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4 Environmental Analysis <br /> 4.7 Geology, Soils, and Paleontological Resources <br /> hazard assessments. Areas shall be delineated based upon data from published <br /> sources and field investigations. Maps shall be maintained and updated as new <br /> data become available. These maps shall not be used by the County to determine <br /> where hazardous conditions exist, but instead to identify the presence of conditions <br /> which warrant further study. <br /> Implementation Program 112: The County shall develop detailed guidelines for <br /> preparation of site-specific geologic hazard assessments. These guidelines shall <br /> be prepared in consultation with the County Building Official, the County Engineer, <br /> County Geologist, County Counsel, and the County Risk Manager, and shall <br /> ensure that site-specific assessments for development requiring discretionary <br /> permits are prepared according to consistent criteria. <br /> Alameda County Code of Ordinances <br /> Chapter 15.08, Building Code, requires new construction projects in areas where seismic and <br /> geologic hazards are a concern to submit a geotechnical report before the approval of the <br /> foundation will be granted. <br /> Chapter 15.18, Onsite Wastewater Treatment Systems, requires that all structures within 200 feet <br /> of a public sewer line connect to the public sewer system. Buildings not within 200 feet of a public <br /> sewer line (if they plan to build a septic system) must comply with the requirements of this <br /> Chapter. A building permit will not be granted until a construction permit has been approved for <br /> the septic system. Requirements of the permit include a site evaluation, soil profile and percolation <br /> tests, a plan review, and other requirements as directed by the County building department. The <br /> soil profile and percolation tests must be performed by a registered professional. The ordinance <br /> also requires that the septic system be properly operated and maintained. <br /> Chapter 15.36, Grading Erosion and Sediment Control, provides requirements for the control of <br /> erosion and sediments during grading and construction activities to safeguard human health and <br /> property, protect waterways, and ensure that the graded site is prepared in accordance with the <br /> Alameda County General Plan. <br /> 4.7.3 Thresholds of Significance <br /> A project is considered to have significant impacts in geology, soils, and paleontological resources <br /> if any of the following statements apply: <br /> a) Directly or indirectly cause potential substantial adverse effects, including the risk of loss, <br /> injury, or death involving: <br /> i. Rupture of a known earthquake fault, as delineated on the most recent Alquist- <br /> Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or <br /> based on other substantial evidence of a known fault (Refer to Division of Mines <br /> and Geology Special Publication 42), <br /> ii. Strong seismic ground shaking, <br /> iii. Seismic-related ground failure, including liquefaction, <br /> iv. Landslides; <br /> b) Result in substantial soil erosion or loss of topsoil; <br /> Griffith Energy Storage Project 4.7-14 Tetra Tech/SCH 2022120675 <br /> Draft Environmental Impact Report August 2023 <br />