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� , «1 Chevron Products Comp-my 2 <br /> Chevron Service Stwon 0-4275 2905 R,nwnin Holt Drive Stockton CA rehRKIry 10 1999 <br /> iAir Sparging System <br /> The AS system is comprised of nine AS wells (GM-I 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 approximately 88 percent operational <br /> The AS system operated at an average flow rate of 8 7 cfm at an average injection <br /> pressure of 7 5 pounds per square inch Air sparge operational data including flow rate <br /> and applied pressure data are presented in Table 1 <br /> Dissolved oxygen concentrations were measured in site monitoring wells on December <br /> 17, I998 and averaged 2 0 mg/L, a slight increase from the previous quarters data <br /> Current and historical dissolved oxygen 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) 364-1880 <br /> Sincerely, <br /> SECOR International ncorporated <br /> Rusty Benkosky, P <br /> Project Engineer <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 Laurie Duncan, San Joaquin Environmental Health Department <br /> Mr Paul Supple, ARCO Products Company <br /> x Mr Mark List, Regional Water Quality Control Board <br /> 7Cr007-032-01/9-4275 O&M 4Q98 Rt,poa doc <br />