating to the treatment, storage and disposal of waste on or before January 27, 2021, sixty thousand (60,000) shares of the Option shall become exercisable;.

WHEREAS, this First Amendment to the 2017 Nonqualified Stock Option Agreement (the “Amendment”) was approved by the Compensation and Stock Option Committee (“the Compensation Committee”) and the Board of Directors (the “Board”) of the Company on January 17, 2019, amending the date as noted for goal in letter “(b)” in Section 4 of the 2017 Nonqualified Stock Option Agreement.

NOW, THEREFORE, the 2017 Nonqualified Stock Option Agreement is hereby amended as follows:

The 2017 Nonqualified Stock Option Agreement is hereby amended and modified by this Amendment only to the extent specifically amended or modified by this Amendment. None of the other terms, conditions or provisions of the Employment Agreement is amended or modified by this Amendment.