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<br />Legacy Sunflower Apartments Page 77 <br />Mitigated Negative Declaration – March 14, 2019 <br /> <br />occurs at an individual time period. Operating cycles for these types of construction equipment may <br />involve one or two minutes of full power operation followed by three to four minutes at lower power <br />settings. Other primary sources of noise levels would be due to random incidents, which would last <br />less than one minute (such as dropping large pieces of equipment or the hydraulic movement of <br />machinery lifts). <br /> <br />Table 17 <br />Typical Construction Equipment Noise Levels <br /> <br />Type of Equipment <br />Range of Maximum Sound <br />Levels <br />Suggested Maximum Sound <br />Levels <br />Measured (dBA at 50 feet) for Analysis (dBA at 50 feet) <br />Rock Drills 83-99 96 <br />Jack Hammers 75-85 82 <br />Pneumatic Tools 78-88 85 <br />Pumps 74-84 80 <br />Dozers 77-90 85 <br />Scrappers 83-91 87 <br />Haul Trucks 83-94 88 <br />Cranes 79-86 82 <br />Portable Generators 71-87 80 <br />Rollers 75-82 80 <br />Tractors 77-82 80 <br />Front-End Loaders 77-90 86 <br />Hydraulic Excavators 81-90 86 <br />Graders 79-89 86 <br />Air Compressors 76-89 86 <br />Trucks 81-87 86 <br /> <br />A worst-case construction noise scenario was calculated using the Federal Highway Administration's <br />Roadway Construction Noise Model. The construction equipment that was used in the model was <br />based on the project’s Air Quality and Greenhouse Gas Impact Analysis default construction equipment <br />list identified in the CalEEMod modeling (Ganddini Group, Inc., 2019). <br /> <br />Demolition <br /> <br />The project would require demolition of the existing church, church parking lot and other site <br />improvements. The noise levels that would be generated to the adjacent land uses during demolition <br />activities are shown below in Table 18. <br /> <br />6-99