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      "(9)  Contingency provisions.-In  addition  to the  contingency

   provisions required  under section  172(c)(9),  the plan  revision

   shall  provide for  the implementation of  specific measures to be

   undertaken  if the  area fails  to meet  any applicable milestone.

   Such  measures  shall  be   included  in  the  plan   revision  as

   contingency measures to take effect  without further action by the

   State or the  Administrator upon  a failure by  the State to  meet

   the applicable milestone.

      "(10)  General offset  requirement.-For purposes  of satisfying

   the emission offset  requirements of this part, the ratio of total

   emission reductions of volatile organic compounds to total

   increase  emissions of such air pollutant shall be at least 1.2 to


Any reference  to  `attainment  date'  in  subsection  (b),  which  is

incorporated by  reference into  this subsection,  shall refer to  the

attainment date for serious areas.

   "(d) Severe Areas.-Each  State in  which all or  part of a  Severe

Area  is located  shall, with  respect  to the  Severe Area,  make the

submissions  described  under  subsection  (c)  (relating  to  Serious

Areas),  and  shall  also  submit  the  revisions  to  the  applicable

implementation plan  (including the  plan items) described  under this

subsection. For any Severe  Area, the terms `major source'  and `major

stationary  source' include (in  addition to the  sources described in

section  302) any stationary source or group of sources located within

a  contiguous area  and under  common control  that emits, or  has the

potential  to emit,  at least  25 tons  per year  of volatile  organic


      "(1) Vehicle  miles traveled.-(A) Within 2 years after the date

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

   shall  submit  a  revision that  identifies  and  adopts  specific

   enforceable  transportation control  strategies and transportation

   control measures to  offset any growth in emissions from growth in

   vehicle miles  traveled or numbers of  vehicle trips  in such area

   and to attain  reduction in motor vehicle emissions  as necessary,

   in combination with other emission reduction  requirements of this

   subpart, to comply  with the requirements of  subsection (b)(2)(B)

   and  (c)(2)(B)   (pertaining  to   periodic  emissions   reduction

   requirements).  The  State  shall consider  measures  specified in

   section 108(f), and choose from among and implement  such measures

   as necessary to  demonstrate attainment with the  national ambient

   air quality  standards; in  considering such  measures, the  State

   should ensure adequate  access to downtown, other  commercial, and

   residential  areas and  should  avoid  measures that  increase  or

   relocate emissions and congestion rather than reduce them.

      "(B) Within  2 years after the  date of enactment of  the Clean

   Air Act  Amendments of  1990, the  State shall  submit a  revision

   requiring employers in  such area to implement programs  to reduce

   work-related vehicle trips  and miles traveled by  employees. Such

   revision  shall be developed in accordance with guidance issued by

   the Administrator  pursuant to  section  108(f)  and shall,  at  a

   minimum, require  that each  employer of  100 or  more persons  in

   such  area increase  average passenger  occupancy  per vehicle  in

   commuting trips between home and the workplace during peak  travel

   periods by  not less  than 25  percent above  the average  vehicle

   occupancy for all such trips in the area at  the time the revision

   is  submitted.  The  guidance of  the  Administrator  may  specify

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