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S E C 0 R <br /> isRobert J Cochran <br /> April 30, 2003 <br /> Page 2 <br /> Remediation system field data sheets are presented in Attachment A Air sparge operational data, <br /> including flow rate and applied pressure data, are presented in Table 1 Dissolved oxygen <br /> concentrations for wells MW-1 through MW-9 are presented in Table 2 <br /> CONCLUSIONS <br /> The SVE system is turned off due to elevated groundwater levels It appears that the AS system <br /> continues to operate, infecting air Into the subsurface providing oxygen for in-situ bioremediation <br /> If you have any questions or require additional Information, please contact Mr Bob Jackson at (916) <br /> 861-0400 extension 283 <br /> Since <br /> Sincerely, <br /> SECOR International Incorporated <br /> Bob W Jackson Jr Greg McIver <br /> Staff Geologist Project Manager <br /> Attachments Figure 1 —Site Location Map <br /> Figure 2—Site Plan <br /> Table 1 —Air Sparge System Operational Data <br /> Table 2— Dissolved Oxygen Well Concentrations (µg/l) <br /> Attachment A— Remedial System Field Data Sheets <br /> cc /Lore Duncan, San Joaquin County Environmental Health Division, Stockton, CA <br /> Marcus Pierce, RWQCB-CVR, 3443 Routier Road, Suite A, Sacramento, CA 95827 <br /> • <br /> 1 1ChevroM942751Penodjc Monitoring12003 O&M11003 O&M Report 9 4275 doc <br />