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2020-11-24_REVISION - C1994082
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2020-11-24_REVISION - C1994082
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Entry Properties
Last modified
12/1/2020 10:49:19 AM
Creation date
12/1/2020 10:43:19 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
Revision
Doc Date
11/24/2020
Doc Name
Adequacy Review Response
From
Peabody- Twentymile Coal, LLC
To
DRMS
Type & Sequence
SL8
Email Name
RAR
JLE
Media Type
D
Archive
No
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77 <br />2.84 <br />16 <br />1 0.28 <br />400 <br />10 <br />1.93 <br />1 0.003 <br />0.9 <br />0.023345 <br />78 <br />26.73 <br />16 <br />0.28 <br />1000 <br />20 <br />7.51 <br />0.003 <br />0.9 <br />0.090841 <br />80 <br />12.56 <br />16 <br />0.28 <br />1000 <br />22 <br />8.59 <br />0.003 <br />0.9 <br />0.103905 <br />82 <br />4.19 <br />16 <br />0.28 <br />425 <br />16 <br />4 <br />0.003 <br />0.9 <br />0.048384 <br />84 <br />5.33 <br />16 <br />0.28 <br />685 <br />20 <br />6.5 <br />0.003 <br />0.9 <br />0.078624 <br />85 <br />7.64 <br />16 <br />0.28 <br />750 <br />10 <br />2.72 <br />0.003 <br />0.9 <br />0.032901 <br />97 <br />0.49 <br />16 <br />0.28 <br />160 <br />20 <br />3.52 <br />0.003 <br />0.9 <br />0.042578 <br />0.935142 <br />AVG Tons/Acre/Year 0.055008 <br />Table 6.77ae Divisions RUSLE Calculations for Reference Areas <br />A <br />C <br />% Area <br />Weighted <br />7Ar <br />Aspen <br />0.119627 <br />30 <br />0.24 <br />16.61 <br />0.001 <br />1 <br />0.244 <br />0.029139 <br />Steep Mnt. Brush <br />0.Moff1433 <br />30 <br />0.2 <br />3.98 <br />0.006 <br />1 <br />0.24 <br />0.034392 <br />Mnt. Brush <br />0.602464 <br />30 <br />0.32 <br />20.92 <br />0.003 <br />1 <br />0.489 <br />0.294605 <br />Sagebrush <br />0.460269 <br />30 <br />0.37 <br />41.51 <br />0.003 <br />1 <br />0.027 <br />0.012427 <br />Tons/acre/year <br />weighted <br />0.370613 <br />Table 5 shows the RUSLE values used for this demonstration and the results of the calculation. <br />These results were compared to Table 6, a RUSLE Demonstration performed on the reference <br />areas around the mine site by DRMS for SL7. The reference areas have not changed and <br />therefore this is a suitable comparison. Demonstrated by this comparison the bond release parcels <br />show that they contribute less sediment then the surrounding reference areas therefore the <br />reclaimed area has met the obligations of rule 3.03.1(3)(b). <br />POSTMINING LAND USE <br />POSTMINING LAND USE <br />The postmine land uses for the Yoast mine are livestock grazing and wildlife habitat. Grazing has <br />been conducted since 2009 on reclaimed lands at the mine to implement and demonstrate the <br />postmine land use. Proper grazing management has been used to encourage re-establishment and <br />enhancement of native plant diversity and woody plant density. Sheep have been the only livestock <br />grazing reclaimed lands at the Yoast mine. The grazing season at Yoast has historically been from <br />August through September. The 2015 estimated stocking rate based on available herbaceous <br />production data, forage palatability and a fifty percent (50%) proper use factor was 1.4 acres per <br />animal unit month (AUM - the forage required for one animal unit for one month). The estimated <br />SL-8 - 13 <br />
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