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The calculated generation rates were input into a spreadsheet sheet model to estimate the <br /> level of LFG recovery required to maintain the NMOL emission rate below 50 Mg/yr based <br /> on the following assumptions: <br /> • The landfill will have phased closure; LFG recovery rate in closure areas is 100% <br /> (i.e. no emissions). <br /> • Flare Emission Rate is 1% (i.e. 99% destruction efficiency of NMOC). <br /> • Total Emission of NMOC is equal to Flare Emissions plus Active Area Emissions. <br /> • Active area (i.e. areas not having a final cover system installed) recovery may be <br /> required to maintain NMOL emissions below 50 Mg/yr. <br /> • The starting year of landfill operation is 2002. <br /> 3.2 Emission Model Results <br /> Assuming that there is only LFG recovery in the phased closure areas of the landfill (i.e. no <br /> active area recovery),the year in which the 50 Mg/yr NMOL emission rate is exceeded is as <br /> follows: <br /> • @ 500 ppm: 50 Mg/yr emission level is not exceeded during life of landfill. <br /> Maximum emission rate is approximately 45 Mg/yr in 2053. <br /> • @ 1,000 ppm: 50 Mg/yr emission level is exceeded in 2015. <br /> • @ 4,000 ppm: 50 Mg/yr emission level is exceeded in 2003. <br /> y Because 4,000 ppm is the proposed concentration value for the Tier One analysis under the <br /> proposed Rule, a Tier Two analysis will likely be required for the Austin Road Landfill <br /> Expansion to derive a site-specific NMOC concentration factor. <br /> To maintain the NMOL emission rate below 50 Mg/yr for 1,000 ppm and 4,000 ppm NMOL <br /> concentrations, recovery of landfill gas in the active landfill areas would be required. As <br /> used in the context of this report the term "active" areas includes areas with intermediate <br /> _. cover. Table 1 below summarizes the LFG percentage required to be recovered by the end <br /> of each phase in the "active" landfill areas. Based on this analysis up to 46% LFG recovery <br /> in the active landfill area could be required for NMOL concentrations of 1,000 ppm and up <br /> to 89% recovery could be required for NMOC concentrations of 4,000 ppm. However, as <br /> stated above, the 1,000 ppm level is expected to be the higher limit of NMOC <br /> concentrations for the landfill. <br /> WW-1811-CAl-AA/3110 Austin Road Landfill Expansion August 3, 1995 <br /> MLI037.DOC Landfill Gas Generation and Emissions Page 5 <br />