2009-10-13_REPORT - C1981022

• Permit No: C1981022
• IBM Index Class Name: Report
• Doc Date: 10/13/2009
• Doc Name: 3rd Quarter 2009 Coal Mine Refuse Wastepile
• From: Oxbow Mining, LLC
• To: DRMS
• Permit Index Doc Type: Waste Pile/Fill Report
• Email Name: MLT
• Media Type: D
• Archive: No

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1`0`0 MINING ILL
THIRD QUARTER 2009
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
September 25, 2009 visual inspections were performed of the East Yard, West Valley Fill and II West coal
mine waste disposal areas. Three successful compaction tests were performed during the quarter on September
17, 2009. Copies of the tests are attached 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 - During the third quarter, no waste was hauled to the West Valley Fill area. The
elevation of the waste pile was surveyed at the approximate 6231' elevation. This existing waste will be
rehandled to II West at a later time.
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.
III WEST - The II West disposal area received approximately 1,910 CY of additional coal mine waste material
during the third quarter of 2009. The elevation of waste material is at the approximate 6098' elevation. The
material has been worked to meet compaction requirements. No springs or seeps were noted. Surface drainage
control features are performing according to the plan. The recent fall seeded areas remain stable and initial
vegetative establishment considered good. Nothing was observed during the inspection that would indicate the
11 West Fill has a potential for structural failure.

Inspected by James VKiger
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Thomas C. Anderson Date
Colorado Licensed Professional Engineer No. 14726
3,737 Hwy 133 • RO Box 535 a Sornerse.t, Colorado 81434 (!SA
FEL (970) 929-51 22 • FAX [phone]