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TA. - Page 69 <br /> LSA ASSOCIATES, INC. ROCKETSHIP REDWOOD CITY ELEMENTARY SCHOOL PROJECT <br /> SEPTEMBER 2016 INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br /> building. Therefore,the potential for subsidence or collapse is low. Therefore, this impact would be <br /> less than significant. <br /> d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), <br /> creating substantial risks to life or property?(Potentially Significant Unless Mitigation <br /> Incorporated) <br /> The project site is covered by 3.5 to 4.5 feet of highly expansive clay. Expansive soils are character- <br /> ized by the potential for shrinking and swelling as the moisture content of the soil decreases and <br /> increases,respectively. The changes in soil volume can result in substantial cosmetic and structural <br /> damage to buildings and hardscape developed over expansive soils. These effects can be mitigated by <br /> moisture conditioning the expansive soil,placing non-expansive fill below slabs and foundations, <br /> designing foundations and slabs to resist ground movements associated with volume changes, <br /> supporting foundations below the zone of severe moisture change,and/or limiting moisture changes <br /> in the surficial soils by using positive drainage away from the building as well as limiting landscape <br /> watering. The Geotechnical Investigation for the proposed project provides detailed grading <br /> recommendations that address the potential impacts of expansive soils. Implementation of Mitigation <br /> Measure GEO-1,which requires the project sponsor to incorporate all of the recommendations of the <br /> geotechnical investigation into the project development plans,would ensure that potential impacts <br /> related to expansive soils at the project site would be reduced to a less-than-significant level. <br /> e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water <br /> disposal systems where sewers are not available for the disposal of waste water?(No Impact) <br /> The project site is located within San Mateo County's Fair Oaks Sewer Maintenance District.46 The <br /> wastewater conveyance system that serves the project site is maintained by the County of San Mateo <br /> but is conveyed to Redwood City's South Bayside System Authority treatment plant.47 Development <br /> of the proposed project would not involve the use of septic tanks or alternative wastewater disposal <br /> systems. Therefore,the proposed project would have no impact related to septic tanks or alternative <br /> waste water disposal systems. <br /> 46 San Mateo,County of,2014.County Administered Sewer and Sanitation Districts. <br /> 47 Redwood City,City of,2010.Redwood City New General Plan,Draft Environmental Impact Report,Section 4.15 <br /> Utilities.May. <br /> P:1RWC1401B Rocketship Sch-I\PRODUCrSUS-MND1Public\Ra ketship Public Review 09-29-16.docx(09/29/16)PUBLIC REVIEW DRAFT 45 <br /> ATTY/RESO.0084/CC RESO ADOPTING CEQA-ROCKETSHIP CHARTER SCHOOL APPEAL <br /> REV:09-05-17 VR Page 53 of 124 <br />