Laserfiche WebLink
approved subsidence protection plan for the Bowie No. 2 Mine which should <br />minimize subsidence beneath any of the stock ponds. These stock ponds aze <br />owned by BRL. <br />The required sediment and drainage control plan for the Bowie No. 2 Mine must <br />be constructed and maintained as permitted. This system will protect all offsite <br />azeas from any detrimental impacts from sediment or surface runoff originating <br />on the mine site. <br />It is possible that offsite azeas might receive dischazge from such sources as <br />underground mine water, refuse pike leachate, or other mine-related activities. <br />Such pazameters as iron and oil and grease aze strictly regulated by point source <br />dischazge permit standazds (issued by the Colorado Department of Public Health <br />and Environment) limitations. However, mine-related dischazge may exhibit <br />increased levels of total dissolved solids. The Bowie No. 2 Mine permit document <br />provides reasonable predictions of mine-re]ated dischazge quantity and quality, <br />specifically emphasizing possible increases in total dissolved solids to the <br />hydrologic system. The predictions indicate that any such increases should not be <br />significant, and downstream uses should not be impacted. <br />Perched groundwater, located above the mine workings and within the permit <br />boundazy, could be impacted by subsidence. Specifically, subsidence could <br />temporarily de-water these zones; however, these water sources aze not used, and <br />rechazge should occur over time. It is also possible that the local bedrock <br />groundwater quality could be impacted by elevated total dissolved solids <br />concentrations, as the mine fills with water following mining, and as the water <br />infiltrates to surrounding groundwater. Impacts within the pemut azea should be <br />minimal, due to the relative lack of useable groundwater, and due to the vertical <br />separation which exists between the D-2 coal seam and the Rollins Sandstone <br />located considerably below the mining elevation: Local alluvial systems <br />downgradient form the mine should not receive sufficient mine water drainage to <br />create any impacts. <br />IV. Topsoil <br />Information regazding baseline soil studies maybe found in Section 2.04.9 of the permit. <br />Information regazding the salvaging and replacement of topsoil maybe found in section <br />2.05.4 of the pemvt. Except for one situation, all available topsoil will be salvaged from <br />azeas to be disturbed by mining prior to disturbance. During reclamation, topsoil will be <br />replaced in a 12 inch deep layer. Six inches of topsoil will be replaced on top of 3.5 feet <br />of fill over the reclauned gob pile. <br />A. The Division proposes to approve alternative procedures for topsoil protection at <br />one location. Approval of Pemut Revision No. 6 permitted a variance from <br />salvaging all of the topsoil at the train loadout coverfill stockpile. BRL will <br />salvage the top two to three inches of topsoil and then will place geotextile fabric <br />30 <br />