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*:/ : 11-1 h WA <br />Construction <br />Localized Construction Impacts <br />A project could expose sensitive receptors to elevated pollutant concentrations during construction activities if <br />it would cause or contribute significantly to elevated levels. Unlike the mass of construction emissions shown <br />in the regional emissions analysis in Table 2, Maximum Daily Regional Construction Emissions, which are described <br />in pounds per day (lbs/day), localized concentrations refer to an amount of pollutant in a volume of air (parts <br />per million or micrograms per square meter [ppm or µg/m3]) and can be correlated to potential health effects. <br />Localized significance thresholds (LSTs) are the amount of project -related emissions at which localized <br />concentrations (ppm or µg/m3) could exceed the AAQSs for criteria air pollutants for which the SoCAB is <br />designated nonattauunent. LSTs are based on the proposed project site size and distance to the nearest sensitive <br />receptor. Thresholds are based on the California AAQS, which are the most stringent AAQS, established to <br />provide a margin of safety in the protection of the public health and welfare. They are designed to protect <br />nearby sensitive receptors in source receptor areas (SRA)s most susceptible to further respiratory distress, such <br />as asthmatics, the elderly, very young children, people already weakened by other disease or illness, and persons <br />engaged in strenuous work or exercise. <br />Air pollutant emissions generated by construction activities are anticipated to cause temporary increases in air <br />pollutant concentrations. Table 3, Maximum Daily Onsite Locak.Zed Construction Emissions, shows the maximum <br />daily construction emissions (lbs/day) generated during onsite construction activities compared with the <br />SCAQMD's LSTs. As shown in the table, project related construction would not generate emissions that would <br />exceed the LSTs. Therefore, it does not have the potential to expose sensitive receptors to substantial pollutant <br />concentrations. Localized air quality impacts from construction activities would be less than significant. <br />Table 3 Maximum Daily Onsite Localized Construction Emissions <br />Source <br />Pollutants(lbslday)r,u <br />NO, <br />CO <br />PIV" <br />PMzs <br />Year 2019 - Grading <br />16 <br />7 <br />3 <br />2 <br />SCAQMD 1.09-acre LST <br />84 <br />506 <br />4 <br />3 <br />Exceeds LST? <br />No <br />No <br />No <br />No <br />Year 2019 - Building Construction <br />16 <br />13 <br />1 <br />1 <br />SGAQMD 1.00-acre LST <br />81 <br />485 <br />4 <br />3 <br />Exceeds LST? <br />No <br />No <br />No <br />No <br />Year 2019-2020 - Building Construction + Paving <br />25 <br />22 <br />1 <br />1 <br />SCAQMD 1.00-acre LST <br />81 <br />485 <br />4 <br />3 <br />Exceeds LST? <br />No <br />No <br />No <br />No <br />Source: CalEEMod Version 2016.3.2.; SCAQMD 2008 and SCAQMD 2011. <br />Notes: In aaxdancewith SCAQMD methodology, only onside stationarysouroes and mobile equipment oxurnng on the proposed project site are included in the <br />analysis. Construction NOx and CO LSTs are based on norrsensitive receptors within 82 feet (25 meters) in SRA 17. Construction PMro and PMzs LSTs are based <br />on sensitive receptors within 82 feet (25 meters) in SRA 17. <br />1 Quantification are based off park the Red Street Site to provide a maximum or %orst case" scenario of emissions produced. <br />2 Construction phasing is based on the preliminary information provided by the Applicant. Where specgc information regarding projectfelated construction activities <br />was not available, construction assumptions were based on CaIEEMod defaults, which are based on construction surveys conducted by SCAQMD of construction <br />equipment and phasing for can parable projects. <br />3 Includes implementation of fugitive dust control measures required by SCAQMD under Rule 403, including watering disturbed areas a minimum of two times per day, <br />75C-81 <br />