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Chevron Products Company 2 <br /> Chevron Service Station#9-4275,2905 Benjamin Holt Dnve,Stockton,CA May 9,2000 <br /> Air Sparging System <br /> The AS system is comprised of nine AS wells (GM-1 through GM-9) and a 1 5-hp <br /> rotary vane compressor The AS system alternately infects air into wells GM-1 through <br /> GM-5 and wells GM-6 through GM-9 <br /> During the reporting period, the AS system was 99% operational The AS system <br /> operated at a flow rate of 12 5 cfm and an injection pressure of 10 6 pounds per square <br /> inch Air sparge operational data, including flow rate and applied pressure data, are <br /> presented in Table 1 <br /> Dissolved oxygen (DO) concentrations were measured in site monitoring wells on <br /> March 1, 2000 and averaged 16 mg1L, a moderate increase from the previous quarterly <br /> data Current and histoncal DO concentrations are summanzed in Table 2 <br /> Conclusions <br /> The SVE system will remain shutdown until water levels have dropped and exposed a <br /> sufficient length of screen in the SVE wells The AS system will continue to be <br /> operated to infect air into the groundwater and provide oxygen for biodegradation <br /> If you have any questions or require additional information, please do not hesitate to call <br /> me at(916) 364-1880 <br /> Sincerely, <br /> SECOR International Incorporated <br /> Rusty E Benk , P E <br /> Project Mana r <br /> Attachments Table 1 - Air Sparge System Operational Data <br /> Table 2 - Dissolved Oxygen Well Concentrations (mg/L) <br /> Figure 1 - Site Location Map <br /> Figure 2 - Site Plan <br /> Attachment A—Remedial System Field Data Sheets <br /> cc Ms Lon Duncan, San Joaquin Environmental Health Department <br /> Mr Paul Supple, ARCO Products Company <br /> Mr Mark List, Regional Water Quality Control Board <br /> 077 41672 001194275 O&M 1Q00 Report doc <br />