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Chevron Products Company 2 <br /> Chevron Service Station#94275,2905 Benjamin Holt Drive,Stockton,CA October 12,2001 <br /> Air Sparging System <br /> The AS system includes nine AS wells (GM-1 through GM-9), underground piping, and <br /> a 1.5-hp rotary vane air compressor. The AS system alternately injects air into wells <br /> GM-1 through GM-5 and wells GM-6 through GM-9. <br /> During the reporting period, the AS system was 50% operational due to the failure of <br /> the air sparge blower. The air sparge blower was rebuilt and reinstalled on August 17, <br /> 2001. Upon restart, the AS system operated at a flow rate of 14.5 standard cubic feet <br /> per minute (scfm) and an injection pressure of 6.0 pounds per square inch gauge (psig) <br /> Remedial system field data sheets are presented in attachment A. Air sparge operational <br /> data, including flow rate and applied pressure data, are presented in Table 1. <br /> Dissolved oxygen (DO) concentrations were not measured during the third quarter, <br /> 2001 monitoring and sampling event but will be recorded during future monitoring <br /> events. Historical DO concentrations are summarized in Table 2. <br /> Conclusions <br /> The SVE system remains inactive pending a determination from Chevron to reactivate <br /> or modify the existing system. <br /> The AS system continues to operate injecting air into the groundwater which provides <br /> oxygen for in-situ biodegradation. <br /> • <br /> If you have any questions or require additional information, please contact Greg McIver <br /> at(916) 861-0400 x 279 or Scott Gable at(916) 861-0400 x 231. <br /> Sincerely, <br /> SECOR International Incorporated <br /> /;Z, <br /> Greg McIver <br /> Project Scie 'st <br /> ott Gable <br /> Senior Geologist <br /> Attachments: Table I - 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. Marty Hartzell, Califomia Regional Water Quality Control Board <br /> 1:1Chevron1942751Periodic Monitoring12001 O&M13Q01 O&M Report.doc <br />