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GROUND ZERO ANALYSIS, INC. <br /> i sear <br /> 1714 Main Street 01 1 t +4 <br /> Escalon, California 95320-1927 `��� ti 2 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> ' <br /> Jf - <br /> July 10, 2001 klll� ev <br /> Mr Jeffrey Wong <br /> San Joaquin County Public Health Services I <br /> Environmental Health division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Second 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 second 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 ethylenedibromide (EDB) <br /> FIELD WORK <br /> Groundwater Monitoring and Sampling <br /> On June 12, 2001, wells MW1 through MW4 were monitored and sampled Groundwater elevations <br /> were calculated by measuring the depth to groundwater in each well and subtracting from the <br /> respective wellhead elevation Depth to water in the wells ranged from 48 66 to 49 22 feet below <br /> ground surface (bgs), and the potentiometnc surface ranged from 28 22 to 28 44 feet below mean sea <br /> level Groundwater fell an average of 2 93 feet since last measured on February 9, 2001, and flowed <br /> radially from well MW 1 with no definitive bearing An apparent mound appears to have developed in <br /> this location The average hydraulic gradient at the site was approximately 0 005 ft/ft A <br /> �j potentiometric surface map generated using the June 12, 2001 monitoring data is shown on Figure 2 <br /> Groundwater monitoring data are summarized in Table 1 Monitoring data sheets are included in <br /> Attachment A <br /> Hury%\re ortsl mrl� m2N)1 doe <br /> P 9 9 <br />