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<br />Programs PS-23 and PS-24 and the City’s Municipal Code (Geotechnical Investigation, Proposed Three-Story
<br />Townhomes, 847 Woodside Road, Redwood City, California; Silicon Valley Soil Engineering; February 18, 2020).
<br />The geotechnical report evaluated the initial set of project component plans prepared by the applicant in which the a
<br />three-story townhome building was proposed. Following subsequent redesign of the project component, an addendum
<br />to the geotechnical investigation was completed to evaluate the current project component five-story apartment
<br />building with ground floor parking (Addendum to the Geotechnical Investigation, 847 Woodside Road, Redwood
<br />City, California; Silicon Valley Engineering; February 13, 2024). The 2020 geotechnical report provides preliminary
<br />conclusions and recommendations regarding the following site-specific geotechnical issues:
<br /> site seismicity and seismic hazards, including the potential for liquefaction and liquefaction-induced ground
<br />failure (liquefaction occurs when loose, saturated soil loses strength and stiffness due to earthquake-induced
<br />ground shaking or another stress)
<br /> groundwater depth
<br /> foundation type
<br /> expansive soils
<br /> excavation and shoring
<br /> drainage and diversion of water
<br />The above interrelated issues are detailed in the geotechnical report, which also includes the technical data and analysis
<br />of four test borings and one disturbed bulk near-surface soil sample, all performed on the project component site on
<br />February 11, 2020. The geotechnical report provides recommendations for grading, water wells, foundation design,
<br />excavation, retaining walls, drainage, abandonment of existing utility lines, utility trenching, pavement design, and
<br />lime treatment to address project component-specific issues and concerns. The professional engineering-level
<br />discussion is in the original report by Silicon Valley Soil Engineering (February 18, 2020).
<br />The geotechnical report concludes that "…the site is suitable for the proposed development provided the
<br />recommendations set forth in this report are carefully followed” (p. 9).
<br />The 2024 addendum to the geotechnical report concludes that… “the information and recommendations contained in
<br />the referenced soil [geotechnical] report are still valid and conform to current geotechnical standards for the proposed
<br />development” (p. 1). The addendum provides revised foundation design criteria and updated 2022 CBC seismic values
<br />for the site. The revised recommendations call for the building’s conventional spread foundation to be founded at a
<br />minimum depth of 48 inches below finished subgrade pad elevation as compared to the previous recommendation for
<br />the foundation to be founded at a minimum depth of 30 inches below finished subgrade pad elevation.
<br />The current geotechnical report prepared for the project component, and any subsequent revisions, is subject to City
<br />review and approval, as would subsequent detailed excavation, earthwork, and foundation plans. In collaboration
<br />with a California Registered Geotechnical Engineer, the appropriate City staff would also observe onsite construction
<br />work. These conclusions are consistent with the California Building Code (CBC), the California Historical Building
<br />Code (CHBC), and the Focused GPU (Chapter 4.7, Geology and Soils).
<br />iv) The project component site is relatively flat; no impacts from landslides are anticipated.
<br />The Focused GPU EIR concluded that while the Planning Area could be subject to moderate to severe ground shaking
<br />and to liquefaction, the City’s Public Safety Element policies, the City’s development standards contained within the
<br />municipal code, and State Building Code requirements, including the project component site-specific geotechnical
<br />report, would reduce potential impacts related to geologic and seismic constraints on future development within the
<br />Planning Area to a less-than-significant level. No additional mitigation was required. Because the 847 Woodside
<br />project component would have a less-than-significant impact with compliance with the regulatory framework and
<br />incorporation of standard project conditions, the project would be consistent with the analysis within the Focused GPU
<br />EIR. It would not create new impacts or increase impacts and there is no new information of substantial importance
<br />for CEQA purposes.
<br />b. The Focused GPU EIR concluded that with implementation of Public Safety Element policies, water quality regulatory
<br />permitting requirements, and guidelines for erosion control in the Municipal Code, impacts related to erosion from
<br />future development in the Planning Area would be less than significant.
<br />The project component shall be subject to the National Pollutant Discharge Elimination System’s (NPDES)
<br />requirements, which require the preparation of a Storm Water Pollution Prevention Plan (SWPPP), and the City’s
<br />Municipal Code, which requires the preparation of precise grading plans and specifications, and erosion control plans
<br />ATTY/RESO.0074/CC RESO 847 WOODSIDE (CEQA) - EXHIBIT 1 - CEQA CONSISTENCY CHECKLIST
<br />REV: 10-23-24 VR
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