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=Phil Martin&Associates, Inc. <br />Human/Structural Response <br />LEGACY SUNFLOWER I CITY OF SANTA ANA <br />VELOCITY <br />LEVEL* <br />Threshold, minor cosmetic damage 10 <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 11 <br />events (e.g, rapid transit) <br />Limit for vibration sensitive <br />equipment. Approximate threshold <br />for human perception of vibration <br />Typical Sources <br />(50 ft from source) <br />Blasting from construction projects <br />G Bulldozers and other heavy tracked <br />construction equipment <br />Commuter rail, upper range <br />s Rapid transit, upper range <br />4 Commuter rail, typical <br />If Bus or truck over bump <br />4 Rapid transit, typical <br />t Bus or truck, typical <br />4 Typical background vibration <br />` RMS Vibration Velocity Level in dB relative to 10 -6 inches/second <br />Source: FRA, 2012. Federal Railroad Administration High -Speed 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 />Page 85 <br />