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Inspiration Resources <br /> Noise levels from mining and scraper fleet operations <br /> Three scraper fleet making seven trips per hour <br /> Leq Distance <br /> (feet) <br /> 68 . 8 100 <br /> 62 .8 250 <br /> 58 . 3 500 <br /> 55.7 750 <br /> 53 . 8 1000 <br />