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r 16 V3, and V6 Based on vacuum readings, flows, and PID readings no adjustments were made to the status of the operating vapor extraction wells ' The approximate vacuum for the SVE system during the reporting period was 89 inches of water, and the approximate flow rate was 138 cfm The average SVE system influent TPHg concentration 1 during the reporting period was 130 parts per million volume (ppmv) The SVE system removed approximately 244 pounds of TPHg, 4 2 pounds of benzene, and 0 1 pounds of MTBE during the reporting period The SVE system operational and analytical data 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 1 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 135 ppmv The number of wells open to vacuum have been reduced to wells V2, V3, and V6 The mass removal trend (Figure 7) demonstrates that mass removal is on a steady low angle incline 3 3 2 Ozone Sparge System ' 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 5-19) located on- and offsite Sparge well 5-20 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 ' 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 to each well 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 ' Protect No S8643-06-01 -7- February 14,2005