Laserfiche WebLink
SCOPE OF STUDY <br />• This report presents the results of a geoteduiical investigation <br />and analysis for the Coal Refuse Pile proposed at Snowmass Coal <br />QanQanny's North '~~ompson Creek Mine, Carbondale, Colorado. The report <br />is intended to satisfy requirements of 30 CFR 817.85 as directed by <br />Mined Land Reclamation in their letter to Western Associated Coal <br />Corporation dated December 12, 1979. The report presents the results <br />of slope stability analyses of the refuse pile for static and <br />pseudo-static loading conditions. The properties of the refuse and the <br />overburden material were determined by oomprrhensive field and <br />laboratory testing as discussed in this report. In addition, a <br />geotechnical investigation and slope stability analysis was made for <br />the sedimentation pond dam located at the tce of the pile. This <br />information will be also be partly utilized by the consulting <br />• hydrologist and geologist in evaluating the effectiveness of the dam in <br />preventing seepage flow into the creek. <br />The following paragraphs briefly describe our investigations and <br />results of the analysis and recommendations for the project. <br />I. REFUSE PILE <br />PI~PUSED OONS1'RUCTION. We understand that coal refuse will be <br />placed by the horizontal lift and terrace method. Ead~ lift will be <br />built in 1-to 2-foot layers to a maximum height of 44 feet. A bench <br />having a maximum width of 20 feet will be built between eadi lift. The <br />effective slope of the refuse was initially limited to 22.5' from the <br />U <br />