2011-02-28_PERMIT FILE - C1991078A ‎(3)‎

• Permit No: C1991078A
• IBM Index Class Name: Permit File
• Doc Date: 2/28/2011
• Section_Exhibit Name: 2.05 Operation and Reclamation Plan
• Media Type: D
• Archive: Yes

SOIL LOSS COMPARISON - HAMILTON COAL MINE
• RECLAIMED VERSUS BASELINE (ADJACENT) CONDITIONS
The following calculations are presented to determine if untreated drainage from the reclaimed
Hamilton Coal Mine 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 adjacent area
located west of the reclaimed mine site. The Cedar Creek Associates, Inc., 2009 Revegetation Evaluation
located in Exhibit 5, presents the vegetation conditions that exist in the adjacent area as follows:
Adjacent
(Baseline)
Total Vegetation Cover 19.8%
Perennial Cover:
Grasses, etc.
9.3%
Forbs
0.2%
Shrubs
8.7%
Trees
0.0%
Other - Rock
1.6%
Total Perennial Cover
19.8%
Litter
27.7%
Perennial Cover + Litter
47.5%
Canopy (Trees and Shrubs)
8.7%
The condition of the reclaimed Hamilton Mine Site is taken from the same 2009 Vegetation Evaluation
The results of this vegetation report, are as follows:
is Reclaimed
Total Vegetation Cover
32.3%
Perennial Cover:
Grasses, etc.
17.0%
Forbs
3.8%
Shrubs
9.4%
Trees
0.0%
Other - Rock
2.2%
Total Perennial Cover
32.3%
Litter
22.1%
Perennial Cover + Litter
54.4%
Canopy (Trees and Shrubs)
9.4%
The Universal Soil Loss Equation will be used to calculate the soil loss from the reclaimed mine site and
the adjacent baseline area 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. The tables and figures utilized
in the USLE calculations are obtained from the referenced Agronomy Note #50.
USING THE UNIVERSAL SOIL LOSS EQUATION
R (rainfall) factors are assigned by geographical regions based on weather data
furnished by the U.S. Weather Service. R values are based on rainfall amount, time,
and intensity. In the mountains, R values were computed primarily for valley areas and
• have been increased to account for run -off from snow melt. The R factor used for this
calculation is derived from an iso- erodent map, Figure 2, and is the same for both the
reclaimed slope and the adjacent natural slope.
K (soil erodibility) factors are assigned to each soil series and they are used to predict
the erodibility of a soil and its tolerance to erosion in relation to specific kinds of land
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