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Table 7 GHG Emissions from Swimming Pools'-Project Mountain House Mixed-Use Development-Neighborhoods K&L Shea Homes San Joaquin County,California Energy Use Factors Energy Use Factors Pool Volume Emission Factors a Total Emissions per Pool' Total Emissions per Pool (Oakland pools (adjusted for Mountain House poolsAnnual Energy Use Without Solar Heating Assuming Solar Heatin j° a3 (Ib CO2/source unit Source Units tonnes CO I r tonnes CO, / r Electricity, 1 0.496 1 (kWh 1 gal 1 yr) Electricity 0.496 (kWh 1 gal!yr) 224,416 111,268 (kWh 1 yr) 0.752 kWh 225 38 Natural Gas 0.023 MMBTU 1 al 1 r Natural Gas 0.016 MMBTU l 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)and nitrous oxide(N20)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 Cflfand N20 emissions(in CO2e)are less than 1%Df 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;l/www.energysavers.govtyour_home/water_heatingfindex.ctVmytopic=13170). ENVIRON conservatively assumed 90%efficiency for Mountain House pool heaters,resulting in a 121%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 naturak 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)!(80 deg F-55.5 deg F). Typical pool temperature based on information from the Department of Energy,available at;httpJAvww.energysavers.govlyour_homeAvater_heatingfindex.cknlmytopic=13300. Average ambient temperatures for Tracy and San Francisco-Richmond were obtained from the Western Regional Climate Center: http;/Avww.wrcc.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 M. 6.Emission factor for electricity is obtained from the California Climate Action Registry Database. The electricity generation emission factor was adjusted to reflect 20%of power provided by renewables(2010 RPS).See Table 3 for calculations.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. 8.Emissions for a single pool,assuming solar heating replaces all natural gas heating. This value now includes electricity from pumping only, Abbreviations: RPS-Renewables Portfolio Standard CO2-carbon dioxide CH4-methane ft-foot kWh-kilowatt-hour Ib-pound MM BTU-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:llwww.climateregistry.org/resources/docs/protocols/grp/GRP_3.1_January2O09.pdt California Climate Action Registry.2008.Database:Modesto Irrigation District 2007 PUP Report.Available at:https:llwww.climateregistry.org/CARROTIpublielReports.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:hitp:!lwww.energysavers.govlyour homehvater_heatingrndex.cfmlmytopic=13300 Determining Gas Swimming Pool Heater Energy Efficiency(September 2009).U.S.Department of Energy.Available at:http:/Mww.energysavers.gov/your_hometwater_heatinglndex.cfm/mytopic=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:/Awwwl.eere.energy.gov/buildings/appliance standardsteommercial/pdfs/ashrae—final_rule_030707.pdf