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The SVE system removed approximately 283 9 pounds of TPHg, 4 5 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 Table 4 SVE well data, including open/closed status, vacuum, flow, and PID data are presented in ITable 5 Graphical presentation of influent concentration and TPHg and benzene mass removal 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 demonstrated a declining trend since September 2002 A detail of this figure (presented as Figure 6A) shows the SVE influent concentrations from July 2003 to April 2005 Trend lines were added to the charted data to demonstrate the declining trend of TPHg and benzene The rate of decline has been slow over the past twelve months, however, the SVE System is still removing approximately five pounds per day The number of wells open to vacuum remained the same as in the previous quarter (V2, V-3, and V-6) The mass removal trend shown in Figure 7 indicates the rate of mass removal has remained fairly constant since March 2004 ' 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 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 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 ' The ozone sparge system operated approximately 52% of the time during the reporting period ' During the first month of the reporting period, the ozone sparge system operated 100% of the time Between March 7 and April 6, the system operated approximately one day a week due to automatic . shutdown by the ozone meter as described below On April 6, the system was taken off-line 1 indefinitely Project No 58643-06-01 -7- May 5 2005