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      shall promulgate emission  limitations for coke  oven emissions

      from coke oven batteries. Notwithstanding paragraph (3) of this

      subsection, the compliance date  for such emission  limitations

      for existing coke oven batteries shall be January 1, 1998. Such

      emission  limitations  shall  reflect  the   lowest  achievable

      emission rate as defined in section 171 for a coke oven battery

      that is  rebuilt or a replacement  at a coke oven  plant for an

      existing battery.  Such emission  limitations shall be  no less

      stringent than-

           "(I)  3 per  centum  leaking doors  (5 per  centum leaking

         doors for six meter batteries);

           "(II) 1 per centum leaking lids;

           "(III) 4 per centum leaking offtakes; and

           "(IV) 16  seconds visible  emissions per charge,   with an

         exclusion for emissions  during the period after the closing

         of self-sealing oven doors (or the total mass emis-

         sions equivalent).  The rulemaking  in which  such  emission

         limitations   are  promulgated   shall  also   establish  an

         appropriate   measurement    methodology   for   determining

         compliance  with   such  emission  limitations,  and   shall

         establish  such   emission  limitations   in  terms  of   an

         equivalent  level of  mass emissions  reduction from  a coke

         oven  battery, unless  the Administrator  finds that  such a

         mass   emissions  standard  would  not   be  practicable  or

         enforceable. Such measurement  methodology, to the extent it

         measures   leaking  doors,  shall  take  into  consideration

         alternative test methods  that reflect  the best  technology

         and practices actually  applied in the affected  industries,

         and shall  assure that the final test methods are consistent

         with the performance of such best technology and practices.

           "(ii)  If  the  Administrator  fails  to  promulgate  such

         emission limitations  under this  subparagraph prior  to the

         effective  date of  such emission limitations,  the emission

         limitations applicable  to coke  oven  batteries under  this

         subparagraph shall be-

              "(I)  3 per centum leaking doors  (5 per centum leaking

           doors for six meter batteries);

              "(II) 1 per centum leaking lids;

              "(III) 4 per centum leaking offtakes; and

              "(IV) 16 seconds visible emissions per  charge,  or the

           total  mass  emissions  equivalent  (if  the   total  mass

           emissions equivalent is determined  to be practicable  and

           enforceable),  with no exclusion  for emissions during the

           period after the closing of self-sealing oven doors.

         "(C) Not later than January 1, 2007, the Administrator shall

      review the emission limitations promulgated  under subparagraph

      (B)  and revise,  as  necessary, such  emission limitations  to

      reflect  the  lowest achievable  emission  rate  as defined  in

      section 171 at the time for a coke oven battery that is rebuilt

      or a replacement at a coke oven plant for an  existing battery.

      Such emission limitations shall  be no less stringent than  the

      emission   limitation   promulgated  under   subparagraph  (B).

      Notwithstanding   paragraph   (2)  of   this   subsection,  the

      compliance date for such emission limitations for existing coke

      oven batteries shall be January 1, 2010.

         "(D) At  any time  prior to January  1, 1998,  the owner  or

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