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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL. VALLEY REGION <br /> MONITORING AND REPORTING PROGRAM NO. <br /> NPDES NO. CA0082881 <br /> FOR <br /> EXXON COMPANY U.S.A. <br /> FORMER EXXON RETAIL SITE 7-3942 <br /> GROUND WATER TREATMENT SYSTEM DISCHARGE <br /> SAN JOAQUIN COUNTY <br /> INFLUENT MONITORING <br /> Influent samples shall be collected after the last connection before the wastes <br /> enter the treatment process. Influent samples shall 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 /> Sampling <br /> Constituents Units Type of Sample Frequency <br /> Total Petroleum mg/l Grab Monthly <br /> Hydrocarbons <br /> Benzene Ng/l Grab Monthly <br /> Ethylbenzene Ng/l Grab Monthly <br /> Toluene pg/l Grab Monthly <br /> Xylene pg/l Grab Monthly <br /> Lead (Total )' M/l Grab Monthly <br /> EFFLUENT MONITORING <br /> Effluent samples shall be collected at the discharge from the final holding tank <br /> prior to being either reinjected or discharged into the storm drain. Effluent <br /> samples shall be representative of the volume and quality of the discharge. Time <br /> of collection of samples shall be recorded. Effluent monitoring shall include <br /> the following: <br /> Sampling <br /> Constituents Units Type of Sample Frequency <br /> Specific Conductivity Nmhos/cm Grab Monthly <br /> pH Number Grab Monthly <br /> Flow gpd Cumulative Continuous <br /> Total Petroleum <br /> Hydrocarbons mg/l Grab Monthly <br /> Benzene M/l Grab Monthly** <br /> Ethylbenzene Ng/l Grab Monthly** <br /> Toluene M/l Grab Mothlyly'* <br />