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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> August 27, 2003 - AU G 2 8 2003 <br /> ENVIRORMENT HEALTH <br /> Ms Lori Duncan <br /> PERMIT/SERVICES <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Second Quarter 2003 Groundwater Monitoring Report <br /> 640 N EI Dorado Street, Stockton, California <br /> Dear Ms Duncan <br /> This letter report presents the results of second quarter 2003 groundwater monitoring and sampling activities <br /> 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 /> Drilling and installing wells MW5 through MW7, <br /> • Monitoring water level elevations in all site wells, <br /> • Developing wells MW5, MW6, and MW7 and monitoring pH, temperature, electrical conductivity, and <br /> turbidity of groundwater, <br /> • Purging wells MWI, MW2, and MW4 and monitoring pH, temperature and electrical conductivity of <br /> groundwater, <br /> • Collecting groundwater samples from wells MWI,MW2, MW4,MW5, MW6, and MW7, <br /> • Analyzing groundwater samples for volatile organic compounds (VOCs), oxygenated gasoline additives, <br /> total petroleum hydrocarbons as gasoline(TPHg),total petroleum hydrocarbons as diesel (TPHd), benzene, <br /> toluene, ethylbenzene,xylenes(BTEX)and total recoverable petroleum hydrocarbons(TRPH), <br /> • Removing waste generated from site activities <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 low of 0 18 <br /> feet on May 19, 2003 to a high of 0 60 feet on April 21, 2003 The average measured product thickness <br /> G\GROUNDZE\GABBARD\reports\QMR\2003\2QM2003 doc <br />