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D04155GE <br />The global stability analysis above indicates that the theoretical factor of safety is about 1.23, the <br />slope should be considered as marginally stable. <br />We analyzed the stability along a cross section of the talus slope located to the west of the gravel <br />pit area. This analysis is presented below. <br />The analysis of the natural slope cross section located to the west of the gravel pit area yielded a <br />theoretical factor of safety of about 1.23. Based on the analysis it appears that the overall global <br />stability of the natural slopes in the area is essentially the same as that of the gravel pit area. <br />4.0 MITIGATION CONCEPTS AND DISCUSSION <br />There are numerous concepts typically utilized for stabilization of sloped areas. The concepts <br />include conventional cantilevered retaining walls, tied back retaining structures, mechanically <br />stabilized earth fill, bumess fill along the toe of the slope, soil nailing, soldier pile and lagging, <br />sheet piles, and combinations of these and other concepts. <br />Based on our analysis discussed above, the theoretical factor of safety and global stability of the <br />gravel pit area is not significantly different than that of the adjacent areas. Mitigation of the slopes <br />above the gravel pit would still leave potentially unstable slopes in the area, therefore this effort <br />would not significantly reduce the potential exposure of the public to the natural geologic hazards <br />along the roadway or along the toe of the slope. <br />~2IYTt~TE1't ~[1T~I ~~SIIL`t~CtPS <br />CONSULTING GEOTECHNICAL ENGINEERS AND <br />-7- MATERIALS TESTING <br />