2008-07-21_REPORT - C1981022

• Permit No: C1981022
• IBM Index Class Name: REPORT
• Doc Date: 7/21/2008
• Doc Name: 2nd Qtr 2008 Refuse Pile Report
• From: Oxbow Mining, LLC
• To: DRMS
• Permit Index Doc Type: Waste Pile/Fill Report
• Email Name: MET
• Media Type: D
• Archive: No

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ENGINEERING INSPECTION
EAST YARD, WEST VALLEY FILL AND H 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 20,
2008 visual inspections were performed of the East Yard, West Valley Fill and If West coal mine waste
disposal areas. A total of 5 successful compaction tests were performed on 5-07-08 and 6-24-08 and are
included herein for the Division's information.
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 and
vegetation establishment. No erosional features were noted requiring repairs to revegetated areas. 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 - No waste was hauled to the West Valley Fill during the second quarter. The
elevation of the graded waste pile remains at the approximate 6228' elevation.
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 requiring repairs to any vegetated areas.
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 continue to be utilized. 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.
H WEST - The H West disposal area received approximately 2,650 cy of additional coal mine waste material
during the second quarter of 2008. The elevation of waste material is at the approximate 6074' elevation. The
in place material has been worked to meet moisture and compaction requirements. No springs or seeps were
noted. Surface drainage control features are performing according to the plan. The rilling located near the west
edge of the fill near the permanent rock channel at the 6065' elevation was corrected by the rough grading
activities. Nothing was observed during the inspection that would indicate the H West Fill has a potential for
structural failure.
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Inspected by Jam A. Kiger
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Thomas C. Anderson Date
Colorado Licensed Professional Engineer No. 14726
3737 Hwy 133 • R0, Box 535 • Somerset, Colorado 81434 USA
TEL [phone] • FAX [phone]