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f ,Greenhouse Gas Emissions Technical Report Mountain House Neighborhoods K&L,San Joaquin County,California Executive Summary I Mountain House is a mixed-use development in San Joaquin County, California. The focus of ; t 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. Because the San Joaquin Valley Air Pollution Control District (SJVAPCD, the District) is the primary agency responsible for comprehensive air pollution control in the San Joaquin Valley, where'this Project will be located, this report follows SJVAPCD GHG emissions calculation guidance.. The Project inventory:considers eight categories of GHG emissions: energy use associated with } residential buildings and non.residential buildings, mobile sources, area sources, solid waste, water and waste water, swimming pools at recreational facilities, and vegetation. The electrical `I power for the Project.will be supplied by Modesto Irrigation District (MID), Accordingly, indirect GHG emissions from electricity usage associated with the Project are calculated using the MID carbon-intensity factors adjusted for future mandated renewable energy requirements. Natural gas will be supplied by Pacific Gas and Electric (PG&E). To assist interested parties in assessing the significance of GHG emissions from land-use development projects under the California Environmental Quality Act (CEQA), SJVAPCD has developed guidance." SJVAPCD guidance relies on the use of performance based standards, . otherwise known as Best Performance Standards (BPS), for assessing the significance of GHG t emissions under CEQA. According to SJVAPCD guidance, projects implementing BPS would t be determined to have a less than significant individual and cumulative impact on global climate change and would not require:project specific quantification of GHG emissions. However, projects not implementing BPS are required to demonstrate a 29% reduction in GHG emissions, compared to business-as-usual, to have a less than significant impact.3 The 29% reduction f-, target is consistent with GHG emission reduction targets established in the California Air 4,5 l Resources Board's (CARE) AB 32 Scoping Plan. "Guidance for Valley Land-use Agencies in Addressing GHG Emission Impacts for New Projects under CEQA." Available at:http://www.valleyair.org/ProgramslCCAP/12-17-0913%20CCAP%20- %20FINAL%20LU%20G u idance%20-%20 Dec%2017%202009.pdf 2"Final Staff Report—Addressing Greenhouse Gas Emissions Impacts under the California Environmental Quality Act." Available at: http://www.valleyair.org/ProgramslCCAP/12-17-09/1%20CCAP%20- %20FINAL%20C EQA%20G HG%20Staff%2O Repo rt%20-%20 Dec%2017%202009.pdf ri s The SJVAPCD documents define business-as-usual as the total baseline emission for all emissions sources within the development type, projected for the year 2020, assuming no change in GHG emissions per unit of activity as established for the baseline period,2002-2004. Based on conversations with SJVAPCD, ENVIRON understands that emissions reduction percentages associated with BPS can be applied to an emission inventory that has been independently calculated. a Page 7 of"SJVAPCD Final Staff Report Addressing Greenhouse Gas Emissions Impacts under the California i Environmental Quality Act." Available at: http://www.valleyair.org/ProgramslCCAP/12-17-09/1%20CCAP%20- F %20FINAL%24CEQA%20GHG%20Staff%20Report%20-%20Dec%2017%202009.pdf 5 Climate Change Scoping Plan. CARE. December 2008. Available at: http://www.arb.ca.gov/cc/scopingplan/document/scapingplandocument.htm R 03-25EwA 1 E N V IR O N