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SECOR 9.0 OZONE SPARGE SYSTEM OPERATIONAL DATA 9.1 Ozone Sparge (OS) System Configurations Two OS systems (termed East System and West System) operate at the site. The East System, which is located east of the BP and Time Oil facilities (Figure 1A), began operation on September 21, 2004. This system is comprised of a total of 26 "A" Zone OS wells (OS-32 through OS-57) and 8 "B" Zone OS wells (OS-96 through OS-166) that are connected to a 5- pounds per day ozone generator, a compressor rated to deliver 15 standard cubic feet per minute (scfm) of ozone at 40 pounds per square inch (psi), pneumatic actuated ball valves, manifolds, and a timer. The East System is capable of delivering 15 scfm of ozone to four or five OS wells simultaneously through piping connected to each individual OS point. The OS system piping is equipped with a manifold that will allow for the adjustment of the individual well injection rates. The West System, which is located at and in the vicinity of the Tesoro Terminal (Figure 1A), began operation on November 15, 2004. This system is connected to 31 "A" Zone OS wells (OS-1 through OS-31) and 8 "B" Zone OS wells (OS-1B through OS-813). The West System is constructed with the same specifications as described above for the East System. • 9.2 Summary of the Performance of the OS Systems During the first quarter 2006, SECOR obtained operational data for the East System during approximately twice-a-month operation and maintenance visits (January 27, February 17, February 23, and March 10, 2006). During the time period of December 13, 2005 through March 10, 2006 the East System was 90 percent operational, injected approximately 392 pounds of ozone into the subsurface, and an estimated 131 pounds of hydrocarbons were destroyed. On the March 10, 2006 site visit, it was discovered that the air compressor had seized. Replacement of the air compressor and restart of the East System is scheduled for the second quarter 2006. SECOR obtained operational data for the West System during an operation and maintenance visit on January 3, 2006. During the period from December 13, 2005 through January 3, 2006, the West System was 100 percent operational, injected approximately 105 pounds of ozone into the subsurface, and an estimated 35 pounds of hydrocarbons were destroyed. The West System was shut down on January 3, 2006 because standing water around the West System wells was infiltrating into the subsurface. The West System is anticipated to be restarted in second quarter 2006 after the standing surface water is gone. Performance data for the East and West Systems and remedial system field data sheets are included in Appendix I. Operational data for the East and West Systems are summarized in Tables 7 through 10. 9.3 Ozone Injection Monitoring Program In accordance with SECOR's ozone injection monitoring program, petroleum hydrocarbon trends are evaluated on a quarterly basis in select "A" zone and "B" zone monitoring wells, listed • in the table below. STTC 1Q06 Final Report 17 May 1,2006 770T.43673.12.0002