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S E C ® R k short term, and in the long term, have generally declined over time The dissolved plume remains defined In all directions by the existing monitoring well network, except northeast of off-site Shell wells S-5 and S-6 0 CHARACTERIZATION STATUS The highest concentrations of TPPH and MtBE have been detected in well MW-7 in the vicinity of the former USTs The highest concentrations of TBA have been detected in wells MW-3 and MW-7 In the vicinity of the former USTs, and in well MW-11, located north of the former USTs The extent of the GRO plume 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 been delineated In all directions, except northeast of Shell wells S-5 and S-6, and west of Shell well S-1 WASTE DISPOSAL The volume of purged groundwater generated during the first quarter 2005, and the method of disposal are documented in TRC's Quarterly Monitoring Report, January through March 2005 dated April 4, 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 Infection Operation The OS system consists of a wall mounted KVA C-Sparge TM System, model 5020, that produces 4 grams per hour (0 009 pounds per hour) of ozone As recommended in Gettler Ryan's Groundwater Monitoring Well, CPT, and Ozone Microsparge System Installation Report dated May 9, 2003, the OS system had been programmed to inject ozone In to 10 wells (SP-1 through SP-10) for between 5 and 15 minutes for each well cycling 16 times per day On March 22, 2005, the system was found not to be operating due to the ground fault current Interrupter (GFCI) being tripped The GFCI was reset y and the system was reprogrammed and restarted During the current quarter (December 2, 2004 to March 11, 2005), the OS system was operational for 83 percent of the programmed run time, resulting in 1,457 hours of operation and 13 pounds of ozone Injected Cumulatively, the OS system has operated for 9,499 hours, and has injected a total of approximately 85 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 r Monthly Groundwater Sampling Monthly groundwater samples are collected from monitoring wells MW-3 and MW-4, and analyzed for TPHg, BTEX, and MtBE and TBA by EPA Method 8260B Results of the t°4r 11ConocoPhdlips\Retad Sites1111921QSSR1200511Q2005 QSSR and QRPS doc