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• <br />• <br />• <br />Production Factors for Soils in Reclaimed Areas <br />United States Department of Agriculture <br />O N RCS <br />NaAral R NXRffceo Conearvadm Service <br />Jim Boyd, Resource Conserveftnist <br />P. O. Box 29 <br />Norwood, CO SUM <br />October 2, 2007 <br />To Whom it May Concern: <br />jim.boydtpcomadagov <br />970327- 424&OFFICE <br />970327 -4247 -FAX <br />In regards to determining 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 />*Soil Types in <br />Reclaimed Area <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 />16 <br />1.1 <br />76 <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 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 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 free to contact me. <br />Sincerely, A4 <br />Jim Boyd, NRCS Resource Conservationist <br />The NatwW Reswsoe ConswwW Savioe wake in pwb wshw with the Mr—rk c Paopb M Equd Opporhe�aY RwWK sect Empbyw <br />to conswve and mwWn nwhiret nrra ntm on privab lands. <br />