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30 October 2000 <br /> AGE-NC Project No. 95-0197 <br /> ' Page 2 of 4 <br /> ' amber bottle and three 40-m1 volatile organic analysis (VOA) vials containing 0.5 ml of 18% <br /> hydrochloric acid as a sample preservative. Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping. The samples were properly labeled, placed in a <br /> chilled container and transported under chain-of-custody to McCampbell Analytical Inc. (MAI). The <br /> samples were analyzed.for the following: <br /> ' • Total petroleum.hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively)by EPA Method 8015M, <br /> ' • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl-tertiary butyl ether (MTBE) by EPA Method 8020, and <br /> 0 Tertiary butanol (TBA), di-isopropyl ether (RIPE), ethyl tert butyl ether (ETBE), tertiary <br /> arnyl methyl ether(TAME) and MTBE by EPA Method 8260M. <br /> 1 <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 25 September 2000; the contaminant impact to ground water was assessed from the laboratory <br /> analytical data. <br /> 3.1. GROUND WATER ELEVATION.AND GRADIENT <br /> The measured depths to ground water in the monitoring wells were between 14.44 and 15.04 feet <br /> ' below the tops of well casings. Ground water elevations were calculated at 9.70 feet to 9.79 feet <br /> below mean sea level (Figure,3). Ground water.elevation at the site decreased an average 1.17 feet <br /> between the June 2000 and the September 2000 ground water monitoring events.The general ground <br /> water gradient at the site was calculated to be approximately 0.001 feet/feet or approximately 16 feet <br /> per mile. The general ground water flow direction was calculated to flow towards the northeast. The <br /> ground water elevation contours are depicted on Figure 3. <br /> During this monitoring event, the depths to ground water in the wells are approximately 2.1 to 5.5 <br /> feet below the tops of the well screens, indicating that the wells are screened properly and yield <br /> ' representative ground water samples. <br /> Advanced GeoEnvironmental,Inc. <br /> i 1 <br />