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1 I� <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> t� <br /> October 12, 2001 -- <br /> r� <br /> Mr Jeff Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health division N <br /> 304 East Weber Avenue, Third Floor p <br /> Stockton, CA 95202 N <br /> Subject Third Quarter Groundwater Monitoring and Sampling Report, <br /> Speedy Mart, 8200 N Highway 99, Morada, CA <br /> Dear Mr Wong <br /> This letter report summarizes 3'-' Quarter 2001 groundwater monitoring and sampling activities at the <br /> subject site (Figure 1) <br /> 1.0 SITE ACTIVITIES <br /> Activities at the site included monitoring groundwater levels in all site wells, purging and sampling <br /> groundwater from site wells, and initiating free product removal from well MW 1 Groundwater samples <br /> were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX), oxygenated gasoline additives, 1,2-dichloroethane (1,2-DCA), and ethylene dibromide <br /> (EDB) <br /> 2.0 FIELD WORK <br /> 2.1 Groundwater Monitoring and Sampling <br /> On August 15 and 16, 2001, an experienced Ground Zero technician monitored water levels in wells <br /> MW 1 through MW9B, and sampled monitoring wells MW2 through MW9B No sample was collected <br /> from well MW 1 due to the presence of free product in the well <br /> Groundwater elevations were calculated by measuring the depth to groundwater in each well and <br /> subtracting the measured depth from the respective well head elevation The measured depth to <br /> groundwater beneath the site ranged from 6149 to 62 19 feet below the tops of the well casings <br /> Groundwater elevations at the site ranged from 30 35 feet (MW2) to 30 86 feet (MW4) below mean sea <br /> G\Data1GROUNDZF1TULFBURGW.portslQMR\3QM2001 doc, <br /> r; <br />