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r MORRISON-KNUDSEN COMPANY,INC. <br /> it <br /> The foundation material is found to be mostly clayey, gravelly sand <br /> with some interbedded clay.'I The clay layers have to be considered in <br /> the final design of the future refuse piles. <br /> The present and proposed refuse piles were re-evaluated in the light <br /> of the laboratory. test results_ It is found that the factors of safety, <br /> with the new physical characteristics , are mostly found to be higher than <br /> the previous values . Although, in one profile of the existing refuse pile, <br /> the factor of safety is slightly lower. <br /> Recommendations for data necessary for further detailed design work <br /> are made in the narrative material to follow, including large scale con- <br /> tour maps of the project area and collection of hydrological and meteoro- <br /> logical' data. ° <br /> Recommendations for detailed design of the refuse pile have also been <br /> made. Based upon more accurate hydrological data and utilizing the results <br /> of the field and laboratory geotechnical investigation, a more reliable de- <br /> sign of the refuse pile will be possible for the finally selected site. <br /> 1 .2 INTRODUCTION <br /> This study has been performed to determine, in a preliminary manner, <br /> a long range plan for disposal of refuse from the coal washing plant of <br /> the Mid-Continent Coal and Coke Company, near Redstone, Colorado. Stabi- <br /> lity of the present and proposed refuse piles had to be examined using <br /> historical and library data defining physical properties of material , hy- <br /> drological data, etc. <br /> After the commencement of the study, a program consisting of drilling, <br /> sampling and laboratory testing of the refuse and foundation material was <br /> 1-3 <br />