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2024-05-14_REVISION - C1981028
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2024-05-14_REVISION - C1981028
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Last modified
5/15/2024 8:46:26 AM
Creation date
5/15/2024 8:33:07 AM
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Template:
DRMS Permit Index
Permit No
C1981028
IBM Index Class Name
Revision
Doc Date
5/14/2024
Doc Name
Application
From
Habitat Management
To
DRMS
Type & Sequence
SL12
Email Name
RDZ
AME
Media Type
D
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No
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Coors Energy Company Keenesburg Mine—Phase II/III Bond Release Application <br /> Sedimentology Demonstration <br /> 2.4 Cover Factor(C) <br /> The C factor in RUSLE accounts for the effect of plant and litter cover on the ground <br /> surface in reducing erosion by intercepting raindrops and reducing direct contact with the <br /> soil. A previous application for Phase II bond release characterized the undisturbed sand- <br /> sage community and established a C factor of 0.036 based on tables in Wishmeier and Smith <br /> (1978). This evaluation continues to use this previous C factor value for the undisturbed <br /> condition. <br /> For the reclaimed areas, C factors were calculated in RUSLE using the collected vegetation <br /> cover and production data for 2021 and 2022 (Table 2). Because the collected vegetation <br /> canopy and ground cover data were only first hit cover, the litter contribution to ground <br /> cover was adjusted to consider its presence underneath the vegetation canopy. This was <br /> accomplished by multiplying the first hit litter by the total vegetation cover to estimate <br /> under-canopy litter ground cover contribution. A reduction for basal area was not taken <br /> because litter density typically increases as the distance to the crown decreases. <br /> Root mass in the top four inches was estimated using the assumptions that grass biomass is <br /> distributed about 30% above ground and about 70% below ground(from data in Hoover et <br /> al. 2019 and Uresk et al. 2015) and that about 60% of root mass is in top four inches of soil <br /> (from data in Ansley et al. 2014, Hoover et al. 2019, and Koski 1983). <br /> Other values entered into the RUSLE program for calculating the C factor are listed below. <br /> • Mixed grass prairie with roughness of 1 inch <br /> • Disturbed=yes <br /> • 7 years for consolidation <br /> • Years since last disturbance = 15 and 16 years for 2021 and 2022, respectively <br /> (seeded 2006) <br /> • General land use = 8 (disturbed fill, topsoiled, no rock cover) <br /> Table 2: 2021/2022 Vegetation Monitoring Data and C Factor <br /> h <br /> ° c <br /> 0 a /.1 a c o <br /> vy GC <br /> o ) € o - w <br /> H � H � w � 4004 04 � H °.. Hw w E u <br /> 2021 81.4 36.8 0.0 45.6 16.8 62.4 900 1260 0.013 <br /> 2022 82.5 33.0 0.0 49.5 16.3 65.8 1056 1478 0.011 <br /> 2.5 Control Practice Factor(P) <br /> This factor is used to identify those soil conservation and sediment control practices which <br /> affect the level of sediment generated from a site (e.g., ditches, ponds, sediment traps). In <br /> this comparison we are interested in the sediment generated from the reclaimed site above <br /> such structures, as if they had been removed. Likewise, for the undisturbed area,there are no <br /> SL-12 4 May 2024 <br />
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