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h F. <br /> T Coca-Cola Enterprises-West <br /> USTEC Job No. 90054.03 <br /> groundwater at each of six existing groundwater monitoring wells located at the site. The <br /> locations are shown on Figure 2. <br /> { Each of the six existing groundwater monitoring wells were measured for depth to groundwater <br /> and groundwater table elevations(referenced to mean sea level)on May 22,1991.Groundwater <br /> measurements were collected and measured to the nearest 0.01 feet using a calibrated Marine <br /> r7 Moisture Control.0 (MMC) electronic interface probe. The electronic interface probe was <br /> decontaminated between measurements to reduce the possibility of potential cross- <br /> contamination. The decontamination process consisted of an initial wash in Aiconox®/distilled <br /> } water solution followed by three distilled water rinses. <br /> E <br /> x� <br /> 2.2 GROUNDWATER ELEVATION RESULTS <br /> s Groundwater elevations were calculated using a well head survey conducted by Mid-Valley <br /> n, <br /> -da. The survey consisted of level circuits carri <br /> Engineering, Modesto,Califon <br /> ed From a City of <br /> ' Stockton Datum Benchmark. The accuracy of this survey was within 0.01 feet. The results of <br /> = the groundwater elevation measurements collected by USTEC personnel are presented in Table <br /> 1. A summary of historical groundwater elevations are presented in Table 2. <br /> i <br /> The groundwater elevation increased an average of 0.19 feet from March 1,1991 to May 22,1991: <br /> Groundwater elevation ranged from -52.00 in MW-3 to -52.23 in MW-6. A groundwater <br /> elevation contour map is presented on Figure 3. The groundwater flow is generally towards the <br /> northeast,and is consistent with previous monitoring results.; <br /> I <br /> 3.0 GROUNDWATER SAMPLING PROCEDURES <br /> The six existing groundwater monitoring wells were sampled.by USTEC personnel on May 22, <br /> 1991. In order to minimize the risk of cross-contamination during the sampling program,work <br /> " proceeded in order from the wells with the least contamination, as noted in the previous <br /> quarterly monitoring,to wells with increasingly contaminated water. <br /> 2 <br />