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t� <br />EXECUTIVE SUMMARY <br />Water Management Consultants, Inc. (WMC) has prepared this report for Colowyo Coal <br />Company, a division of Kennecott Energy Company (KEC), in support of a pre - feasibility <br />study for the proposed Collom Mine. The proposed Collom Mine is located <br />approximately four miles west of KEC's Colowyo Mine in northwest Colorado, midway <br />between the cities of Craig and Meeker. <br />This report summarizes the project -wide groundwater and surface water baseline <br />conditions for the proposed Collom Mine. It also addresses key hydrologic issues <br />associated with project development including mine dewatering, slope depressurization, <br />and mine water management. Data collection activities related to the baseline <br />hydrologic characterization were conducted according to a Work Plan prepared for the <br />Colorado Division of Mines and Geology (CDMG). A detailed Sampling and Analysis <br />Plan (SAP) was also prepared for the project that described both baseline <br />characterization activities and investigations conducted for the development of the pre - <br />feasibility level dewatering /depressurization program. <br />Works performed to meet the objectives of the Work Plan included: <br />• evaluation of geologic borings; <br />review of previous investigations; <br />installation and sampling of 13 bedrock and 5 valley fill monitoring wells; <br />short-term aquifer tests at 33 locations; <br />water level measurements; <br />• installation of a pilot dewatering well and piezometer network; <br />• a 35 -day test of the pilot dewatering well; <br />surface water and groundwater sampling; <br />a spring /seep survey and sampling; <br />• development of a conceptual hydrogeologic model; <br />• development of a pre - feasibility level dewatering /depressurization design <br />for two mine plans; <br />2572 -R2 Colowyo Coal Company <br />Water Management Consultants <br />