2008-01-16_PERMIT FILE - C1994082A ‎(6)‎

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 1/16/2008
• Doc Name: Drainage and Sediment Control Plan
• Section_Exhibit Name: Tab 13 Attachment 13-12
• Media Type: D
• Archive: Yes

I ~-lu;~r~n~ 1J~~i 1'oastMirse * 13-12 Drainage a,:dSedime»t Co»trotPla» •4
TABLE 13-12.2
SOIL ERODIBILITY FACTOR -
Soil Type Soil Texture Soil Erodibility
Factor K)
Routt Cla Loam 0.28
Winevada-S litro Corn lex Loam 0.37
Binco Cla Loam 0.28
Coutis Silt Loam 0.37
Aaber Cla 0.28
S litro Loam 0.20
Winevada Loam 0.43
Foidel Silt Loam 0.28
Sk a Silt Loam 0.28
Roxal Variant Silt Loam 0.28
Spoil (Disturbed) Silt and Sand 0.16
3.4 CONTROL FACTOR, C
"I'he control factor is used to account for vegetative or mulch cover. The values utilized are shown on Table
13-12.3, Control hactor (1Zenard et al, 1996) (Schwab and Warner, 1987):
TABLE 13-12.3
CONTROL FACTOR
Cover Cover Type Vegetation Control Factor
Undisturbed Aspen/Mountain
Shrub 25% canopy (2 m fall height),
80% round cover 0.042
Sagebrush 25% canopy (2 m fall height),
80% round cover 0.042
Herbaceous No cano , 80% round cover 0.043
Mesic Draina a No cano , 40% round cover 0.100
Disturbed Bare Ground None 1.0
3.5 PRACTICE FACTOR, P
1'hc practice f,ictor is used to account for conservation practices for the watershed. The values utilized are
shown in "fable "13-12.4, Practice I~actor (Renard et al, 1996)(Schwab and Warner, 1987):
3.6 SEDIMENT PARTICLE DISTRIBUTION
~1 sediment particle size distribution was input into the SEDCAD4 computer model. The distribution was
obtained from previous analyses presented in the Seneca mine permit and is presented in the SEDCAD4
printouts.
ills»Ignirierp II%al.rrrn A1rnr»g Group * 1655. Unia» Barlrrarrl, Suite 460 *Lakewood, Colorado 80228 * [phone]
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'I'R-36 Revised 08/07