ARCHIVED REPORTS_XR0008273 CASE 1

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' Environmental Mr Harkin Knoll Resources 14 August 1998 Management Page 8 • Ethylbenzene was detected in samples collected from boring B-5 only ' at concentrations that ranged from 12 to 12 mg/kg • Xylenes were detected in all six soil samples analyzed Concentrations detected in samples from boring B-5 ranged from 6 2 to 69 mg/kg,, and the concentrations detected in samples from boring B-6 were 0 014 and 0 029 mg/kg • Tertiary butyl alcohol (TBA) was the only fuel oxygenate detected in soil at the site TBA was detected at a concentration of 0 019 mg/kg in the sample collected at a depth of 36 feet bgs from boring B-6 ' The analytical results of the ground water samples are as follows ' • TPH-g was detected in ground water from both borings B-5 and B-6 at concentrations of 46,000 and 1,500 micrograms per liter (µg/l), respectively The sample chromatograms for these gasoline analyses did not match the gasoline standard and were qualified as tentatively identified by an ERM chemist • All BTEX compounds were detected in ground water from both borings B-5 and B-6 BTEX concentrations in ground water from boring B-5 were 2,300, 310, 570, and 6,500 µg/l for benzene, toluene, ' ethylbenzene, and xylenes, respectively BTEX concentrations in ground water from boring B-6 were 38, 11, 12, and 180 µg/1 for ' benzene, toluene, ethylbenzene, and xylenes, respectively • TBA was detected in ground water from boring B-6 at a concentration ' of 86 Vg/1 No other fuel oxygenate compounds were detected in this sample No fuel oxygenate compounds were detected in ground water from boring B-5 CHEMICAL CONSTITUENTS IN SOIL Based on field observations and analytical results, the soil beneath the ' former UST location is impacted with TPH The chromatograms for soil samples from these borings did not match the gasoline profile, however, the TPH present was tentatively identified as gasoline and likely 1