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Gross Erosion, E (tons/acre/year): Calculated from the above defined parameters for each area <br />defined. If the user selects an area from screen, E is calculated in each grid and the cumulative <br />value is calculated. <br />E = R * K * Ls * C * P, where all the parameters are as defined above <br />Volume Calculations: <br />Required User Input <br />Sediment Delivery Ratio (DR): Default = 0.37 <br />Time Period, T (years): Time of analysis; typically the time of the storm event <br />Density of the sediment (D): The post -deposit density of the sediment <br />Runoff (I): Calculated from some other routine like Curve Number and Runoff <br />Total Erosion (E, tons/year) = Sum of (E * Area) for all the areas. <br />Total Yield (Y, tons/year) = E * DR <br />Sediment volume per year (Vs) = Y / Density <br />Total Sediment Volume = Vs * Time period <br />Runoff Volume = Runoff (I) * Total Area <br />Total Pond Volume = Runoff Volume + Total Sediment Volume <br />Pond 008 was constructed in the fall of 2000. Pond 009 was excavated in the spring of 2002. <br />Pond 012 was excavated in spring 2005. Ponds 011 and 013 were constructed in late 2007. Pond <br />014 was constructed in spring 2004 and reclaimed in Fall 2009. Pond 015 was constructed in <br />2011. Accordingly, the values for Ponds 008,009, 011, 012, 013 and 015 are as -built, Map <br />2.05.3(3)-6-1 shows the detailed plan views and cross-sections for ponds 012 and 013. All ponds <br />will utilize a key cut into the dam and seep collars on the principal spillway pipe as shown on the <br />map. All dams will have a minimum combined slope of 5.0:1.0 and will be compacted in no <br />greater than 8" lifts to 90% of the tested maximum dry density of the material. Pond 015 was dug <br />in near solid rock and the embankment side is steeper than 5H:1 V. <br />H. Small Area Exemptions <br />As of the Permit Revision 06, one Small Area Exemption exists in the permit area. This is the <br />disturbed topsoil stripping area in advance of the mining pit. The small area exemption is <br />designed to meet or exceed effluent requirements according to Rule 4.05.2 and was originally <br />approved for the entire permit area in the year 2000 under Permit Amendment PR -5. The designs <br />for this exemption are shown in Attachment 2.05.3(3)-7 Small Area Exemptions. <br />Page 2.05.3(3)-19 October 2015 (TR -69) <br />