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extremely weak. These materials should be rippable down to the required limits of excavation <br />for the drop structure. <br />The on-site materials also were tested for sulfate content and pH, and soil resistivity and <br />conductivity. These parameters are used to indicate the potential issues associated with adverse <br />reactions with concrete and metal in the structural elements. It is recommended that any exposed <br />metal in contact with native soils be protected from corrosion. <br />2.2.4 Geotechnical Analyses and Design Recommendations <br />Geotechnical analyses, described in detail in Appendix A, included slope stability evaluations of <br />temporary and permanent cut slopes, and lateral earth pressure and bearing capacity analyses for <br />the structural design. Slope stability factors of safety were determined to be adequate for <br />proposed cut and fill slopes in the vicinity of the drop structure and at one critical location on the <br />South Diversion Ditch Channel. Bearing capacity and lateral wall loading recommendations <br />based on the laboratory shear strength and compaction test results are provided in Appendix A, <br />in support of structural loading calculations (described in Section 4). Additionally, geotechnical <br />analyses and recommendations were carried out for the structural underdrain system to ensure <br />compatibility between the specified granular drain materials and sub -drain pipe perforation sizes. <br />San Luis Project - South Diversion Ditch Drop Structure - Final Design Report <br />