PERMFILE72187

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 1/26/2005
• Section_Exhibit Name: Rule 3 Performance Bond Requirements
• Media Type: D
• Archive: Yes

• 1 1), will divert runoff away from disturbed areas, and in other cases temporary ditches will
be used to divert runoff from disturbed areas to sediment ponds. Specifications for all
temporary diversions within the permit area are presented within Exhibit 7, Hydrology
Information. Temporary diversions will -be constructed to pass at a minimum the runoff from
the precipitation event with a rivo year recurrence interval.
The temporary diversions described above will have the purpose of reducing contribution of
suspended solids to runoff and diverting undisturbed drainage from the mining area. The
diversions will be constructed with a minimum gradient to pass the design flow and will be
revegeta[ed with grasses. If not removed by mining, upon completion of mining and at an
appropriate point mandated in the Coal Regulations of the Colorado Mined Land
Reclamation Board, the temporary diversions will be reclaimed as required in Section
4.05.17.
4.05.4 Stream Channel Diversions (Relocation of Streams)
A permanent diversion constructed at the operation is used to divert surface runoff from the
watershed upslope of the Streeter Fill as detailed in Section 2.06.2. The diversion structure
was designed to pass safely the 100-year, 24-hour precipitation runoff event. This diversion,
located on the north side of Streeter Fill, is riprapped, as required, to control erosion. Design
criteria for the permanent diversion structure along with engineering parameters for Streeter
Fill are set forth in Exhibit 12, Experimental Practice Information. The permanent diversion
structures will remain, but will not provide additional contributions of sediment load to Good
Spring Creek as they are designed to safely pass the 100-year, 24-hour precipitation runoff
and are stabilized with riprap. A temporary diversion of Taylor Creek was approved as a
Technical Revision on November 19, 1984. The diversion is shown on the Existing
Structures-North Map (Map 21), explained in detail in Exhibit 17, Haul Road and Facilities
Modifications associated with Colowyo's Raw Water Supply Plan.
All temporary diversions will be removed and reclaimed when no longer needed for sediment
control in accordance with the Operations and Reclamation Plan described in 2.05.4.

4.05-4