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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, PM10, 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 Project <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 Unmitigated <br />(lbs/day) SCAQMD <br />Threshold <br />ROG 28.39 55 <br />NOx 15.82 55 <br />CO 122.31 550 <br />PM 10 22.96 150 <br />S02 0.14 150 <br />PM 2.5 4.49 55 <br />C02 17,511,24 N/A <br />Hold-underline indicates exceedance of SCAQMD Threshold. <br />02/02/11 <br />16 <br />75B-124