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Chevron Products Company 2 <br /> Chevron service Station#9-4275,2905 Benjamin Holt Drive,Stockton CA August 31 2000 <br /> During the April 2000 site visit, the oxidizer was tested to ensure that it was operational <br /> The oxidizer passed the test and was found to be in good working order <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 injects 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 85% operational Downtime was <br /> attributed to a power failure between the May and June site visits The AS system <br /> operated at a flow rate of 112 cfm and an infection pressure of 10 7 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 June <br /> 13, 2000 and averaged 19 mg/L, a moderate increase from the previous quarterly data <br /> Current and historical DO concentrations are summarized 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) 861-0400 <br /> Sincerely, <br /> SECOR International In orporated <br /> kRust'ytBienikos4, E <br /> Project Manager <br /> Attachments Tab 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 Lori Duncan, San Joaquin Environmental Health Department <br /> Mr Paul Supple, ARCO Products Company <br /> Mr Mark List, Regional Water Quality Control Board <br /> 077 41991 034/9-4275 O&M 2Q00 Report <br />