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Site Background Information: Dens Auto Repair <br /> Page 4 of 8 <br /> detected in sample CPT1-88, CPT2-80, CPT3-75, and CPT4-82 at concentrations of <br /> 1,800 gg/l,250 gg/l, 170 gg/l,and 470 gg/1,respectively.BTEX compounds were detected <br /> at a maximum concentration of 34 gg/l benzene in sample CPT 1-88.Xylenes were detected <br /> in a sample from HU2 at a maximum concentration of 6.6 gg/1 in sample CPT 1-88. DIPE <br /> was detected in the same sample at 11 gg/l. <br /> •. TPH-g was also reported in samples at depths between 100 feet and 125 feet bsg.TPH-g was <br /> detected in samples CPT1-115, CPT2-115, CPT3-100, CPT3-122, and CPT4-125 at <br /> concentrations of 290 gg/l,230 gg/l,310 gg/l, 1,400 gg/l,and 140 gg/l,respectively.BTEX <br /> compounds were detected at a maximum concentration of 370 µg/1 benzene in sample <br /> CPT 1-122. Xylenes were detected in a sample from HU3 at-a maximum concentration of <br /> 13.6 µg/1 in sample CPT3-122. DIPE was detected in sample CPT 1-115 at 6.2 gg/l. �- <br /> • The only hydrocarbon detected in the soil samples was benzene, at a concentration of <br /> 0.034 mg/kg, in sample CPT4-60. <br /> • Overall, TPH-g and BTEX compounds were detected in.the water samples collected from <br /> the lower two hydrologic units(HU2 and HU3).Xylenes were also detected in the lower two <br /> HUs.The concentrations of benzene appear to increase with depth both on-site at CPT-1 and <br /> j north of the site at CPT-3. No benzene was detected in the CPT-2 samples, collected from <br /> beneath the former UST area at deep intervals between 80 feet and 125 feet bsg. <br /> • The vertical extent of petroleum hydrocarbon-impacted ground water had not been defined <br /> by the CPT investigation(Figures A1,A2 and A3). <br /> ADDITIONAL VERTICAL AND LATERAL ASSESSMENT <br /> Four ground water monitoring wells (MW-4 through MW-7) were installed on 13, 14 and 15 <br /> September 2005. Pilot borings MW-4 through MW-7 were completed as ground water monitoring <br /> wells using two-inch diameter PVC casing with. 0.020-inch slotted screen installed from <br /> approximately 110 feet to 120 feet bsg in boring MW-4,from 60 feet to 65 feet bsg in borings MW-5 <br /> and MW-6 and from approximately 109 feet 119 feet bsg in boring MW-7. <br /> i <br /> Advanced GeoEnvironmental,Inc. <br /> I <br />