2009-034 (2) - Final Supplemental Environmental Impact Report for Fairhaven/Lincoln

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5. Environmental Analysis NoiSE the workday and would primarily occur during non peak traffic periods. Therefore, these ire acts are less than significant at noise receptors. � Noise is also generated by on -site construction operations. During construction nearby esidents would be subject to elevated noise levels. Construction activities are carried out in di y crate stags, each of which has its oven mix of equipment and, consequently, its own noise characteristics. These various sequential phases world change the character of the noise levels surrounding the construction site as cork progresses. Typically, the estimated construction noise levels are governed primarily by equipment that produces the highest noise levels. Construction nose levels for each generalized construction phase round clearing /demolition, excavation, roadway construction. finishing, and site clean 9 ups are based on a typical construction equipment mix and do not include use of atypical, very loud, and vibration - intensive equipment such as pile drivers. Pile drivers and other very loud construction equipment would not be required for construction of the minor roadway improvements. Estimated construction noise levels are shown in Table 5.2-9 and would range between 79 and 88 d A. However, noise attenuation provided by intervening masonry walls wouId range from 5 to 8 dBA depending on whether or not the barriers have gaps in it that reduce their effectiveness FHVA 2006). Table .: Construction Noise Levels at Noise-Sensitive Uses � of Construction Phase Noise Levels of 50 Feel Ground cleadn Demolition 84 Excavation 79 Foundation construction (concrete trucks) Building Construction Finishing and Site Cleanup 84 Source: Bolt, Beranek and Newman 1 976. Note; Noise levels frorn construction activities do not take into account attenuation provided by masonry walls and assumes minimum equipment in use due to the limited nature of construction activities. Construction activities would occur between 7;00 AM and 8:00 PM, Monday through Friday, with some nighttime and weekend work up to two weekends) to avoid disruption of train schedules. Construction activities are forecast to take approximately 12 weeks weeks at each intersection). Construction activities that occur during the daytime would comply with the City noise ordinance and would not resuit in significant noise impacts. During the evening ambient noise is less, people are sleeping and more sensitive to noise disturbances. Construction activities that occur between 8.00 PI VI and 7:00 AM would not comply with the noise ordinance. Because disruption of train schedules is not permitted, and most trains run during the day, project- related construction work would be conducted up to four nights between 11:00 PI VI and 5:00 AM for signal construction at the Santa Clara/Lincoln intersection. This phase of construction would use excavators, concrete trucks, and pick -ups. use of construction equipment would typically disrupt a quiet nighttime noise environment and potentially result in sleep disturbance. However, the nighttime ambient noise environment along Lincoln Avenue is comprised of both traffic noise and train noise, The nighttime ambient noise Page 5,2- 1 * The Planning Venter Resolution No. 2009 -034 Page 76 of 130 March 2009