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! 18 May 2005 <br /> AGE-NC Project No 03-1100 <br />' Page 3 of 4 - <br /> MW-7 to 24 62 feet below MSL in well MW-4 (Table 1) The ground water elevation at the site <br /> increased an average of 2 07 feet between the November 2004 and February 2005 monitoring events <br />' The'ground water flow direction was inferred to be flowing towards the east in the former UST <br /> location at a calculated hydraulic gradient of 0 006 foot per foot (ft/ft) Figure 3 Illustrates the <br /> contoured ground water elevations as measured on 07 February 2005 <br /> 1 _ <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the ground water sample collected from well MW-2 at a concentration of <br /> 200,000 micrograms per liter (µg/1) BTEX compounds were detected in the ground water sample <br />' collected from well MW-2 at a concentration of 2,500 µg/1 (benzene), 12,000 µg11 (toluene), <br /> 3,900 µg/1 (ethylbenzene), and 22,900 µg/l (total xylenes) <br />' 1,2-DCA was detected in ground water samples collected from wells MW-2 and MW-3 at <br /> concentrations of 43 µg/1 and 29 µg/1, respectively EDB was detected in the ground water sample <br /> collected from well MW-1 at a concentration of 19 µg/1 <br /> No other constituents of concern were detected in the ground water analyses at or above laboratory <br /> detection limits Analytical results of water samples collected in February 2005 are summarized in <br /> Table 2 The laboratory report (CTEL Project No CT214-05012036), quality assurance/quality <br /> control (QA/QC) report, and chain of custody form are included in Appendix C GeoTracker <br />' confirmation pages of the submitted ground water monitoring electronic deliverable format(EDF) <br /> files are included in Appendix D <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> J t <br /> Based on the findings from this investigation, AGE concludes <br /> -- - •-- The ground water elevation on-site ranged-from 24 14-to 24 68 feet below-MSL Ground - - <br />' water flow was inferred to be flowing inward towards the east in the former UST location <br /> under a gradient of 0 006 ft/ft <br /> • TPH-g was detected in the ground water sample collected from well MW-2 at a <br /> concentration of 200,000 µg/1 <br /> t 1,2-DCA was detected in ground water samples collected from wells MW-2 and MW-3 at <br /> concentrations of 43 µg/1 and 29 µg/1, respectively <br /> • The lateral extent of TPH-g impacted,ground water has been defined in all directions with <br /> Advanced GcoEnvironmentai,Inc <br /> 1 , <br />