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16 August 2004 <br /> . AGE-NC Project No 98-0433 <br /> Page 3 of 5 <br /> I3.0. FINDINGS <br /> Ground water elevations were determined by subtracting the measured depths to water from the <br /> surveyed casing elevations Ground water flow directions were determined by contouring the water <br /> elevations on a scaled site plan(Figure 3) The impact of the unauthorized release on ground water <br /> was quantified by laboratory analysis of the samples collected <br /> 3 1 GROUND WATER GRADIENT AND FLOWN IRECTION <br /> Depth to ground water In wells ranged from 26-36-to 27 76 feet below well casing tops The ground <br /> water elevations at the site ranged from 30 22 feet (MW-6) to 3108 feet (MW-5) above mean sea - <br /> Ilevel (msl) The data indicates an average ground water elevation decrease of 135 feet in the wells <br /> since the February 2004 monitoring event Depth to ground water and calculated elevation data are <br /> presented In Table 1 <br /> In general, the ground water flow direction at the time of the Third Quarter 2004 monitoring event <br /> g �' Q g <br /> was east-southeast, at gradients ranging between 0 004 ft/ft to 0 009 ft/ft east and northeast of the <br />� . former USTs and 0 000 fl/ft west of the former USTs (Figure 3) <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected In the ground water samples collected from MW-1, MW-8 and MW-9 at <br /> concentrations as high as 2,300 micrograms per liter (µg/1) In MW-9 TPH-d was detected in the <br /> ground water samples collected from well MW-1 at a concentration of 7 2 milligram per liter(mg/1) <br /> I Of the BTEX compounds,only benzene was detected in samples MW-1 and MW-6 at concentrations <br /> of 4 1 µg/1 and 18 µg/1, respectively MTBE was detected In samples MW-1, MW-8 and MW-9 at <br /> concentrations of 1,800 µg/1, 390µg/1 and 2,300 µg/1,respectively TAME was detected in samples <br /> MW-1, MW-8 and MW-9 at 47 gg/l, 24 µg/l, and 32 µg/1, respectively _ <br /> No other target analytes were detected at or above laboratory reporting limits in any of the ground <br /> water samples collected from the monitoring wells or on-site domestic well (DW-1) <br /> Analytical results from ground water samples.are summarized In Table 1 The laboratory report <br /> (CTEL Project No CT214-0407163), quality assurance and quality control (QA/QC) and chain of <br /> custody are included In Appendix B The distribution of dissolved hydrocarbons is depicted on <br /> Figure 4 GeoTracker confirmation pages of the submitted laboratory electronic deliverable format <br />' (EDF) files are included In Appendix C <br /> Advanced GeoEnvironmental,Inc <br />