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4.5 AIR QUALITY <br /> Emissions have been estimated for these sources assuming summer conditions (high temperatures, low <br /> soil moisture content, high average windspeed) and 16 hours of daily activity to evaluate project impacts <br /> under worst-case conditions. The assumptions and methodology used in calculating this estimates are <br /> documented in Appendix D. The resulting project emissions are shown in Table 4.5-3. <br /> TABLE 4.5-3 <br /> WORST-CASE PROJECT CONSTRUCTION EMISSIONS <br /> i POUNDS/DAY <br /> Source ROG NOX CO PM-10 SOX <br /> Haul Truck Exhaust 6.6 32.9 20.0 4.7 7.9 <br /> On-site Equipment Exhaust 15.5 109 28.5 6.6 12.5 <br /> Truck Loading Fugitive Dust - - - 5.0 - <br /> Haul Road Fugitive Dust - - - 76.8 - <br /> Total 22.1 142 48.5 93.1 20.4 <br /> SJVAPCD-SJU Threshold 150 150 550 80 150 <br /> ROG = Reactive Organic Gases <br /> NOX = Nitrogen Oxides <br /> CO = Carbon Monoxide <br /> PM-10 = Particulate Matter, 10 Micron <br /> SOX = Sulfur Oxides <br /> The emissions shown in Table 4.5-3 would affect local air quality along the haul route and near the <br /> excavation site. Project traffic along the haul route would average about eight trucks per hour, an <br /> increase in traffic that would not have a measurable impact on air quality at residences located adjacent <br /> the route. This impact is less than significant. <br /> On-site emissions would primarily occur at the excavation area and along the graveled haul road. The <br /> bulk of the particulate matter emissions from the project would occur at these locations. Elevated <br /> concentrations of particulate matter can be expected to occur directly downwind of the excavation area <br /> and the graveled haul road. However, because of the size of the entire parcel, these activities would <br /> not occur near any existing residences or other sensitive receptors, and the potential for nuisance would <br /> be very low. This impact is considered less than significant. <br /> 4.5-7 <br />