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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> cry <br /> October 22, 2001 k <br /> Mr Harlin Knoll = <br /> San Joaquin County Public Health Services <br /> Environmental Health Division 4� <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Quarterly Groundwater Monitoring Report <br /> July 1, 2001 through September 30, 2001 <br /> Knowles Property, 1140 W Hammer Lane, Stockton, California <br /> Dear Mr Knoll <br /> This report summarizes activities at the subject site (Figure 1) during the period July 1, 2001 <br /> through September 30, 2001 Activities during the third quarter included monitoring depth to <br /> water in all site wells, purging and sampling wells MW through MW5, and well MW8, analyzing <br /> samples for benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum <br /> hydrocarbons as gasoline (TPHg), and destroying groundwater monitoring wells MW6, MW7, <br /> MW8 <br /> GROUNDWATER MONITORING AND SAMPLING <br /> A Ground Zero technician measured the depth to groundwater in each site well on August 6, <br /> 2001 The depth to groundwater beneath the site ranged from 34 49 feet below ground surface <br /> (bgs) in well MW3 to 36 41 feet bgs in well MW6 Groundwater elevations in site wells fell an <br /> average of 4 01 feet between May 22, 2001 and August 6, 2001 The water table beneath the site <br /> lies above the screened intervals in wells MW4 through MW8 Groundwater flow in the vicinity <br /> of the former USTs was toward the east-southeast with a gradient of 0 005 to 0 007, or <br /> approximately 26 to 37 feet per mile Monitoring well construction details are summarized in <br /> Table l and groundwater monitoring data are summarized in Table 2 A potentiometric surface <br /> map for August 6, 2001 is presented on Figure 2 <br /> i <br /> Knowles ham/reports/2gm2001 doe <br />