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Production Factors for Soils in Reclaimed Areas <br />United States Deparbesat of wgrWu tm <br />4NRCS <br />Nanrd d ..a. . <br />o.. Con.vMbn SOMM <br />.. Cm..rvtlodst <br />P. 0. EICK20 <br />Norwood, CO 81423 <br />October 2, 2007 <br />To Whom it May Concerti: <br />jftbOydQCDAWd&90V <br />970=7- 42484FFME <br />9764WA247 -FAX <br />In regards to dammming expected irrigated pasture 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 />*Boll Types in <br />Rs A * od Ana <br />Assigned <br />Production <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 soil map symbols from the San Miguel Soil Survey) <br />With all other management practices and chemical properties of the various soils being equal, the <br />inherent production potential of a sod is determined by its depth, texture, water holding capacity, <br />and permeability, as well as topographic feattaes such as slope and aspect. Exchrding 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 cheric al properties within and among soil types. <br />Again, the production 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 floe to contact me. <br />Sincerely, 1.6;4 gv <br />Jim Boyd, NRCS Resource Conservationist <br />MW Irrr,d Rssa.as cwrswwiran BwMoe wwa In pw—dp wM to Amwim Propb <br />b awrwvra wd s.Muis mural raswaps m prluub bids. M E* W OppwMdp PiovWw wW Eaipbysr. <br />