PERMFILE128472

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 1/2/2007
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans Part 2
• Media Type: D
• Archive: Yes

anels 12-Kiehl through 16-Right, PR 99-0
. The geology description provided in PR-03 is also applicable for the NMD. One item to note is that TCC discontinued
pumping from the Fish Creek Borehole for a period of approximately 18 months. When pumping recommenced the
total recoverable iron and total dissolved solids concentmtions increased to approximately 17 mg/l and 7,200 mg/1
respectively. TCC is applying caustic soda to reduce the total recoverable iron concentration as per its CDPHE
discharge permit. TCC believes the elevated concentrations aze the results of the water stagnating in the undergound
sump. Once this pool of water is dischazged, TCC believes the concentration will return to levels previously reported
for the Fish Creek Borehole. TCC will continue to monitor the concentration, and anticipates the concentration to
return to historic levels by late summer, 2000 or 2001.
In regards to fixture impacts, TCC will not discontinue pumping of the underground sump for extended periods of
time. This will eliminate the potential for the above situation to occur in the future. Once mining is completed at
the facility, no further discharging will occur. Based upon this, there should be no impact to the postmining land
use.
Coal Refuse Pile
The Coal Refuse Pile, located to the southwest of the Area 1 Pit, as shown on Map 24, Surface Facilities, has been
designed to hold approximately 3,000,000 cubic yards of material. The refuse pile is designed to accommodate
temporary placement and permanent disposal of coal refuse materials generated from the preparation plant, excess
coal development waste material from the mine, or a combination of preparation plant and mine waste material.
This material or combination of materials will be hauled to the pile using either TCC's existing mobile equipment
fleet or contractor equipment. The original design of the Coal Refuse Pile was contracted to CTL/IZtompson. The
design was revised and updated to reduce the overall footprint and address operational placement concerns, by
Northwest Colorado Consultants. Both the original design and revisions are documented in Exhibits 26A and 26A-
1. Within 30 days of start-up of the prepazation plant, a sample of the waste material generated from the
preparation plant was obtained and analyzed to verify the assumptions used for the pile design presented in Exhibit
26A. TCC forwarded results of this analysis to the Division along with a certified statement from a registered P.E.
summarizing the results of the analyses as compared to the original design assumptions. The surface
runoff/diversion system design for the pile was developed in-house by TCC and is presented as Appendix D to the
CTL/'I'hompson Report. The locations of the Coal Refuse Pile and associated drainage features aze shown on Map
24, Surface Facilities.
As shown on Exhibit 26A, Figure 1, the refuse pile is constructed west of the reclaimed valley to the west of the
Area 1 Pit. Prior to construction, approximately 18 inches of topsoil from within the pile footprint were removed
and placed in topsoil stockpile SF-12 (see Map 29). During reclamation of completed pile benches, suitable cover
materials and topsoil will be redistributed over the face of the pile. Direct placement of topsoil will occur to the
extent possible during the bench reclamation/pile extension process. It is anticipated that topsoil replacement will
stay one bench below the active working zone of the pile. During constmction of the refuse pile, inactive portions
of topsoil stockpile SF-12 will be seeded with the topsoil stabilization seed mixture at the first appropriate
opportunity following stockpiling operations. Table 49A, Topsoil Stockpile Summary, has been revised to show
the potential modification to the existing stockpile SF-12 resulting from the construction of the refuse pile. Also,
the table presents information for all other Twentymile topsoil stockpiles. The stockpile identification numbers in
the table correlate with the stockpile designations presented on Map 29.
SpoiUsubsoil material will be used as suitable, non-toxic cover, to be placed over completed refuse benches prior to
topsoil replacement. During development of the refuse pile, spoil/subsoil material will be selectively removed from
within the footprint of the pile. The spoiUsubsoil will normally be hauled directly to an active reclamation area and
spread over the completed refuse bench. After placement of the spoil/subsoil material, the area will be topsoiled, as
previously described. Redistributed topsoil will be seeded with the pastureland seed mixture.
TROS-49 2.05-96 Revised -May 2005