_INSPECTION - C1994082 ‎(81)‎

• Permit No: C1994082
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• From: DRMS
• To: Seneca Coal Company
• Inspection Date: 7/6/2011
• Email Name: SLB
• Email Name: SB1
• Media Type: D
• Archive: No

July 6, 2011 C-1994-082/Yoast Mine SLB
Inspec:tion Topic Summary
NOTE: Y=Inspected N=Not Inspected R=Comments Noted V=Violation Issued NA=Not Applicable
NA -.Air Resource Protection N -F:oads
N -Availability of Records N -Reclamation Success
N -Backfill&Grading N -Revegetation
NA -Excess Spoil and Dev.Waste NA - Subsidence
NA -Explosives R - Slides and Other Damage
N -Fish&Wildlife NA - Support Facilities On-site
N -Hydrologic Balance N - Signs and Markers
N -Gen. Compliance With Mine Plan NA - Support Facilities Not On-site
NA -Other NA - Special Categories Of Mining
NA -Processing Waste N -Topsoil
Q
COMMENTS
This was a partial inspection of the Yoast Mine conducted by Susan Burgmaier and Sandy Brown of CDRMS.
Also present during the inspection were Jill Carlson, from the Colorado Geological Survey(CGS),assisting the
Division; Roy Karo and Jay James of Seneca Coal Company; Aril Ray of Peabody Energy; and Brian Len of
Northwest Colorado Consultants,Inc(NWCC). Weather conditions at the site were warm, sunny, and dry. The
purpose of the inspection was to evaluate areas of instability that have occurred at the site this spring, and discuss
possible solutions that would ensure long term stability.
Numerous landslides have occurred throughout Routt County this year,likely the result of an unusually wet spring
on the heels of record snowfall in the area this past winter.
One area of instability occurred in an area previously identified(CGS geologic hazard mapping of Routt County
by Allen Miller in approximately 1977)as hazardous; refer to the attached map. ,The permit area includes areas
identified as potentially unstable and mud flows; the Pond 013 area is part of an area mapped as a mudflow.
SLIDES and DAMAGE-Rule 4.12:
The neck pit area along Haul Road 13 was inspected. In this area there is a linear feature of instability
approximately 1,500' in length. This feature;varies from a scarp with 20' of vertical displacement to a small crack
with no vertical or lateral movement. CGS recommended minimal disturbance of this area to prevent compaction
that might contribute to further instability. Recommended action is to carefully grade the scarp to lessen steepness
and encourage stability(exercising caution to prevent compaction)and install toe drains to move flows out of the
slide and into the existing road ditch. The operator will broadcast seed the exposed scarp areas.
The Pond 013 slide area was also inspected. The feature:is approximately 650' in length,with a scarp height of
approximately 25'. Recommendations for this area are consistent with the neck pit: carefully grade the scarp to
lessen steepness and encourage stability(exercising caution to prevent compaction)and install toe drains to move
flows out of the slide and into existing drainages. Exposed scarps should also be broadcast seeded. Additionally,
the operator will need to reestablish the YPM-4 and YPM-4-1 postmining channels away from the slide area,
Number of Partial Inspection this Fiscal Year: 1
Number of Complete Inspections this Fiscal Year: 1
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