AMAAPCD RULE 419 NONATTAINMENT POLLUTANT AQ ANALYSIS
LAST REVISED 11/11/11

Rule 419  Nonattainment Pollutant Air Quality Analysis.

     A.   Utilizing the air quality simulation model designated
          pursuant to Rule 407, the Air Pollution Control Officer
          shall determine the increases in ambient nonattainment
          pollutant concentrations in downwind District zones and
          other Air Pollution Control Districts that will occur
          as a result of operation of the proposed facility or
          modification.  Also, the Air Pollution Control Officer
          may require that the cost of modeling be borne by the
          applicant.  The model shall consider air quality
          impacts projected for the area form source emissions
          and secondary emissions.

     B.   Where a facility or modification is constructed in
          phases which individually do not emit more than 100
          tons per year of a nonattainment pollutant or
          precursor, the allowable emissions from all such phases
          granted an Authority to Construct after December 21,
          1976, shall be added together and this Rule shall be
          applicable when a proposed phase would cause the sum of
          the allowable emissions to exceed 100 tons per year of
          such nonattainment pollutant or precursor.

     C.   For sources of nitrogen oxides, the initial
          determination of whether such facility or modification
          would cause or contribute to a violation of the
          national ambient air quality standard for nitrogen
          dioxide shall be made using the model designated
          pursuant to the provisions of Rule 407 and assuming
          that all nitric oxide emitted is oxidized to nitrogen
          dioxide by the time the plume reaches ground level. 
          The initial concentration estimates may be adjusted by
          the Air Pollution Control Officer if adequate data are
          available to account for the expected oxidation rate.

     D.   The determination as to whether a facility would cause
          or contribute to a violation of the national ambient
          air quality standards shall be made as of the new or
          modified facility's startup date.