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what effects this high water table might have on the overall <br />stability and to evaluate the need, i- any, for internal drainage. • <br />The surface through the embankment was estimated by a procedure <br />developed by Casagrande (1937) for flow through a homogeneous dam <br />on an impervious foundation. In this analysis, it is assumed that <br />the water existed at the top of the pile and that it drained to the <br />toe of the embankment similar to flow through a water retention <br />impoundment. <br />A summary of the stability analysis results are presented <br />below, along with the minimum safety factors required by CMLRD <br />regulations. The "foundation" water condition relates to a ground <br />water table existing at the interface between the pile and the <br />foundation strata while the "pile" condition refers to the water <br />level. As may be seen, the stability of the embankment was found <br />to have an acceptable factor of safety for all loading conditions <br />as established by CMLRD. <br />As presented above, the stability of the waste pile was <br />found to have an acceptable factor of safety based on the selected <br />strength parameters for the waste material. The actual strength <br />parameters are presented in Exhibit 30. The static and <br />pseudostatic safety factors for the low phreatic surface were 1.87 <br />and 1.59, respectively. The static and pneudostatic high phreatic <br />surface were 1.61 and 1.44, respectively. <br />AAI 0 <br />q10 <br />20542.626 2.05 -42 revised 10/23/97 <br />Stability Results <br />Failure <br />Water <br />Safety Factor <br />Minimum <br />Surface <br />Condition <br />Calculated <br />Reauired <br />#1 Foundation <br />1.1 <br />Foundation <br />2.7 <br />1.5 <br />Interface <br />1.2 <br />Pile <br />1.6 <br />1.5 <br />#2 Random <br />2.1 <br />Foundation <br />2.7 <br />1.5 • <br />Circle <br />2.2 <br />Pile <br />1.6 <br />1.5 <br />As presented above, the stability of the waste pile was <br />found to have an acceptable factor of safety based on the selected <br />strength parameters for the waste material. The actual strength <br />parameters are presented in Exhibit 30. The static and <br />pseudostatic safety factors for the low phreatic surface were 1.87 <br />and 1.59, respectively. The static and pneudostatic high phreatic <br />surface were 1.61 and 1.44, respectively. <br />AAI 0 <br />q10 <br />20542.626 2.05 -42 revised 10/23/97 <br />