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Greenhouse Gas Emissions Technical Report Mountain House Neighborhoods K&L, San Joaquin County, California r For all CO2 emissions (running, startup, and idling), CalEEMod applies Pavley I emission reductions to LDA, LDT1, LDT2, and MDV for each vehicle model year,and sums them to ar�ive at the total CO2 emissions for each scenario year. CalEEMod further applies LCFS reductions to CO2 emission factors after adjustments from Pavley I for scenario years 2011 and after.22 C� 3.3 Operational Emissions Emissions from mobile and area sources and indirect emissions from energy use would occur every year after buildout. This section outlines the operational GHG emissions. There are no anticipated stationary sources at the Project, i.e., those with an identified emission point such!ias a stack, which would require an operational permit from SJVAPCD. 3.3.1 Mobile Source Emissions This section addresses GHG emissions from mobile sources associated with the Project. The mobile source emissions considered for this Project will be from the typical daily operation of motor vehicles by residents and visitors. Since SJVAPCD's baseline GHG emission metrics only include energy usage and do not include emissions associated with traffic, ENVIRON estimated both Baseline and Project traffic emissions using CalEEMod land-use inputs as shown in Table 2 and trip information as shown in Appendices A and B Section 4 and explained below. ENVIRON used Project-specific land-uses as inputs to CalEEMod. CalEEMod uses these inputs to calculate the vehicle miles traveled (VMT) and the associated GHG emissions. ENVIRON used urban trip lengths in the model, as the development will be located near an urban area (i.e., Tracy). For mobile sources, all CaIEEMod inputs were the same for the Project and the Baseline runs, except for the year of operation. The Baseline run used an operational year of 2005 and the Project run used an operational year of 2020. This change adjusts the fleet mix and fleet emission factor as described above in the vehicle emissions standards section. The resultant Project and Baseline mobile source GHG emissions are shown in Table 1 with supporting information provided in Appendices A and B, Section 4. 3.3.2 Buildings Energy Use GHGs are emitted as a result of activities in buildings for which electricity and natural gas are lI used as energy sources. Combustion of any type of fuel emits CO2 and other GHGs directly into the atmosphere; when this occurs in a building, this is a direct emission source associated with that building. GHGs are also emitted during the generation of electricity from fossil fuels. As discussed earlier, Table 3 lists the emission factors for electricity used in this analysis. The emission factor for natural gas is a CalEEIVIod default that is based on California Climate Action Registry (CCAR) emission factors (see Table 4), The land-use types used with CalEEMod are the same as for the mobile source emissions above (see Table 2). Both Project and Baseline{ 22 Adapted from page 14 of the CalEEMod User's Guide,Appendix A. "Calculation Details". Available at: www.caleemod.com 03-25858A 10 E N V I R 0. N