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5.1 AIR QUALITY <br /> and emission rates. Maximum NO, CO, and VOC emissions for each quarter are based on <br /> expected operations,including startups and duct firing,which are characteristic of the <br /> quarter. Maximum SO2 and PM10/PM2.54 emissions are based on full-time operations, <br /> including duct firing. The quarterly operating profiles summarized in Table 5.1-15 below <br /> were used as the basis for the calculation of quarterly and annual emissions. These <br /> calculations are shown in more detail in Appendix 5.1A, Table 5.1A-6. <br /> TABLE 5.1.15 <br /> Quarterly and Annual Operations for the CTG and HRSG <br /> Duct Firing Base Load Total Heat Input, <br /> Hot Start Hours Cold Start Hours Hours Hours MMBtu (HHV) <br /> Q1 100 42 350 1,184 4,149,888 <br /> Q2 100 42 350 1,208 4,195,135 <br /> Q3 40 36 1100 800 4,406,844 <br /> Q4 72 36 700 1,040 4,318,064 <br /> Annual 312 156 2,500 4,232 17,069,130 <br /> 5.1.3.2.2 New Auxiliary Boiler <br /> The auxiliary steam boiler will provide steam during plant start-up and shut-down to allow <br /> startups and shutdowns to be accomplished more quickly. During pre-start activities and <br /> during the initial phases of start-up, steam for sealing,warming the steam turbine (optional), <br /> heating/re-heating condensate (condenser sparging steam), and combustion turbine fuel gas <br /> heating will be supplied from the auxiliary boiler. Because the auxiliary boiler will be used <br /> mainly to support turbine startup activities, quarterly and annual boiler emissions are <br /> calculated based on projected turbine startup hours. The quarterly operating profile assumed <br /> for the auxiliary boiler is shown in Table 5.1-16. NCPA proposes that the daily and quarterly <br /> operating limitations on auxiliary boiler operation be expressed in terms of heat input rather <br /> than hours of operation. <br /> TABLE 5.1.16 <br /> Daily,Quarterly and Annual Operations for the Auxiliary Boiler <br /> Proposed Fuel Use Limitation for Period <br /> Total Hours (MMBtu HHV) <br /> Daily 12" 780 <br /> Q1 142 9,230 <br /> Q2 142 9,230 <br /> Q3 76 4,940 <br /> Q4 108 7,020 <br /> Annual 468 30,420 <br /> *Although the auxiliary boiler is expected to operate only during CTG startup, maximum daily emissions from the <br /> unit are evaluated assuming up to 12 hours per day of operation to provide maximum operational flexibility. <br /> 4 All combustion PM is assumed to be less than 2.5 microns in diameter;therefore all PM10 is assumed to be PM2.5. <br /> SACI3713221082410013(LEC_5.1_AIR_QUALITY.DOC) 5.1-23 <br />