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I= "71 Table a GHG Emissions from Swimming Pools'-Baseline Mountain House Mixed-Use Development-Neighborhoods K&L Shea Homes San Joaquin County,California Total Emissions per Energy Use Factors Energy Use Factors Pool Volumes Emission Factors' (Oakland pools)' (adjusted for Mountain House pools)'4 Annual Energy Use Pool al (Ib CO2!source unit) Source Units tonnes COz/ r) Electricity 1 0.496 (kWh!gal!yr) Electricity 0.496 (kWh!gal 1 yr) 224,416 111,268 (kWh 1 r) 0.833 kWh 229 Natural Gas 0.023 MMBTU! al! r Natural Gas 0.016 MMBTU! al! r 3,527 MMBTU 1 r 117 MMBTU Notes: 1.Only CO2 emissions are estimated and are assumed to be equivalent to total GHG emissions since the contributions from methane(CH 4)and nitrous oxide(N2O)are negligible compared to total GHG for emissions associated with electricity generation and natural gas combustion. The emission factors in the California Climate Action Registry General Reporting Protocol show that CH4 and N2O emissions(in CO2e)are less than 1%of CO2 emissions for these processes. 2.The weighted energy consumption of 5 Oakland pools is used to calculate the baseline energy use of an average sized pool within the project site. 3.ENVIRON adjusted the natural gas usage to account for savings from high-efficiency heaters. ENVIRON conservatively assumed that the Oakland pools used 78%efficient heaters,which is the minimum efficiency legally required(see 10 CFR Part 431). According to the U.S.Department of Energy,newer pools are likely to use heaters with 89-95%efficiency(see http:/Avww.energysavers.gov/your_home/wate!_heatingrndex.cfm/mytopic=13170). ENVIRON conservatively assumed 90%efficiency for Mountain House pool heaters,resulting in a 12%savings over the Oakland pools. 4.ENVIRON adjusted the natural gas usage to account for the difference in average ambient temperature in Tracy and Oakland. The natural gas usage was multiplied by the following adjustment factor: (typical pool temperature-Tracy average ambient temperature)/(typical pool temperature-San Francisco-Richmond average ambient temperature)_(80 deg F-60.9 deg F)1(80 deg F-55-5 deg F). Typical pool temperature based on information from the Department of Energy,available at:http:l/www.energysavers.gov/your_homelwater heatinglndex.ctmlmytopic=13300. Average ambient temperatures for Tracy and San Francisco-Richmond were obtained from the Western Regional Climate Center:http:/Avww.wrce.dri.edu/. 5. ENVIRON used the surface area of the swimming pool in North Community Park provided by Shea Homes and conservatively assumed an averaged depth of 8 h. 6.Emission factor for electricity is Cal EEMod default for Modesto Irngalion District. Emission factor for natural gas is obtained from California Climate Action Registry Reporting Protocol,Table C7. 7.Emissions for a single pool,assuming no solar heating. Abbreviations: CARE 2020 NAT-California Air Resources Board Scoping Plan projections for 2020 if no actions are taken CO2-carbon dioxide CH4-methane It-foot kWh-kilowatt-hour Ib-pound MMBTU-Million British Thermal Units N20-nitrous oxide yr-year Sources: California Climate Action Registry General Reporting Protocol,Version 3.1(January 2009). Available at:http:l/www,climateregistry,org/resourcesldocslprotocols/grp/GRP_3.1_January20O9.pdi California Climate Action Registry.2008.Database:Modesto Irrigation District 2007 PUP Report.Available at:https:/lwww.climateregistry.org/CARROT/public/Reports.aspx Energy Efficient Commercial Pool Program;Preliminary Facility Reports for DeFremery Pool,Fremont Pool,Live Oak Pool,Lyons Pool,and Temescal Pool.City of Oakland!Oakland Unified School District.October 2006. Managing Swimming Pool Water Temperature for Energy Efficiency(September 2009).U.S.Department of Energy.Available at: http:llwww.energysavers.gov/your_homelwater heatingrndex.cfmlmytopic=13300 Determining Gas Swimming Pool Healer Energy Efficiency(September 2009).U.S.Department of Energy.Available at:http:l/www.energysavers.govtyour_homelwater_healingPndex.cfmtmytopi�13170 Energy Efficiency Program for Certain Commercial and Industrial Equipment:Efficiency Standards for Commercial Heating,Air-Conditioning,and Water-Heating Equipment.U.S.Department of Energy,10 CFR Part 431.Available at:http:Ilwwwl,eere.energy.govlbuildingslappliance_standardstoommerciallpdtslashrae_final_rule_030707.pdf