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      the blend.

      "(5) Areas  covered.-The  provisions of  this subsection  shall

   apply  only  to the  48  contiguous  States  and  the District  of

   Columbia.".

SEC. 217. DIESEL FUEL SULFUR CONTENT.

   Section 211 of  the Clean Air Act  (42 U.S.C. 7545) is  amended by

adding the following new subsection at the end thereof:

   "(i) Sulfur  Content Requirements  for Diesel Fuel.-(1)  Effective

October  1, 1993, no person shall manufacture, sell, supply, offer for

sale or supply, dispense, transport, or introduce into com-

merce  motor  vehicle diesel  fuel which  contains a  concentration of

sulfur in excess of 0.05  percent (by weight) or which fails to meet a

cetane index minimum of 40.

   "(2) Not later  than 12 months after the  date of the enactment of

the  Clean  Air  Act  Amendments  of  1990,  the  Administrator  shall

promulgate regulations  to implement  and enforce the  requirements of

paragraph  (1).  The  Administrator   may  require  manufacturers  and

importers of diesel fuel not intended for use in motor vehicles to dye

such fuel in a particular  manner in order to segregate it  from motor

vehicle  diesel fuel.  The Administrator  may establish  an equivalent

alternative  aromatic  level  to  the cetane  index  specification  in

paragraph (1).

   "(3) The  sulfur  content of  fuel  required  to be  used  in  the

certification  of  1991  through  1993 model  year  heavy-duty  diesel

vehicles and engines  shall be  0.10 percent (by  weight). The  sulfur

content and  cetane index minimum of  fuel required to be  used in the

certification of  1994 and later model year heavy-duty diesel vehicles

and  engines  shall  comply  with the  regulations  promulgated  under

paragraph (2).

   "(4) The  States of  Alaska and Hawaii  may be  exempted from  the

requirements  of this  subsection in  the same  manner as  provided in

section 324. The Administrator shall take final action on any petition

filed under section  324 or this  paragraph for an exemption  from the

requirements of this subsection, within 12 months from the date of the

petition.".  

SEC. 218. LEAD SUBSTITUTE GASOLINE ADDITIVES.

   (a) Additives.-Section 211 of the  Clean Air Act (42  U.S.C. 7545)

is amended by adding the following at the end thereof:

   "(j) Lead  Substitute Gasoline  Additives.-(1) After  the date  of

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

proposing to register any gasoline additive under subsection (a) or to

use any previously registered  additive as a lead substitute  may also

elect  to register the additive as a lead substitute gasoline additive

for  reducing valve seat wear by providing the Administrator with such

relevant information regarding product identity and composition as the

Administrator deems necessary for carrying out the responsibilities of

paragraph (2) of  this subsection  (in addition  to other  information

which may be required under subsection (b)).

   "(2) In addition to the other testing which may be required  under

subsection  (b), in the case of the lead substitute gasoline additives

referred  to in  paragraph (1),  the Administrator  shall develop  and

publish a test procedure to determine the  additives' effectiveness in

reducing valve  seat wear  and  the additives'  tendencies to  produce

engine deposits  and other adverse  side effects. The  test procedures

shall be  developed in cooperation  with the Secretary  of Agriculture

and  with  the  input of  additive  manufacturers,  engine and  engine

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