5A Public Hearings 2018 0507 - Laserfiche WebLink

Home

Environmental Checklist Geology and Soils Initial Study – Mitigated Negative Declaration 37 there are no open faces located within 500 feet of the site. Therefore, the potential for lateral spreading to affect the site is low. In addition, the project site is generally flat, and would not be subject to offsite landslides. However, the report indicated there is a potential for liquefaction of localized sand layers at the project site during a significant seismic event, which could result in loss, injury, or death to project site personnel. Therefore, impacts are potentially significant without mitigation. Nonetheless, the report concluded that from a geotechnical viewpoint, the project is feasible provided the considerations included in Mitigation Measure GEO-1 below are addressed in the project design. Mitigation Measures The following mitigation measure shall be implemented prior to and during project construction: GEO-1 Geotechnical Considerations. The project applicant shall implement all measures and recommendations set forth in the Geotechnical Study prepared by Cornerstone Earth Group in November 2016. These include but are not limited to:  Foundations designed to tolerate total and differential settlement  Remedial grading must include over-excavation and re-compaction of undocumented fill inside the building footprint  Slabs-on-grade should have sufficient reinforcement and be supported on a layer of non-expansive fill  Footings should extend below the zone of seasonal moisture fluctuation  Limit moisture in surficial soils by using positive drainage away from buildings as well as limiting landscaping watering  Special requirements for corrosion control must be made to protect metal pipes A project geotechnical engineer must be present during construction activities to provide geotechnical observation and testing during earthwork and foundation construction to determine compliance with project plans and mitigation. Pursuant to the 2016 Geotechnical Report for the project (Appendix A), provided the recommendations presented in the report are complied with and implemented during design and construction, construction of the project would not create hazards related to site geology or soils and the effects of liquefaction induced settlement on the proposed structure would be mitigated. Therefore, with implementation of Mitigation Measure GEO-1, the potentially significant impact associated with ground shaking and liquefaction would be reduced to a less than significant level. LESS THAN SIGNIFICANT WITH MITIGATION INCORPORATED a.4. Expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death involving landslides? The project site and surroundings are generally level, and no steep slopes are located near the project. Therefore, there is no potential for landslides at the site. No impact would occur. NO IMPACT 334