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NOW <br /> Thrifty Oil Company#172 / ConocoPhillips page 2 <br /> 7647 Pacific Avenue, Stockton October 24, 2011 <br /> The EHD approved implementation of an interim remedial action (TRAP) in 2010 that was <br /> to utilize the onsite remedial equipment. Due to site construction schedule conflicts, the <br /> remediation equipment was removed and the IRAP was never enacted. Based on the <br /> elevated concentrations of petroleum in the soil and groundwater samples collected from <br /> the newly installed (replacement) monitoring wells, the EHD has concluded that <br /> remediation is needed to reduce the concentration of petroleum hydrocarbons remaining <br /> onsite, and that the site does not qualify for no further action/site closure at this time. <br /> Interim remedial action may be required until it can be determined that the extents of the <br /> contamination are delineated in the soil and groundwater and that the site has been <br /> adequately characterized. Please include a technical justification in the work plans why <br /> interim remedial action is not required at this time. <br /> The work plan/proposal to continue the required investigation is due on Geotracker by <br /> December 2, 2011. Questions regarding this letter should be directed to Michael Infurna, <br /> minfurna(a-)slcehd.coVor phoning (209) 468-3454. <br /> Michael J. Infurna Jr., R HS Nuel C. Henderson Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James L. Barton, Central Valley Regional Water Quality Control Board, <br /> Underground Storage Tank Unit, 11020 Sun Center Drive, #200, Rancho Cordova, <br /> CA 95670-6114 <br /> Mr. Kirk Larson, State Water Resources Control Board, Division of Cleanup Water <br /> Programs, Underground Storage Tank Program, PO Box 944212, Sacramento, CA <br /> 94244-2120 <br /> Mr. Louis Mosconi, ConocoPhillips, 3611 S. Harbor Blvd, #200, Santa Ana, CA <br /> 92704 <br /> Mr. Benjamin Chevlen, P.G., ATC Associates, 25 Cupania Circle, Monterey Park, <br /> CA 91755 <br />