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4 Environmental Analysis
<br /> 4.3 Air Quality
<br /> The onsite construction workforce would consist of laborers, craftspeople, supervisory personnel,
<br /> and support personnel. The onsite assembly and construction workforce is expected to reach a
<br /> peak of approximately 60 workers; the average number of workers onsite is anticipated to be
<br /> between 10 and 60 workers, depending on the construction phase. On average, it is anticipated
<br /> that each worker will generate one round trip to the Project per workday. Workers could reside in
<br /> any number of local communities or hotels. Due to the proximity of the city of Tracy and good
<br /> availability of hotels and lodging there, it is likely many workers will stay there. The other closest
<br /> residential locations to the Project are the hotels in Ulmar, Livermore, and Pleasanton. Additional
<br /> nearby communities include Verona, Asco, Dublin, Lathrop, and Manteca. The nearest large
<br /> urban areas are Tracy (9 miles, 18 minutes) and Ulmar(12 miles, 18 minutes). Because both are
<br /> close, both will be included in analysis as possible commuting locations. Because so many local
<br /> communities exist, the analysis did not consider all possible locations. It has been simplified to be
<br /> representative and conservative. The communities in addition to Tracy and Ulmar that are
<br /> included are Dublin (25 miles, 28 minutes) and Manteca (27 miles, 40 minutes). An estimated 40
<br /> percent of workers are estimated to come from Tracy, 30 percent from Ulmar, 15 percent from
<br /> Dublin, and 15 percent from Manteca). Workers would reach the site using existing roads,
<br /> accessing the Project site from 1-580 to Patterson Pass Road and Midway Road. Most truck
<br /> deliveries would be for the energy storage enclosures and power conversion system installation,
<br /> as well as any aggregate material that may be required for foundations. Construction would occur
<br /> primarily during daylight hours.
<br /> Construction is anticipated to commence as early as 2024 and would last approximately 15
<br /> months. As a conservative analysis, construction was assumed to begin at the start of 2024,
<br /> though it is likely to commence later in the year. By assuming all major construction activity occurs
<br /> in 2024, higher emission factors are applied in comparison to activities in 2025. As shown in Table
<br /> 4.3-4, the second, third, and fourth stages run concurrently, with energy storage enclosures and
<br /> substation installation occurring during weeks 17 through 52, gen-tie line foundation and tower
<br /> erection occurring during weeks 41 through 46, and gen-tie line installation, pulling, and stringing
<br /> occurring during weeks 47 through 52; the CaIEEMod model reflects this concurrent schedule.
<br /> It was also assumed that construction equipment would operate for 5 days per week during
<br /> Project construction. Project construction would result in exhaust emissions (from fuel combustion
<br /> in off-road construction equipment, generators, and vehicles) and fugitive dust emissions (from
<br /> earth-moving activities and vehicle travel on paved and unpaved roads). Construction emissions
<br /> were estimated using CaIEEMod Version 2020.4.0 (CAPCOA 2021). Construction emissions
<br /> modeled include those from the following sources:
<br /> oo Exhaust emissions of ROG, NOx, CO, SO2, PM10, PM2.5, and GHGs from off-road
<br /> construction equipment and stationary generators;
<br /> oo Exhaust emissions of ROG, NOx, CO, SO2, PM1o, and PM2.5 from on-road vehicle trips,
<br /> including worker commutes, vendor trips, and haul truck trips; and
<br /> oo Fugitive dust emissions of PM10 and PM2.5 from onsite earth-moving activities and offsite
<br /> vehicle travel.
<br /> Project-specific information on the construction schedule, equipment types, and daily usage rates
<br /> for each activity during the Project construction was used in the CaIEEMod modeling based on
<br /> Griffith Energy Storage Project 4.3-17 Tetra Tech/SCH 2022120675
<br /> Draft Environmental Impact Report August 2023
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