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Section 4.0 – Environmental Setting and Discussion of Impacts <br /> <br /> <br />City of Redwood City 76 Initial Study/Mitigated Negative Declaration <br />Sandpiper Elementary School Facilities Expansion November 2016 <br />Table 4.12-2: Construction Equipment 45-Foot Noise Emission Limits <br />Equipment Type Lmax Level (dBA)1,2 Impact/Continuous <br />Arc Welder <br />Auger Drill Rig <br />Backhoe <br />Bar Bender <br />Boring Jack Power Unit <br />Chain Saw <br />Compressor3 <br />Compressor (other) <br />Concrete Mixer <br />Concrete Pump <br />Concrete Saw <br />Concrete Vibrator <br />Crane <br />Dozer <br />Excavator <br />Front End Loader <br />Generator <br />Generator (25 KVA or less) <br />Gradall <br />Grader <br />Grinder Saw <br />Horizontal Boring Hydro Jack <br />Hydra Break Ram <br />Impact Pile Driver <br />Insitu Soil Sampling Rig <br />Jackhammer <br />Mounted Impact Hammer (hoe ram) <br />Paver <br />Pneumatic Tools <br />Pumps <br />Rock Drill <br />Scraper <br />Slurry Trenching Machine <br />Soil Mix Drill Rig <br />Street Sweeper <br />Tractor <br />Truck (dump, delivery) <br />Vacuum Excavator Truck (vac-truck) <br />Vibratory Compactor <br />Vibratory Pile Driver <br />All other equipment with engines larger than five HP <br />73 <br />85 <br />80 <br />80 <br />80 <br />85 <br />70 <br />80 <br />85 <br />82 <br />90 <br />80 <br />85 <br />85 <br />85 <br />80 <br />82 <br />70 <br />85 <br />85 <br />85 <br />80 <br />90 <br />105 <br />84 <br />85 <br />90 <br />85 <br />85 <br />77 <br />85 <br />85 <br />82 <br />80 <br />80 <br />84 <br />84 <br />85 <br />80 <br />95 <br />85 <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Impact <br />Impact <br />Continuous <br />Impact <br />Impact <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Continuous <br />Source: Illingworth & Rodkin, Inc. Acoustics and Air Quality. <br />Notes: <br />1Measured at 50 feet from the construction equipment, with a “slow” (one second) time constant. <br />2Noise limits apply to total noise emitted from equipment and associated components operating at full power while <br />engaged in its intended operation. <br />3Portable Air Compressor rated at 75 cfm or greater and that operates at greater than 50 psi. <br /> <br />7.A. - Page 107