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Table 2.05.4(2)(e)-2 <br />WFC Reclaimed Irrigated Pastureland Reference Area <br />WIRC <br />Reclaimed Pastureland <br />Irrigated <br />New Horizon Mine <br />Weighted <br />Soil Type Area acres <br />% of Total <br />Assi«ned Factor <br />15 2.4 <br />35.24% <br />120 <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 Cas <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 associated <br />factor. These numbers are added and divided by the total area to get the weighted average <br />factor. This weighted average factor is then divided by the reference area weighted average <br />production factor (1.022), and the resulting value is multiplied by the reference area production <br />sample mean to obtain the adjusted reference area sample mean. The production standard for <br />that particular reclaimed block is 90% of the adjusted reference area sample mean. For the <br />purpose of statistical comparisons, the reference area production sample standard deviation <br />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 Pastureland <br />at other mines, but it is important at the New Horizon Mine, since there is substantial variation <br />of soil types. Jim Boyd (MRCS -Montrose) informed WFC that a few of the soil types are poor <br />enough that they are simply not irrigated anywhere else in Montrose County. Others, especially <br />some in the western part of the mine area, are better than those in the reference area. <br />January 2015 TR -66 2.05.4(2)(e) - 22 <br />