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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM 80 FCS Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx Additionally, the Prior FEIR identified Vulcan Materials Company (501 El Charro Road, Pleasanton, 94588), located approximately 1.5 miles east of the project site, as a potential odor producer. Public records retrieved from the Bay Area Air District show that one odor complaint was made in August 2025, and the Bay Area Air District reporting inspector subsequently informed Vulcan Materials Company of this complaint. However, an updated public records request conducted in April 2026 (the latest available at the time of writing) indicates that no additional odor complaints had been filed for Vulcan Materials Company since then. Based on the odor guidelines by the Bay Area Air District, odor impacts would be significant if more than five confirmed odor complaints are received for a facility or location per year, averaged over the past three years. Therefore, Vulcan Materials Company currently does not present a significant odor impact to nearby sensitive receptors. Should Vulcan Materials Company cause any nuisance for future residents, Vulcan Materials Company would be required to comply with the Bay Area Air District Regulation 1 Rule 301 (odorous emissions) and implement applicable control measures to reduce the odor impacts. Based on the absence of documented complaints and the regional wind conditions, substantial odor impacts on future residents are not anticipated, and impacts would be less than significant. In summary, consistent with the Prior FEIR’s conclusions, construction and operation of the proposed project would not result in emissions adversely affecting a substantial number of people; impacts would be less than significant. Therefore, the proposed project would not introduce new significant impacts or create substantially more severe significant impacts than those previously identified in the Prior FEIR. No additional analysis is required. Zone 7 Stormwater Option The Zone 7 Stormwater Option would not result in any new or more severe air quality impacts since it was previously considered in the Prior FEIR. The configuration would eliminate the need for construction and operation of the detention basin, pump facilities, and storm drain force main, thereby incrementally reducing construction-related equipment use and associated emissions; however, all mitigation measures would remain applicable to the proposed project. Consistent with the evaluation in the Prior FEIR, operation of the Zone 7 Stormwater Option would not generate new stationary or mobile sources of air emissions. Accordingly, air quality impacts would remain less than significant and consistent with the conclusions of the Prior FEIR. Mitigation Measures MM AIR-1 Implement Bay Area Air District Best Management Practices to Control Dust During Construction The following dust control measures, as recommended by the Bay Area Air Quality Management District (Bay Area Air District), shall be included in the design of the proposed project and implemented during construction: