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Traffic Impact Study Griffith Energy Storage Project 4.0 PROJECT IMPACTS 4.1 VEHICLE MILES TRAVELED 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 analysis 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= 2 times per day). The distances were estimated as follows: • The site is located within 20 miles of several communities and towns. The nearby communities include Tracy, Dublin, Ulmar, Livermore, Verona, Asco, Lathrop, and Manteca. The nearest large communities include Trace and Ulmar. The closest possible housing to the site are hotels located in Tracy and Ulmar, with additional lodging available in the other communities listed previously. In an effort to conservatively estimate where workers would come from, 40% of workers were assumed to come from Tracy, 30% from Ulmar, 15% from Dublin, and 15% from Manteca. • Battery equipment is assumed to be 100% sourced from the Port of Oakland as a conservative estimate of the distance battery equipment may have to travel to reach the Project site. • For construction materials that can be locally sourced, 50% are assumed to be sourced from Oakland and 50% from Stockton. Table 2 provides the results of the VMT analysis. The significance of the total VMT and impact implications are discussed in Section 4.1.1. The full analysis with week by week VMT is shown in Appendix B. Table 2. Construction Vehicle Miles Traveled OccurrencesSource Location Distance . er week* Totals 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 30.4 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. 4.1.1 Operations VMT Operational VMT is considerably smaller than the construction VMT. As mentioned previously, on a typical day, no worker would be visiting the site. A conservative estimate of the VMT for operations would assume 2 workers from the city of Oakland every week, a maximum of 4,857 VMT per year during operations. This rate would be typical throughout the operational life of the facility. There would likely be occasional larger repair operations, but these would be infrequent and of short duration. Given the short duration and infrequency of the repairs, these occurrences would add so few VMT that it is not a meaningful inclusion in the analysis. Over the next 20-years, the total VMT for operations is likely less than 97,136 miles. NTETRA TECH 9 February 2023