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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR <br />CITY OF SANTA ANA <br />5. Environmental Analysis <br />NOISE <br />interruption /masking, sleep disturbance, disturbance of concentration) and cause annoyance. Table 5 -9 -2 <br />shows Typical Noise LemLr from Noise Sources. <br />Table 5.9 -2 Tvoical Noise Levels from Noise Sources <br />Common Outdoor Activities <br />Noise Level <br />(dBA) <br />Common Indoor Activities <br />110 <br />Rack Band <br />Jet Flyover at 1,000 feet <br />100 <br />Gas Lawn Mower at three feet <br />90 <br />Diesel Truck at 50 feet, at 50 mph <br />Food Blender at 3 feet <br />80 <br />Garbage Disposal at 3 feet <br />Noisy Urban Area, Daytime <br />70 <br />Vacuum Cleaner at 10 feet <br />Commercial Area <br />Normal speech at 3 feet <br />Heavy Traffic at 300 feet <br />60 <br />Large Business Office <br />Quiet Urban Daytime <br />50 <br />Dishwasher Next Room <br />Quiet Urban Nighttime <br />40 <br />Theater, Large Conference Room (background) <br />Quiet Suburban Nighttime <br />30 <br />Library <br />Quiet Rural Nighttime <br />Bedroom at Night, Concert Hall (background) <br />20 <br />Broadcast/Recording Studio <br />10 <br />Lowest Threshold of Human Heading <br />0 <br />Lowest Threshold of Human Heading <br />Soumz: California Department of Transpodation. Technical Noise Supplement <br />2009. <br />Vibration Fundamentals <br />Vibration is an oscillatory motion through a solid medium in which the motion's amplitude can be described <br />in terms of displacement, velocity, or acceleration. Vibration is normally associated with activities such as <br />railroads or vibration intensive stationary sources, but can also be associated with construction equipment <br />such as jackhammers, pile drivers, and hydraulic hammers. Vibration displacement is the distance that a point <br />on a surface moves away from its original static position. The instantaneous speed that a point on a surface <br />moves is the velocity, and the rate of change of the speed is the acceleration. Each of these descriptors can <br />be used to correlate vibration to human response, building damage, and acceptable equipment vibration <br />levels. During project construction, the operation of construction equipment can cause groundborne <br />vibration. During the operational phase of a project, receptors may be subject to levels of vibration that can <br />October 2014 Page 5.9 -3 <br />