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lie 30 December 1998 AGE-NC Project No 95-0173 ' Page 2 of 12 ' six soil borings (BI, B2, MW-1 through MW-4) near the former UST area to maximum depths of 60 feet bsg, borings MW-I through MW-4 were completed as 2-inch diameter ground water monitoring wells Concentrations of total petroleum hydrocarbons quantified ' as gasoline and diesel (TPH-g and TPH-d, respectively) and volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTEX) were detected in both soil and ground water samples collected from B1, B2 and MW-1 through MW-4 ' On 19 and 20 December 1996, six soil probe borings (B3 through 138) were advanced downgradient of the former UST area to maximum depths of 40 feet bsg Concentrations of ' TPH-g, TPH-d and BTEX were detected in soil samples collected from B3, B4 and B6 Concentrations of TPH-g, TPH-d and BTEX were detected In grab ground water samples collected from B3, B4, B6 and B7 ' On 16, 17 and 18 June 1997, five ground water monitoring wells (MW-5 through MW-9) and two soil vapor extraction wells(VW-I and VW-2)were installed on and off-site TPH-g, TPH-d and BTEX were detected in soil samples collected from MW-6, VW-1 and VW-2, TPH-g, TPH-d and BTEX were detected in ground water samples collected from MW-6, MW-8 and MW-9 lie - On 14 July 1997, an eight-hour soil vapor extraction (SVE) pilot test was performed to provide feasibility data and assess potential effectiveness as a component of the final ' remediation system • On 3 and 4 November 1997, two In-situ air sparging (IAS) wells (AW-I and AW-2) were installed at the site Each IAS well was dual-completed to delineate the vertical extent of ' petroleum-impact and serve as potential air infection points TPH-g, TPH-d and BTEX were detected in soil and ground water samples collected from AW-I and AW-2 ' • On 13, 14 and 15 January 1998, a 72-hour IAS pilot test was performed to assess feasibility of lAS potential effectiveness as a remediation component ' • On 01 through 03 July 1998, one soil boring (B 10) was advanced on-site and three ground water monitoring wells (MW-10 through MW-12) were installed off-site to continue delineation of the lateral and vertical extent of impacted soil and ground water Petroleum hydrocarbons were not detected in soil samples analyzed However, dissolved petroleum hydiocaibons were detected front ground water s unples collected at MW-11 and MW-12 ' Additional background information was prepared by AGE and submitted to the PHS-EHD in the Preliminary Investigation and Evaluation Report dated 09 September 1996, in the Corrective Action Plan dated 05 May 1998 and in quarterly reports dated 28 February 1997, 08 May 1997, 11 August 1997, 18 December 1997, 09 March 1998, 22 June 1998, 18 September 1998 and 17 December 1998 ' Advanced GeoEnl lronmenta[,Inc