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' 17 August 2000 <br /> • AGE-NC Project No. 98-0520 <br /> Page 3 of 4 <br /> The fuel oxygenate TBA was detected by EPA-Method.8260B in all the ground water samples <br /> collected at concentrations ranging from 12 ugll in MW-1 to 210µg/1 in MW-5. <br /> '1,2-DCA was not detected above laboratory reporting limits in the ground water samples collected. <br /> Analytical results of ground water samples are summarized on Table 2. The laboratory report (MAI <br /> Lab I.D. No. 38272 through 38276) and chain-of-custody forms are included in Appendix B. , <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' Based upon data collected from the site AGE concludes: <br /> P , <br />' 0 Depth to ground water at the site averaged approximately 17.00 feet bsg on 17 May 2000. <br /> • -On 17 May 2000 the ground water elevation at the site averaged approximately 19.65 feet <br /> above mean sea level and flowed toward the northwest under an average gradient of 0.0009 <br /> ft/ft. <br /> lie <br /> 0 TPH-g was detected in ground water samples from MW-5 (former UST area) at a <br /> concentration of 20,000µg11. <br /> • TPH-g and BTEX compounds were detected in all five ground water monitoring wells on- <br /> site. Further lateral definition is necessary to determine the horizontal extent of hydrocarbon- <br /> impact to ground water. <br />' TBA was detected in all five groundwater monitoring wells at concentrations as high as 210 <br /> µdl <br /> 5.0. RECOMMENDATIONS <br />' Based upon data collected from the site, AGE recommends: <br /> • Further site assessment to determine the lateral extent of petroleum hydrocarbon-impacted <br />,. and TBA-impacted ground water. <br /> • Installation of a minimum of five additional ground water monitoring wells to defne the <br />' plume of impacted ground water. Proposed monitoring well locations-are presented on <br /> Figure 2. <br /> •I Continued quarterly ground water monitoring. <br />' Advanced GeoEnvironmental,Inc. <br /> 1 <br />