Reso PC17-07 0032 PC Reso Approving CEQA - 860 Charter St

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LSA ASSOCIATES, INC. SEPTEMBER 2016 ROCKETSHIP REDWOOD CITY ELEMENTARY SCHOOL PROJECT INITIAL STUDY/ MITIGATED NEGATIVE DECLARATION P:\RWC1401B Rocketship School\PRODUCTS\IS-MND\Public\Rocketship Public Review 09-29-16.docx (09/29/16) PUBLIC REVIEW DRAFT 43 Investigation for the proposed project provides detailed foundation recommendations that address the potential impacts of liquefaction. Implementation of Mitigation Measure GEO-1, which requires the project sponsor to incorporate all of the recommendations of the geotechnical investigation into the project development plans, would reduce the potential impacts related to liquefaction to a less-than- significant level. Mitigation Measure GEO-1a: The recommendations of the Geotechnical Investigation Report completed for the project shall be incorporated into all design and engineering plans, including, but not limited to, recommendations related to: site stripping, demolition of existing pavements, abandonment of utilities, removal of existing fill material, soil stabilization, and installation of new pavements. Furthermore, a licensed Geotechnical Engineer shall be retained to review the geotechnical aspects of the design and engineering plans. The Geotechnical Engineer shall be allowed sufficient time to provide the project design team with comments prior to the issuance of the final plans. The final design and engineering plans shall be submitted for review and approval to the Redwood City Community Development Department and to the San Mateo County Department of Public Works and Building Inspection’s Geotechnical Section prior to the issuance of any site-specific building or grading permits. Mitigation Measure GEO-1b: A licensed Geotechnical Engineer, or their representative, shall be retained to be provide geotechnical observation and testing during all earthwork and pavement installation activities. The Geotechnical Engineer shall be allowed to evaluate any conditions differing from those encountered during the geotechnical investigation and shall provide supplemental recommendations, as necessary. At the end of construction, the Geotechnical Engineer shall provide a letter regarding contractor compliance with project plans and specifications and with the recommendations of the Geotechnical Investigation Report and any supplemental recommendations issued during construction. The letter shall be submitted for review to the Redwood City Community Development Department and to the San Mateo County Department of Public Works and Building Inspection’s Geotechnical Section prior to issuance of a certificate of occupancy. Surface Settlement. Settlement can occur when non-saturated, cohesionless sand or gravel soil is densified by earthquake vibrations. The soils encountered above the groundwater at the project site were predominantly stiff to very stiff clays; therefore, the potential for settlement to occur is considered low and impacts associated with surface settlement would be less than significant. Landslides. Seismically-induced landslides occur as the rapid movement of large masses of soil on unstable slopes during an earthquake. The project site and surrounding areas are level or gently sloped, and the nearest hills are located over 2 miles west of the project site. Furthermore, the project site is not located within an area considered to be subject to earthquake-induced landslides.42,43 Therefore, the potential of the proposed project to expose people or structures to risk as a result of landslides is considered low. 42 Redwood City, City of, 2010. Redwood City General Plan - Public Safety Element, Figure PS-3. 43 California Geological Survey, 2006, op. cit. ATTY/RESO.0032/PC RESO APPROVING CEQA - 860 CHARTER ST. EXHIBIT A REV: 06-15-17 PR Page 51 of 124