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will be used for both pre mine and reclaimed conditions. <br />Soil Erodibility Factor "K" <br />This is a measure of the soil's susceptibility to erosion. It is dependent upon the soil's <br />resistance to detachment by rainfall and by its ability to absorb water through <br />infiltration. <br />The soil erodibility factor "K ", was determined from consultation of the NRCS Soil <br />Survey of San Miguel Area, Colorado. The disturbed area is comprised several different <br />soil types, and a composite of their erodibility factor was calculated for the Universal <br />Soil Loss Equation. Some of the soil areas and types in the NRCS survey are slightly <br />different from the soil types shown in the pre -mine survey shown on Map 2.04.9 -1. We <br />used the NRCS survey for the Phase II release area since their soil descriptions have <br />associated "K" values. <br />The reclaimed soil is primarily the same soil redistributed over the regraded areas after <br />mining. It is similar to the pre -mine soil and should also have the similar "K" factor. <br />SL -14 03DEC12.wpd 31 <br />