2015-09-17_PERMIT FILE - C1984065A ‎(2)‎

• Permit No: C1984065A
• IBM Index Class Name: Permit File
• Doc Date: 9/17/2015
• Doc Name: pp.4-53 to 4-73
• Section_Exhibit Name: 4.4 Reclamation & 4.5 Post Mining Land Use
• Media Type: D
• Archive: Yes

• SOIL LOSS COMPARISON - COAL RIDGE NO. 1 MINE
RECLAIMED VERSUS BASELINE CONDITIONS
The following calculations are presented to determine if untreated drainage from the reclaimed Coal
Ridge No. 1 Mine Sagebrush Community is contributing suspended solids to streamflow or runoff
outside the permit area in excess of premining levels.
The baseline data for comparison are considered to be those conditions that exist in the reference area
located east of the reclaimed mine site. The October 2000 vegetation study (Appendix 3.6-5) presents,
in Table C3, the vegetation conditions that exist in the reference area as follows:
Baseline
Total Vegetation Cover 49.1%
Perennial Cover
Grasses, etc.
22.5%
Forbs
0.0%
Shrubs
26.4%
Trees
0.1%
Other
0.1%
Total Perennial Cover
49.1%
Litter
34.0%
Perennial Cover +Litter
83.1%
Canopy (Trees and Shrubs)
26.5%
The condition of the reclaimed Coal Ridge No. 1 Mine Site is taken from the October 2000 vegetation
study (Appendix 3.6-5). The results of this vegetation report, presented in Table C3 of the report, are as
follows:
The Universal Soil Loss Equation will be used to calculate the soil loss from the reclaimed mine site and
the baseline conditions to determine if untreated drainage from the reclaimed mine site is contributing
suspended solids in excess of premining levels.
The following sediment volume calculation is prepared in accordance with U. S. Department of
Agriculture, Technical Notes, Agronomy Note #50, dated January, 1977.
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06/01
Reclaimed
Total Vegetation Cover
•
44.4%
Perennial Cover:
Grasses, etc.
23.5%
Forbs
18.3%
Shrubs
2.5%
Trees
0.1%
Other
0.0%
Total Perennial Cover
44.4%
Litter
39.5%
Perennial Cover + Litter
83.9%
Canopy (Trees and Shrubs)
2.6%
The Universal Soil Loss Equation will be used to calculate the soil loss from the reclaimed mine site and
the baseline conditions to determine if untreated drainage from the reclaimed mine site is contributing
suspended solids in excess of premining levels.
The following sediment volume calculation is prepared in accordance with U. S. Department of
Agriculture, Technical Notes, Agronomy Note #50, dated January, 1977.
4-58ii
06/01