REP17628

• Permit No: C1982056
• IBM Index Class Name: Report
• Doc Date: 10/28/2004
• Doc Name: 3rd Quarter 2004 Quarterly Observation Report & Refuse Pile
• 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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Subject: Quarterly Observation Report, Refuse Pile,
Foidel Creek Mine, Routt County, Colorado.
Mr. Nettleton,
October ] 0, 2004
Twentymile Coal Company
29515 RCR #27
Oak Creek, CO 80467
Attn: Mr. Jerry Nettleton
Job Number: 99-3983
As requested, NWCC, Inc. has prepared this report outlining our observations made during the third quarter
of 2004 at the Refuse Pile, which is located at Twentymile Coal Company's (TCC) Foidel Creek Mine in
Routt County, Colorado. During this quarter, we visited the project site on July 6, 14 and 22, 2004 to test
the compaction of the waste coal materials being placed and compacted in Area 2Yz. We also visited the
project site on September 28, 2004 to provide our quarterly inspection observations.
At the time of our site visit on July 6, 2004, we took four (4) compaction tests (#278 to #281) across Area
2'/m of the refuse pile. All of the tests taken met the minimum compaction requirement of 90% of the
maximum standard Proctor density. We visited the site a second time on July ]4, 2004 and took
compaction tests on the fill materials placed in Area 2Ya. We took four (4) compaction tests (#282 to #285)
on this date. All of the tests taken on this date met the minimum compaction requvement of 90% of the
maximum standard Proctor density. We visited the site a third time on July 22, 2004 and took compaction
tests on the fill materials placed in Area 2%,. We took three (3) compaction tests (#286 to #288) on this
date. Al] of the tests taken on this date met the minimum compaction requirement of 90% of the maximum
standard Proctor density. Copies of the compaction test results and the daily field report are attached. It
should be noted that the abbreviations given in the Nuclear Density Test Results (Proctor Data) are as
follows: Maximum DD =Maximum Dry Density and OMC =Optimum Moisture Content. Both of these
values have been determined in accordance with ASTM D698/AASHTO T99.
At the time of our site visit on September 28, 2004 we met with Jerry Nettleton of RAG)Twentymiie Coal
Company at his office. Mr. Len and Mr. Nettleton completed a site inspection on this date. Based on our
observations made during this visit, it appeared that the contractor was pushing the previously stockpiled
materials in Area 3 to Area 2'/z and then compacting them with the dozer. We also observed that they were
currently stockpiling the refuse materials in Areas 1 and 2.
At the.time of our visit, we did not observe any signs of instability, structural weakness or hazardous
conditions at the pile.
[phone] • Faz [phone]
2580 Copper Ridge Drive • P.O. Box 775226 • Steamboat Springs, CO 80477