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le <br /> at OW-2. Much lower TPH levels were found at OW-3 (59 parts per billion) <br /> and OW-6 (11 ppb) . TPH were not detected in groundwater samples collected <br /> from OW-1, OW-4 or OW-5 (detection limit was 1 ppb) . <br /> Figure 9 shows the estimated horizontal TPH isoconcentration lines for <br /> groundwater in the vicinity of the former underground tank, based on results <br /> of this investigation. <br /> Benzene Toluene Eth lbenzene and Xylenes BTEX <br /> BTEX were found during this investigation in soil samples collected from <br /> OW-2. The highest levels were found near the encountered water table (B <br /> 16 ppm, T — 17 ppm, E — 45 ppm, X = 83 ppm) . BTEX levels dropped off <br /> rapidly within 2 feet above and below that depth. Analyses of soil <br /> samples collected from all other borings indicated nondetectable levels of <br /> BTEX (detection limit was 0.5 ppm) . <br /> BTEX were found in duplicate groundwater samples collected during this <br /> investigation from OW-2 (B — 850 and 670 ppb, T e 640 and 350 ppb, E s 59 <br /> and 7 ppb, X a 3000 and 2700 ppb) , a single sample collected from OW-3 (B <br /> ND, T — 1 ppb, E — ND, X — 12 ppb) and a single sample collected from OW-6 <br /> (B — ND, T — 1 ppb, E = ND, X — 2 ppb) . Analyses of groundwater samples <br /> collected from all other wells showed nondetectable BTEX levels (detection <br /> limit was 0.5 ppb for B, T, E or X) . <br /> Ethylene Dibromides 1.2-Dichloroethane and Polynuclear Aromatic Hydrocarbons <br /> During this investigation, ethylene dibromide, 1,2-dichloroethane and <br /> polynuclear aromatic hydrocarbons were not detected in any groundwater <br /> samples collected as part of this investigation. Detection limits for these <br /> parameters were 0.02 ppb, 0.5 ppb and 10 ppb, respectively. <br /> Lead <br /> During this investigation, total lead was detected in soil samples at <br /> concentrations ranging from nondetectable to 11 ppm (detection limit for <br /> soils was 5 ppm) , with no apparent relationship to hydrocarbon distribution. <br /> 3286a/BAV100 26 <br />