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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project Averaging Period 2019 2020 2021 Carbon Monoxide(CO)—Stockton-Hazelton Street, California Monitoring Station(AQS Site ID:06-077-1002) 1-hour Maximum Concentration (ppm) 3.1 2.8 2.2 Number of days exceeding CAAQS =20 ppm 0 0 -- Number of days exceeding NAAQS =35 ppm 0 0 0 8-hour Maximum Concentration -- -- -- Number of days exceeding CAAQS =9.0 ppm -- -- -- Number of days exceeding NAAQS =9.0 ppm -- -- -- Coarse Particulate Matter(PMio)— Tracy Airport(A), California Monitoring Station(AQS Site ID:06-077-3005) 24-hour Maximum Concentration (lag/m3) 247 229 -- Number of days exceeding CAAQS =50 pg/m3 10 40 -- Number of days exceeding NAAQS = 150 pg/m3 1 2 -- Annual Average Concentration (state method)(lag/m3)(20 lag/m3) -- -- -- Fine Particulate Matter(PM2.e)— Tracy Airport(A)and(), California Monitoring Station(AQS Site ID:06-077- 3005)1 24-hour Maximum Concentration (lag/m3) 30.7 117.5 59.6 Number of days exceeding NAAQS =35 lag/m3 0 19 2 Annual Average Concentration (lag/m3)(12 lag/m3) 6.2 -- -- Sulfur Dioxide(SO2)—Fresno-Garland, California Monitoring Station(AQS Site ID:06-019-0011) 1-hour Maximum Concentration (ppm) 0.009 0.016 0.008 Number of days exceeding NAAQS =0.075 ppm 0 0 0 24-hour Maximum Concentration (ppm) 0.002 0.002 0.003 Number of days exceeding NAAQS =0.14 ppm 0 0 0 Annual Average Concentration (ppm)(0.03 ppm) -- -- -- Notes: 1—Data for 2019 and 2020 is from Tracy Airport(A)Monitor Station(AQS Site ID:06-077-3005).Data for 2021 was not available from this site.Data for 2021 is from Tracy Airport(-)Monitor Station,which is a preliminary site with not monitoring ID assigned. pg/m3—microgram per cubic meter;CAAQS—California ambient air quality standards;NAAQS—National ambient air quality standards;ppb—parts per billion;ppm—parts per million Sources:CARIB 2022a and CARIB 2022b 2.4 SIGNIFICANCE CRITERIA AND METHODOLOGY 2.4.1 Thresholds of Significance 2.4.1.1 California Environmental Quality Act Guidelines The State of California has developed guidelines to address the significance of air quality impacts based on Appendix G of the CEQA Guidelines, which indicates that a project has significant air quality impact if the following occurs: 1. Conflict with or obstruct implementation of the applicable air quality plan; 2. Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard; 3. Expose sensitive receptors to substantial pollutant concentrations; and 4. Result in other emissions (such as those leading to odors) adversely affecting a substantial number of people. 2.4,1,2 San Joaquin Valley Air Pollution Control District In addition to the air quality criteria above, SJVAPCD's Guidance for Assessing and Mitigating Air Quality includes one additional criterion as follows: OTETRA TECH 17 July 2023