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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project As shown in Table 8, annual construction emissions would not exceed the SJVAPCD annual significance thresholds for any pollutants, both with and without reductions. As shown in Table 9, maximum daily on- site construction emissions would not exceed SJVAPCD's localized significance threshold of 100 lbs/day for ROG, NOx, CO, SOX, PM1o, or PM2.5 both with and without reductions. SJVAPCD recommends that an AAQA be conducted when on-site emissions from any criteria pollutant would equal or exceed applicable significance thresholds or when on-site emissions would equal or exceed 100 lbs/day for any pollutant. Therefore, an AAQA was not performed for the Project. Operational Emissions Less Than Significant Impact. Project operational emissions were estimated using CalEEMod to include area, mobile, and off-road source emissions. This included potential emissions from landscaping, worker commutes, and heavy trucks used during maintenance. Emissions from energy use were not included since electricity used on-site would be supplied from the on-site batteries. Table 10 presents the estimated maximum annual operational emissions in tons per year with a comparison to SJVAPCD thresholds. The PM2.5 significance threshold is based on the BAAQMD threshold of 10 tons per year. Detailed emissions calculations are provided in Appendix A. Table 10. Estimated Maximum Annual Operational Criteria Air Pollutant Emissions ROG NOx • sox PM10 Emission Source Emissions(tons per Mobile, and Offroad 0.006 0.03 0.04 0.0001 0.0020 0.0012 SJVAPCD Threshold 10 10 100 27 15 10 Threshold Exceeded? No No No No No No Table 11. Estimated Maximum Daily Operational Criteria Air Pollutant Emissions ROG NOx • sox PM10 Emission Source Emissions .. Area, Mobile, and Offroad 1.45 8.60 9.72 0.04 0.32 0.29 SJVAPCD Threshold 100 100 100 100 100 100 Threshold Exceeded? No No No No No No As shown in Tables 10 and 11, operational emissions would not exceed the SJVAPCD thresholds for ROG, NOx, CO, SOX, PM10 and PM2.5. Since operational activities would be minimal, including only routine inspection and maintenance, ambient air quality modeling was not required. Additionally, traffic associated with operations would be negligible and would not result in CO hotspots at intersections. Therefore, the operational impacts would be less than significant. 2.5.3 Would the project result in a cumulatively considerable net increase of any criteria pollutant for which the project region is in non-attainment under an applicable federal or state ambient air quality standard (including releasing emissions which exceed quantitative thresholds for 03 precursors)? Less Than Significant Impact. As discussed previously, the Project results in an increase in short-term emissions related to construction and an increase in long-term operational emissions for those pollutants and precursors (ROG and NOx)for which the SJVAPCD is in non-attainment(03, PM10 and PM2.5). Although the Project site is located in a region that is in non-attainment for Os, PM10 and PM2.5, the OTETRA TECH 26 July 2023