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i <br /> A <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> MONITORING AND REPORTING PROGRAM NO. <br /> NPDES NO. <br /> FOR <br /> ARCO PRODUCTS COMPANY <br /> ARCO STATION 434 <br /> GROUND WATER TREATMENT SYSTEM DISCHARGE <br /> SAN JOAQUIN COUNTY <br /> Specific sample station locations shall be established: under -direction—of the <br /> Board's staff,—and d_discription of'the stations shall be attached to this Order. <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 repre- <br /> sentative of the volume and quality of the discharge. Time of collection of <br /> samples shall be recorded. Effluent monitoring shall include the following: <br /> Sampling <br /> Constituents Units Type of Sample Frequency <br /> Electrical Conductivity umhos/cm Grab Quarterly <br /> @25C <br /> pH Number Grab Quarterly <br /> Flow gpd Cumulative Continuous <br /> Total Petroleum <br /> Hydrocarbons mg/l Grab Quarterly* <br /> (EPA Method 8015) <br /> Benzene ug/l Grab Quarterly* <br /> Ethylbenzene ug/l Grab Quarterly* <br /> Toluene ug/l Grab Quarterly* <br /> Xylene ug/l Grab Quarterly* <br /> Lead (Total ) ug/l Grab Quarterly* <br /> *Analyses shall be conducted weekly for four consecutive weeks following <br /> initial discharge to the storm drain from the treatment system. The weekly <br /> data shall be submitted to the Board within 30 days of sample collection. <br />