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' 15 <br /> • December 2000 <br /> AGE-NC Project No. 95-0100 <br />' Page 2 of 3 <br />' 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from the purged wells using new disposable bailers. Grab water <br />' samples were also collected from each active on-site domestic well. Water was collected from the <br /> domestic wells from the spigots on wells DW-2 and DW-3. Inactive water well DW-1 was not <br /> sampled. <br />' Each water sample was transferred into three 40-m1 volatile organic analysis (VOA) vials containing <br /> 0.5 ml 18% HCl as a sample preservative. The samples were then labeled and placed in a chilled <br />' container for transport under chain-of-custody to McCampbell Analytical, Inc. (MAI), a California <br /> Department of Health Services(DHS)-certified analytical laboratory. Each sample was analyzed for: <br /> t • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> method 8015-modified, <br />' • Volatile aromatic compounds - benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> with methyl tertiary-butyl ether (MTBE) in accordance with EPA method 8020, <br /> N • Oxygenated fuel additives - di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), <br /> MTBE, tertiary amyl methyl ether (TAME) and tertiary butyl alcohol (TBA) in accordance <br /> EPA method 8260-modified. <br /> 1 <br /> 3.0. FINDINGS <br /> Ground water flow direction and gradient were inferred from data collected in the field; ground'water <br /> levels were within the screen interval of the wells on the site. The hydrocarbon impact to ground <br /> water was quantified by the laboratory data obtained from the ground water samples. <br />' 3.1. GROUND WATER ELEVATION/FLOW DIRECTION AND GRADIENT <br />' Depth to-ground water at the site ranged from 46.23 to 47.02 feet as measured from the tops of the <br /> well casings.(Table.1). The corresponding ground water elevations ranged from 69.02 feet to 69.42 <br /> feet above mean sea level (msl). The ground water elevation decreased approximately 0.9 feet since <br /> the .previous._sampling-event of,August..2000._The ground.water,flow.directio_n this quarter was <br /> determined to be to the northwest with a hydraulic gradient of 0.003 feet/.feet (Figure 3). <br /> 1 <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />