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ra Greenhouse Gas Emissions Technical Report �¢ Mountain House Neighborhoods.K&L, San Joaquin County,California Fj i 3 GHG Emissions Inventory L This section describes the methodology that was used to develop the GHG emissions inventory ��.� associated with the Project. Because SJVAPCD is the primary agency responsible for comprehensive air pollution control in the San Joaquin Valley, this report follows SJVAPCD 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, and vegetation. The electrical power for the Project will be supplied by Modesto Irrigation District (MID). Accordingly, indirect GHG emissions from electricity usage 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). The GHG emissions inventory is summarized in Table 1. P, 3.1 Overall Calculation Methodology Consistent with the SJVAPCD guidelines discussed in the regulatory section above and with GHG emission reduction targets established in CARB's AB 32 Scoping Plan 12, ENVIRON quantified GHG emissions to show that the Project has reduced or mitigated GHG emissions by 29% compared to Baseline. This section further outlines these methodologies used to calculate the percent reduction. To calculate theP ercent reduction from the Baseline ENVIRON calculated emissions for a { Project scenario and a Baseline scenario and then calculated the percent difference between l $ the two. The year 2020 was chosen for the Project scenario to be consistent with the AB 32 l goal of achieving 1990 emission levels by 2020. These Project emissions are compared to emissions if the Project were constructed consistent with the assumptions in the CARB's E Scoping Plan ("Scoping Plan" projections for 2020 if 'no actions are taken' CARB 2020 NAT ! P� 9 { g ) p 1 ( ) !' compared to a baseline year between 2002 and 2004. E � To calculate emissions for the:Baseline scenario, ENVIRON used baseline metrics developed by SJVAPCD, when available. When baseline metrics were not available, ENVIRON developed ^ a baseline scenario based on assumptions consistent with SJVAPCD guidance. According to SJVAPCD guidance, the baseline is the average of 2002-2004: "The California Air Resources Board (CARB) used its emission inventory to establish the Baseline upon which changes in GHG emissions would be evaluated. The Baseline consists of a three-year average for GHG emissions occurring by sector during the baseline period of 2002-2004. The Baseline Period GHG emissions include emissions from all sources in CARB's emissions inventory, including both, old and new, large and small GHG emission sources"13 0l CI 1J 'Z Climate Change Scoping Pian. CARB. December 2008. Available at: http://www.arb.ca.gov/cc/scopingplan/document/scopingplandocument.htm as Page 28 of"SJVAPCD Final Staff Report Addressing Greenhouse Gas Emissions Impacts under the California Environmental Quality Act."Available at: http:/1www.valleyair.org/Programs/CCAP/12-17-0911%20CCAP%20- i %20 FI NAL%20C EQA%20G H G%20Staff%20Report%20-%20Dec%2017%202009:pdf I F 03-25858A 7 E N V I R 0 N