Sec. 301.  (a)(1) The Administrator is  authorized to prescribe
such  regulations as  are  necessary to  carry out  his functions
under  this Act. The Administrator may delegate to any officer or
employee  of  the Environmental  Protection  Agency  such of  his
powers  and  duties   under  this  Act,  except   the  making  of
regulations subject to section 307(d),  as he may deem  necessary
or expedient.
  (2) Not later than one year after the date of enactment of this
paragraph,   the   Administrator  shall   promulgate  regulations
establishing  general  applicable  procedures  and  policies  for
regional officers and employees  (including the Regional Adminis-
trator)  to follow in  carrying out a  delegation under paragraph
(1), if any. Such regulations shall be designed- 
       (A)  to assure  fairness and  uniformity in  the criteria,
     procedures, and  policies applied by the  various regions in
     implementing and enforcing the Act;
       (B) to assure at  least an adequate quality audit  of each
     State's  performance and  adherence  to the  requirements of
     this Act in implementing and enforcing the Act, particularly
     in the review of new sources  and in enforcement of the Act;
     and
       (C) to provide a mechanism for identifying and standardiz-
     ing   inconsistent  or  varying  criteria,  procedures,  and
     policies being  employed by  such officers and  employees in
     implementing and enforcing the Act.
  (b)  Upon the  request  of  an  air pollution  control  agency,
personnel of the Environmental  Protection Agency may be detailed
to such agency for the purpose of carrying out the provisions  of
this Act.
  (c) Payments under grants  made under this Act  may be made  in
installments, and in advance  or by way of reimbursement,  as may
be determined by the Administrator.
  (d)  Tribal  Authority.-  (1)  Subject  to  the  provisions  of
paragraph (2), the Administrator- 
       (A) is  authorized to treat Indian tribes  as States under
     this Act,  except for purposes of the requirement that makes
     available  for  application  by  each  State  no  less  than
     one-half of 1 percent of annual appropriations under section
     105; and
       (B) may provide  any such Indian tribe grant  and contract
     assistance to carry out functions provided by this Act.
  (2) The Administrator  shall promulgate  regulations within  18
months after  the  date of  the enactment  of the  Clean Air  Act
Amendments of  1990, specifying those provisions of  this Act for
which  it is appropriate to  treat Indian tribes  as States. Such
treatment shall be authorized only if- 
       (A) the Indian  tribe has  a governing  body carrying  out
     substantial governmental duties and powers;
       (B)  the functions  to be  exercised  by the  Indian tribe
     pertain to  the management  and protection of  air resources
     within the  exterior boundaries of the  reservation or other
     areas within the tribe's jurisdiction; and
       (C) the Indian tribe is reasonably expected to be capable,
     in the  judgment of the  Administrator, of carrying  out the
     functions to  be exercised in  a manner consistent  with the
     terms and purposes  of this Act  and all applicable  regula-
     tions.
  (3)   The  Administrator   may  promulgate   regulations  which
establish  the  elements  of   tribal  implementation  plans  and
procedures for  approval or disapproval  of tribal implementation
plans and portions thereof.
  (4)  In any case in which the Administrator determines that the
treatment   of  Indian   tribes   as  identical   to  States   is
inappropriate or administratively  infeasible, the  Administrator
may   provide,  by   regulation,   other  means   by  which   the
Administrator will  directly administer such provisions  so as to
achieve the appropriate purpose.
  (5)   Until  such   time  as   the  Administrator   promulgates
regulations  pursuant to  this subsection, the  Administrator may
continue  to  provide  financial  assistance to  eligible  Indian
tribes under section 105.
[42 U.S.C. 7601]