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Chevron Products Company 2 Chevron service station#9-4275,2905 Benjamin Holt Drtve,Stockton,CA January 18,2000 Air Sparging System The AS system is comprised of nine AS wells (GM-1 through GM-9) and a 1 5-hp 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 75 percent operational System downtime is associated with failure of the cooling fan and air sparge blower Both the cooling fan and air sparge blower are currently undergoing repair When operational, the AS system operated at an average flow rate of 13 3 cfm at an average injection pressure of 10 3 pounds per square inch Air sparge operational data, including flow rate and applied pressure data, are presented in Table 1 Dissolved oxygen (DO) concentrations were measured in site monitoring wells on September 13, 1999 and averaged 1 1 mg/L, a moderate decrease from the previous quarterly data Current and historical DO concentrations are summarized in Table 2 Conclusions The SVE system will remain shutdown until water levels have dropped and exposed 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, please do not hesitate to call me at (916) 364-1880 Sincerely, SECOR International Incorporated Rusty enkosky, Project Manager Attachments Tab e 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 Paul Supple, ARCO Products Company Mr Mark List, Regional Water Quality Control Board 077 41672 00119-4275 O&M 3Q99 Reportdoe