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i <br /> Soil Sampling November 26, 1990 <br /> ARCO Station No. 2076, Lodi, California AGS 30008-2 <br /> During sampling, the geologist will use a PID to characterize the relative levels of <br /> hydrocarbons in the soil and note any subjective evidence of hydrocarbons such as obvious <br /> product odor and discoloration. Field instruments such as the PID are useful for indicating <br /> relative levels of hydrocarbon vapors, but do not detect the concentration of hydrocarbons <br /> present with the same precision as laboratory analyses. <br /> During sampling, the soil will be brought to the ground surface in an excavator bucket, and <br /> the outer soil will be scraped away. A clean, 6-inch-long, 2 1/2 inch-diameter, clean brass <br /> tube will be driven into the soil using a percussion sampler. The brass tube will be removed <br /> and the ends covered with aluminum foil and plastic end caps and taped. The tube will be <br /> labeled and immediately placed on ice for transport to the laboratory. Chain of Custody <br /> Records will be maintained throughout delivery to the laboratory. <br /> Soil samples will also be collected from the stockpiled soil to evaluate treatment and <br /> disposal options. Four soil samples will be collected for every 50 cubic yards of stockpiled <br /> soil. Each group of four samples will be composited into one sample by the laboratory. Soil <br /> samples will be collected in clean brass tubes from approximately 18 inches below the <br /> surface of the stockpiles. <br /> Soil samples collected will be submitted to Applied Analytical Environmental Laboratories <br /> in Sacramento, California (Hazardous Waste Testing Laboratory Certificate No. E773) or <br /> other State-certified laboratory, for analysis of TPHg by Environmental Protection Agency <br /> (EPA) preparation Method 5030 and modified EPA Method 8015; and BTEX by EPA <br /> preparation Method 5030 and EPA Method 8020. Soil samples collected under former <br /> leaded gasoline tanks will be submitted and analyzed for organic lead using methods <br /> approved by the California Department of Health Services. The phone number of the lab <br /> is 916-452-2901. Laboratory results will be discussed with ARCO personnel and with <br /> ARCO's approval forwarded to the SJPHS. The new tanks will be installed after the SJPHS <br /> 2 <br /> App/ped Geosystems <br />