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-zl- <br /> <br />be necessary to acquire compaction equipment such as a heavy <br />grid roller to maintain the desired rate of fill placement. <br />This is an operation problem which can be worked out with appro- <br />priate field testing and observation as the construction process <br />starts. <br />Instrumentation <br />The foundation conditions at this site indicate that high <br />pore water pressures could develop within the underlying soft <br />clay layer at the base of the fill. We believe that some type of <br />instrumentation will be necessary to monitor performance of the <br />• fill at this site. We anticipate installation of pore pressure <br />monitoring devices in the toe of the major fills, benchmarks and <br />horizontal alignment markers to monitor stability of the fill. <br />This monitoring program should include at least a monthly survey <br />by mine personnel to record performance of the fill during con- <br />struction. <br />Methods of Analysis <br />Several methods of analysis were used in our evaluation of the <br />stability of these proposed disposal fills. Included in our methods <br />of analysis were the chart methods developed by Janbu, the sliding <br />wedge type analysis, the conventional method of slices, and a <br />computer routine based upon the modified Spencer's method. Gen- <br />• erally, the critical surface was roughly approximated using Janbu's <br />