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Pacific Gas and Electric Company <br /> 202/799-5043 <br /> July 29 , 1988 <br /> Soil sample SB-1B was analyzed for a wide variety of <br /> compounds using various analytical methods . The purpose of the <br /> analyses was to insure that no compounds were present :in the <br /> subsurface soils at the station that are not readily biodegra- <br /> dable using in situ bioremediation. <br /> Two different analytical methods were used to detect TPH <br /> concentrations in soils . Analysis for TPH by EPA Method 8015 <br /> detects miscellaneous hydrocarbons in the C4 to C12 range ( the <br /> low boiling point volatile constituents) . Analysis for TPH by <br /> EPA Method 418 . 1 detects miscellaneous hydrocarbons above C10 <br /> range ( the high boiling point , non-volatile constituents) . <br /> Figure 3 , Analytical Methods and Hydrocarbon Range Detections, <br /> Ngraphically depicts the various ranges of hydrocarbons that are <br /> detected by the different analytical methods . <br /> SITE CONDITIONS <br /> GEOLOGY <br /> The station is situated in the southern portion of the <br /> Sacramento-San Joaquin River Delta system at an elevation of 15 <br /> feet above mean sea level . Nearby surface water include the <br /> Middle River , located approximately 1000 feet to the west and the <br /> Old River , located approximately 1 mile to the south. Depth to <br /> first groundwater at the site was encountered at about 12 feet <br /> below grade. <br /> Geologically, the site is underlain by low lying, heterogen- <br /> eous fluvial deposits, consisting of fine to medium sands , silts <br /> and clays . Samples from the soil borings drilled at the site <br /> 7 <br />