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5.1 AIR QUALITY <br /> The NO,CO, and VOC startup and shutdown emission rates used in calculating maximum <br /> hourly, daily,quarterly,and annual emissions from the LEC are shown in Table 5.1-19. SO2 <br /> and PM10 emissions are not included in this table because emissions of these pollutants will <br /> not be higher during startup than during baseload facility operation. <br /> Under cold start conditions,where the CTG has been shut down for more than 12 hours,it is <br /> assumed that the CTG will require 6 hours to come into compliance with permitted emission <br /> rates. Under hot start conditions,where the CTG has been shut down for less than 12 hours, <br /> it is assumed that the CTG can come into compliance in 2 hours. <br /> TABLE 5.1-19 <br /> Maximum CTG Startup and Shutdown Emission Rates <br /> NO. CO VOC <br /> Startup, pounds per maximum hour 160 900 16 <br /> Startup, pounds per average hour 100 900 16 <br /> Shutdown, pounds per hour 100 900 16 <br /> 5.1.3.4.2 Criteria Pollutants: Auxiliary Boiler <br /> The emission rates for the auxiliary boiler shown in Table 5.1-20 are based on manufacturers' <br /> guaranteed emission rates and best available control technology requirements. The BACT <br /> determination is provided in Appendix 5.1C. Emission rates and calculated hourly emissions <br /> for this unit are shown in Appendix 5.1A,Table 5.1A-4. <br /> TABLE 5.1-20 <br /> Maximum Emission Rates-Auxiliary Boiler <br /> Pollutant ppmv @ 3%02 Ib/MMBtu Ib/hr <br /> NOX 7.0 0.0084 0.6 <br /> S02a 1.69 0.0028 0.2 <br /> CO 50 0.0365 2.4 <br /> VOC 10 0.0042 0.3 <br /> PM10/PM2.5b -- - 0.5 <br /> aBased on maximum natural gas sulfur content of 1 gr/100 scf(see text). <br /> bIncludes front and back half. <br /> 5.1.3.4.3 Criteria Pollutants: Cooling Tower <br /> The emission rates for the cooling tower are based on manufacturer's drift rate and the <br /> maximum cooling water TDS level. Emissions calculations for this unit are shown in <br /> Appendix 5.1A,Table 5.1A-5. <br /> 5.1.3.4.4 Criteria Pollutant Emissions Summary for the New Equipment <br /> Maximum facility emissions are shown in Table 5.1-21. The emission calculations are based <br /> on the CTG/HRSG and auxiliary boiler emission rates shown in Tables 5.1-18 and 5.1-19; the <br /> fuel use limitations in Table 5.1-17;and the operating assumptions shown in Tables 5.1-15 <br /> and 5.1-16.Maximum daily operations are based on full-load operation of the turbine for <br /> 24 hours with 12 hours of duct firing for PM10 and SO, and with 6 hours of cold start, <br /> 5.1-26 SAC/371322/082410013(LEC_5.1_AIR_QUALITY.DOC) <br />