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with sediment relatively quickly. Actual interruption of surface flows should not be <br /> significant. <br /> Stock ponds located above the mine,and within the permit area,could also be impacted <br /> by subsidence;however, significant impacts are unlikely,due to the approved subsidence <br /> protection plan for the Bowie No.2 Mine which should minimize subsidence beneath any <br /> of the stock ponds. These stock ponds are owned by BRL. <br /> The required sediment and drainage control plan for the Bowie No. 2 Mine must be <br /> constructed and maintained as permitted. This system will protect all offsite areas from <br /> any detrimental impacts from sediment or surface runoff originating on the mine site. <br /> It is possible that offsite areas might receive discharge from such sources as underground <br /> mine water,refuse pile leachate, or other mine-related activities. Such parameters as iron <br /> and oil and grease are strictly regulated by point source discharge permit standards <br /> (issued by the Colorado Department of Public Health and Environment). However, <br /> mine-related discharge may exhibit increased levels of total dissolved solids. The PAP <br /> provides reasonable predictions of mine-related discharge quantity and quality, <br /> specifically emphasizing possible increases in total dissolved solids to the hydrologic <br /> system. The predictions indicate that any such increases should not be significant,and <br /> downstream uses should not be impacted. <br /> Perched groundwater,located above the mine workings and within the permit boundary, <br /> could be impacted by subsidence. Specifically, subsidence could temporarily de-water <br /> these zones;however,these water sources are not used,and recharge should occur over <br /> time. It is also possible that the local bedrock groundwater quality could be impacted by <br /> elevated total dissolved solids concentrations,as the mine fills with water following <br /> mining, and as the water infiltrates to surrounding groundwater. Impacts within the <br /> permit area should be minimal,due to the relative lack of useable groundwater,and due <br /> to the vertical separation which exists between the D-2 coal seam,the B-2 coal seam and <br /> the Rollins Sandstone located considerably below the mining elevation. Local alluvial <br /> systems downgradient from 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 PAP. <br /> Information regarding the salvaging and replacement of topsoil may be found in section 2.05.4 of <br /> the PAP. Except for one situation(discussed below), all available topsoil will be salvaged from <br /> areas to be disturbed by mining prior to disturbance. During reclamation,topsoil will be replaced <br /> in a 12 inch deep layer. Six inches of topsoil will be replaced on top of 3.5 feet of fill over the <br /> reclaimed gob pile. <br /> A. The Division proposes to approve alternative procedures for topsoil protection at one <br /> location. Approval of Permit Revision No. 6 permitted a variance from salvaging all of <br /> the topsoil at the train loadout coverfill stockpile. The plan is for BRL to salvage the top <br /> two to three inches of topsoil and then place geotextile fabric on the coverfill area. Soil <br /> from the cut operations for the train loadout can then be placed on top of this geotextile <br /> material (4.06.1(2)). <br /> 20 <br />