2009-11-13_PERMIT FILE - C1982056A ‎(7)‎

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 11/13/2009
• Doc Name: Pages 2.05-65 to 2.05-122.1
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans Part 2
• Media Type: D
• Archive: Yes

minimize freezing problems. The existing transfer pipeline is approximately 7,300 feet long. Any future feed line
for the water treatment ponds would be approximately 4,300 feet long. In conjunction with construction of the
6MN Mine Water Storage Reservoir, a valved connection was established on the existing transfer line, and a
• separate 6,000 foot transfer pipeline was constructed to the Reservoir to serve as a reservoir feed line.
Supplemental control equipment was added to provide for operation of the valves and to allow remote shut -off of
the submersible pump for both maintenance, and in the event of a reservoir level alarm.
In the event that TCC decides to install a water treatment system at this location in the future, water from the sump
will discharge to two ponds, each approximately 170 x 85 x 8 feet, within an area of approximately 300 x 250 feet.
The design for the treatment ponds is presented in Exhibit 8C(1), EMD Treatment Pond Design. Approximately
5,550 cy of topsoil will be salvaged and stockpiled adjacent to this pond area. As shown in Figure 1, Exhibit 8C(1),
an access road (loop) will be constructed to the treatment ponds. Approximately 740 cy of soil material will be
salvaged from the short segments of road leading to the ponds. The soil will be windrowed to the side of the road
and seeded with the topsoil stockpile stabilization seed mixture.
Prior to discharging to the ponds, the mine water will be treated using the same methods used at the Fish Creek
Dewatering Borehole to aid in the settling of suspended and dissolved materials. TCC's experience indicates that
use of these methods to pre -treat the mine water in conjunction with settling ponds, is adequate to assure
compliance with applicable water quality standards. A piping manifold or fittings and valves will allow selective
discharge to the ponds to maximize their use and efficiency. An interior line between the two ponds will allow for
flow between the ponds. A 15 -foot wide road will encircle the ponds to provide for maintenance and repairs. An
8 -inch discharge line buried approximately 4 feet deep will carry the discharge to Foidel Creek. A flow measuring
device will be used to obtain the appropriate flow measurements. A 10 x 15 x 30 foot building will house the
chemical feed system and control panels for the dewatering pump. The building will be constructed on a 10 x 3' x
0.5 foot concrete pad, as shown on Maps 17 and 18.
Sediment control for the site will consist of seeding and (if necessary) mulching the topsoil stockpiles and cut and
• fill slopes, and use of an adjacent established vegetative filter. The SAE demonstration for this area is presented in
Exhibit 8C, EMD Dewatering Treatment Facility.
Water Treatment Pilot Installation — TCC proposes to install a Water Treatment Pilot Installation, designed to
evaluate both the feasibility and costs of treating mine discharge water to meet washplant feed -water requirements
and applicable effluent water quality standards. The proposed Pilot Installation will consist of modular
components, installed in an existing disturbance area adjacent to the Washplant II Facility, as shown on Map 24
(1/4), Surface Facilities and Freshwater Systems. Operation of this facility will be limited to a brief test period of
approximately 6 -8 weeks. The system is designed to withdraw mine discharge water from the existing Area 1 Pit;
treat the water using an electro - coagulation unit, multi- media, filtration tanks, and a reverse osmosis unit, with
sampling and recycle; dewater the process waste stream; and discharge the treated water to either the Washplant II
feed -water system or Sedimentation Pond D. A site plan showing system components and a flowsheet illustrating
the treatment process are included in Exhibit 49T, along with brief explanatory notes. Following completion of the
required testing, test results will be reviewed and analyzed as the basis for planning and management decisions on
any future water treatment plans. It is anticipated that the Pilot Installation components will be disconnected and
moved off -site following completion of the required testing, although the possibility exists that some components
may be temporarily stored on -site pending review and decisions on any future water treatment plans.
6MN Mine Water Storage Reservoir (TR07 -61) - The 6MN Storage Reservoir will be used to provide back -up
storage for TLC's 10 -Right Mine Dewatering Well, allowing the well to pump continuously at full capacity,
providing buffer storage for pump maintenance or failure, and limiting the distance over which the mine water must
be transferred. The 6MN Storage Reservoir is designed as a closed reservoir, with no discharge, and provision for
adequate operating free -board to allow for storage of runoff from a small upslope drainage area. TCC will remotely
monitor and control reservoir water level, and mine water discharge to and from the 6MN Storage Reservoir, to
• maintain the water level at or below design storage capacities, and to maintain the design freeboard, at all times.
Even though the 6MN Storage Reservoir has been designed and will be operated as a closed reservoir, a single
open - channel emergency spillway has been incorporated into the design in compliance with applicable regulatory
requirements for impoundments. Any discharge of stored mine or stormwater from the 6MN Storage Reservoir,
will be directly to the mine water system, with no discharge through the emergency spillway to natural drainage.
MR09 -239 2.05 -82 09/24/09