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F r !4 <br /> 1 SECOR www secor corn <br /> IINTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C 0 R INCORPORATED Rancho Cordova,CA 95870 <br /> 918881-0400 TEL <br /> 918-881-0430 fAx <br /> May 26, 2004 <br /> Ms Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE Quarterly Groundwater Monitoring Report— First Quarter 2004 <br /> 76 (Former BP) Service Station No 11193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> SECOR Project Nos 77CP 60193 01 0001/77BP 50193 02 0436 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the first quarter <br /> 2004 groundwater-monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES— First Quarter 2004 <br /> • Performed groundwater monitoring and sampling of wells on March 8 and 9, 2004 <br /> • Weekly interim groundwater batch extraction performed by Onyx Industrial Services, Inc <br /> (Onyx) <br /> • Prepared and submitted quarterly groundwater monitoring report <br /> • Submitted work plan for vertical delineation of petroleum hydrocarbons <br /> PLANNED ACTIVITIES —Second Quarter 2004 <br /> • Perform quarterly groundwater monitoring and sampling <br /> • Prepare and submit quarterly groundwater monitoring report <br /> • Install Ozone Sparge System <br /> • Continue with weekly interim groundwater batch extraction until the Ozone Sparge System is <br /> activated <br /> • Perform additional off-site assessment for lateral delineation of the dissolved plume <br /> DISCUSSION <br /> On March 8 and 9, 2004, SECOR measured groundwater levels and collected groundwater samples <br /> from eleven wells (MWA R, 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 first quarter 2004, the direction of groundwater flow was east-northeasterly, at a hydraulic <br /> gradient of 0 001 foot per foot (ft/ft) Historical groundwater gradient data are presented in Table 2 <br /> Groundwater elevations increased by an average of 145 feet (ft) from the previous quarter Field <br /> procedures for groundwater monitoring are included in Attachment 1 Field data sheets showing <br /> recorded depth to groundwater levels are Included in Attachment 2 <br /> • <br /> 1 1ConocoF`hillips%Tosco Marketmg1111931QMR11 QMR04 Final doc <br />