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SENT OY:Xerox Telecopier 7020 X12-22-93 6:26 ~ 303675~9~ 303 966 8147~tf 2 <br />DEG-21-9E TUH 14:24 LIN N DEVORE GJ E0E24 61 r. o+ <br />, ~ ~~. i. <br />~, ~ ,~- <br />•. <br />,,= ~,~ •r,'t~ <br />Lx~ooln Detibre,InG <br />-- Gsotechnlcel Goneuttente <br />1441 Motor 8t. TEL: (303) 242.89138 <br />Grand Junction, CO 87606 FAX: (303) 242.1681 <br />Mr. Tetf Duburg <br />Western Fuels - Utah <br />P.O. Box 1087 <br />Rnngely, CO 818d8 <br />• <br />• <br />RE: Coal Waste Pile Stability <br />Deaerado Nine, Rnngely, CO <br />Gentlemen: <br />December 20, 1993 <br />At your request personnel of this office have performed direct <br />shear strength testa on two bulk samples vent to this office from <br />personnel of Deserado !line. In addition, personnel of Lincaln- <br />DeVore have performed slope stability analysis of the antioipated <br />final Waste Pile configuration. Following are our findllllie. <br />Shear ~t~renath: <br />Waste Coal, without Filter Cake <br />Drr Deaeity Apparent Cohealan AaZ;le of Internal Tangent of Test <br />pof <br />-------------- pef <br />------------------- Priction <br />------ <br />°---------- Angle Type <br />~-- ----------------- <br />79.8 139 -- <br />31. t1 .eld ultlaate, <br /> Drained. <br /> Consolidated <br />79.E 39 2a.9 .48a Beeidual, <br /> Drained, <br /> Consolidated <br />tia9te Coal, with Filter Cake <br />Dry peasity Apparent Cohesion Angles of Interval TaaEaat of ?art <br />pcf yaf Friotion Angle Type <br />98.8 4b7 39.1 .SSE Ultimate <br /> Draiffed, <br /> Consolidated <br />78.8 188 18.0 .888 Residual, <br /> Drained, <br /> Consolidated <br />