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r , <br /> I <br /> s <br /> 10 September 2001 <br />' ' AGE-NC Project No 95-0142 <br /> Page 2 of 4 <br />' 22 GROUND WATER SAMPLE COLLECTION <br /> Water samples were collected from each well using new disposable plastic bailers and transferred <br />' into EPA-approved 40-milliliter (ml) VOA vials containing 0 5 ml hydrochlonc acid (18%) as a <br /> sample preservative The vials were then labeled and placed in a chilled container for subsequent <br />' transport under chain-of-custody to McCampbell Analytical, Inc (MAI) a State of California <br /> Department of Health Services (DHS) certified laboratory Ground water samples were analyzed for <br /> the following <br />' - Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br />' - Volatile aromatic hydrocarbons- benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> in accordance with EPA Method 8020, and <br /> - Oxygenated fuel addrtives - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> methyl tertiary-butyl ether(MTBE), tertiary-amyl methyl ether(TAME) and tertiary butanol <br /> (TBA), methanol, ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in <br /> accordance with EPA Method 8260, respectively <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 15 May 2001, the contaminant impact to ground water was assessed from the ground water <br /> laboratory data <br /> 1 <br /> 3 1 GROUND WATER GRADIENT AND DIRECTION <br />' Depth to grdund.water at the site ranged from 25 31 feet to 26 55 feet below the tops of the well <br /> casings The ground water elevation in the wells ranged from 13 26 feet to 13 88 feet below mean <br />' sea level (msl) The elevation and ground water depth data is depicted 1n Table 1 <br /> During the May 2001 monitoring event, ground water flow direction in the shallow ground water <br />' table was toward the northwest with an average hydraulic gradient of 0 0125 feet/feet, away from <br /> the former UST release site The relative elevation of the ground water surface at the site is <br />' illustrated on Figure 3 <br /> J <br />