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M <br /> OF co <br /> oI DEPARTMENT OF NATURAL RESOURCES <br /> N � � <br /> David H.Getches,Executive Director <br /> "-87 g�6 MINED LAND RECLAMATION DIVISION <br /> l �` DAVID C. SHELTON, Director <br /> Richard D Lamm <br /> Governor <br /> DATE: September 11 , 1985 <br /> TO: Fred Banta <br /> FROM: Jim Pendleton <br /> RE: MID-CONTINE RESQ�W;CE'S PATTERN OF VIOLATIONS - GEOTECHNICAL ASPECTS <br /> Pursuant to your request, I have reviewed the Notice of Violations (NOV's) <br /> cited in your Pattern of Violations Determination relating to the coal <br /> processing waste pile and rock tunnel waste pile at the Coal Basin Mine. I <br /> have reviewed these NOV's to determine whether I believe they were predictable <br /> and avoidable. I forward the following observations for your consideration. <br /> Four of the NOV's cited within Section A of your Pattern of Violations <br /> Determination related to the construction and management of the coal <br /> processing waste pile. These NOV's are C-84-50, C-84-51 , C-84-089 and <br /> C-84-135. Each of these NOV's involves the flow of coal processing waste off <br /> the waste pile site and onto topsoil or adjoining undisturbed areas of the <br /> mine site. <br /> As a portion of the abatement of these various NOV' s, the operator was <br /> required to determine whether the construction methods being utilized at the <br /> coal processing waste pile complied with previously established design <br /> criteria and construction specifications included within the approved permit <br /> documents. The operator hired Geo-Hydro Consulting, Inc., to complete the <br /> required analysis. That report was submitted to the Division by the operator <br /> on May 8, 1984. <br /> On Page 6 of Geo-Hydro Consultant's report, the consultant to the operator <br /> observes: <br /> "The existing coal refuse disposal facility was designed <br /> and permitted to be constructed with sideslopes <br /> 2(H) : 1(V). The coal refuse was supposed to be deposited <br /> in lifts not exceeding 12 inches in thickness and compacted <br /> to densities that would assure long-term stability. <br /> Densities on the order to 90 percent of maximum dry <br /> densities should generally be achieved. No end-dumping or <br /> pushing of refuse over the crest of the existing pile <br /> s nou I a be a owe . <br /> 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />