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1 1 L 30 April 2005 AGE-NC Project No 00-0769 ' Page 6 of 7, HU-5 N 1 _ , Ground water samples from"E"wells MW-4E and MW-5E were collected from HU-5 (193 feet to 198 feet big-)` TPH-g was detected at in the samples collected from wells MW-4E and MW-5E at concentrations ' of 2,700 µg11 and 800 µg/1, respectively (Figure 11) BTEX compounds were detected In'wells MW-4E and MW-5E at maximum concentrations of ' 500µg/l benzene,480 µg/l toluene, 36µg11 ethylbenzene and 234 µg/1 total xylenes in well MW-4E r No other constituents of concern'were detected at or above laboratory reporting limits in the ground water samples collected during the fourth quarter sampling event Analytical results of ground water samples are summarized in Tables 2 through 5 The laboratory report (CTEL Project No CT214- 0412021 and CT214-0412012), quality assurance/quality control (QA/QC) reports, and chain of ' custody forms are provided in Appendix C Documents confirming the upload of laboratory electronic deliverable format (EDF) files and depth to water measurements to GeoTracker are ' . included in Appendix E 4.0. SUNEVIARY AND CONCLUSIONS Based on data collected during the December 2004 ground water monitoring event,AGE concludes • Ground water elevation at the site ranged from,14 67 feet to 19 13 feet below MSL during the December 2004 monitoring event ' The HU-1 potentiometric surface is in the shape of a east-west trending ridge, ground water generally flowed east,north and south away from this ridge at gradients between 0 003 ft/ft ' Ground water flow in HU-2 is generally south and southeast at a gradient of 0 003 ft/ft ' Ground water in HU-3 generally flows south ata gradient of 0 009 ft/ft The HU-4 potentiometnc surface consists of a northwest-plunging ridge,ground water flows generally toward the northwest north at approximately 0 004 ft/ft to 0 008 ft/ft(Figures 3 through b) 1 • The` most highly impacted ground water appears to be located near the former USTs Laterally, analytes of concern were detected at or above laboratory reporting limits in�all ' wells except multi-level wells MW-8 and MW-9 and single=level well MW-2A, vertically, hydrocarbon-impacted ground water was detected in each of the screened intervals of multi- level wells MW-4 through MW-7 - 1 • The lateral and vertical extent's of petroleum hydrocarbon-impacted ground water have not • been defined The vertical extent of the fuel additive 1,2-DCA is not defined, however,the 1 j Advanced GeoEnvironmental,Inc � t