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Table 2.06.4(2)(e)-2 <br />WFC Reclaimed Irrigated Pastureland Reference Area <br />WFC <br />Reclaimed Irrigated Pastureland <br />Reference Area <br />New Horizon Mine <br />Weighted <br />Average <br />Soil Type Area acres <br />% of Total <br />Assigned Facto <br />15 2.4 <br />35.24% <br />1.20 <br />0.423 <br />81 1.4 <br />20.56% <br />1.00 <br />0.206 <br />10 1.35 <br />19.82% <br />1.00 <br />0.198 <br />77 1.66 <br />24.38% <br />0.80 <br />0.195 <br />Total 6.81 <br />100.00% <br />1.022 <br />Base Case <br />Ref Area <br />As can be seen from Table 2.05.4(2)(e)-2, the weighted average factor for the reference area is <br />1.022. Map 2.05.4(2)(e)-1 & 2 shows the NRCS soil types for the entire mine permit area. If an <br />area of Reclaimed Irrigated Pastureland is submitted for bond release, the weighted average <br />factor of this area is calculated based on the areas of each soil type multiplied by the <br />associated factor. These numbers are added and divided by the total area to get the weighted <br />average factor. This weighted average factor is then divided by the reference area weighted <br />average production factor (1.022), and the resulting value is multiplied by the reference area <br />production sample mean to obtain the adjusted reference area sample mean. The production <br />standard for that particular reclaimed block is 90% of the adjusted reference area sample <br />mean. For the purpose of statistical comparisons, the reference area production sample <br />standard deviation must be multiplied by the same value as the 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 Reclaimed Irrigated <br />Pastureland at other mines, but it is important at the New Horizon Mine, since there is <br />substantial variation of soil types. Jim Boyd (NRCS-Montrose) informed WFC that a few of the <br />soil types are poor enough that they are simply not irrigated anywhere else in Montrose County. <br />Others, especially some in the western part of the mine area, are better than those in the <br />reference area. <br />August 2013 PR -08 2.05.4(2)(e) - 23 <br />