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SAN LEANDRO SHORELINE DEVELOPMENT EIR ADDENDUM PROJECT CITY OF SAN LEANDRO May 2022 Page 49 Traffic-Related Noise In the Certified EIR for the Original Project, operational traffic noise was found to be significant and unavoidable. Marina Boulevard west of Aurora Drive would experience a noise increase greater than 3 dBA Ldn for all three traffic scenarios due to Original Project traffic and the resulting ambient noise level would be greater than 60 dBA Ldn, exceeding the City’s exterior noise level for residential uses. The transportation analysis in the First Addendum found that revisions to the Original Project would result in a net decrease of 538 project-related daily trips compared to the Original Project. Furthermore, Mitigation Measure NOISE-3, which includes measures to minimize an increase in ambient noise levels in the vicinity of the project site above levels existing without the project, would be implemented for the Modified Project, as with the Approved Project. Therefore, the Modified Project, which would not result in a net increase of 6 housing units. would not result in a new impact or a substantial increase in magnitude of the Approved Project’s impacts from traffic-related noise in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies. Stationary Noise In the Certified EIR for the Original Project, and in the First Addendum, stationary noise impacts associated with HVAC systems, proposed outdoor activities and events associated with the hotel, landscaping, maintenance, and recreational activities were found not to exceed the City’s noise standards. Noise from outdoor activities would be regulated by Chapter 4-1 of the City’s Municipal Code. Stationary noise sources such as those related to outdoor amenities and mechanical equipment (e.g., HVAC) associated with the relocated hotel would be approximately 500 feet from the nearest existing sensitive receptors (residences). At this distance, noise from HVAC or outdoor conversations associated with outdoor hotel amenities would attenuate to levels below the existing noise environment and remain less than significant. Therefore, the Modified Project would not result in a new impact or a substantial increase in magnitude of the Approved Projects impacts from stationary noise in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies. NOISE-b. The Certified EIR for the Original Project found that short-term construction vibration impacts were significant and unavoidable. These short-term construction vibration impacts were identified to potentially cause architectural damage if construction techniques such as pile driving, rock blasting and the use of vibratory rollers occurred in close proximity to existing buildings and structures. Even after implementation of Mitigation Measure NOISE-2, which includes measures to avoid excessive groundborne vibration or groundborne noise levels vibration, impacts were found to remain significant and unavoidable. The First Addendum found that changes to the Original Project would not result in a significant change in construction equipment mix. The Certified EIR analyzed impacts due to potential pile driving, rock blasting and vibratory rollers within close proximity of surrounding sensitive receptors. Since the overall project construction boundary has not changed and no new types of developments are being proposed under the Modified Project, the Modified Project would not result in new significant impacts. Impacts would be similar to those analyzed in the Certified EIR and the requirement of Mitigation Measure NOISE-2 would remain.