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<br />-15- <br />STIPULATION N0. <br />THE PERMITTEE MUST PLACE A MINIMUM OF ONE FOOT OF SUITABLE MATERIAL OVER THE <br />UNDERDRAIN TO FORM A GRANULAR FILTER. THIS MATERIAL SHOULD BE GRADED SIMILAR <br />TO THE GRANULAR FILTER USED BEHIND THE RIPRAP IN THE RELOCATED STREAM CHANNEL <br />AS FOUND IN ADDENDUM E. SECTION 8 OF THE PERMIT REVISION APPLICATION. <br />In order to verify protection of the hydrologic balance with regard to <br />quality, the following stipulation is required. <br />STIPULATION N0. 8 <br />THE PERMITTEE MUST COMMIT TO PLACING TWO MONITORING WELLS IN THE FILLED <br />CHANNEL; ONE ON THE UPSTREAM END AND ONE ON THE DOWNSTREAM END. THESE WELLS <br />SHOULD BE COMPLETED IN THE COBBLE AND GRAVEL FILL AND MONITORED MONTHLY FOR <br />WATER LEVEL AND QUARTERLY FOR THE SUITE OF PARAMETERS GIVEN IN STIPULATION N0. <br />3. <br />With the acceptance of the above stipulations the proposed operation is in <br />compliance with the ground water requirements. <br />VII. Probable Hydrologic Consequences of Mining and Cumulative Hydrologic <br />The following cumulative hydrologic impact study (CHIS) has been prepared for <br />the portion of the Purgatoire River Basin above Madrid, Colorado, pursuant to <br />Rule 2.07.6(2)(c). This CHIS assesses the projected cumulative hydrologic <br />impacts of all anticipated mining operations in the general area of the New <br />Elk Mine. <br />Mining operations included in the analysis include the Wyoming Fuel Company <br />New Elk (CMLRD Permit Number C-12-81) and Golden Eagle (CMLRD Permit Number <br />C-13-81) mines. These mines are existing underground mines located in the <br />Stonewall and Picketwire valleys within the Purgatoire River drainage. This <br />assessment is based primarily upon data and analysis contained in the New Elk <br />and Golden Eagle mines permit applications, information supplied in the New <br />Elk permit revision application, and upon the observations of Division <br />personnel during inspections of the mine site. Some additional analysis was <br />performed by the Division to complete the finding. <br />This discussion is divided into four major subsections: Description of the <br />Existing Environment, the Probable Hydrologic Consequences of Mining, the <br />Cumulative Hydrologic Impacts of Mining, and Continued Monitoring <br />Requirements. Surface and ground water are discussed separately in each <br />subsection. <br />DESCRIPTION OF THE EXISTING ENVIRONMENT <br />The study area is situated in the Park Plateau, a subdivision of the Great <br />Plains physiographic province, which consists of the dissected highlands that <br />separate the High Plains to the east from the Rocky Mountains to the west. <br />The Purgatoire River flows through the study area and is one of the major <br />streams that drains the region. It forms in the Sangre de Cristo Range south <br />of the Spanish Peaks and has three major headwater tributaries; the North <br />