SEC. 506. OTHER AUTHORITIES.
  (a) In General.-  Nothing in this title  shall prevent a State,
or  interstate permitting authority, from establishing additional
permitting requirements not inconsistent with this Act.
  (b) Permits Implementing Acid Rain Provisions.-  The provisions
of  this  title,  including provisions  regarding  schedules  for
submission  and approval  or disapproval of  permit applications,
shall  apply to permits implementing the requirements of title IV
except as modified by that title.
[42 U.S.C. 7661e]