AMAAPCD RULE 217 EXISTING SOURCES
LAST REVISED 11/11/11

Rule 217  Existing Sources.  In any case where Regulation II
          imposes standards different than the standards
          applicable to an existing source of emission (on day of
          adoption of new Regulation 1974), and the source of
          emissions was in compliance, under variance, or
          authority to construct, with the less restrictive
          standards applicable on such date, then the source
          shall remain in compliance with such Rule, until
          modified or until July 1, 1984, whichever occurs first. 
          In no event is any modification to cause an increase in
          emissions over that being permitted prior to such
          modification.