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SANTA ANA REZONE PROJECT <br />INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br />b) Result in a cumulatively considerable net increase of any criteria pollutant for which <br />the project region is nonattainment under an applicable federal or State ambient air <br />quality standard? <br />Less than significant impact. The SCAQMD's thresholds of significance represent the allowable <br />amount of emissions a project can generate without generating a cumulatively considerable <br />contribution to regional air quality impacts. Therefore, a project that would not exceed the SCAQMD <br />thresholds of significance on a project level also would not be considered to result in a cumulatively <br />considerable contribution to these regional air quality impacts. The region is nonattainment for the <br />federal and State ozone standards, nonattainment for the federal and State PM2.5 standards, and <br />nonattainment for State PM,o standards. Impacts related to construction and operations of the <br />proposed project are addressed separately below. <br />Construction Emissions <br />Emissions from construction -related activities are generally short-term in duration but may still cause <br />adverse air quality impacts. The proposed project would generate emissions from construction <br />equipment exhaust, vehicle and truck travel, and fugitive dust. These construction emissions include <br />criteria air pollutants and precursors from the operation of heavy construction equipment. <br />Construction Fugitive Dust <br />The SCAQMD requires all development projects to implement Rule 403—Fugitive Dust in order to <br />ensure that construction -related fugitive dust emissions are considered less than significant. <br />Compliance with this rule is achieved through the application of BACMs. For example, some BACMs <br />that would be required include watering active construction sites three times daily, applying nontoxic <br />chemical soil stabilizers to inactive construction areas, and suspending all grading activities when <br />wind speeds exceed 25 miles per hour (mph). These required measures would help to reduce <br />potential fugitive dust emissions associated with construction activities for the proposed project. <br />Construction emissions were estimated for the activities associated with removal of existing ground <br />materials, site preparation, grading, trenching, installation of the EV charging stations and solar panel <br />structures, and paving. Based on City -provided information, it is expected that construction of the <br />proposed project would be completed in three months (January —March 2027). The construction <br />schedule and off -road construction equipment list can be found in Appendix A. The exhaust emissions <br />generated by construction equipment are based on the hours of operation, horsepower, and load <br />factors of the equipment. The duration of construction activity and associated equipment represent a <br />reasonable approximation of the expected construction fleet as required by CEQA Guidelines. <br />The proposed project's maximum daily construction emissions are shown and compared with the <br />significance thresholds in Table 1. <br />30 FCS <br />Https://adecinnovaticns.sharepoint.com/sites/PubiicationsSite/Shared Documents/Publications/Client(PN-JN)/0327/03270047/ISMND/03270047 Santa Ana Rezone Project ISMND.docx <br />