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<br /> <br />ͭͲͱͱʹ-ͬͰ Noise Memo.docx ͭͱ Warner Avenue Footlab <br />TABLE 8: VIBRATION SOURCE LEVELS FOR CONSTRUCTION EQUIPMENT <br />Equipment PPV (in/sec) <br />at 25 feet <br />Small bulldozer 0.003 <br />Jackhammer 0.035 <br />Loaded Trucks 0.076 <br />Large bulldozer 0.089 <br />Vibratory Roller 0.210 <br />Federal Transit AdministraƟon, Transit Noise and VibraƟon Impact Assessment Manual <br />Using the vibration source level of construction equipment provided in Table 8 and the <br />construction vibration assessment methodology published by the FTA, it is possible to <br />estimate the Project vibration impacts. Table 9 presents the expected Project-related <br />vibration levels at the nearby receiver locations. At distances ranging from 149 to 239 feet <br />from Project construction activities, construction vibration velocity levels are estimated to <br />range from less than 0.01 to 0.01 PPV (in/sec). Based on the maximum acceptable <br />continuous vibration threshold of 0.30 PPV (in/sec), the typical Project construction <br />vibration levels will fall below the thresholds at all the noise-sensitive receiver locations. <br />Therefore, the Project-related vibration impacts are considered less than significant during <br />typical construction activities at the Project site. <br />TABLE 9: PROJECT CONSTRUCTION VIBRATION LEVELS <br />Location1 <br />Distance <br />to <br />Const. <br />Activity <br />(Feet)2 <br />Typical Construction Vibration Levels <br />PPV (in/sec)3 Thresholds <br />PPV <br />(in/sec)4 <br />Thresholds <br />Exceeded?5 Small <br />bulldozer <br />Jack- <br />hammer <br />Loaded <br />Trucks <br />Large <br />bulldozer <br />Vibratory <br />Roller <br />Highest <br />Vibration <br />Level <br />R1 149' 0.00 0.00 0.01 0.01 0.01 0.01 0.30 No <br />R2 223' 0.00 0.00 0.00 0.00 0.01 0.01 0.30 No <br />R3 239' 0.00 0.00 0.00 0.00 0.01 0.01 0.30 No <br />1 Construction noise source and receiver locations are shown in Exhibit 5. <br />2 Distance from receiver building facade to Project construction boundary (Project site boundary). <br />3 Based on the Vibration Source Levels of Construction Equipment (Table 8). <br />4 Caltrans Transportation and Construction Vibration Guidance Manual, April 2020, Table 19, p. 38. <br />5 Does the peak vibration exceed the acceptable vibration thresholds? <br />"PPV" = Peak Particle Velocity <br /> <br />