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Eagle Mountain Major Gravel Operations <br />High Level HSE Review <br />r 3 ,? At 70 in, the approximate distance of the nearest residence (represented by the 70m case), the <br />theoretical sound level range is approximated to be 51 - 54.7 dB (table 3) . Though the existing <br />sound level in the area is not known, it is anticipated to range from 20 - 30 dB or less, for a <br />difference of roughly 15 - 35 dB as illustrated in Table 4 below, resulting in a significant <br />difference (note: 10 dB existing background is also provided in Table 4). <br />-6- <br />Table 4 - Delta Change in Theoretical Noise Level