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4 Environmental Analysis 4.7 Geology, Soils, and Paleontological Resources Chapter 18 of the CBC covers the requirements of geotechnical investigations, including expansive soils (§1803); excavation, grading, and fills (§1804); load-bearing of soils (§1806); as well as foundations(§1808), shallow foundations(§1809), and deep foundations (§1810). Chapter 18 requires analysis of slope instability, liquefaction, and surface rupture attributable to faulting or lateral spreading, plus an evaluation of lateral pressures on basement and retaining walls, liquefaction and soil strength loss, and lateral movement or reduction in foundation soil-bearing capacity. It also discusses mitigation measures that can be considered for structural design, including ground stabilization, foundation type and depths, structural systems to accommodate anticipated displacements, or any combination of these measures. The potential for liquefaction and soil strength loss must be evaluated for site-specific, peak ground acceleration magnitudes and source characteristics consistent with the design earthquake ground motions. If a project is approved, then the project proponent would prepare a site-specific, design-level geotechnical report with recommendations for final project design. The design-level geotechnical report should incorporate the results and recommendations from the preliminary geotechnical report, add further details as needed to address final project design, and include all relevant mitigation measures identified in the California Environmental Quality Act (CEQA) document, conditions of approval, or other agency requirements. NPDES Construction General Permit Project construction would disturb 1 acre or more of land surface and could affect the quality of stormwater discharges into waters of the United States (WOTUS). Therefore, it would be subject to the National Pollutant Discharge Elimination System (NPDES) General Permit for Stormwater Discharges Associated with Construction and Land Disturbance Activities (Order 2009-0009- DWQ, NPDES No. CAS000002; as amended by Orders 2010-0014-DWQ and 2012-006-DWQ). See Section 4.10, Hydrology and Water Quality, for additional details. California Public Utilities Commission General Order 95 General Order 95 of the California Public Utilities Commission applies to construction and reconstruction of overhead and underground electric lines in California, including those proposed as part of the Project. The design of transmission lines must adhere to the National Electric Safety Code. Guidance documents are published by the Institute of Electrical and Electronics Engineers and American Society of Civil Engineers, including ASCE 74, Guidelines for Electrical Transmission Line Structural Loading, which states, "Transmission structures are not typically designed for vibration caused by earthquakes because these loads are less than that of wind/ice combinations." 4.7.2.3 Local The Project site falls within the jurisdiction of two counties. The proposed battery energy storage system facility and a portion of the gen-tie line are located within San Joaquin County's jurisdiction, and thus the land uses on this portion of the Project site are governed by the San Joaquin County General Plan and Zoning Ordinance. The other portion of the proposed gen-tie line, and the point of change of ownership (POCO or tie-in) with the existing PG&E Tesla Substation, however, are located within Alameda County and would be under Alameda County's jurisdiction. Griffith Energy Storage Project 4.7-11 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023