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• BOWIE NO. 1 (East) MINE <br />APPROXIMATE ORIGINAL CONTOUR VARIANCE <br />Watershed Analysis -Rule 2.06.5(2)(d) <br />Rule 2.06.5(2)(d) requires a demonstration that the watershed of the reclaimed surface <br />facilities will be improved. The watershed will be considered improved if; (i) there will be <br />a reduction in the amount of total suspended solids discharged to the surface waters from <br />the area as compared to such discharges prior to mining; (ii) the total volume of flows from <br />the permit area, during every season of the year, will not vary in a way that adversely <br />affects the ecology of any surface water or any existing or planned use of surface or <br />ground water and; (iii) the appropriate State environmental agencies approve the plan. <br />Rule 2.06.5)(2)(d)(i) <br />The Universal Soil Loss Equation will be used to calculate the soil loss from the reclaimed <br />area and the pre-mined area to determine if the reclaimed configuration of the Bowie No. <br />1 Mine facilities area will reduce the amount of total suspended solids discharged to the <br />surface waters as compared to such discharges prior to mining. <br />The following sediment volume calculation is prepared in accordance with U. S. <br />Department of Agriculture, Technical Notes, Agronomy Note #50, dated January, 1977. <br />USING THE UNIVERSAL SOIL LOSS EQUATION <br />A=R•K•L•S•C•P <br />A is the soil loss in Tons/Acre/Year <br />R =rainfall factor <br />The rainfall factor is derived from the State map (Figure 1) revised April 1980. A factor of <br />30 will be used for both the pre-mined and reclaimed configuration of the facilities. <br />K =soil erodibility factor <br />The soil type in the area of the surface facilities is presented on the Soil Types Map No. <br />9-3. Soil map unit numbers 70 and 75 are shown in the facilities area that is to be <br />reclaimed. Soil number 70 is Saraton-Agua Fria Complex, 20 to 50 percent slopes. Soil <br />number 75 is Torriorthents-Rock Outcrop, sandstone complex. According to the Soil <br />Conservation Service's soil survey of the Paonia area, the "K" factor for the Saraton soil <br />is 0.10. The "IC' factor for the Agua Fria part varies with depth from 0.15 to 0.28. No "K" <br />. April 98 <br />4i <br />'j2- z 8•~RN-03 <br />{lOf2ovE.n r2/ly/99 <br />