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1 Greenhouse Gas Emissions Technical Report Mountain House Neighborhoods K&L,San Joaquin County,California calculation methodologies are described below. Unless otherwise noted, CaIEEMod default parameters were used. For both residential and non-residential land-uses, climate zone 2 was selected based on the CaIEEMod forecast climate zone map. 3:3.2.1 Residential Buildings Energy Use i To estimate residential building energy GHG emissions for the Project, ENVIRON used the most recent Residential Appliance Saturation Study (RASS).23 Project emissions also reflect the developer's commitment to install EnergyStar appliances in residential dwelling units. Project emissions have been calculated using a MID emission factor that accounts for the 20% - RPS required by 2010, as discussed earlier. In contrast to the previous (2004) RASS survey, which did not include energy usage associated with natural gas fireplaces, the most recent F (2009) BASS survey used in this analysis includes energy usage associated with natural gas fireplaces. In an effort to avoid double counting, since fireplaces are.commonly associated with area sources", ENVIRON set hearth-related area source emissions in CalEEMod to zero. To calculate the residential energy input parameters shown in Table 5 (e.g., Title 24 electricity, t non-Title 24 natural gas), ENVIRON calculated energy use outside of CalEEMod using the same methodology as currently employed by CaIEEMod and explained in CaIEEMod Appendix E,24 but relied upon the newer:RASS data that has.not yet been incorporated into CalEEMod. The new BASS data are based on 2009 consumption data (as compared to CalEEMod that J__1 uses 2002 consumption data). Because older buildings tend to be less energy efficient, and the majority of the buildings in the survey were constructed before 2001, the RASS data likely overestimate energy use for.a 2001 Title 24-:compliant building. Therefore, to account for updates since the.2001 Title 24 standards, percentage reductions for each end use category taken directly from the CEC's "Impact Analysis for 2005 Energy Efficiency Standards"25 and "Impact Analysis 2008 Update to the California Energy Efficiency Standards for Residential and ` Nonresidential Buildings"26 reports were applied to the RASS dataset for improvements from 2001 to 2005, and 2005 to 2008, respectively. The resulting 2008 numbers were then used as Project energy intensities. Table 5 summarizes the CaIEEMod input parameters. As described earlier, ENVIRON estimated Baseline energy usage GHG emissions using draft �1 baseline metrics developed by SJVAPCD.27 For residential projects, SJVAPCD has developed '—` a baseline metric of 2.98 tonnes CO2e/yr/DU (DU=dwelling unit) for electricity and 2.88 tonnes CO2elyr/DU for natural gas. 23 All BASS data can be downloaded online: http://websafe.kemainc.com/rass2009/ 24 California Emissions Estimator Model (CaIEEMod) User's Guide,Appendix E. Available at: http://www.caleemod.com/ zs California Energy Commission.2003. Impact Analysis:2005 Update to the California Energy Efficiency Standards for Residential and Nonresidential Buildings. Available at: http://www.energy.ca.g ovltitle24/2005st6nd ards/archive/rulemaking/documents/2003-07-11_400-03-014.PDF 26 California Energy Commission.2007. Impact Analysis 2008 Update to the California Energy Efficiency Standards Ffor Residential and Nonresidential.Buildings. Available at: http://www.energy.ca.gov/title24/2008standards/rulemaking/documents/2007-11-07—IMPACT ANALYSIS.PDF 27 SJVAPCD. 2010. Draft Proposed Baseline GHG Emissions Per Dwelling Unit—Residential. May 12. Available at: http://www.valleyai r.org/Programs/CCAP/bps/Residential_baseline_GHG_per_dwelling—unit-201 OMayl 2.pdf 03-25858A 11 E N v IA 0 N