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E05 May 2005 • AGE-NC Project No 99-0645 IPage 3 of 6 process (Appendix B) Purged water was stored on-site in 55-gallon, DOT-approved drums 2 4 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Prior to collection of ground water samples, the depth to ground water was re-measured in each purged well to ensure that a minimum of 80% of the well volume had recharged Then a water sample was collected from each well using the dedicated disposable plastic bailer Each water sample was transferred into three chilled 40-m1 volatile organic analysis(VOA)vials containing 0 5 E ml hydrochloric acid(18%)as a sample preservative and one i-liter amber bottle After collection, the samples were labeled and placed in a chilled container for transportation under chain of custody to CTEL, a California DHS-certified analytical laboratory, in Paramount, California Each sample Ewas analyzed for • TPH-g and diesel (TPH-d) by EPA Method 8015M, E • BTEX and the oxygenated fuel additives MTBE,tertiary butyl alcohol (TBA),di-isopropyl ether(DIPS),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME),ethyl- E • dibromide (EDB) and 1,2-dichloroethane (1,2-DCA)by EPA Method 8260 Modified E3.0. FINDINGS E From field data collected at the SVE remediation system between December 2004 and 08 March 2005,AGE determined the average TPH-g concentration and the average air flow rate,and calculated the approximate mass and volume of hydrocarbons removed Ground water elevation and E flow direction were determined from the field data collected on 25 January 2005, hydrocarbon- impact to ground water was inferred from laboratory analysis of the samples E3 1 SOIL-VAPOR EXTRACTION E During the first quarter 2005, the SVE unit operated at an average air flow rate of 65 scfm, generating an induced vacuum (negative pressure) of approximately 30 inches of water, measured in the piping between the blower and extraction well The SVE unit operation was continuous over Ethe quarter,until 08 March when the system was disengaged due to carbon breakthrough The carbon media was replaced on 23 March 2005, when the system was re-started E21 January TPH-g was detected from the influent SVE sample at a concentration of 450 micrograms per liter(µg/1), BTEX compounds were detected at 2 0 µg/l toluene, 3 8 µg/l ethylbenzene, 41 µg/1 EAdvanced GeoEnvironmental,Inc E