_INSPECTION - C1981019 ‎(47)‎

• Permit No: C1981019
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 6/15/2010
• Email Name: JRS
• Email Name: SB1
• Media Type: D
• Archive: No

Colowyo C-1981-019
15 June 10
Pg 9/1
Backfilling and Grading (cont.): - The 2009 East Pit reclamation area was also dry at
the time of the inspection. Colowyo has fixed most of the rills in the 2009 East Pit
reclamation. Since the rills were all small in both depth and extent, they were all
fixed by hand. After they were fixed Colowyo indicated that they were reseeded. A
notable exception is a large rill on the southern-most portion of the reclamation. This
rill is/was one of the bigger rills in the East Pit. Colowyo has indicated that they would
get this fixed in the next week or two. The other more major rill (from the May 2010
inspection) was in the area north of the Prospect Ditch above the first contour ditch
(the upper-most ditch topographically). This rill formed from runoff from the rill and
gully area in the 2007-2008 reclamation block above it. Colowyo repaired this area
with a Db dozer and also repaired the rill and gully area above it. There did not
appear to be any settling, cracking or slumping in any of the 2009 East Pit
reclamation areas. These areas are overall in good condition. **See pictures at the
end of this report.**
- Based on an overlay of Map 29 - Spoil Grading South Area and Map 41 -
Watershed Boundaries for Hydrologic Monitoring, it appears as though Colowyo will
have 5 post-mining drainage channels to construct (at least in part) in 2010. All of
these channels are shown on Map 41 and there designs are shown on Map 33, Map
33A and in Exhibit 7. The first channel is the Taylor Tributary Ditch in the West Pit.
Based on the 2010 reclamation, Colowyo will need to construct the Taylor Tributary
Ditch to approximately station 45+00. Colowyo will need to construct the Taylor Ditch
in the West Pit in its entirety (station 0+00 to station 15+00). Colowyo will need to
construct the East Taylor Ditch in the West Pit from station 0+00 to approximately
station 40+00 (note, this ditch is designed to intercept the Taylor Tributary Ditch at
approximately station 1+00). Colowyo will need to construct the remaining middle
portion of the Prospect Ditch in the East Pit. The portion of the Prospect Ditch that is
in the 2010 reclamation block is from approximately station 15+00 to approximately
station 22+00. This construction will complete the Prospect Ditch. Finally, Colowyo
will need to construct the North Tributary, East Pit Ditch from approximately station
12+00 to approximately station 34+00. This will complete the North Tributary, East Pit
Ditch. In all, Colowyo will complete three post-mining drainage channels this year
(the Taylor Ditch, Prospect Ditch and North Tributary, East Pit Ditch). Once these
channels have been completed Colowyo will need to survey them and prepare an
as-built certification for each ditch. These certifications will need to be submitted to
the Division as a Technical Revision, The Division recommends Colowyo survey these
ditches immediately after they are completed to ensure they have been built to the
approved design. If not, it will be easier to fix the ditches prior to topsoil replacement
and seeding.
Support Facilities: - The Gossard Loadout area was stable at the time of the
inspection. Due to the scheduled outage at the Tri-State Craig Station, Colowyo has
very large coal stockpiles at the loadout. There was very little activity at the loadout
as Colowyo is now only hauling coal to the loadout at night.