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REP15717
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REP15717
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Entry Properties
Last modified
8/24/2016 11:45:11 PM
Creation date
11/27/2007 1:42:50 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
1/9/2006
Doc Name
4th Qtr 2005 Refuse Pile Report
From
Northwest Colorado Consultants Inc
To
Twentymile Coal Company
Permit Index Doc Type
Waste Pile/Fill Report
Media Type
D
Archive
No
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t Colorado Consultants. Inc. <br />Geotechnical /Environmental Engineering • Materials Testing <br />REDEIVED <br />JAN 0 ~ 2006 <br />January 4, 2006 <br />Twentymile Coal Company <br />29515 RCR #27 <br />Oak Creek, CO 80467 <br />;petals ana Gedo9Y Attn: Mr. Jerry Nettleton <br />D.r~~spn of M <br />Job Number: 99-3983 <br />Subject: Quarterly Observation Report, Refuse Pile, <br />Foidel Creek Mine, Rout[ County, Colorado. <br />Dear Mr. Nettleton, <br />As requested, NWCC, Inc. has prepared this report outlining our observations made during the fourth <br />quarter of 2005 at the Refuse Pile, which is located at Twentymile Coal Company's (TCC} Foidel Creek <br />Mine in Routt County, Colorado. During this quarter, we visited [he project site on November 10, 2005 to <br />test the compaction of the processed waste coal being placed in Area 2 ///z. We also visited the project site <br />on December 29 2005 to provide out quarterly inspection observations. <br />At the time of our site visit on November 10, 2005, we took 4 compaction tests (#303 to #306) in Area 2t/z <br />of the refuse pile. All of the tests taken met the minimum compaction requirement of 90% of the maximum <br />standazd Proctor density. Copies of the compaction test results and the daily field report are attached. It <br />should be noted that the abbreviations given in the Nuclear Density Tes[ 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. <br />At the time of our site visit on December 29, 2005, we completed a site inspection of the pile with Jerry <br />Nettleton of Twentymile Coal Company. Based on our observations made during this visit, it appeared that <br />the contractor was presently stockpiling the refuse coal in Area 2 t/z of the pile. The surface drainage <br />conditions appeared to be adequate across the [op of the pile. However, i[ should be noted that the ground <br />surfaces for the pile were covered with several feet of snow, which hindered our observations of the actual <br />ground surfaces. <br />At the time of our visit, we did not observe any signs of instability, structural weakness or hazardous <br />conditions at the pile. <br />As suggested, the water levels in the monitor wells installed on October 23, 1997 and December 9, 1999 <br />were measured during this quarter on a monthly basis. A table and graphs showing the monthly water <br />levels are attached. <br />(970) 879-7888 • Fax (970) 879.7891 <br />2580 Copper Ridge Drive • p.0. Box 775226 • Steamboat Springs, CO 80477 <br />
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