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3. Environmental Checklist San Leandro Treatment Wetland IS/MND 3-55 February 2024 conditions. Therefore, given the existing background noise levels in the area and the estimated attenuated construction noise level at the nearest residences, construction noise associated with the Project would not exceed the City’s noise policies, and this impact would be less than significant. Following construction, the only permanent noise source that would be associated with the Project would be pumps to and from the nitrification system, which would generate insignificant noise at levels below ambient conditions at the closest residences. Therefore, long-term operation noise associated with the Project would not exceed the City’s noise policies, and this impact would be less than significant. Impact Designation: Less than Significant Impact. b) Generate excessive vibration or ground borne vibration. Vibration impacts from construction activities primarily occur as a result of large or impact equipment. The Proposed Project would not include blasting, drilling, or other activities typically associated with ground borne vibration or ground borne noise. Construction of the Proposed Project will result in a very minor increase in ground borne vibration or ground borne noise levels during specific activities, such as soil movement and placement within the Basin, and temporary vehicular access along Davis Street and within the WPCP. The temporary increase in ground borne vibration and noise levels associated with these periodic occurrences are not expected to be excessive, will be temporary in nature, and will cease upon completion of construction. Impact Designation: Less than Significant Impact. c) Noise impacts to airports. OAK airport is located immediately north of the Proposed Project site. Implementation of the Proposed Project will not change the exposure of staff at the WPCP to additional airport-related noise and is not expected to expose people residing or working in the Proposed Project area to excessive noise levels. Impact Designation: No Impact. Cumulative Impacts on Noise The WPCP is located in an area of San Leandro dominated by various industrial land uses and several streets in the Project vicinity are designated truck routes in the San Leandro General Plan.46 In support of the Oyster Bay Regional Shoreline Land Use Plan Amendment, EBRPD commissioned a noise study in 2013 to perform baseline monitoring and inform potential impacts associated with improvements to the Oyster Bay Regional Shoreline.47 Baseline measurements were collected near the Proposed Project and are believed to remain generally consistent under existing conditions. Along the designated truck routes near the Proposed Project, noise can range between 65-80 DNL (day-night average noise level).48 Waste Management and the San 46 City of San Leandro. 2016. San Leandro 2035 General Plan, Chapter 4: Transportation. Available at https://www.sanleandro.org/332/General-Plan 47 SCA Environmental, Inc. Noise Impact Assessment – East Bay Regional Park District – Oyster Bay Regional Park – San Leandro, CA. September 16, 2013. 48 East Bay Regional Park District. 2013. Initial Study and Mitigated Negative Declaration for the Oyster Bay Regional Shoreline Land Use Plan Amendment.