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15 i 1 30 April 2005 AGE-NC Project No 98-0465 Page 3 of 4 I 1 ` Figure 3 Illustrates the contoured ground water elevations as measured on 14 January 2005 The relative ground water elevation at the site Increased an average of 3 07 feet between the October 2004 and January 2005 monitoring events Wells MW-1 through MW-4, and wells MW-2 through MW-7 on the adjacent site were used to model ground water flow direction and calculate the gradient The ground water flow direction was Inferred towards the northwest at the former UST location and to the southeast in the northwestern portion of the site The hydraulic gradient was determined to be 0 035 feet/feet (ft/ft) at the northwestern property boundary (1856 Country Club Boulevard) and 0 003 ft/ft or less at the UST loaction Figure 3 Illustrates the contoured ground water elevations as measured on 14 January 2005 I r I ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-d and BTEX compounds were not detected at concentrations at or above the laboratory reporting limits in any of the ground water samples TPH-g was detected in the ground water sample collected from MW-1 at a concentration of 950 micrograms per liter 4µg/l) �. MTBE was detected in samples collected from MW-1 and MW-3 at concentrations of 940 Vg/1 and 52 gg/l, respectively No other fuel oxygenated compounds were detected In the ground water ' analysis at or above laboratory detection limits Analytical results of ground water samples are summarized In Table 2 The laboratory report(CTEL Project No CT214-0501073), quality assurance/quality control report, and chain of custody forrhs are included in Appendix C Documents confirming the upload of laboratory electronic deliverable format (EDF)files and depth to,water measurements to GeoTracker are included in Appendix D 4.0. SUMMARY AND CONCLUSIONS i ' Basedon data collected at the site, AGE concludes 1 ' The ground water elevations on-site ranged from 6 84 to 7 01 feet below MSL Ground water flow at the UST location was Inferred to be towards the northwest under a gradient of 0 003 ft/ft or less ' TPH-d and BTEX were not detected in the ground water samples collected and analyzed during the first quarter 2005 ' • After twelve consecutive quarters (second quarter 2000 to second quarter 2003) of non- detect, TPH-g was detected in the ground water sample collected from well MW-1 for the seventh consecutive monitoring event, at a concentration of 950 µg/1 Historically, TPH-g ' N Advanced GeoEnvironmentsl,Inc J 1 I I