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i� <br /> S <br /> 1 <br /> 1^� <br /> Coca-Cola Enterprises-West <br /> Job No. 90054.02 <br /> r calibrated Marine Moisture Control®(MMC)electronic interface probe. The electronic interface <br /> probe was decontaminated between measurements to reduce the possibility of potential cross- <br /> contamination. The decontamination process consisted of an initial wash in soap/tap water <br /> ii <br /> solution followed by a tap water rinse and two distilled water rinses. <br /> 2.2 GROUNDWATER ELEVATION RESULTS <br /> Groundwater elevations were calculated using a well head survey conducted by Mid-Valley <br /> t Engineering,Modesto,California. The survey consisted of level circuits carried from a City of <br /> 1 <br /> Stockton Datum Benchmark The accuracy of this survey was within 0.01 feet. <br /> The results of the groundwater elevation measurements collected by USTEC personnel are <br /> presented in Table 1. A summary of historical groundwater elevations are presented in Table <br /> 2. A groundwater contour map is presented in Figure 3. The groundwater flow is generally <br /> +>� towards the northeast, which is consistent with the initial monitoring of the wells after <br /> installation. <br /> 3.0 GROUNDWATER SAMPLING PROCEDURES <br /> Each of the six existing groundwater monitoring wells were sampled by USTEC personnel on <br /> December 6,1990. In order to minimize the risk of cross-contamination during the sampling <br /> program, work proceeded in order from the wells with the least contamination, as noted in <br /> previous monitoring programs,to wells with increasingly contaminated water. Each monitoring <br /> well was purged of at least five well volumes of water by using a decontaminated Grundfoslb <br /> purge pump. All water from the purging process was contained in Department of <br /> Transportation(DOT)approved 17H,55-gallon steel drums. These drums were stored on site <br /> .� pending completion of the analytical test results. <br /> R <br /> The groundwater samples were collected using a decontaminated 2-inch nominal diameter <br /> Teflon@ bailer. Groundwater was discharged directly from the bailer into two 40-milliliter VOA <br /> 2 <br /> 1 F <br /> Im <br />