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j <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> REVISED MONITORING AND REPORTING PROGRAM NO. 96-807 <br /> PACIFIC GAS AND ELECTRIC COMPANY <br /> LATHROP GAS DEHYDRATOR STATION <br /> SAN JOAQUIN COUNTY <br /> Pacific Gas and Electric Company operates a gas dehydrator station near Lathrop. Hazardous materials <br /> have spilled at the site, and the soil and groundwater are contaminated with petroleum hydrocarbons and <br /> glycol compounds. The extent of contamination has been well defined. <br /> This monitoring and reporting program(MRP)is issued pursuant to Section 13267 of the California Water <br /> Code. Prior to construction of any new groundwater monitoring or extraction wells,the Discharger shall <br /> submit plans and specifications to the Board for review and approval. Once installed, all new wells shall <br /> be added to the MRP, and shall be sampled and analyzed according to the schedule below. <br /> GROUNDWATER MONITORING <br /> There are 10 shallow monitoring wells and one deep monitoring well at the site, as shown in Figure 1. <br /> The groundwater monitoring program for wells MW-01 through MW-11A, and any additional wells <br /> installed subsequent to adoption of this MRP, shall include the list below. Sample collection and analysis <br /> shall follow standard EPA protocol. Monitoring wells which contain free phase petroleum product or a <br /> visible sheen need only be monitored for depth to groundwater and thickness of free product. <br /> EPA Preparation and Maximum Detection Sampling <br /> Constituents Analytical Method Limit (µg/l)1 Frequency <br /> Depth to Groundwater - --- --- Semi-annual2 <br /> Free Phase Petroleum Thickness --- --- Semi-annual2 <br /> Benzene 5030/8020 0.5 Semi-annual2 <br /> Toluene 5030/8020 0.5 Semi-annual2 <br /> Ethylbenzene 5030/8020 0.5 Semi-annual2 <br /> Xylenes 5030/8020 2.0 Semi-annua12 <br /> TPH as Gasoline 5030/8015M 50 Semi-annual2 <br /> TPH as Diesel 3510/8015M 50 Semi-annual2 <br /> Glycol Compounds 8015 10,000 Semi-annual2 <br /> 1 For nondetectable results <br /> 2 During the first and third quarters <br /> Monitoring well MW-I IB shall also be monitored according to the list above,but on a quarterly basis. <br /> If no constituents have been detected after four quarters of monitoring,then upon approval of staff, the <br /> Discharger may monitor well MW-I IB on a semi-annual basis. <br />