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4 ` evron Products Company 2 'ion Service Station#9.4275,2905 Ben mann Holt Dnve Stockton,CA February 6 2001 r /Dunng the April 2000 site visit, the oxidizer was tested to ensure that it was operational / The oxidizer passed the test and was found to be in good working order 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 Dun ng the reporting period, the AS system was 81% operational The AS system operated at a flow rate of 13 4 cfm and an injection pressure of 11 7 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 not measured during the fourth quarter, 2000 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 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) 861-0400 Sincerely, SECOR International Incorporated Rusty trikosk , E Project Manager Attachments Table 1 - Air Sparge System Operational Data Table 2 - Dissolved Oxygen Well Concentrations (mg/1L) 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 Mark List, Regional Water Quality Control Board 077 41991034/9-4275 O&M 4Q00 Report