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' BENDER READY -MIX CONCRETE MANUFACTURING PROJECT <br />Initial Study /Mitigated Negative Declaration <br />Project - Related Sources of Greenhouse Gases <br />i <br />w <br />I <br />11 <br />Direct project - related GHG emissions include emissions from construction activities, area sources, and <br />mobile sources. Table 4.7 -1, Estimated Greenhouse Gas Emissions, presents the estimated CO2, N20, <br />and CH4 emissions of the proposed project. GHG emissions from construction are typically amortized <br />over the lifetime of the project (30 years) and added to the operational emissions.4 As seen in Table <br />4.7 -1, the proposed project would result in a total of 7.25 MTCO2eq /yr from construction activities. <br />Following construction, no other GHG emissions would result with project implementation, as no new <br />vehicle trips would result and no new stationary sources are proposed. However, GHG emissions <br />associated with the existing facility operations have been quantified and are presented in Table 4.7 -1. <br />GHGs associated with area sources and mobile sources are 160.00 MTCO2eq /yr and 295.80 <br />MTCO2eq /yr, respectively. Total project- related direct operational emissions equate to 456.22 <br />MTCO2eq /yr. <br />Table 4.7 -1 <br />Estimated Greenhouse Gas Emissions <br />DIRECT EMISSIONS <br />Construction Emissions' <br />2011 <br />6.50 <br />0,00 <br />0.01 <br />0.00 <br />0.74 <br />7.25 <br />Total Amortized Construction Emissions <br />(30 years) <br />0.22 <br />0.00 <br />0.00 <br />0.00 <br />0.20 <br />0.42 <br />Area Source Emissions <br />160.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />160.00 <br />Mobile Source Emissions' <br />273.0 <br />0.07 <br />22.49 <br />0.01 <br />0.31 <br />295.80 <br />INDIRECT EMISSIONS <br />Electricity Consumption <br />8.85 <br />0.00 <br />0.03 <br />0.00 <br />0.01 <br />8.89 <br />Water Supply <br />0.36 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.36 <br />Total Project - Related GHG Emissions <br />465.47 MTCOseq/yr <br />GHG Threshold of Significance <br />1,100 MTCO:eq/yr <br />Significance of Impact <br />Less Than Significant <br />Notes: <br />1. Emissions calculated using CARB's Construction Equipment Emissions Table and the URBEMIS 2007 computer model. <br />2. CO2 Equivalent values calculated using the U.S. Environmental Protection Agency Website, Greenhouse <br />hftp:/hvww.e a.gov/cleanenergy/energy-resources/calculator.htrnl, accessed January 2011. <br />Gas Equivalencies <br />Cakulator, <br />Refer to Appendix A, Air QuaWIGreenhouse Gases Data, for detailed model in ut(out ut data. <br />Indirect Project - Related Sources of Greenhouse Gases <br />Electricity Consumption <br />Energy Consumption emissions were calculated using the South Coast Air Quality Management <br />District's (SCAQMD) CEQA Air Quality Handbook,5 the U.S. Energy Information Administration ,6 and <br />project - specific land use data. The emission factors for electricity use (771.62 pounds of CO2 per <br />megawatt hour [MWh], 0.00659 pounds of N20 per MWh, and 0.4037 pounds of CH4 per MWh) were <br />4 The project lifetime is based on the standard 30 year assumption of the South Coast Air Quality Management District <br />(http: /hvww.agmd.gov /hb /2008 /December /081231 a.htm). <br />5 SCAQMD's CEQA Air Quality Handbook, Table A9-11, November 1993. <br />6 U.S. Energy Information Administration, Domestic Electricity Emissions Factors 1999 -2002. <br />' JULY 2011 4,7 -3 GREENHOUSE GASES <br />31A-59 <br />