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<br />' CHAPTER III <br />MATERIALS PROPERTIES <br />1 <br />t A. GENERAL <br />For the purposes of analyzing the stability of the waste dumps, the material <br />properties of the soils underlying the waste dumps and of the waste dump <br />material itself must be defined. <br />This chapter contains a summary of those material properties, as well as <br />' a discussion of assumptions related to design parameters, where appropriate. <br />Detailed descriptions of laboratory tests procedures and test results are <br />' contained in Appendix B of this report. <br />' The waste dump material will consist of blasted, ripped, and otherwise <br />broken fragments of shales and sandstones excavated from the mine pit. The <br />' properties of the intact shales and sandstones have been studied and previously <br />reported in the W. A. Wahler and Associates design report on open pit <br />slopes. However, no samples of the broken materials have been received <br />' or tested by W. A. Wahler and Associates. At this time we feel that expensive <br />large scale testing of fabricated samples is not warranted for this project <br />' since considerable research has been done in the past to determine Che <br />strength, modulus, and compressibility characteristics of similar materials. <br />' On the basis of available information on the parent rocks and research data, <br />reasonable estimations of the significant engineering properties of the waste <br />' dump material can be made. <br />The foundation soils at the site consist of variably weathered products <br />' of the intact shales and sandstones. Throughout this report, these foundation <br />materials are referred to as "residual" soil, or "topsoil." It was for the <br />' purpose of defining the properties of these residual soils, that the majority <br />of the sampling and laboratory testing was performed. <br />1 <br />WAWRNLER Project 0823 III-1 <br />& ASSOCIQfES <br />