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III IIIIIIIIIIIIIIII <br />999 <br />[ants <br />Geotechnical /Environmental Engineering • Materials Testing <br />January 7, 2002 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80467 <br />Attn: Mr. Rick Mills <br />Job Number: 99-3983 <br />Subject: Quarterly Observation Report, Refuse Pile, <br />Foidel Creek Mine, Routt County, Colorado. <br />Gentlemen: <br />As requested, NWCC, Inc. (Northwest Colorado Consultants, Inc.) has prepared this letter outlining our <br />observations made during the fourth quarter of 2001 at the Refuse Pile, which is located at the Foidel Creek <br />Mine in Routt County, Colorado. During this quarter, we visited the project site on December I I and 13, <br />2001 to test the compaction of the materials being placed and compacted, as well as to provide our <br />quarterly observations. <br />At the time of our site visit on December I I, 2001, we met with Mr. Rick Mills and Dave Wallace of <br />Twentymile Coal Company to observe the conditions a[ the Refuse Pile. At the time of our visit, it <br />appeared that the majority of the refuse materials (waste coal) that were produced during this quarter were <br />being stockpiled in Area I and the northern portion of Area 2. At the time of this visit, the client was <br />spreading and compacting the fill materials in Area I. Based on our observations, it appeared that the <br />placement of the clay cover materials and topsoil materials had been completed along the east facing side <br />of the lower bench in Area I. <br />At the time of our site visit on December 13, 2001, we conducted four (4) compaction tests (#206 to #209) <br />across the portion of the refuse pile in which the compacted lifr had been placed in Area I. A copy of the <br />compaction test results and daily report are also attached. Based on the compaction test results, it appears <br />that the fill materials are being placed and compacted in general accordance with the project specifications. <br />It should be noted that the abbreviations given in the Nuclear Density Test Results (Proctor Data) are as <br />follows: Maximum DD =Maximum Dry Density and OMC =Optimum Moisture Content. Both of these <br />values have been determined in accordance with ASTM D698/AASHTO T99. At the time of this visit, we <br />also observed that the majority of the refuse materials (waste coal) being produced were being stockpiled in <br />Area 2. <br />We were advised that they had produced approximately 14,200 cubic yards of waste coal in October; <br />approximately 15,400 cubic yards in November and approximately 17,500 cubic yards in December. <br />\ (970) 879.7888 • Fax (970) 879-7891 <br />2580 Copper Ridge Drive • P.O. Box 775226 • Steamboat Springs, CO 80477 <br />