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Kulhawy and Mayne (1990), assuming cohesion is negligible. Figure 2 -2 provides a histogram of <br />frequency of friction angles in which all friction angles above 45 degrees have been removed such <br />that not too much weight is given to the higher values. Figure 2 -3 provides a plot of the undrained <br />shear strength determined from a blow count correlation developed by Hara et al. (1971), assuming <br />friction is negligible. Figure 2 -4 provides a histogram of frequency of undrained shear strength <br />values. Similarly to the friction angle histogram, all undrained shear strengths greater than 6,000 psf <br />have been removed. These are the strength values based on the same blow counts for which the <br />resulting friction angles higher than 45 degrees were removed. Data on which the analysis is based is <br />provided in Appendix B. <br />Based on this analysis, assuming that SPT test results are for a material with no cohesion (friction <br />only, c =0), it can be concluded that: <br />• Friction angle is approximately 30° or higher (value selected for the cumulative 10% of all <br />friction angles, or the value for which 90% of the values are higher) <br />0 Friction angle is approximately 38° degrees or higher (value selected for the cumulative 50% <br />of all friction angles, or the value for which 50% of the values are higher) <br />Alternatively, assuming that SPT test results are for a material with no friction (cohesion only, (p =0), <br />it can be concluded that: <br />• Cohesion is about 3333 psf or higher (value selected for the cumulative 10% of all cohesion <br />values, or the value for which 90% of the values are higher) <br />• Cohesion is about 4750 psf or higher (value selected for the cumulative 50% of all cohesion <br />values, or the value for which 50% of the values are higher) <br />Model parameters listed in Table 1 were selected based on this analysis. To obtain conservative <br />modeling results, the values correlating to the lower 10 percent of friction and cohesion values were <br />used in the analysis. In other words, 90 percent of the values resulting from the data review provide <br />better friction or cohesion values than the values used in the model. <br />. 5 `k o <br />2 <br />Revised March 19, 2010 Pi g P <br />P:\Mpls \06 CO\26 \06261003 MCC Refuse Pile Site Review & Permit\WorkFiles\Permit Application \Text\2010- 04- 19_RPE East Permit Application.doc 5 <br />