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4 Environmental Analysis 4.15 Transportation 4.15.3 Thresholds of Significance In accordance with Appendix G of the State CEQA Guidelines, the proposed Project would have a significant transportation impact if it would: a) Conflict with a program, plan, ordinance or policy addressing the circulation system, including transit, roadway, bicycle and pedestrian facilities; b) Conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b); c) Substantially increase hazards due to a geometric design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment); or d) Result in inadequate emergency access. 4.15.4 Impacts Analysis 4.15.4.1 Methodology Trip Generation Typically, most transportation studies focus on impacts after a project is constructed and in operation, as the expected traffic generation once in operation is usually higher than that generated under any construction phase or combination of phases. For this Project, however, the reverse is true. As such, the transportation analysis presented below focuses on construction- related impacts as operation of the proposed Project would generate minimal to no peak hour trips and minimal VMT. The Project's vehicular trip generation analysis is based on data provided by the Project Applicant on proposed construction activities. Specific data used include the anticipated construction schedule, maximum number of workers onsite during each construction phase, vendor trips, and truck haul trips required to complete each phase. As discussed in the Traffic Impact Study (Appendix G), the Project has a construction schedule of approximately 15 months, including 3 months of commissioning. Total trip generation will vary depending on the specific phase and construction stage, as will each type of trip. At peak construction, there will be approximately 60 workers and 10 to 20 trucks per day. The peak period is approximately 5 months. Worker vehicle trips, vendor trips, and truck haul trips are estimated separately as they represent distinct trip types. Detailed Project trip generation calculations are provided in Appendix A of the Traffic Impact Study. For the purposes of CEQA, the values shown in Table 2-2, Construction Equipment and Vehicle Trips Per Phase, in Chapter 2. Project Description, provide a conservative scenario in that they represent the peak of Project construction activities that would occur for approximately 5 months. The Project traffic distribution is a reasonable estimate based on the battery equipment manufacturer, proximity to cities, commonality of the remaining materials like fencing and concrete, location of hotels, and size of local communities for both attractiveness for workers to stay there and likelihood that local residents would work on the Project. Based on these considerations, it is expected that the Project battery equipment would arrive by ship to the Port of Oakland, which is 47 miles from the Project location. The battery equipment would likely be delivered with standard, five-axle semi-trucks by way of I-5 to the Project location and are assumed to be 50 percent of the total materials loads. The remaining materials and equipment Griffith Energy Storage Project 4.15-12 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023