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i I12 June 2003 AGE-NC Project No 01-0827 IPage 4of7 I2 3 1 Well Monitoring and Evacuation A Sohnst water level meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-5 and vapor wells VW-1, VW-2d, VW-3 and VW-5d After water levels were gauged,a dedicated disposable bailer was used to purge wells MW-1,MW-3,MW-5,VW-1,VW-2d and VW-5d of a minimum of three casing-water volumes (approximately 3 5 to 16 gallons) of Iground 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 B I2 3 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-rail EPA-approved volatile organic analysis (VOA) vials and one 1-liter amber bottle Samples were stored in a chilled container and transported under chain-of-custody to IMAI, a DHS-certified analytical laboratory Each sample was analyzed for • TPH-g and total petroleum hydrocarbons as diesel(TPH-d)in accordance with EPA Method 8015 Modified, BTEX compounds and fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl ether(RIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE, in I accordance with EPA Method 8260 Modified, and 1,2-Dichloroethane (1,2-DCA) and ethylene dibromide (EDB), ethanol and methanol by EPA Method 8260 I 3.0. FINDINGS From field data collected at the SVE remediation system between January and May 2003, AGE determined the average TPH-g concentration and the average flow rate Ground water flow direction and gradient were determined from the field data collected on 23 May 2003,the contaminant impact to ground water was assessed from the laboratory analysis of the ground water samples I3 1 SOIL-VAPOR EXTRACTION The SVE unit was operated continuously during the period between 15 January and 15 May 2003, except during maintenance, the unit typically operated at between 105 to 129 cubic feet per minute Advanced GeuBn"mnmental,Inc I