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TABLE 1 POTENTIAL TO EMIT SOURCE ESTIMATES FOR TWO(2)INTERNAL COMBUSTION(IC)ENGINES-100%LOAD FORWARD LANDFILL MANTECA,CALIFORNIA Variables: MODEL INPUT VARIABLES: POTENTIAL TO EMIT Methane Concentration 50.0% Genset horsepower 3,012 hp Fuel Value 319 Btu/of Landfill Gas Collection Rate(single IC Engine) 942 SCFM Max LFG Exhaust Rate from Engines 5,565 SCFM Oxygen Content in Exhaus4 10 % Maximum Availability of Engine(Annualf 100.0 % Criteria pollutant emission factors used for IC Engines Pollutant Emission factor Data Source NMOCs/VOCS:20 ppmv @ 3%02 as hexane(outlet) BACT/NSPS Lowest achievable emission levels with CO 1.8g/bhp-hr backend controls Lowest achievable emission levels with NO, 0.15 g/bhp-hr backend controls S02 150ppmv BACT PM,,IPM 0.07 g/bhp-hr - BACT Notes: 'List of hazardous air pollutants was from Title III Clean Air Act Amendments,1990,and include compounds found in landfill gas,as determined from a list in AP-42 Tables 2.4-1("Default Concentrations for Landfill Gas Constituents,11/98"). 2 Average concentration of HAPS found in LFG were taken from'1Naste Industry Air Coalition Comparison of Recent Landfill Gas Analyses with Historic AP-42 Values"since site specific data was unavailable. 3 Based on a maximum Bow rate into the IC Engine of 942 scfm r@ 50%methane at 319 BTU/scf °Values based on AP-42,Table 2.4-3:93%for halogenated species,and 86.1%for non-halogenated species. For xylenes,98%control efficiency is used,since xylenes is considered the compound that is easier to destroy among NMOCs. I Concentration of HCI and Mercury is based on AP-42 Section 2.4(11/98) s VOC emissions are equal to NMOL emissions 2 Reduced Sulfur Compound Concentration,per SCAOMD Rule 431.1 e 5,565 scfm LFG exhaust rate based on 10%oxygen per manufacturer. e Maximum Availability of IC engines based on plant-wide annual limit. Emissions from the Engine[ton/yr]=(Molecular Weight of SO2/Molecular Weight of 1-125)`((Molecular Weight of 1-125[g/mol[)`(Concentration of Compound[ppmvy1,000,000) '(LFG Flow to Engine[cfm])'(60 min/hr)'(24 hr/day)'(365 day/year)'(tton/2000l1b)`(1 lb/453.6g)`(1 mol/24,04L @ 8TP)`(28.32L11cf)) (VOC) Emissions from the Engine[ton/yr]=((Molecular Weight of NMOC as hexane[,/mol])'(Concentration of Compound[pprrn']/1,000,000) `(Exhaust rate from Engine[cfm])`(60 min/hr)•(24 hr/day)`(365 day/year)yltonf20001b)`(l lb/453.6g)`(1 moV24.04L @ STP)`(28.321J1 cf)) r