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   aquatic and terrestrial  resources in the United States and Canada

   which may be affected by the deposition of acidic compounds;

      (2)  description  of  the  nature  and  numerical  value  of  a

   deposition  standard or  standards  that  would be  sufficient  to

   protect such resources;

      (3) description of  the use  of such standard  or standards  in

   other Nations or by  any of the several States  in acid deposition

   control programs;

      (4) description of the  measures that would need to be taken to

   integrate  such standard  or standards  with  the control  program

   required by title IV of the Clean Air Act;

      (5)  description of  the  state of  knowledge  with respect  to

   source-receptor  relationships  necessary  to  develop  a  control

   program on  such standard or standards and the additional research

   that  is on-going  or  would  be needed  to  make such  a  control

   program feasible; and

      (6) description  of the  impediments to implementation  of such

   control   program  and   the  cost-effectiveness   of   deposition

   standards compared to  other control strategies including  ambient

   air quality  standards, new source  performance standards and  the

   requirements of title IV of the Clean Air Act.

SEC. 405. NATIONAL ACID LAKES REGISTRY.

   The Administrator  of  the Environmental  Protection Agency  shall

create a National Acid  Lakes Registry that shall list,  to the extent

practical,  all lakes  that are  known  to be  acidified  due to  acid

deposition,  and  shall  publish such  list  within  one  year of  the

enactment of  this Act. Lakes shall  be added to the  registry as they

become acidic  or as data  becomes available to show  they are acidic.

Lakes shall be deleted from the registry as they become nonacidic.

SEC. 406. INDUSTRIAL SO2 EMISSIONS

   (a)  Report.-Not later  than  January 1,  1995  and every  5 years

thereafter, the  Administrator of the  Environmental Protection Agency

shall transmit to  the Congress  a report containing  an inventory  of

national annual  sulfur dioxide emissions from  industrial sources (as

defined  in title IV of  the Act), including  units subject to section

405(g)(6)  of the  Clean Air  Act, for  all years  for which  data are

available, as  well as  the likely  trend in  such emissions  over the

following twenty-year period. The reports shall also contain estimates

of  the  actual  emission  reduction   in  each  year  resulting  from

promulgation  of the  diesel  fuel  desulfurization regulations  under

section 214.

   (b) 5.60 Million Ton Cap.-Whenever the inventory required  by this

section  indicates  that  sulfur  dioxide  emissions  from  industrial

sources, including units subject to section 405(g)(5) of the Clean Air

Act,  may reasonably  be expected  to reach  levels greater  than 5.60

million  tons  per  year,   the  Administrator  of  the  Environmental

Protection  Agency shall take such actions  under the Clean Air Act as

may be appropriate to  ensure that such  emissions do not exceed  5.60

million  tons per year. Such  actions may include  the promulgation of

new and  revised standards of  performance for new  sources, including

units subject to section 405(g)(5) of the Clean Air Act, under section

111(b) of the  Clean Air Act, as well as  promulgation of standards of

performance for  existing sources, including units  subject to section

405(g)(5) of the Clean  Air Act, under authority of  this section. For

an  existing  source  regulated   under  this  section,  "standard  of

performance" means  a standard  which the Administrator  determines is

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