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U_ <br />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 i 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 />Bob W. ckson Jr. <br />Staff Geologist <br />Q;&E:L_ <br />Project Engineer <br />1:\Chevron1957751Per1odic MonitoringkO & WReportsWonthlyTischarge ReportM20031April 2003 DR.revb.doc <br />