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4.6 – Noise Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 4.6-9 On-Site Construction Noise Construction activities would require the use of standard construction equipment such as loaders, dozers, backhoes, excavators, graders, pumps, rollers, and cranes. Construct ion equipment with substantially higher noise -generation characteristics (such as pile drivers, rock drills, blasting equipment) would not be necessary for the Project. The range of maximum noise levels for various types of construction equipment at a distance of 50 feet is depicted in Table 4.6-4. The noise values represent maximum noise generation, or full-power operation of the equipment. Simultaneous operation of more than one piece of equipment would increase the sound level of the equipment operating individually. As an example, a loader and two dozers, all operating at full power and relatively close together, would generate a maximum sound level of approximately 90 dBA at 50 feet from their operating locations. As one increases the distance between equipment and/or increases the separation of areas with simultaneous construction activity, dispersion and distance attenuation reduce the effects of separate noise sources added together. In addition, typical operating cycles may involve 2 minutes of full-power operation, followed by 3 or 4 minutes at lower levels. The average noise level during construction activity is generally lower because maximum noise generation may only occur up to 50% of the time. Table 4.6-4. Construction Equipment Maximum Noise Emission Levels Equipment Maximum Sound Level (dBA) 50 Feet from Source Roller 74 Concrete vibrator 76 Pump 76 Saw 76 Backhoe 80 Air compressor 81 Generator 81 Compactor 82 Concrete pump 82 Crane, mobile 83 Concrete mixer 85 Dozer 85 Grader 85 Impact wrench 85 Loader 85 Pneumatic tool 85 Jackhammer 88 Truck 88 Paver 89 Source: FTA 2018.