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   assessment, using authorities  under this  Act including  sections

   111 and this section.

      "(6)  Hydrofluoric acid.-Not later than  2 years after the date

   of  enactment  of  the  Clean  Air  Act  Amendments  of  1990, the

   Administrator shall,  for those  regions of  the country which  do

   not have comprehensive health and safety  regulations with respect

   to hydrofluoric  acid, complete a study  of the  potential hazards

   of  hydrofluoric  acid  and  the  uses  of  hydrofluoric  acid  in

   industrial and  commercial applications to  public health and  the

   environment considering  a range  of  events including  worst-case

   accidental   releases  and  shall   make  recommendations  to  the

   Congress for the reduction of such hazards, if appropriate.

      "(7)  RCRA   facilities.-In  the   case  of  any   category  or

   subcategory of  sources the  air emissions of  which are regulated

   under  subtitle   C  of   the  Solid   Waste  Disposal   Act,  the

   Administrator  shall take  into account  any  regulations of  such

   emissions which are promulgated under such subtitle  and shall, to

   the maximum extent practicable and consistent  with the provisions

   of  this section,  ensure that  the requirements  of such subtitle

   and this section are consistent.

   "(o) National Academy of Sciences Study.-

      "(1) Request of  the academy.-Within  3 months of  the date  of

   enactment  of   the  Clean   Air  Act  Amendments   of  1990,  the

   Administrator shall enter into  appropriate arrangements with  the

   National Academy of Sciences to conduct a review of-

         "(A)  risk assessment methodology used  by the Environmental

      Protection Agency to determine the carcinogenic risk associated

      with   exposure  to   hazardous  air  pollutants   from  source

      categories and  subcategories subject  to the  requirements  of

      this section; and

         "(B) improvements in such methodology.

      "(2)  Elements to  be studied.-In  conducting such  review, the

   National Academy of Sciences should  consider, but not be  limited

   to, the following-

         "(A) the  techniques used for  estimating and describing the

      carcinogenic potency to humans of hazardous air pollutants; and

         "(B)  the  techniques   used  for  estimating  exposure   to

      hazardous air pollutants (for hypothetical and actual maximally

      exposed individuals as well as other exposed individuals).

      "(3)   Other  health   effects   of  concern.-To   the   extent

   practicable,  the  Academy  shall  evaluate  and   report  on  the

   methodology  for  assessing  the  risk  of  adverse  human  health

   effects other  than cancer for  which safe thresholds of  exposure

   may not exist, including, but not limited to,  inheritable genetic

   mutations, birth defects, and reproductive dysfunctions.

      "(4)  Report.-A report on the  results of such  review shall be

   submitted  to  the  Senate Committee  on  Environment  and  Public

   Works,  the House  Committee  on  Energy and  Commerce,  the  Risk

   Assessment  and Management Commission  established by  section 303

   of the Clean Air Act  Amendments of 1990 and the Administrator not

   later than 30 months after the date of enactment  of the Clean Air

   Act Amendments of 1990.

      "(5) Assistance.-The Administrator shall  assist the Academy in

   gathering any  information the  Academy deems  necessary to  carry

   out  this subsection.   The  Administrator  may use  any authority

   under  this Act  to  obtain information  from  any person,  and to

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