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i <br /> f <br />' 16 September 1997 <br /> AGE-NC Project No 95-0139 <br /> Page 4 of 5 <br />' approximately 15 2 kg, or 4 78 gallons of diesel remain <br /> Approximately 50 cubic yards of impacted soil was estimated to be in place near the new USTs' <br /> location Based on an average concentration of TPH-g of 120 ppm, approximately 6 88 kilograms, <br /> or 2 42 gallons of gasoline remains in the soil <br /> 4 0 SUMMARY AND CONCLUSIONS <br /> Based on data collected at the site, AGE concludes the following <br /> • The concentrations of TPH-g and TPH-d in monitoring well MW-1 decreased between the <br /> January and July 1997 monitoring events, but this decrease may be more due to natural <br /> fluctuation than to a long-term trend- <br /> • Petioleurn hydrocarbons were not detected in the samples collected from monitoring wells <br /> MW-2, MW-3 and MW-4 <br /> • The concentration of MTBE in MW-2 declined between the January and July 1997 sampling <br /> events Review of chromatograms from samples collected prior to 1996 indicates that MTBE <br /> was not previously present in MW-2 Additionally, MTBE was not evident on any of the <br /> chromatograms reviewed for samples collected from MW-1 or MW-4,located down-gradient <br /> of the former USTs location The MTBE detected does not appear to be related to the <br /> operation of the USTs removed from the western side of the site <br /> • The plume of impacted ground water appears to be stable <br /> A volume of 25 7 gallons of gasoline and 4 78 gallons of diesel were estimated to remain in <br /> a narrow band of soil north of the former USTs location Approximately 2 42 gallons of <br /> gasoline weie estimated to remain near the current USTs location <br /> - 5 0 RECOMMENDATIONS ' <br /> Based on data collected at the site AGE recommends the followin s <br /> g , <br /> • The site appears to be stable and should be considered for closure No further action for soil <br /> and ground water monitoring and remediation should be required at the site <br /> • Upon closure certification, all monitoring wells associated with the site should be <br /> -� abandoned/destroyed in accordance with local regulations <br /> Advanced CcoEnuronmcntal,Inc <br />