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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project CalEEMod to calculate emissions from grading. Water for dust control and other construction needs would be trucked to the site. The Project would comply with SJVAPCD Rule 8021 to control dust emissions generated during grading activities. During the site and substation preparation and grading subphase,four generators will be used: two will operate eight hours per day and two will operate 24 hours per day. The second stage would involve construction of the energy storage enclosures and substation installation.A substation pad for the step-up transformer would be poured, followed by the installation of the medium- voltage stations,wiring of the modules through combiner boxes, and construction of the Project substation and grid interconnection. The medium-voltage stations would sit on concrete foundations or driven piles, pending final design. Off-road equipment in the CaIEEMod model conservatively assumed that equipment for concrete foundations would be required. The third stage would be installation of the gen-tie line foundation and tower erection. The fourth stage would continue the gen-tie line installation including the pulling and stinging of the wires. The fifth and final phase of construction will include commissioning and testing. The onsite construction workforce would consist of laborers, craftspeople, supervisory personnel, and support personnel. The onsite assembly and construction workforce is expected to reach a peak of approximately 60 workers; the average number of workers onsite is anticipated to be between 10 and 60 workers, depending on the construction phase. On average, it is anticipated that each worker will generate one round trip to the Project per workday. Workers could reside in any number of local communities or hotels. Due to the proximity of the city of Tracy and good availability of hotels and lodging there, it is likely many workers will stay there. The other closest residential locations to the Project are the hotels in Ulmar, Livermore, and Pleasanton. Additional nearby communities include Verona, Asco, Dublin, Lathrop, and Manteca. The nearest large urban areas are Tracy (9 miles, 18 minutes) and Ulmar (12 miles, 18 minutes). Because both are close in proximity, both will be included in analysis as possible commuting locations. Because so many local communities exist, the analysis did not consider all possible locations. It has been simplified to be representative and conservative. The communities in addition to Tracy and Ulmar that are included are Dublin (25 miles, 28 minutes) and Manteca (27 miles, 40 minutes). An estimated 40 percent of workers are estimated to come from Tracy, 30 percent from Ulmar, 15 percent from Dublin, and 15 percent from Manteca). Workers would reach the site using existing roads, accessing the Project site from Interstate 580 to Patterson Pass Road and Midway Road. The majority of the truck deliveries would be for the energy storage enclosures and power conversion system installation, as well as any aggregate material that may be required for foundations. Construction would occur primarily during daylight hours. Vehicle use of area roadways resulting from Project construction activities would be limited to the 15-month construction period, as workers and materials are transported to and from the Project site. Construction workers would be encouraged to carpool in order to minimize vehicle trips. Construction is anticipated to commence as early as 2024 and would occur over the course of 15 months. Construction scenario assumptions, including phasing, equipment, and vehicle trips, were based on information provided by the applicant. The CaIEEMod model divides the construction processes into phases, which can be modified to fit Project specifications. As a conservative analysis, construction was assumed to begin at the start of 2024, though it is likely to commence later in the year. By assuming all major construction activity occurs in 2024, annual emissions would be higher than if emissions were divided between two construction years. As shown in Table 5, the second stage would overlap with both the third and fourth stages(the third and fourth stages would not occur simultaneously),with energy storage enclosures and substation installation occurring during weeks 17 through 52, gen-tie line foundation and tower erection occurring during weeks 41 through 46, and gen-tie line installation, pulling, and stringing occurring during weeks 47 through 52, and the CaIEEMod model reflects this concurrent schedule. It was also assumed that construction equipment would operate for 5 days per week during Project construction. OTETRA TECH 20 July 2023