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! BlaesE"ironmenlal Management.Inc. <br /> 002-70950-04 U-Haul#749-50 <br /> + Groundwater Monitoring Report <br /> 09/09/02 <br />} 3.0 GROUNDWATER MONITORING PROGRAM <br /> 4 <br /> 1 <br /> The groundwater monitoring program discussed below includes one monitoring event conducted in June <br /> ' 2002. The measurement and sampling methods employed throu throughout the <br /> g groundwater monitoring event <br /> are discussed in the following sections. <br /> 3.1 GROUNDWATER MEASUREMENTS—,TUNE 2002 <br /> On June 25, 2002, Blaes Environmental measured the depth to groundwater in 19 of the 25 groundwater <br /> monitor well casings associated with the site. The "A" casings did not contain water and thus were not <br /> measured. Groundwater levels in the `B" and "C"well casings were measured from a surveyed point on <br /> the top of the monitoring well casingto the <br /> groundwater surface. All water levels were measured to the <br /> j <br /> nearest hundredth of a foot(0.01 ft.) using a Heron electronic water-level sounder. The water level depth <br /> and time of measurement were recorded on a standard field data sheet. The original field data sheets for <br /> this monitoring event are included in Appendix B and presented alongside previous monitoring data in <br /> Table 2. Groundwater depth measurements were performed in accordance with Blaes Environmental <br /> groundwater monitoringprocedures p dures presented in Appendix C. <br /> Groundwater depths recorded on June 25, 2002, ranged from 52.66 feet below top of casing (btoc) in <br /> 7. well MW-7C to 56.22 feet btoc in well MW-2C. Groundwater elevations ranged from 34.93 feet below <br /> i mean sea IeveI in well MW-SC to 35.70 feet below mean sea level in well MW-2C (Table 2). No free- <br /> phase hydrocarbons were observed during collection of groundwater level measurements. Other <br /> observations collected during groundwater monitoring activities are presented on the field data sheet <br /> included in Appendix B. <br /> The data from the "B" and "C" well casings were used to create groundwater condition maps showing <br /> the groundwater flow direction across the site. On June 25, 2002, the average groundwater flow <br /> direction using data from the "B"well casings was generally to the east(Figure 3). The groundwater flow <br /> direction in the "C" well casings ,was also generally toward the east (Figure 4). Note that the <br /> groundwater flow directions indicated in Figures 3 and 4 are estimates, as the gradient is nearly flat. <br /> r <br /> j 5 <br />