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STATE OF COLORADO <br />COLORADO GEOLOGICAL SURVEY— serving the people of Colorado C OLORADO <br />Department of Natural Resources <br />1313 Sherman Street, Room 715 P FF 7 <br />Denver, CO 80203 <br />Phone: (303) 866 -2611 <br />Fax: (303) 866 -2461 Ii t <br />t)EPA1UMENT OF <br />NATURAL <br />RESOURCES <br />DATE: June 14, 2012 <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />TO: Jim Stark, Dan Hernandez, David Berry (DRMS) Vincent Matthews <br />Division Director and <br />FROM: Jon White (CGS) State Geologist <br />SUBJECT: CGS review of Haul Road (HR -1) landslide repair to the West Elk Mine RPEE (TR <br />128) and the ST -02 (coal stockpile pad) landslide repair. <br />At the request of the Colorado Division of Reclamation, Mining and Safety (DRMS), the <br />Colorado Geological Survey (CGS) is providing this review of two landslide repairs at the West Elk <br />Coal Mine. The first is the ST -02 coal stockpile pad landslide repair and the second is the RPEE <br />Haul Road 1 (HR -1) landslide repair. A site inspection was conducted with Jim Stark and Zach <br />Trujillo on April 10, 2012. At the time of the inspection the landslide repair at ST -02 was complete <br />and the repair at the haul road essentially complete except for some drainage issues and final <br />grading. <br />In addition to the site inspection, the CGS examined the following documents for this review: <br />1) Subsurface Exploration Program, Geotechnical Recommendations, Slope Evaluation and <br />Remediation report prepared by Ground Engineering Consultants, Inc. prepared October 6, 2011 <br />(Job No. 11 -6014) prepared for the ST -02 landslide, and 2) TR -128 Haul Road Slide Repair <br />Documentation, Slope Stability Monitoring Instrumentation, and Drainage Revisions prepared May <br />2012 by Barr Engineering Co. Please consider the following observations as you review the technical <br />revision that has been submitted. <br />Observations and Recommendations <br />The following review and observations are based on the site review conducted on April 10, <br />2012 and the review of the reports referenced above. For ease of review we have separated <br />comments for the two slide locations. <br />