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wa <br /> I : <br /> IW11 <br /> NO <br /> F <br /> Coca-Cola Enterprises-West <br /> r j USTEC Job No.90054.03 <br /> 2,1 GROUNDWATER ELEVATION MEASUREMENT PROCEDURES <br /> j The groundwater monitoring activities were performed by USTEC personnel on August 22,1991. <br /> 4}r The monitoring procedures measured the static groundwater elevation and sampled the <br /> groundwater at each of six groundwater monitoring wells located at the site. The locations are <br /> w <br /> } shown on Figure 2. <br /> 17 Each of the six groundwater monitoring wells were measured for depth to groundwater and <br /> { <br /> groundwater table elevations (referenced to mean sea level) on August 22, 1991. Groundwater <br /> measurements were collected and measured to the nearest 0.01 feet using a calibrated Marine <br /> Moisture Control® (MMC) electronic interface probe. The electronic interface probe was <br /> i—I decontaminated between measurements to reduce the possibility of potential cross <br /> contamination. The decontamination process consisted of an initial wash in Tri-Sodium <br /> Phosphate(TSP) and tapwater solution followed by two distilled water rinses. <br /> I <br /> 2.2 GROUNDWATER ELEVATION RESULTS <br /> p- i re calculated using a well head survey conducted by Mid-Valley <br /> Groundwater elevations we g <br /> 1. f_1 Engineering,Modesto,California. The survey consisted of level circuits carried from a City of <br /> Stockton Datum Benchmark. The accuracy of this survey was within 0.01 feet. Che results of <br /> the groundwater elevation measurements collected by USTEC pe--sonnel are presented in Table <br /> s <br /> 1. A summary of historical groundwater elevations are presented in Table 2. <br /> The groundwater elevation decreased an average of 1.5 feet from May 22, 1991 to August 22, <br /> 1991. Groundwater elevations ranged from-53.48 in MW-3 to-53,73 in MW-6. A groundwater <br /> elevation contour map is presented on Figure 3. Groundwater elevation measurements forMW <br /> 2 were not used to establish groundwater elevation contours due to a possible measurement <br /> ! error. The groundwater flow is generally towards the northeast,and is consistent with previous <br /> z <br /> s monitoring results. <br /> { <br /> t � � <br /> F <br /> y bel <br /> II <br />