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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> ESldlOn, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Falsimile (209)838-9883 <br /> December 14, 2001 13F 1 7 M1 <br /> ENVIkI,j1iMLNTA� 1-4EAL�H <br /> Ms Lori Duncan <br /> PERMIT/SERVICES <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Quarterly Groundwater Monitoring Report,3"' Quarter 2001 <br /> 640 N El Dorado Street, Stockton, California <br /> Dear Ms Duncan <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 momtonng water level elevations, purging and sampling groundwater <br /> from site wells, removing free product from well MW3, and analyzing groundwater samples for total <br /> petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), total <br /> recoverable petroleum hydrocarbons (TRPH), benzene, toluene, ethylbenzene, total xylenes (BTEX), <br /> oxygenated gasoline additives, volatile organic compounds (VOC), and dissolved lead <br /> FIELD WORK <br /> Groundwater Monitoring <br /> Monitoring wells MW 1 through MW4 were monitored and wells MW 1, MW2 and MW4 sampled on <br /> September 21, 2001 No samples were collected from well MW3 due to the presence of free product <br /> Groundwater elevations were calculated by subtracting the measured depth to groundwater in each <br /> well from the respective wellhead elevation The depth to groundwater in the wells on September 21, <br /> 2001 ranged from 22 88 to 23 47 feet below ground surface (bgs) Groundwater flow was in a <br /> northeast direction with a varying gradient A potentiometric surface map generated using the <br /> September 21, 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 /> G1Data1GROUNDZEIGABBARDIreportsl3QM2001 do(, <br />