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MORRISON-KNUDSEN COMPANY,INC. <br /> II� <br /> fuse pile indicated that slope configuration should be limited to a 300 at <br /> • 250' height, or 270 at 300' height in order to maintain factors of safety <br /> of approximately 1 . 5 as outlined in MESA publications . <br /> On June 21 , 1977, a field investigation program was authorized by <br /> Mid-Continent to determine the actual physical characteristics of the cur- <br /> rent- refuse pile and foundation materials. The field investigation pro- <br /> gram was not a part of the original scope of work and was performed as a <br /> result of Contract Change Notice No. 1 . <br /> The program consisted of drilling, trenching, collection of samples, <br /> measurement of in-situ material density and subsequent laboratory geotech- <br /> nical testing of samples from the refuse pile and the foundation materials. <br /> The field investigation was carried out by Engineering Testing l.aborator- <br /> ies of Phoenix, Arizona, under the supervision of a M-K geotechnical engi- <br /> neer. The samples underwent laboratory testing by Wahler and Associates <br /> of Palo Alto, California. A report of the results of the testing program <br /> was provided detailing analysis results in December, 1977. <br /> Samples of both the refuse and foundation materials were collected <br /> from the existing and proposed coal refuse disposal areas . Various tests <br /> were performed on the samples to determine their physical characteristics <br /> such as density, moisture content, gradation, type, shear strength and <br /> permeability. The results indicate that 90 per cent of the refuse mater- <br /> ial is -3" in size. The material has slightly higher angle of friction <br /> than that reported for other coarse refuse material . The Mid-Continent's <br /> Coal refuse material is somewhat different from most others in that the <br /> fine and coarse materials are disposed together in a "closed system" , rather <br /> C� than placing them separately. <br /> 1-2 <br />