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Chevron ProduLs Comp tri) 2 Chevron Service Station 49-4275 2905 Bci anon Holt i]nve Stockton,CA March 20,2000 Air Sparging System The AS system is comprised of rune AS wells (GM-1 through GM-9) and a 1 5-hp rotary vane compressor The AS system alternately infects air into wells GM-1 through GM-5 and wells GM-6 through GM-9 During the reporting period, the AS system was not operational System downtime is associated with failure of the cooling fan and air sparge blower Both the cooling fan and air sparge blower have undergone repair and were replaced on December 14, 1999 The AS system was re-started on December 14, 1999 When operational, the AS system operated at a flaw rate of 15 95 cfm and an infection pressure of 10 5 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 December 16, 1999 and averaged 1 5 mg/L, a moderate increase 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 infect 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 ire' c Rusty 4— Benkosky, Project Manager Attachments Table l - 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 Lon 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 4099 Report