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eh <br />ESPEY, HUSTON & ASSOCIATES, INC. <br /> <br />The azea actually proposed for disposal in Phase I can be seen on Fig. 13.1.4. The <br />area available for use has been delineated based on the following pazameters: <br />maximize storage, minimize interference with surface drainage, avoid azeas of <br />unstable slopes, and produce a final pile that will blend in with the surrounding <br />topography. A total of 24.8 acres aze proposed for potential disposal with 4.4 acres <br />in the Phase I azea. <br />13.3.2 Slope Stability Analysis <br />The stability of the refuse fill has been analyzed for long term stability <br />based on the field and laboratory data collected by EH8cA and by others. Both the <br />Phase I Refuse Facility and the Final Refuse Facility configurations were specific- <br />ally analyzed. <br />The method of analysis used was the computer-assisted SSTABI, Slope <br />• Stability Analysis Program developed by Dr. Steven G. 'Nright, University of Texas <br />at Austin. This program uses the Spencer ivlethod of Slices to determine stability of <br />a proposed slope configuration. ~Sinor modifications in the original coding have been <br />accomplished by EH&A to adapt the program to the EH&A computer from the <br />University of Texas computer. <br />13.3.2.1 Cross Sections Analyzed <br />The cross sections analyzed for stability are shown on Figs. 13.1.3 <br />and 13.1.5 as Sections A-A' and B-B'. These cross sections have been redrawn on <br />Figs. 13.3.2 and 13.3.3 with the addition of assumed material boundazies and <br />assumed water levels after placement of the fill. <br />The material boundaries aze based on our interpretations of field data <br />collected by EH&A during installation of piezometers in !fay 1980 and on other field <br />data and interpretations furnished EH&A by Northern Coal Co. The water levels <br />• <br />13-6 <br />