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Getty Task 2 Page 1 March 1, 19 g3 <br />1 <br />S <br />1.0 <br /> <br /> <br />L <br />TAE TWENTYIIILE PAR% PROJECT <br />GROUND WATER HYDROLOGY - h1INE INFLOW ESTIMATES <br />The objective of the hydrologic portion of this study was to evaluate the <br />regional and local hydrology of the Tweatymile Park area and estimate effects <br />of a proposed underground mine oa the hydrologic regime. Because the coal <br />seam to be mined, the Wadge, occurs is a water bearing zone, mining will cause <br />water to flow into the mine. Since inflows to nndergrovad mines can cause <br />difficulties in mine planning end operation and thus add to the ezpense of <br />operating the mine, the primary purpose of the Task 2 study was to quantify <br />the mine inflow. The anticipated effects on the ezistiag hydrology of the <br />region were el so investigated. Because of the complezity of the groundwater <br />hydrology of the region, a two dimensional finite difference groundwater flow <br />model was utilized to estimate quantities of inflow. <br />Ia the Task 1 report, presented earlier, the hydrologic and geologic <br />conditions that ~e:ist in the study area were described. To provide <br />continuity, some of the material presented in the Task 1 report will be <br />included is this report, however, mach of the descriptive and interpretive <br />cork will not be included and references to the Task 1 report are noted as <br />simulation, conclusions, and recommendations. <br />appropriate in this report. <br />In the following sections the simulation model is described, the <br />available data is reviewed, and the computer model formulation and calibration <br />is presented. The final sections provide the results of the computer <br />• <br />,r~ <br />u <br /> <br />