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1 15 June 2004 <br /> AGE-NC Project No 98-0465 <br />' Page 3 of 4 <br />' The relative ground water elevation at the site Increased an average of 1 88 feet between the October <br /> 2003 and January 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 January 2004 <br />' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> f f <br />' TPH-d and BTEX were not detected at concentrations at or above the laboratory reporting limits in <br /> any of the groundwater samples TPH-g was detected in groundwater samples collected from MW 1 <br /> at concentrations of 570µg11 This Is the third consecutive monitoring event that TPH-g was detected <br />' in MW 1 <br /> Ile MTBE was detected in samples collected from MW1 and MW3 at concentrations of 570 µg/1 and <br /> 8 8 µg/l, 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 January 2004 are summarized on Table 2 The ` <br /> laboratory report(CTEL Lab Project Number CT214-0401088),QA/QC report and chain-of-custody <br />' form are Included In Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> 1 r <br /> Based on the findings from this Investigation, AGE concludes <br />' 0 The ground water elevations on-site ranged from 8 02 to 8 18 feet below MSL Ground <br /> wafter 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 first quarter 2004 <br /> 1 <br /> • TPH-g was detected in ground water samples collected from MW1, at a concentration of <br /> 570 µg/l This is the third consecutive quarter TPH-g has been detected In samples collected <br />' from MW1 Historically, TPH-g has not been detected above laboratory reporting limits in <br /> . monitoring wells MW 1 through MW4 The appearance of TPH at the same or similar <br /> Advanced CeoEnvironmental,Inc <br /> 1 1 <br />