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• <br />Contents <br />1.0 Introduction ........................................................................................................1-1 <br />1.1 Purpose of Report ..................................................................................1-1 <br />1.2 Site Description and Location ..............................................................1-1 <br />1.3 Regulatory Background ........................................................................ 1-1 <br />1.4 Organization of Report .......................................................................... 1-2 <br />• <br />2.0 Geologic and Hydrogeologic Characteristics ...............................................2-1 <br />2.1 Geologic Setting .................................................................................... .. 2-1 <br />2.1.1 Phisiography .......................................................................... ..2-1 <br />2.1.2 Regional Stratigraphy ........................................................... .. 2-1 <br />2.1.3 Structural Geology ................................................................ .. 2-4 <br />2.2 Regional Hydrogeologic Framework ................................................ .. 2-4 <br />2.2.1 Climate ................................................................................... .. 2-4 <br />2.2.2 Surface Water ........................................................................ .. 2-5 <br />2.2.3 Groundwater ......................................................................... .. 2-6 <br />2.3 Local Hydrogeologic Framework ..................................................... .. 2-8 <br />2.3.1 Potential Aquifers in Area of Van 4 Mine ......................... .. 2-8 <br />2.3.2 Potential Water-Bearing Fracture Zones ........................... 2-10 <br />2.3.3 Direction and Rate of Groundwater Flow ......................... 2-11 <br />2.3.4 Naturally Occurring Geochemical Conditions ................. 2-12 <br />2.3.5 Groundwater Quality ........................................................... 2-12 <br />2.3.6 Existing and Potential Future Uses of Groundwater....... 2-13 <br />3.0 Conclusions .........................................................................................................3-1 <br />4.0 References .........................................................................................................4-1 <br />• <br />Tables <br />Table 2-1 <br />Table 2-2 <br />Table 2-3 <br />Table 2-4 <br />Table 2-5 <br /> <br />Monthly Average Maximum and Minimum Temperatures at <br />Uravan, Colorado Weather Station <br />Monthly Total Precipitation Data from Uravan, Colorado <br />Weather Station <br />Pan Evaporation Data at Dead Horse Creek, near Naturita, <br />Colorado <br />Average Wind Speed and Direction Data, Grand Junction, <br />Colorado <br />Characteristics of Hydrogeological Units in the Paradox Basin <br />Dlnelson work\denison\ftnal van 4 hydro report\Dreft final Van 4 hydrogeology report.doc