Laserfiche WebLink
I t <br />' 10 May 1999 <br /> • AGE-NC Project No 95-0111 <br />' Page 5 of 6 <br />' obtained from previous quarterly monitoring events conducted <br /> The ground water gradient was approximately 0 0049 ft/ft or 25 8 feet per mile, over the distance <br />' from the up gradient well (MW-3) to the north edge of Grant Line Road (MW-6) The relative <br /> ground water elevation isocontours are depicted in Figure 3 <br />' 3 4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in samples collected from morntonng wells MW-1, MW-2, MW-4 and MW-5 <br /> at concentrations of 95 micrograms per liter(µg/1), 76 µg/1, 220 µg/] and 61 µg/1, respectively <br />' TPH-d was detected in samples from wells MW-4, MW-5 and MW-7 at concentrations of 360,000 <br /> µg/l, 13,000µg11 and 120µg/1,respectively The concentration from well MW-4 is high on the range <br /> of TPH-d concentrations detected in ground water samples collected from this well during previous <br />' ground water monitoring events Laboratory notations for the ground water sample collected from <br /> wells MW-4 and MW-5 indicated the presence of an immiscible sheen <br /> lie Benzene was detected in samples collected from wells MW-1, MW-2 and MW-4 at concentrations <br /> of 20µg/l, 0 85 µg/1 and 2 3 ug/l, respectively Ethylbenzene was detected in MW-1 and MW-2 at <br />' concentrations as high as 3 5 µg/l Xylenes were detected in samples from MW-1 and MW-2 at <br /> concentrations as high as 4 9 µg/l <br />' MTBE was detected by EPA Method 8260 Modified in samples collected from wells MW-1,MW-4, <br /> MW-5 and MW-7 at concentrations of 190µg/l, 110 µg/l, 52 µg/1 and 38 µg/1, respectively <br />' Analytical results of ground water samples are summarized in Table 2 and Table 3 The laboratory <br /> report(MAI Laboratory Sample No 08248 to 08255), quality assurance and quality control report <br /> and chain-of-custody form are included in Appendix E <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' Based upon data collected from the site during the current and precedingground water monitoring <br />' events, AGE concludes <br /> • The ground water flow direction inferred from data collected during this monitoring event <br /> is consistent with ground water flow directions determined during past events at the site <br /> . • The concentrations of TPH-g and BTEX detected in the ground water samples remain at the <br />' Advanced GeoEnWronmentai Inc. <br /> I <br />