AMAAPCD RULE 421 CONTRIB. TO VIOL. OF NAT. AMB. AQ STANDARD
LAST REVISED 11/11/11

Rule 421  Contribution to Violation of National Ambient Air
          Quality Standard.  The Air Pollution Control Officer
          shall deny an Authority to Construct for a new facility
          or modification for which an analysis was required and
          performed in accordance with the provisions of Rule 419
          and which would contribute to concentrations which
          exceed a national ambient air quality standard as of
          the new or modified facility's startup date unless the
          following conditions are met:

     A.   Each new source or modification within the facility
          shall meet an emission limitation which is equivalent
          to the lowest achievable emission rate for such source
          and such nonattainment pollutant or precursor.

     B.   The applicant shall certify that all existing major
          facilities owned or operated by the applicant in the
          State of California are in compliance, or are on
          approved schedules of compliance with all applicable
          emission limitations or standards which are part of the
          State Implementation Plan approved by the Environmental
          Protection Agency.

     C.   Emission reductions (offsets) from existing facilities
          in the area of the new facility or modification shall
          be secured pursuant to the provisions of Rule 411.  The
          emission reductions shall be sufficient to provide a
          net positive air quality benefit consistent with the
          provisions of the approved Nonattainment Plan.