Item 28 - Public Hearing - ZOA No. 20204-01 South Coast Technology Center

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South Coast Technology Center Project CEQA Exemption 15183 The Project's GHG emissions are compared to the current GHG emissions from the existing buildings. Table 4.8-3, Net Change In Greenhouse Gas Emissions, presents the estimated net change in GHG emissions from the proposed Project compared to the existing conditions. Table 4.8-3 Net Change in Greenhouse Gas Emissions Source Metric TonsNear Total Existing Emissions' 2,712.16 MTCO2e Total Project -Related Emissions2 6,894.55 MTCO2e Net Change in Emissions3 4,182.39 MTCO2e per year Notes: 1. Based on numbers presented in Table 4.8-1, Existing Greenhouse Gas Emissions. 2. Based on numbers presented in Table 4.8-2, Proiect's Greenhouse Gas Emissions. 3. To determine the net emissions resulting from the proposed Project, emissions from the existing conditions was deducted from emissions from the proposed Project (which includes construction emissions as shown in Table 4.8-2). Source: Refer to Appendix A of Attachment F, Greenhouse Gas Emissions Assessment, for assumptions used in this analysis Direct Project -Related Sources of Greenhouse Gases Construction Emissions. The proposed Project would result in a total of 1,003 MTCO2e of emissions during construction. The analysis considers the net change in GHG emissions (proposed Project minus existing conditions). However, the existing conditions does not include any construction activities. Construction GHG emissions are amortized over 30 years (i.e., total construction emissions divided by the lifetime of the Project, assumed to be 30 years), then added to the operational emissions, as recommended by SCAQMD.21 The amortization takes into consideration the temporary nature of construction activities. As shown in Table 4.8-2, construction of the proposed Project would generate approximately 33.43 MTCO2e of emissions per year when amortized over 30 years. Mobile Source. Based on the Attachment K, Trip Generation Assessment, the Project would result in a net decrease of 386 gross daily trips compared to existing conditions. The existing buildings currently generate approximately 1,423 MTCO2e of mobile source emissions per year while the proposed Project would generate approximately 5,223 MTCO2e of mobile source emissions per year; refer to Table 4.8-1 and Table 4.8-2. Additionally, as a conservative analysis, daily trips on weekends were assumed to be zero under the existing conditions, as the existing uses on -site are commercial offices and are assumed not to operate on weekends. As such, the net increase in GHG emissions from mobile emissions would be approximately 3,800 MTCO2e of emissions per year. Area Source. Area source emissions would be generated due to an increased demand for consumer products, architectural coating, and landscaping associated with the development of the proposed Project. The existing buildings currently generate approximately 6.79 MTCO2e of area source emissions per year while the proposed Project would generate approximately 6.62 MTCO2e of area source emissions per year; refer to Table 4.8-1 and Table 4.8-2. As such, the net change in GHG emissions from area sources would result in a net decrease of 0.17 MTCO2e of emissions per year (i.e., the proposed Project would result in less area source emissions than the existing conditions). 21 The Project lifetime is based on the standard 30-year assumption of the South Coast Air Quality Management District (South Coast Air Quality Management District, Draft Guidance Document— Interim CEQA Greenhouse Gas (GHG) Significance Threshold, October 2008). July 2024 Page 54