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Administrative Draft Environmental Impact Report Gill Medical Center Project using CalEEMod (CAPCOA 2017). CalEEMod is a statewide land use emissions computer model designed to quantify potential GHG emissions associated with both construction and operations from a variety of land use projects. Operational mobile source GHG emissions are calculated with EMFAC 2017. EMFAC 2017 is a mathematical model that was developed to calculate emission rates from motor vehicles that operate on highways, freeways, and local roads in California and is commonly used by CARB to estimate changes in future emissions from on-road mobile sources. As previously described, Phase 1 construction is anticipated to begin in late 2021 and take approximately 12 months to complete. The Phase 1 Medical Center Building is expected to begin operations in 2023. Phase 2 construction is scheduled to begin in 2029 and take approximately 20 months to complete. The Phase 2 Hospital and other support uses are expected to begin operation in 2031. Project construction- generated GHG emissions were calculated based on this timeline and the expected construction equipment provided by the Project applicant and identified in Section 3.0, Project Description. Operational GHG emissions are based on the Project site plans and the estimated traffic trip generation rates and Project fleet mix from KD Anderson and Associates (2020). Helicopter-generated GHG emissions are calculated based on the emission factors identified for a UH-1 N with two T400-CP-400 engines contained in the Air Force 2020 Mobile Emissions Calculations Guide (Air Force Civil Engineer Center 2020).The UH-1 N was chosen to represent a "worst-case" scenario per its similarity to the Airbus H145 which is the largest aircraft anticipated for transport to the Project site. In contrast to helicopter related criteria pollutant emissions, GHG emissions are calculated for the duration of the flight. Per analysis conducted for heliport design and operations (Heliplanners 2021), one flight per week with a 3.5-hour duration were assumed to estimate GHG emissions.As with criteria pollutants, GHG emissions from each flight were calculated for a standard landing and takeoff cycle. See Draft EIR Appendix D for GHG emissions modeling details. 4.10.3.3 Project Emissions In view of the above considerations in Sections 4.10.3.1 and 4.10.3.2, this assessment quantifies the Project's total annual GHG emissions. Construction Construction-related activities that would generate GHG emissions include worker commute trips, haul trucks carrying supplies and materials to and from the Project site, and off-road construction equipment (e.g., dozers, loaders, excavators).Table 4.10-2 illustrates the specific construction generated GHG emissions that would result from construction of the Project. Greenhouse Gas and Climate Change 4.10-10 October 2021