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Natwal Resources (Soil) Conservation Service (Soils of Colorado, Loss Factors and <br />' Erodibiliry Hydrologic Groupings, 1983, SCS). The sieve analyses of Nunn soil first used in <br />the 1992 Request, transformed into % passing of the "eroded particle size" fraction (100% <br />passing the Number 4 sieve) is presented in the following table (this soil is Soi] Number 1 <br />in the SEDCAD+ analyses): <br /> <br />Table 2.2-1 Sieve Analysis (Nunn Soil) <br />Screen Size Percent of Sample Passing Percent of Eroded Particle <br />Size Fraction Passing <br />4.00 66.1 100 <br />2.00 47.9 72 <br />1.00 31.9 48 <br />0.500 17.2 26 <br />0.250 8.9 li <br />0.10 ~.3 ~ 3 <br />0.075 ii 23 i 3 <br />0.050 ~ 1.3 ~ 2 <br />0.002 ` 0.6 ~ 1 <br />Original soil of the Revision 1, Barren Ridge, Industrial, East Pit, North Flat, and East Slope <br />areas was Cartacas Loam, and this review and analysis considers salvaged Carracas Loam <br />as the material used to reclaim these (disturbed) areas. Carracas Loam has been assigned <br />' a soil group "D" (high runoff potential) hydrologic characteristic by the Natural Resources <br />Conservation Service (Soils of Colorado, Loss Factors a~td Erodibiliry Hydrologic Groupings, <br />' 1983, SCS). The sieve analysis of Carracas Loam, first used in the 1992 Request and again <br />in the 1993 Request, transformed into % passing of the "eroded particle size" fraction (100% <br />passing the Number 4 sieve) is presented in the following table (this soil is Soil Number 2 <br />' in the SEDCAD+ analyses). This sample was obtained from the East Pit Area. <br /> <br /> <br /> <br />Page 3 of 3d, 7 Oct 96 <br />1 <br />