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f <br /> 1� 1 <br /> 25 January 2005 <br /> AGE-NC Project No 99-0559 <br /> Page 9 of 10 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on data collected during the monitoring event, AGE concludes <br /> • The general ground water flow direction was towards west in the first encountered water <br /> table and generally towards the north in the lower hydrogeologic units during the fourth <br /> quarter <br /> • During the quarter the highest concentrations of petroleum hydrocarbons detected at the site <br /> were present in the ground water samples collected from wells screened in HU3 at the east <br /> edge of the UST area The HU1 and HU2 interval normally contains the highest petroleum <br /> hydrocarbons concentrations, but this interval was dry at the time of the December 2004 <br /> monitoring event <br /> • During fourth quarter 2004, the concentrations of petroleum hydrocarbons decreased or <br /> remained stable in multi-level wells MW-5 through MW-7 <br /> • 1,2-DCA was not detected in samples from the site <br /> • The vertical extent of impacted ground water, has been defined at the perimeter of the site, <br /> the vertical extent of impacted ground water at the western and southern edge of the site are <br /> defined by well MW-5, and to a lesser degree by MW-6 The vertical extent of impacted <br /> ground water, at the former UST area, has not been defined and extends beyond the vertical <br /> depth of well MW-7E <br /> • The lateral extent of shallow,impacted ground water towards the west and southwest, down- <br /> gradient of the UST area, has not been defined <br /> • The ground water remediation system operation successfully removed 5,238 lbs of TPH-g, <br /> 80 lbs of benzene or 105 lbs of MTBE during the third and fourth quarters of 2004, with a <br /> total of 5,768 lbs of TPH-g, 140 lbs of benzene and 262 6 lbs of MTBE extracted from the <br /> upper hydrogeologic units at the site <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings and conclusions in this report, AGE recommends the following <br /> • Continued quarterly ground water monitoring, the next quarterly monitoring event is <br /> scheduled for March 2005 <br /> Advanced GenEnvironmental,Inc <br />