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• 12 May 2004 AGE-NC Project No 01-0827 Page 2 of 4 2 2 1 Well Monitoring and Evacuation A Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-1, MW-3, MW-5, MW-6, and vapor wells VW-1, VW-2d, VW-3 and VW-5d After water levels were gauged, a dedicated disposable bailer or waterra bailer was used to purge the wells of a minimum of three casing-water volumes (approximately 3 to 20 gallons) of ground water Temperature, pH, and conductivity were measured at regular intervals during purging using an Oakton model water analyzer Purged water from impacted wells was stored on-site in 55-gallon drums The field data sheets are included in Appendix A 2 2 2 Ground Water Sample Collection and Analysis Water samples were collected from the monitored wells using new disposable 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 one 1-liter amber bottle The samples were stored in a chilled container and transported under chain-of-custody to CalTech Environmental Laboratory(CTEL) a DHS-certified analytical laboratory The samples were analyzed for Total petroleum hydrocarbons as gasoline and diesel (TPH-g/TPH-d) in accordance with EPA Method 8015 Modified and • Benzene, toluene, ethylbenzene and total xylenes(BTEX) compounds and fuel oxygenated compounds-tertiarybutanol(TBA),di-isopropyl ether(DIPE),ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME)and MTBE,in accordance with EPA Method 8260 Modified, and 1,2-Dichloroethane(1,2-DCA)and ethylene dibromide(EDB),ethanol and methanol by EPA Method 8260 3.0. FINDINGS AGE determined ground water flow direction and gradient was calculated from the field data collected on 26 March 2004, the contaminant impact to ground water was assessed from the laboratory analysis of the ground water samples Advanced GeoEnvironmental,Inc