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