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S E C O R <br /> Quarterly Remedial Performance Summary <br /> May 4, 2004 <br /> Page 2 <br /> Conclusions and Recommendations <br /> Despite intermittent operation, hydrocarbon concentrations in groundwater samples have decreased. <br /> SECOR recommends continuing operation of the ozone injection system. <br /> If you have any questions, please contact us at (916) 861-0400. <br /> Sincerely, <br /> SECOR International Incorporated <br /> ZVZ--- B 0 <br /> Amy Draffan <br /> Staff Engineer C 0683 " <br /> * F.q.12/31/06 <br /> �9 CIVIL �� <br /> Rusty E. Benkos y, P.E. p�CAl-WC <br /> Senior Engineer <br /> Attachments: Figure 1 —Site Plan <br /> Attachment A—Quarterly Remedial Performance Summary— First Quarter 2004 <br /> Attachment B— Field Data Sheets <br /> Attachment C—Certified Analytical Reports and Chain of Custody Documentation <br /> cc: Mr. James Barton, California Regional Water Quality Control Board, Central Valley Region <br /> Mr. Mike Infurna, San Joaquin County Environmental Health Department <br /> RB/ad <br /> 'S <br /> 1:IConocoPhi11ipslTosco Marketing1111951QRPS111195 1 Q04 QRPS.doc SECOR International incorporated <br />