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S E C ® R hydrocarbons calculated as gasoline (TPHg) and 183 pounds of benzene has been extracted and treated rfiz 4 During the first quarter 2003 a carbon absorption system was installed to treat off-gas During the current quarter the SVE system was operated continuously from August 12 through September 18, 2004 Based on FID readings collected during SVE system O&M, approximately 12 lbs of petroleum hydrocarbons were removed during the quarter The initial influent concentration was 18 ppmv on August 12, but was quickly reduced to non-detectable levels of petroleum hydrocarbons Based on the results of the third quarter 2004 data (both groundwater monitoring and remediation system operational data) ozone sparging continues to be effective in reducing petroleum hydrocarbon concentrations Dissolved MTBE and other hydrocarbon levels have declined over time since ozone sparge system startup in 2001 (1 a as shown in Figures B-1 and B-2, Attachment B) Continued pulsing of the existing SVE system is no longer a cost effective remedial technology based on no detectable petroleum hydrocarbons in the system influent SECOR recommends that the ozone sparge system continues operation and requests authorization from the San Joaquin County Public Health Services to remove the SVE system CHARACTERIZATION STATUS Contamination in soil and groundwater has been adequately delineated RECENT SUBMITTALSICORRESPONDENCE None THIS QUARTER ACTIVITIES(Third Quarter 2004) 1 Performed quarterly groundwater monitoring and sampling (TRC) 2 Prepared and submitted a quarterly summary report 3 Performed remedial system O&M NEXT QUARTER ACTIVITIES(Fourth Quarter 2004) r 1 Prepare and submit a quarterly summary report F A 2 Perform quarterly groundwater monitoring and sampling a 3 Perform remedial system O&M 4 Remove the existing SVE system upon approval of San Joaquin County Environmental Health Department •