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' 29 October 2003 <br /> AGE-NC Project No 01-0827 <br />' Page 2 of <br />' 2 2 1 Well Monitoring and Evacuation <br /> A Sollnst water level meter was used to measure the depth to ground water in monitoring wells <br />' MW-1, MW-3, MW-5, MW-6, and vapor wells VW-1, VW-2d, VW-3 and VW-5d After water <br /> levels were gauged, a dedicated disposable bailer or waterra bailer was used to purge the wells of <br /> a minimum of three casing-water volumes (approximately 3 to 20 gallons) of ground water <br />' Temperature, pH, and conductivity were measured at regular intervals during purging using an <br /> Oakton model water analyzer Purged water from impacted wells was stored on-site in 55-gallon <br /> drums The field data sheets are included in Appendix A <br /> 2 2 2 Ground Water Sample Collection and Analysis <br />' Water samples were collected from the monitored wells using new disposable bailers after allowing <br /> the wells to achieve a minimum 80% recovery of the pre-purge water volume Each sample was <br />' transferred into three 40-m1 EPA-approved volatile organic analysis (VOA) vials and one 1-liter <br /> amber bottle The samples were stored in a chilled container and transported under chain-of-custody <br /> • to CalTech Environmental Laboratory(CTEL) a DHS-certified analytical laboratory The samples <br /> were analyzed for <br /> 1 Total petroleum hydrocarbons as gasoline and diesel (TPH-g/TPH-d) in accordance with <br /> EPA Method 8015 Modified, <br /> • Benzene,toluene, ethylbenzene and total xylenes (BTEX) compounds and fuel oxygenated <br />' compounds-tertiarybutanol(TBA),di-isopropyl ether(DIPE),ethyl tertbutyl ether(ETBE), <br /> tert amyl methyl ether(TAME)and MTBE,in accordance with EPA Method 8260 Modified, <br /> and 1,2-Dichloroethane(1,2-DCA)and ethylene dibromide(EDB),ethanol and methanol by <br />' EPA Method 8260 <br />' 3.0. FINDINGS <br />' AGE determined ground water flow direction and gradient were determined from the field data <br /> collected on 29 September 2003, the contaminant impact to ground water was assessed from the <br /> laboratory analysis of the ground water samples <br /> 1 <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> On 29 September 2003,depths to groundwater in monitoring wells MW-1 through MW-6 and vapor <br />' wells VW-1, VW-2d, VW-3 and VW-5d ranged from 22 95 to 24 55 feet below the tops of the <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />