Draft Environmental Impact Report - East Bay Municipal Utility District

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Estates Reservoir Replacement Draft Environmental Impact ReportGreenhouse GasesCurrent research suggests that another constituent of aerosols, elemental carbon, mayhave a positive radiative forcing. The primary anthropogenic emission sources ofelemental carbon include diesel exhaust, coal combustion, and biomass burning.Global Warming Potential - GWP is intended as a quantified measure of the globallyaveraged relative radiative forcing impacts of a particular GHG. It is defined as thecumulative radiative forcing both direct and indirect effects integrated over a period of timefrom the emission of a unit mass of gas relative to some reference gas (USEPA 2008).Carbon dioxide (CO 2 ) is the reference gas.The GWP values shown in Table 3.8-3 and Table 3.8-4 allow comparisons of theimpacts of emissions and reductions of different gases.Greenhouse gases with relatively long atmospheric lifetimes (e.g., CO 2 , CH 4 , N 2 O, HFCs,PFCs, and SF 6 ) tend to be evenly distributed throughout the atmosphere; and,consequently, global average concentrations can be determined. However, it is difficultto quantify global radiative forcing impacts for the short-lived gases such as water vapor,carbon monoxide, tropospheric ozone, other ambient air pollutants and troposphericaerosols. GWP values are generally not attributed to these gases that are short-lived andspatially inhomogeneous in the atmosphere. (USEPA 2008)Regulatory BackgroundGlobal Warming Solutions Act (AB 32)The Global Warming Solutions Act of 2006 (AB 32) codifies California’s goal ofreducing statewide emissions of greenhouse gases to 1990 levels by 2020. This reductionwill be accomplished through an enforceable statewide cap on global warming emissionsthat will be phased in starting in 2012 to achieve maximum technologically feasible andcost-effective GHG emission reductions. In order to effectively implement the cap, AB32 directs the Air Resources Board (ARB) to develop appropriate regulations andestablish a mandatory reporting system to track and monitor global warming emissionslevels.While AB 32 does not amend CEQA to require new analytic processes to account for theenvironmental impacts of GHG emissions from project subject to CEQA, it doesacknowledge that such emissions cause significant adverse impacts to the environment.sb09_001.doc 3-8.6 7/22/2009
Greenhouse GasEstates Reservoir Replacement Draft Environmental Impact ReportGreenhouse GasesTABLE 3.8-3100-Year Global Warming Potentials ofGreenhouse GasesLifetimeYearsGWP100-YearCarbon Dioxide (CO 2 ) 50-200 1Methane (CH 4 ) 9-15 21Nitrous Oxide (N 2 O) 120 310HFC-23 264 11,700HFC-125 33 2,800HFC-134a 15 1,300HFC-143a 48 3,800HFC-152a 2 140HFC-227ea 37 2,900HFC-236fa 209 6,300HFC-4310mee 17 1,300Fluoromethane (CF 4 ) 50,000 6,500Fluoroethane (C 2 F 6 ) 10,000 9,200Fluorobutane (C 4 F 10 ) 2,600 7,000Fluorohexane (C 6 F 14 ) 3,200 7,400Sulfur Hexafluoride (SF 6 ) 3,200 23,900Source: USEPA 2008TABLE 3.8-4100-Year Global Warming Potentials ofOzone DepletersDirectNet EffectOzone Depleter100-Year min maxCFC-11 4,600 (600) 3,600CFC-12 10,600 7,300 9,900CFC-113 6,000 2,200 5,200HCFC-22 1,700 1,400 1,700HCFC-123 120 20 100HCFC-124 620 480 590HCFC-141b 700 (5) 570HCFC-142b 2,400 1,900 2,300Trichloromethane (CHCl 3 ) 140 (560) 0Carbon Tetrachloride (CCl 4 ) 1,800 (3,900) 660Methyl Bromide (CH 3 Br) 5 (2,600) (500)Halon-1211 1,300 (24,000) (3,600)Halon-1301 6,900 (76,000) (9,300)Source: USEPA 2008sb09_001.doc 3-8.7 7/22/2009
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Estates Reservoir ReplacementDraft
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TABLE OF CONTENTSEstates Reservoir
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Estates Reservoir Replacement Draft
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ACRONYMS AND ABBREVIATIONSABABAGAPC
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SUMMARYS.1 IntroductionThis Draft E
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Estates Reservoir Improvements Draf
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Chapter 2Project Description2.1 Ove
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Chapter 3Environmental Setting, Imp
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3.5 Cultural Resources3.5.1 Approac
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CHAPTER 6Report Preparers6.1 Lead A
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APPENDIX APublic InvolvementPublic
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APPENDIX BNotice of PreparationAUGU
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Dingee Pressure Zone Improvement Pr
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FIGURESDingee Pressure Zone Improve
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Draft Environmental Impact Report - East Bay Municipal Utility District

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