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09 March 2006 <br /> f . AGE-NC Project No. 97-0360 <br /> _ Page 2 of 4 <br /> removed from well EW-1. Ground water temperature, pH, and conductivity were measured for <br /> stabilization at regular intervals during purging using an Oakton water analyzer.Purged groundwater <br /> was containerized in properly labeled, Department of Transportation (DOT)-approved 55-gallon <br /> drums and stored on-site pending proper disposal.Field sheets and data are included in Appendix C. <br /> 2.3. COLLECTION OF GROUND WATER SAMPLES <br /> Ground water samples were collected from purged wells MW-1 through MW-5 and EW-1 using <br /> dedicated disposable plastic bailers after allowing all wells to achieve a minimum 80%recovery of <br /> the pre-purge water volume.Each water sample was transferred into three 40-milliliter(ml)volatile <br /> organic analysis (VOA) vials containing 0.5 ml 18% hydrochloric acid solution as a sample <br /> r.;I -liter amber bottle without preservative. After collection the samples and into one 1 <br /> _= were properly labeled,placed in a chilled container, and transported under chain of custody to Cal <br /> Tech Environmental Laboratories (CTEL), a California Department of Health Services <br /> (DHS)-certified analytical laboratory. The 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 fuel additives methyl tertiary- <br /> butyl ether (MTBE), di-isopropyl ether(DIPS), 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 /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 25 November 2005. The hydrocarbon-impact to ground water was quantified from laboratory <br /> ;.� analysis of the ground water samples. <br /> j : <br /> 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> f At the time of the November 2005 sampling event,depths to ground water in wells MW-1 through <br /> MW-5 and EW-1 ranged from 10.20 feet (EW-1) to 11.78 feet (MW-2) below the well heads <br /> Average ground water elevation at the site (excluding MW-2) was approximately 0.92 feet above <br /> i mean sea level(MSL;Table 1).Ground water elevations at the site decreased an average of 3.07 feet <br /> since the September 2005 monitoring event. <br /> Advanced GeoEnvironmental,Inc. <br /> i__J <br />