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S ECOR ------ <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> March 27, 2007 <br /> Page 6 of 8 <br /> Soil and grab groundwater samples will be analyzed for the following constituents: <br /> ❑ Total petroleum hydrocarbons as diesel (TPHd) and motor oil (TPHmo) using <br /> U.S. Environmental Protection Agency (EPA) Method 8015B with silica gel <br /> preparation; and <br /> ❑ Total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX), and methyl tert-butyl ether (MTBE) by <br /> EPA Method 8260B. <br /> Soil Boring Abandonment <br /> Following sample collection, the soil borings will be backfilled in accordance with <br /> SJCEHD permit requirements. <br /> Waste Management <br /> Soil cuttings and decontamination fluids will be contained in 55-gallon steel drums, <br /> labeled, and stored on-site pending profiling and disposal. SECOR will sample the <br /> drums to assist PG&E in profiling the waste. <br /> Reporting <br /> SECOR will prepare a summary report describing the work performed and presenting <br /> findings, conclusions, and recommendations, as appropriate. The report will include <br /> tabulated soil and groundwater data, a scaled site plan illustrating soil boring locations, <br /> soil boring logs, and the geophysical investigation report. <br /> Optional Task 4— Installation of Groundwater Monitoring Wells and Related Tasks <br /> If SECOR observes obvious petroleum hydrocarbon impacts to groundwater (such as <br /> sheen or product on the groundwater) or conditions indicating a strong potential for <br /> impact (such as contaminated soils in contact with groundwater), SECOR proposes <br /> installing three 2-inch-diameter groundwater monitoring wells. One of the wells will be <br /> located in or near the suspected source area and the two additional wells will be located <br /> to provide data regarding the distribution of chemical concentrations in groundwater, as <br /> well as groundwater gradient and flow direction. Potential groundwater monitoring well <br /> locations are illustrated on Figure 3. <br /> I:\PG&E\French Camp\additional 2007 investigation\work plan\2007 Investigation Work Plan_Final.doc March 27,2007 <br /> Project No.050T.50351.01 <br />