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Fourth Quarter,2002 Quarterly Groundwater Monitoring Report <br /> Eckert Cold Storage,Manteca,California <br /> January 10,2003 <br /> Page 3 <br /> .. ." groundwater gradient was 0.00176 ft,/ft. towards the northwest, as shown. Groundwater elevation data for <br /> December 9, 2002 are presented in Table.1,below. <br /> Table 1 -Groundwater Elevation Data (December 9, 2002) <br /> Monitoring Scteened interval(bgs) TOG Elevation Depth To Water Groundwater <br /> Well ' Elevation <br /> MW-1 13 -28 38.09 18.42 19.67 <br /> MW-2 15 -30 37.90 18.19 19.71 <br /> MW-3 15 -30 38.31 ;18.64 19.67 <br /> MW-4 12-27 37.84 18.42 19.42 i <br /> MW-5 14-34 41.22 21.63 19.59 <br /> MW-6 13 -33 37.65 17.95 19.70 <br /> MW-7 13 -33 38.22 18.49 19.73 <br /> MW-817—37" 37.76 18.12 19.64 <br /> TOC Elevation:Elevations are measured from the top of the well casing and are referenced to NGS Benchmark HS4486,elevation 35"03 feet <br /> 1 using NAVD 88 datum. <br /> All measurements are in feet. <br /> LABORATORY,ANALYTICAL RESULTS <br /> a. The groundwater samples collected from monitor wells MW 1, MW-3 through MW-8, and domestic well <br /> DW-1 were analyzed for BTEX, TPH-G, and selected gasoline oxygenates/additives including MTBE by <br /> �~ Argon Laboratories of Ceres, California. MW-2 was not sampled as damage to the well casing during <br /> ]" installation of the well prevents placement of bailers and pumps down the well. <br /> The current laboratory analytical results, shown in Table 2, on the following page, are generally <br /> 1 consistent with historical laboratory analytical results. Historical groundwater monitoring data is included <br /> in Attachment C, Laboratory certificates of analyses and the chain-of-custody for the samples are <br /> included in Attachment D. <br /> j: <br /> F <br /> E <br /> F <br /> t . <br /> 5 <br /> I <br /> 3 " <br /> i.�i CONDOR <br />