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' 22 February 2005 <br /> AGE-NC Project No 01-0839 <br />' Page 2 of 4 <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 <br /> Department of Health Services-certified analytical laboratory, for analysis The samples were <br />' analyzed for <br /> • Total petroleum hydrocarbons as gasoline (TPH-g) in accordance with EPA Method <br />' 8015M, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), di-isopropyl ether (DIPS), <br /> ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl <br />' methyl ether(TAME), tertiary-butyl alcohol (TBA), ethylene dlbromide (EDB), and <br /> 1,2 dichloroethane (1,2-DCA) by EPA Method 8260B <br /> 3.0. FINDINGS <br />' The ground water elevation, flow direction, and gradient were determined from field data The <br /> contaminant Impact to ground water was quantified by the laboratory analytical data <br /> 1. <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the <br /> sampling August 2004event, depths to ground water ranged from 73 82 feet to <br /> g <br /> 74 12 feet below the tops of the well casings (Table 1) Ground water elevations at the site <br />' ranged from 40 20 feet (MW-3) to 40 29 feet (MW-1) below mean sea level (MSL) During this <br /> monitoring event, the ground water level was within the screened Interval of the wells, Indicating <br />' that the wells were properly screened to yield representative shallow ground water samples <br /> The ground water flow direction was calculated from the well elevation data The net ground <br />' water flow direction was Inferred to be towards the north to northeast at the former UST <br /> excavation at a gradient of approximately 0 002 foot per foot (ft/ft) (Figure 3) <br /> 1 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected In the water samples collected from well MW-3 at a concentration of <br /> 9,500 micrograms per liter (}tg/1) <br />' MTBE was detected In the water samples collected from wells MW-3 and MW-4 at <br /> concentrations of 9,500 pg/l and 21 µg/l, respectively <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />