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are shown on Figures 6 and 7, respectively Copies of the O&M field notes are included in Appendix A Influent and effluent vapor sample laboratory analytical reports ai a included in Appendix B As shown in Figure 6, the SVE system influent contaminant concentrations have remained fairly ' consistent since September 2003 with an average influent TPI-Ig concentration of 260 ppmv The number of wells open to vacuum have been reduced to wells V2, V3, V5, and V6 The mass removal ' trend (Figure 7) demonstrates that mass removal is on a steady low angle incline 3 3 2 Ozone Sparge S stem ' A slid-mounted ozone sparge syste3n, enclosed in a shed within the remediation compound, can inject ozone into groundwater through 19 available ozone sparge wells (S-1 through S-19) located on- and offsite Sparge well S-20 was not connected to the sparge system manifold and is not used An ozone meter attached to the ozone sparge system skid will shut down the remediation system if ozone is detected at levels greater than 0 01 ppm within the shed The ozone injection manifold is set up to inject ozone for 10 minutes at a time into the sparge wells It can cycle through 10 wells at 100% the maximum infection rate (one well at a tune), or all 20 wells (two wells at a time) at 50% the maximum injection rate Approximately 2 5 pounds of ozone can be injected into the subsurface each day at optnnum ozone production Ozone production is variable dependent on atmospheric ' temperatures The ozone sparge system is designed to deliver at an approximate rate of 6 liters per in1nute The ozone sparge system operated 5% of the reporting period The system failed on January 12, 2004 The problem was identified as a burned out thermal switch On February 3, 2004 a new thermal switch was installed and the system was returned to service Within minutes of startup, flames were observed inside the ozone generator and sparge system was shut down immediately The ozone generator was removed and transported back to ARCE Systems, Inc for repairs The ozone sparge system was returned to service on March 12 only to be turned off on March 15, 2004 To enable the construction of domestic well DW-1R the overhead electrical line to the remediation system had to be temporarily disconnected on March 15, 2004 Power was restored to the remediation system on April 5, 2004 At that time the ozone sparge system operated at maximum pr oductrvrty producing approximately 2 5 pounds of ozone per day and delivering at a rate of 8 to 10 liters pet hour Historical operational data including well open/closed status, ozone leak detection monitoring data, and presence of an odor are presented in Table 6 3 3 3 Future Work Future work planned in the r emainder of the Third Quarter 2004 include the following tasks ' • Perform monthly O&M for the ozone sparge system • Conduct weekly inspections on the operational status of the catalytic oxidizer and perform monthly O& M for the SVE system . 0 Remove and replace damaged sparge, vapor extraction and monitoring well enclosures 1'rol�,u No "643-06-01 -8- Tiny I,2004