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' 10 April 2003 <br /> AGE-NC Project No 99-0559 <br />' Page 7of8 <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based on data collected during the monitoring event, AGE concludes <br /> • The general ground water flow direction for HUl/HU2, HU3/HU4, HU5U and HU5L was <br /> west to north-northwest Ground water flow direction in the deepest hydrologic unit(HU6) <br /> - appeared to flow south <br /> • Free product continues to be present in well MW-2, and a very small layer of free product <br /> was detected in well MW-3, located at the south end of the UST area <br /> • The highest concentrations of petroleum hydrocarbons detected at the site were present in <br /> the ground water samples collected from wells screened in HU1 and HU2 at the UST area <br /> In addition, high concentrations of petroleum hydrocarbon compounds were detected at all <br /> sample depths in well MW-7 <br /> • Relative to the previous quarter, the concentrations of TPH-g appeared to increase, only <br /> samples MW-7D and MW-8A showed significant declines BTEX compounds and MTBE <br /> decreased or remained essentially unchanged Overall lower concentrations of TPH-g and <br />[ 0 BTEX compounds were detected in well MW-8 relative to the previous quarter <br /> • TBA,TAME and 1,2-DCA were detected in samples from the former UST area, and down- <br /> gradient of the UST area <br /> • The vertical extend of impacted ground water at the former UST area has not been defined <br /> at the site In addition, the lateral extent of impacted ground water towards the west and <br /> Isouthwest, down-gradient of the UST area, has not been defined <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings and conclusions in this report, AGE recommends the following <br /> • Continue quarterly ground water monitoring, the next quarterly monitoring event is <br /> scheduled for April 2003 <br /> • Installation of additional monitoring wells west and southwest of the:site to define the lateral <br /> extent of petroleum hydrocarbons-impacted ground water <br /> • Installation of a shallow to intermediate depth ground water extraction system to minimize <br /> the lateral migration of petroleum hydrocarbons-impacted ground water <br /> • <br /> Advanced GeoEnvironmental,Inc <br />