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Administrative Draft Environmental Impact Report Gill Medical Center Project of construction. Further, Mitigation Measure 4.5-2a would reduce annual PM,o emissions by more than 60 percent during Phase 1 of construction and 50 percent during Phase 2 of construction.These reduction values are beyond the reduction needed to achieve the SJVAPCD Rule 9510 target. Table 4.5-5.Construction Related NOx and PM10 Emissions-Baseline and Mitigated(tons per Phase) Construction Year NOx Baseline NOx Mitigated Percent Reduction Phase 1 Construction(2023) 6.3 0.7 72.69% Phase 2 Construction(2029-2030) 8.7 4.1 52.87% SJVAPCD Potentially Significant Impact Threshold 20% Construction Year PM10 Baseline PM10 Mitigated Percent Reduction Phase 1 Construction(2023) 1.3 0.5 61.53% Phase 2 Construction(2029-2030) 2.6 1.3 50.00% SJVAPCD Potentially Significant Impact Threshold 45% Source: CalEEMod version 2013.2.2.See Appendix D for emission outputs. Notes: Mitigated emissions account for the use of equipment with CARB Tier 4 Certified engines.Emission reduction/credits for construction emissions are also applied based on the required implementation of SJVAPCD Regulation VIII. The specific regulation applied in CalEEMod are watering unpaved surfaces and areas,use of nontoxic chemical or organic dust suppressants on unpaved roads and traffic areas,limiting vehicle speed on unpaved roads and traffic areas to a maximum 15 miles per hour,and the prevention of trackout through installation of a trackout control device. Percent reduction calculated using((baseline-mitigated)/baseline)=percent reduction As previously stated, construction-generated emissions would not exceed SJVAPCD significance thresholds. However,the Project proposes the construction of a medical center over 20,000 square feet, instigating the implementation of Rule 9510. Rule 9510 requires a project to reduce NOx emissions from the Project's baseline emissions by 20 percent and reduce annual PM10 emissions by 45 percent. Mitigation Measure 4.5-2a would result in a greater than required reduction in NOx and PM10 emissions from baseline for all construction activities. Therefore, with implementation of Mitigation Measure 4.5-2a, the Proposed Project would not exceed SJVAPCD thresholds for NOx and PM10, and construction generated emissions would be less than significant with mitigation incorporated. Operational Air Pollutant Emissions By its very nature, air pollution is largely a cumulative impact. No single project is sufficient in size, by itself, to result in nonattainment of ambient air quality standards. Instead, a project's individual emissions contribute to existing cumulatively significant adverse air quality impacts. If a project's individual emissions exceed its identified significance thresholds, the project would be cumulatively considerable. Projects that do not exceed significance thresholds would not be considered cumulative considerable. Implementation of the Project would result in long-term operational emissions of criteria air pollutants such as PM1o, PM2.5, CO, and SO2 as well as 03 precursors such as ROG and NOx. Project-generated Air Quality 4.5-17 October 2021