«E2ff^'^"-; PUBLIC LAW 104-182—AUG. 6, 1996 110 STAT. 1631 fied to address the objections of the Administrator and be resubmitted for approval. "(iv) REVIEW. —The Administrator shall periodically, but not less often than every 5 years, review each multimedia mitigation program approved under this subparagraph to determine whether it continues to meet the requirements of clause (iii) and shall, after written notice to the State and an opportunity for the State to correct any deficiency in the program, withdraw approval of programs that no longer comply with such requirements. "(v) EXTENSION.—I f, within 90 days after the promulgation of an Edtemative maximum contaminant level under subparagraph (F), the Grovernor of a State submits a letter to the Administrator committing to develop a multimedia mitigation program under this subparagraph, the effective date of the national primary drinking water regulation for radon in the State that would be applicable under paragraph (10) shall be extended for a period of 18 months. "(vi) LOCAL PROGRAMS. —In the event that a State chooses not to submit a multimedia mitigation program for approval under this subparagraph or has submitted a program that has been disapproved, any public water system in the State may submit a program for approval by the Administrator according to the same criteria, conditions, and approval process that would apply to a State program. The Administrator shall approve a multimedia mitigation program if the health risk reduction benefits expected to be achieved by the program are equal to or greater than the health risk reduction benefits that would result from compliance by the public water system with the maximum contaminant level for radon promulgated under subparagraph (E).". SEC. 110. RECYCLING OF FILTER BACKWASH. Section 1412(b) (42 U.S.C. 300g -l(b)) is amended by adding the following new paragraph after paragraph (13): "(14) RECYCLING OF FILTER BACKWASH.— The Administrator shall promulgate a regulation to govern the recycling of filter backwash water within the treatment process of a public water system. The Administrator shall promulgate such regulation not later than 4 years after the date of enactment of the Safe Drinking Water Act Amendments of 1996 unless such recycling has oeen addressed by the Administrator's Enhanced Surface Water Treatment Rule prior to such date.". SEC. 111. TECHNOLOGY AND TREATMENT TECHNIQUES. (a) VARIANCE TECHNOLOGIES. — Section 1412(b) (42 U.S.C. 300g- 1(b)) is amended by adding the following new paragraph afler paragraph (14): "(15) VARIANCE TECHNOLOGIES. — "(A) IN GENERAL.— At the same time as the Administrator promulgates a national primary drinking water regulation for a contaminant pursuant to this section, the Administrator shall issue guidance or regulations describing the best treatment technologies, treatment techniques. Regulations. Regulations.