ARCHIVED REPORTS LEC APPLICATION FOR CERTIFICATION

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5.1 AIR QUALITY under startup conditions. However,because the 1-hour average NO2 impacts are driven by impacts from the auxiliary boiler, impacts under startup conditions are only marginally higher than impacts during normal turbine operation. TABLE 5.1.27 Summary of Results from Refined Modeling Analysis for Permitted Sources Modeled Concentration (µg/m) Inversion Breakup Pollutant Averaging Time Normal Operation Fumigation' Startup NO2 1-hourb 27.5 2.9 31.8 annual 0.3 -- -- S02 1-hour 10.4 1.1 -- 3-hours 7.6 1.0 -- 24-hours 2.9 0.5 -- annual 0.1 -- -- CO 1-hour 132.9 2.7 323.8 8-hours 110.5 1.9 -° P M 10 24-hours 3.7d 0.9 -- annual 0.9 -- -- 'Inversion breakup is a short-term phenomenon and does not affect annual impacts. b1-hour average NO2 impacts were ozone-limited using PVMRM. 'Included in 8-hour impacts for normal operations. dHighest impact for 2001 met data. Second highest concentration is 3.3 pg/m3 based on 2004 met data. To determine a project's air quality impacts, the modeled concentrations are added to the highest reported background ambient air concentrations and then compared to the applicable ambient air quality standards. The highest reported background ambient concentrations were discussed in Section 5.1.1.3 and the monitored concentrations during the past 3 years are shown in the Table 5.1-28. More detailed discussions of why the data collected at these stations are representative of ambient concentrations in the vicinity of the project are provided in Sections 5.1.1.3.2 and 5.1.7. TABLE 5.1-28 Highest Reported Background Concentrations in the Project Area Pollutant Averaging Period 2005 2006 2007 NO2 1 hour 163.6 135.4 131.6 annual 32.1 34.0 30.2 SO2 1 hour 46.8 23.4 44.2 3 hour 15.6 13.0 28.6 24 hour 7.9 7.9 10.8 annual 2.7 2.7 2.7 CO 1 hour 5,375 5,500 4,500 8 hour 3,178 2,500 2,567 5.1-40 SAC/371322/082410013(LEC_5.1_AIR_QUALITY.DOC)