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<br />Legacy Sunflower Apartments Page 86 <br />Mitigated Negative Declaration – March 14, 2019 <br /> <br />Table 23 <br />Construction Equipment Vibration Source Levels <br /> <br />Equipment <br />Peak Particle Velocity in inches per second2 <br />at 25 feet at 50 feet at 100 feet <br />Clam Shovel Drop (slurry <br />wall) 0.202 0.071 0.025 <br />Vibratory Roller 0.210 0.074 0.026 <br />Hoe Ram 0.089 0.031 0.011 <br />Large Bulldozer 0.089 0.031 0.011 <br />Caisson Drilling 0.089 0.031 0.011 <br />Loaded Trucks 0.076 0.027 0.010 <br />Jackhammer 0.035 0.012 0.004 <br />Small Bulldozer 0.003 0.001 0.0004 <br />(1) Source: Federal Transit Administration: Transit Noise and Vibration Impact Assessment, 2006. <br />(2) Bold values are considered annoying to people. <br /> <br />Annoyance to Persons <br /> <br />The primary effect of perceptible vibration is often a concern. However, secondary effects, such as the <br />rattling of a china cabinet, can also occur, even when vibration levels are well below perception. Any <br />effect (primary perceptible vibration, secondary effects, or a combination of the two) can lead to <br />vibration annoyance. The degree that a person is annoyed depends on the activity they are <br />participating at the time of the disturbance. For example, someone sleeping or reading would be more <br />sensitive than someone who is running on a treadmill. Reoccurring primary and secondary vibration <br />effects often lead people to believe that the vibration is damaging their home, although vibration levels <br />are well below minimum thresholds for damage potential. <br /> <br />As shown in Table 24, vibration is annoying at a peak particle velocity (PPV) of 0.20. The closest <br />structure adjacent to the project is approximately ten feet from the eastern property line. At ten feet, the <br />use of a vibratory roller would generate a PPV of 0.575 and a large bulldozer would generate a PPV of <br />0.244. Annoyance would be short-term and occur only during site grading and preparation when <br />vibration generation equipment is in operation and during City allowed hours of construction. <br /> <br />Table 24 <br />Typical Human Reaction and Effect on Buildings Due to Groundborne Vibration <br /> <br />Vibration Level <br />Human Reaction Effect on Buildings Peak Particle Velocity (PPV) <br />0.006–0.019 in/sec Threshold of perception, <br />possibility of intrusion <br />Vibrations unlikely to cause damage <br />of any type <br />0.08 in/sec Vibrations readily perceptible <br />Recommended upper level of <br />vibration to which ruins and ancient <br />monuments should be subjected <br />6-108