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SAN LEANDRO SHORELINE DEVELOPMENT DRAFT EIR <br />CITY OF SAN LEANDRO <br />GREENHOUSE GAS EMISSIONS <br />4.6.1 IMPACT DISCUSSION <br />Methodology <br />GHG emissions from construction and operation of the Project were calculated using the California <br />Emissions Estimator Model (CalEEMod), Version 2013.2.2. Transportation emissions are based on trip <br />generation provided by Kittelson & Associates. Construction emissions are based on the construction <br />schedule provided by the City. <br />This section discusses the GHG emissions impacts of the Project. This discussion is organized by and <br />responds to each of the potential impacts identified in the thresholds of significance. <br />GHG-1 <br />Implementation of the Project could directly or indirectly generate GHG <br />emissions that may have a significant impact on the environment. <br />A project does not generate enough GHG emissions on its own to influence global climate change; <br />therefore, the GHG chapter measures a project's contribution to the cumulative environmental impact. <br />Development under the Project would contribute to global climate change through direct and indirect <br />emissions of GHG from transportation sources, energy (natural gas and purchased energy), water use and <br />wastewater generation, and solid waste generation. Construction emissions (total and amortized over a <br />30 -year duration)) are provided for informational purposes. The total and net increases in GHG emissions <br />associated with the Project are shown in Table 4.6-5. <br />BAAQMD does not have thresholds of significance for construction -related GHG emissions. GHG emissions <br />from construction activities are one-time, short-term emissions and therefore, would not significantly <br />contribute to long-term cumulative GHG emissions impacts of the Project. One-time, short -term <br />emissions are converted to average annual emissions by amortizing them over the service life of a <br />building. For buildings in general, it is reasonable to look at a 30 -year timeframe as this is a typical interval <br />before a new building requires the first major renovation .17 As shown in Table 4.6-5, when amortized over <br />an average 30 -year project lifetime, average annual construction emissions from the Project would <br />represent a nominal source of GHG emissions and would not exceed BAAQMD's de minimus bright line <br />threshold of 1,100 MTCO2e. Construction emissions are less than significant. <br />As shown in Table 4.6-5, the net increase GHG emissions generated by the operational phase of the <br />Project would exceed BAAQMD's bright -line significance criteria of 1,100 MTCO2e; and therefore, GHG <br />emissions impacts are evaluated based on the Project -efficiency. As identified in Table 4.6-5, the Project <br />would exceed the BAAQMD performance criteria of 4.6 MTCO2e/SP. Consequently, GHG emissions <br />impacts of the Project are significant. <br />37 International Energy Agency.2008, March. Energy Efficiency Requirements in Building Codes, Energy Efficiency Policies for <br />New Buildings. <br />4.6-18 DECEMBER 2014 <br />