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Chevron Products Company 2 Chevron Service Station#9-4275,2905 Ben anon Holt Dnve,Stockton,CA August 5 2002 Air Sparging System . The AS system includes nine AS wells (GM-1 through GM-9), underground piping, and a 1 5-hp rotary vane air compressor The AS system injects air into wells GM-1 through GM-5 and wells GM-6 through GM-9 During the reporting period, the AS system was 28% operational A non-operational blower was discovered on April 11, 2002 a rebuilt blower was installed on May 10, 2002 The rebuilt blower was discovered seized on June 7, 2002, a new blower was installed on 6/19102 The AS system operated at an average flow rate of 22 1 standard cubic feet per minute (scfm) and an average injection pressure of 9 5 pounds per square inch gauge (psig) Remedial system field data sheets are presented in attachment A Air sparge operational data, including flow rate and applied pressure data, are presented in Tablel. Dissolved oxygen concentrations for wells MW-1 through MW-9 are presented in Table 2 Conclusions • The SVE system remains inactive pending a determination from Chevron to reactivate or modify the existing system • The AS system continues to operate, injecting air into the groundwater, which provides oxygen for in-situ bioremediation . If you have any questions or require additional information, please contact Bob Jackson at (916) 861-0400 x 283 or Greg McIver at (916) 861-0400 x 279 Sincerely, SECOR International Incorporated Bob W Jackson Jr McIver Staff Geologist Project Manager Attachments Table 1 - Air Sparge System Operational Data Table 2 - Dissolved Oxygen Well Concentrations (mg/L) Figure 1 - Site Location Map Figure 2 - Site Plan Attachment A—Remedial System Field Data Sheets cc Ms Lori Duncan, San Joaquin Environmental Health Department Mr Marty Hartzell, California Regional Water Quality Control Board I 1Chevron1942751Penodic MomtonngM02 O&M12Q02 O&M Report doc