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APPENDIX 2.05.3-7 (Continued) <br />r 1 <br />LJ <br />TABLE 2 <br />SURFACE IMPOUNDMENT SEDIMENT STORAGE ANALYSIS <br />SUN COAL COMPANY - MEADOWS N0. 1 <br />ROUTT COUNTY, COLORADO <br />• <br />Area A - Surface Impoundment #2 (Map 10) <br />Life of impoundment <br />Sediment yield per acre <br />Total sediment output for watershed <br />Conversion 1 Ton sediment = .823 yd3 <br />2575.5 T x .823 ~ = 2448.8 CY sediment <br />2448.8 CY sediment - 4840 = 4840 ~ = 0.51 ac.ft. <br />Surface Impoundment #1 - 10-year sediment <br />Capacity = 0.51 ac.ft. <br />Area B - Surface Impoundment #2 (Map 10) <br />life of impoundment <br />Sediment yield per acre <br />Total sediment output for watershed <br />10 years <br />62.12 T/ac <br />2975.5 T/project <br />10 years <br />63.44 T/ac <br />2436.1 T/project life <br />Conversion 1 Ton sediment - .823 CY <br />2436.1 T x .823 TY = 2005.0 CY/project life <br />2005.0 CY - 4840 CY = 0.41 ac.ft. <br />T <br />Surface Impoundment #1 - 10-year sediment <br />Capacity = 0.4i ac.ft. <br />Potential diverted sediment from Areas C and D (Map 10) _ <br />Area C <br />66.09 T/ac x 6.5 ac = 429.6T x •823 CY 353CY - 4840 CY = .07 ac.ft. <br />T ac. ft. <br />Area D <br />67.42 T/ac x 5.6.ac - 377.5T x •823CY = 310.7CL - 4840 CY = 0.06 ac.ft. <br />T ac ~. <br />Area E -Sediment storage analysis was not calculated because the area is <br />. sediment contro]led by a sediment trap and not required by CMLRD for design <br />purposes (see Appendix 2.05.3-108). <br />- 258 - <br />(Rev. 5/86) <br />