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07 January 2002 <br /> AGE-NC Project No. 98-0440 „ <br />' Page 2 of 4 <br /> 2.2.• COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using a new disposable plastic bailer. <br /> Additionally, a water sample was collected from,domestic well DW5157 after the-well purge valve -� <br />' was opened and water was allowed to run for more than'l 5 minutes, allowing the pump'to turn on. <br /> Each water sample was transferred into one 1-liter amber bottle without sample preservative and into <br /> three 40-m1 VOA vials containing 0.5 ml 18%-hydrochloric acid as a sample preservative. After. <br />' collection, the samples were properly labeled, placed in a chilled container and transported-under <br /> chain-of-custody to McCampbell Analytical,Inc.(MAI),a California Department of Health Services <br />' (DHS)-certified analytical laboratory in Pacheco, California. Each sample was analyzed for: <br /> Total.petroleum hydrocarbons quantified, 'as-gasoline and' diesel (TPH-g and TPH-d, <br />' respectively) by EPA Methods 8015M/5030/3550; ' <br /> • Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-tertiary butyl ether(MTBE) . <br />' by EPA Method 8020; ; <br /> • Fuel additives - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether(TAME),tertiary butanol(TBA), ethylene dibromide(EDB)and <br />'. 1,2-dichloroethane (1,2-DCA)in accordance with'EPA Method 8260M <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction,and gradient were'determined from-field.data collected on <br /> 07.December 2001;. the contaminant.impact to ground water was quantified by the laboratory <br /> analytical data. <br /> 3.1. GROUND WATER GRADIENT'AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1). N ", <br /> Depthsto'ground water ranged from 12.82'feet to 1340 feet below the well-casing tops. Ground- <br /> water <br /> round-water elevations at the site ranged from 2690 feet above mean sea level (MSL)-in-well MW3 to _ <br /> 27.64 feet above MSL in well MW 1'. Ground water elevations at the site decreased,an average of <br /> 2.09-feet between the September 2001 and December 2001 sampling events. Ground water levels <br /> were within the screened intervals of all the monitoring wells on-site. <br /> _ L Advanced GeoEnvironmental,Inc. <br />