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16 October 2013 <br /> AGE Project No. 99-0682 <br /> Page 3 of 5 <br /> samples collected from wells MW-7, MW8, and MW-11 at concentrations ranging <br /> between 10 pg/1 (MW-7) and 52,,pg/I (MW-8). <br /> Figure 6 depicts the approximate lateral extent of dissolved COC within this deep <br /> water-bearing zone on-site and off-site. <br /> Water-Bearing Zone: 125 to 135 feet bsg <br /> • Depth to groundwater and groundwater elevation in well MW-1 C were 25.72 feet <br /> btoc and 12.52 feet below NAVD88, respectively (Table 1). <br /> • No analytes were reported at or above laboratory detection limits in groundwater <br /> samples analyzed from well MW-1C. <br /> Water-Bearing Zone: 140 to 150 feet bsg <br /> • Depth to groundwater and groundwater elevation in well MW-1 D were 26.12 feet <br /> btoc and 12.50 feet below NAVD88, respectively (Table 1). <br /> • Groundwater samples were not collected from well MW-1 D during the September <br /> 2013 sampling event. <br /> No additional analytes were reported at or above laboratory detection limits in groundwater <br /> samples analyzed. Analytical results of water samples collected in September 2013 are <br /> summarized in Table 2. Graphs depicting trends in depth to groundwater measurements <br /> and contaminant concentrations in the monitoring well network are included in Appendix D. <br /> The laboratory report(Cal Tech Environmental Laboratories Project No. CT214-1309111), <br /> quality assurance/quality control reports, and chain-of-custody forms are included in <br /> Appendix E. Electronic deliverable format (EDF) files and depth-to-water data will be <br /> uploaded to the State GeoTracker database. <br /> 4.0. CONCLUSIONS <br /> Based upon the results of the groundwater monitoring, AGE presents the following <br /> conclusions: <br /> • The average groundwater elevation across the monitoring well network during the <br /> September 2013 monitoring event was 12.12 feet below NAVD88, indicating an <br /> average decrease in groundwater elevation of 0._9 feet compared to the March 2013 <br /> monitoring event. A. graph depicting trends in groundwater measurements is <br /> included in Appendix D. <br /> Advanced GeoEnvironmental,Inc. <br />