2007-06-29_PERMIT FILE - C1981022A ‎(2)‎

• Permit No: C1981022A
• IBM Index Class Name: Permit File
• Doc Date: 6/29/2007
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans
• Media Type: D
• Archive: Yes

Saria: - 2.05.3
Maintenance for clean water diversions will include periodic inspection for excessive erosion or
• damage and repair and clean-out az necessary to maintain an adequate channel profile and assure that
the ditches continue to function az 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 involve some discretionary judgement. 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 -Mme 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 minimi~a erosion and additional sediment
contributions and to safely pazs design flows while maintaining adequate freeboard. Where design
flow velocities would result in excessive erosive forces, adequate channel protettion u provided to
prevent erosion and down-cutting. Runoff collection ditches and berths are identified and associated
design calculations for both the ditches/berets and azsociated culverts are provided in Exhibit 2.05-
E3, Drainage and Sediment Control Plan. Ditch/berm 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, OMI
utilizes Alternative Sediment Controls where feazible in order to control drainage and sediment as
close to iu source az possible and to avoid any ttnnecessary additional surface disturbance.
Alternative Sediment Controls are also used for small-scale temporary disturbances az 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 apphcations
Where associated disturbance areas are small or isolated, OMI has received approval for the following
Small Area Exemptions in accordance with applicable provisions of Rule 4.05.2(3).
• Upper Hubbard Creek pad ourslope and soil stockpile
• Lower Hubbard Creek facilities area
• Bear Creek facilities area
• Main entrance haul road and loadout area
• Sanborn Creek Mute ponal area
• Sanborn Creek Mute overland conveyor (two SAE's)
• Coal silo and entrance road area
• Nonh Elk Creek soil stockpile
Small Area Exemptions and areas where Alternative Sediment Controls will be used are identified and
• described in Exhibit 2.05-E3, Drainage and Sediment Control Plan, and shown on the Drautage and
Sediment Control Map, (Map 2.05-M4). Exhibit 2.05-E3 also includes the documentation required
tinder Rule 4.05.2(3) for each Small Area Exemption. Small Area Exetptions and areas where
Alternative Sediment Controls are utilized will be inspected periodically for indications of damage,
PR04 2.05-37 Revised August 2000