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rate of 5 dBA to measure MSHA PEL compliance, and 2) a criterion level of 90 dBA, a threshold limit of 80 dBA, and an exchange rate of 5 dBA for MSHA hearing protection program requirements. The microphone was clipped at the dominant hand shoulder. Measurement results using the first parameter set are compared to the MSHA PEL of

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of 50 feet. Noise levels tend to drop 5 dba for every doubling of the distance. f. The crusher will be 1200 feet from the nearest residence, at which the maximum noise level from the crushing operation will be 60 dba. At the Gilbertson residence, located 3200 feet from the crusher, the maximum noise level from the crusher will be 50 to 55 dba.

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energy is doubled (e.g., the amount of traffic doubles), there is a three dBA increase in noise, which is just barely noticeable to most people. On the other hand, if traffic increases to where there is ten times the sound energy level over a reference level, then there is a ten dBA increase and the sound is heard as twice as loud.

Level ('Il-max in dBA) 93 to 103 66-76 47-55 48-52 42-48 42-58 78 The results of sound monitoring show that source vibrations from the hoe ram crushing concrete would generally be expected to attenuate from levels of 80-100 decibels at the source to 45-55 decibels in the residential areas.

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