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S E C O R <br />Richard C Prima Jr <br />March 14, 2003 <br />Page 2 <br />5,998,796 gallons Calculated discharge rates during this reporting period ranged from 6 84 to 7 18 <br />gallons per minute (gpm) <br />During this reporting period the GWET system extracted approximately 0 1 pounds each of TPHg <br />and MtBE To date, the GWET system has extracted approximately 8 6 pounds of TPHg, 0 2 <br />pounds of benzene, and 84 7 pounds of MtBE Plots of GWET system mass removal trends and <br />influent groundwater TPHg, benzene, and MtBE concentrations versus time are shown on Figures 4 <br />and 5, respectively Certified analytical reports and chain -of -custody documentation and GWET <br />system operation and maintenance field data sheets are included in Attachments 1 and 2, <br />respectively <br />SYSTEM MODIFICATIONS <br />There were no system modifications during this reporting period <br />SUMMARY OF VIOLATIONS <br />There were no violations of the discharge limitations during this reporting period <br />. RECOMMENDATIONS <br />Based on reduced concentrations SECOR recommends modifying the GAC change out schedule, <br />GAC will be replaced based on chemical constituent detections in midpoint samples <br />Should you have any questions or require additional information, please feel free to contact Bob <br />Jackson at (916) 861-0400 extension 283 <br />Sincerely, <br />SECOR International Incorporated <br />Bob W Jackson Jr tS M Evans <br />Staff Geologist Project Manager <br />i <br />11Chevron1957751Penodic MonitonngNO & WReportsWonthiyTischarge Reports12003117ebruary 2003 DR doc <br />