Laserfiche WebLink
NT <br />MENTS <br />INITIAL STNDV/MITIGATED NEGATIVE DECLARATION FAIRVIEW RPIOGE REVLACEM REST TO STREET BEET) PROJECT <br />L S A <br />MAY 2020 (9Tx STREET rGANTx NA, CAL,ORNIA <br />SANTA ANAL CALIFOPNIA <br />it normalizes various GHGs to the same metric. GHG emissions are typically measured in terms of <br />metric tons of CO2e. Therefore, for the purpose of this technical analysis, the concept of CO2e is <br />used to describe how much global climate change a given type and amount of GHG may cause, using <br />the functionally equivalent amount or concentration of CO2 as the reference. The GHG emissions <br />estimates were calculated using the Roadway Construction Emissions Model Version 9.0.0. In <br />addition, the Project's consistency with the City's adopted City Climate Action Plan (CAP)19 is <br />discussed below. <br />3.8.2 Impact Analysis <br />a. Would the project generate greenhouse gas emissions, either directly or indirectly, that may <br />have a significant impact on the environment? <br />Less Than Significant Impact. The following sections describe the proposed Project's construction - <br />and operation -related GHG impacts. <br />Construction GHG Emissions. GHG emissions associated with the proposed Project would occur <br />over the short term from construction activities, consisting primarily of emissions from <br />equipment and vehicle exhaust. The calculation presented below includes construction <br />emissions in terms of annual CO2e GHG emissions. <br />Construction activities produce combustion emissions from various sources such as <br />grubbing/land clearing, grading/excavation, drainage/utilities/subgrading, paving, construction <br />equipment hauling materials to and from the site, and motor vehicles transporting the <br />construction crew. Exhaust emissions from on -site construction activities would vary daily as <br />construction activity levels change. Table 3.8.A presents the annual construction emissions <br />based on the Roadway Construction Emissions Model emission estimates. Results indicate that <br />Project construction would generate approximately a total of 1,693.17 MT of CO2e. <br />Table 3.8.A: Project Construction Greenhouse Gas Emissions <br />Project Phase <br />CO2 <br />(tons/phase) <br />CH4 <br />(tons/phase) <br />N20 <br />(tons/phase) <br />CO2e <br />(tons/phase) <br />Grubbing/Land Clearing(lbs/day) <br />114.49 <br />0.03 <br />0.00 <br />105.22 <br />Grading/Excavation(lbs/day) <br />1,794.29 <br />0.53 <br />0.02 <br />1,645.73 <br />Drainage/Utilities/Subgrading <br />(Ibs/day) <br />1,302.57 <br />0.31 <br />0.02 <br />1,193.70 <br />Paving(lbs/day) <br />442.70 <br />0.10 <br />0.02 <br />409.16 <br />Maximum (tons/phase) <br />2,012.65 <br />0.56 <br />0.03 <br />1"8 34 <br />Total (tons/construction project) <br />3,654.05 <br />0.97 <br />0.06 <br />3,353.81 <br />Amortized Emissions <br />146.16 <br />0.04 <br />0.00 <br />134.15 <br />Source: Sacramento Metropolitan Air Quality Management District Road Construction Emissions Model (May 2018), compiled by LSA <br />(July 2018). <br />CH.,=methane CO2e= carbon dioxide equivalent MIT metric tons <br />COz=carbon dioxide Ibs/day=pounds per day WO nitrous oxide <br />19 City of Santa Ana. 2015. Final Climate Action Plan. December. <br />R:\WKE1702\ISMND\Fina1 ISMND\Fairview Street Bridge Final ISM N07,558l17 9 3-45 <br />