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GROUND ZERO ANALYSIS, INC. o �En <br /> lJJ <br /> 1714 Main Street <br /> Escalon,California 95320-1927 13 2003 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> February 5, 2003 <br /> Ms Lon Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter 2002 Groundwater Monitoring Report <br /> 640 N El Dorado Street, Stockton, California <br /> Dear Ms Duncan <br /> This letter report presents the results of fourth quarter 2002 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> 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 wells MW I, MW2, and MW4 and monitoring pH, temperature and electrical conductivity of <br /> groundwater, <br /> • Collecting groundwater samples from wells MWl, MW2, and MW4, <br /> • Analyzing groundwater samples for total petroleum hydrocarbons as diesel (TPHd), total petroleum <br /> hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), and volatile <br /> organic compounds (VOCs) including oxygenated gasoline additives, <br /> • Removing liquid waste generated during site activities <br /> FIELD WORK <br /> Free Product Measurement and Recovery <br /> A Ground Zero technician measured and removed free product from well MW3 periodically during <br /> the reporting period The thickness of measured product ranged from 0 77 feet on October 1, 2002 <br /> 0\GROUNDZE\CABBARD\reportsWQM2002 doc <br />