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i <br /> 12 January 2007 <br /> AGE-NC Project No. 96-0232 <br /> Page 5 of 7 <br /> an ozone air-sparging pilot test at the site by second quarter 2003 to evaluate and potentially <br /> mitigate the dissolved TPH-d in the former UST area. <br /> AGE: 20 October 2003:AGE recommended in the quarterly reportto operate an active free-product <br /> recovery system at well MW-4.The ozone-sparging pilot test suggests that rapidly increasing <br /> concentrations of TPH-d and TPH-g in wells MW-4 and off-site well MW-1 may be <br /> attributed to re-mobilization and migration of these contaminants by the ozone-sparging <br /> process. However, before any additional evaluation of the ability of ozone-sparging to <br /> attenuate the high concentrations of TPH-d and TPH-g should be conducted,the location of <br /> the main petroleum hydrocarbon-impacted zone, at the northeast corner of the site and off- <br /> site towards the northeast, requires addressing the problem of containment of off-site <br /> migration of the contaminants. <br /> AGE: 19 April 2004: AGE recommended in the quarterly report to operate a passive free-product <br /> recovery system at wells MW-1 and MW-4 may reduce any free-product formed and <br /> accumulated during non-monitoring periods. <br /> AGE: 19 July 2004:AGE recommended in the quarterly report the preparation of closure summary <br /> report, if appropriate. <br /> AGE: 27 December 2004: AGE recommended in the quarterly report to continue quarterly ground j <br /> water monitoring at the site for dissolved TPH-d;the next monitoring event is scheduled for <br /> January 2005. <br /> AGE: 29 July 2005:AGE recommended in the quarterly report to continue quarterly ground water <br /> monitoring at the site for dissolved TPH-d;the next monitoring event is scheduled for May <br /> 2005. <br /> AGE: 30 August 2005: AGE recommended in the quarterly report to initiate interim remediation <br /> to control the migration and reduce the concentrations of the petroleum hydrocarbon ground <br /> water plume at the site. <br /> AGE: 27 December 2005: AGE recommended in the quarterly report to install monitoring wells <br /> to the north of well MW-1 and to the east of well MW-4 to further define the north and ' <br /> eastern sectors of the TPH-d plume;initiate interim ground water remediation to control the <br /> migration and reduce the concentrations of the petroleum hydrocarbon ground water plume <br /> at the site; <br /> AGE: 08 March 2006: AGE recommended in the quarterly report to renew efforts to locate <br /> monitoring well MW-5;install of monitoring wells to the north of well MW-1 and to the east <br /> Advanced GeoEnvironmental,Inc. <br /> I <br />