PERMFILE72283

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 4/18/2005
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans
• Media Type: D
• Archive: Yes

shaft pad for future reclamation use. The topsoil salvage volumes are indicated on Table 49A. Seeding with the
topsoil stockpile stabilization seed mixture will stabilize the windrowed and stockpiled topsoil.
Following topsoil removal, required drainage and sediment control structures will be constructed or installed.
These structures include designed culverts for the road crossing of Fish Creek (see Exhibit 8R, Fish Creek Culvert
Design, NW Mains Ventilation Shaft) and road crossings of smaller ephemeral drainage channels; a discharge
control structure (rock check dam) at the downgradient limit of the shaft pad, and a temporary diversion ditch
around the up-gradient perimeter of the shaft pad. The drainage from the shaft pad is addressed under a Small Area
Exemption (SAE), as it is a relatively small (approximately 1.8 acres), gravel-surfaced and or reclaimed area. The
access road follows relatively level terrain and will be gravel-surfaced, so access road drainage control
requirements are minimal. All drainage calculations and documentation is provided in Exhibit 8S, the SAE
demonstration is provided later in this section, and the drainage structures are shown on Map 24. The SAE
demonstration includes ditch sizing for the upland diversion ditch and road ditch.
The access road into the shaft pad crosses Fish Creek, and TCC will place "Buffer Zone" signs at the boundary of
the stream crossing disturbance. Except for the disturbance associated with the stream crossing, no further activity
is planned within the Buffer Zone boundary.
Construction of the ventilation shaft access road involves topsoil recovery and windrowing or stockpiling,
installation of required drainage structures, scarification and re-compaction of surface materials, placement of
geotextile in selected areas, and placement and compaction of approximately 8 inches of pit-run gravel and 3 feet of
road-base material. The access road surface will be approximately 22 feet wide and will be graded and crowned to
promote effective drainage. Road construction requires minimal cut, and limited fills in the area of the Fish Creek
drainage crossing. Fill slopes will be graded to a 3H:1V and stabilized by seeding with the topsoil stockpile
stabilization seed mixture. Preparation of the ventilation shaft pad involves topsoil recovery and stockpiling,
installation of required drainage structures, grading and compaction to establish a level pad working area,
excavation of mud pits for drilling of the shaft pilot hole, temporary stockpiling of the excavated material, and
placement of gravel surfacing material to control dust and sediment from the pad area. Mud pits will be
approximately 20' x 20' x 8' deep and are sized to contain all drilling fluids. In the event unanticipated ground
water flow into the boring is encountered, the pits may be enlarged or additional pits excavated to handle the flow.
The ventilation shaft pilot hole will be drilled using a reverse circulation drill rig to drill a 14 inch nominal diameter
pilot hole from the surface to a depth of approximately 1,450'. The shaft collar area will be excavated to a depth of
approximately 20 feet, a collar liner, consisting of steel ring-beams and liner plate will be placed, and the annulus
between the liner and the collaz excavation cemented. A temporary head-frame will be erected on the shaft collar
structure over the pilot hole to support and handle the shaft boring equipment. The shaft boring drive unit will be
installed on the shaft collar structure in preparation for shaft boring operations. During drilling, all drilling fluids
will be contained in the excavated mud pits and drilling fluids are generally re-circulated.
Shaft boring and casing of the approximate 20-foot diameter ventilation shaft are conducted as separate operations.
A surface-mounted drive-unit is used to turn a rotary cutting-head attached to a shaft extending from the surface
through the pilot hole, and a hoist on the temporary headframe is used to maintain continuous upward pressure on
the cutterhead. As boring progresses, the cuttings are dropped down the shaft bore and are recovered, transported,
and placed in mined-out areas underground. An alternate to transporting the cuttings to mined-out areas will be to
slurry them into the EMD sump. An underground line will be installed and the cuttings slurried to the EMD and
pumped behind the seals in the 7, 9, or 10 Right Entries. If the underground development waste cuttings are not
placed underground, they will be transported to the surface via the existing conveyance system and then will be
stored south of the old pit. The cuttings volume will be approximately 21,000 cy (16,862 cy swelled by 25
percent). The cuttings will discharge off of the existing rock belt where they will be loaded into trucks and hauled
to the previously approved overburden storage area (see Map 24 for locations). This overburden storage area is in a
previously disturbed site and within TCC's existing sediment control system. The overburden storage area is
located on a gentle slope to the south of Pit 1 (old pit).
MROS-192 2.05-45.1 03/22/05