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<br /> <br />ͭͲͱͱʹ-ͬͰ Noise Memo.docx ͭͯ Warner Avenue Footlab <br />TABLE 5: CONSTRUCTION EQUIPMENT REFERENCE NOISE LEVELS <br />Construction <br />Stage <br />Reference <br />Construction Equipmnet1 <br />Reference Noise <br />Level @ 50 Feet <br />(dBA Leq) <br />Composite <br />Reference Noise <br />Level <br />(dBA Leq)2 <br />Reference <br />Power Level <br />(dBA Lw)3 <br />Demolition <br />Jack Hammer 82 <br />86.2 117.9 Concrete Saw 83 <br />Dozer 78 <br />Site <br />Preparation <br />Tractor 80 <br />84.0 115.6 Backhoe 74 <br />Grader 81 <br />Grading <br />Scraper 80 <br />83.3 114.9 Excavator 77 <br />Dozer 78 <br />Building <br />Construction <br />Crane 73 <br />81.1 112.8 Tractor 80 <br />Welder/Torch 70 <br />Architectural <br />Coating <br />Man Lift 68 <br />79.8 111.4 Compressor (air) 74 <br />Generator 78 <br />Paving <br />Paver 74 <br />77.8 109.5 Dump Truck 72 <br />Roller 73 <br />1 FHWA Road Construction Noise Model. <br />2 Represents the combined noise level for all equipment assuming they operate at the same time consistent with FTA Transit Noise and <br />Vibration Impact Assessment guidance. <br />3 Sound power level represents the total amount of acoustical energy (noise level) produced by a sound source independent of distance or <br />surroundings. <br />To account for the dynamic nature of construction activities, the CadnaA construction noise analysis <br />evaluates the noise source activities as multiple moving point sources, or construction crews, within <br />the limits of construction. Construction impacts are based on the loudest activity and the highest <br />noise level calculated at each receiver location. As shown in Table Ͳ, the construction noise levels <br />are expected to range from ͱͯ.Ͱ to Ͳͭ.ͭ dBA Leq at the nearby receiver locations. Appendix C includes <br />the detailed CadnaA construction noise model inputs. <br /> <br />