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samples were obtained from the borings and analyzed for TPH using EPA Method 8015M and one sample was analyzed for BTEX using EPA Method 8020 Petroleum hydrocarbons were detected in only one of the four samples collected (B-11) at a concentration of 4,300 ppm A benzene concentration of 0.42 ppm was also detected in the sample obtained from B-13 TABLE 2-4 summarizes the sample depths and analytical results for each of the soil samples ERM-West concluded that the deepest occurrence of petroleum hydrocarbon impacted soil was between 35 and 40 feet bgs In December, 1992, McLaren/Hart conducted an investigation to determine the type and relative age of hydrocarbon constituents present in site soil Two soil borings (SB-1A and SB-2) were drilled to depths ranging from 18 to 46 5 feet bgs (refer to Appendix A for boring logs) Boring SB1-A was drilled near boring B-6 in an area where high concentrations of TPH had previously been detected, and boring SB-2 was drilled in a clean area, near boring B-1 (refer to FIGURE 2-2) A soil sample was obtained from boring SB- 1A at a depth of 16 5 feet and, using EPA Methods 418 1 and 8015M, was analyzed for TPH,, fuel type identification, and relative age In addition, a soil sample from boring SB-2 at a depth of 40 feet was collected and analyzed for geophysical properties TPHd was detected at a concentration of 1,000 ppm in boring SB-1A The results of the fingerprint characterization by capillary gas chromatography (GC) using flame ionization detection (FID) and electron capture detection (ECD) indicated the presence of medium to high boiling compounds, such as those found in degraded diesel and motor oil or biological material In April, 1993, McLaren/Hart obtained two soil samples from boring HA-1 (adjacent to S13- 1A) at depths of 13-14 feet bgs to conduct partitioning studies The studies were performed to determine the petroleum hydrocarbon constituents which were present in the soil that may partition into percolating water. To maxinuze the potential migration of the hydrocarbons, the soil samples were mixed with distilled water, placed in sealed bottles with no headspace, and rotated on a rolling table for 48 hours at room temperature The samples were then filtered to collect the water The filtered water was extracted using methylene chloride to isolate the extractable organic material. In order to separate the aromatic hydrocarbons from the polar compounds, the sample was then separated using G W&WIMAWAM FNBI.W 26 93 2-9 IM