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MSHA -  Title 30 CFR
30 CFR §62.174

 Follow-up corrective measures when a standard threshold shift is detected

The mine operator must, within 30 calendar days of receiving evidence or confirmation of a standard threshold shift, unless a physician or audiologist determines the standard threshold shift is neither work-related nor aggravated by occupational noise exposure:

(a) retrain the miner, including the instruction required by §62.180 of this part;

(b) provide the miner with the opportunity to select a hearing protector, or a different hearing protector if the miner has previously selected a hearing protector, from among those offered by the mine operator in accordance with §62.160 of this part; and

(c) review the effectiveness of any engineering and administrative controls to identify and correct any deficiencies.