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