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'• • Page 2 <br />(I) The mechanical properties of the tailings material, including <br />effective material friction angle (in degrees), effective cohesion <br />(in pounds per square inch), and the unit weight of the tailings <br />(in pounds per cubic foot). <br />(2) The foundation cronditions beneath the embankment, including the <br />type of surficiaZ material encountered and the depth too and type of <br />bedrock beneath the embankment. <br />(3) The depth to ground water encountered beneath the tailings embankment, <br />as well as the phreatic surface within the tailings embankment. <br />Using this collected information, Federal Resources Corporation could <br />then complete a stability analysis of the proposed tailings embankment's <br />slope stability. In this specific case, which appears relatively straight <br />forward, the applicant could consider the use of a simplistic analysis <br />method developed recently by the U.S. Bureau of Mines. This method <br />utilizes homographic charts developed by the Bureau of Mines to determine <br />a tailings embankment's approximate slope stability. This nonngraphic <br />method is admittedly conservative. The technique and charts are presented <br />in U.S. Bureau of Mine's Report of Investigation RI-8564, authored by <br />Tesarik and McWilliams. This publication, published in 1981, is entitled <br />"Factor of Safety Charts for Estimating the Stability of Saturated and <br />Unsaturated Tailings Pond Embankments". <br />If the applicant prefers, or if the results of the homographic stability <br />analysis indicate a stability problem which requires more specific analysis, <br />any of the normally exceptable rrettnds for calculating tailings embankment <br />slope stability may be utilized to complete the required stability analysis. ' <br />/ep <br />cc: Joe Zalkind <br />