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C/fgo 007 <br />Kaldenbach, Tom /?IR - R'v <br />From: Welt, Kathy [KWelt@archcoal.com] <br />Sent: Friday, May 01, 2009 2:02 PM <br />To: Kaldenbach, Tom <br />Cc: Hernandez, Daniel <br />Subject: RE: West Elk Mine (C-80-007), MR-350 verification <br />Yes - and MCC has also contracted with the original design engineers to conduct a complete <br />evaluation and sensitivity analysis of the refuse characteristics and of the pile design so that we can <br />further verify the RPE stability. In fact, they were at the mine site today and took several additional <br />samples for analysis. I will forward your inquiry to them for review and comment as well. <br />xathy 'Weft, <br />Environmental Engineer III <br />Mountain Coal Company, LLC <br />P.O. Box 591 <br />Somerset, CO 81434 <br />Phone (970)929-2238 <br />Fax (970)929-5050 <br />Cell (970)433-1022 <br />From: Kaldenbach, Tom [mailto:Tom.Kaldenbach@state.co.us] <br />Sent: Friday, May 01, 2009 1:56 PM <br />To: Welt, Kathy <br />Cc: Hernandez, Daniel <br />Subject: West Elk Mine (C-80-007), MR-350 verification <br />Kathy, <br />I am trying to verify that the washed coal refuse will provide comparable slope stability to the RPE as the unwashed coal <br />refuese modeled in the original RPE design in Exhibit 70. The geotechnical data in the submittal of 4/7/09 indicates <br />adequate compaction, but a simple calculation of resisting force indicates less strength for the washed refuse than the <br />unwashed refuse (see attached spreadsheet). Can you please provide additional information or analysis that indicates <br />the washed refuse will result in slope stability comparable to the design in Exhibit 70. <br />Thank you, <br />Tom Kaldenbach <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />(303) 866-3567, ext. 8128 <br />********** Email Disclaimer ********** <br />The information contained in this e-mail, and in any <br />accompanying documents, may constitute confidential and/or <br />legally privileged information. The information is intended only <br />for use by the designated recipient. If you are not the intended <br />recipient (or responsible for delivery of the message to the <br />intended recipient), you are hereby notified that any dissemination, <br />distribution, copying, or other use of, or taking of any action in <br />reliance on this e-mail is strictly prohibited. If you have received <br />this e-mail communication in error, please notify the sender <br />immediately and delete the message from your system.