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United States Department of Agriculture <br />a NRCS <br />Naked Reeatxcee Carvwvsdan Service <br />An Boyd. Rwowwce Cor"r4MMIst jim.boyd ®co.u*dayov <br />P. O. Box 29 970327- 42464:)FFICE <br />Norwood, CO 81423 970327.4247 -FAX <br />October 2, 2007 <br />To Whorn it May Concern: <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 />*Sail 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 sod 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, I <br />l <br />g <br />Jim Boyd, NRCS Resource Conservationist <br />T6a Naknl Rawu= CorwwwMan s«v" wart in p&tmmWV with tiro Am== Paq* <br />to coneerw and =wtWn nahKd resarrcae an P1 M6 rrrKis. An EquN Oppo tw* Provider OW EmO"W. <br />Revised April /09 TR58 <br />2.05.4(2)(e) -19K <br />V - 5$ <br />APP -ov <br />mkw 2W9 <br />