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106 <br /> Orange County, approximately 65,000 are not covered by the local wastewater agency. <br /> This results in widespread use of septic systems for wastewater disposal. Emissions from <br /> these systems can be calculated using a population-based method,which incorporates a <br /> CH4 Emissions Factor of 0.048213 MT CH4 per daily kg BOD5.An alternative calculation <br /> approach is documented in the US Community Protocol under reference WW.11 (aIt).21 <br /> FUGITIVE EMISSIONS <br /> Fugitive emissions were calculated by usage data summed from natural gas. This was <br /> multiplied bya leakagefactorofan industry standard recommended bythe U.S.Community <br /> Protocol.28 The leakage emissions are multiplied by an emissions factor of 6.1939x10-5 MT <br /> CH4/MMBtu natural gas used, and CO2 emission factor of 6.6316 x 10-5 MT CO2/MMBtu <br /> natural gas used. <br /> COUNTY OPERATIONS INVENTORY <br /> BUILDING AND FACILITIES <br /> Orange County's buildings and facilities emissions were calculated using usage data <br /> obtained from the government's tracking software.This software monitors both electricity <br /> and natural gas usage data.The calculations were carried out in the same manner as those <br /> for the community inventory of natural gas and electricity. <br /> VEHICLE FLEET <br /> Fuel usage for Orange County's vehicle fleet was supplied by the County and calculated <br /> using the US Community Protocol.29 The annual miles traveled, and annual fuel usage are <br /> tracked and multiplied by emission factors from ICLEI. These include a CO2 Emissions <br /> Factor of 0.070268 MT/MMBtu, a Biogenic CO2 Emissions Factor of 0 MT/MMBtu, a CH4 <br /> Emissions Factor of 2.153 x10-8 MT/vehicle mile, a Biofuel CH4 Emissions Factor of 0 MT/ <br /> vehicle mile, a N20 Emissions Factor of 1.248 x10-8 MT/vehicle mile, and a Biofuel N20 <br /> Emissions Factor of 0 MT/vehicle mile. <br /> TRANSIT FLEET <br /> Data on Orange County's transit fleet usage was also provided by the County. This data <br /> was broken down by vehicle types, with transit fleet vehicles identified as buses within <br /> the data sheet. Emission factors for transit fleet buses include a CO2 Emissions Factor <br /> of 0.07024 MT/MMBtu, a CH4 Emissions Factor of 1.93 x 10-8 MT/vehicle mile, and a N20 <br /> Emissions Factor of 1.48 x10-8 MT/vehicle mile.ao <br /> 2e https://www.edf.org/sites/default/files/US-Natural-Gas-Leakage-Model-User-Guide.pdf <br /> 29 U.S.Community Protocol for Accounting and Reporting of Greenhouse Gas Emissions Appendix D: <br /> Transportation and Other Mobile Emission Activities and Sources <br /> 31 U.S.Community Protocol for Accounting and Reporting of Greenhouse Gas Emissions Appendix D: <br /> Transportation and Other Mobile Emission Activities and Sources <br /> 18 ORANGE COUNTY, NC • APPENDICES <br />