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b. Result in a cumulatively considerable net increase of any criteria pollutant for which the <br />project region is non -attainment under an applicable federal or state ambient air quality <br />standard? <br />Less Than Significant Impact. <br />Construction <br />A cumulatively considerable net increase would occur if the project's construction impacts substantially <br />contribute to air quality violations when considering other projects that may undertake construction <br />activities at the same time. Individual projects that generate emissions that do not exceed SCAQMD's <br />significance thresholds would not contribute considerably to any potential cumulative impact. SCAQMD <br />neither recommends quantified analyses of the emissions generated by a set of cumulative development <br />projects nor provides thresholds of significance to assess the impacts associated with these emissions.35 <br />Construction -related emissions were estimated using the SCAQMD's CalEEMod 2022.1.1.14 model and <br />a projected construction schedule of at least 36 months. Table 5 summarizes the estimated construction <br />schedule that was modeled for air quality impacts. <br />Table 6 <br />Construction Schedule Assumptions <br />Phase <br />Duration <br />Notes <br />Removal of 6,000 tons of demolition debris in 10-cubic yard <br />Demolition <br />Months 1-2 <br />capacity trucks, hauled up to 20 miles to the Olinda Alpha <br />Landfill. <br />Site Preparation <br />Month 3 (one <br />Grubbing and removal of trees, plants, landscaping, weeds <br />week) <br />over a 64,000 square -foot area <br />Grading <br />Months 3-5 <br />Approximately 400 cubic yards of soil hauled 20 miles to <br />Olinda Alpha Landfill in 14-cubic yard capacity trucks. <br />Trenching <br />Months 6-8 <br />Trenching for utilities, including gas, water, electricity, and <br />telecommunications. <br />Paving <br />Months 9-11 <br />Flatwork, including paving of driveways and walkways <br />Footings and foundation work (e.g., pouring concrete pads), <br />Building Construction <br />Months 12- <br />framing, welding; installing mechanical, electrical, and <br />36 <br />plumbing. Floor assembly, cabinetry and carpentry, elevator <br />installations, low voltage systems, trash management. <br />Architectural Coatings <br />Months 33- <br />Application of interior and exterior coatings and sealants. <br />36 <br />Source: DKA Planning, 2023. <br />35 South Coast Air Quality Management District, 2003 White Paper on Potential Control Strategies to Address <br />Cumulative Impacts from Air Pollution: "As Lead Agency, the AQMD uses the same significance thresholds for <br />project specific and cumulative impacts for all environmental topics analyzed in an Environmental Assessment <br />or EIR... Projects that exceed the project -specific significance threshold are considered by the SCAQMD to be <br />cumulatively considerable. This is the reason project -specific and cumulative thresholds are the same. <br />Conversely, projects that do not exceed the project -specific thresholds are not considered to be cumulatively <br />significant. <br />Cabrillo Town Center Project PAGE 26 City of Santa Ana <br />Air Quality Ivtour C 18 — 672 10/3/20233U1y2o23 <br />