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Greenhouse Gas Emissions Technical Report Mountain House Neighborhoods K&L, San,Joaquin County, California { For residential energy use Baseline GHG emissions, ENVIRON relied upon metrics developed by SJVAPCD.14 Specifically, ENVIRON used a baseline emission rate of 2.98 metric tonnes CO2e/year/DU (DU = dwelling unit) for electricity and 2.88 metric tonnes CO2elyear/DU for natural gas. For some other components of the inventory, for example the CaIEEMod input `operational year', ENVIRON chose 2005 as the closest year to the CARIB Baseline.15 ENVIRON used the California Emission Estimator Model (CalEEMod)is version 2011.1.1 to ! calculate Project and Baseline emissions, where Baseline emissions were not otherwise supplied by the SJVAPCD. CalEEMod calculates annual GHG emissions which can be used in support of analyses in environmental documents such as Environmental Impact Reports (EIR's) and Negative Declarations used to support a CEQA evaluation. CalEEMod utilizes widely accepted models for emission estimates combined with appropriate default data that can be used if site-specific information is not available. These models and default estimates use sources such as the United States Environmental Protection Agency (USEPA) AP-42 emission factors, California Air Resources Board (GARB) onroad and off road equipment emission models such as the EMission FACtor model (EMFAC) and the Off road Emissions Inventory Program r model (OFFROAD), and studies commissioned by California agencies such as the California Energy Commission (CEC).and Galrecycle. ENVIRON used San Joaquin County CalEEMod defaults in the model runs unless otherwise Ik noted in the methodology descriptions below. The CaIEEMod output files for Project and Baseline are provided for reference in Appendices A and B, respectively. For components of the inventory that are not included in CalEEMod (i.e., energy usage at recreational facilities such as swimming pools), ENVIRON estimated GHG emissions outside of CaIEEMod. These emissions were then combined with the components of the GHG inventory estimated using CaIEEMod. For the Project, ENVIRON incorporated additional GHG emissions reductions associated with' BPS, which are outlined in Section 3.5. 3.2 Impact of Regulatory Developments on the Project's GHG Inventory Promulgated regulations that will affect the Project's emissions are accounted for in this inventory. In particular, the Pavley Standards and the Renewable Portfolio Standards (RPS) will be in effect at the anticipated time of buildout of the Project, and therefore are accounted for in the Project emission calculations. This section provides an overview of the impact of these two rules (RPS and Pavley) on the Project's GHG inventory. 14"Draft Proposed Baseline GHG Emissions per Dwelling Unit—Residential (5/12/10)." Available online: hitp://www.valleyair.org/Programs/CCAP/bps/Residential_baseline_GHG_per_dwelling_unit_2010May12.pdf The emissions estimation model(CaIEEMod) used by ENVIRON has options to choose 2000 or 2005, but not years in between. Therefore, ENVIRON chose the closest year(2005),which is expected to be a conservative measure because it generally results in a smaller baseline emission estimate and therefore a lower percentage reduction in emissions. 16 Available at: http://www.caleemod.com/ 03-25858A 8 E N V I R N