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r <br /> u <br /> Chevron Products Company 2 <br /> S <br /> Chevron Service Station#9-4275,2905 Ben amen Holt Drive,Stockton,CA temper 1,1999 <br /> rvi <br /> Air Sparging System <br /> The AS system is comprised of rune AS wells (GM-1 through GM-9) and a 1 5-hp rotary <br /> vane compressor The AS system alternately injects air into wells GM-1 through GM-5 <br /> and wells GM-6 through GM-9 <br /> During the reporting period, the AS system was 100 percent operational The AS system <br /> operated at an average flow rate of 16 7 cfin at an average injection pressure of 9 8 <br /> pounds per square inch Air sparge operational data, including flow rate and applied <br /> _- -pressure data, are presented in Table 1 _ <br /> Dissolved oxygen(DO) concentrations were measured in site monitoring wells on June <br /> 22, 1999 and averaged 17 mg/L, a slight decrease 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 operated <br /> to inject 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) 3 64-18 80 <br /> Sincerely, <br /> SECOR International corporated <br /> � r <br /> Rusty E Benkosky, P <br /> _ u Project Manager V <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 Lori Duncan, San Joaquin Environmental Health Department <br /> Mr Paul Supple, ARCO Products Company r =r <br /> Mr Mark List, Regional Water Quality Control Board <br /> 077 41672 00119-4275 O&M 2Q99 Report <br />