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I Historical Background Den's Auto Repair Page 3 of 3 between 96 feet and 100 feet bsg, and between 118 feet and 122 feet bsg, and ' • CPT-4 was sampled between 78 feet and 82 feet bsg and between 121 feet and 125 feet bsg • Soil samples were collected at 60 and 75 feet bsg In CPT-4 ' Ground water samples collected and analyzed from the water table or hydrologic unit one are p Yz ' reported as follows • TPH-g was reported in a sample from the uppermost water table TPH-g was detected in I sample CPT-3-55 at a concentration of 100 micrograms per liter (µg/l) TPH-g was not detected In the other shallow grab water sample Volatile organic compounds (VOCs) benzene, toluene, ethylbenzene, and xylenes (BTEX) and fuel additives were not detected I In the shallow grab ground water samples Monitoring well data indicates significant concentrations of TPH-g and V OCs near the upper 60 feet of the section at CPT-1 and to a lesser degree In the upper 60 feet of the section at CPT-2 I • TPH-g was reported in samples at depths between 75 and 90 feet bsg TPH-g was detected In sample CPT-1-88, CPT-2-80, CPT-3-75, and CPT-4-82 at concentrations of 1,800 gg/l, 250 gg/l, 170 gg/l, and 470 gg/l, respectively BTEX compounds were detected at a 10 maximum concentration of 34 gg/l of benzene in sample CPT-1-88 Xylene was detected In a sample from HU2 at a maximum concentration of 6 6 gg/l In sample CPT-1-88 DIPE was detected In the same sample at 11 gg/l TPH-g was also reported In samples at depths between 100 and 125 feet bsg TPH-g was detected In samples CPT-1-115, CPT-2-115, CPT-3-100, CPT-3-122 and CPT-4-125 at concentrations of 290 gg/l,230 gg/l, 1,310 gg/l,400 gg/l, and 140 gg/l,respectively BTEX compounds were detected at a maximum concentration of 370 gg/1 of benzene in sample CPT-1-122 Xylene was detected In a sample from HU3 at a maximum concentration of 13 6 gg/l III sample CPT-3-122 DIPE was detected in the sample CPT-1-115 at 6 2 gg/l o The only hydrocarbon detected in the soil samples was at 0 034 milligrams per kilogram I (mg/kg) of benzene In sample CPT-4-60 • Overall, TPH-g and BTEX compounds were detected in the water samples collected from I the lower two hydrologic units(HU2 and HU3) Xylenes were also detected in the lower two HUs The concentrations of benzene appear to Increase with depth both on-site at CPT-1 and north of the site at CPT-3 No benzene was detected In the CPT-2 samples, collected from beneath the former UST area at deep Intervals between 80 and 125 feet bsg • The vertical extent of petroleum hydrocarbon-Impacted ground water has not yet been defined Advanced GeoEnvironmental,Inc