PUBLIC LAW 101-549—NOV. 15, 1990 104 STAT. 2467 need for revision, or implementation of any plan or plan revision required under this Act.", (e) NEW SOURCE STANDARDS OF PERFORMANCE. —(1) Section llKbXlXB) of the Clean Air Act (42 U.S.C. 7411(b)(l)(B)) is amended as follows: (A) Strike "120 days" and insert "one year". (B) Strike "90 days" and insert "one year". (C) Strike "four years" and insert "8 years". (D) Immediately before the sentence beginning "Standards of performance or revisions thereof insert "Notwithstanding the requirements of the previous sentence, the Administrator need not review any such standard if the Administrator determines that such review is not appropriate in light of readily available information on the efficacy of such standard.". (E) Add the following at the end: "When implementation and enforcement of any requirement of this Act indicate that emission limitations and percent reductions beyond those required by the standards promulgated under this section are achieved in practice, the Administrator shall, when revising standards promulgated under this section, consider the emission limitations and percent reductions achieved in practice.". (2) Section lll(f)(l) of the Clean Air Act (42 U.S.C. 7411(fKl)) is amended to read as follows: "(1) For those categories of major stationary sources that the Regulations. Administrator listed under subsection (b)(l)(A) before the date of the enactment of the Clean Air Act Amendments of 1990 and for which regulations had not been proposed by the Administrator by such date, the Administrator shall— "(A) propose regulations establishing standards of performance for at least 25 percent of such categories of sources within 2 years after the date of the enactment of the Clean Air Act Amendments of 1990; "(B) propose regulations establishing standards of performance for at least 50 percent of such categories of sources within 4 years after the date of the enactment of the Clean Air Act Amendments of 1990; and "(C) propose regulations for the remaining categories of sources within 6 years after the date of the enactment of the Clean Air Act Amendments of 1990.". (f) SAVINGS CLAUSE.—Section lll(a)(3) of the Clean Air Act (42 U.S.C. 7411(fKl)) is amended by adding at the end: "Nothing in title II of this Act relating to nonroad engines shall be construed to apply to stationary internal combustion engines.". (g) REGULATION OF EXISTING SOURCES.— Section lll(d)(l)(A)(i) of the Clean Air Act (42 U.S.C. 7411(d)(l)(A)(i)) is amended by striking "or 112(b)(l)(A)" and inserting "or emitted from a source category which is regulated under section 112". (h) CONSULTATION. — The penultimate sentence of section 121 of the Clean Air Act (42 U.S.C. 7421) is amended to read as follows: "The Administrator shall update as necessary the original regula- Regulations. tions required and promulgated under this section (as in effect immediately before the date of the enactment of the Clean Air Act Amendments of 1990) to ensure adequate consultation.", (i) DELEGATION,—The second sentence of section 301(a)(l) of the Clean Air Act (42 U,S.C, 7601(a)(l)) is amended by inserting "subject to section 307(d)" immediately following "regulations".
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