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TreadvvelORD110 1,800 and 8,100 mg/kg respectively Significant concentrations of TPHg were detected above and near the groundwater table, but not below it For example, the samples from boring 16B-6b at 16 5, IS 5 (the approximate groundwater elevation), and 24 5 feet bgs, contained TPHg concentrations of 16,000, 6,000 and below detection limits MTBE was not detected in any samples at method detection limits Benzene was below detection limits in all soil samples except for the samples from B16-7b at 17 feet bgs and 16B-11 at 25 feet bgs, which contained 100 mg/kg and 0 17 mg/kg respectively Benzene may have been present in other samples with high TPHg concentrations, but the high TPHg concentrations resulted in elevated benzene detection limits Various amounts of toluene, ethylbenzene, total xylenes compounds were detected in samples that contained TPHg, as shown in Table 1 The analytical laboratory qualified several of the TPHg detections as not matching the standard pattern, but stated that the product could be older degraded gasoline 4.3 2 Groundwater Results Prior to sampling, a new bailer was lowered into all of the wells in the investigation area (VW-1, VW-2, VW-3, VW-5, EW-3, EW-4 and MW-3) and each boring to look for free product Free product was not identified in the vapor wells VWI through VW5, extraction wells (EW3 and EW4) or monitoring well MW-3 A hydrocarbon sheen and strong hydrocarbon odor were noted in all of the borings except for 16B-11 Strong hydrocarbon odors were noted in all wells except for VW-1 and VW-2 Groundwater samples were obtained from groundwater extraction well EW-4, and from borings 16B-6b and 16B-8 through 16B-11 Boring 16B-7b was advanced with a small drill rig that met refusal at 18 feet bgs, before groundwater was encountered EW-4 was not purged pnor to sampling 6 ' 25971014 DGD 7 Apn12004