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   of  the  source  elects  to  offset  the  increase  by  a  greater

   reduction in emissions  of the air pollutant concerned  from other

   discrete operations, units, or activities within the source at  an

   internal  offset  ratio  of  at   least  1.3  to  1.   The  offset

   requirements  of this  part shall  not  be  applicable in  Extreme

   Areas  to   a  modification   of  an  existing   source  if   such

   modification consists of installa-

   tion  of  equipment   required  to  comply  with   the  applicable

   implementation plan, permit, or this Act.

      "(3)  Use of  clean fuels  or advanced  control technology.-For

   Extreme Areas, a plan revision  shall be submitted within  3 years

   after  the date of  the enactment of the  Clean Air Act Amendments

   of 1990  to require, effective 8 years  after such date, that each

   new, modified,  and existing electric  utility and industrial  and

   commercial boiler  which  emits more  than  25  tons per  year  of

   oxides of nitrogen-

         "(A) burn  as its  primary fuel  natural  gas, methanol,  or

      ethanol (or a comparably low polluting fuel), or

         "(B) use  advanced  control  technology (such  as  catalytic

      control   technology  or  other  comparably  effective  control

      methods) for reduction of emissions of oxides of nitrogen.

   For purposes  of this  subsection, the  term `primary fuel'  means

   the fuel which  is used 90 percent or  more of the operating time.

   This  paragraph shall  not apply  during  any  natural gas  supply

   emergency (as defined in  title III of the Natural  Gas Policy Act

   of 1978).

      "(4)  Traffic control measures  during heavy traffic hours.-For

   Extreme  Areas,  each  implementation  plan  revision  under  this

   subsection  may contain  provisions  establishing  traffic control

   measures applicable during  heavy traffic hours to reduce  the use

   of    high    polluting    vehicles   or    heavy-duty   vehicles,

   notwithstanding any other provision of law.

      "(5)  New technologies.-The  Administrator  may, in  accordance

   with section  110, approve  provisions of  an implementation  plan

   for  an Extreme  Area which anticipate  development of new control

   techniques or improvement  of existing  control technologies,  and

   an  attainment demonstration  based  on  such provisions,  if  the

   State demonstrates to the satisfaction of  the Administrator that-

         "(A)  such  provisions  are  not  necessary  to  achieve the

      incremental  emission reductions required  during the  first 10

      years  after the  date of  the enactment of  the Clean  Air Act

      Amendments of 1990; and

         "(B)  the  State has  submitted  enforceable  commitments to

      develop and adopt contingency measures to be implemented as set

      forth  herein if  the anticipated  technologies do  not achieve

      planned reductions.

   Such contingency measures shall be submitted  to the Administrator

   no later than 3 years  before proposed implementation of  the plan

   provisions and  approved or  disapproved by  the Administrator  in

   accordance with  section 110.  The contingency  measures shall  be

   adequate   to   produce   emission   reductions   sufficient,   in

   conjunction with  other approved plan  provisions, to achieve  the

   periodic  emission  reductions required  by  subsection  (b)(1) or

   (c)(2)   and  attainment   by  the   applicable   dates.  If   the

   Administrator  determines  that  an Extreme  Area  has  failed  to

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