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10 December 2001 <br /> ' AGE-NC Project No 98-0465 <br /> ' Page 2 of 4 <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic bailers Each <br /> ' water sample was transferred into one 1-liter amber bottle with no sample preservative and into three <br /> 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After <br /> collection, the samples were properly labeled, placed in a chilled container and transported under <br /> ' cham-of-custody to McCampbell Analytical, Inc (MAI) for analysis The samples were analyzed <br /> for <br /> ' 0 Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 503018015-Modified and 3550/8015-Modified,respectively <br /> 0 Benzene,toluene,ethylbenzene and xylenes(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> in accordance with EPA Method 8020, and <br /> ' 0 Fuel oxygenates - MTBE, di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether (TAME), and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260 Modified <br /> ' 3.4. FENMINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 19 October 2001,the contaminant impact to groundwater was quantified by the laboratory analytical <br /> data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the trine of the October 2001 sampling event, depths to ground water ranged from 12 34 feet to <br /> 13 35 feet below the tops of the well casings Ground water elevations at the site ranged from 9 60 <br /> feet below paean sea level (MSL) in well MW4 to 9 71 feet below MSL in well MW2 (Table 1) <br /> During this monitoring event,the ground water level in the wells was approximately 7 34 to 8 44 feet <br /> below the tops of the well screens, indicating that the wells are screened properly and yield <br /> representative shallow ground water samples The relative ground water elevation at the site <br /> decreased an average of 1 64 feet between the July 2001 and October 2001 monitoring events <br /> Ground water flow direction at the site was generally toward the northwest at an average gradient <br /> of 0 001 feet/feet Figure 3 illustrates the contoured ground water elevations as measured on <br /> 19 October 2001 <br /> 1 <br /> Advanced GeoEnvzronmental,Inc <br />