AgdaPkt 2014-10-20 Closed and Special Joint with SA_Revised_10_17_2014

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8.A. - Page 74 Section 4: Evaluation of Environmental Impacts Applicable General Plan Programs Program PS - 24 Geotechnical Analysis. Require a geotechnical analysis for construction in areas with potential geological hazards, and implement appropriate mitigation recommendations. Program PS - 25 International Building Code. Continue to implement the International Code seismic safety standards for construction of new buildings, and update the City's codes as needed to respond to new information, standards, and technology. c) Less than Significant Impact. Impacts related to liquefaction and landslides are discussed above in Section 4.6a. Lateral spreading is lateral displacement of gently sloping ground as a result of liquefaction in a shallow underlying deposit during an earthquake. Such movement can occur on slope gradients of as little as one degree. Lateral spreading typically damages pipelines, utilities, bridges, and structures. The General Plan EIR indicates that portions of Redwood City are highly susceptible to liquefaction hazards, indicating that lateral movement to an open face is possible. Thus, lateral spreading could occur in these areas. Opportunity Sites are located in or in proximity of these areas; however, General Plan Public Safety Element policies and the CBC requires all new development to have a site - specific geology report prepared by a registered geologist or soils expert and submitted to the City, which will ensure impacts related to expansive soils will be evaluated on a project -by- project basis and mitigated as necessary. Compliance with the goals and policies of the General Plan and the California Building Code will ensure potential impacts will be less - than- significant. d) Less than Significant Impact. Expansion and contraction of volume can occur when expansive soils undergo alternating cycles of wetting (swelling) and drying (shrinking). During these cycles, the volume of the soil changes markedly and can cause structural damage to building and infrastructure if the potentially expansive soils were not considered in project design and construction. The Novato and Reyes Series soils in the lowland portions of Redwood City are predominately clays and silty clays with high shrink -swell potential. The Fagan Series soils in the upland areas also have a high percentage of clay and moderate to high shrink - swell potential. The CBC requires that a soil and geological report be prepared for any development, including future potential housing. Presence of expansive soils and identification of measures to eliminate this constraint (such as removal and replacement with suitable engineered materials) will be determined through site - specific geotechnical evaluations to be conducted as part of the City's routine development review procedures. Such routine procedures will apply to all future development projects. As such, potential impacts associated with expansive soils will be less than significant. e) No Impact. Redwood City is served by the South Bayside System Authority (SBSA) for wastewater treatment. The Redwood City Public Works Services Department is responsible for operation and maintenance of the sanitary sewer collection system serving the City. Redwood City is served by a fully functional sewer system. No septic systems will be utilized in future housing. No impacts will occur. Redwood City Housing Element Initial Study 35