Item 28 - Public Hearing - ZOA No. 20204-01 South Coast Technology Center

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South Coast Technology Center Project CEQA Exemption 15183 controls to be used to contain the asbestos emissions, estimates on the amount of asbestos to be removed, the name of the waste disposal site where the asbestos will be taken, and names and addresses of all contractors and transporters that will be involved in the asbestos removal process. Therefore, through adherence to the asbestos removal requirements, detailed in SCAQMD Rule 1403, a less than significant asbestos impact would occur during construction of the proposed Project. Operations According to SCAQMD LST methodology, LSTs would apply to the operational phase of a proposed project if the project includes stationary sources or attracts mobile sources that may spend extended periods queuing and idling at the site (e.g., warehouse or transfer facilities). Since the proposed Project consists of three new Class A industrial buildings for office, manufacturing, and/or warehouse use, the operational phase LST protocol was applied. If emissions exceed the applicable operational LST screening thresholds for the Project Site, then additional dispersion modeling would need to be conducted to determine if there is an actual exceedance of the ambient air quality standards. The Project Site is approximately 15.8 acres. Therefore, the LST values for five -acre at 25 meters were utilized to provide a conservative estimate of operational LST impacts. It is assumed that the maximum distance a vehicle could travel on the 15.8-acre (approximately 0.0247-square mile) site would be one mile or less. Therefore, a conservative percentage of 20 percent of the total mobile source emissions (one mile trip on -site of the shortest 5.3-mile trip) were assumed as on -site emissions. This assumption is conservative because only 45 percent of the passenger cars trips would have a trip length of 5.3 miles per trip; all other trip types and vehicle types would have much longer trip lengths. Table 4.3-4, Localized Significance of Operational Emissions, shows the calculated emissions for the Project's operational activities compared to the applicable LST screening thresholds. As shown in Table 4.3-4, the Project's operational area source emissions would not exceed the LST screening thresholds for SRA 17. Therefore, localized significance impacts from operations would be less than significant. Further, based on the Health Risk Assessment, the highest expected annual average DPM emission concentrations resulting from operation of the Project (332 daily truck trips) at a sensitive receptor would be 0.00456 micrograms per cubic meter (pg/m3). This level of concentration would be experienced at the institutional uses (Calvary Chapel High School) located directly east of the Project Site, where DPM emissions were modeled to include emissions from on -site and off -site heavy duty trucks movement and idling. It is acknowledged that the calculations conservatively assume no cleaner technology with lower emissions would occur in future years. Cancer risk calculations are based on four-year maximum individual cancer risk (MICR) exposure periods. As shown in the Health Risk Assessment, the highest calculated carcinogenic risk from Project implementation is 0.00965 per million for 4-year exposure at the sensitive receptor at the school. The highest calculated carcinogenic risk at a residential sensitive receptor location (800 feet south of the Project Site) is 1.750 per million for 30-year exposure. Thus, the Project would not exceed the MICR of 10 in one million and impacts related to cancer risk and DPM concentrations from heavy trucks would be less than significant for the MICR. July 2024 Page 29