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. COlO,p` <br /> NQ p DEPARTMENT OF NATURAL RESOURCES <br /> David H.Getches,Executive Director <br /> MINED LAND RECLAMATION DIVISION <br /> 1� D"ID C.SHELTON, Director <br /> Richard D.Lamm <br /> Governor <br /> DATE: April 24, 1984 <br /> TO: Jim Herron <br /> FROM: Jim Pendle;'nes' <br /> ` <br /> RE: Coal Basin nveyor and Storage Bin Technical Revision Application <br /> Pursuant to your request, I have reviewed the technical revision application <br /> submitted by Mid-Continent Resources, Inc. The operator proposes to install <br /> approximately one mile of 48" conveyor, two 20,000 ton raw coal storage bins, <br /> and an underground tunnel and conveyor from the storage bins to the existing <br /> wash plant. <br /> The applicant commits to removal of all structures and the restoration of the <br /> approximate original contour of the affected sites. The applicant does <br /> however, include a note reserving "The right to not return its private lands <br /> to A.O.C. if they are appropriate to the approved post-mining land use". Any <br /> applicant may pursue approval of an appropriate variance from A.O.C. , under <br /> various sections of the Division' s rules and regulations. However, failing <br /> Division approval, the operator is required to reestablish approximate <br /> original contour of affected lands. <br /> The revision application contains a report of geotechnical investigation and <br /> stability analysis prepared by Geo-Hydro Consultants, Inc. , consultant to the <br /> operator. The stability analysis, based upon appropriate materials strength <br /> analyses and accepted analytical techniques, demonstrates that the design <br /> slopes should achieve a minimum static slope safety factor of 1.55, which <br /> exceeds the required regulatory minimums. The analysis and accompanying <br /> engineered designs, however, assume fill placement in lifts less than one foot <br /> in thickness and compacted to exceed 90% of the ASTM D698-74 standards. <br /> In my opinion the geotechnical aspects of Mid-Continent Resources' revision <br /> application do satisfy the requirements of the Division's rules and <br /> regulations. Assuming appropriate certification and inspection, in order to <br /> assure compliance with the proposed engineering designs, I recommend approval <br /> of the revision application as proposed. <br /> /ep <br /> cc: Brian Munson <br /> Doc. No. 0969 <br /> 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (30.") 866-3567 <br />