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4 Environmental Analysis 4.3 Air Quality 4.3.6 Impacts Analysis IMPACT 4.3-1: Would the project conflict with or obstruct implementation of the applicable air quality plan? (Less than Significant Impact) The Project would result 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 SJVAB is in nonattainment (03, PM1o, and PM2.5). The SJVAPCD has prepared several air quality attainment plans to achieve ozone and particulate matter standards. The SJVAPCD has determined that projects the generate emissions below the thresholds of significance for criteria pollutants would not conflict or obstruct implementation of the applicable SJVAPCD air quality plans (SJVAPCD 2015a). The Project would comply with applicable SJVAPCD rules and regulations, such as Regulation VIII (Fugitive PM10 Prohibitions) and IX (Mobile and Indirect Sources), which are discussed in detail in Appendix D (Air Quality and Greenhouse Gas Technical Report). Rule 9510 requires reductions in NOx and diesel particulate matter(as PM1o). In addition,the Project would not conflict with existing land uses or result in population growth. The Project would not result in a long-term increase in the number of trips or increase the overall vehicle miles traveled in the area. Worker vehicle trips, vendor trucks, and haul trucks would be generated during the proposed construction activities but would cease after construction is completed. NOx emissions during construction would not exceed the SJVAPCD significance threshold. Additionally, compliance with SJVAPCD Regulation VIII and Rule 9510 would further reduce the Project's less than significant NOx emissions. The purposes of Rule 9510 are to reduce emissions from NOx and PM10 that are associated with construction and operation of new development projects in the San Joaquin Valley. Specifically, Rule 9510 was promulgated to reduce the growth in NOx and PM10 emissions associated with the construction and operation of new development projects, including transportation and transit development projects in the San Joaquin Valley. The Rule 9510 for NOx and PM10 reduction requires at least 20 percent reduction of NOx construction emissions and 45 percent of construction diesel exhaust particulate matter (expressed as PM1o). The rule assures that the Project will not interfere with SJVAPCD attainment plans. Table 4.3-7 provides NOx and PM10 construction exhaust emissions with and without emissions reduction measures, and the percent reduction from the use of Tier 4 engines for equipment greater than 85 horsepower. Table 4.3-7. Rule 9510 NOx and PM10 Reductions NOx Diesel Exhaust PMio (tons per year) (tons per year) Exhaust Emissions 0 - 2025 2024 2025 No Reductions 9.06 1 0.29 1 0.38 1 0.01 Rule 9510 Reductions 5.13 0.09 0.21 0.003 Percent Reduction 43% 69% 45% 70% Griffith Energy Storage Project 4.3-24 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023