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Table 2.05.4(2)(e)-6 <br />Western Fuels <br />Irrigated Pasture Reference Area <br />New Horizon #2 Mine Weighted <br />Average <br /> <br />Soil Type Area acres % of Total Assigned Factor <br /> <br />15 2.4 35.24% 1.20 0.423 <br />81 1.4 20.56% 1.00 0.206 <br />10 1.35 19.82% 1.00 0.198 <br />77 1.66 24.38% 0.80 0.195 <br /> <br />Total 6.81 100.00% 1.022 Base Case <br />Ref Area <br />As can be seen from the table above, the weighted average factor for the reference area is 1.022. <br />Map 2.05.4(2)(e)-1 & 2 shows the NRCS soil types for the entire mine permit area. If an area of <br />irrigated pasture is submitted for bond release, the weighted average factor of this area is <br />calculated based on the areas of each soil type multiplied by the associated factor. These numbers <br />are added and divided by the total area to get the weighted average factor. This weighted average <br />factor is then divided by the reference area, weighted aaverag6 ad/ustment factor;(1:022). and the <br />resulting value is multiplied by the reterence area production sample mean to obtain the adjusted <br />reference area sample mean. The, production standard for that particular reclaimed block is (90% <br />oo the adjusted reference area sample means. For the purpose of :statistical comparisons; the <br />reference area production sample standard deviation must be multiplied by the same value as the <br />sample mean. <br />This method has the advantage of truly accounting for the differences in soil type from one area <br />to another. This may not be necessary in other smaller tracts of irrigated pasture at other mines, <br />but it is important at the New Horizon #2 Mine, since there is substantial variation of soil types. Jim <br />Boyd has stated that a few of the types are poor enough that they are simply not irrigated <br />anywhere else in Montrose County. Others, especially some in the western part of the mine area, <br />are better than those in the reference area. <br />For cover success standards, the cover in the reference area will be compared to the cover in the <br />reclaimed area with no weighted average adjustments for soil type. <br />Revised April/09 TR58 2.05.4(2)(e) -191 <br />V - 59 <br />) 3.may 2W9