2014-07-11_REPORT - C1981022

• Permit No: C1981022
• IBM Index Class Name: Report
• Doc Date: 7/11/2014
• Doc Name: 2nd Quarter Coal Mine Refuse Pile Inspection Report
• From: Oxbow Mining, LLC
• To: DRMS
• Permit Index Doc Type: Waste Pile/Fill Report
• Email Name: BFB
• Media Type: D
• Archive: No

W MINING, LLC
ENGINEERING INSPECTION
EAST YARD, WEST VALLEY FILL AND II WEST
COAL MINE WASTE DISPOSAL PILES
The approved Oxbow Mining, LLC (OMLLC) Mine permit includes a requirement for quarterly inspections of
coal mine waste piles for stability. The inspection is to be performed by a registered engineer or other qualified
professional specialist, who is experienced in the construction of earth and rockfill embankments. On June 26,
2014 visual inspections were performed of the East Yard, West Valley Fill and 11 West coal mine waste disposal
areas. No compaction tests were conducted during the quarter.
EAST YARD - The East Yard disposal area has reached its design capacity, and no new waste material has been
placed since June of 2001. The revegetated slope was inspected for signs of erosion or instability. No erosional
features were noted on the slope. The covering of the waste pile is considered complete. Nothing was observed
during the inspection that would indicate the pile has a potential for structural failure.
WEST VALLEY FILL — During the second quarter, no waste material was hauled to the West Valley Fill area.
The refuse pile remains surveyed at the approximate 6228' elevation. The active waste storage area will
continue to be available as an interim storage area for wet refuse rehandled later to II West and a staging area for
miscellaneous projects. Due to the idling of the mine, the area presently serves as a temporary parking lot for
out -of- service mine equipment.
The revegetated outslope located between the fill slope toe to the approximate 6200' elevation was inspected for
signs of erosion and instability. No erosional features were noted on the slope. The third bench (approximate
6200' elevation) setback remains established for the final lift of waste material and the ramp constructed on the
waste pile to provide access to the II West Coal Refuse Facility light use road and haul road. These two roads
continued to be utilized during the quarter. No springs or seeps were noted. Surface drainage control features
are performing according to the plan. Nothing was observed during the inspection that would indicate the West
Valley Fill has a potential for structural failure.
II WEST — The II West disposal area received no additional coal mine waste material during the second quarter
of 2014. II West waste remains at the approximate 6141' elevation. The 2013 regraded outslope area seeded on
November 7, 2013 appeared stable with initial germination of seeded species. A few thistles were sprayed with
herbicides. Older seeded areas continue to perform according to the plan. No springs or seeps were noted.
Surface drainage control features are performing according to the plan. The underdrain continues to be extended
to the north and covered with filter fabric material according to the plan. Nothing was observed during the
inspection that would indicate the II West Valley Fill has a potential for structural failure.
3737 Hwy 133 • P.O. Box 535 ° Somerset, Colorado 81 434 USA
EL [phone] ° FAX [phone]
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Benjamin L. Godwin
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3737 Hwy 133 • P.O. Box 535 ° Somerset, Colorado 81 434 USA
EL [phone] ° FAX [phone]