[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR62.110]

[Page 413]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 62--OCCUPATIONAL NOISE EXPOSURE--Table of Contents
 
Sec. 62.110  Noise exposure assessment.

    (a) The mine operator must establish a system of monitoring that 
evaluates each miner's noise exposure sufficiently to determine 
continuing compliance with this part.
    (b) The mine operator must determine a miner's noise dose (D, in 
percent) by using a noise dosimeter or by computing the formula: 
D=100(C1/T1+C2/T2+ . . . . 
+Cn/Tn), where Cn is the total time the miner is 
exposed at a specified sound level, and Tn is the reference 
duration of exposure at that sound level shown in Table 62-1.
    (1) The mine operator must use Table 62-2 when converting from dose 
readings to equivalent TWA8 readings.
    (2) A miner's noise dose determination must:
    (i) Be made without adjustment for the use of any hearing protector;
    (ii) Integrate all sound levels over the appropriate range;
    (iii) Reflect the miner's full work shift;
    (iv) Use a 90-dB criterion level and a 5-dB exchange rate; and
    (v) Use the A-weighting and slow response instrument settings.
    (c) Observation of monitoring. The mine operator must provide 
affected miners and their representatives with an opportunity to observe 
noise exposure monitoring required by this section and must give prior 
notice of the date and time of intended exposure monitoring to affected 
miners and their representatives.
    (d) Miner notification. The mine operator must notify a miner of his 
or her exposure when the miner's exposure is determined to equal or 
exceed the action level, exceed the permissible exposure level, or 
exceed the dual hearing protection level, provided the mine operator has 
not notified the miner of an exposure at such level within the prior 12 
months. The mine operator must base the notification on an exposure 
evaluation conducted either by the mine operator or by an authorized 
representative of the Secretary of Labor. The mine operator must notify 
the miner in writing within 15 calendar days of:
    (1) The exposure determination; and (2) the corrective action being 
taken.
    (e) The mine operator must maintain a copy of any such miner 
notification, or a list on which the relevant information about that 
miner's notice is recorded, for the duration of the affected miner's 
exposure at or above the action level and for at least 6 months 
thereafter.