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�w CO3 <br /> 9 <br /> y� p' DEPARTMENT OF NATURAL RESOURCES <br /> David H.Getches,Executive Director <br /> MINED LAND RECLAMATION DIVISION <br /> 187 <br /> DAVID C.SHELTON, Director <br /> Richard D.Lamm <br /> Governor <br /> 0 <br /> MEMORANDUM <br /> DATE: July 12, 1984 <br /> TO: Jim Herron <br /> FROM: Jim Pendleton <br /> RE: Supplemental Co - Mid-Continent Resource' s Permit Revision <br /> Application­f New Coal Processing Waste Disposal Structure <br /> On June 27, 1984, I forwarded my geotechnical adequacy review memo to you, <br /> regarding Mid-Continent's permit revision application to construct a 7.8 <br /> million cubic yard coal processing waste pile on the Sutey partial . <br /> Subsequent to my review, Roy Cox has completed a thorough adequacy review of <br /> the ground water hydrologic aspects of the permit revision application. Roy's <br /> observations have brought to light an additional concern relating to both <br /> ground water hydrology and geotechnical stability of the proposed file. I <br /> apologize for the timing of this comment, but I believe it is significant <br /> enough to require a response by the applicant. <br /> The proposed coal processing waste disposal structure will be founded on an <br /> accumulation of low-permeability alluvial cross/colluvial materials adjourning <br /> Coal Creek. The stability analyses performed assumed this foundation material <br /> to be drained. However, because of the low observed permeability of this <br /> high-clay content material , careful control of material placement and loading <br /> rate might be necessary to assure that this assumption is correct. Loading at <br /> a rate exceeding the material 's ability to dewater and consolidate might lead <br /> to a pore water pressure related foundational failure. The applicant should <br /> respond to this concern, in order to demonstrate that the pile's design <br /> appropriately accommodates the possibility of such a poor fluid pressure <br /> related foundational failure. <br /> cc: Brian Munson <br /> Roy Cox <br /> JAP/baw <br /> Doc. No. 2753 <br /> 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />