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Chevron Products Company 2 Chevron Service Station#9-4275.2905 Benjamin}dolt Drive,Stockton,CA April 13,2001 . Air Sparging System The AS system is comprised of nine AS wells GM-1 through GM-9 and a 1.5-h Y P E g ) P rotary vane 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 63% operational. The AS system operated at a flow rate of 13.4 cfm and an injection pressure of 9.4 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 first 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 will remain shutdown until water levels drop to expose a sufficient length of screen in the SVE wells. The AS system will continue to be operated to inject air into the groundwater and provide oxygen for biodegradation. If you have any questions or require additional information, contact Scott Gable at (916) 861-0400 X 231 or Mr. Robert Cochran at (925) 842-9655. Sincerely, SECOR International Incorporated Greg McIver�) Project Scientist l Cott Gable 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 Plan Attachment A—Remedial System Field Data Sheets cc: �Ms. Ldri Duncan; San Joaquin Environmental Health Department 'Mr. Mark List,Regional Water Quality Control Board 1AChevronk942751Periodic Monitoring12001 O&M19-4275 O&M EQ01 Report.doc