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Methane
<br />A. Direct Sources
<br />A1. Mobile Source (Construction Equipment)
<br />Emissions of methane from construction equipment are calculated using the following equation:
<br />-1-1
<br />Y = (M)*(E)*(C)*(C)
<br />A12
<br />Y = annual emissions of methane from construction equipment, tons/yr.
<br />A
<br />M = annual mileage for construction equipment, miles/yr.
<br />E = emission factor for construction equipment, 0.2012 gr/mile (USEPA Direct Emissions from Mobile Combustion Sources, Climate Leaders,
<br />2004).
<br />C = conversion factor from gr to lbs, 453.59 gr/lbs.
<br />1
<br />C = conversion factor from lbs to tons, 2,000 lbs/ton.
<br />2
<br />M*, miles/yrE, gr/mile
<br />Unit TypeC, gr/lbsC, lbs/tonsY, tons/yr
<br />12A
<br />Non cat heavy-duty truck416,625.000.2012453.592,0000.09
<br />* M = annual mileage for construction equipment based on the ratio between annual emissions of carbon dioxide from construction equipment
<br />(URBEMIS 2007 9.2.2 output file) and the emission factor for carbon monoxide from construction equipment based on the following EMFAC
<br />criteria: 2008 calendar year, all heavy-duty trucks, temperature of 43°F, relative humidity of 74% (average between 63% and 84%, January AM and
<br />PM), and speed of 10 miles/hr.
<br />A2. Mobile Source (Motor Vehicles)
<br />Emissions of methane from motor vehicles are calculated using the following equation:
<br />-1-1
<br />Y = (M)*(E)*(C)*(C)
<br />A12
<br />Y = annual emissions of methane from motor vehicles, tons/yr.
<br />A
<br />M = annual mileage for motor vehicles, miles/yr (URBEMIS 2007 9.2.2 output file).
<br />E = emission factor for motor vehicles, gr/mile (USEPA Direct Emissions from Mobile Combustion Sources, Climate Leaders, 2004).
<br />C = conversion factor from gr to lbs, 453.59 gr/lbs.
<br />1
<br />C = conversion factor from lbs to tons, 2,000 lbs/ton.
<br />2
<br />Unit TypeM, miles/yrE, gr/mileC, gr/lbsC, lbs/tonsY, tons/yr
<br />12A
<br />Non cat passenger car0.000.1931453.592,0000.00
<br />Cat passenger car77275057.440.1127453.592,0009.60
<br />Diesel passenger car0.000.0161453.592,0000.00
<br />Non cat light-duty truck0.000.2253453.592,0000.00
<br />Cat light-duty truck70191510.510.1448453.592,00011.20
<br />Diesel light-duty truck0.000.0966453.592,0000.00
<br />Non cat heavy-duty truck0.000.2012453.592,0000.00
<br />Cat heavy-duty truck5473488.910.1448453.592,0000.87
<br />Diesel heavy-duty truck4024903.560.0161453.592,0000.07
<br />Non cat motorcycles1287917.620.2092453.592,0000.30
<br />Cat motorcycles2736824.950.2092453.592,0000.63
<br />Total, tons/yr22.67
<br />A3. Mobile Source (Landscape Equipment)
<br />Emissions of methane from landscape equipment are calculated using the following equation:
<br />Y = (YA)*(R)
<br />A21T
<br />Y = annual emissions of methane from landscape equipment, tons/yr.
<br />A2
<br />Y= annual emissions of methane from motor vehicles, tons/yr.
<br />A1
<br />R = ratio between carbon monoxide unmitigated emissions from motor vehicles and carbon monoxide unmitigated emissions from landscape
<br />T
<br />equipment, (URBEMIS 2007 9.2.2 output file).
<br />Y, tons/yrR *Y, tons/yr
<br />A1TA2
<br />22.670.000070.00
<br />Page 5 of 13
<br />A4. Stationary Source (Cooling and Heating)
<br />Emissions of methane from cooling and heating are calculated using the following equation:
<br />-1
<br />Y = (U)*(E)*(C)
<br />AA
<br />Y = annual emissions of methane from cooling and heating, tons/yr.
