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Production Factors for Soils in Reclaimed Areas <br />Uniteid StMee+s Deipne b nt of Agric <br />4NRCS <br />N�ral a..a�.o.e Carw,a*m Serwim <br />.f, Boyd. R..mm Coww d old <br />P. O. Bax29 <br />Norwood, CO 01423 <br />October 2, 2007 <br />To Whom it May Concern: <br />rm.b0ydDo0aa1.9ov <br />970.327- 42464*'FICE <br />970327. 4247 -FAX <br />In regards to determining expected irrigated pwwm yields, when compared to the mean of yields <br />on a reference site established on the Western Fuels Mine property in Nucla, Colorado, I have <br />assigned the following production factors to each soil type encountered on the mine property. <br />'Soil Types in <br />RsaWmsd Ana <br />Assigned <br />PnAkictio <br />Factor <br />15 <br />1.2 <br />81 <br />1.0 <br />10 <br />1.0 ' <br />77 <br />0.8 <br />78 <br />0.7 <br />112 water <br />0.0 <br />18 <br />1.1 <br />78 <br />0.5 <br />14 <br />1.2 <br />82 <br />0.9 <br />71 <br />1.2 <br />3 <br />0.9 <br />'(Soil types are designated using sod map symbols from the San Miguel Sort Survey) <br />With all other management practices and chemical properties of the various soils being equal, the <br />inherent production potential of a soil is determined by its depth, texture, water holding capacity, <br />and permeability, as well as topographic features such as slope and aspect. Excluding aspect, I <br />have used the aforementioned soil properties to determine the relative production factors <br />assigned to each soil type. Realize though that their can be a wide range of variability of <br />physical and chemical properties within and among soil types. <br />Again, the pr oductkm factors are intended to be used to establish expected yields of each soil <br />type relative to the mean of yields on the established reference area on the Western Fuels Mine <br />property, provided there is similar aspect, management, and plant species present across soil <br />types and the reference area <br />If you have any questions regarding this analysis, Please feel free to contact me. <br />Sincerely, 90 <br />Jim Boyd, NRCS Resource Conservationist <br />71W Mrrtad flwww ca.w,Arloa SwNw web In per IN UM ■N Amwim PIwpM <br />b conmw aid embb mokmW m prWe WW& M Equd nppwkxft P-vW- ail Eaipin t <br />