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i <br /> i <br /> GROUND ZERO .ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,Telephone <br /> a (209 ma 95320-1927 <br /> Telephone (209)838-9$88 <br /> Faesumle (209)838-9883 <br /> OCT 242003 <br /> ENVIRONMENT V-E' .Jll <br /> October 23, 2003 PERMITJSERVâ–ºCES <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division j <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Third Quarter 2003 Groundwater Monitoring and Sampling Report <br /> Former M&K Market, 8960 West Walnut Grove Rd, Thornton, California <br /> i <br /> Dear Mr Knoll <br /> This letter report presents the results of the fluid quarter 2003 groundwater monitoring and <br /> sampling activities at the subject site (Figure 1) The report was prepared by Ground Zero Analysis, <br /> Inc (Ground Zero) 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 September 30, 2003 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 7 04 feet below the top of the well <br /> casing (btoc) in well MW6 to 9 54 feet btoc in well MW3 Groundwater elevations fell an average <br /> of 1 76 feet between June 26, 2003 and September 30, 2003 Groundwater generally flowed west <br /> G 1GROUNDZE\Barnyard-Manser\ReportslQMR1200313QM2003 doc <br />