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<br />contours of the bedrock surface and isopachs showing the depth to bedrock under <br />much of the reservoir complex. <br />A simplified picture of the ground was synthesized from the geologic literature, <br />the geotechnical report in Appendix B, reconnaissance of the geology of the vicinity <br />and the CTL T experience with sites of similar geomorphology. This synthesized <br />model of the ground under and in the vicinity of the reservoir complex was used to <br />formulate the boundary conditions for the computer modeling of the effect of the <br />construction of Reservoir No. 2 discussed below. <br />GROUNDWATER MODEL <br />The depth to ground water measured in a network of piezometers around the <br />site provided the data to map the groundwater surface in the model area. The <br />geologic reconnaissance of the area found surface evidence of geologic and man- <br />made features that would affect the model. This information and other data measured <br />in field and laboratory studies were used in the finite difference computer program <br />Visual MODFLOW to model the "mounding" and "depressing" affect of the new <br />reservoir on the groundwater level. <br />Visual MODFLOW Input (Existing Conditions) <br />The flow type "Saturated (Constant Density)" and "USGS MODFLOW 2000 from <br />WHI" were selected as the numeric engine to create a new model. The other available <br />numeric engines for this software were similar to this numeric engine; however, the <br />other numeric engines were primarily structured for contaminant transport projects. <br />The model selected generates groundwater flow. The "Time Option" selected was <br />"Steady State Flow" to simulate steady state groundwater flow conditions. <br />CTL T imported a site map from Google Earth into the "Model Domain" and <br />set the model "Grid" to have 50 columns, 50 rows and two layers. The number of <br />grids was chosen to reasonably limit the number of cells and associated computing <br />time to solve the model. The minimum model boundary elevation of 4,800 and a <br />• maximum model boundary elevation of 5,200 were selected. The site map imported <br />McLAUGHLIN WATER ENGINEERS, LTD. 7 <br />GOOSE HAVEN RESERVOIR COMPLEX EXPANSION <br />CTL I T PROJECT NO. FC04797.002-145