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08 July 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%hydrochloric 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 /> ' 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 8260 Modified <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 May 2002 sampling event depths to ground water ranged from 13 94 feet to 14 69 feet below <br /> ' the tops of the well casings Ground water elevations at the site ranged from 4 29 feet (MW-5) to <br /> 5 70 feet (MW-4)below mean sea level (MSL) Ground water was within the screened Interval of <br /> MW-2 through MW-6,ground water was approximately 0 5 feet above the screened interval of MW- <br /> 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 May 2002 monitoring event was in the <br /> form of a northwest-plunging trough, ground water at the site was determined to be flowing to the <br /> north-northwest under an average gradient of 0 02 ft/ft Figure 3 illustrates the contoured ground <br />' water elevations as measured on 31 May 2002 <br />' Advanced CeoEnvironmental,Inc <br />