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Proposed Costco Wholesale Redwood City GDF Expansion 7.A. - Page 172 <br /> Air Quality/Climate Change Analysis <br /> Appendix A: Construction Emission Calculations <br /> Table A-2. Construction Emissions-Fugitive Dust Sources. <br /> Emission factor for grading: <br /> Variable Reference Symbol Value Unit <br /> PM�o particle size multiplier EPAAP-42 Table 11.9-1 k 0.6 -- EfP,� =kx0.O51x�S�20 <br /> �o <br /> PM2.5 particle size multiplier EPA AP-42 Table 11.9-1 k 0.031 -- <br /> Mean vehicle speed EPA AP-42 Table 11.9-1 S 7.1 miles/hr EfP�, =kx0.040x�S�z.S <br /> Grading PM�o: 1.543 IbNMT <br /> PM2.5: 0.167 IbNMT <br /> Source: U.S.Environmental Protection Agency, Compilation ofAir Pollutant Emission Factors (AP-42),Section 11.9 Western <br /> SurFace Coal Mining,Table 11.9-1. VMT is based on the analytical approach suggested in the CaIEEMod User's Guide <br /> Version 2011.1,Appendix A,Section 4.3(Dust from Material Movement): VMT=As/Wb X 43,560 sq fUacre=5,280 fUmile, <br /> where As is the area to be graded(acres)and Wb is the blade width(feet). For the proposed project,the area to be <br /> graded is approximately 15,000 square feet. Assuming a box grader width of four feet,the above equation yields 0.71 miles <br /> (total)of travel for the grader apparatus. <br /> Emission factor for bulldozing: <br /> Variable Reference Symbol Value Unit 1.Ox�s�l.s <br /> PM�o particle size multiplier EPA AP-42 Table 11.9-1 k 0.75 -- EfP,�o=kx �M\l.a <br /> PM2.5 particle size multiplier EPA AP-42 Table 11.9-1 k 0.105 -- � <br /> Silt content(overburden) EPA AP-42 Table 11.9-1 s 6.9 % 5.7x�s�l.z <br /> Moisture content(overburden) EPA AP-42 Table 11.9-1 M 7.9 % EfP,�, =kx �M\1.3 <br /> Bulldozing PM�o: 0.753 Ib/hour � <br /> PM2.5: 0.414 Ib/hour <br /> Source: U.S.Environmental Protection Agency, Compilation ofAir Pollutant Emission Factors (AP-42),Section 11.9 Western <br /> SurFace Coal Mining,Table 11.9-1. <br /> Page 4 Date: 7/30/2012 <br />