PLACER COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 405 - SEPARATION OF EMISSIONS
(Adopted 11/12/74; Revised 05/24/77)

          If  air  contaminants  from a single source operation are emitted

          through two or more emission  points,  the total emitted quantity

          of  air contaminants cannot exceed the quantity  which  would  be

          allowable through a single emission point.



          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

          through  all  emission  points, unless the person responsible for

          the source operation, establishes  to  the  Air Pollution Control

          Officer's satisfaction, the correct total emitted quantity.