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16558-03 AQ & GHG Assessment 4 Warner Avenue Footlab DEMOLITION ACTIVITIES Miscellaneous site demolition for the Project will include (i) future landscape, (ii) a small building, (iii) miscellaneous parking lot lights, and (iv) interior oifice space. The existing building and parking lot will remain intact. As a conservative estimate, this analysis assumes to up to 620 tons of debris1 will be generated from demolition activities. GRADING ACTIVITIES Dust is typically a major concern during grading activities. Because such emissions are not amenable to collection and discharge through a controlled source, they are called “fugitive emissions.” Fugitive dust emissions rates vary as a function of many parameters (soil silt, soil moisture, wind speed, area disturbed, number of vehicles, depth of disturbance or excavation, etc.). CalEEMod was utilized to calculate fugitive dust emissions resulting from this phase of activity. This analysis assumes that earthwork activities are expected to balance on site and no import or export of soils would be required. CONSTRUCTION DURATION For purposes of analysis, construction of Project is expected to commence in September 2025 and would last through February 2026. The construction schedule utilized in the analysis represents a “worst-case” analysis scenario should construction occur any time after the respective dates since emission factors for construction decrease as time passes and the analysis year increases due to emission regulations becoming more stringent2. The duration of construction activity and associated equipment represents a reasonable approximation of the expected construction fleet as required per CEQA Guidelines (16). TABLE 2: CONSTRUCTION DURATION Construction Activity Start Date End Date Days Demolition 9/1/2025 9/29/2025 20 Site Preparation 9/30/2025 10/14/2025 10 Site & Tenant Improvements 10/15/2025 2/3/2026 80 Landscape Median, Misc. Hardscape, & Access Ramp 1/7/2026 2/3/2026 20 Architectural Coating 1/7/2026 2/3/2026 20 1 This amount is a conservative estimate that accounts for future landscape, a small exterior building, miscellaneous parking lot lights, and interior oifice space. Demolition quantities for the project were calculated consistent with CalEEMod's calculation procedures, with tonnage determined by converting building square footage and asphalt/concrete area based on the tonnage- to-floor space ratio from a 1976 analysis by Murphy and Chatterjee. 2 As shown in the CalEEMod User’s Guide Version 2022, Appendix G “Table G-11. Statewide Average Annual Offroad Equipment Emission Factors” as the analysis year increases, emission factors for the same equipment pieces decrease due to the natural turnover of older equipment being replaced by newer less polluting equipment and new regulatory requirements.