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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/1 Grab Monthly <br />Benzene Ail Grab Monthly <br />Ethylbenzene 4/1 Grab Monthly <br />Toluene 4/1 Grab Monthly <br />Xylene gg/1 Grab Monthly <br />Lead (total)* Pg/1 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 Alhos/cm Grab Monthly <br />pH pH units Grab Monthly <br />Flow gpd Cumulative Monthly <br />Total Petroleum Hydrocarbons mg/1 Grab Monthly** <br />Benzene gg/1 Grab Monthly** <br />Ethylbenzene gg/1 Grab Monthly** <br />Toluene 4/1 Grab Monthly** <br />Xylene 4/1 Grab Monthly** <br />Lead (total)* ii9/1 Grab Monthly** <br />Bioassay*** % Survival Grab Monthly <br />If lead is in ground water. <br />I) Analyses shall be conducted weekly for four consecutive weeks following <br />initial discharoe from the treatment system. 2) If any sample shows <br />**