<br />A
<br />U = annual natural gas usage, MMBTUs/yr.
<br />A
<br />E = emission factor for natural gas usage, 0.0059 kg/MMBTU (California Climate Action Registry General Reporting Protocol, Version 2.2, Part III,
<br />Chapter 8, 2007).
<br />C = conversion factor from kg to tons, 907.18 kg/ton.
<br />E,
<br />UnitA **Unitkg/MMBTUC, kg/ton
<br />Land Use TypeR *U, MMBTUs/yrY, tons/yr
<br />AAA
<br />household
<br />SF Residential83.97900MMBTUs/unit/y335.0028,132.970.0059907.180.18
<br />MF Residential50.54490MMBTUs/unit/y3,740.00household189,037.930.0059907.181.23
<br />Food Storesq ft
<br />0.03654MMBTUs/unit/y0.000.000.0059907.180.00
<br />sq ft
<br />Restaurant0.03654MMBTUs/unit/y0.000.000.0059907.180.00
<br />Hospitals0.03654MMBTUs/unit/y0.00sq ft0.000.0059907.180.00
<br />Retail0.03654MMBTUs/unit/y387,000.00sq ft14,140.980.0059907.180.09
<br />Commercialsq ft
<br />0.03654MMBTUs/unit/y0.000.000.0059907.180.00
<br />sq ft
<br />College/University0.06048MMBTUs/unit/y0.000.000.0059907.180.00
<br />High school0.06048MMBTUs/unit/y0.00sq ft0.000.0059907.180.00
<br />Elementary Schoolsq ft
<br />0.06048MMBTUs/unit/y0.000.000.0059907.180.00
<br />sq ft
<br />Office0.02520MMBTUs/unit/y0.000.000.0059907.180.00
<br />Hotel/Motel0.06048MMBTUs/unit/y0.00room0.000.0059907.180.00
<br />Warehouse0.00000MMBTUs/unit/y0.00sq ft0.000.0059907.180.00
<br />Miscellaneous0.00000MMBTUs/sqft/y680,000.00sq ft0.000.0059907.180.00
<br />Total, tons/yr1.50
<br />* R = annual consumption rate (CEQA Handbook, Table A9-12-A). Converted from cubic feet/unit/month to MMBTUs/Unit/year
<br />A
<br />** A = unit type number (number of units)
<br />B. Indirect Sources
<br />B1. Electricity
<br />Emissions of methane from electricity usage are calculated using the following equation:
<br />-1
<br />Y = (U)*(E)*(C)
<br />AA
<br />Y = annual emissions of methane from electricity usage, tons/yr.
<br />A
<br />U = annual electricity usage, MWh/yr.
<br />A
<br />E = emission factor for electricity usage, 0.0067 lbs/MWh (California Climate Action Registry General Reporting Protocol, Version 2.2, Part III,
<br />Chapter 6, 2007).
<br />C = conversion factor from lbs to tons, 2,000 lbs/ton.
<br />UnitA **UnitE, lbs/MWhC, lbs/ton
<br />Land Use TypeR *U, MWh/yrY, tons/yr
<br />AAA
<br />Residential5.6265MWh/unit/yr4,075units22,927.990.00672,0000.08
<br />Food Store
<br />0.0410MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Restaurant0.0402MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Hospitals0.0196MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Retail
<br />0.0141MWh/sqft/yr387,000sqft5,456.700.00672,0000.02
<br />College/University0.0124MWh/sqft/yr0sqft0.000.00672,0000.00
<br />High school0.0075MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Elementary School0.0075MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Office
<br />0.0131MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Hotel/Motel0.0177MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Warehouse0.0121MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Miscellaneous0.0200MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Construction13.6300MWh/sqft/yr0sqft0.000.00672,0000.00
<br />Total, tons/yr0.10
<br />* R = annual consumption rate (CEQA Handbook, Table A9-11-A). Converted from KWh/unit/year to MWh/Unit/year
<br />A
<br />** A = unit type number. (number of units)
<br />Page 6 of 13
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