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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> h4ONITORING 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 /> i <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 a <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 Erg/1 Grab Monthly <br /> Ethylbenzene lig/l Grab Monthly <br /> Toluene lrg/l Grab Monthly <br /> Xylene Erg/1 Grab Monthly <br /> Lead (Total )` Erg/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 Ermhos/cm Grab Monthly <br /> pH Number Grab Monthly' <br /> Flow gpd Cumulative Continuous. <br /> .Total 'Petroleum - <br /> Hydrocarbons —mg/l, - Grab Monthly:` <br /> Benzene arg/1 Grab Monthly" p <br /> Ethyl benzene pg/T. Grab Monthly' <br /> Tol uenen ECJ/l Grab Mothlyly <br /> -4 x .W _ • •- s[' _ -J h 9b^' .'it. <br />