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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR <br />CITY OF SANTA ANA <br />5. Environmental Analysis <br />NOISE <br />Table 5.9 -10 Construction Equipment Noise Levels <br />Equipment <br />Noise Level (dBA) at 50 ft <br />Typical Duty Cycle <br />Auger Drill Rig <br />85 <br />20% <br />Backhoe <br />80 <br />40% <br />Blasting <br />94 <br />1% <br />Chain Saw <br />85 <br />20% <br />Clam Shovel <br />93 <br />20% <br />Compactor (ground) <br />80 <br />20% <br />Compressor (air) <br />80 <br />40 % <br />Concrete Mixer Truck <br />85 <br />40% <br />Concrete Pump <br />82 <br />20% <br />Concrete Saw <br />90 <br />20% <br />Crane (mobile or stationary) <br />85 <br />20% <br />Dozer <br />85 <br />40% <br />Dump Truck <br />84 <br />40% <br />Excavator <br />85 <br />40% <br />Front End Loader <br />80 <br />40% <br />Generator (25 KVA or less) <br />70 <br />50% <br />Generator (more than 25 KVA) <br />82 <br />50% <br />Grader <br />85 <br />40% <br />Hydra Break Ram <br />90 <br />10% <br />In situ Soil Sampling Rig <br />84 <br />20% <br />Jackhammer <br />85 <br />20% <br />Mounted Impact Hammer (hoe ram) <br />90 <br />20% <br />Paver <br />85 <br />50% <br />Pneumatic Tools <br />85 <br />50% <br />Pumps <br />77 <br />50% <br />Rack Drill <br />85 <br />20% <br />Scraper <br />85 <br />40 % <br />Tractor <br />84 <br />40% <br />Vacuum Excavator (vac-truck) <br />85 <br />40% <br />Vibratory Concrete Mixer <br />80 <br />20% <br />Soume: Thalheimer 2000. <br />KVA = kilovolt amps <br />Each stage of construction has a different equipment mix, depending on the work to be accomplished during <br />that stage. The noise produced at each stage is determined by combining the Ley contributions from each <br />piece of equipment used at a given time. In the construction of residential and mixed use projects, <br />demolition and grading activities generate the highest noise levels. <br />Because of the effects of noise attenuation due to distance, the number and type of equipment, and the load <br />and power requirements to accomplish different tasks during each construction phase, construction activities <br />Page 5.9 -78 PlaceWorkr <br />