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SECOR www setor com <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> ® <br /> INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> 91661-0430 Fax <br /> October 21, 2003 a) "� <br /> Ms Vicki McCartney J <br /> San Joaquin County Environmental Health Department tip" I\_N 1, -03 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE Quarterly Groundwater Monitoring Report—Third Quarter 2003 <br /> ConocoPhillips (Former BP)Station No 11193 <br /> 3202 West Hammer Lane 7� <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 third quarter <br /> 2003 groundwater-monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES—Third Quarter 2003 <br /> • Performed groundwater monitoring and sampling of wells on September 2, 2003 <br /> • Weekly interim groundwater batch extraction performed by Onyx Industrial Services, Inc <br /> .1 (Onyx) <br /> • Prepared and submitted quarterly groundwater monitoring report <br /> • Prepared and submitted "Revised Interim Remedial Action Plan and Work Plan for Ozone <br /> Sparge Well Installation and Additional Off-site Assessment,"dated September 15, 2003 <br /> PLANNED ACTIVITIES —Third Quarter 2003 <br /> • Perform quarterly groundwater monitoring and sampling in <br /> • Prepare and submit quarterly groundwater monitoring report <br /> • Continue with weekly interim groundwater batch extraction performed by Onyx until approval <br /> of revised Interim Remedial Action Plan <br /> • Perform additional assessment <br /> DISCUSSION <br /> On September 2, 2003, SECOR measured groundwater levels within and collected groundwater <br /> samples from eleven wells (MW-IR, 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 third quarter 2003, the direction of groundwater flow was determined to the northeast, at a <br /> hydraul[cyradient of 0 001 foot per foot (ft/ft) Historical groundwater gradient data are presented in <br /> Table 2 Groundwater elevations decreased by an average of 0 786 foot (ft) from the previous <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 /> 11ConocoPhillipslTosco Marketmg1111931QMR13QMR03 Final doc <br />