2007-07-07_PERMIT FILE - C1996083A

• Permit No: C1996083A
• IBM Index Class Name: Permit File
• Doc Date: 7/7/2007
• Doc Name: Pages EXH 8-1 to EXH 8-97
• Section_Exhibit Name: Exhibit 08 Protection of The Hydrologic Balance
• Media Type: D
• Archive: Yes

• Previously Disturbed Area
The previously disturbed aeeas are the light use roads above the
site. These roads have been invaded with oak brush and other
understory. The cover condition of the cover would be considered
poor < 30%. '
Table 2-2d-Runoff curve numbers for arid and semiarid rangelands
Cover Type -Oak-aspen-mountain brush mixture
Hydrologic Condition Poor
Soil Type -Absazokee C
Curve Number 7q
The previously disturber area also includes a small amount of the
meadow community which was also assigned a curve number of 74.
Disturbed Area
The disturbed azea is made up of basically three cover types.
They are; 1) paving; 2) coal pad and facilities and; 3) dirt slopes.
The coal pad and facilities aze considered [o be gravel surfaced.
Table 2-2a-Runoff curve numbers for urban aeeas.
Cover Type -Paved
Soil Type -Absazokee C
Curve Number 92
Cover Type -Grave]
Sty'-t T}'Fc' --9luar~kee L'
Ctitrve Number 89
Cover Type -Dirt
Soil Type -Absazokee C
Curve Number g7
Paved Area
9600 feet of road @ 24' Wide 5.3 Acres
Gravel
5.7 acre coal yard + 2 acres misc. 7.7 Acres
Dirt
The remaining disturbed area z2-7 Acres
Area that contributes run-off to ponds B & C 65.7 Acres
Weighted Average curve number for disturbed aeeas:
Area Curve # Extended
. Paved 5.3 92 7.4
Gravel 7.7 89 10.4
Dut 52.7 87 69.8
Total 65.7 87.6 Weighted average curve #
• Cuve number 87.6 will be utilized for ail of the disturbed areas.
APPRo~D
PR-0~ .S/I'i/~3 EXli-a-3a
04/03