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GROUND ZERO ANALYSIS, INC. <br /> .4 1714 Main Street <br /> ' Escalon,California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 RECEIVED <br /> November 10,2004 <br /> NOV 15 2004 <br /> EWRONMENT HEALTH <br /> PERMIT/SERIES <br /> Ms Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Third Quarter 2004 Groundwater Monitoring Report <br /> 640 N El Dorado Street, Stockton, California <br /> Dear Ms Duncan <br /> This letter report presents the results of the third quarter 2004 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> 1.0 SITE ACTIVITIES <br /> Activities at the site included <br /> • Removing free product from well MW3, <br /> Monitoring water level elevations in all site wells, <br /> • Purging groundwater from wells MW1 through MW7 and monitoring pH, temperature and electrical <br /> conductivity, <br /> Collecting groundwater samples from wells MW1 through MW7, <br /> i <br /> + Analyzing groundwater samples volatile organic compounds (VOCs), including oxygenated gasoline <br /> additives <br /> 2.0 FIELD WORK <br /> 2.1 Free Product Measurement and Recovery <br /> A Ground Zero technician measured and removed free product from well MW3 periodically during the <br /> reporting period The thickness of measured product during the reporting period ranged from a high of 0 38 <br /> feet on August 17, 2004 to 0 18 ft on September 7, 2004 The average thickness of measured product during <br /> the reporting period was 0 27 feet Approximately 7 gallons of product and product/water mixture was <br /> removed from well MW3 during the reporting period utilizing a passive skimmer and by manually bailing <br /> the product from the well <br /> G 1GRpUNDZEIGABSARDIieportslQMR1200413QM2004 doe r <br />