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Construction Air Permit 4.0 EXPECTED EMISSIONS 4. 1 CHEMICAL NATURE OF AIR POLLUTION EMISSIONS LFG is the product of the natural decomposition of organic materials(e.g. food,yard waste, etc.) deposited in a landfill environment. At municipal landfill sites, LFG as generated typically contains about 40 to 50 percent methane and 30 to 45 percent carbon dioxide by volume. LFG is also comprised of residual amounts of nitrogen, oxygen(02) and a number of trace constituents, including NMOCs, VOCs, and some HAPs. When there is no LFG analytical data available for a particular chemical,the Waste Industry Air Coalition(WIAC) and Environmental Protection Agency's (EPA's) "Compilation of Air Pollution Emission Factors" (AP-42) were used as appropriate for emission estimates and included in Appendix E. 4.2 EMISSIONS Table 1 provides estimates of the pollutant emissions that may be expected from the proposed IC engines. The concentrations of VOC,NMOCs and HAPs were taken from the "Waste Industry Air Coalition Comparison of Recent Landfill Gas Analyses with Historic AP-42 Values", and AP-42 Tables 2.4-1 and 2.4-2 since site-specific data were not available. Criteria pollutants generated during combustion in the engines, such as NOX, CO, PM-10, SOx and VOCs were determined using the following performance specifications: ® 0.15 grams per brake horsepower(g/bhp-hr)NOx • 1.8 g/bhp-hr CO • 0.07 g/bhp-hr PM-10 • 150 parts per million by volume (ppmv) SOx • 20 ppmv VOCs as hexane at 3% oxygen or 98% destruction efficiency by weight It is understood that similar to the draft ATCs that were issued by SJVAPCD in March 2011 for the Ameresco Foothill, LLC LFGTE facility, there will be an ammonia limit associated with ammonia slip on the engine treatment system. Ameresco assumes that the same limit of 15 ppmv @15% oxygen for ammonia will apply for this application. Table 2 provides estimates of the pollutant emissions that may be expected from the proposed flare. The concentrations of VOC,NMOCs and HAPs were taken from the "Waste Industry Air Coalition Comparison of Recent Landfill Gas Analyses with Historic AP-42 Values", and AP-42 Tables 2.4-1 and 2.4-2 since site-specific data were not available. Criteria pollutants generated during combustion in the flare, such as NO, CO, PM-10, and SOx were determined using the following performance specifications: • 0.0041 lb/MMBtu NOx • 0.20 lb/MMBtu CO • 150 ppmv SO2 • 0.2 lb/MMBtu PM-10 • 20 ppmv VOCs as hexane at 3% oxygen or 98%destruction efficiency by weight 6