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c==~z-o5c~ <br /> <br />uitants.inc. <br />Geotechnical /Environmental Engineering • Materials <br />REC~1v~~ <br />~UL 12 20~k <br />Division et Minerals and Geo1o9V <br />Subject: Quarterly Observation Report, Refuse Pile, <br />Foidel Creek Mine, Routt County, Colorado. <br />Ladies & Gentlemen; <br />July 8, 2004 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80467 <br />Attn: Mr. Sandra White <br />lob Number: 99-3983 <br />As requested, NWCC, Inc. has prepared this report outlining our observations made during the second <br />quarter of 2004 at i:he Refuse Pile, which is located at the Foidel Creek Mine in Routt County, Colorado. <br />During this quarter, we visited the project site on May 19 and 26, and June 15, 2004 to test the compaction <br />of the waste coal taterials being placed and compacted in Areas 1, 2 and 2%z. We also visited [he project <br />site on June 29, 2004 to provide our quarterly inspection/observations. <br />A[ the time of our site visit on May 19, 2004, we took eight (8) compaction tests (#263 to #270) across <br />Areas 2 and 2'/z of the refuse pile. All but two of the tests taken (#263 & #269) met [he minimum <br />compaction requirement of 90% of the maximum standard Proctor density. Dave Wallace of Twentymile <br />Coal was advised of the areas in which the failing tests were recorded. We revisited the site on May 26, <br />2004 and took retests in the areas in which the failing tests were recorded on May ]9, 2004. These aeeas <br />Itad been reworked and recompacted and the two retests (#263A and #269A) met the required compaction <br />specification of 90° o of the maximum standard Proctor density. We visited the site a third time on June 15, <br />2004 and took compaction tests on the fill materials placed in Areas l and 2'/:. We took seven (7) <br />compaction tests (#271 to #277) on this date. All of the tests taken on this date met the minimum <br />compaction requirement of 90% of the maximum standard Proctor density. Copies of the compaction test <br />results and the daily field report are attached. It should be noted [hat the abbreviations given in the Nuclear <br />Density Test Results (Proctor Data) are as follows: Maximum DD =Maximum Dry Density and OMC = <br />Optimum Moisture Content. Both of these values have been determined in accordance with ASTM <br />D698/AASHTO T99. <br />At the time of our site visit on June 29, 2004 we met with Jerry Nettleton and Sandra White of <br />RAG/Twentymile Coal Company at [heir office. We also conducted a site inspection on this date. Based <br />on our observations made during this visit, it appeared that the contractor was pushing the previously <br />stockpiled materials in Area 3 to Area 2'h and then compacting them with the dozer. We also observed that <br />they were currently stockpiling the refuse materials in Areas I and 2. <br />(970) 879.7888 • Fax (970) 879.7891 <br />2580 Copper Ridge Drive • P.O. Box 775226 • Steamboat Springs, CO 80477 <br />