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5.1E:CONSTRUCTION EMISSIONS AND IMPACT ANALYSIS <br /> TABLE 5.1E-2 <br /> Peak Annual Emissions During Project Construction,Tons Per Year <br /> NOx c0 voc sox PM10 PM2.5 <br /> Onsite <br /> Construction Equipment 7.2 4.6 0.7 0.01 0.4 0.4 <br /> Fugitive Dust <br /> -- -- -- -- 1.6 0.3 <br /> Offsite <br /> Worker Travel,Truck 2.3 17.7 1.7 0.02 0.2 0.2 <br /> Deliveries <br /> Total Emissions <br /> Total 9.5 22.4 2.4 0.03 2.2 0.9 <br /> Note: <br /> a. Offsite emissions. <br /> 5.1E.4 Analysis of Ambient Impacts from Onsite Construction <br /> Ambient air quality impacts from emissions during construction of the project were <br /> estimated using an air quality dispersion modeling analysis. The modeling analysis <br /> considers the construction site location, the surrounding topography, and the sources of <br /> emissions during construction,including vehicle and equipment exhaust emissions and <br /> fugitive dust. <br /> 5.1 E.4.1 Existing Ambient Levels <br /> As with the modeling analysis of project operating impacts (Section 5.1.5), ambient <br /> monitoring data collected from monitoring stations in the project area were used to establish <br /> the ambient background levels for the construction impact modeling analysis. Table 5.1E-3 <br /> shows the maximum concentrations of NOx,SO2, CO, and PMlo recorded for 2005 through <br /> 2007. <br /> TABLE 5.1E-3 <br /> Modeled Background Concentrations in the Project Area <br /> Pollutant Averaging Prd 2005 2006 2007 <br /> NO2 1 hour 163.6 135.4 131.6 <br /> annual 32.1 34.0 30.2 <br /> SO2 1 hour 46.8 23.4 44.2 <br /> 3 hour 15.6 13.0 28.6 <br /> 24 hour 7.9 7.9 10.8 <br /> annual 2.7 2.7 2.7 <br /> CO 1 hour 5,375 5,500 4,500 <br /> 8 hour 3,178 2,500 2,567 <br /> 5.1E4 SAC/371322/082330017(LEC_5.1 E_APPENDIX.DOC) <br />