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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project 5. Would the project violate any air quality standard or contribute substantially to an existing or projected air quality violation? Criteria Pollutants The Guidance for Assessing and Mitigating Air Quality Impacts has established emissions-based thresholds of significance for criteria pollutants (SJVAPCD 2015a), which are shown in Table 4. The SJVAPCD has established significance thresholds for construction emissions and operational permitted and non-permitted equipment and activities, and it recommends evaluating impact significance for these categories separately. These thresholds of significance are based on a calendar-year basis, although construction emissions are assessed on a rolling 12-month period. A segment of the gen-tie line (less than 0.25 miles) is located in Alameda County. This segment of the gen-tie line will also be compared to the SJVAPCD's significance thresholds as these are more stringent than the BAAQMD's significance thresholds, with the exception of PM2.5. The BAAQMD construction significance threshold of 10 tons per year will be used for PM2.5. Table 4. SJVAPCD Air Quality Thresholds of Significance— Criteria Pollutants Operational Construction Emissions Permitted Equipment and Non-Permitted Equipm)enl ri Pollutant (tons per year) Activities and Activities ROG 10 10 10 NOx 10 10 10 CO 100 100 100 Sox 27 27 27 PM10 15 15 15 PM2.51 10 10 10 Source:SJVAPCD 2015a '(BAAQMD 2017) In addition to the annual emissions mass thresholds described in Table 4, the SJVAPCD has also established screening criteria to determine whether a project would result in a CO hotspot at affected roadway intersections (SJVAPCD 2015a). If neither of the following criteria are met at any of the intersections affected by the project, the project would result in no potential to create a violation of the CO standard: oo A traffic study for the project indicates that the level of service (LOS) on one or more streets or at one or more intersections in the project vicinity will be reduced to LOS E or F. oo A traffic study indicates that the project will substantially worsen an already existing LOS F on one or more streets or at more intersections in the project vicinity. An LOS E Roadway is characterized by unstable traffic flow at or near capacity levels with poor levels of comfort and convenience. An LOS F Roadway is characterized by forced traffic flow in which the amount of traffic approaching a point exceeds the amount that can be served. LOS F is characterized by stop- and-go waves, poor travel times, low comfort and convenience, and increased accident exposure. The Project is located in a sparsely populated area and is unlikely to result in challenges to traffic flow. Ambient Air Quality Analysis The SJVAPCD recommends that an Ambient Air Quality Analysis (AAAA) be performed when on-site emissions of any criteria pollutant would equal or exceed 100 pounds per day (lbs/day). If emissions of one criteria pollutant exceeds the threshold, then all criteria pollutants are to be modeled. In the AAAA, air pollutant concentrations are determined by conducting air dispersion modeling, adding the resulting OTETRA TECH 18 July 2023