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City of Santa Ana -Park View at Town and Country Manor <br />Noise Draft EIR <br />Construction Vibration <br />Construction activities can produce vibration that may be felt by adjacent uses. The construction of <br />the proposed project would primarily require the use of equipment such as bulldozers, backhoes, <br />crawler tractors, jackhammers, and scrapers, and in some cases, would require the use of pile drivers, <br />which are known to generate substantial construction vibration levels. Table 4.5 -6 provides vibration <br />amplitudes for construction equipment. <br />Table 4.5 -6: Vibration Source Amplitudes for Construction Equipment <br />uipment <br />7Large <br />rence PPV at 25 <br />ft (in /sec) <br />0.65 <br />0.210 <br />Bulldozer <br />0.089 <br />Caisson drilling <br />0.089 <br />Loaded Trucks <br />0.076 <br />Jackhammer <br />0.035 <br />Small bulldozer <br />0.003 <br />Crack-and-seat operations <br />2.4 <br />Sources: Caltrans, Transportation- and- Constmction- Induced Vibration <br />Guidance Manual, 2004. <br />For most project construction, a vibratory roller would produce the greatest amount of vibration on <br />the project site, with a 0.210 PPV at 25 feet. Construction of the 8 -story tower and subterranean <br />parking would likely include the use of a pile driver. The pile driver would produce the greatest <br />construction vibration at approximately 0.65 PPV at 25 feet. Because existing buildings vary in <br />distance from anticipated equipment use, worst -case scenarios were analyzed separately for the use of <br />a vibratory roller and for the use of a pile driver. Sensitive receptors in the project area are listed in <br />Table 4.5 -3, along with distance from the project site to each sensitive receptor. <br />Construction activities would include both single vibratory events and periods in which multiple or <br />continuous vibration would occur. Therefore, construction impacts were assessed using the <br />continuous /frequent intermittent structural damage vibration threshold of 0.5 PPV for construction. <br />Table 4.5 -7 and Table 4.5 -8 provide the estimated construction vibration levels at the residences and <br />other sensitive receptors. <br />4.5 -14 Michael Brandman Associates <br />H\Clievt(PN -Rn) 327b327WMDEMVB270030 Sec0 Noi�. <br />