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16 February 2005 <br /> 1• AGE-NC Project No 98-0465 <br /> _ Page 3 of 4 1 <br /> t <br /> Figure 3 illustrates the contoured ground water elevations as measured on 15 October 2004 The <br /> relative ground water elevation at the site decreased an average of 129 feet between the July and <br /> October 2004 monitoring events <br /> r <br /> � <br /> Wells MW-1 through MW-4,and wells MW-2 through MW-4, MW-6, and MW-7 on the adjacent <br /> site were used to model ground water flow direction and calculate gradient The ground water flow <br /> direction was inferred to be northerly at the former UST location and to southeast in the northwestern <br /> portion of the site The hydraulic gradient was determined to be 0 02 feet/feet (ft/ft) at the the <br /> adjacent site (Sanchez Property) and 0 006 ft/fl or less at the UST loaction Figure 3 illustrates the <br /> contoured ground water elevations as measured on 15 October 2004 <br />' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-d and BTEX compounds were not detected at concentrations at or above the laboratory <br />' reporting limits in any of the ground water samples TPH-g was detected in ground water samples <br /> collected from MW-1 at a concentration of 800 micrograms per liter (µg/1) This is the sixth <br /> consecutive monitoring event that TPH-g was detected in MW <br />' • MTBE was detected in samples collected from MW-1 and MW-3 at concentrations of 770 µg/1 and <br /> 14 µg/l, respectively No other fuel oxygenated compounds were detected in the ground water <br />' analysis at or above laboratory detection limits <br /> Analytical results of ground water samples are summarized in Table 2 The laboratory report(CTEL <br /> Project No CT214-0410093), quality assurance/quality control report, and chain of custody forms <br /> are included in Appendix C Documents confirming the upload of laboratory electronic deliverable <br /> format(EDF) files and depth to water measurements to GeoTracker are included in Appendix D <br /> 1 <br /> If , <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> r <br /> Based on data collected at the site, AGE concludes ' <br /> • The ground water elevations on-site ranged from 9 91 to 10 07 feet below MSL Ground <br /> water flow was inferred to be towards the north under a gradient of 0 006 ft/ft or less <br />' TPH-d and BTEX were not detected in the ground water samples collected and analyzed <br /> during the fourth quarter 2004 <br />' TPH-g was detected in ground water samples collected from MW-1 at a concentration of <br /> • 800 µg/l, for the fifth consecutive monitoring event Historically, TPH-g has not been <br /> Advanced GeoEnv►ronmental,Inc <br /> 1 y 1 <br />