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EXHIBIT 3 <br />• <br />May 5, 1987 <br />Wyoming Fuel Company <br />12055 W. Second Place <br />P. 0. Box 15596 <br />Lakewood, Colorado 80215 <br />Attention: Mr. Steve Magnuson, Mining Engineer <br />Subject: Golden Eagle Mine <br />Refuse Pile Stability <br />Dear Mr. Magnuson: <br />This letter documents the methods and results of stability <br />Golden Eagle Mine coal processing waste pile. As discusse <br />April 20, 1987, the results indicate that minimum factors of <br />Colorado MLRD criteria under anticipated pore water pressure <br />pile. This analysis was conducted according to your request <br />March 31, 1987. <br />WASTE PILE DESCRIPTION <br /> <br />WWL 112142 <br />analyses of the <br />d by telephone on <br />safety are above <br />conditions in the <br />in a letter dated <br />From information provided by Wyoming Fuel Company, the waste pile will be <br />constructed according to Colorado MLRD requirements far coal processing waste, <br />including placement in two foot thick lifts and compaction to approximately 90 <br />percent of Standard Proctor density (for the material). <br />The pile will be constructed alongside an existing ridge, underlain by <br />sedimentary rocks. The final height of the pile (from the top of the pile to <br />the toe) will be approximately 90 feet. Overall outside slopes of the pile <br />will be 3:1 (horizontal:vertical). Soils at the waste pile site are generally <br />less than 10 feet deep, and most of these materials are to be removed prior to <br />waste material placement and stockpiled for future reclamation work. <br />GEOTECHNICAL TESTING <br />. Geotechnical tests were conducted on a representative sample of the coal <br />processing waste (or refuse) collected by Wyoming Fuel Company. Tests <br />consisted of one Standard Proctor test (ASTM D-698, Method C) with sieve <br />^' <br />Water, Waste & Land, Inc. ~: :Y/1P 19b~ <br />CONSULTING ENGINEERS 8 SCIENTISTS ~ °~ RECAV <br />i ~ ~ ~~~ <br />I-~. <br />