NCUAQMD RULE 3-3-500 TESTING METHOD
LAST REVISED 11/11/11

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.