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r 02 March 2005 <br /> AGE-NC Project No. 97-0360 <br /> Page 2 of 4 <br /> amber bottle without preservative. After colIection,:the samples were properly labeled,placed in a <br /> chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories <br /> (CTEL), a California Department of Health Services (DHS)-certified analytical laboratory. The <br /> samples were analyzed for: <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> ._.� accordance with EPA Method 8015M; and <br /> • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fael additives methyl tertiary- <br /> butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB), and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 826013. <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 20 July 2004. The hydrocarbon impact to ground water was quantified from laboratory analysis of <br /> == the ground water samples. <br /> ,,t I 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> 'I <br /> <. At the time of the July 2004 sampling event,depths to ground water in wells MW-1 through MW-5 <br /> and EW-1 ranged from 6.86 feet(EW-1)to 8.26 feet(MW-3)below the well heads.Average ground <br /> water elevation at the site (excluding MW-2 and EW-1) was approximately 4.20 feet above mean <br /> sea level (MSL; Table 1). <br /> The ground water flow direction was inferred using ground water elevation data from the monitoring <br /> wells on-site. Well MW-2 was not used to determine ground water flow direction or gradient <br /> Ibecause it is screened at a deeper interval than the other wells. Well EW-1 was not used to determine <br /> ground water flow direction or gradient because it has a larger casing diameter than the other wells. <br /> I' Ground water flow direction was inferred to be toward the northW"t and 0ieast at gradients of <br /> i ! approximately 0.002 foot/foot(ft/ft)and 0.001 ft/ft,respectively. Figure 3 illustrates the contoured <br /> groundwater elevations as measured on 20 July 2004. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples from wells MW-2 and MW-5 at concentrations of 270 micrograms <br /> Advanced GeoEnvironmental,Inc. <br /> it <br />