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MacArthur Project Modification — Santa Ana - Air Quality Assessment <br />KPC Environmental, Inc. <br />5.2 Construction Impacts <br />Construction emissions would be below the SCAQMD's significance thresholds for CO <br />ROG, NOx, PM 10, PM2.5 and SOx. With no exceedances of the significance thresholds <br />predicted emissions would be considered to have a less than significant adverse impact <br />during the construction phase of the project. Emissions levels however, can be further <br />lowered through implementation of mitigation measures found in this study. The highest <br />level of emissions from the project will be short -term and cease at the completion of the <br />construction of the project. <br />PM 10 and PM2.5 generated as a result of grading operations can be mitigated to the lowest <br />possible levels by adhering to SCAQMD Rules 402, 403, and 403.1 along with the <br />implementation of BMP's & mitigation measures recommended in this assessment. <br />5.3 Area and operational Emissions: <br />Data contained herein was obtained from default values for the modifications to the project <br />which included 300 mid -rise condominium units and parking structure using the <br />URBEMIS program and includes the calculated values for Area Emissions. The Area <br />Emissions Table 5 -5 includes emissions from the day -to -day operation and maintenance of <br />the facilities, consumer products usage, natural gas use, and landscaping equipment use. <br />URBEMIS default values were used for all proposed sites with no mitigation measures <br />employed in the model. <br />Traffic data was obtained from the Updated Main & MacArthur Development Proj ect <br />Traffic Impact Study dated December 2010 as completed by KOA Corporation. According <br />to the estimated emissions there will be no significant increase in criteria pollutants with <br />the proposed project as compared to the existing entitlement. Additionally, all criteria <br />pollutants are below the SCAQMD's significance thresholds. <br />Table 5-5 Area Emissions <br />Pollutant <br />Unmitigated <br />(lbslday) <br />SCAQMD <br />Threshold <br />RGG <br />28.39 <br />55 <br />NGx <br />15.82 <br />55 <br />Co <br />122.31 <br />550 <br />PM 10 <br />22.96 <br />150 <br />SGz <br />0.14 <br />150 <br />PM 2.5 <br />4.49 <br />55 <br />CO2 <br />17,511524 <br />NIA <br />Bold - underline indicates exceedance of SCAQMD Threshold. <br />02/02/11 16 <br />