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Chevron Products Company 2 <br /> Che%Ton Service Station#9-4275 29(5 Stockton CA Au st 31 1998 <br /> AS system operational data including flow rate and applied pressure data are presented <br /> in Table 3 The AS system operated at an average flow rate of 10 cfm at an average <br /> injection pressure of 11 pounds per square inch The AS system was 100 percent <br /> operational between April 3 and June 15, 1998 Dissolved oxygen concentrations <br /> measured in site monitoring wells on June 24, 1998 averaged 1 1 mg/L (Table 4), <br /> compared to 2 2 mg/L, 0 7 mg/L, and 1 6 mg/L measured in March 1998, November <br /> 1997, and May 1997, respectively <br /> Conclusions <br /> The SVE system will remain shutdown until water levels have dropped and exposed a <br /> sufficient screen in the SVE wells The AS system will continue to be operated to infect <br /> 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 enkosky <br /> Projectngineer <br /> Attachments Table 1 - Soil Vapor Extraction System Performance Data <br /> Table 2 - Soil Vapor Extraction System Emission Data <br /> Table 3 - Air Sparge System Operational Data <br /> Table 4 - 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 Mr James Wong, San Joaquin Environmental Health Department <br /> Mr Paul Supple, ARCO Products Company <br /> Mr Mark List, Regional Water Quality Control Board <br /> • <br /> 7G007-032-01/9-4275 O&M Q2 Report doc <br />