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w Chevron Products Company 2 Chevron Service Station#9-4275,2905 Benjamin Holt Drive,Stockton,CA March 4,2002 v 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 alternately injects air into wells GM-1 through GM-5 and wells GM-6 through GM-9 During the reporting period, the AS system was 76% operational due to a power failure of the air sparge blower The AS system operated at a flow rate of 18 2 standard cubic feet per minute (scfm) and an infection pressure of 9 1 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 Table 1 Dissolved oxygen (DO) concentrations were not measured during the fourth quarter 2001 monitoring and sampling event but will be recorded during future monitoring events Historical DO concentrations are summarized in Table 2 Conclusions ® The SVE system remains inactive pending a determination from Chevron to reactivate or modify the existing system o The AS system continues to operate, infecting air into the groundwater, which provides oxygen for in-situ biodegradation If you have any questions or require additional information, please contact Greg McIver at (916) 861-0400 x 279 or Scott Gable at (916) 861-0400 x 231 Sincerely, SECOR International Incorporated i Brian Carey Staff Geologist c t able Senior Geologist Attachments Table 1 - Air Sparge System Operational Data Table 2 - Dissolved Oxygen Well Concentrations (mg/L) Figure 1 - Site Location Map Figure 2 - Site Pian 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 IChevron1942751Penodic Momtonng12001 0&M14Q01 O&M Report doe