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i <br /> 05 May 1997 <br /> AGE-NC Project No 95-0173 <br /> Page 2 of 29 <br /> six soil borings (B1, B2, MW-1 through MW-4) near the former UST area to maximum <br /> depths of 60 feet bsg, borings MW-1 through MW-4 were converted into 2-inch diameter <br /> PVC ground water monitoring wells Concentrations of total petroleum hydrocarbons <br /> quantified as gasoline and diesel (TPH-g and TPH-d, respectively) and volatile aromatics <br /> (benzene, toluene, ethylbenzene and xylenes BTE&X)were detected in both soil and init)al <br /> ground water samples collected from B1, B2 and MW-1 through MW-4 Analytical results <br />' of soil and ground water samples are summarized in Table 1 and Table 2 <br /> On 19 and 20 December 1996, site assessment activities included advancing six soil probe <br />' borings(B3 through B8)downgradient of the former UST area to maximum depths of 40 feet <br /> bsg Concentrations of TPH-g, TPH-d and BTE&X were detected in soil samples collected <br /> from B3, B4 and B6 Analytical results of soil samples are summarized in Table I <br /> Concentrations of TPH-g, TPH-d and BTE&X were detected in grab ground water samples <br /> collected from B3, B4, B6 and B7, ground water samples were not collected from B5 and <br /> B8 Analytical results of grab ground water samples are summarized in Table 3 <br /> • On 16, 17 and 18 June 1997, five ground water monitoring wells (MW-5 through MW-9) <br /> and two soil vapor extraction wells (VW-1 and VW-2) were installed on and off-site as part <br /> of site assessment activities Substantial concentrations of TPH-g, TPH-d and BTE&X were <br /> detected in soil samples collected from MW-6, VW-1 and VW-2, concentrations of TPH-g, <br /> TPH-d and BTE&X were detected in initial ground water samples collected from MW-6, <br /> MW-8 and MW-9 Analytical results of soil and ground water samples are summarized In <br /> Table I and Table 2 <br /> • On 14 July 1997, an eight-hour soil vapor extraction (SVE) pilot test was performed to <br />' provide data to assess SVE as a component of the final remedlat)on system Analytical <br /> results of vapor samples collected during the pilot test are summarized In Table 4, field <br /> measurements collected during the SVE pilot test are summarized In Table 5 <br /> • On 3 and 4 November 1997, two in-situ air sparging (lAS) wells (AW-1 and AW-2) were <br /> dual completed at the site to delineate the vertical extent of petroleum-impact and to serve <br /> as remediation wells Substantial concentrations of TPH-g, TPH-d and BTE&X were <br /> detected in soil and initial ground water samples collected from AW-I and AW-2 Analytical <br /> results of soil and ground water samples are summarized in Table I and Table 2 <br /> • On 13, 14 and 15 January 1998, a 72-hour IAS pilot test was performed to assess feasibility <br /> of IAS as a remediation technique Field measurements collected during the IAS pilot test <br /> are summarized in Table 6 <br /> I Additional background information is summarized In Quarterly Reports submitted to PHS-EHD <br /> (prepared by AGE) between August 1996 and January 1998 <br /> Advanced CeoEnvironmental,Inc <br />