PUBLIC LAW 101-549—NOV. 15, 1990 104 STAT. 2473 rebuilding has on engine emissions. On the basis of that study and other information available to the Administrator, the Administrator may prescribe requirements to control rebuilding practices, including standards applicable to emissions from any rebuilt heavy-duty engines (whether or not the engine is past ite statutory useful life), which in the Administrator's judgment cause, or contribute to, air pollution which may reasonably be anticipated to endanger public health or welfare taking costs into account. Any regulation shall take effect after a period the Effective date. Administrator finds necessary to permit the development and application of the requisite control measures, giving appropriate consideration to the cost of compliance withm the period and energy and safety factors.". (2) Redesignate subparagraph (F) as subparagraph (E) and insert "MOTORCYCLES. —" before "For purposes of this paragraph". SEC. 202. CONTROL OF VEHICLE REFUELING EMISSIONS. Section 202(a)(6) of the Clean Air Act (42 U.S.C. 7521(a)(6)) is amended to read as follows: "(6) ONBOARD VAPOR RECOVERY. —Within 1 year after the date of the enactment of the Clean Air Act Amendments of 1990, the Administrator shall, after consultation with the Secretary of Trsmsportation regarding the safety of vehicle-based Conboard') systems for the control of vehicle refueling emissions, promulgate standards under this section requiring that new light-duty vehicles manufactured beginning in the fourth model year after the model year in which the standards are promulgated and thereafter shall be equipped with such systems. The standards required under this paragraph shall apply to a percentage of each manufacturer's fleet of new light-duty vehicles beginning with the fourth model year after the model year in which the standards are promulgated. The percentage shall be as specified in the following table: "IMPLEMENTATION SCHEDULE FOR ONBOARD VAPOR RECOVERY REQUIREMENTS Model year commencing after standards promulgated Fourth Fifth After Fifth Percentage * 40 80 100 ' Percentages in the table refer to a percentage of the manufacturer's sales volume. The standards shall require that such systems provide a minimum evaporative emission capture efficiency of 95 percent. The requirements of section 182(b)(3) (relating to stage II gasoline vapor recovery) for areas classified under section 181 as moderate for ozone shall not apply after promulgation of such standards and the Administrator may, by rule, revise or waive the application of the requirements of such section 182(b)(3) for areas classified under section 181 as Serious, Severe, or Extreme for ozone, as appropriate, after such time as the Administrator determines that onboard emissions control systems required under this paragraph are in widespread use throughout the motor vehicle fleet.'.
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