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 45 building. Therefore, the potential for subsidence or collapse is low. Therefore, this impact would be less than significant. d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial risks to life or property? (Potentially Significant Unless Mitigation Incorporated) The project site is covered by 3.5 to 4.5 feet of highly expansive clay. Expansive soils are character- ized by the potential for shrinking and swelling as the moisture content of the soil decreases and increases, respectively. The changes in soil volume can result in substantial cosmetic and structural damage to buildings and hardscape developed over expansive soils. These effects can be mitigated by moisture conditioning the expansive soil, placing non-expansive fill below slabs and foundations, designing foundations and slabs to resist ground movements associated with volume changes, supporting foundations below the zone of severe moisture change, and/or limiting moisture changes in the surficial soils by using positive drainage away from the building as well as limiting landscape watering. The Geotechnical Investigation for the proposed project provides detailed grading recommendations that address the potential impacts of expansive soils. 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 ensure that potential impacts related to expansive soils at the project site would be reduced to a less-than-significant level. e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? (No Impact) The project site is located within San Mateo County’s Fair Oaks Sewer Maintenance District.46 The wastewater conveyance system that serves the project site is maintained by the County of San Mateo but is conveyed to Redwood City’s South Bayside System Authority treatment plant.47 Development of the proposed project would not involve the use of septic tanks or alternative wastewater disposal systems. Therefore, the proposed project would have no impact related to septic tanks or alternative waste water disposal systems. 46 San Mateo, County of, 2014. County Administered Sewer and Sanitation Districts. 47 Redwood City, City of, 2010. Redwood City New General Plan, Draft Environmental Impact Report, Section 4.15 Utilities. May. ATTY/RESO.0032/PC RESO APPROVING CEQA - 860 CHARTER ST. EXHIBIT A REV: 06-15-17 PR Page 53 of 124