_DEIR - Laserfiche WebLink

City of Pleasanton—Hidden Canyon Residences and Preserve Draft EIR Air Quality FirstCarbon Solutions 3.2-27 https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-02 Air Quality.docx Potential localized and regional impacts would result in exceedances of State or federal standards for NOX, ROG, particulate matter (PM10 and PM2.5), or CO. NOX emissions are of concern because of potential health impacts from exposure to NOX and ROG emissions during both construction and operation and as a precursor in the formation of airborne ozone. PM10 and PM2.5 are of concern during construction because of the potential to emit exhaust emissions from the operation of off- road construction equipment and fugitive dust during earth-disturbing activities (construction fugitive dust). CO emissions are of concern during project operation because operational CO hotspots are related to increases in on-road vehicle congestion and potential health effects. The cumulative analysis focuses on whether a specific project would result in cumulatively considerable emissions. According to Section 15064(h)(4) of the CEQA Guidelines, the existence of significant cumulative impacts caused by other projects alone does not constitute substantial evidence that the proposed project’s incremental effects would be cumulatively considerable. Rather, the determination of cumulative air quality impacts for construction and operational emissions is based on whether the proposed project would result in regional emissions that exceed the BAAQMD regional thresholds of significance for construction and operations on a project level. The significance thresholds represent the allowable quantity of emissions each project can generate without producing a cumulatively considerable contribution to regional air quality impacts. Therefore, a project that would not exceed the BAAQMD thresholds of significance on the project level also would not be considered to result in a cumulatively considerable contribution to these regional air quality impacts. Construction and operational emissions are discussed separately below. Construction During construction, fugitive dust would be generated from demolition, site grading, and other earthmoving activities. The majority of fugitive dust would remain localized and deposited near the project site; however, potential fugitive dust impacts exist unless control measures are implemented to reduce this source's emissions. Exhaust emissions would also be generated from the operation of the off-road construction equipment and on-road construction vehicles. Construction Fugitive Dust For a project to have a less than significant criteria air pollutant impact related to construction- related fugitive dust emissions, it must implement all of the BAAQMD basic BMPs listed in the Guidelines.26 MM AIR- would require that the proposed project include all construction BMPs as part of compliance with standard construction permits. Therefore, impacts related to fugitive dust would be less than significant. Construction Emissions: ROG, NOX, PM10, and PM2.5 Construction emissions were quantified and estimated using CalEEMod Version 2022.1 for a typical construction scenario for a land use project of this size. Estimated construction emissions are compared with the applicable thresholds of significance established by the BAAQMD to assess ROG, NOX, exhaust PM10, and exhaust PM2.5 construction emissions to determine significance for this impact. The following project characteristics and assumptions were utilized in the analysis: 26 Bay Area Air Quality Management District (BAAQMD). 2022. Project-Level Air Quality Impacts, Table 5 -2, California Environmental Quality Act Air Quality Guidelines.