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S EC ® R ff{{ CHARACTERIZATION STATUS The extent of the dissolved GRO and benzene plumes has been delineated, except west of Shell well S-1 The dissolved MtBE plume has laterally been delineated, except northeast of Shell wells S-5 and S-6 The presence of dissolved TBA has laterally been delineated in the vicinity of the site, except northeast of Shell wells S-5 and S-6, and west of Shell well S-1 The vertical extent of dissolved MtBE and TBA beneath the site has not been delineated, based on the presence of MtBE and TBA in CPT borings drilled during previous site assessments, and consistent concentrations of MtBE and TBA in deeper well MWA 1 SECOR will submit a work plan for additional lateral and vertical delineation of dissolved impacts beneath and in the vicinity of the site during the fourth quarter 2005 In addition, required actions will be determined to restore well MW-8 WASTE DISPOSAL The volume of purged groundwater generated during the third quarter 2005, and the method of disposal are documented in TRC's Quarterly Monitoring Report, July through September 2005 dated September 29, 2005 (Attachment 1) REMEDIAL PERFORMANCE SUMMARY An OS system has been operational at the site since December 20, 2002 A summary of the operation of the ozone injection system, and monthly groundwater sampling activities are presented in the following sections Ozone Injection Operation The OS system consists of a wall mounted KVA C-SpargeTm System, model 5020, that produces up to 4 grams per hour (0 009 pounds per hour) of ozone The OS system had been programmed to inject ozone in to 10 wells (SP-1 through SP-10) for 8 minutes for each well cycling 16 times per day, resulting in 89 percent programmed runtime The configuration of the system is presented on Figure 1 On August 24, 2005, the system was off-line due to a non-functioning controller The manufacturer, Kerfoot Technologies, was contacted to determine if the controller could be repaired or if a new controller was needed The OS system remained off-line until a new controller was installed, and the system was restarted on September 28, 2005 During the current quarter (June 29, 2005 to September 28, 2005), the OS system was operational for 27 percent of the programmed run time, resulting in 671 hours of operation and 6 pounds of ozone injected Cumulatively, the OS system has operated for 10,715 hours, and has injected a total of approximately 96 pounds of ozone Table 1 presents the operating data for the OS system, and includes operating hours and pressure readings Remediation system field data sheets are included in Attachment 2 Monthly Groundwater Sampling Monthly groundwater samples were collected by SECOR from monitoring wells MW-3 and MW-4, and were submitted to STL for analysis for GRO, BTEX, MtBE, and TBA by . EPA Method 8260B During the third quarter 2005, groundwater samples were collected ti from the wells on July 13, 2005, August 24, 2005, and September 28, 2005 Results of v