2007-07-26_PERMIT FILE - C1981022A ‎(3)‎

• Permit No: C1981022A
• IBM Index Class Name: Permit File
• Doc Date: 7/26/2007
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans
• Media Type: D
• Archive: Yes

Section - 2.05.3
Maintenance for clean water diversions will include periodic inspection for excessive erosion or
damage and repair and clean-out as necessary to maintain an adequate channel profile and assure that
the ditches continue to function as designed. On completion of active operations and reclamation of
the associated disturbance areas, the clean water diversions will be maintained through the
reclamation liability period and then removed in conjunction with sedimentation pond removal.
Ditch removal may i_nvohTe some discretior_ary judgemen±. In some cases, it may be adequate to
block the ditches and allow them to silt-in. In others, it may be necessary to backfill, regrade, and
revegetate the ditch areas.
Mine Runoff Collection Ditches and Containment Berms -Mine runoff collection ditches
and/or berms have been constructed for most mine disturbance areas to intercept disturbed area
runoff and route it to either sedimentation ponds or through alternative sediment control structures.
Runoff collection ditches and berms are designed to minimize erosion and additional sediment
contributions and to safely pass design flows while maintaining adequate freeboard. Where design
flow velocities would result in excessive erosive forces, adequate channel protection is provided to
prevent erosion and down-cutting. Runoff collection ditches and berms are identified and associated
design calculations for both the ditches/beans and associated culverts are provided in Exhibit 2.05-
E3, Drainage and Sediment Control Plan. Ditch/bean locations and configuration are shown on the
Drainage and Sediment Control Map, (Map 2.05-M4). Maintenance and reclamation practices for
runoff collection ditches and berms will be essentially the same as previously discussed for clean
water diversions.
Small Area Exemptions -and Alternative Sediment Controls - As previously discussed, OMLLC
utilizes Alternative Sediment Controls where feasible in order to control drainage and sediment as
close to its source as possible and to avoid any unnecessary additional surface disturbance.
Alternative Sediment Controls are also used for small-scale temporary disturbances as the most
effective control approach. Alternative Sediment Controls typically consists of one or a combination
of the following control measures:
• Silt fences '
• Straw bales
• Vegetative filters
• Erosion control matting
• Surface manipulations (pitting, contour ditches, surface roughening)
• Mulch applications
Where associated disturbance areas are small or isolated, OMLLC has received approval for the
following Small Area Exemptions in accordance with applicable provisions of Rule 4.05.2(3). The
specific Exhibit 2.05-E3 section has been noted where the documentation required under Rule
4.05.2(3) for each Small Area Exemption is provided.
• Upper Hubbard Creek soil stockpile (Exhibit 2.05-E3, Sec. 4, page B-142 and B-149)
• Lower Hubbard Creek facilities area (2 SAE's) (Exhibit 2.05-E3, Sec. 4, page B-141)
• Bear Creek facilities area (Exhibit 2.05-E3, Sec. 4, page B-141)
• Sanborn Creek Mine portal area (Exhibit 2.05-E3, Sec. 3)
• Sanborn Creek Mine overland conveyor (two SAE's) (Exhibit 2.05-E3, Sec. 3)
• Elk Creek Mine Area (5 SAE's: soil stockpile, Slope 1, Slope 2, North area and Storage
area) (Exhibit 2.05-E3, Sec. 9)
• CBM - Degasification Well Pad Areas (5 SAE's) (Exhibit 2.05-E3, Sec. 9)
Small Area Exemptions and areas where Alternative Sediment Controls will be used are also
identified on the Drainage and Sediment Control Map, (Map 2.05-M4). Small Area Exemptions and
areas where Alternative Sediment Controls are utilized will be inspected periodically for indications of
damage,
R ~ ~ 2.05.37 Revised October- 2002
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