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2 Environments 7.B. - Page 73 <br /> • Footings for the cantilevered retaining wall that bear on subgrade soils below an elevation <br /> of 7 feet should derive all vertical resistance (downwards and upwards) from micropiles. <br /> Any resistance to vertical loads for footings bearing on subgrade soils below an elevation <br /> of 7 feet should be neglected. <br /> • Footings that bear on subgrade soils above an elevation of 7 feet may be designed using <br /> an allowable bearing pressure of 1,000 psf. <br /> • The Contractor shall be responsible for the design of the temporary shoring needed for <br /> the construction of the wet well and retaining walls in conformance with the Caltrans <br /> Trenching and Shoring Manual. The Contractor's shoring design should be performed by a <br /> registered civil engineer and submitted to the City for review prior to construction. <br /> • The Contractor shall be responsible for the design of the temporary cofferdam needed to <br /> dewater the site to construct the joint-use path under US 101. The Contractor's <br /> cofferdam design should be performed by a registered civil engineer and submitted to the <br /> City for review prior to construction. <br /> • The site is potentially corrosive to reinforcing steel embedded in concrete structures. A <br /> corrosion engineer should be consulted to adjust the concrete mix accordingly. <br /> With the incorporation of these measures the impacts from unstable and expansive soils would be <br /> reduced to less than significant levels. (Less than Significant Impact with Mitigation <br /> Incorporation) <br /> d)Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code <br /> (1994), creating substantial risks to life or property? <br /> See the discussion of expansive soils in the analysis of item c) above. (Less than Significant Impact <br /> with Mitigation Incorporation) <br /> e)Have soils incapable of adequately supporting the use of septic tanks or alternative waste <br /> water disposal systems where sewers are not available for the disposal of waste water? <br /> The proposed project would not involve the disposal of waste water or septic tanks, and there would <br /> be no impacts from soils incapable of supporting septic tanks. (No Impact) <br /> 2.7 GREENHOUSE GAS EMISSIONS <br /> The US 101 Pedestrian Undercrossing and Bair Island Storm Drain Pump Station Project Air Quality <br /> and Greenhouse Gas Report describes the greenhouse gas regulations applicable to the project, <br /> estimates the emissions of greenhouse gases during construction and operation of the proposed <br /> project, and identifies mitigation measures for these emissions (see Appendix C). <br /> Greenhouse gases include carbon dioxide, nitrous oxide,methane, hydrofluorocarbons, <br /> perfluorocarbons,and sulfur hexafluoride. Each of these gases has a different potential for trapping <br /> heat in the atmosphere and contributing to global warming. For example, according to EPA, over a <br /> 2-33 US 101 Pedestrian Undercrossing and Bair <br /> Island Road Storm Drain Pump Station Project <br />