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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street F f L 7 <br /> Escalon, California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> February 23, 2001 <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 Quarterly Groundwater Monitoring Report, <br /> October 1, 2000 through December 31, 2000 <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 October 1, 2000 <br /> • through December 31, 2000 Activities during the quarter included monitoring depth to water in all <br /> site wells, purging and sampling wells MW1, MW4, MW5, and MW8, and analyzing samples for <br /> benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons as gasoline <br /> (TPHg) <br /> GROUNDWATER MONITORING ANIS SAMPLING <br /> An experienced Ground Zero technician measured the depth to groundwater m each site well on <br /> November 14, 2000 The depth to groundwater beneath the site ranged from 32 99 feet below ground <br /> surface(bgs) In well MW3 to 35 07 feet bgs in well MW6 Groundwater elevations rose an average of <br /> 0 89 feet between August 10, 2000 and November 14, 2000 The water table beneath the site lies <br /> above the screened intervals in all wells except MW3 Monitoring well construction details are <br /> summarized in Table 1 Groundwater monitoring data are summarized in Table 2 <br /> The groundwater flow beneath the site was somewhat irregular in November 2000 However, in the <br /> vicinity of the former UST's the flow was generally southeast at gradient of 0 007 ft/ft, or <br /> approximately 37 ft/mile A potentiometric surface map for November 14, 2000 is presented on <br /> Figure 2 <br /> Monitoring wells AM I, MW4, MW5, and MW8 were sampled on November 14, 2000 A minimum <br /> of three well casing volumes of water were purged from each well prior to sampling The temperature, <br /> specific conductance, and pH of the water were measured and recorded while each well was purged of <br /> the required volume Purged groundwater was placed in labeled drums approved for storage of liquid <br /> waste by the Department of Transportation (DOT) pending disposal Copies of field purge logs and <br /> water level measurements are included in Attachment A <br /> Knowles hanVrepoftw3gn2W0 doc <br />