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I � 25 February 2002 1 AGE-NC Project No 00-0764 Page 6of8 UST area The highest concentration of BTEX compounds were detected in the sample B1-10 at 400 mg/kg total xylenes Benzene was not detected in the soil samples analyzed • BTEX compounds were not detected in any of the samples collected from the other soil borings Fuel additives were not detected in the soil samples • Various VOCs were detected in the soil samples collected from soil boring B1, at varying concentrations Naphthalene was detected at concentrations as high as 24,000 micrograms per kilogram (µg/kg) at depths above 30 feet bsg Isopropylbenzene was detected at concentrations as high as 8,100µg/kg at depths above 40 feet bsg N-propyl benzene was detected at concentrations as high as 4,300µg/kg at depths above 40 feet bsg N-butylbenzene was detected at concentrations as high as 20,000gg/kg at depths above 40 feet bsg 1,2,4- ' tnmethylbenzene and 1,3,5-tnmethylbenzene were detected at concentrations as high as 190,000�ig/kg at depths above 60 feet bsg A stratigraphic cross section of impacted soil is depicted in Figure 7 Analytical results of soil samples analyzed for petroleum hydrocarbons are summarized in Tables 1 and 2 The complete laboratory reports (MAI Laboratory ID 81995 to 82010), quality assurance and quality control (QA/QC) reports and chains-of-custody are included in Appendix B ' 4 3 HYDROCARBON-IMPACTED GROUND WATER A total of five grab water samples were collected on the site Each sample was analyzed for TPH-g, TPH-d, BTEX, MTBE, and each sample was analyzed for the full suite of fuel additives • TPH-g was detected in four of the grab ground water samples collected from the site at concentrations ranging from 72 microgram per liter (µg/1) to 33,000 µg/1 TPH-d was detected in all five of the grab ground water samples analyzed at concentrations ranging from 260 µg/1 to 19,000 µg/l • Benzene was detected in two of the water samples analyzed at concentrations ranging from 0 55 µg/1 in boring B3 to 0 65 µg/1 in boring B4 Toluene was detected in each of the water ' samples analyzed at concentrations ranging from 0 55 gg/1 in boring B3 to 57 µg/1 in boring B2 Other BTEX compounds were also detected at concentrations up to 7,200 µg/1(BI-40) • 1,2-DCA was detected in two ground water samples at concentrations of 1 5 µg/1 in boring ' B2 and 4 8 µg/1 in boring B4 • Distnbution of TPH-g, TPH-d and BTEX concentrations in shallow ground water are displayed on Figures 3, 4 and 5 ' Advanced GeoEnvironmental,Inc 1