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i <br />' 03 March 2004 <br /> AGE-NC Project No 95-0143 <br /> Page 2 of 4 <br /> 2 12 Collection of Ground Water Samples <br /> Water samples were collected from each purged well using a new, disposable bailer and, upon <br /> retrieval, were transferred into 40-m1 EPA-approved volatile organic analysis (VOA) vials <br /> containing 0 5 ml 18% hydrochloric acid as a sample preservative The samples were labeled and <br /> transported in a chilled container,under chain-of-custody protocol,to McCampbell Analytical, Inc <br /> (MAI), a DHS-certified laboratory The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method <br /> 8260B, and <br /> • The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl <br /> tertiary-butyl ether(MTBE),tertiary-amyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2- <br /> dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method <br /> 8260B <br /> 30. FINDINGS <br /> Ground water elevation was calculated and flow direction was inferred from field data, the <br /> hydrocarbon impact to ground water was quantified from laboratory analysis <br /> 31 GROUND WATER ELEVATION AND GRADIENT <br /> During the 07 August 2003 monitoring event, the average depth to ground water at the site was 189 <br /> feet bsg Groundwater was within the screened intervals of wells MW-10, MW-14, MW-15, MW- <br /> 16, MW-17, MW-22, MW-23 and MW-24 Ground water was feet above the screened interval in <br /> the other monitoring wells <br /> The elevation of ground water in the twelve wells was calculated by subtracting the depth to water <br /> from the surveyed casing elevation(Table 1) The average ground water elevation was 8 5 feet below <br /> mean sea level (MSL), a decrease of 1 foot since the May 2003 monitoring event The inferred <br /> ground water flow direction was toward the northeast with a gradient of 0 003 foot/foot Ground <br /> water elevation contours for the August 2003 monitoring event are illustrated in Figure 3 <br /> Advanced GeoEnvironmentai,Inc <br /> I <br />