Item 09 - Fairview Street Improvement Project

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Analysis Supporting Categorical Exemption Construction-generated emissions associated the Proposed Project are calculated using the CARB- approved CalEEMod computer program,which is designed to model emissions for land use development projects, based on typical construction requirements. Predicted maximum daily con struction-generated emissions for the Proposed Project are summarized in Table 3. Construction-generated emissions are short-term and of temporary duration, lasting only as long as construction activities occur, but are considered a significant air quality impact if the volume of pollutants generated exceeds the SCAQMD's thresholds of significance. Table 3. Construction-Related Emissions (Regional Significance Analysis) Pollutant (pounds per day) Construction Year ROG NOx CO S02 PM10 PM2.5 Construction Calendar Year One 3.84 33.00 39.20 0.07 5.77 1.89 Construction Calendar Year Two 1.88 16.00 21.00 0.04 2.57 0.82 SCAQMD Regional Significance Threshold 75 700 550 750 750 55 Exceed SCAQMD Regional Threshold? No No No No No No Source:CaIEEMod version 2022.1. Refer to Attachment A for Model Data Outputs. Notes: Emissions taken from the season,summer or winter,with the highest outputs. As shown in Table 3, emissions generated during Project construction would not exceed the SCAQMD's regional thresholds of significance. Therefore, criteria pollutant emissions generated during Project construction would not result in a cumulatively considerable net increase of any criteria pollutant for which the Project region is nonattainment under an applicable federal or state ambient air quality standard, and no health effects from Project criteria pollutants would occur. Localized Construction Significance Analysis In order to identify localized,air toxic-related impacts to sensitive receptors, the SCAQMD recommends addressing LSTs for construction. LSTs were developed in response to SCAQMD Governing Boards' Environmental Justice Enhancement Initiative(1-4).The SCAQMD provided the Final Localized Significance Threshold Methodology(dated June 2003 [revised 2008]) for guidance.The LST methodology assists lead agencies in analyzing localized impacts associated with Project-specific level proposed projects. For this Project, the appropriate SRA for the localized significance thresholds is the Central Orange County, SRA 17. LSTs apply to CO, NO2, PMio, and PM2.5. As previously described, the SCAQMD has produced lookup tables for projectsthat disturb one,two and five acres.The Project spans approximately 4 acres. Thus, the LST threshold values for a five-acre site were used. ECORP Consulting, Inc. 9 January 2025 Fairview Street Widening Project 2024-088.03 9-21