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' 20 December 2004 <br /> AGE-NC Project No 98-0511 <br /> Page 2 of 4 <br /> during the purge process using an Oakton water analyzer Field data sheets are included in <br /> Appendix B Purged water was stored on-site in properly labeled, Department of Transportation <br /> (DOT)-approved 55-gallon drums <br /> Following purging, the depth to ground water was re-measured to ensure that a minimum of 80% <br /> well-volume recharge had been achieved prior to sampling <br /> 2 2 2 Collection and Analysis of Ground Water Samples <br /> IWater samples were collected from each purged well using the dedicated disposable plastic bailer <br /> Each water sample was transferred Into three laboratory-supplied,40-milliliter(ml)volatile organic <br /> analysts (VOA) vials containing 0 5 ml 18% hydrochloric acid solution 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), a California Department <br /> of Health Services (DHS)-certified laboratory, and analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M, <br /> • Benzene,toluene, ethylbenzene, and total xylenes(BTEX)in accordance with EPA Method <br /> 8260B, and <br /> • Fuel additives di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE),methyl tertiary- <br /> butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), <br /> ethylene dibromide (EDB), 1,2-dl chloro ethane (1,2-DCA), ethanol, and methanol in <br /> accordance with EPA Method 8260B <br /> I <br />' 3.0. FINDINGS <br /> Ground water elevation and flow direction were determined from field data Hydrocarbon-impact <br /> to ground water was inferred from laboratory analysis of ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> For the September 2004 ground water monitoring event, the elevation of ground water in each well <br /> was calculated by subtracting the depth to ground water from the surveyed casing elevation <br /> . (Table 1) Depths to ground water ranged from 19 00 feet to 19 95 feet below the tops of the well <br /> casings Ground water elevations at the site ranged from 143 feet below mean sea level (MSL) in <br /> Advanced GeoEnwronmental,Inc <br />