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Coca-Cola Enterprises - West <br /> Job No. 90054.03 <br /> Groundwater measurements were collected and measured to the nearest 0.01 feet using a <br /> calibrated Marine Mosture 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 was in Alconox®/distilled <br /> y: <br /> i water solution followed by three distilled water rinses. <br /> i <br /> 2.2 GROUNDWATER ELEVATION RESULTS <br /> Groundwater elevations were calculated using a well head survey conducted by Mid-Valley <br /> Engineering,Modesto,California. The survey consisted of level circuits carried from a City of <br /> l ;A Stockton Datum Benchmark. The accuracy of this survey was within 0.01 feet. The results of <br /> i <br /> the groundwater elevation measurements collected by USTEC personnel are presented in Table <br /> F <br /> 1. A summary of historical groundwater elevations are presented in Table 2. <br /> i <br /> an average of 0.37 feet from December 1,1990 to March 1, <br /> The depth to groundwater increased <br /> 1991. Groundwater elevation ranged from-52.15 in MW-3 to -52.45 in MW-6. A groundwater <br /> 3 <br /> ed on Figure 3. The groundwater flow is generally towards the <br /> elevation contour map is present <br /> i <br /> northeast,and is consistent with previous monitoring results. <br /> a { <br /> 4 <br /> Ikyi <br /> i <br /> ^' <br /> 3.0 GROUNDWATER SAMPLING PROCEDURES <br /> The six existing groundwater monitoring wells were sampled by USTEC personnel on March 18 <br /> and 19,1991. In order to minimize-the risk of cross-contamination during the sampling program, <br /> er from the wells with the least contamination,as noted in the previous <br /> work proceeded in ord <br /> quarterly monitoring, to wells with increasingly contaminated w "cr. <br /> Each monitoring well was purged of at least three well volumes of water by Blaine Tech Services <br /> using a decontaminated Grundfos® purge pump. The specific pH, conductivity, and <br /> temperature were monitored during the purge process. All water from the purging process was <br /> contained in DOT-17H, 55-gallon steel drums. These drums were stored on <br /> pending <br /> q L✓ 2 <br /> 4 i.l <br /> Vim - <br />