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ARCS assembled and transported the components of tine new oxygen condenser to Geocon and on August 20, 2003 the new oxygen condenser was retrofitted to the ozone sparge skid However, ' several other problems were discovered with the ozone sparge skid including missing components, loose wires, blown fuses, software problems with the Allen Bradley Program Logic Controller ' (PLC), fouled valves, and a dead backup battery for the PLC The ozone sparge system was returned to service on September 17, 2003 but not optimally producing ozone After additional troubleshooting and problem solving, the ozone sparge system was producing approximately 2 5 pounds of ozone per day and sparging at a rate of approximately 6 liters per minute beginning October 2, 2003 It was discovered that the hour meter was non-operational since the restart of the ' system on September 17, 2003, and service was returned to the hour meter on October 22, 2003 In response to the Fourth Quarter 2003 groundwater analytical data, the open/closed status of the sparge wells was reconfigured on October 15, 2003 to include all spas ge points except points 513, S14, S15, and 520 Historical operational data including well open/closed status, ozone leak detection monitoring data,and presence of an odor are presented in Table 7 3 3 3 Future Work ' Future work planned in the remainder of the Fourth Quarter 2003 and First Quarter 2004 include the following tasks * Conduct First quarter 2004 monitoring and sampling event in January * Conduct monthly sampling of the replacement well to domestic well DW-1 * Perform monthly O&M for the ozone sparge system * Conduct weekly PID readings on the vapor influent and effluent, perform monthly O & M ' for the SVE system I ProieU No 58643-06-01 -7- November 3,2003