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4 Environmental Analysis 4.15 Transportation IMPACT 4.15-2: Would the project conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b)? (Less than Significant Impact) VMT The VMT analysis aims to quantify the total number of vehicle miles added to the roads as a direct result of the construction and operations of the Project. The Traffic Impact Report (2023) looked at the estimated number of workers expected on site for each construction phase and multiplied that by the approximate distance traveled and the number of times per week that distance is traversed (i.e., commutes happen 10 times per week, which equals 2 times per day). Employees during the construction phase are anticipated to commute from communities and towns approximately 20 miles from the Project site. These nearby communities include Tracy, Dublin, Ulmar, Livermore, Verona, Asco, Lathrop, and Manteca. In the Traffic Impact Report (2023), it was assumed that 40 percent of workers are to come from Tracy, 30 percent from Ulmar, 15 percent from Dublin, and 15 percent from Manteca. 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 percent 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 percent from Oakland and 50 percent from Stockton. Table 4.15-1 provides the results of the VMT analysis. Table 4.15-1. Construction Vehicle Miles Traveled Distance Occurrences Source Location (miles) per Week* Total Worker Commute from/to Tracy 9.4 10 128,066 Worker Commute from/to Ulmar 11.3 10 115,463 Worker commute from/to Dublin 24.4 10 124,660 Worker Commute from/to Manteca 23.1 10 118,018 Battery Equipment Deliveries from the Port of Oakland 46.7 53 198,008 Materials Deliveries from Oakland 46.7 27 99,004 Materials Deliveries from Stockton 1 30.4 1 26 64,448 Total Passenger Vehicle VMT 486,207 Total Heavy Vehicle VMT 361,460 Grand Total Construction VMT 847,667 'Average over all stages. There is no established threshold of significance for VMT in San Joaquin County.Alameda County has a threshold of 110 daily vehicle trips for small projects (Association of Bay Area Governments 2023). The proposed Project would generate approximately 60 daily vehicle trips, significantly less than the threshold. Since no quantitative, qualitative, or performance level is identified, the significance of 847,667 additional miles traveled must be evaluated based on the three guidance criteria from the CEQA Technical Advisory, including the project's reduction of GHG emissions, diversity of land use, and Griffith Energy Storage Project 4.15-15 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023