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Geotechnicai 1 Environmental Engineering - Materials <br />Celebrating 20 Years of Service <br />1992-2012 <br />October 8, 2013 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80467 <br />Attn: Mr. Jerry Nettleton <br />Job Number: 99 -3983 <br />Subject: Quarterly Observation Report, Refuse Pile, <br />Foidel Creek Mine, Routt County, Colorado. <br />Mr. Nettleton, <br />As requested, NWCC, Inc. (NWCC) has prepared this report outlining our observations made during the <br />third quarter of 2013 at the Refuse Pile located at Twentymile Coal Company's (TCC) Foidel Creek Mine <br />in Routt County, Colorado. During this quarter, Timothy Travis of NWCC visited the project site on <br />September 30, 2013 to provide the quarterly inspection/observations of the Refuse Pile. <br />At the time of our site visit on September 30, 2013, NWCC completed a cursory site inspection of the <br />existing refuse pile. Based on our observations made during this visit, it appeared that the contractor was <br />presently stockpiling and compacting the refuse coal in the new Expansion Area. NWCC was not <br />requested by TCC to conduct compaction testing during this quarter. <br />The internal roadways in the new expansion area of the pile were in good condition. The upper haul road <br />to Areas 2, 3 and 4 of the refuse pile was in fair condition. A drainage port located along the upper haul <br />road on the west side of Areas 2, 3 and 4 experienced excessive channeling during heavy rain events in <br />September, which caused the stockpile materials to wash out onto the haul road. TCC is aware of the <br />problem in this area and is planning to repair the drainage port and add rip rap to minimize future erosion. <br />NWCC also recommends re- grading of the road and drainage ditches along the upper haul road to Areas 2, <br />3 and 4. <br />Based on our observations, the surface drainage conditions, with the exception noted above, generally <br />appeared to be adequate across the top and sides of the pile. However, several shallow small shallow <br />erosion channels were observed in the refuse materials on the east, north and west sides of Areas 2, 3 and 4. <br />These shallow erosion channels were likely formed during the heavy rain events in September. We <br />recommend that these erosion channels be re- graded so that the drainage does not concentrate in these areas <br />and cause further erosion and possible slope instability. <br />(970) 879 -7888 - Fax (970) 879 -7891 <br />2580 Copper Ridge Drive - Steamboat Springs, CO 80487 <br />