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hydrochlorofluorocarbon-225  (HCFC-225)    hydrochlorofluorocarbon-226

(HCFC-226)                hydrochlorofluorocarbon-231       (HCFC-231)

hydrochlorofluorocarbon-232  (HCFC-232)    hydrochlorofluorocarbon-233

(HCFC-233)               hydrochlorofluorocarbon-234        (HCFC-234)

hydrochlorofluorocarbon-235  (HCFC-235)    hydrochlorofluorocarbon-241

(HCFC-241)               hydrochlorofluorocarbon-242        (HCFC-242)

hydrochlorofluorocarbon-243  (HCFC-243)    hydrochlorofluorocarbon-244

(HCFC-244)                hydrochlorofluorocarbon-251       (HCFC-251)

hydrochlorofluorocarbon-252  (HCFC-252)    hydrochlorofluorocarbon-253

(HCFC-253)               hydrochlorofluorocarbon-261        (HCFC-261)

hydrochlorofluorocarbon-262  (HCFC-262)    hydrochlorofluorocarbon-271


The  initial list under this subsection shall also include the isomers

of  the  substances listed  above.  Pursuant  to subsection  (c),  the

Administrator shall add to  the list of class II  substances any other

substance that the Administrator  finds is known or may  reasonably be

anticipated  to   cause  or  contribute  to  harmful  effects  on  the

stratospheric ozone layer.

   "(c)  Additions to  the Lists.-(1)  The Administrator may  add, by

rule, in accordance  with the criteria set forth  in subsection (a) or

(b), as the case may be, any substance to the list of class I or class

II substances under subsection  (a) or (b). For purposes  of exchanges

under section 507, whenever a substance  is added to the list of class

I  substances the Administrator  shall, to the  extent consistent with

the  Montreal Protocol, assign such substance to existing Group I, II,

III, IV, or V or place such substance in a new Group.

   "(2)  Periodically, but  not less  frequently than  every 3  years

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

Administrator shall list, by  rule, as additional class I or  class II

substances  those substances  which the  Administrator finds  meet the

criteria of subsection (a) or (b), as the case may be.

   "(3)  At any  time, any person  may petition  the Administrator to

add a  substance  to the  list  of class  I  or class  II  substances.

Pursuant to the  criteria set forth  in subsection (a)  or (b) as  the

case  may be, within  180 days  after receiving  such a  petition, the


shall  either propose to add the substance  to such list or publish an

explanation  of   the  petition  denial.   In  any   case  where   the

Administrator  proposes  to   add  a  substance  to  such   list,  the

Administrator shall add, by  rule, (or make a final  determination not

to add) such substance to such list within 1 year after receiving such

petition. Any petition under this paragraph shall include a showing by

the  petitioner that  there  are data  on  the substance  adequate  to

support the petition. If the Administrator determines that information

on the substance is  not sufficient to make a determination under this

paragraph, the Administrator shall use any  authority available to the

Administrator,  under any  law administered  by the  Administrator, to

acquire such information.

   "(4) Only  a class  II substance  which is  added to  the list  of

class  I  substances  may  be  removed  from  the  list  of  class  II

substances.  No substance  referred  to in  subsection (a),  including

methyl chloroform, may be removed from the list of class I substances.

   "(d) New Listed  Substances.-In the case of any substance added to

the list  of class I or  class II substances after  publication of the

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