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' Site Background Information - Guardino and Crawford • Page 4 of 6 On 14 November 2000,three soil probe borings (P9 through Pl l)were advanced at the site, under ' observation by the EHD Probe borings were advanced in the area of the former USTs and in the areas north and east of the former UST dispenser Boring P9 was advanced to a depth of 35 feet bsg, boring P10 was advanced to a depth of 40 feet bsg, and boring PI I was advanced for collection of ' a grab ground water sample to 20 feet bsg • TPH-g and BTEX compounds were detected in soil samples collected from probe boring P9 ' TPH-g was detected in samples from 15 and 20 feet bsg at 11 mg/kg and 76 mg/kg, respectively TPH-g and BTEX compounds were not detected in soil samples collected from ' probe boring P9 BTEX compounds were detected in soil samples collected from probe boring P10 at 30 feet bsg at concentrations as high as 0 12 mg/kg (xylenes) Benzene was detected in two soil samples, P9-20 and P10-30, at concentrations of 0 14 mg/kg and 0 021 mg/kg, respectively MTBE was not detected in the soil samples analyzed by EPA Method 8020 • TPH-g and BTEX compounds were detected in each of the grab ground water samples ' collected and analyzed TPH-g was detected in the ground water samples collected from probe boring P9 at a concentration of 35,000µg/1, at a concentration of 760 µg/1 from the grab groundwater sample collected from boring PI 0,and at a concentration of 660 pLg/l from ' . the grab ground water sample collected from boring PI BTEX compounds were detected at concentrations as high as 3,400 µg/l (xylene) in the grab ground water sample collected ' from P9 Benzene was detected at concentrations as high as 380 µg/l in the grab ground water sample collected from P9 MTBE was detected in one ground water sample analyzed by EPA Method 8020 at a concentration of 7 7 µg11 MTBE was detected by EPA Method 8260 in grab water samples P9, P10, and P11 at concentrations of 21 µg11, 16 µg/1, and 5 3 µg/l, respectively TBA was also detected EPA Method 8260 in the grab ground water sample collected from boring P 11 at a concentration of 22 µg/l ' On 20 September 2004, two additional ground water monitoring wells (MW-7 and MW-8) were P Installed at the site Pilot borings MW-7 and MW-8 were completed as ground water monitoring ' wells of the same designations using 2-inch diameter, Schedule 40 polyvinylchloride(PVC)casing, 0 020-inch slotted screen was installed from approximately 10 feet to 25 feet bsg in both borings ' with blank casing extending to the surface A total of seven soil samples were collected from the borings and analyzed for the petroleum hydrocarbon constituents, no petroleum hydrocarbon constituents were detected at or above laboratory reporting limits On 12 October 2004, one soil boring (CPT-1) was advanced on-site utilizing cone penetrometer testing (CPT) technology A total of three grab ground water samples were collected (one sample ' each from HU1, HU2, and HU3) and submitted for laboratory analysis for petroleum hydrocarbon constituents, no petroleum hydrocarbons were detected at or above laboratory reporting limits Advanced GeoEnvlronmentai,Inc