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City of Pleasanton—Hidden Canyon Residences and Preserve Draft EIR Air Quality FirstCarbon Solutions 3.2-35 https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-02 Air Quality.docx Regarding Impact AIR-2, the determination of cumulative air quality impacts for construction and operational emissions is based on whether the proposed project would result in emissions that exceed the BAAQMD thresholds of significance for construction and operations on a project level. The thresholds of significance represent the allowable emissions each project can generate without generating 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. The proposed project does not exceed BAAQMD project-level thresholds of significance for construction and operational-related emissions of criteria air pollutants. Therefore, a less than significant cumulative impact would occur regarding Impact AIR-2. The geographic area of the cumulative analysis for Impact AIR-3 is consistent with BAAQMD recommendations. BAAQMD recommends that the analysis combine the risks and hazards from existing sources within 1,000 feet of the proposed project and compare combined risks against the BAAQMD cumulative thresholds. According to BAAQMD, the cumulative threshold addresses the potential that a project would have a cumulative significant impact if the aggregate total of all past, present, and foreseeable future sources within 1,000-foot radius results in an excess cancer risk level of more than 100 in 1 million; or a non-cancer HI greater than 10.0; or an annual average PM2.5 concentration greater than 0.8 micrograms per cubic meter. I-580 is within 630 feet of the proposed project boundary. According to the BAAQMD Mobile Source Screening Map, estimated health risks at the proposed project site are less than 5 in 1 million for cancer risks, less than 0.01 for PM2.5 concentrations, and less than 0.14 for chronic hazards. There are no other freeways, major roadways, rail lines or permitted stationary sources within 1,000 feet of the proposed project’s construction area or within 1,000 feet of the proposed project’s boundary (Appendix B). In addition, as stated above, the proposed project would not expose nearby sensitive receptors to substantial pollutant concentrations from construction or operation. Therefore, a less than significant cumulative impact would occur regarding Impact AIR-3. The geographic area in regard to Impact AIR-4 is a 2-mile radius around the proposed project site, as recommended by BAAQMD. A cumulative odor impact would occur if the odorous emissions from cumulative development became collectively noticeable to the community. As previously stated, the BAAQMD provides a list of recommended odor-generating facilities and single-family residential uses are not considered odor-generating uses. There are no odor-generating facilities in the relevant geographic scope and none of the cumulative projects include odor-generating uses. Therefore, cumulative impacts regarding Impact AIR-4 would be less than significant. Moreover, the proposed project would not introduce new sources of odors to nearby existing receptors and, therefore, would not contribute to a cumulatively considerable increase in odors. Level of Cumulative Significance Before Mitigation Less than significant impact. Cumulative Mitigation Measures None.