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   standards  applicable under  the  Low-Emission  Vehicle and  Clean

   Fuels Regulations of the California Air  Resources Board (`CARB');

   and

      "(2) subject to  the same requirements, and  utilizing the same

   interpretations and  policy judgments,  as are  applicable in  the

   case of  such  CARB  standards,  including, but  not  limited  to,

   requirements  regarding  certification,  production-line  testing,

   and in-use compliance,

unless  the  Administrator  determines  (in   promulgating  the  rules

establishing  the clean fuel vehicle program  under this section) that

any  such administration and  enforcement would not  meet the criteria

for a waiver under section 209. Nothing in this section shall apply in

the case of standards under section 245 for heavy-duty vehicles.

"SEC. 245.  STANDARDS FOR  HEAVY-DUTY CLEAN-FUEL VEHICLES  (GVWR ABOVE

8,500 UP TO 26,000 LBS).

   "(a) Model Years After  1997; Combined NOx and  NMHC Standard.-For

classes or  categories of heavy-duty vehicles  or engines manufactured

for the model  year 1998 or thereafter and having  a GVWR greater than

8,500 lbs. and up to  26,000 lbs. GVWR, the standards under  this part

for  clean-fuel  vehicles shall  require  that  combined emissions  of

oxides of  nitrogen (NOx) and nonmethane hydrocarbons (NMHC) shall not

exceed  3.15 grams per brake horsepower hour (equivalent to 50 percent

of the combined  emission standards applicable  under section 202  for

such  air pollutants in  the case  of a  conventional model  year 1994

heavy-duty  diesel-fueled vehicle  or  engine). No  standard shall  be

promulgated  as provided in this section for any heavy-duty vehicle of

more than 26,000 lbs. GVWR.

   "(b)   Revised  Standards   That   Are  Less   Stringent.-(1)  The

Administrator may promulgate a revised less stringent standard for the

vehicles or engines referred to in subsection (a) if the Administrator

determines that the 50 percent reduction required under subsection (a)

is not  technologically feasible for clean  diesel-fueled vehicles and

engines, taking into account durability, costs, lead time, safety, and

other   relevant  factors.   To   provide  adequate   lead  time   the

Administrator  shall   make  a   determination  with  regard   to  the

technological feasibility of such 50 percent reduction before December

31, 1993.

   "(2) Any  person may  at any  time petition  the Administrator  to

make a  determination under paragraph (1). The Administrator shall act

on such a petition within 6 months after the petition is filed.

   "(3) Any revised less stringent standards  promulgated as provided

in this subsection shall  require at least  a 30 percent reduction  in

lieu of the 50 percent reduction referred to in paragraph (1).

"SEC. 246. CENTRALLY FUELED FLEETS

   "(a) Fleet Program Required for Certain Nonattainment Areas.-

      "(1)  SIP revision.-Each State in which there is located all or

   part  of  a covered  area  (as  defined  in  paragraph (2))  shall

   submit, within 42  months after the enactment of the Clean Air Act

   Amendments of  1990, a  State implementation  plan revision  under

   section  110 and  part D  of  title I  to  establish a  clean-fuel

   vehicle program for fleets under this section.

      "(2) Covered  areas.-For purposes  of this subsection,  each of

   the following shall be a `covered area':

         "(A) Ozone nonattainment areas.-Any ozone nonattainment area

      with  a 1980  population of  250,000 or  more classified  under

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