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I . 14 January 2005 <br /> ` AGE-NC Project No 00-0769 <br />' Page 6 of 7 <br /> The fuel additive 1,2 DCA was detected at a concentration of 15 µg/1 in the sample collected from <br />' well MW-4E <br />' No other constituents of concern were detected at or above laboratory reporting limits in the water <br /> samples collected during the second quarter sampling event Analytical results of ground water <br /> samples are summarized in Tables 2 through 5 The laboratory reports(CTEL Project Nos CT214- <br />' 0405158 and CT214-0405169), quality assurance/quality control (QA/QC) reports, and chain of <br /> custody forms are provided in Appendix C Documents confirming the upload of laboratory <br /> electronic deliverable format (EDF) files and depth to water measurements to GeoTracker are <br />' included in Appendix D <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based on data collected during the May 2004 ground water monitoring event, AGE concludes <br /> Depth to ground water at the site vaned from 25 45 feet and 30 08 feet below the s of the to <br /> • p � p <br />' well casings, ground water elevation at the site ranged from 15 85 feet to 19 02 feet below <br /> MSL during the May 2004 monitoring event <br /> • HU-1 generally flowed east to southeast at 0 003 ft/ft, HU-2 generally flowed southeast at <br />' 0 001 ft/ft,HU-3 generally flowed east at 0 001 ft/ft,HU-4 flowed generally toward the north <br /> at an average gradient of 0 012 ft/ft (Figures 3 through 6) <br /> I The most highly impacted ground water appears to be located near the former USTs <br /> Vertically, hydrocarbon-impacted ground water was detected in each of the screened <br /> intervals of multi-level wells MW-4 through MW-7, and in the "C" level of well MW-9 <br />' Analytes of concern were not detected at or above laboratory reporting limits in cross- <br /> gradient multi-level well MW-8 <br />' 0 1,2-DCA and BTEX compounds were present above the DHS's Maximum Contaminant <br /> Levels (MCLs) in all levels of the multi-level well MW-4 No MTBE was detected in any <br /> samples from this monitoring event <br /> • The lateral extent of the dissolved 1,2-DCA appears to be limited near the eastern edge of <br /> the site The vertical extent of dissolved 1,2-DCA is poorly defined off-site <br /> I In general, the lateral and vertical extents of hydrocarbon-impacted ground water have not <br /> been defined <br /> I <br />' Advanced GeoEnvironmental,Inc <br /> r <br />