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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project The Project would comply with SJVAPCD Rule 8021 to control dust emissions generated during grading activities. Standard construction practices that would be employed to reduce fugitive dust emissions include: 00 Develop a dust control plan to outline how the Project will comply with Rule 8021 and minimize fugitive dust during construction, 30 Land clearing, grubbing, scraping, excavation, land leveling, grading, cut and fill, and demolition activities shall be effectively controlled utilizing application of water or by presoaking, 30 Minimize and cleanup trackout onto paved roads, 00 Cover haul trucks, 00 Rapid cleanup of Project-related trackout or spills on paved roads, 00 Minimize grading and soil movement when winds exceed 30 miles per hour, and 00 Implement a speed limit of 15 miles per hour during all construction phases for vehicles travelling on un-paved roads. The Project would also use of Tier 4 engines for construction equipment to reduce NOx and DPM emissions and meet the requirements of Rule 9510. In addition to dust control measures, the use of Tier 4 engines was incorporated to CalEEMod. For the purpose of this assessment, it was assumed that all off-road diesel equipment greater than 85 horsepower would meet EPA Tier 4 off-road emission standards or equivalent. Project construction emissions were calculated using the CalEEMod. Table 8 presents the estimated maximum annual emissions generated during construction of the Project. As previously stated, the BAAQMD annual significance threshold for PM2.5 was used instead of the SJVAPCD threshold as the BAAQD annual PM2.5 threshold is more conservative. Table 9 presents the estimated on-site maximum daily emissions generated during construction of the Project. Emissions with and without Rule 9510 and dust control reductions are presented. Detailed emission calculations are provided in Appendix A. The SJVAPCD has determined that projects with emissions below the thresholds of significance for criteria pollutants would not conflict or obstruct implementation of the SJVAPCD's air quality plan (SJVAPCD 2015a). Table 8. Estimated Maximum Annual Construction Criteria Air Pollutant Emissions Emissions(tons) Total Project Emissions ROG NOxCO sox PM10 No Reductions 1.09 9.35 10.98 0.03 1.25 0.72 Rule 9510 and Dust Control Reductions 1.09 5.22 10.98 0.03 0.76 0.41 SJVAPCD Threshold(tons/year) 10 10 100 27 15 10 Threshold Exceeded? No No No No No No Table 9. Estimated On-Site Maximum Daily Construction Criteria Air Pollutant Emissions Emissions (lbs/day) Total Project On-Site Emissions ROG NOx CO sox PM10 PM2.5 No Reductions 11.92 99.99 98.44 0.25 18.38 10.83 Rule 9510 and Dust Control Reductions 11.92 51.46 98.44 0.25 8.68 5.33 SJVAPCD On-site Emissions Threshold 100 100 100 100 100 100 Threshold Exceeded? No No No No No No OTETRA TECH 25 July 2023