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S E C 0 R <br /> during previous site assessments, and consistent concentrations of MtBE and TBA in <br /> deeper well MW-11 <br /> r <br /> WASTE DISPOSAL <br /> The volume of purged groundwater generated during the second quarter 2005, and the <br /> method of disposal are documented in TRC's Quarterly Monitoring Report, April through <br /> June 2005 dated June 28, 2005 (Attachment 1) <br /> �$al <br /> REMEDIAL PERFORMANCE SUMMARY <br /> An OS system has been operational at the site since December 20, 2002 A summary <br /> of the operation of the ozone injection system, and monthly groundwater sampling <br /> activities are presented in the following sections <br /> Ozone Injection Operation <br /> The OS system consists of a wall mounted KVA C-SpargeTM System, model 5020, that <br /> produces up to 4 grams per hour (0 009 pounds per hour) of ozone The OS system <br /> had been programmed to inject ozone in to 10 wells (SP-1 through SP-10) for 8 minutes <br /> for each well cycling 16 times per day resulting in 89 percent programmed runtime The <br /> configuration of the system is presented on Figure 1 On April 25, 2005, the system was <br /> found not to be operating due to a tripped 16-amp breaker The breaker was reset, and <br /> when the technician tried to restart the system, it was noted that the bearings In the <br /> compressor were frozen The system was left off-line until a new compressor was <br /> installed on May 31, 2005 The OS system operated continuously through June 29, <br /> 2005 <br /> E� <br /> During the current quarter (March 22, 2005 to June 29, 2005), the OS system was <br /> operational for 26 percent of the programmed run time, resulting in 545 hours of <br /> operation and 5 pounds of ozone injected Cumulatively, the OS system has operated <br /> for 10,044 hours, and has injected a total of approximately 90 pounds of ozone Table 1 <br /> presents the operating data for the OS system, and includes operating hours and "_o <br /> pressure readings Remediation system field data sheets are included in Attachment 2 r41' <br /> Monthly Groundwater Sampling <br /> Monthly groundwater samples are collected by SECOR from monitoring wells MW-3 and <br /> MW-4, and are submitted to STL for analysis for GRO, BTEX, MtBE, and TBA by EPA <br /> Method 82608 Results of the monthly groundwater sampling events are summarized in p <br /> Table 2 In addition to the collection of monthly groundwater samples, SECOR also <br /> records oxidation reduction potential (ORP) and dissolved oxygen (DO) measurements <br /> in wells MW-3 and MW-4 on a monthly basis The ORP and DO data are also included <br /> in Table 2 • <br /> t <br /> t <, <br /> 1 1ConocoPhi1hps\Retad Sdes1111921QSSR1200512Q2005 QSSR and QRPS doc M`; <br /> s t <br />