SISAPCD RULE 4.9 SEPARATION OF EMISSIONS          
LAST REVISED 01/01/89          
          
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          RULE 4.9  Separation of Emissions
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          If  air  contaminants  from a single source operation are emitted
          through two or more emission  points,  the total emitted quantity
          of any air contaminant limited in this regulation  cannot  exceed
          the  quantity  which  would  be  the allowable emission through a
          single emission point; and the total emitted quantity of any such
          air contaminant shall be taken as  the  product  of  the  highest
          concentration  measured  in  any  of  the emission points and the
          combined exhaust gas volume from all emission  points, unless the
          person  responsible  for  the  source  operation establishes  the
          correct total emitted quantity.

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