Laserfiche WebLink
J)rt r{ <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 /> August 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 /> Subject Quarterly Groundwater Monitoring Report <br /> April 1, 2002 through June 30, 2002 <br /> Knowles Property, 1140 W Hammer Lane, Stockton, CA <br /> Dear Mr Knoll <br /> This report summarizes activities at the subject site (Figure 1) during the period April 1, 2002 <br /> through June 30, 2002 Activities during the reporting period included monitoring depth to <br /> water in all site wells, purging and sampling wells MW1, MW4, and MW5, and analyzing <br /> samples for benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum <br /> hydrocarbons as gasoline (TPHg) <br /> SITE ACTIVITIES <br /> Groundwater Monitoring and Sampling <br /> A Ground Zero technician measured the depth to groundwater in each site well on May 21, <br /> 2002 The depth to groundwater beneath the site ranged from 31 83 feet below ground surface <br /> (bgs) in well MW3 to 33 42 feet bgs in well MW2 Groundwater elevations in site wells fell <br /> an average of 0 11 feet between February 8, 2002 and May 21, 2002 The water table beneath <br /> the site lies above the screened intervals in wells MW1, MW2, MW4 and MW5 <br /> Groundwater flow was east-northeasterly at gradient of 0 0014 or approximately 7 4 feet per <br /> mile Monitoring well construction details are summarized in Table 1 and groundwater <br /> monitoring data are summarized in Table 2 A potentiometric surface map for May 21, 2002 <br /> . is presented on Figure 2 <br /> G 0ata1GR0UNDZF-\KN0WLES HAM\REP0R=QMR12QM2002 doc <br />