Page:United States Statutes at Large Volume 104 Part 4.djvu/221

 PUBLIC LAW 101-549—NOV. 15, 1990 104 STAT. 2537 petition prior to promulgating any emission standards pursuant to subsection (d) applicable to any source category or subcategory of a listed hazardous air pollutant without a CAS number listed under subsection (b) for which a deletion petition has been filed within 12 months of the date of enactment of the Clean Air Act Amendments of 1990. "(4) FURTHER INFORMATION. —I f the Administrator determines that information on the health or environmental effects of a substance is not sufficient to make a determination required by this subsection, the Administrator may use any authority available to the Administrator to acquire such information. "(5) TEST METHODS.—The Administrator may establish, by rule, test measures and other analj^ic procedures for monitoring and measuring emissions, ambient concentrations, deposition, and bioaccumulation of hazardous air pollutants. " (6) PREVENTION OF SIGNIFICANT DETERIORATION. — The provisions of part C (prevention of significant deterioration) shall not apply to pollutants listed under this section. "(7) LEAD.— The Administrator may not list elemental lead as a hazardous air pollutant under this subsection. ' (c) LIST OF SOURCE CATEGORIES. — "(1) IN GENERAL. —Not later than 12 months after the date of enactment of the Clean Air Act Amendments of 1990, the Administrator shall publish, and shall from time to time, but no less often than every 8 years, revise, if appropriate, in response to public comment or new information, a list of all categories and subcategories of major sources and area sources (listed under paragraph (3)) of the air pollutants listed pursuant to subsection (b). To the extent practicable, the categories and subcategories listed under this subsection shall be consistent with the list of source categories established pursuant to section 111 and part C. Nothing in the preceding sentence limits the Administrator's authority to establish subcategories under this section, as appropriate. "(2) REQUIREMENT FOR EMISSIONS STANDARDS. —For the categories and subcategories the Administrator lists, the Administrator shall establish emissions standards under subsection (d), according to the schedule in this subsection and subsection (e). "(3) AREA SOURCES. —The Administrator shall list under this Regulations, subsection each category or subcategory of area sources which the Administrator finds presents a threat of adverse effects to human health or the environment (by such sources individually or in the aggregate) warranting regulation under this section. The Administrator shall, not later than 5 years after the date of enactment of the Clean Air Act Amendments of 1990 and pursuant to subsection (k)(3)(B), list, based on actual or estimated aggregate emissions of a listed pollutant or pollutants, sufficient categories or subcategories of area sources to ensure that area sources representing 90 percent of the area source emissions of the 30 hazardous air pollutants that present the greatest threat to public health in the largest number of urban areas are subject to regulation under this section. Such regulations shall be promulgated not later than 10 years after such date of enactment. "(4) PREVIOUSLY REGULATED CATEGORIES. —The Administrator may, in the Administrator's discretion, list any category or subcategory of sources previously regulated under this section

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