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M03106GE <br />Our analysis was based on soil strength characteristics obtained <br />from laboratory direct shear strength tests and triaxial shear <br />strength tests of samples of soil material encountered in our test <br />borings obtained during our field study. we understand that the <br />coal gob material will be obtained from the coal wash plant. The <br />coal wash plant is currently under construction and not yet produc- <br />ing coal gob. For this reason, we obtained a sample of the gob <br />material currently being generated from the mine. In addition we <br />obtained soil strength characteristic information for other coal <br />wash plant gob material. The soil strength information for coal <br />gob material from other wash plants was provided by Mr. Jim Stover, <br />P.E., J.E. Stover and Associates. The soil strength values used <br />in our analysis included: <br />Site soil material: <br />. an internal angle of friction of twenty-four (24) degrees, <br />. cohesion of six hundred ninety (690) pounds per square foot <br />and <br />. a moist unit weight of one-hundred twenty-five (125) pounds <br />per cubic foot, and <br />Topsoil and Cover material: <br />. an internal angle of friction of twenty-four (24) degrees, <br />. a cohesion of three-hundred sixty (360) pounds per square <br />foot., and <br />. a moist unit weight of one-hundred twenty (120) pounds per <br />cubic foot. <br />Existing'Mine Coal Gob <br />an internal angle of friction of twenty-two (22) to twenty- <br />five (25) degrees, <br />a cohesion of five-hundred seventy-five (575) and <br />a moist unit weight of ninety-eight (99) pounds per square <br />foot. <br />Estimated Wash Plant Coal Gob <br />an internal angle of friction of thirty-two (32) degrees, <br />a cohesion of two-hundred (200) pounds per square foot and <br />a moist unit weight of ninety-eight (98) pounds per square <br />foot. <br />In our stability analysis we varied the soil strength values of <br />the proposed coal gob to assess the sensitivity of the analysis to <br />varying soil strength parameters of the coal gob. The variations <br />in our analysis produced relatively significant and predictable <br />I• <br />6 <br />~tam6ert ana ~,~,ooeiareo <br />GONSULTIMG GEOTEGMNIGAL ENGIN EER3 AMD <br />MATERIAL TESTING <br />