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1R1 � <br /> GROUND ZERO ANALYSIS, INC. <br /> • 1714 Main Street <br /> EscaloTelephone <br /> , e (209)8 -9888 1927 ME) <br /> Tele hone 209 838-)$88 D <br /> Facsimile (209)838-9883 <br /> JAN 2 5 2002 <br /> January 24, 2002 <br /> ENVIRONMENTliv Itis <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 Fourth 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 fourth 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) <br /> FIELDWORK <br /> Groundwater Monitoring and Sampling <br /> On December 31, 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 51 15 to 51 98 feet below <br /> ground surface (bgs) and the potentlometric surface elevation ranged from 30 88 to 30 90 feet below <br /> mean sea level Groundwater rose an average of 5 80 feet since last measured on September 24, 2001 <br /> and flowed radially from the area east of well MW 1 with no definitive bearing The average hydraulic <br /> gradient at the site was approximately 0 0004 ft/ftA potentiometnc surface map generated using the <br /> December 31, 2001 monitoring data is shown on Figure 2 Groundwater monitoring data are <br /> summarized in Table 1 Monitoring data sheets are included in Attachment A <br /> HanysVepDAs%gnw\4ym2001 doc <br />