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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street i <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> r <br /> F'a0.11nile (209)838-9883 <br /> a <br /> October 15, 2001 , <br /> CP ,= <br /> Mr Jeffrey Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Third Quarter 2001 Groundwater Monitoring and Sampling Report <br /> Former Harry's Auto Mart <br /> 2662 N Wilson Way, Stockton, CA(Site Code 1306) <br /> Dear Mr Wong <br /> • This letter report presents the results of the third quarter 2001 groundwater monitoring and sampling <br /> activities at the subject site (Figure 1) <br /> SITE ACTIVITIES <br /> Activities at the site included monitoring water level elevations, purging and sampling groundwater <br /> from site wells, and analyzing samples for total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX), gasoline oxygenate additives, 1,2-dichloroethane (1,2- <br /> DCA), and ethylene dibromide (EDB) The wellhead elevation of U-Haul monitoring well MW7 was <br /> also surveyed and tied into the Harry's Auto Site well network <br /> FIELD WORK <br /> Groundwater Monitoring and Sampling <br /> On September 24, 2001, wells MW1 through MW4 were monitored and sampled Groundwater <br /> elevations were calculated by measuring the depth to groundwater in each well and subtracting from <br /> the respective wellhead elevation Depth to water in the wells ranged from 56 96 to 57 67 feet below <br /> ground surface (bgs), and the potentnometnc surface ranged from 36 67 to 37 71 feet below mean sea <br /> • level Groundwater fell an average of 8 33 feet since last measured on June 12, 2001 and flowed <br /> radially from the area east of well MW 1 with no definitive bearing The average hydraulic gradient at <br /> the site was approximately 0 001 ft/ft <br /> }141Tyslrepor1.slgmr13gm2001 doe <br />