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    Noise -The revised MSHA noise standard was developed to protect miners’ hearing, based on research indicating that hearing loss occurs with average sound levels below 90 dBA. The operations monitored in this study had average sound levels less than 90 dBA but over 85 dBA, the new level for required hearing protection programs.Decibel Level Of A Stone Crusher Crusher Mills, Cone,Noise Analysis Las Pilitas Rock Quarry SLO County Home Page fed into the portable rock crushing plant. The rock is screened to separate the material into different sizes. Maximum level,

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