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F' 1 <br /> SECOR www secor coin <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E (_ ® R INCORPORATED Rancho Cordova,CA 95670 <br /> s <br /> 916-861-0400 TEL <br /> 916 861-0430 FAx <br /> D <br /> January 29, 2004 ��0 <br /> JAN 3 0 2004 <br /> ENVIRONMENT ht:ALTH <br /> Ms Vicki McCartney <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE Quarterly Groundwater Monitoring Report--Fourth Quarter 2003 <br /> ConocoPhillips (Former BP) Station No 11193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> SECOR Project Nos 77CP 60193 00 0002/77BP 50193 00 0436 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the fourth quarter <br /> 2003 groundwater-monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES — Fourth Quarter 2003 <br /> • Performed groundwater monitoring and sampling of wells on December 15, 2003 <br /> • Weekly interim groundwater batch extraction performed by Onyx Industrial Services, Inc <br /> (Onyx) <br /> • Prepared and submitted quarterly groundwater monitoring report <br /> • San Joaquin County Environmental Health Department (SJCEHD) approved SECOR's <br /> Revised Interim Remedial Action Plan, Work Plan for Ozone Sparge Well Installation, and <br /> Additional Off-Site Assessment, dated September 15, 2003 <br /> PLANNED ACTIVITIES — First Quarter 2004 <br /> • Perform quarterly groundwater monitoring and sampling <br /> • Prepare and submit quarterly groundwater monitoring report <br /> • Continue with weekly interim groundwater batch extraction performed by Onyx until Ozone <br /> Sparge Wells and Ozone Sparge System are installed and activated <br /> • Perform additional off-site assessment for lateral delineation of the dissolved plume <br /> • Submit work plan for vertical delineation of petroleum hydrocarbons <br /> DISCUSSION <br /> On December 15, 2003, SECOR measured groundwater levels within and collected groundwater <br /> samples from eleven wells (MW-1R, MW-2R, MW-3 through MW-10, and VW-1) Depth to water <br /> measurements and calculated groundwater elevation data are included in Table 1 Groundwater <br /> elevation data were used to construct a potentiometric surface map, which is included as Figure 1 <br /> During the fourth quarter 2003, the direction of groundwater flow was determined to the northeast, at <L <br /> a hydraulic gradient of 0 001 foot per foot (ft/ft) Historical groundwater gradient data are presented <br /> in Table 2 Groundwater elevations decreased by an average of 0 21 foot (ft) from the previous 4,n <br /> . quarter Field procedures for groundwater monitoring are included in Attachment 1 Field data <br /> sheets showing recorded depth to groundwater levels are included in Attachment 2 <br /> 1 <br /> t� <br /> 7 <br /> i IConocoPhdlips\Tosco Marketmg1111931QMR140MR03 Final doc ; <br /> t <br /> s <br />