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I <br /> I ^ Il <br /> .]1,� R' k ♦' Y-^' CSS t i^ <br />' 12 February 2004 <br /> I• 1 AGE-NC Project No 00-0769 , <br />' i l Page 6 of 7 <br /> t ! <br /> I <br />' HU-5 <br /> A ground water sample from "E" well MW-4E was'collected from HU-5 <br />' TPH-g was detected at a concentration,of 1,400 µg/L(Figure 11) No sample was taken from MW- <br /> , <br /> 5E, so there is not enough data to conour Figure 11 <br /> BTEX compounds1 were detected at concentrations of 400 µg/L benzene, 310 µg/L toluene, 38 µg/L <br /> ethyl benzene and 213 gg/L total xylenes <br /> The fuel oxygenate 1,2 DCA was detected at a concentration of 26 µg/L <br /> I <br /> r No other constituents`ofI concern were detected above laboratory reporting limits in the water <br /> 1 ' <br /> h samples collected during the third quarter sampling event Analytical results of ground 'water <br /> monitoring well samples are summarized in Tables 2 through 5 The laboratory reports (CTEL <br />' Project No CT214-0309022) and chain-of-custody forms are presented in Appendix C ; <br /> J <br /> I I <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of the site investigation ' <br /> • Depth to ground water at the site vaned between 25 81 and 30 52 feet bsg, relative ground <br /> water elevations at the site ranged between 16 13 and 19 85 feet below MSL during the ' <br />'i September 2003 monitoring event HU-1 generally flowed northeast at 0 002 ft/ft HU-2 <br /> generally flowed east-northeast at 0 002 fl/ft HU-3 generally flowed east-northeast at 0 001 <br /> ft/ft HU-4 generally)flowed north in anarc with gradients of 0 009 ft/ft to 0 006 ft/ft to 0 01 <br /> A/ft (Figures 3 through 6) <br /> 1 <br /> • The most highly impacted ground water appears to be near the first and second former UST ' <br />' locations, figures 7 through 11 illustrate the lateral extent of hydrocarbon`impacted ground <br /> water, as depicted within each modeled hydrogeologic unit Vertically, ,hydrocarbon- <br /> impacted ground,water was detected in each of the screened intervals of'multi-level wells <br /> MW-4 through MW-7 Up-gradient multi-level well MW-9 and cross-gradient multi-level <br /> well MW-8 had low to non-detectable concentrations of petroleum hydrocarbon compounds, <br /> except MW-8A I , <br /> 1 L <br /> s + The concentrations of dissolved hydrocarbons decreased m the samples taken from MW-4 <br /> from HU-1 to HU-3 and to a less degree increased in HU-4 and HU-'S <br /> i I Advanced Geo Environmental,Inc <br /> 4 � 1 <br /> I <br />