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t r <br /> tMA <br /> 1 <br /> f 1 , <br /> I15 June 2004 <br /> y• AGE-NC Project No 98-0465 <br />' Page 3 of 4 <br /> The relative ground water elevation at the site increased an average of 111 feet between the January <br />' 2004 and April 2004 monitoring events <br /> Wells MW1 through MW4, and wells MW2 through MW4, MW6 and MW7 on the adjacent site, <br />' were used to infer ground water flow direction and gradient The ground water flow direction was <br /> inferred to be northernly at the former UST location to northwest in the northwestern portion of the <br />' site The hydraulic gradient was determined to be 0 002 feet/feet or less Figure 3 illustrates the <br /> contoured ground water elevations as measured on 15 April 2004 <br />' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> f <br /> TPH-d and BTEX were not detected at concentrations at or above the laboratory reporting limits in <br /> any of the ground water samples TPH-g was detected in ground water samples collected from MW 1 <br /> at concentrations of 400 µg/1 This is the fourth consecutive monitoring event that TPH-g was <br />' detected in MW 1 <br /> MTBE was detected in samples collected from MWI and MW3 at concentrations of 390 µg/1 and <br /> 9 8 µg/1, respectively No other fuel oxygenated compounds were detected in the ground water <br /> analyses at or above laboratory detection limits <br /> Analytical results of water samples collected during April 2004 are summarized on Table 2 The <br /> laboratory report(CTEL Lab Project Number CT214-0404126),QA/QC report and chain-of-custody <br /> form are included in Appendix C <br />' <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> f, <br /> Based on the findings from this investigation, AGE concludes <br /> 1 w , � The ground water elevations on-site ranged from 6 93 to 7 OS feet below MSL Ground water <br /> flow was inferred to range between the north and northwest under a gradient of 0 002 <br /> feet/feet or less <br /> • TPH-d and BTEX were not detected in the ground water samples collected and analyzed <br /> during the second quarter 2004 <br /> • TPH-g was detected in ground water samples collected from MW1, at a concentration of <br /> 400 µg/l, for the fourth consecutive monitoring event Historically, TPH-g has not been <br />' detected above laboratory reporting limits in monitoring wells MW 1 through MW4 <br /> Advanced CeoEnwronmental,Inc <br /> Y _ <br />