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MPhilMartin &Associates, Inc. <br />Human/Structural Response <br />LEGACY SUNFLOWER I CITY OF SANTA ANA <br />VELOCITY <br />LEVEL* <br />Threshold, minor cosmetic damage —► <br />fragile buildings <br />Difficulty with tasks such as <br />reading a VDT screen <br />Residential annoyance, infrequent -: <br />events (e.g. commuter rail) <br />Residential annoyance, frequent <br />events (e.g. rapid transit) <br />Limit for vibration sensitive — 0 <br />equipment. Approltimate threshold <br />for human perception of vibration <br />Typical Sources <br />(50 ft from source) <br />a Blasting from construction projects <br />[ Bulldozers and other heavy tracked <br />construction equipment <br /><— Commuter rail, upper range <br />Rapid transit, upper range <br />t— Commuter rail, typical <br />0 Bus or truck over bump <br />t-- Rapid transit, typical <br />E Bus or truck, typical <br /><— Typical background vibration <br />* RMS Vibration Velocity Level in dB relative to 10 -6 inches/second <br />Source: FRA, 2012. Federal Railroad Administration Highspeed Ground <br />Transportation Noise and Vibration Impact Assessment. Office of Railroad <br />Policy Development, Washington, D.C. DOT/FRA(ORD-12115. September. <br />Figure 18 <br />Typical Levels of Groundborne Vibration <br />7 5 1 -171 Page 85 <br />