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XBoW PAWING LLC <br />SLIAMINK _� r.._'°�k'r <br />ENGINEERING INSPECTION <br />EAST YARD, WEST VALLEY FILL AND II WEST <br />COAL MINE WASTE DISPOSAL PILES <br />The approved Oxbow Mining, LLC (OMLLC) Mine permit includes a requirement for quarterly inspections of <br />coal mine waste piles for stability. The inspection is to be performed by a registered engineer or other qualified <br />professional specialist, who is experienced in the construction of earth and rockfill embankments. On December <br />18, 2012 visual inspections were performed of the East Yard, West Valley Fill and II West coal mine waste <br />disposal areas. No compaction tests were performed during the quarter. <br />EAST YARD - The East Yard disposal area has reached its design capacity, and no new waste material has been <br />placed since June of 2001. The revegetated slope was inspected for signs of erosion or instability. No erosional <br />features were noted on the slope. The covering of the waste pile is considered complete. Nothing was observed <br />during the inspection that would indicate the pile has a potential for structural failure. <br />WEST VALLEY FILL — During the fourth quarter, no waste was hauled to the West Valley Fill area. The refuse <br />pile was surveyed at the approximate 6226.8' elevation. The active waste storage area will continue to be an <br />interim storage area for wet refuse rehandled later to II West and a staging area for miscellaneous projects . <br />The revegetated outslope located between the fill slope toe to the approximate 6200' elevation was inspected for <br />signs of erosion and instability. No erosional features were noted on the slope. The third bench (approximate <br />6200' elevation) setback remains established for the final lift of waste material and the ramp constructed on the <br />waste pile to provide access to the II West Coal Refuse Facility light use road and haul road. These two roads <br />continue to be utilized. No springs or seeps were noted. Surface drainage control features are performing <br />according to the plan. Nothing was observed during the inspection that would indicate the West Valley Fill has a <br />potential for structural failure. <br />II WEST — The II West disposal area received no additional coal mine waste during the fourth quarter of 2012. <br />II West waste is at the approximate 6126.1' elevation. The material continued to be worked to meet compaction <br />requirements. The rock underdrain crest was extended to accommodate additional waste. The regraded outslope <br />2012 annual addition was seeded on November 15, 2012 with the Oxbow mix. Older seeded areas have <br />performed according to the plan. No springs or seeps were noted. Surface drainage control features are <br />performing according to the plan. A portion of the East Surface Rock Channel remains temporarily covered with <br />fabric and road materials while being used as an access ramp to the pile. The access ramp will need additional <br />gob material and soil cover to achieve design grade. Nothing was observed during the inspection that would <br />indicate the II West Fill has a potential for structural failure. <br />. - <br />/ Inspected by James A. Kigr <br />2o/ <br />Thomas C. Anderson Date <br />Colorado Licensed Professional Engineer No. 14726 <br />3737 Hwy 133 • P.O. Box 535 • Somerset, Colorado 81 434 USA <br />TEL (970) 929 -51 22 • FAX (970) 929 -51 77 <br />