NORTH COAST UNIFIED AIR QUALITY MANAGEMENT DISTRICT

SECTION 3

AIRBORNE TOXIC CONTROL MEASURE FOR HEXAVALENT CHROMIUM EMISSIONS FROM CHROMATE TREATED COOLING TOWERS

RULE 3-500 - TESTING METHOD

Hexavalent chromium concentrations in circulating cooling tower water shall be determined by use of American Public Health Association Method 312B, or an equivalent method approved by the District. This method is printed in Standard Methods for the Examination of Water and Wastewater, Sixteenth Edition, published by the American Public Health Association.