14 ATTACHMENT 6 - Appendix A - E

Summary of 2018 Spotorno Ranch Air Quality Analysis March 22, 2021 Page 13 assumed to begin in October 2018 and be completed by December 2020. If the construction schedule moves to later years, construction emissions would decrease compared with the emissions generated during the anticipated schedule because of future improvements in technology and compliance with ongoing stringent regulatory requirements; therefore, the construction schedule used in this analysis represents a “worst-case” analysis scenario. In order to account for the construction emissions in assessing the project ’s GHG impacts, the total emissions generated during construction were amortized based on the life of the development (residential—50 years) and added to the operational emissions. As shown in Table 7, construction of the project is estimated to generate approximately 1,011 MT CO2e. The amortized emissions from construction of 20.2 MT CO2e were added to the operational emissions to determine the total emissions of the project. These total project emissions were compared to the applicable BAAQMD significance threshold standard of 1,100 MT CO2e per year. Table 7: Unmitigated Construction Greenhouse Gas Emissions Construction Phases Total Emissions (MT CO2e/year) 2018 Site Preparation 36.4 Grading 131.8 Building Construction (2018) 1.9 Total 2018 Construction Emissions 170.1 2019 Building Construction (2019) 477.2 Total 2019 Construction Emissions 477.2 2020 Building Construction (2020) 320.3 Paving 37.2 Architectural Coating 6.3 Total 2020 Construction Emissions 363.8 Total Construction Emissions 1,011.1 Construction Emissions Amortized Over the Life of the Project (50 years) 20.2 Note: Calculations use unrounded numbers. Source: CalEEMod Operation Operational or long-term emissions occur over the life of the project. Sources for operational emissions include: