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City of Pleasanton—Hidden Canyon Residences and Preserve Geology, Soils, and Seismicity Draft EIR 3.6-20 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-06 Geology.docx California Building Standards Code The State of California provides minimum standards for building design through the California Building Standards Code (CBC) (California Code of Regulations [CCR], Title 24). Where no other building codes apply, Chapter 29 regulates excavation, foundations, and retaining walls. The CBC applies to building design and construction in the State and is based on the federal Uniform Building Code (UBC) used widely throughout the country (generally adopted on a state-by-state or district-by- district basis). The CBC has been modified for California conditions with more detailed and/or more stringent regulations. The State earthquake protection law (California Health and Safety Code § 19100 et seq.) requires that structures be designed to resist stresses produced by lateral forces caused by wind and earthquakes. Specific minimum seismic safety and structural design requirements are set forth in Chapter 16 of the CBC. The CBC identifies seismic factors that must be considered in structural design. Chapter 18 of the CBC regulates the excavation of foundations and retaining walls, and Appendix Chapter A33 regulates grading activities, including drainage and erosion control and construction on unstable soils, such as expansive soils and areas subject to liquefaction. The CBC is updated every 3 years, and the current 2022 CBC took effect January 1, 2023. The 2022 CBC has been adopted by the City of Pleasanton as Title 20 of the Pleasanton Municipal Code (Municipal Code). Local City of Pleasanton General Plan The Pleasanton General Plan sets forth the following goals, policies, and programs related to geology and soils: Safety Element Goal 1 Minimize the risks to lives and property, and minimize the potential liability to the City due to seismic activity within the General Plan Area. Policy 1 Restrict development in areas prone to seismic safety hazards. Program 1.1 Comply with the Alquist-Priolo Act and other seismic safety criteria established by the City of Pleasanton. Policy 2 Investigate the potential for seismic hazards during the development review process, and implement soils engineering and construction standards which minimize potential danger from earthquakes. Program 2.1 Require site-specific soils, geologic, and/or geotechnical engineering studies prior to development approval of structures for human occupancy for any project proposed within areas shown on current Alquist-Priolo Earthquake Fault Zones Maps. For development within areas identified as severe through violent seismic shaking amplification (Figure 5-3: Relative Intensity of Ground Shaking) outside of the Alquist-