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Traffic Impact Study Griffith Energy Storage Project 3.0 TRIP GENERATION Trip generation data for a BESS facility are not available in the Institute of Transportation Engineers Trip Generation Manual; however, detailed traffic volumes are known for the Project site from planning and scheduling of the construction activities as well as the Applicant's experience with construction and operation of similar BESS facilities. This data is included in Appendix A—Construction and Traffic Data. Trip generation is summarized in tabular format in Table 3. The values shown are conservative and may be higher than actual daily traffic. Given the short distance between urban areas and the Project site, it is anticipated that workers would be unlikely to carpool. Peak hours for the Project are expected to be between 7:00 and 8:00 AM and 5:00 and 6:00 PM, when construction workers would commute to and from the site. Once constructed, the Project would operate 7 days per week and 365 days per year. The facility would be operated by the Applicant or an affiliated company remotely. Periodic augmentation of batteries within the Project site may occur. Only occasional, on-site maintenance is expected to be required following commissioning, including replacement of inverter power modules, filters, and miscellaneous electrical repairs on an as-needed basis. No permanent sanitary facilities would be required. During operation of the Project substation, operation and maintenance staff would visit the substation periodically for switching and other operation activities. Routine operations would require one or two workers in a light utility truck to visit the facility on a weekly basis. Maintenance trucks would be utilized to perform routine maintenance, including but not limited to equipment testing, monitoring, repair, routine procedures to ensure service continuity, and standard preventative maintenance. Typically, one major maintenance inspection would take place annually. Due to the self-operating nature of the facilities and the infrequency of on-site visits, there would be no impact to peak hour traffic associated with the routine operations of the Project. Table 1. Trip Generation Daily Phase Workers Trucks Average Construction Traffic 37 20 Peak Construction Traffic 60 20 Operations 0* 0* 20-year horizon operations 0* 0* *Operations short and long term are expected approximately twice a year resulting in no trips to the site on an average day. 3.1 TRIP DISTRIBUTION 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, size of local communities for both attractiveness for workers to stay there, and likelihood that there are local residents that 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 1-5 to the Project location and are assumed to be 50% of the total materials loads. The remaining materials and equipment(construction equipment, aggregate, concrete, fencing, cables and electrical equipment, etc.) are assumed to be found locally and split 50%from Oakland and 50% from Stockton. Workers could reside in any number of local communities or hotels. Due to the close proximity of the City of Tracy and good availability of hotels and lodging there, it is likely many workers will stay there. The NTETRA TECH 7 February 2023