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S E C O R <br /> Richard C Prima Jr <br /> May 15, 2003 <br /> Page 2 <br /> 6,532,724 gallons Calculated discharge rates during this reporting period ranged from 6 69 to 6 80 <br /> gallons per minute (gpm) <br /> During this reporting period the GWET system extracted approximately 0 1 pounds of TPHg and 0 1 <br /> pounds of MtBE To date, the GWET system has extracted approximately 8 8 pounds of TPHg, 0 2 <br /> Pounds of benzene, and 84 8 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 the continued decline of influent hydrocarbon concentrations, and the continued <br /> compliance with City discharge limitations, SECOR recommends that <br /> • GAC change-outs not be performed bi-annually, but only as necessary to prevent <br /> violations <br /> Should you have any questions or require additional information, please feel free to contact Bob <br /> Jackson of SECOR at (916) 861-0400, extension 283 <br /> Sincerely, <br /> SECOR International Incorporated <br /> Oob ckson Jr David M Evans <br /> Staff Geologist Project Engineer <br /> i <br /> 11Chevron1957751Penodio MonitonngNO&M ileportsWonthlyUscharge Reports120031Apnl 2003 DR revb doc <br />