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Greenhouse Gas Emissions Technical Report Gree P Mountain House Neighborhoods K&L, San Joaquin County, California 1 Introduction Mountain House is a mixed-use development in San Joaquin County, California. The focus of this analysis is the proposed development of select subdivisions (neighborhoods K & L, the Project) at Mountain House. The Project will result in both one-time.and annual greenhouse gas (GHG) emissions. This report provides an inventory of emissions that would result from approving the Project. GHGs are emitted directly due to the Project and include emissions F.' associated with the one-time land-use change. The Project entitlement will also result in indirect emissions associated with the Project, such as those associated with electricity use. This.report discusses the regulatory developments related to GHG emissions and provides an estimate of emissions that would result-from the Project. The estimated number and types of dwelling units and the sizes and types of non-residential Fill land-uses is shown in Table 2. Occupants of mixed-use developments use electricity, heat their buildings and water (typically with natural gas), and are commonly transported in motor vehicles, all of which directly or indirectly emit GHGs. The principal GHGs resulting from such activities are carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). CO2 is considered the most important GHG, due,primarily to the large quantity of emissions produced by fossil fuel combustion, especially during the generation of electricity and powering of motor vehicles. CH4 and .N20 are also emitted by fossil fuel combustion, though their emissions are much smaller than CO2. The effect that each of these gases can have on global warming is a combination of the mass of their emissions and their global warming potential (GWP). GWP indicates the predicted contribution of a gas to global warming relative to the predicted contribution by the same mass Of CO2. CH4 and N2O are substantially more potent GHGs than CO2. GHG emissions are typically reported in terms of tonnes (i.e., 1000's of kilograms) of CO2 equivalents (CO2e). CO2e are calculated as the product of the mass emitted of a given GHG and its specific GWP. While �. CH4 and N2O have much higher GWPs than CO2, CO2 is emitted in significantly higher quantities such that it accounts for the majority of GHG emissions in CO2e, both from mixed-use I developments and human activity in general. . r-; L, 5 P 03-25858A 5 E N V I R O N