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I07 February 2005 • AGE-NC Project No 97-0326 ' Page 2 of 5 21 WELL MONITORING AND EVACUATION On 29 June 2004, the depth to ground water in all monitoring wells was measured from the top of each well casing to the nearest 0 01-foot utilizing a Sollnst water level meter Ground water elevation ' In each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) After water levels were measured, a Watera hydrolift pump was used to purge each well Approximately six gallons of water (a minimum of 3 casing water volumes per well) were purged ' from single-level wells MW-2, MW-3 and MW-7, and between 0 45 and 4 0 gallons were purged from multi-level wells MW-8 and MW-9 Ground water temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Purged ground water was containerized in properly labeled Department of Transportation (DOT)-approved 55-gallon drums and stored on-site Field sheets and data are included in Appendix B Free product was observed in well MW-1 A disposable bailer was used to remove the free product Ground water was not purged from well MW-1 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' Water samples were collected from each purged well using a pre-cleaned inertia pump after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume Each water sample was transferred into three 40-milliliter(ml)volatile organic analysis (VOA)vials containing 0 5 ml ' 18%hydrochloric acid as a sample preservative After collection,the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to CTEL, a DHS-certified analytical laboratory, for analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with EPA ' Method 8015M, and • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA), methanol and ethanol in accordance with EPA Method ' 8260B 1 • ' Advanced GeoEnvironmental,Inc 1