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{ I 1 r a 15 February 2000 AGE-NC Protect No 98-0448 IPage 3 of 33 ranging as high as 3 10 mg/kg, MTBE was detected in soil samples collected from EW-1 at ' a depth of 20 feet bsg and at a concentration of 0 0076 mg/kg Initial ground water samples collected from MW-8 detected TPH-g, BTEX compounds and MTBE at concentrations ranging as high as 110 ,ug/l, 4 yg/l and 5 3 ug1l, respectively Analytical results of soil samples are summarized in Table 1, analytical results of ground water samples are summarized in Table 2 • In July 1999, an 8-hour ground water draw-down pilot test (pump test) was initiated at the site to evaluate feasibility of ground water pump and treat as a remedial alternative and to evaluate aquifer charactenstics such as hydraulic conductivity,transmissivity and draw-down at various pumping rates Draw-down results were continuously recorded utilizing a data logger and are presented in Appendix A • In August 1999, a 48-hour In-Situ Air Sparge (IAS)pilot test was perfonned at the site to assess feasibility of IAS as a remediation technique Field measurements collected during the IAS pilot test are summarized in Tables 3, 4, 5, 6 and 7 • In November 1999,two soil vapor extraction(SVE)wells(VW- 1 and VW-2)were installed at the site to accommodate an SVE pilot test Soil samples collected from VW-1 at a depth of 30 feet bsg contained TPH-g and BTEX compounds at concentrations as high as 590 mg/kg Analytical results of soil samples are summarized in Table 1 ' • In December 1999, an 8-hour SVE pilot test was performed at the site to provide data to assess SVE as a potential component for the final remediation system Analytical results of vapor samples collected during the pilot test are shown in Table 8, field measurements collected during the SVE pilot test are presented in Table 9 • Between October 1994 and September 1999, thirteen ground water monitoring and sampling events were performed at the site TPH-g was detected in samples collected from wells MW-1, MW-2, MW-3, MW-4A, MW-4B and MW-6 at concentrations as high as 170,000 ug/l, BTEX compounds were detected from all wells at the site at concentrations as high as ' 40,000µg/l Fuel oxygenating compounds (methyl tertiary butyl ether, dl-Isopropyl ether and Cert butanol) were detected from wells MW-1, MW-2, MW-4B, MW-6 and MW-8 at concentrations as high as 91 1-ig/1 ' Additional background Information prepared by John P Cummings & Associates is summanzed in the Report 4' Quarterly Monitoring, dated 21 November 1997 and submitted to the PHS-EHD Additional background information for the site was prepared by AGE and submitted to the PHS- I EHD in the following Quarterly Reports June 1998 (dated 20 July 1998), September 1998 (dated 29 October 1998),December 1998 (dated 29 January 1999),March 1999 (dated 04 June 1999), June 1999 (dated 25 August 1999) and September 1999 (dated 08 November 1999) Advanced GeoEnvironmental,Inc 'q a