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16 The ozone sparge system operated 11% of the time during the reporting period On December 17, <br /> 2004 the ozone sparge system was not producing ozone The ozone generator was non-functional <br /> due to a blown thermal switch and other undetermined failures, and the oxygen condenser is 50% <br />' operational, thus, reducing ozone infection to 50% capacity <br />' Replacement parts (ozone generator and oxygen condenser) were scavenged from a similar system <br /> that was not in use On January 31, the ozone generator and oxygen condenser were replaced and the <br /> system was re-started Upon re-start it was discovered that the air compressor and sparge pump were <br />' not functioning at tolerable pressures Thus, the air compressor and sparge pump were scavenged <br /> from the out of service system and placed into the sites' system During replacement, severe <br />' corrosion was observed in the sparge pump and in the pipe connecting the sparge pump to the <br /> distribution manifold The system was returned to service on February 1, 2005 at optimal production <br />' Based on the contaminant distribution in groundwater, the sparge wells open to the ozone sparge <br /> system were modified on February 1 The sparge wells chosen for distribution of ozone include the <br />' sparge wells (S-1 through S-8 and S-17 through S-19) in the vicinity of and downgradient of <br /> groundwater monitoring wells MW-1 and MW-3 <br />' Historical operational data including well open/closed status, ozone leak detection monitoring data, <br /> and presence of an odor are presented in Table 6 <br /> 3 3 3 Future Work <br /> Future work planned in the remainder of the First Quarter 2005 include the following tasks <br />' • Perform monthly O&M for the ozone sparge system <br />' 0 Conduct weekly inspections on the operational status of the catalytic oxidizer and perform <br /> monthly O&M for the SVE system <br /> i <br /> 1 <br />' Project No 58643-06 01 -8- rebruary 14 2005 <br />