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16 April 2002 <br /> AGE-NC Project No 95-0167 <br />' Page 2 of 4 <br /> transferred Into 40-m1 VOA vials containing 0 5 ml 18%hydrochlonc acid as a sample preservative <br /> After collection, the samples were properly labeled, placed in a chilled container and transported <br /> under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), and 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) and the oxygenated ether methyl <br /> tertiary-butyl ether(MTBE) in accordance with EPA Method SW846 8021, and <br /> 1 The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl <br /> tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> methanol,ethanol,ethyl dibromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance <br /> with EPA Method 8260B <br /> i <br /> 3.0. FINDINGS <br /> Ground water flow direction, elevation, and gradient were determined from data collected in the <br /> field,The hydrocarbon impact to ground water was quantified by the laboratory data obtained from <br /> the ground water samples <br /> 1 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> ' For the March 2002 sampling event, depths to ground water ranged from 13 79 feet to 14 62 feet <br /> below the tops of the well casings Ground water elevations at the site ranged from 4 18 feet to 5 53 <br /> feet below mean sea level(MSL) Ground water was within the screened interval of MW-2 through <br /> MW-6, ground water was approximately 0 5 feet above the screened Interval of MW-1 <br /> The ground water flow direction was determined by plotting and contouring the ground water <br /> elevation data The shape of the water table at the time of the March 2002 monitoring event was in <br /> the form of a northwest-plunging trough, ground water at the site was determined to be flowing to <br /> the north-northwest under an average gradient of 0 030 fl/ft Figure 3 illustrates the contoured ground <br /> water elevations as measured on 14 March 2002 <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> 10 TPH-g was detected in the water samples collected from monitoring wells MW-1 and MW-2 at <br /> concentrations of 11,000 micrograms per liter (µgd) and 580 gg/l, respectively <br />' Advanced GeoFnvironmental,Inc <br /> 1 <br />