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12 September 2002 <br /> . AGE-NC Project No 95-0137 <br /> ' Page 3 of 8 <br /> t2 2 1 Well Monitoring and Evacuation <br /> A Sollnst water level meter was used to measure the depth to ground water In the five wells relative <br /> to the tops of the well casings The groundwater elevations and gradient were determined from these <br /> data (Table 2) <br /> ' After recording water level measurements,disposable plastic bailers were used to purge monitoring <br /> wells MW-1 through MW-5 of standing water Approximately 5 0 to 7 0 gallons of water <br /> (a minimum of 3 casing water-volumes per well)were removed from MW-1 through MW-5 Ground <br /> ' water temperature,pH and conductivity were measured at regular Intervals during purging using an <br /> Oakton water analyzer Purged ground water was containerized In properly labeled DOT-approved <br /> model 17H 55-gallon drums and was stored on-site Field sheets and data are Included In <br /> ' Appendix A <br /> ' 2 2 2 Collection and Analysis of Ground Water Samples <br /> lie <br /> Water samples were collected from the purged wells using new disposable plastic bailers after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each sample <br /> was transferred Into three 40-m1 EPA-approved volatile organic analysis (VOA) vials and Into one <br /> ' 1-liter amber bottle Samples were properly labeled, stored In a chilled container and transported <br /> under chain-of-custody to MAI Each sample was analyzed for <br /> • Total petroleum hydrocarbons quantified as diesel (TPH-d) and TPH-g In accordance with <br /> ' EPA Method 8015 Modified, <br /> • BTEX compounds and MTBE In accordance with EPA Method 8020, <br /> ' • The oxygenating fuel additives MTBE, tertiary butyl alcohol (TBA), di-Isopropyl ether <br /> (DIPE), ethyl tertiary butyl ether(ETBE) and tertiary amyl methyl ether(TAME), ethylene <br /> ' dlbromlde(EDB)and 1,2 dichloroethane(1,2-DCA)in accordance with EPA Methods 8260 <br /> ' 3.0. FINDINGS <br /> From field and laboratory data collected at the SVE remediation system between 13 December 2001 <br /> ' and I 1 June 2002, AGE determined the average TPH-g concentration, the average flow rate and <br /> calculated the approximate mass and volume of hydrocarbons removed Ground water elevation, <br /> flow direction and gradient were determined from field data collected on 19 February and 19 June <br /> ' 2002,the contaminant Impact to ground water was quantified from the ground water laboratory data <br /> Advanced GeoEnvironmental,Inc <br />