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+RNVIYONMENTAL IMPACT REPORT ADDENDUM ARMSTIUNU RANU11 RRVIIRn PROJRu`T <br />�9e PTBMBRR 4,17 SANTA ANA. UALIPORNIA <br />2.7 <br />GWEENHOUSE GAS FA-USSIONS <br />uu.r <br />Alam_ <br />NosulmantW <br />I v6ldd tile project: <br />.\IRninuml <br />hNPael <br />Stwe- <br />Impact <br />'Chan-efrom <br />P inuplfnnl}au <br />(aj <br />CiCllhra[L gn:enitoase. gas zniissinn-Ieuliecdnectly'or in direclty, <br />El <br />11 <br />0 <br />dint ma have a'steiiificSnt im laLt on the' environment? <br />(b)- <br />Conflict with an applicable plan, policy or regulation adopted <br />11 <br />El- <br />for the nurnus nfreducinn the emissinnc of ereenliame aNsuv? <br />Analysis of ProjectChanges: <br />a) The emission of geeenhousegases,(GHG) was nut an issue identified and analyzed in the certified <br />Armstrong Ranch Final EIR: The CEQ k guidelines were updated in March 2010 to require <br />analysis ofclitnate change in C1EQA documents. However, at the.time ofthe Final' EIR. <br />certification, G[IG emissions had been recognized as an etiviromnental'issuc since the 1970s <br />when the United Stares Congress enacted the National Climate Program Act (92 Sllx1.601, 1978), <br />which required the President to establish a program to assist in understanding and tvsponding to <br />natural and human -induced climate processes, and since the 1980s when the intergovernmental <br />Panel on Climate Change (IPC C)'�yx's formed to.assess scientific information related tclimate <br />change. 'Thus, issues related to dimatc change were knoNrit„or`could have been known -,at the - <br />time of the certificalion oClhc Armstrong Ranch Final EIR, <br />Project -related GHG emissions would include emissions from direct and indirect sources. The <br />Revised Project would result in dircctand ndirect emissions of carbon dioxide (CO,), nitrous <br />oxide (NO), acid methane (CH;):Direct Project -related CHIC] emissions include emission from <br />construction activities, area sources, and mobile sources, while indirect sources include::missions <br />from electricity consuniption,,vwater demand, and solid waste generation. Operational GIiG <br />emissions are primarily based oil: cncrgy cinissiotrs from natural _gas usage and automobile <br />emissions. SCAQMD has prepared recommended significance thiesholds for GHGs for local <br />Lead Agency consideration of 3,000 metric tons per year. <br />Impacts associated with the emission of GIiGs would be similar to those that would have <br />occurred under [he Certified BiR Project; however, supplemental analysis of the Remised Project <br />is provided below for inrormational purposes, <br />Construction GHG Emission's. Construction and operation. of the Revised Project would <br />generate GHG omissions, with the majority of energy consumption (and associated generation of <br />GHG emissions) occurring during the Project's operation (as opposed to its construction). <br />Constmction activities produce coathustion emissions from various sources (e.g., site grading, <br />utility engines; heavy-duty 6onstruction vehicles oil site,.equipment hauling materihls to and from <br />the site, asphalt paying, and motor vehicles transporting the construction crew). Exhaust <br />emissions from on-site construction activities would vary daily as construction activity levels <br />change. GHG tmissions associated with consnuction of the proposed Project would occur over <br />the short -tern. LSA calculated GI -IG emissions associated with construction and operation of the <br />project using the California Emissions Estiniatorhlodel (CaIEF.Mod). Calculations for GHG <br />PA: 1101604%AddcndumUddcnduntd ka 09NI'l7x+ <br />75B-84 <br />2-35 <br />