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I 01 October 2013 <br />AGE Project No. 99-0559 <br />Page 4 of 6 <br />(MW-6C). Groundwater elevations ranged between 30.15 feet (MW-5C) and <br />30.22 feet (MW-7C) below NAVD88 indicating an average decrease of 6.28 feet <br />since the previous monitoring event in March 2012. Groundwater was inferred to be <br />flowing toward the east-northeast at a gradient of 0.0004 ft/ft (Figure 5). <br />Depths to groundwater ranged from 55.09 feet btoc (MW-5D) to 55.80 feet btoc <br />(MW-6D). Groundwater elevations ranged between 30.40 feet (MW-6D) and 30.62 <br />feet (MW-7D) below NAVD88 indicating an average decrease of 6.33 feet since the <br />previous monitoring event in March 2012. Groundwater was inferred to be flowing <br />toward the north at a gradient of 0.003 ft/ft on-site (Figure 6). <br />Groundwater samples were not collected from HU5 wells during the September <br />2013 sampling event. <br />HU6: <br />Depths to groundwater ranged between 55.90 feet btoc (MW-5E) and 56.80 feet <br />btoc (MW-6E, MW-7E, and MW-9). Groundwater elevations ranged between 31.25 <br />feet (MW-5E) and 31.68 feet (MW-9) below NAVD88 indicating an average <br />decrease of 6.74 feet since the previous monitoring event in March 2012. <br />Groundwater was inferred to be flowing toward the north-northeast at a gradient of <br />0.004 ft/ft on-site (Figure 7). <br />No additional analytes were reported above laboratory detection limits in the groundwater <br />samples analyzed. Analytical results of current and historical groundwater samples are <br />summarized in Table 2. The Laboratory report (CTEL Project No. CT214-1309069), quality <br />assurance and quality control (QA/QC) reports and chain of custody forms are included in <br />Appendix D. Electronic deliverable format (EDF) files and depth-to-water data were <br />uploaded to the State GeoTracker database under confirmation numbers 7955228686 and <br />9437970995. <br />4.0. CONCLUSIONS <br />Based upon the results of the groundwater monitoring, AGE presents the following <br />conclusions: <br />Groundwater elevations decreased in all HU's during the September 2013 <br />monitoring event compared to the previous monitoring events in March 2012 and <br />December 2012; average groundwater elevations decreased between 5.61 feet in <br />HU3/HU4 and 6.74 feet in HU6. <br />Advanced GeoEnvironmental, Inc.