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S ECOR <br />Mr, Richard C. Prima Jr. <br />July 11, 2003 <br />Page 2 <br />The GWET system treated and discharged a total of 243,676 gallons of groundwater (Table 2) <br />during the reporting period. To date, the GWET system has treated and discharged a total of <br />7,104,669 gallons. Calculated discharge rates during this reporting period ranged from 4.16 to 5.84 <br />gallons per minute (gpm). <br />During this reporting period the GWET system extracted approximately 0.1 pounds of TPHg. To <br />date, the GWET system has extracted approximately 8.9 pounds of TPHg, 0.2 pounds of benzene, <br />and 84.9 pounds of MtBE. Plots of GWET system mass removal trends and influent groundwater <br />TPHg, benzene, and MtBE concentrations versus time are shown on Figures 4 and 5, respectively. <br />Certified analytical reports and chain -of -custody documentation and GWET system operation and <br />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 were no violations of the discharge limitations during this reporting period. <br />SECOR's request to reduce the compliance sampling frequency of the wastewater stream from <br />bimonthly to monthly was verbally approved during a phone conversation on June 25, 2003, between <br />Mike Schafer of the City and David Evans of SECOR. A reduction in the sampling frequency will be <br />included in the Discharge Permit effective in July of 2003. The City also requested a reduction in <br />discharge report submittals from monthly to quarterly. However, the City requested that certified <br />analytical reports be submitted monthly or within 30 days of the collection of samples. <br />Should you have any questions or require additional information, please feel free to contact David <br />Evans of SECOR at (916) 861-0400, extension 234. <br />Sincerely, <br />ternational Incorporated <br />S COR In <br />Karam Parmar <br />Staff Engineer <br />id M. Evans <br />Project Manager <br />k\Chevron1957751Periodic Monitoring\O & KReportsWonthiyTischarge Rsports12003Wune 2003 DR.doc <br />