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' 06 November 2002 AGE-NC Project No 95-0137 Page 3 of 7 2 2 1 Well Monitoring and Evacuation A Solinst water level meter was used to measure the depth to ground water in on-site wells MW-1 ' through MW-5 and off-site wells MW-6 through MW-8 (on Jimco Truck Plaza's property)relative to the tops of the well casings The groundwater elevations and gradient were determined from these data(Table 4) After recording water level measurements, disposable plastic bailers were used to purge the on-site monitoring wells MW-1 through MW-5 of standing water Approximately 6 0 to 6 5 gallons of water ' (a minimum of 3 casing water-volumes per well)were removed from MW-1 through MW-5 Ground water temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Purged ground water was contamenzed in properly labeled DOT-approved ' model 17H 55-gallon drums and was stored on-site Field sheets and data are included in Appendix A ' 2 2 2 Collection and Analysis of Ground Water Samples Water samples were collected from the purged wells using new disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each sample ' was transferred into three 40-m1 EPA-approved volatile organic analysis(VOA)vials and into one 1-liter amber bottle Samples were properly labeled, stored in a chilled container and transported under chain-of-custody to MAI Each sample was analyzed for ' Total petroleum hydrocarbons quantified as diesel and gasoline (TPH-d and TPH-g) In accordance with EPA Method 8015 Modified, ' • BTEX compounds and MTBE in accordance with EPA Method 8020, • The oxygenating fuel additives MTBE, tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether(ETBE) and tertiary amyl methyl ether(TAME), ethylene ' dibromide(EDB)and 1,2 dichloroethane(1,2-DCA)in accordance with EPA Methods 8260 ' 3.0. FINDINGS ' From field and laboratory data collected at the SVE remediation system between 11 June and 19 September 2002, AGE determined the average TPH-g concentration, the average flow rate and calculated the approximate mass and volume of hydrocarbons removed Ground water elevation, ' flow direction and gradient were determined from field data collected on 19 September 2002, the contaminant impact to ground water was quantified from the ground water laboratory data ' Advanced G"Environmental,Inc