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E C 0 R <br /> Fourth Quarter 2003 Remedial Systems Status Report <br /> January 22, 2004 <br /> Page 2 <br /> Remediation system and monitoring well dissolved oxygen concentration field data sheets are <br /> presented in Attachments A and B, respectively Air sparge operational data, including flow rate and <br /> applied pressure data, are presented in Table 1 Dissolved oxygen concentrations for wells MW-1 <br /> through MW-9 are presented in Table 2 <br /> CONCLUSIONS <br /> The SVE system has been deactivated due to elevated groundwater levels The AS system <br /> continues to operate, injecting air into the subsurface providing oxygen for in-situ bioremediation of <br /> any remaining petroleum hydrocarbons <br /> It you have any questions or require additional information, please contact Mr Greg McIver at (916) <br /> 861-0400 extension 279, or Mr Robert J Cochran of Chevron at (925) 842-9655 <br /> Sincerely, <br /> SECO Internatio IIncorporated <br /> �Lw , " <br /> Karam Parmar Greg Mc er <br /> Staff Engineer project M <br /> Enclosures <br /> Figure 1 Site Location Map <br /> Figure 2 Site Plan <br /> Table 1 Air Sparge System Operational Data <br /> Table 2 Monitoring Well Dissolved Oxygen Concentrations <br /> Attachment A Remediation System Field Data Sheets <br /> Attachment B Monitoring Well Dissolved Oxygen Concentration Field Data Sheets <br /> cc ✓Lon Duncan, San Joaquin County Environmental Health Division, Stockton, California <br /> Marcus Pierce, RWQCB-CVR, Sacramento, California <br /> • <br /> I\Chevron\94275\Penodic Monitonng\2003 O&M\4003 O&M Report 9 4275 doc <br /> t <br />