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' 04 June 2001 <br /> • AGE-NC Project No 98-0465 <br /> ' Page 2 of 4 <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 /> chain-of-custody to McCampbell Analytical, Inc (MAI) for analysis The samples were analyzed <br /> ' for the following <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> ' accordance with EPA Methods 503018015-Modified and 355018015-Modified,respectively <br /> ® Volatile aromatic compounds - benzene, toluene, ethylbenzene and xylenes (BTEX) and <br /> ' methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020, and <br /> © Fuel oxygenates MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether (TAME), and tertiary butanol (TBA) in accordance with EPA <br /> ' Method 8260 Modified <br /> 3.0 ]FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 19 April 2001, the contaminant impact to ground water was assessed from the laboratory analytical <br /> data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> ' At the time of the April 2001 sampling event, depths to ground water ranged from 8 53 feet to 9 53 <br /> feet below the tops of the well casings Relative ground water elevations at the site ranged from 5 79 <br /> feet below mean sea level (MSL) in well MW4 to 5 89 feet below MSL in well MW2 (Table 1) <br /> During this monitoring event,the ground water level in the wells was approximately 3 53 to 4 61 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 /> increased an average of 1 71 feet between the January 2001 and April 2001 monitoring events <br /> Ground water is flowing toward the northwest at an average gradient of 0 0009 feet/feet Figure 3 <br /> illustrates the contoured ground water elevations as measured on 19 April 2001 <br /> 1 Advanced CeoE nvi ron mental,[nc <br />