ARCHIVED REPORTS XR0007815 - Laserfiche WebLink

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. 15 Apri12004 ' AGE-NC Project No 95-0142 IPage 2 of 4 The water was then transferred into EPA-approved 40-milliliter(ml)volatile organic analysis(VOA) ' vials containing 0 5 ml hydrochloric acid(18%)as a sample preservative The vials were labeled and placed in a chilled container for subsequent transport under chain-of custody ,to McCampbell ' Analytical, Inc (MAI), a State of California Department of Health Services (DHS) certified laboratory Ground water samples were analyzed for the following ' Total petroleum hydrocarbons as gasoline (TPH-g) in accordance with EPA Method 8015- Modified, and • Benzene,toluene, ethylbenzene and total xylenes(BTEX)and the oxygenated fuel additives ' methyl tertiary-butyl ether (MTBE), d>-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE),tertiary-amyl methyl ether(TAME)and tertiary butanol (TBA),methanol, ethanol, ethylene d>bromide (EDB) and 1,2-d;ichloroethane (1,2-DCA) in accordance with EPA ' Method 8260B, respectively ' 3.0 FINDINGS ' • Ground water elevation, flow direction and gradient were determined from field data collected in February 2004 The contaminant impact to ground water was quantified by the ground water ' laboratory data 3 1 GROUND WATER GRADIENT AND DIRECTION Depth to ground water at the site ranged between 29 20 feet and 30 27 feet below the tops of the- monitoring well casings The ground water elevation in the wells ranged from 16 76 feet (MW-1) to 17 55 feet (MW-3)below mean sea level (MSL) The average ground water elevation increased 0 1 feet since the previous monitoring event Ground water elevation data from extractions wells ' were not utilized, due to the modified of the casing elevations caused by development of the remediation system on the site The elevation and'ground water depth data is depicted in Table 1 ' During this monitoring event, the general ground water flow direction in the ground water monitoring wells surrounding the former UST release was towards the north to northwest at an average hydraulic gradient of 0 014 ft/ft The elevation of the ground water table at the site is ' illustrated on Figure 3 tAdvanced GeoEnvironmental Inc