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orthWest Colorad <br />Geotechnical ! Environmental Engineering • Materials Testing <br />October 9, 2015 <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 tine <br />third quarter of 2015 at the Refuse Pile located at Twentylnile Coal Company's (TGC) Foidel Creek Mine <br />in Routt County, Colorado. During this quarter, Timothy Travis of NWCC visited the project site on <br />September 30, 2015 to provide the quarterly inspection/observations of the Refuse Pile. <br />At the time of our site visit on September 30, 2015, 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. At the time of our site <br />visit the refuse coal had been placed and compacted to an elevation near the second bench along the east <br />side of the stockpile. <br />In addition, a representative of NWCC visited the refuse pile oil September 28, 2015 to conduct compaction <br />testing in the new Expansion Area of the refuse pile and the regraded surface of the existing piles in Areas <br />2, 3 and 4. A total of six compaction tests (#530 to #535) were taken in Expansion Area and Areas 2, 3 and <br />4 during this quarter. All of the tests taken during this quarter met the minimum compaction requirement of <br />90% of the maximum standard Proctor density. Copies of the compaction test results and the daily field <br />reports are attached. It should be noted that the abbreviations given in the Nuclear Density Test Results <br />(Proctor Data) are as follows: Maximurn DD = Maximum Dry Density and OMC = Optimum Moisture <br />Content. Both of these values have been determined in accordance with ASTM D698. <br />The internal roadways in the new expansion area of the pile were in good condition. The surface drainage <br />conditions generally appeared to be adequate across the top and sides of the pile. The upper haul road to <br />Areas 2, 3 and 4 of tine refuse pile was accessible at the time of our site visit. The re -grading of the drainage <br />port area previously observed in Areas 2, 3 and 4 had been completed. The grading and compaction of die <br />existing stockpiles at the top of Areas 2, 3 and 4 had also been completed, per out- previous <br />recommendations. <br />(970) 879-7888 • Fax (970) 879-7897 <br />2580 Copper Ridge Drive • Steamboat Springs, CO 80487 <br />