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• Water measurements are interpreted to indicate layers of saturated refuse <br />which form unconnected zones of "perched" water within the RDA. Buildup of water <br />at the base of the RDA was not found in the borings on the lower three benches. <br />This is interpreted to indicate that either the drain system is performing adequately <br />or the water is not travelling through the RDA to affect lower levels. <br />STABILfTY ANALYSIS <br />We performed a stability analysis of the Existing RDA and two proposed RDA <br />slope configurations. The stability analysis considered the results of the previous <br />and current field and laboratory investigations. The computer aided stability analysis <br />was performed using the program GeoslopeTM developed by Geocomp Corp. <br />(Reference 13). This computer program is based upon the slope stability analysis <br />• procedure STABL developed at Purdue University. Geoslope utilizes modified Bishop <br />analysis methods for circular-shaped failure surfaces and simplified Janbu methods <br />for non-circular surfaces. A parametric analysis of various RDA slopes, waste density <br />and strength, water conditions and earthquake conditions was performed. The <br />following sections discuss the development of the models, selection of strength and <br />density parameters, the water and earthquake conditions modelled, and the results <br />of the analysis. Stability analysis results are summarized on Figs. 5 through 8, <br />additional details and samples of individual analysis output are presented in <br />Appendix C. <br /> <br />16 <br />