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• GROLwD ZERO ANALYSIS, INC. JAN 2 6 2004 <br /> 1714 Maul street ENVIRONMENT HEALTH <br /> F.sealon, CaUorma 95320-1927 PERMIT/SERVICES <br /> Telephone (209)838-9588 <br /> Facsimile (209)838-9883 <br /> January 23, 2004 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Groundwater Monitoring and Sampling Report <br /> Former M&K Market, 8960 West Walnut Grove Rd, Thornton, California <br /> Dear Mr Knoll <br /> • This letter report presents the results of recent groundwater monitoring and sampling activities at <br /> the subject site (Figure 1) The report was prepared by Ground Zero Analysis, Inc (Ground Zero) <br /> on behalf of the Barnyard Corporation <br /> 1.0 SITE ACTIVITIES <br /> Groundwater was monitored, purged and sampled in all site wells Samples collected from wells <br /> MW through MW7 were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX), 1,2-dichloroethane (1,2-DCA), ethylene dibromide <br /> (EDB), and oxygenated gasoline additives <br /> 2.0 FIELDWORK <br /> 2.1 Groundwater Monitoring and Sampling <br /> An experienced Ground Zero field technician monitored and sampled wells MW1 through MW7 <br /> on January 6, 2004 Groundwater elevations were calculated by measuring the depth to <br /> groundwater in each well, and subtracting the measured value from the respective wellhead <br /> elevation The depth to groundwater in the wells ranged from 5 73 feet below the top of the well <br /> casing (btoc) in well MW6 to 8 55 feet btoc in well MW1 Groundwater elevations rose an average <br /> of 107 feet between September 30, 2003 and January 6, 2003 Groundwater generally flowed <br /> 0 IGROUNDZE1Bamyard-ManserlReportslQMR1200314QM2003 doc <br />