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      compliance  as expeditiously  as practicable,  but in  no event

      later than 3 years  after the effective date of  such standard,

      except  as  provided in  subparagraph  (B)  and paragraphs  (4)

      through (8).

         "(B) The Administrator  (or a State with a  program approved

      under  title V)  may issue  a permit  that grants  an extension

      permitting an existing source up to 1 additional year to comply

      with standards  under subsection (d) if  such additional period

      is necessary for  the installation of controls.   An additional

      extension  of up  to 3  years  may be  added  for mining  waste

      operations, if  the 4-year  compliance time is  insufficient to

      dry and cover mining  waste in order to reduce emissions of any

      pollutant listed under subsection (b).

      "(4)  Presidential  exemption.-The  President  may  exempt  any

   stationary source from compliance with any  standard or limitation

   under this section for a  period of not more  than 2 years if  the

   President  determines  that   the  technology  to  implement  such

   standard is not available and that it is  in the national security

   interests  of the United States to do so.  An exemption under this

   paragraph may be extended for  1 or more additional  periods, each

   period  not to  exceed 2  years.   The  President shall  report to

   Congress with  respect to  each exemption  (or extension  thereof)

   made under this paragraph.

   "(5) Early reduction.-

         "(A) The  Administrator (or  a State  acting pursuant  to  a

      permit program  approved under  title V) shall  issue a  permit

      allowing an existing  source, for which  the owner or  operator

      demonstrates that the source has achieved a reduction of 90 per

      centum or more in emissions of hazardous air pollutants (95 per

      centum  in  the case  of  hazardous  air pollutants  which  are

      particulates) from the source,  to meet an alternative emission

      limitation  reflecting such  reduction in  lieu of  an emission

      limitation promulgated under subsection  (d) for a period  of 6

      years  from the  compliance date  for the  otherwise applicable

      standard, provided  that such reduction is  achieved before the

      otherwise  applicable standard  under subsection  (d) is  first

      proposed.   Nothing in  this paragraph  shall preclude  a State

      from requiring reductions in excess of those  specified in this

      subparagraph  as   a  condition   of  granting   the  extension

      authorized by the previous sentence.

         "(B)  An  existing  source   which  achieves  the  reduction

      referred  to  in  subparagraph (A)  after  the  proposal  of an

      applicable  standard but  before January  1, 1994,  may qualify

      under  subparagraph (A),  if  the source  makes an  enforceable

      commitment to achieve such reduction before the proposal of the

      standard.   Such commitment  shall be  enforceable to  the same

      extent as a regulation under this section.

         "(C)  The  reduction shall  be  determined  with  respect to

      verifiable and actual emissions in a base year not earlier than

      calendar year  1987, provided that,  there is no  evidence that

      emissions in  the base  year are artificially  or substantially

      greater than  emissions in other years  prior to implementation

      of emissions reduction measures.  The Administrator may allow a

      source to use a baseline year of 1985 or 1986 provided that the

      source can demonstrate to the satisfaction of the Administrator

      that  emissions data  for the  source reflects  verifiable data

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