Page:United States Statutes at Large Volume 86.djvu/899

 86 STAT. ]

PUBLIC LAW 92-500-OCT. 18, 1972

857

the usual or potential presence of the affected organisms in any waters, the importance of the affected organisms and the nature and extent of the effect of the toxic pollutant on such organisms, and he Hearing. shall publish a notice for a public hearing on such proposed standard to be held within thirty days. As soon as possible after such hearing, but not later than six months after publication of the proposed effluent standard (or prohibition), unless the Administrator finds, on the record, that a modification of such proposed standard (or prohibition) is justified based upon a preponderance of evidence adduced at such hearings, such standard (or prohibition) shall be pi.'omulgated. "(3) If after a public hearing the Administrator finds that a modi- Revised effluent fication of such proposed standard (or prohibition) is justified, a standard. revised effluent standard (or prohibition) for such pollutant or combination of pollutants shall be promulgated immediately. Such standard (or prohibition) shall be reviewed and, if appropriate, revised at least every three years. "(4) Any effluent standard promulgated under this section shall be at that level which the Administrator determines provides an ample margin of safety. "(5) When proposing or promulgating any effluent standard (or prohibition) under this section, the Administrator shall designate the category or categories of sources to which the effluent standard (or prohibition) shall apply. Any disposal of dredged material may be included in such a category of sources after consultation with the Secretary of the Army. "(6) Any effluent standard (or prohibition) established pursuant to Effective date. this section shall take effect on such date or dates as specified in the order promulgating such standard, but in no case more than one year from the date of such promulgation. "(7) Prior to publishing any regulations pursuant to this section the Administrator shall, to the maximum extent practicable within the time provided, consult with appropriate advisory committees. States, independent experts, and Federal departments and agencies. Pretreatment " (b)(1) The Administrator shall, within one hundred and eighty tandards, prodays after the date of enactment of this title and from time to time posed regulations. thereafter, publish proposed regulations establishing pretreatment publication standards for introduction of pollutants into treatment works (as defined in section 212 of this Act) which are publicly owned for those pollutants which are determined not to be susceptible to treatment by such treatment works or which would interfere with the operation of such treatment works. Not later than ninety days after such publication, and after opportunity for public hearing, the Administrator shall promulgate such pretreatment standards. Pretreatment standards under this subsection shall specify a time for compliance not to exceed three years from the date of promulgation and shall be established to prevent the discharge of any pollutant through treatment works (as defined in section 212 of this Act) which are publicly owned, which pollutant interferes with, passes through, or otherwise is incompatible with such works. ' "(2) The Administrator shall, from time to time, as control technology, processes, operating methods, or other alternatives change, revise such standards following the procedure established by this subsection for promulgation of such standards. "(3) When proposing or promulgating any pretreatment standard under this section, the Administrator shall designate the category or categories of sources to which such standard shall apply. "(4) Nothing in this subsection shall affect any pretreatment requirement established by any State or local law not in conflict with any pretreatment standard established under this subsection.

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