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.