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GROUND ZERO ANALYSIS, INC. o _ <br /> ���11 Pi <br /> 1714 Main Street y, D <br /> Escalon,California 95320-1927 A� <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 FIVVI^ ? A��G} <br /> PERA✓et TIS',7LYES Tf, <br /> V/CApril 26, 2005 <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 2005 Groundwater Monitoring Report <br /> 640 N El Dorado Street, Stockton, California <br /> Dear Ms Duncan <br /> This letter report presents the results of the first quarter 2005 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> 10 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 MW 1 through MW7 and monitoring pH, temperature and electrical <br /> conductivity, <br /> • Collecting groundwater samples from wells MW 1 through MW7, <br /> • Analyzing groundwater samples for total petroleum hydrocarbons as gasoline (TPHg) and diesel (TPHd), <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX), and volatile organic compounds (VOCs), including <br /> oxygenated gasoline additives <br /> 2.0 FIELD WORK <br /> 21 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 20 <br /> feet on January 21, 2005 to a low 0 03 feet on March 3, 2005 The average thickness of measured product <br /> during the reporting period was 0 10 feet Approximately 3 13 gallons of product and product/water mixture <br /> were removed from well MW3 during the reporting period utilizing a passive skimmer and by manually <br /> bailing the product from the well, including 0 5 liters of oil from the skimmer <br /> G1GROUNDZEIGABBARDIreports\QMR1200511QM2005 doc <br />