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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> MONITORING AND REPORTING PROGRAM <br /> ATTACHMENT B TO GENERAL ORDER NO. 92-150 <br /> FOR DISCHARGE OF <br /> GROUND WATER FROM CLEANUP OF <br /> PETROLEUM FUEL POLLUTION <br /> TO SURFACE WATERS <br /> INFLUENT MONITORING <br /> Influent samples shall be collected after the last connection before the wastes <br /> enter the treatment process. Influent samples should be representative of the <br /> volume and nature of the influent. Time of collection of a grab sample shall be <br /> recorded. The following shall constitute the influent monitoring program: <br /> Type of Sampling <br /> Constituents Units Sample Frequency <br /> Total Petroleum Hydrocarbons mg/l Grab Monthly <br /> Benzene µg/l Grab Monthly <br /> Ethylbenzene µg/l Grab Monthly <br /> Toluene µg/l Grab Monthly <br /> Xylene µg/1 Grab Monthly <br /> Lead (total )* µg/l Grab Monthly <br /> EFFLUENT MONITORING <br /> Effluent samples shall be collected downstream from the last connection through <br /> which wastes can be admitted into the outfall . Effluent samples should be <br /> representative of the volume and nature of the discharge. Time of collection of <br /> a grab sample shall be recorded. The following shall constitute the effluent <br /> monitoring program: <br /> Type of Sampling <br /> Constituents Units Sample Frequency <br /> Specific Conductivity kanhos/cm Grab Monthly <br /> pH pH units Grab Monthly <br /> Flow gpd Cumulative Monthly <br /> Total Petroleum Hydrocarbons mg/l Grab Monthly** <br /> Benzene µg/l Grab Monthly** <br /> Ethylbenzene µg/l Grab Monthly** <br /> Toluene ug/1 Grab Monthly** <br /> Xylene µg/l Grab Monthly** <br /> Lead (total)* ug/l Grab Monthly** <br /> Bioassay*** % Survival Grab Monthly <br /> * If lead is in ground water. <br /> ** 1) Analyses shall be conducted weekly for four consecutive weeks following <br /> initial discharge from the treatment system. 2) If any sample shows <br />