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      air  pollutant from such  source will be offset  by an equal or

      greater  decrease  in  the  quantity of  emissions  of  another

      hazardous air pollutant (or  pollutants) from such source which

      is deemed  more hazardous, pursuant  to guidance issued  by the

      Administrator under subparagraph (B).  The owner or operator of

      such source shall submit a showing to the Administrator (or the

      State) that such  increase has been offset under  the preceding

      sentence.

         "(B) The Administrator  shall, after notice  and opportunity

      for  comment and not  later than  18 months  after the  date of

      enactment of  the  Clean Air  Act Amendments  of 1990,  publish

      guidance  with respect  to implementation  of  this subsection.

      Such guidance  shall include  an identification, to  the extent

      practicable, of  the relative hazard to  human health resulting

      from emissions to  the ambient  air of each  of the  pollutants

      listed under subsection (b) sufficient to facilitate the offset

      showing authorized  by subparagraph  (A).  Such  guidance shall

      not  authorize offsets between  pollutants where  the increased

      pollutant  (or  more  than  one   pollutant  in  a  stream   of

      pollutants) causes adverse effects to human health for which no

      safety threshold  for exposure  can be determined  unless there

      are corresponding decreases in such types of pollutant(s).

      "(2) Construction, reconstruction and modifications.-

         "(A) After  the effective  date of  a permit  program  under

      title V  in any State, no  person may modify a  major source of

      hazardous   air   pollutants   in  such   State,   unless   the

      Administrator  (or  the  State)  determines  that  the  maximum

      achievable  control technology  emission limitation  under this

      section for  existing sources will be met.   Such determination

      shall be made on a case-by-case basis where no ap-

      plicable  emissions  limitations have  been established  by the

      Administrator.

         "(B)  After  the effective  date of  a permit  program under

      title  V in any State,  no person may  construct or reconstruct

      any  major  source  of  hazardous air  pollutants,  unless  the

      Administrator  (or  the  State)  determines  that  the  maximum

      achievable  control technology  emission limitation  under this

      section  for new sources will be met.  Such determination shall

      be made  on a case-by-case  basis where no  applicable emission

      limitations have been established by the Administrator.

      "(3)  Procedures for  modifications.-The Administrator  (or the

   State)  shall establish  reasonable procedures  for  assuring that

   the requirements applying to modifications under  this section are

   reflected in the permit.

   "(h) Work Practice Standards and Other Requirements.-

      "(1) In general.-For  purposes of  this section, if  it is  not

   feasible in  the judgment  of the  Administrator  to prescribe  or

   enforce  an emission  standard  for  control of  a  hazardous  air

   pollutant or pollutants,  the Administrator may, in  lieu thereof,

   promulgate  a  design,  equipment, work  practice,  or operational

   standard,  or combination  thereof, which  in the  Administrator's

   judgment is consistent  with the provisions of  subsection (d)  or

   (f).   In  the  event the  Administrator  promulgates a  design or

   equipment standard  under this subsection, the Administrator shall

   include as part  of such standard such requirements as will assure

   the  proper  operation and  maintenance  of  any  such element  of

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