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04 March 2005 <br /> AGE-NC Project No. 98-0520 <br /> Page 2 of 4 <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), a State of California <br /> Department of Health Services(DHS)-certified analytical laboratory,for analysis.The samples were ' <br /> analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M; and <br /> • Benzene, toluene, ethyl-benzene, and xylenes (BTEX) and fuel additives methyl tertiary- <br /> butyl ether (MTBE),tertiary butanol (TBA), di-isopropyl ether(DIPS), ethyl tertiary-butyl' <br /> ' ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and <br /> 1,2-dibromoethane (EDB) in accordance with EPA Method 8260B. <br /> 3.0. FINDINGS <br /> ' flow direction were determined from field data collected on <br /> Ground water elevation and o <br /> 21 December 2004. Hydrocarbon-impact to ground water was quantified from laboratory analysis <br /> of the ground water samples. <br /> ' 3.1. GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water. <br /> from the surveyed casing elevations (Table 1). Depths to ground water ranged from 20.98 feet <br /> (MW-7)to 22.10 feet(MW-2)below the tops of the well casings.Ground water elevation at the site, <br /> not including MW-6, averaged approximately 15 feet above mean sea level (MSL), showing an <br /> elevation increase of approximately 4.8 feet since the September 2004 monitoring event. <br /> The ground water flow direction was determined using ground water elevation data from water table <br /> ' -wells MW-I through MW-5 and MW-7 through MW-10; elevation data from well MW-6 was not <br /> utilized because the well is deep-screened.The ground water table at the time of the December 2004 <br /> ' monitoring event was inferred to be flowing toward the northwest under a shallow gradient of <br /> approximately 0.001 foot/foot (ft/ft). Figure 3 illustrates the contoured ground water elevations as <br /> measured on 21 December 2004. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ' r TPH-g was detected in the ground water samples collected from wells MW-2 and MW-5 at <br /> ' Advanced GcoEnvironmental,Inc. <br />