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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM FCS 79 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx Bay Area Air District Regulation 1, Rule 301 and Regulation 7 govern odorous emissions and public nuisance thresholds. Although the County Project’s WWTP could be a potential source of odors, the Prior FEIR determined that it would include odor control systems. The Bay Area Air District’s odor screening thresholds were applied, and the County Project was found to be outside the screening- level distances for odor-generating facilities. The Prior FEIR determined that the County Project was not expected to generate odors that would affect a substantial number of people, and no mitigation was deemed necessary. Any potential odor impacts would be further reduced under Alternative 2 because the WWTP and related facilities would not be built. (Draft EIR, pp. 6-12–6-13). Therefore, the Prior FEIR concluded that construction- and operation-related impacts would be less than significant. (Draft EIR, pp. 3.2-56, 6-12, 6-13). Proposed Project Analysis and Conclusion Consistent with the analysis in the Prior FEIR, during construction activities, construction equipment exhaust and application of asphalt and architectural coatings would temporarily generate odors. Any construction-related odor emissions would be temporary and intermittent. Additionally, any such noxious odors would be confined to the immediate vicinity of the construction equipment. It is anticipated that by the time such emissions reach any sensitive receptor sites, they would be diluted to well below any air quality or odor concern level. Therefore, consistent with the Prior FEIR’s impact conclusions, construction odor impacts would be less than significant. Land uses typically associated with objectionable odors include WWTPs, compost facilities, landfills, solid waste transfer stations, fiberglass manufacturing facilities, paint/coating operations (e.g., auto body shops), dairy farms, petroleum refineries, asphalt batch plants, chemical manufacturing, and food manufacturing facilities, as shown in the 2022 Bay Area Air District CEQA Guidelines. The proposed project would involve the development of residences whose operations could lead to typical odors from associated laundry cleaning, vehicle exhaust, outdoor cooking, and waste disposal. However, such odors generated by project operation would be small in quantity and duration and would not pose an objectionable odor impact to future and existing receptors. The Prior FEIR identified the WWTP included under the County Project as an additional potential odor source, although it confirmed that this would not result in a significant impact. The Prior FEIR also evaluated Alternative 2, which would not include the off-site utility improvements. Similar to Alternative 2, the proposed project would not include the WWTP, removing it as a potential odor source. The proposed project is located approximately 160 feet northwest of Pleasanton Garbage Services Inc., which is a transfer station. CEQA does not require analysis of the environment’s impact on a proposed project (i.e., whether the existing transfer station would subject the new residents to odor or other effects). However, public records from the Bay Area Air District indicate that no confirmed odor complaints have been filed against the facility in the past five years, suggesting a low likelihood of nuisance-level emissions. Additionally, meteorological data from the nearest Bay Area Air District monitoring station in Livermore shows that prevailing winds in the area typically blow from west to east. Given that the project site is located northwest of the transfer station, prevailing wind patterns would generally carry odors away from the proposed development.