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z11*36 <br />FROM 7 odd Garner TU Mrlch AW&n <br />' GIL-MR GEOPHYSICS, INC. <br />' 27203 Armadillo Way, Evargreen, Colorado W439 <br />02 Januan 1998 <br />IIIIIIIUI?MYI <br />999 <br />phone 303.674.8344 <br />fax 303.674.8731 <br />' Mitch Albert Ph.D. <br />President <br /> .Agile Stone Systems, Inc, <br /> 6435 S. Pontiac Court <br /> Englewood, CO 80111 <br /> Re: Hydrogeology Summary Report <br /> Park-dale Project <br /> Dear Dr. Albert: <br /> This letter report summarizes the hydrogeology of the Parkdale Project area, Fremont County, <br /> Colorado, and is submitted in support of the mine permit application currently before the Colorado <br /> Mined Land Reclamation Board The report is divided into thrx major sections, which discuss the <br />glacial outwash aquifer, the bedrock aquifers, and conclusions. <br /> The hydrogeology of the Parkdale Project area is best understood and discussed by first defining two <br /> prinoipal hydrostratigraphic units, those being the glacial outwash aquifer of Quaternary age and the <br /> bedroll: aquifers of Mesozoic age. These aquifers are cut through and hydraulically bounded by the <br />. Arkansas River, faulting adds structural boundaries within the bedrock aquifer system. Polentio- <br /> metric heads and water table elevations within the aquifers arc driven by recharge in topographically <br />higher outcrop areas <br />with dischar <br />e at lower el <br />v <br />ti <br />th <br />b <br />d <br />i <br />h <br /> , <br />g <br />e <br />a <br />ons <br />roug <br />su <br />crops an <br />to spr <br />ng. <br /> Further information and detailed hydraulic and water balance analyses concerning the glacial outwash <br /> aquifer are contained in the Substitute Water Supply Plan submitted to the Division of Water <br /> Resources in December, 1997. <br />Outwash Aquifer <br /> The glacial outwash aquifer beneath the Project area is a sand and gravel deposit of Quaternary age, <br /> as mapped by the USGS and shown in Figure 1-1. This aquifer is bounded on the north and east by <br /> Tallahassee Creek, on the west by Precambrian and Mesozoic rocks, and on the south by the Arkansas <br /> River. The total thickness (water saturated plus unsaturated) of the deposit ranges to at least 67 feet, <br /> depending on location. <br />d <br /> Be <br />rock units of Jurassic and Cretaceous age subcrop beneath the outwash aquifer in the Project area <br /> In stratigraphically ascending order these units include the Morrison Formation, the Dakota Group <br /> (Purgatoire Formation and Dakota Sandstone), the Colorado Group (Graneros Shale, the Greenhorn <br /> Limestone, and the Carlisle Formation), and the Niobrara Formation. Structurally. the bedrock units <br /> were deformed during the Laramide Orogeny into a syncline whose axis trends generally NW-SE and <br /> dro <br />H <br />eolo <br />vRe <br />rt P <br />kd <br />l <br />P <br /> y <br />g <br />g <br />po <br />or <br />a <br />e <br />roject Page 1 of 4 <br />