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<br />minimal and surface cracks should fill with sediment relatively quickly. Actual <br />interruption of surface flows should not be significant. <br />Stock ponds located above the mine, and within the permit area, could also be <br />impacted by subsidence; however, significant impacts are unlikely, due to the <br />approved subsidence protection plan for the Bowie No. 2 Mine which should <br />minimize subsidence beneath any of the stock ponds. These stock ponds are <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 />areas from any detrimental impacts from sediment or surface runoff originating <br />on the mine site. <br />It is possible that offsite areas might receive discharge from such sources as <br />underground mine water, refuse pile leachate, or other mine-related activities. <br />Such parameters as iron and oil and grease are strictly regulated by point source <br />discharge permit standards (issued by the Colorado Department of Public Health <br />and Environment) limitations. However, mine-related discharge may exhibit <br />increased levels of total dissolved solids. The Bowie No. 2 Mine permit document <br />provides reasonable predictions of mine-related discharge 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 />boundary, could be impacted by subsidence. Specifically, subsidence could <br />temporarily de-water these zones; however, these water sources are not used, and <br />recharge 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 permit area 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 regarding baseline soil studies may be found in Section 2.04.9 of the permit. <br />Information regarding the salvaging and replacement of topsoil may be found in section <br />2.05.4 of the permit. All available topsoil will be salvaged from areas to be disturbed by <br />mining prior to disturbance. During reclamation, topsoil will be replaced in a 12 inch <br />deep layer. Six inches of topsoil will be replaced on top of 3.5 feet of fill over the <br />reclaimed gob pile. <br />27 <br /> <br />