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i <br /> I30 June 2004 , <br /> AGE-NC Project No 98-0433 <br />' Page 3 of 5 1 <br />' 3.0. FINDINGS <br /> Ground water elevations were determined by subtracting the measured depths-to-water from the <br />' surveyed casing elevations Ground water flow directions weredet rmlrlqrbycontouring the water <br /> elevations on a scaled site plan (Figure 3) The impact of th homed release n ground water <br /> was quantified by laboratory analysis of the samples collected <br /> I <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Depth to ground water in wells ranged from 24 96 to 26 64 feet below well casing tops The ground <br /> water elevations at the site ranged from 32 04 feet (MW-3) to 32 51 feet (MW-6) above mean sea <br /> level (msl) The data Indicates an average ground water elevation Increase of 124 feet in the wells <br /> since the November 2003 monitoring event Depth to ground water and calculated elevation data are <br /> presented in Table 1 1 <br /> The ground water in the area of the Lube Bay/Truck Wash flows towards the northwest at a gradient <br />� . of approximately 0 001 ft/ft At the northern edge of the site, the gradient is determined to be <br /> towards the northwest with a hydraulic gradient of approximately 0 00004 ft/ft (Figure 3) <br /> I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES 4 <br /> i <br /> I TPH-g was detected in the ground water samples collected from MW-1, MW-6, MW-8 and MW-9 <br /> at concentrations as high as 7,300 micrograms per liter(µg/1) in MW-6 TPH-d was gtected in the <br /> ground water samples collected from wells MW-1 and MW-6 at concentrations omilligram per <br /> liter(mg/1) and 6 mg/l, respectively <br /> One or more BTEX compounds were detected in samples MW-1 and MW-6 The maximum <br /> concentrations included 17 µg/1 of benzene in MW-6, 10 µg/1 of ethylbenzene and 7 8 µg/1 of <br /> xylenes in MW-1 f <br /> IMTBE was detected by EPA Method 8260B in samples MW-1,MW-8 and MW-9 at concentrations <br /> of 1,400 µg/1, 170 µg/1 and 2,200 µg/1,respectively rTAME was detected in samples MW-1,MW-8 <br /> and MW-9 at 79 gg/l, 20 gg/l, and 26 gg/l, respectively f <br /> No other target anal es were detected at or above laboratory reporting limits in an of the ground <br /> g Yt rY p g Y <br /> Iwater samples collected from the monitoring wells or on-site domestic well (DW-1) <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />