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for a single nonattainment area.

   "(e)  Extension  of   Attainment  Date  for   Serious  Areas.-Upon

application by any State, the  Administrator may extend the attainment

date for a  Serious Area  beyond the date  specified under  subsection

(c),  if attainment by the date established under subsection (c) would

be impracticable,  the State  has complied with  all requirements  and

commitments pertaining to  that area in  the implementation plan,  and

the State demonstrates  to the satisfaction of  the Administrator that

the plan for  that area includes the most stringent  measures that are

included in the  implementation plan of any  State or are achieved  in

practice in any State, and can feasibly be implemented in the area. At

the time  of such application, the State must submit a revision to the

implementation plan that includes a demonstration of attainment by the

most expeditious alternative date practicable. In  determining whether

to grant an extension, and the appropriate length of time for any such

extension, the  Administrator may  consider the  nature and extent  of

nonattainment,  the types  and numbers  of sources  or other  emitting

activities  in the  area  (including the  influence of  uncontrollable

natural sources and  transboundary emissions from foreign  countries),

the population  exposed to concentrations  in excess of  the standard,

the presence and concentration of  potentially toxic substances in the

mix  of particulate emissions in  the area, and  the technological and

economic feasibility  of various control  measures. The  Administrator

may not approve  an extension  until the State  submits an  attainment

demonstration  for the area. The  Administrator may grant  at most one

such extension for an area, of no more than 5 years.

   "(f)  Waivers  for  Certain Areas.-The  Administrator  may,  on  a

case-by-case basis,  waive any  requirement applicable to  any Serious

Area  under  this  subpart  where the  Administrator  determines  that

anthropogenic sources of PM-10 do  not contribute significantly to the

violation of the  PM-10 standard  in the area.  The Administrator  may

also waive a  specific date for attainment  of the standard where  the

Administrator  determines  that  nonanthropogenic  sources   of  PM-10

contribute significantly to the violation of the PM-10 standard in the

area.

"SEC. 189. PLAN PROVISIONS AND SCHEDULES FOR PLAN SUBMISSIONS.

   "(a) Moderate Areas.-

      "(1)  Plan provisions.-Each  State in  which all  or part  of a

   Moderate  Area   is  located  shall   submit,  according  to   the

   applicable  schedule under  paragraph (2),  an implementation plan

   that includes each of the following:

         "(A) For the purpose of meeting the requirements of  section

      172(c)(5), a permit program  providing that permits meeting the

      requirements of  section 173 are required  for the construction

      and operation of new and  modified major stationary sources  of

      PM-10.

         "(B)  Either  (i) a  demonstration  (including  air  quality

      modeling)  that  the plan  will provide  for attainment  by the

      applicable  attainment  date;  or  (ii)  a  demonstration  that

      attainment by such date is impracticable.

         "(C)  Provisions to assure that reasonably available control

      measures for the control of PM-10 shall be implemented no later

      than December 10,  1993, or  4 years after  designation in  the

      case of  an area classified  as moderate after the  date of the

      enactment of the Clean Air Act Amendments of 1990.  

      "(2) Schedule  for plan  submissions.-A State shall  submit the

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