2011-09-19_REVISION - M1982155 ‎(17)‎

• Permit No: M1982155
• IBM Index Class Name: REVISION
• Doc Date: 9/19/2011
• Doc Name: Revised Amendment
• From: Schmidt Construction Company
• To: DRMS
• Type & Sequence: AM3
• Media Type: D
• Archive: No

Species
Rate
(lbs PLS /acre)
Intermediate Wheatgrass
5.0
Russian Wildrye
4.0
White Sweetclover
1.25
Rates are for broadcast seeding.
However, because it is unlikely that all the available soils will be stripped at one time, and
stockpile materials will continually be used for reclamation, the stockpiles will likely be
disturbed on a frequent basis and seeding the stockpiles may not be practical during the course of
the operation.
If stockpile seeding is not used, surface roughening will be maintained to limit wind and water
erosion. In place of surface roughening, using closely spaced plastic fencing laid out in a north -
south direction on the windward side (west) of the stockpiles could also be used. Although these
fences create a lot of turbulence they also act to cause windblown particles to drift between the
fences similar to a series of snow fences. Additionally, if practicable, the topsoil stockpile
should be placed east of the overburden stockpile in the stockpile area north of the pit. This may
help shield the topsoil stockpile from most of the harsher winds.
Diversions and Impoundments
Roads to the north and east of the mining area will effectively minimize stormwater surface
run -on to the mining site, therefore run -on diversion structures are not anticipated. Until late in
the overall mining operation, the amendment area mining pit will not have a surface outlet, and
stormwater that falls directly on the affected area will be contained in the pit. If stormwater flow
into the pit exceeds immediate percolation rates, a low and isolated section of the pit will be used
to allow standing water to infiltrate with time.
As the mining operation nears completion, the southern end of the pit will be contoured to drain
freely into the Rock Creek valley. As the pit is opened and drainage contours are developed,
best management practices will be used to minimize erosion and sediment transport on disturbed
areas. Best management practices may include slope flattening, rock armoring, flow velocity
and sedimentation barriers, and timely revegetation.
Material Processing and Associated Facilities
Material processing will be re- located from the existing Fountain Pit location to the amendment
area. The processing facility, potentially consisting of conveyors, screens, washers, and
crushers, will be placed in the bottom of the amendment area mine pit as soon as possible. The
mine office and scale will also be re- located to the amendment area. The below grade operation
of the processing facility will help minimize visual, noise, and dust impacts from the facility. Pit
run material will be hauled or conveyed to the processing plant and most raw material and
Fountain Pit M -1982 -155
DRMS 112 Permit Amendment Page 9