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f <br /> S E C 0 R <br /> . CHARACTERIZATION STATUS <br /> Contamination in soil has been adequately delineated TPPH and benzene have been <br /> delineated in groundwater both laterally and vertically MTBE has been delineated in <br /> groundwater laterally and vertically with the exception of delineation to the northwest in <br /> shallow groundwater <br /> CONCLUSION AND RECOMMENDATIONS <br /> Based on groundwater concentration vs time graphs provided by TRC, MTBE in the <br /> shallow zone has started to decrease or stabilize in all wells except MW-4 SECOR <br /> completed a soil vapor extraction (SVE) pilot test and submitted the results in the 3rd <br /> Quarter 2005 SECOR also recommends continued monitoring to verify contaminant <br /> concentration trends at the site <br /> RECENT SUBMITTALS/CORRESPONDENCE <br /> December 19, 2005 —Quarterly Status Summary Report— Third Quarter 2005 <br /> THIS QUARTER ACTIVITIES (Fourth Quarter 2005) <br /> 1 TRC performed quarterly groundwater monitoring and sampling <br /> 2 Submitted quarterly site status report <br /> • NEXT QUARTER ACTIVITIES (First Quarter 2006) <br /> 1 TRC to perform quarterly groundwater monitoring and sampling <br /> 2 Submit quarterly site status report <br /> 3 Prepare bench scale test for ozone sparging <br /> CONSULTANT <br /> SECOR International, Incorporated <br /> LIMITATIONS <br /> This report has been prepared for the exclusive use of ConocoPhillips and its <br /> representatives as it pertains to the property located at 8606 Thornton Road, Stockton, <br /> California The evaluation of subsurface conditions at the site for the purpose of this <br /> investigation is inherently limited due to the number of points of investigation There are <br /> no representations, warranties, or guarantees that the results are representative of the <br /> entire site Data from this report reflects the conditions at locations at a specified <br /> time No other interpretation, representations, warranties, guarantees, express or <br /> implied, are included or intended in the report findings <br /> • <br />