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• <br />• <br />SECOR <br />Richard C Prima Jr <br />December 13, 2002 <br />Page 2 <br />GWE system has treated a total of 4,995,246 gallons Calculated discharge rates during this <br />reporting period ranged from 7 05 to 10 34 gallons per minute (gpm) <br />During this reporting period the system extracted approximately 1 3 pounds of TPHg, and 01 <br />pounds of MtBE To date, the system has extracted approximately 8 2 pounds of TPHg, 0 2 pounds <br />of benzene, and 84 4 pounds of MtBE Plots of GWE system mass removal trends and influent <br />groundwater TPHg, benzene, and MtBE concentrations versus time are shown on Figures 4 and 5 <br />respectively Certified analytical reports and chain -of -custody documentation and GWE system <br />operation and maintenance field data sheets are included in Attachments 1 and 2, respectively <br />SYSTEM MODIFICATIONS <br />There were no system modifications during this reporting period <br />SUMMARY OF VIOLATIONS <br />There have been no violations of the discharge limitations during this reporting period <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 <br />Staff Geologist <br />Ln.av id <br />M Evans <br />Project Manager <br />11Chevron1957751Penodic Monitonng\O & WReportsWonthiy\Discharge Reports12002Wovember 2002 DR doc <br />