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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project Table 2. San Joaquin Valley (Kern County Portion) Attainment Status StandardsPollutant Designation/Classification Federal .. . Ozone(1-Hour) No federal standard Nonattainment/Severe Ozone(8-Hour) Nonattainment/Extreme Nonattainment NO2 Attainment/Unclassified Attainment CO Attainment/Unclassified Attainment/Unclassified PM10 Attainment Nonattainment PM2.5 Nonattainment Nonattainment SO2 Attainment/Unclassified Attainment Lead Attainment/Unclassified Attainment Hydrogen Sulfide No Federal Standard Unclassified Sulfates No Federal Standard Attainment Visibility Reducing Particles No Federal Standard Unclassified Vinyl Chloride No Federal Standard Attainment Sources:CARB 2021 2.3.2 Local Ambient Air Quality An extensive air monitoring network operated by SJVAPCD, CARB, and the U.S. National Park Service measure concentrations for major pollutants to determine attainment status as well as generate air quality forecasts. The closest monitor measuring ozone, NO2, PM10 and PM2.5 concentrations is the Tracey Airport monitoring station, located approximately 7 miles east of the Project area. For SO2, the closest monitor is the Fresno- Garland monitoring station located approximately 117 miles southeast of the Project area. Finally, for CO, the Stockton Hazleton Street monitoring station is the closest, located approximately 23 miles northeast of the proposed Project. For the purposes of this analysis, these monitoring locations were considered representative of the air quality experienced in the vicinity of the Project. Table 3 summarizes the most recent air quality data from 2019 through 2021 with the number of days exceeding the ambient air quality standards. Table 3. Local Ambient Air Quality Monitoring Data for the Years 2019-2021 Averaging Period 2019 2020 2021 Ozone(03)— Tracy—Airport(A), California Monitoring Station(AQS Site ID:06-077-3005) 1-hour Maximum Concentration (ppm) 0.095 0.086 0.089 Number of days exceeding CAAQS = 0.09 ppm 2 0 0 8-hour Maximum Concentration 0.079 0.078 0.077 Number of days exceeding CAAQS = 0.070 ppm 3 3 3 Number of days exceeding NAAQS =0.070 ppm 3 3 3 Nitrogen Dioxide(NO2)—Tracy-Airport(A), California Monitoring Station(AQS Site ID:06-077-3005) 1-hour Maximum Concentration (ppb) 37 37 36 Number of days exceeding CAAQS = 180 ppb 0 0 0 Number of days exceeding NAAQS = 100 ppb 0 0 0 Annual Average Concentration (ppm)(53 ppb) 4 4 - OTETRA TECH 16 July 2023