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I 1 1 and 24 hours, 2, 7, and 14 days The vapor influent samples were collected to evaluate the state of contaminant concentrations in the vadose zone The vapor influent concentrations after the re-start are presented in Table 3 The laboratory analytical data for the vapor influent concentrations during I the two week period after restart indicate that contaminant concentrations in the vadose zone had stabilized On June 24, 2003, the TCAT 500 catalytic oxidizer system was taken off line A skid- mounted 300 scfin blower with a knock-out pot and two 2,000 pound GAC vessels were transported ' to the Site to replace the TCAT 500 catalytic oxidizer On June 26, 2003, the SJVAPCD was onsite to witness the start-up of the 300 scfin blower SVE system The SJVAPCD requested the collection and laboratory analysis of a vapor influent and effluent sample upon start-up The SJVAPCD also icquired that weekly photoionization device (PID) readings of the vapor influent and effluent be collected and recorded The00 scf 3 m blower system is achieving greater vacuum and flow rates at the blower and at each individual vapor extraction well than the blower from the TCAT 500 system The average vacuum achieved with the TCAT 500 system was approximately 28 inches of water The average vacuum for the 300 scfin blower system is 80 inches of water The greater vacuum has resulted in higher flow ' rates from the well field The average flow rate with the TCAT 500 was 312 cfin and with the 300 scfin blower system the average flow rate is 383 cfm The higher vacuum has also resulted in greater ' vapor influent concentrations The average vapor influent concentration during the last four months of operation of the TCAT 500 was 227 parts per million per volume (ppmv) The average vapor influent concentration during the first three weeks of operation of the 300 scfin blower system is 465 ppmv ' Vacuum, flow rates, and PID readings for vapor extraction well V-3 have increased significantly since the start of the 300 sefin blower system vacuum The respective average performance data for V-3 with the TCAT 500 system was 27 inches of water, 39 cfin, and 77 (PID reading) After the start of the 300 scfm blower system, the respective average performance data for V-3 is 69 inches of water, 327 cfm, and 500 (PID reading) The SVE system removed approximately 199 pounds of TPHg, 3 5 pounds of benzene, and 0 pounds of MTBE between March 10 and July 16, 2003 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 4 MTBE removal data is presented in ' Table 5 A summary of the emissions data is presented in Table 6 SVE well data, including open/closed status, vacuum, flow, and PID data are presented in Table 7 Graphical presentation of TPHg and benzene mass removal and influent concentration data are shown on Figures 6 and 7J, ' 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 58643 06-01 -6- July 25 2003