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5.7 NOISE <br /> TABLE 5.7-9 <br /> Noise Levels from Common Construction Equipment at Various Distances <br /> Typical Sound Typical Sound Typical Sound <br /> Pressure Level at Pressure Level at Pressure Level at <br /> Construction Equipment 50 feet(dBA) 1,500 feet(dBA) 4,000 feet(dBA) <br /> Pile Drivers(20,000-32,000 ft-lbs./blow) 104 74 65 <br /> Dozer(250-700 hp) 88 58 49 <br /> Front End Loader(6-15 cu.yds.) 88 58 49 <br /> Trucks(200-400 hp) 86 56 47 <br /> Grader(13 to 16 ft. blade) 85 55 46 <br /> Shovels (2-5 cu. yds.) 84 54 45 <br /> Portable Generators(50-200 kW) 84 54 45 <br /> Derrick Crane(11-20 tons) 83 53 44 <br /> Mobile Crane(11-20 tons) 83 53 44 <br /> Concrete Pumps (30-150 cu.yds.) 81 51 42 <br /> Tractor(3/4 to 2 cu. yds.) 80 50 41 <br /> Unquieted Paving Breaker 80 50 41 <br /> Quieted Paving Breaker 73 43 34 <br /> Noise generated during the testing and commissioning phase of the project is not expected <br /> to be substantially different from that produced during normal full-load operation. Starts <br /> and abrupt stops are more frequent during this period, but they are usually short lived. <br /> 5.7.3.2.2 Construction Vibration <br /> Construction vibrations can be divided into three classes,based on the wave form and its <br /> source (see Table 5.7-10). Pile driving, if required,will be limited to daytime hours in the <br /> event a complaint is received and will be of short duration;therefore,no mitigation is <br /> required. <br /> TABLE 5.7-10 <br /> Construction Vibrations <br /> Wave Form Example Source <br /> Impact Impact pile driver or blasting <br /> Steady state Vibratory pile driver <br /> Pseudo steady state Double acting pile hammer <br /> 5.7.3.2.3 Worker Exposure to Noise <br /> Worker exposure levels during construction of the LEC will vary depending on the phase of <br /> the project and the proximity of the workers to the noise-generating activities. Construction <br /> noise is potentially harmful to the health and hearing of construction workers. As required <br /> SAC/371322/08234009(LEC_5.7_NOISE.DOC) 5.7-13 <br />