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i <br /> I GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> I <br /> February 20, 2002 <br /> Mr Harlin Knoll <br />' San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> I <br /> Subject Quarterly Groundwater Monitoring Report <br /> October 1, 2001 through December 31, 2001 <br /> Knowles Property, 1140 W Hammer Lane, Stockton, California <br /> IDear Mr Knoll <br /> This report summarizes activities at the subject site (Figure 1) during the period October 1, 2001 <br /> through December 31, 2001 Activities during the fourth quarter included monitoring depth to <br /> water in all site wells, purging and sampling wells MW 1, MW4, and MWS, and analyzing samples <br /> for benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons as <br /> gasoline (TPHg) <br /> IGROUNDWATER MONITORING AND SAMPLING <br /> A Ground Zero technician measured the depth to groundwater in each site well on November 9, <br /> 2001 The depth to groundwater beneath the site ranged from 34 67 feet below ground surface <br /> (bgs) in well MW3 to 36 28 feet bgs in well MW2 Groundwater elevations in site wells fell an <br /> average of 0 21 feet between August 6, 2001 and November 9, 2001 The water table beneath <br /> the site lies above the screened intervals in wells MW4 and MW5 Monitoring well construction <br /> details are summarized in Table 1 and groundwater monitoring data are summarized in Table 2 <br /> Groundwater flow in the vicinity of the former USTs was toward the southeast with a gradient of <br /> 0 006 or approximately 33 feet per mile A potentiometric surface map for November 9, 2001 is <br /> Ipresented on Figure 2 <br /> I <br /> i <br /> IKnowles hamlrepom-J4gm2001 doe <br />