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Proposed Costco Wholesale Redwood City GDF Expansion 7.A. - Page 170 Air Quality/Climate Change Analysis Appendix A: Construction Emission Calculations Table A-1. Construction Emissions-Summary. Emissions(Pounds per Day) Exhaust PM Fugitive PM Greenhouse Gases(GHGs) Construction Phase/Task Resources ROG NOx PM,o P�/�zs P�`/�,o P�/�zs CO SO2 CO2 CH, N20 CO2e Phase 1: Demolition/Site Preparation. Fugitive Dust 0.01 0.00 -- a.TemporaryFencing, Off-roadCombustion 1.46 10.87 0.69 0.64 6.79 0.013 1,121.79 0.063 0.028 1,131.81 AsphaltRemoval On-roadCombustion 0.60 10.21 0.76 0.42 3.01 0.016 1,695.15 0.049 0.059 1,714.58 Off-gassing -- -- 2.07 21.08 1.44 1.06 0.01 0.00 9.80 0.029 2,816.94 0.112 0.087 2,846.39 Fugitive Dust 0.37 0.04 -- b.Sub-grade Earthwork Off-road Combustion 1.68 12.23 0.82 0.76 7.98 0.015 1,284.56 0.072 0.032 1,296.04 On-road Combustion 0.41 6.81 0.51 0.28 2.06 0.011 1,137.88 0.034 0.040 1,151.02 Off-gassing -- -- 2.09 19.04 1.33 1.04 0.37 0.04 10.04 0.026 2,422.44 0.105 0.072 2,447.06 Fugitive Dust 4.01 2.21 -- c.Relocate Storm Drain Off-road Combustion 0.58 3.77 0.33 0.31 2.73 0.005 396.91 0.022 0.010 400.46 On-road Combustion 0.03 0.03 0.04 0.01 0.33 0.000 46.68 0.004 0.003 47.79 Off-gassing -- -- 0.62 3.80 0.37 0.32 4.01 221 3.06 0.005 443.59 0.026 0.013 44825 d.Initial Concrete Work- Fugitive Dust 2.41 1.32 -- Retaining Wall,Footings, Off-road Combustion 0.35 2.26 0.20 0.18 1.64 0.003 238.15 0.013 0.006 24028 Curbs On-road Combustion 0.11 0.87 0.13 0.05 0.84 0.002 221.50 0.012 0.011 225.09 Off-gassing -- -- 0.46 3.13 0.33 024 2.41 1.32 2.48 0.005 459.65 0.025 0.017 465.37 Phase 2: Fuel System,Paving,Canopy. Fugitive Dust -- -- -- a.Fuel System Off-road Combustion -- -- -- -- -- -- -- -- -- -- On-road Combustion 0.05 0.05 0.06 0.02 0.49 0.001 70.02 0.006 0.005 71.68 Off-gassing -- -- 0.05 0.05 0.06 0.02 -- -- 0.49 0.001 70.02 0.006 0.005 71.68 Fugitive Dust 0.01 0.00 -- b.Paving: Prepare Base Off-road Combustion 1.10 8.46 0.49 0.45 5.25 0.010 887.65 0.050 0.022 895.58 On-road Combustion 0.77 13.58 0.96 0.55 3.63 0.021 2,205.74 0.061 0.075 2,230.35 Off-gassing -- -- 1.86 22.04 1.45 1.00 0.01 0.00 8.88 0.031 3,093.39 0.110 0.097 3,125.93 Fugitive Dust -- -- -- c.Paving: Concrete Apron Off-road Combustion -- -- -- -- -- -- -- -- -- -- On-road Combustion 0.37 4.69 0.46 0.22 2.37 0.009 907.53 0.035 0.037 919.70 Off-gassing -- -- 0.37 4.69 0.46 022 -- -- 2.37 0.009 907.53 0.035 0.037 919.70 Fugitive Dust -- -- -- d.Paving: Asphalt Off-road Combustion 1.42 8.67 0.76 0.70 5.18 0.008 721.66 0.040 0.018 728.11 Surtaces On-road Combustion 0.03 0.03 0.04 0.01 0.33 0.000 46.68 0.004 0.003 47.79 Off-gassing 0.26 -- 1.71 8.70 0.80 0.71 -- -- 5.51 0.009 768.34 0.045 0.021 775.90 Fugitive Dust -- -- -- e.Canopy Installation and Off-road Combustion 1.89 13.08 0.97 0.90 8.35 0.016 1,342.39 0.075 0.034 1,354.39 Finishes On-road Combustion 0.05 0.05 0.06 0.02 0.49 0.001 70.02 0.006 0.005 71.68 Off-gassing -- -- 1.94 13.12 1.03 0.91 -- -- 8.84 0.016 1,412.41 0.081 0.039 1,426.07 Fugitive Dust -- -- -- f.Landscaping/Striping Off-road Combustion 0.19 1.15 0.11 0.10 0.71 0.001 102.00 0.006 0.003 102.91 On-road Combustion 0.06 0.06 0.08 0.02 0.65 0.001 93.36 0.009 0.007 95.57 Off-gassing 2.78 -- 3.04 121 0.18 0.12 -- -- 1.36 0.002 195.36 0.014 0.009 198.48 Summary: Maximum Daily Emissions(pounds/day) 4.98 3521 2.54 1.93 4.01 221 1820 0.048 4,575.82 0.198 0.141 4,623.68 DailyAverageEmissions(pounds/day) 1.97 12.07 0.95 0.76 0.72 0.38 7.37 0.016 1,486.44 0.074 0.046 1,502.14 BAAQMD Significance Thresholds(pounds/day) 54 54 82 54 BMPs BMPs None None None None None None Significant? No No No No (2) (2) N/A N/A N/A N/A N/A N/A Notes: 1. Source for BAAQMD significance thresholds: Bay Area Air Quality Management District,California Environmental Quality Act Air Quality Guidelines,May 2011, Section 2.6(Construction-Related Impacts-Project Level). 2. For all proposed projects,the BAAQMD recommends implementing the Basic Construction Mitigation Measures listed in Table 8-1 of its CEQA Guidelines,to meet the Best Management Practices threshold for fugitive dust emissions,regardless of the quantity of fugitive dust emissions. 3. Conversion factors: Global warming potential for methane: 21 Global warming potential for nitrous oxide: 310 Page 2 Date: 7/30/2012