SITE INFORMATION AND CORRESPONDENCE

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LEVI N E-FRICKE samples grabbed from both boreholes were analyzed for TPH using EPA Method 8015 and for VOCs using EPA Method 624. The ground-water sample collected from boring B-14 was also tested for chlorinated herbicides using EPA Method 615. The results of these analyses indicated the presence of TPH as gasoline at a .concentration of 2.0 parts per million (ppm) in the grab ground-water sample collected from boring B-14. TPH was not detected in the ground-water sample collected from boring B-15. The soil samples from a depth of 2 feet in B-15 contained 0.1 ppm toluene. No other VOCs or pesticides were detected in any of the soil or water samples analyzed. Supplemental Sampling and Analysis Supplemental field investigations were subsequently performed on November 28 and 29, 1988 to further investigate the possible extent of affected ground water, and assess whether soils in the vicinity of boring B-14 are affected with petroleum hydrocarbons. Six test pits (SS-4 through SS-6 and A-1 through A-3) were excavated at locations within approximately 50 feet of boring B-14 (Figure 3) . Both soil and ground-water samples were collected from test pits SS-4 and SS-5; only ground water was collected from test pits A-1, A-2, and A-3 ; and only soil was collected from test pit SS-6. Soil samples were collected from the test pits at a depth of approximately 5 feet below grade. Soil and ground-water samples were analyzed for TPH, and for benzene, toluene, ethylbenzene, and xylenes (BTEX; volatile constituents of gasoline) using EPA Method 8015 and modified EPA Method 8020. As a result of this sampling and analysis, TPH as gasoline was detected in shallow ground water from only one test pit (A-2) at a concentration of 0.2 ppm. BTEX compounds were detected only in ground water sampled from test pit A-2 . Except for benzene, concentrations for these compounds were significantly below State Department of Health Services (DOHS) Action Levels. Benzene was detected in the sample from test pit A-2 at a concentration of 0.0013 ppm, slightly above the DOHS Action Level of 0.0007 ppm. However, it must be recognized that reconnaissance grab samples collected from the test pits provide qualitative data, and that direct comparisons between concentrations detected through this method and regulatory criteria must be made with caution. Neither TPH nor BTEX compounds were detected in soil or ground-water samples from any of the other sampling locations_ COIlclus1011 Based on these analytical results, soil and ground water in the vi-c i_ li_ty of boring B-14 do riot appear to have becn stab stantially affected by Detrol-euro hydr-oca rhons . The low