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r. ' 17 May 2002 AGE-NC Project No 99-05 84 ' Page 3 of 4 ' The ground water flow direction and gradient were determined from the groundwater elevation data Contours of the ground water elevation data indicates that the ground water flow was directed toward the northeast, at a gradient of approximately 0 0028, or 14 78 feet/mile Figure 3 illustrates the ' contoured ground water elevations I32 ANALYTICAL RESULTS OF WATER SAMPLES TPH-g was detected in ground water sample collected from well MW-1 at a reported concentration of 100 micrograms per liter(µg/1) MTBE was detected in the ground water samples collected from well MW-1 at a reported concentrations of 16µg/l Benzene,ethylbenzene and total xylene were also detected in the same sample at concentrations of 2 7 µg/l, 0 92 µg/1 and 3 4 µg/l, respectively There were no other reported detections of BTEX, TPH-g, DIPE, ETRE, TAME, TBA, ethanol, methanol or lead scavengers in any of the ground water samples analyzed Analytical results from ground water samples are summarized in Table 2 The laboratory reports ' • (MAI Laboratory ID 0203031-001 to 005,quality assurance and quality control(QA/QC)reports and chain-of-custody forms are included in Appendix B ' 4.0. SUMMARY AND CONCLUSIONS Based upon data collected from the site, AGE concludes • The ground water flow direction 1n March 2002 at the site was toward the northeast • TPH-g was detected for the first time since initiation of the monitoring program, in the ground water sample collected from monitoring well MW-1 at a concentration of 100 µg/1 I The BTEX compounds benzene (2 7 µg/1), ethylbenzene (0 92 µg/1) and xylenes (3 4 gg/1) were also detected for the first time in the same sample • MTBE was detected 1n the MW-1 sample at 16 µg/1, this concentration is a noticeable increase from the previous two quarters of between 4 to 5 µg/1 _ • During the ground water monitoring program(February 2000 to March 200 1)there were no reported detections of BTEX,TPH-g,MTBE,DIPS,ETBE,TAME,TBA,ethanol,methanol or other fuel additives in the ground water samples from MW-2 through MW-5,TPH-d was detected one time in MW-3 (77 µg/1 in 13 November 2000) and MW-5 (110 µg/l in 12 March 2001) • I I