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<br />• OUTLINE OF GROUND WATER RESPONSE METHODOLOGY <br />The first step toward analyzing the ground water response to the expansion of <br />the Goose Haven Reservoir Complex was to use the geologic and ground data from <br />the previous investigations to picture the underground at and around the complex. <br />Next topographic maps of the area were consulted to place the close and nearby <br />surface water features in relationship to the complex. <br />The reservoir complex is a part of a larger, areal groundwater system. The <br />reservoir complex with its slurry wall barrier separating the reservoir water from the <br />ground water will tend to reroute the ground water around the complex. The ground <br />water surface will tend to "mound" up-gradient (south) of the complex and "depress" <br />down-gradient (north) of the complex. The existing reservoirs are currently <br />influencing ground water in this way and construction of the new reservoir will <br />similarly influence ground water. <br />• There are several computer applications available to analyze the mounding <br />(rise) and depression (lowering) of the ground water in an area as water is introduced <br />or removed from a groundwater system. CTL T selected Visual MODFLOW for the <br />computer application to analyze the groundwater system in question because of its <br />capabilities to model three-dimensional groundwater flow, visualize the input <br />parameters and model results in 2D (two dimensions/cross-section and plan view) or <br />3D (three dimensions) at any time during the development of the model or the <br />displaying of the results. <br />The selection of the modeling application leads to setting the boundary <br />conditions that the model uses to make the necessary calculations and display the <br />response (i.e. mounding or depressing) of the groundwater surface. The topography, <br />geology, surface water features, existing reservoirs, underground soils, and bedrock <br />engineering characteristics were decided and combined and input to the model. <br />After the surface and subsurface were pictured and input to the computer <br />model, the model was calibrated by using it to predict the groundwater conditions <br />• before the construction of the new reservoir. The parameters for the new reservoir <br />McLAUGHLIN WATER ENGINEERS, LTD. 3 <br />GOOSE HAVEN RESERVOIR COMPLEX EXPANSION <br />CTL I T PROJECT NO. FC04797.002-145