1. LawStack
  2. Title 30 - Mineral Resources
  3. Chapter I - Mine Safety and Health Administration, Department of Labor
  4. Subchapter M - Uniform Mine Health Regulations
  5. Part 62 - Occupational Noise Exposure
  6. 30 CFR Appendix Appendix to Part 62
30 CFR Appendix Appendix to Part 62
Appendix to Part 62
May 28, 2026
CFR

Appendix to Part 62

Open Table

Table 62-1—Reference Duration
dBA T (hours)
80 32.0
85 16.0
86 13.9
87 12.1
88 10.6
89 9.2
90 8.0
91 7.0
92 6.1
93 5.3
94 4.6
95 4.0
96 3.5
97 3.0
98 2.6
99 2.3
100 2.0
101 1.7
102 1.5
103 1.3
104 1.1
105 1.0
106 0.87
107 0.76
108 0.66
109 0.57
110 0.50
111 0.44
112 0.38
113 0.33
114 0.29
115 0.25
At no time shall any excursion exceed 115 dBA. For any value, the reference duration (T) in hours is computed by: T = 8/2(L−90)/5 where L is the measured A-weighted, slow-response sound pressure level.
Open Table

Table 62-2—“Dose”TWA 8 Equivalent
Dose TWA8
(percent)
25 80
29 81
33 82
38 83
44 84
50 85
57 86
66 87
76 88
87 89
100 90
115 91
132 92
152 93
174 94
200 95
230 96
264 97
303 98
350 99
400 100
460 101
530 102
610 103
700 104
800 105
920 106
1056 107
1213 108
1393 109
1600 110
1838 111
2111 112
2425 113
2786 114
3200 115
Interpolate between the values found in this Table, or extend the Table, by using the formula: TWA8 = 16.61 log10 (D/100) + 90.
Open Table

Table 62-3—Age Correction Value in Decibels for Males (Selected Frequencies)
Age (years) kHz
2 3 4
20 or less 3 4 5
21 3 4 5
22 3 4 5
23 3 4 6
24 3 5 6
25 3 5 7
26 4 5 7
27 4 6 7
28 4 6 8
29 4 6 8
30 4 6 9
31 4 7 9
32 5 7 10
33 5 7 10
34 5 8 11
35 5 8 11
36 5 9 12
37 6 9 12
38 6 9 13
39 6 10 14
40 6 10 14
41 6 10 14
42 7 11 16
43 7 12 16
44 7 12 17
45 7 13 18
46 8 13 19
47 8 14 19
48 8 14 20
49 9 15 21
50 9 16 22
51 9 16 23
52 10 17 24
53 10 18 25
54 10 18 26
55 11 19 27
56 11 20 28
57 11 21 29
58 12 22 31
59 12 22 32
60 or more 13 23 33
Open Table

Table 62-4—Age Correction Value in Decibels for Females (Selected Frequencies)
Age (years) kHz
2 3 4
20 or less 4 3 3
21 4 4 3
22 4 4 4
23 5 4 4
24 5 4 4
25 5 4 4
26 5 5 4
27 5 5 5
28 5 5 5
29 5 5 5
30 6 5 5
31 6 6 5
32 6 6 6
33 6 6 6
34 6 6 6
35 6 7 7
36 7 7 7
37 7 7 7
38 7 7 7
39 7 8 8
40 7 8 8
41 8 8 8
42 8 9 9
43 8 9 9
44 8 9 9
45 8 10 10
46 9 10 10
47 9 10 11
48 9 11 11
49 9 11 11
50 10 11 12
51 10 11 12
52 10 12 13
53 10 13 13
54 11 13 14
55 11 14 14
56 11 14 15
57 11 15 15
58 12 15 16
59 12 16 16
60 or more 12 16 17

[64 FR 49630, Sept. 13, 1999, as amended at 65 FR 66929, Nov. 8, 2000]

Previous
§ 62.190 Records
Next
§ 62.100 Purpose and scope; effective date

Tried the LawStack mobile app?

Join thousands and try LawStack mobile for FREE today.

  • Carry the law offline, wherever you go.
  • Download CFR, USC, rules, and state law to your mobile device.

Designed and built by Tekk Innovations LLC, the makers of the LawStack iPhone app or Android app.

© 2020 Tekk Innovations LLC