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including hours of operation, applied vacuum, flow rate, field PID data, influent TPHg and benzene concentrations, and mass removal data-are presented in Table 2. MTBE removal data are presented in Table 3. A summary of the emissions data is presented in Table 4. SVE well data, including open/closed status; vacuum, flow, and PID.data are presented-in Table 5. Graphical presentation of TPHg and benzene mass removal and influent concentration data 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 are included in Appendix B, As shown in Figure 6; the SVE system influent contaminant concentrations have remained fairly consistent since January 2004 with an average influent TPHg concentration of 138 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 lowangle incline. 3.3.2 Ozone Sparge 5 stem A .skid-mounted ozone sparge system, 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 injection rate (one well at a time), or all 19 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 optimum 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 minute. The ozone sparge system operated 86% of the time during the for the reporting period, Since April 9, the sparge system operated 100% of the time up to May 3. On May 3, it was observed that ozone was not being delivered to the sparge points due to mineral deposits in-the ozone lines. The lines were cleared and the Ozone sparge system was returned to service. On May 26, it was discovered that the air compressor on the sparge system had failed (piston blew through the casing of the compressor) and needed replacement, A new compressor was purchased from Nor Cal Instruments. On June 14, the new compressor was installed and the ozone sparge system was returned to service, At that time, the ozone .sparge system was capable of operating at maximum productivity producing approximately 2.5 pounds of ozone per day and delivering at a rate of 8 to 10 liters per hour. However, summer temperatures inside the ozone sparge shed have exceeded 100° Fahrenheit and ozone production was reduced. Project No.58643-06-01 .8 December 30,2004