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4. ENVIRONMENTAL ANALYSIS <br /> V 4.5 NOISE <br /> TABLE 45-4 <br /> TYPICAL CONSTRUCTION EQUIPMENT NOISE LEVELS <br /> Equipment Noise Level(dBA)@ 50 Feet With Feasible Noise Controla <br /> Earthmoving <br /> Front Loader 79 75 <br /> Backhoe 85 75 <br /> Dozer 80 75 <br /> Tractor 80 75 <br /> Scraper 88 80 <br /> ... Grader 85 75 <br /> Paver 89 80 <br /> Materials Handling <br /> Concrete Mixer 85 75 <br /> Concrete Pump 82 75 <br /> _ Crane 83 75 <br /> Stationary <br /> Pump 76 75 <br /> r_ Generator 78 75 <br /> impact <br /> Jack Hammer 88 75 <br /> Pneumatic Tools 86 80 <br /> Other <br /> ` Saw 78 75 <br /> Vibrator 76 75 <br /> a Estimated levels obtainable by selecting quieter procedures or machines and implementing noise-control features <br /> r <br /> requiring no major redesign or extreme cos[. <br /> SOURCE: U.S.Environmental Protection Agency,Noise from Construction Equipment and Operations,Building <br /> Equipment,and Home Appliances, December 1971. <br /> Gap <br /> The effect of mining noise on nearby sensitive receptors would depend on multiple variables, <br /> including the distance to nearby sensitive receptors,whether a direct line of site exists between <br /> the noise source and receptors, mining depth,the rate of noise attenuation, and the existing <br /> ambient sound levels at sensitive receptors. Mining activities would reach an average depth of <br /> 100 feet below the existing ground surface. When mining activities take place close to the <br /> surface,noise levels would have a greater potential to impact nearby residences; as the mined pit <br /> becomes deeper,noise levels would drop off since there would be no clear line of sight between <br /> the source and the receptor. Similarly,minting noise would be less noticeable at sensitive <br /> RMC Pacific Vernalis Quarry Mining and Reclamation Project 4.5-13 BSA/203015 <br /> Administrative Draft Eni March 2004 <br />