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MainPlace Mall Transformation Project 12126.001 <br />3.9 Slope Stability and Landslides <br />The site is not located within a known landslide hazard area and no major fill or <br />cut slopes are currently planned for the site. Since the developed site generally <br />is relatively flat, the potential for slope instability and landslides is not considered <br />a hazard for the site. <br />Design Consideration: Slope Stability and landslide is not a design <br />consideration for the project. <br />3.10 Soil Corrosion <br />Based on the results of the previous study performed by others (ISE, 1985a; see <br />Appendix C), the site soils are reported to have a low corrosion potential on mild <br />grade steel based on the results of the testing for chloride (150 and 180 parts per <br />million) and pH (7.82 and 7.39). In addition, sulfate attack potential for concrete <br />in contact with site soils is deemed negligible based on sulfate content test <br />results (0.020% and 0.006%) reported by others (ISE, 1985a; see Appendix C). <br />Design Consideration: The site soils are not corrosive for concrete and <br />reinforcing steel embedded in concrete. However, the site soil is corrosive to <br />buried metals. General recommendations for ferrous corrosion protection <br />include use of non-ferrous pipe or protective measures to separate ferrous <br />pipes from on -site soils. Through implementation of these recommendations, <br />potential impacts relating to corrosive soils would be minimized. A corrosion <br />engineer should be retained to evaluate the specific corrosion potential of the <br />site's soils, to perform further testing as may be required, and to provide <br />specific required protective measures to reduce corrosion risk, as may be <br />necessary. <br />3.11 Soil Expansion <br />The expansive potential of onsite soils shall be determined in accordance with <br />the California Building Code 2016 Chapter 1803A.5.3 Expansive Soil. Expansive <br />soils (EI>20 per ASTM D 422) contain significant amounts of clay particles that <br />swell considerably when wetted and shrink with the loss of water. Foundations <br />and structures constructed on these soils can be subjected to uplifting forces <br />caused by the swelling, potentially resulting in heaving and cracking of both <br />building foundations and slabs -on -grade. <br />11 <br />Leighton <br />