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AUGUSTIN BERNAL MOUNTAIN BIKE TRAIL PROJECT DRAFT INITIAL STUDY Construction Noise The project site is surrounded by both residential and recreational land uses. The primary source of noise in the immediate vicinity is roadway noise along Golden Eagle Way.Construction activities could increase noise levels temporarily in the vicinity of the project. Actual noise levels would depend on the type of construction equipment involved, distance to the source of the noise,time of day,and similarfactors.Construction noise is complexto quantify because of the many variables involved, including the specific equipment types, size of equipment used, percentage of time, condition of each piece of equipment,and number of pieces of equipment that will actually operate on site.Although the anticipated construction noise levels would be readily noticeable to adjacent residences and park goers, construction noise would be regulated through Pleasanton City Code. Pursuant to Article 9.04 of the Pleasanton City Code, noise from construction activities is exempt from noise level requirements of the Code, provided that construction equipment is fitted with factory-installed muffling devices and is properly maintained and'that construction occurs during the following periods: • Monday through Saturday,8:00 a.m.to 8:00 p.m, • Sunday and holidays, 10:00 a.m.to 6:00 p.m. Construction activities for the project would occur between the permitted hours and would comply with other City Code requirements;thus construction noise would result in a less-than-significant impact. Operational Noise After construction,operational noise from the project site would consist of noise from vehicle trips associated with the project as well as on-site activities.On-site activities at the proposed park would result in relatively low noise levels. No public address or other amplified sound system would be installed as part of the project. Furthermore, no team sports fields or courts are proposed,and the trail would be closed between dawn and dusk. Therefore, operation of the project would have a less-than-significant impact. b) Would the project result in generation of excessive groundborne vibration or groundborne noise levels? Construction activities may expose persons to excessive groundborne vibration or groundborne noise, causing a potentially significant impact. Caltrans has collected groundborne vibration information related to construction activities(Caltrans 2020). Information from Caltrans indicates that continuous vibrations with a peak particle velocity of approximately 0.1 inches per second begin to cause annoyance. Heavier pieces of construction equipment, such as bulldozers, have peak particle velocities of approximately 0.089 inches per second or less at a distance of 25 feet (FTA 2018). Groundborne vibration typically attenuates over short distances. Construction can also affect nearby buildings by inflicting damage from vibration. However, construction vibration associated with this project would not result in structural building damage. Building damage typically occurs 12956 DUDEK 72 April 2022