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City of Santa Ana Addendum to the <br />MainPlace Mall Transformation Proiect Fashion Square Commercial Center Final EIR <br />risk would be 5.98 per million for 70-year exposure, 5.04 per million for 30-year <br />exposure, and 3.62 per million for 9-year exposure, which are less than the threshold of <br />10 per million. Therefore, impacts related to toxic air contaminates would be less than <br />significant. <br />Table AQ-4: Health Risk Assessment Results <br />Maximum Cancer Risk <br />(Risk per Million) <br />Significance <br />Threshold <br />(Risk per <br />Million) <br />Exceeds <br />Significance <br />Threshold? <br />Floor <br />70-Year <br />Exposure <br />30-Year <br />Exposure <br />9-Year <br />Exposure <br />1 <br />5.98 <br />5.04 <br />3.62 <br />10 <br />No <br />2 <br />5.41 <br />4.55 <br />3.27 <br />10 <br />No <br />3 <br />4.27 <br />3.60 <br />2.59 <br />10 <br />No <br />4 <br />2.92 <br />2.46 <br />1.77 <br />10 <br />No <br />5 <br />7.56 <br />6.36 <br />4.57 <br />10 <br />No <br />Source: Health Risk Assessment, 2019 <br />Greenhouse Gas Emissions <br />The SCAQMD Greenhouse Gas (GHG) CEQA Significance Threshold Working Group <br />identified different GHG threshold options for different types of projects. This includes <br />numeric "bright -line" thresholds and efficiency metric thresholds to meet the State's <br />GHG emissions targets. The efficiency -based threshold is 3.0 MTCO2e per service <br />population per year, which would meet the State's 2035 GHG reduction target (GHG <br />2019). <br />Construction of the proposed Project would include development of an additional <br />270,000 square feet of commercial, 750,000 square feet of office, 400 hotel rooms, and <br />1,900 residential units. Earthwork would involve the export of 440,000 cubic yards of <br />soil for parking structures and the import of 200,000 cubic yards of soil for minor grade <br />adjustments. Demolition of existing parking lot pavement, parking structures, and other <br />existing structures would also occur. Pursuant to SCAQMD guidance, construction GHG <br />emissions are summed and amortized over the lifetime of the project (assumed to be 30 <br />years), then added to the operational emissions. The amortized Project construction <br />emissions would be 62 MTCO2e per year. <br />GHG emissions would also occur from operation of the Project due to vehicular traffic <br />(mobile emissions), on -site combustion of natural gas, and operation of any landscaping <br />equipment. Operational GHG emissions also result from offsite generation of electrical <br />power, the energy required to convey water to, and wastewater from the Project site, <br />the emissions associated with solid waste generated from the Project, and any fugitive <br />refrigerants from air conditioning or refrigerators. The GHG emissions that are <br />estimated to occur from the existing development on the site, the Originally Approved <br />Plan, and the proposed Project are provided in Table AQ-5. <br />118 <br />