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1 <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Fscalon,California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> June 8, 2004 <br /> Ms Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject First 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 first 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 <br /> electrical conductivity, <br /> • Collecting groundwater samples from wells MW1 through MW7, <br /> • Analyzing groundwater samples for total petroleum hydrocarbons as gasoline (TPHg) and diesel <br /> (TPHd), benzene, toluene, ethylbenzene, and xylenes (BTEX), and volatile organic compounds <br /> (VOCs), including oxygenated gasoline 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 <br /> the reporting period The thickness of measured product during the reporting period ranged from a <br /> high of 0 19 feet on March 3, 2004 to 0 03 ft on March 9, 2004 The average thickness of measured <br /> • product during the reporting period was 0 12 feet Approximately 7 3 gallons of product and <br /> product/water mixture was removed from well MW3 during the reporting period utilizing a passive <br /> G 1GROUNDZEIGABBARDIrcportslQMR1200411QM2004 doc <br />