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City of Pleasanton—Hidden Canyon Residences and Preserve Greenhouse Gas Emissions Draft EIR 3.7-8 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 development and linear projects in California. It utilizes widely accepted methodologies for estimating emissions combined with default data that can be used when site-specific information is not available. Sources of these methodologies and default data include the EPA’s AP-42 emission factors, ARB’s vehicle emission models (such as EMFAC), and studies commissioned by California agencies such as the CEC. In addition, some local air districts provided customized information to support defaults and calculations for projects located in their jurisdictions. Construction and operational emissions reported in this analysis were modeled using CalEEMod Version 2022.1. Greenhouse Gases Assessed This analysis is restricted to GHGs identified by AB 32, which include CO, CH4, N2O, hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride. Total GHG emissions in this report are quantified and expressed as CO2e. Certain GHGs defined by AB 32 would not be emitted by the proposed project. Perfluorocarbons and sulfur hexafluoride are typically used in industrial applications, none of which would be used by the proposed project. Default Data and Assumptions The recommendations contained within the BAAQMD 2022 CEQA were used as a reference in preparation of the air quality analysis. CalEEMod provides default values for estimating construction and operational emissions from Bay Area specific projects. Although users may apply the default values, BAAQMD strongly recommends that default values be modified whenever project-specific information is available to obtain more accurate emissions quantification. When site-specific information is unavailable, BAAQMD recommends that the most conservative estimates be used for the type of construction equipment and number of pieces of equipment to be used, the hours of operation, and the distance to the nearest sensitive receptors. When changing any default parameters, users must include notes and references in the Justification for Changes box, which will facilitate reviews by lead agencies and other stakeholders. These Justification for Changes were documented when site-specific information was used instead of defaults. The CalEEMod report in Appendix B includes a listing of these changes and the notes include references to additional calculations and documentation which are also included in Appendix A following the CalEEMod Report. Model Inputs Quantifying air pollutant emissions associated with land development projects involves identifying all sources of relevant air pollutant emissions that could occur as a result of implementation of the proposed project and calculating criteria air pollutants by activity level and emission factor. Emission factors represent the emission rate of a pollutant over a given time or activity, for example, grams of nitrogen oxide (NOX) per vehicle mile traveled or grams of NOX per horsepower hour of equipment