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23 March 2005 <br /> AGE-NC Project No. 97-0360 <br /> Page 2 of 4 <br /> without preservative. After collection, the samples were properly labeled, placed in a chilled <br /> j container,and transported under chain of custody to Cal Tech Environmental Laboratories(CTEL), <br /> a California Department of Health Services(DHS)-certified analytical laboratory.The samples were <br /> 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 fuel additives methyl tertiary- <br /> butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary- <br /> 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 8260B. <br /> 3.0. FINDINGS <br /> i <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 13 October 2004.The hydrocarbon-impact to ground water was quantified from laboratory analysis <br /> V1of the ground water samples. <br /> 1 <br /> 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the October 2004 sampling event, depths to ground water in wells MW-1 through <br /> MW-5 and EW-1 ranged from 8.25 feet (EW 1) to 10.10 feet (MW-2) below the well heads. <br /> Average ground water elevation at the site (excluding MW-2 and EW-1)was approximately 2.87 <br /> ___ feet above mean 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 /> because 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 /> Ground water flow was�eedl�o be generally flowing in a trough, trending south, with limbs <br /> -1 flowing soh �ands so west at gradients of approximately 0.002 foot/foot(ft/ft).Figure 3 <br /> illustrates the contoured ground water elevations as measured on 13 October 2004. <br /> V-A\ t o� <br /> H <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> No analytes were detected at or above laboratory reporting limits in any of the ground water samples <br /> _i Advanced GeoEnvironmental,Inc. <br />