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City of Pleasanton—Hidden Canyon Residences and Preserve Greenhouse Gas Emissions Draft EIR 3.7-10 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-07 GHG.docx CalEEMod (off-model), accounting for the nature of each type of demolition and material density. It was then converted to tons and entered into CalEEMod this way. Details of these additional calculations are included along with the CalEEMod report in Appendix B. Site Preparation and Grading Hauling would be required to export material to/from the project site; according to applicant- provided information, the site will be balanced and will result in no additional daily haul trips during the site preparation phase. Building Construction During building construction activities, on-site emissions are primarily generated from the off-road construction equipment and are calculated using the equipment specified along with the ARB Off- Road Emission and Load Factors, the number of construction days and hours of operation per day. Off-Site Construction Vehicles A summary of the construction-related vehicle trips is shown in Appendix B. Note that the total number of construction vehicle trips would not necessarily occur on the same day because construction activities would vary each day during the construction period. Off-road emissions for demolition, site preparation, and grading phases are based on construction worker and haul trips both calculated internally in CalEEMod based on the number of pieces of off- road construction equipment for workers and the amount of demolition materials for hauling, assuming a 16 cubic yard capacity truck. Vendor trips may be optionally added for each phase as appropriate to the project and were added to the site preparation phase to account for the off haul of soil export and in the paving phase to account for delivery of asphalt and any aggregate base material needed for paving. Default hauling trips are 20 miles; Vendor trips are 8.4 miles and worker commute trip lengths are 11.7 miles based on the site location. Trips for building construction and architectural coating activities are based on the square footage of the buildings and the number of dwelling units for residential land uses. Mitigation Measures Emissions modeling was performed for an unmitigated scenario for this project. Operation To assess operational-related GHG emissions and their potential to cause a significant impact, the proposed project is analyzed for its consistency with the City’s CAP 2.0. This is discussed in greater detail in the analysis section below. 3.7.6 - Thresholds of Significance The BAAQMD’s 2022 CEQA Air Quality Guidelines provide recommended significance thresholds for GHGs for land use development projects and plans. The new thresholds state that, if a project would contribute its “fair share” of what will be required to achieve California’s long-term climate goal of carbon neutrality by 2045, then a reviewing agency can find that the impact will not be significant because the project will help to solve the problem of global climate change. The thresholds for new