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I Results of the October 1997 investigation were reported in Quarterly Report- October & S November 1997, dated 18 December 1997 January 1998 - A 72-hour air-sparge pilot test was performed at the site to provide data to assess in-situ air sparging (IAS) as a component of the final remediation system A theoretical radius of influence of at least 40 feet was estimated during the pilot test while injecting compressed air at a rate of 15 psi from wells AW-1 and AW-2 Results of IAS pilot test were reported in Corrective Action Plan -May 1998, dated 05 May 1998 ® July 1998 - One soil boring (B-10) and three ground water monitoring wells (MW-10 through MW-12)and were installed on and off-site to maximum depths of 95 feet bsg,wells MW-10 through MW-12 were single-completed utilizing 2-inch diameter PVC casing ' screened 20-40 feet bsg Analytical results of soil samples did not detected any petroleum hydrocarbon-impact from B-10 or MW-10 through MW-12 Analytical results of initial water samples detected TPH-g from MW-11 at a concentration of 67 Ag/l and toluene as high ' as 0 58 µg/1 Results of the July1998 investigation were reported in Quarterly Report-July 1998, dated 18 September 1998 ' November&December 1999-Five additional air-sparge wells (AW-3 through AW-7) and five additional SVE wells were installed at the site to maximum depths of'12 feet bsg as part of the site's soil and ground water corrective action plan, the above air sparge wells were ' single-completed utilizing 2-inch diameter PVC casing screened 35-40 feet bsg, the above SVE wells were single-completed utilizing 2-inch diameter PVC casing screened 15-30 feet bsg No soil or ground water samples were collected during the above air sparging and SVE ' well installations,well installation procedures were detailed in Remedial Action Work Plan, dated 30 December 1998 • April 2000-An SVE and air sparging remediation system was initiated(LAS and SVE start- up) and continuously operated at the site The SVE system utilized a Solleco Ecat 250 catalytic converter vapor recovery extraction system Two-inch diameter, schedule 40 PVC piping was installed underground from each SVE well-head (VW-1 through VW-7) to the inlet of the Solleco Ecat 250 vacuum blower, the outlet from the vacuum blower was routed through the catalytic converter The IAS system utilized a 5 horsepower, Speedaire(model no 5F229B) electric air compressor to inject air beneath the water table From the outlet of the air compressor, a manifold network of one-inch diameter, schedule 80 PVC piping was installed underground to air sparge wells AW-1 through AW-7 and monitoring wells MW-1 ' through MW-3 IAS and SVE start-up procedures were detailed in Remedial Action Work Plan, dated 30 December 1998 • October 2000 - One ground water monitoring wells (MW-13) was installed on-site to a maximum depth of 100 feet bsg, well MW-13 was single-completed utilizing 2-inch diameter PVC casing screened 95-100 feet bsg Analytical results of soil samples detected TPH-g from MW-13 as deep as 95 feet bsg at concentrations as high as 740 mg/kg and BTEX constituents at concentrations as high as 51 mg/kg xylenes Analytical results of the initial water sample detected TPH-g at a concentration of 13,000µg/1 and BTEX constituents as high as 2,000 µg/1 toluene/xylenes Results of the October 2000 investigation were reported by AGE in Ground Water Monitoring Well Installation Report- Yd Quarter 2000, APPENDIX A