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I 12 January 2004 AGE-NC Project No 95-0143 ' Page 3 of 5 ' MW-16, MW-17, MW-22, MW-23 and MW-24 using a new disposable plastic bailer, and approximately 50 gallons of water were purged from well MW-9 using a Waterra inertial purge pump Temperature, pH and conductivity of the purged water were measured at regular intervals ' during purging using an Oakton water analyzer All purged water was stored on-site in 55-gallon DOT-approved drums Field data and field logs are included in Appendix B ' 2 2 2 Collection of Ground Water Samples ' Water samples were collected from each purged well using a new, disposable bailer and, upon retrieval,were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative The samples were labeled and transported in a chilled container,under ' chain-of-custody protocol,to McCampbell Analytical, Inc (MAI), a DHS-certified laboratory The samples were analyzed for ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 modified, ' • Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method 8260B, and s The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETRE), methyl ' tertiary-butyl ether(MTBE),tertiary-amyl ether(TANTE),tertiary-butyl alcohol(TBA), 1,2- dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method ' 8260B ' 3.0 FINDINGS Ground water elevation was calculated and flow direction was inferred frons field data, the ' hydrocarbon impact to ground water was quantified from laboratory analysis ' 3 1 GROUND WA rER ELEVATION AND GRADIENT During the May 2003 monitoring event,the average depth to ground water at the site was 16 96 feet tbsg Groundwater was within the screened intervals of wells MW-10, MW-15, MW-16, MW-17, MW-22, MW-23 and MW-24 Ground water ranged from 0 26 feet to 5 85 feet above the screened interval in the other five monitoring wells The elevation of ground water in the twelve wells was calculated by subtracting the depth to water from the surveyed casing elevation (Table 1) The average ground water elevation was 7 52 feet Advanced GeoEnvironmentaf,Inc