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1 <br /> 1 GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street D <br />' Escalon, California 95320 ME Effgu <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 SEP 2 Se 2005 <br />' ENVfRONMENT (DEALT" <br /> PERMIT/SERVICES <br />' September 27, 2005 r,r <br />' Ms Vicky McCartney �e a -0 <br /> a <br /> San Joaquin County Environmental Health Department cr r f- <br /> 304 E Weber Ave , Third Floor <br />' Stockton, CA 95202 <br /> .d�•� <br /> Subject Second Semi-Annual 2005 Groundwater Monitoring and Sampling Report <br />' and Request for Case Closure <br /> H&H Engineering and Construction Facility, 212 Industrial Drive, Stockton, CA <br /> Dear Ms McCartney <br />' This letter report summarizes the results of the second semi-annual 2005 groundwater monitoring <br /> and sampling activities at the subject site and presents data in support of a request for case <br /> closure A site location map is presented on Figure 1 <br /> Site Activities <br /> Activities at the site included monitoring water level elevations, and purging and sampling <br /> groundwater from all site wells Groundwater samples were analyzed for benzene, toluene, <br /> Iethylbenzene and total xylenes (BTEX), total petroleum hydrocarbons as gasoline (TPHg), 1,2 <br /> dichloroethane (1,2-DCA), ethylene dibromide (EDB), and gasoline oxygenate additives [methyl- <br /> tert-butyl ether (MTBE), ethyl-tert-butyl ether (ETBE), di-isopropyl ether (DIPE), tert-amyl <br /> methyl ether (TAME) and tort-butyl alcohol (TBA)] A site pian showing monitoring well <br /> Iocations is presented on Figure 2 <br /> IGroundwater Monitoring and Sampling <br /> On August 19, 2005 monitoring wells MW 1 through MW3 were monitored and sampled <br /> Groundwater elevations were calculated by measuring the depth to groundwater in each well and <br /> subtracting from the respective wellhead elevation Groundwater elevations at the site fell an <br /> average of 3 51 feet since last monitored on March 31, 2005 The average hydraulic gradient <br /> across the site was approximately 0 014 ft/ft (74 feet per mile) Groundwater flowed in a <br /> northeasterly direction - A potentiometric surface map is depicted on Figure 3 Groundwater <br /> monitoring data are summarized in Table 1 Monitoring data sheets are included in Appendix A <br /> I <br /> G 1GR0UNDZEIW-EISAR1200512SAR05 doc <br />