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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 />Table 17 <br />Typical Construction Equipment Noise Levels <br />Type of Equipment <br />Range of Maximum Sound <br />Levels <br />Measured (dBA at 50 feet) <br />Suggested Maximum Sound <br />Levels <br />for Analysis (dBA at 50 feet) <br />Rock Drills <br />83-99 <br />96 <br />Jack Hammers <br />75-85 <br />82 <br />Pneumatic Tools <br />78-88 <br />85 <br />Pumps <br />74-84 <br />80 <br />Dozers <br />77-90 <br />85 <br />Scrappers <br />83-91 <br />87 <br />Haul Trucks <br />83-94 <br />88 <br />Cranes <br />79-86 <br />82 <br />Portable Generators <br />71-87 <br />80 <br />Rollers <br />75-82 <br />80 <br />Tractors <br />77-82 <br />80 <br />Front -End Loaders <br />77-90 <br />86 <br />Hydraulic Excavators <br />81-90 <br />86 <br />Graders <br />79-89 <br />86 <br />Air Compressors <br />76-89 <br />86 <br />Trucks <br />81-87 <br />86 <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 CaIEEMod modeling (Ganddini Group, Inc., 2019). <br />Demolition <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 />Legacy Sunflower Apartments Page 77 <br />Mitigated Negative Declaration —March 14, 2019 <br />751-163 <br />