2019-10-18_REPORT - M1978208 - Laserfiche WebLink

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D,RMS SUPPLEMENTAL REPORT:Concerns in re COMPLIANCE RE BENCHING within HIGHWALL 12/6/18 MLRB 1978-208 Shaffers Crossing C%n n YLO REPORT: Notice of Inspection 3/13/18 Inspector Michael Cunningham Division of Reclamation Mining and Safety Response from Operator Prepared by MOORESJ, Min. Eng., CSM, BSc.Geol.,Geophysics(II), Elk Creek Companies, LLLP./S/Elk Creek,Sand&Gravel LLC Reviewed and Accepted/endorsed by BROCKMAN,S, PE Cave Eng. (license# ) Brockman Engineering Inc, Conifer CO 80433 12/7/18 ISSUE Inspector notified Operator Representative on or around 3/13/18 that there was an issue relating to Inspection conducted in which Inspector indicated a concern that the bench configuration within the confines of the permitted and approved highwall design was not being followed. The inspector indicated that he had participated in site walk-through and in that walkthrough he made a number of observations:a)signage was insufficient and did not comply with the terms of the Regulations enforced under the Division Rules, b)that a weed control plan was absent from the Operators file or not otherwise sufficient and that the Division was requiring that the Operator provide a technical revision to its permit such that this addressed and conformed to the regulatory requirement under the Rules to include an acceptable weed control plan c)that the Inspector was unable to visually confirm that the Operator was complying with the stipulated bench configurations, particularly the bench width relative to the bench height, in order to conform to the recommendations presented under the geotechnical report filed om behalf of the Operator in 2006 (the Brierley Geotechnical and Slope Stability Analysis) This report addresses the issue specifically of the HIGHWALL BENCH WIDTH CONFIGURATION such that the specified configuration is an 8'-0" bench no 76 degree angle of repose,and the benches are 12'-0" by 35'-0" in the perpendicular(See exhibit FIGURE 10c 2006 BEI ODP Final USES and Plan PDF)wherein the final Bench design for the highwall submitted to and accepted by DRMS Board, based upon Division recommendations,complies with the calculations and toppling or over turning moment restrictions from the 2006 Geotechnical report SPECIFIC CONCERN BY DIVISION STAFF The specific issue that was a concern raised by Vision Staff is that the prescribed bench configuration as indicated,since it did not exist,would have to be implemented in order to bring the highwall into