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' 10 August 2005 <br /> . AGE-NC Project No. 97-0301 <br /> ' Page 4of6 <br /> 3.2. LABORATORY RESULTS Of GROUND WATER SAMPLES <br /> A total of twenty sSx (22) ground water samples were submitted to CTEL for analysis. <br /> TPH-g was detected from wells MW-4,MW-7 and MW-9A at concentrations of 1,400 micrograms <br /> per liter(µg11), 52,000 µg11, and 2,100 µg11,respectively. The estimated extent of dissolved TPH-g <br /> in First Water Zone is depicted on Figure 5.For the seventh consecutive quarterly monitoring event, <br /> TPH-d,TPH-k,and TPH-mo were not detected from any of the twenty-two water,samples analyzed. <br /> Various BTEX constituents were detected in the same water samples(MW-4,MW-7 and MW-9A) <br /> at concentrations as high as 35,000 gg/l benzene(greatest on-site benzene concentration detected), <br /> 340 µg11 toluene, 2,900 µg11 ethylbenzene, and 7,000 µg/1 total xylenes (MW-7). <br /> 1,2-DCA was detected from wells MW-7,MW-9A,MW-10A,MW-1 OB,MW-1 OC and MW-12C, <br /> at concentrations ranging from 5.1�tgll(MW-12C)to 220 µtg11(MW-7). TAME was detected in the <br /> water samples from wells MW-7 and MW-9A at concentrations of 13 µg11 and 3.6 gg/l,respectively. <br /> r fuel components were detected in the round water samples.Previous and current analytical <br /> No oche p g p <br /> results of ground water monitoring well samples are summarized in Tables 3 and 4. The laboratory. <br /> ' . report (CTEL Laboratory I.D. CT214-0503147) and chain of custody forms are presented in <br /> Appendix B; GeoTracker confirmation pages of the submitted laboratory electronic deliverable <br /> format (EDF) files are'included in Appendix C. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> S <br /> The implications from the 1St Quarter 2005 ground water monitoring event are as follows:q W 0 <br /> • Generally, depth to ground water at the site varied between 30.82 feet and 32.f 4 feet bsg; <br /> ground water elevations ranged between 18.47 feet (MW-lOA) and 19.91 feet MW-11D) <br /> ' below MSL. <br /> Ground water flow direction for the area bound by First Water Zone wells MW-1 through <br /> MW-12 was inferred to be northeast at an approximate gradient of 0.003 ft/ft or less <br /> (Figure 4). Due to the low gradient at the site, slight variations in ground water <br /> measurements or changes of recharge/discharge of the local ground water could greatly <br /> modify ground water flow direction. <br /> ' The average ground water elevation at the site on 15 March 2005 was 19.24 feet below MSL. <br /> Generally, ground water elevation at the site increased an average 3.79 feet between the <br /> ' December 2004 and the March 2005 ground water monitoring events.The increase in ground <br /> water elevation is probably due to seasonal fluctuation. <br /> Advanced GeoEnrironmental,Inc. <br /> I ' <br /> I <br />