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' 26 August 2004 <br /> • AGE-NC Project No. 98-0520 <br /> Page 3 of 4 <br /> flow was toward the northwest under an average gradient of 0.002 foot/foot. Figure 3 illustrates the <br />' contoured ground watenelevations as measured on 22 March 2004. <br />' 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ' TPH-g was detected in the water samples collected from wells MW-I, MW-2, MW-3 and MW-5 <br /> at concentrations ranging from 220 micrograms per-liter (pg/l) (MW-1) to 1,800 µg/l (MW-2). <br /> Figure 4 illustrates the approximate distribution of dissolved TPH-g. <br /> 1 Ethylbenzene was detected in sample MW-5,at a concentration of 10!ag/1.Benzene was not detected <br /> at or above laboratory reporting limits in any of the ground water samples. <br />' No other analytes were detected at or above laboratory reporting limits in the ground water samples <br /> collected. Analytical results of ground water samples are summarized in Table 2. The laboratory <br /> report(CTEL Project No. CT214-0403170)and chain of custody forms are included in Appendix D. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon.data collected from the site, AGE concludes: <br /> • On 22 March 2004 the ground water elevation at the site averaged approximately 13.99 feet <br /> above MSL,which represents an elevation increase of approximately 1.08,feet since the last <br /> r monitoring event. Net ground water flow was toward the northwest at an average gradient <br /> of 0.002 foot/foot. <br />' •. The ground water flow direction has been consistently northwest since the initiation of <br /> ground water monitoring in December'1999; however, the ground water gradient is very <br /> shallow and seasonal changes can greatly influence the direction and pattern of ground water <br /> ' flow. <br /> •' TPH-g concentrations increased this quarter in wells MW-1, MW-2, MW-3 and MW-5. <br /> ' Ethylbenzene was detected in MW-5; the concentration was below the DHS Maximum <br /> Coniaminant Levels (MCLS) for drinking water. <br /> The vertical extent of impacted groundwater has been defined;TPH-g has not been detected <br /> ' in deep-screened well MW-6 since the well was installed in December 2001. Impacted <br /> ground water apparently does not extend beyond 45 feet bsg. <br /> Advanced Geo Environmental,Inc. <br /> 1 <br />