2677 3%4 N Main Unit#WCC01 - Plan

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Project No. VP-6214-01 Verizon Wireless — Fisher Floral Other aspects of the design, including minimum reinforcement, additional posts and beams, and the need for interior footings, are to be project structural engineer. Lateral Passive Resistance CITY OF SANTA ANA Planning and Building Agency 9 � may, lS. Approved FOR PERMIT ISSUANCE g embedment, j:ggby the Date: Horizontal forces may be resisted by passive pressure acting on the side and sliding resistance. The passive pressure may be 250 psf per foot of embedment from the lowest adjacent grade up to a maximum of 4,000 ps£ Friction between base of footings and/or floor slabs, and the underlying soils may be assumed to be 40 percent of the dead loads. The allowable bearing capacity and the allowable resistance of horizontal forces may be increased by one-third for transient forces. Friction and lateral pressure may be combined, but the allowable lateral pressure should be decreased by 1/3. Corrosivity A major factor in detennining soil corrosivity is electrical resistivity. The electrical resistivity of a soil is a measure of its resistance to the flow of electrical current. Corrosion of buried metals is an electrochemical process in which the amount of metal loss due to corrosion is directly proportional to the flow of electrical current (DC) from the metal into the soil. Corrosion currents, following Ohm's Law, are inversely proportional to soil resistivity. Lower electrical resistivities result from higher moisture and chemical contents and indicate corrosive soil. Other soil characteristics that can influence corrosivity toward metals are pH, chemical content, soil type and site drainage. Based on the test results, the soils are classified as corrosive to ferrous metals and non- corrosive to Portland cement concrete. However, it is recommended to use at least Type II Portland cement for all concrete elements in contact with soil. Ferrous metals and IN