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08 December 2004 <br /> • AGE-NC Project No 98-0511 <br />' Page 4 of 6 <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were determined from field data Hydrocarbon Impact <br /> to ground water was inferred from laboratory analysis of ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> For the May 2004 ground water monitoring event, the elevation of ground water In each well was <br /> calculated by subtracting the depth to ground water from the surveyed casing elevation (Table 1) <br /> Depths to ground water ranged from 15 83 feet to 16 65 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 1 38 feet above MSL in well MW-7 to 2 0 feet above <br /> MSL in wells MW-I and MW-2 Ground water at the site was inferred to flow generally toward the <br /> west-southwest (Figure 3) under a hydraulic gradient of approximately 0 004 foot/foot (ft/fl) to <br /> 0 006 ft/fl <br /> I <br /> I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in ground water samples collected from monitoring wells MW-I and MW-5 at <br /> concentrations of 32,000 micrograms per liter (µg/1) and 170 gg/l, respectively Benzene was <br /> detected In samples MW-1 and MW-5 at concentrations of 200 µg/l and 24 µg/l, respectively <br /> Toluene, ethylbenzene, and total xylenes were detected in sample MWA at concentrations of <br /> I 130 µg/l, 530 µg/l and 2,860 µg/1, respectively Toluene was detected in sample MW-5 at a <br /> concentration of 5 2 µg/1 TPH-g and BTEX compounds were not detected In samples collected from <br /> wells MW-2 through MW-4 and MW-6 through MW-8 <br /> Utilizing EPA Method 8260B, MTBE was detected in the ground water sample collected from <br /> MW-5 at a concentration of 38 µg11 Fuel additives were not detected above laboratory reporting <br /> I limits in ground water samples collected from monitoring wells MW-1 through MW-4 and MW-6 <br /> through MW-8 <br /> I Analytical results of ground water samples are summarized in Tables 2 and 3 The Inferred lateral <br /> distributions of TPH-g and benzene are Illustrated on Figures 5 and 6, respectively Copies of the <br /> laboratory report(CTEL Project No CT214-0405150), quality assurance/quality control (QA/QC) <br /> Ireports and chain of custody forms are provided in Appendix C Documents confirming the upload <br /> of laboratory electronic deliverable format (EDF) files and depth to water measurements to <br /> GeoTracker are provided in Appendix D <br /> I <br /> Advanced GeoEnviron mental,Inc <br />