Federal regulations · Through 2026-08-25 · Newer source version available

30 CFR Appendix to Part 62: Appendix to Part 62

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.
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.
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
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

Where this section sits in the code

Title 30—Mineral Resources
CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
SUBCHAPTER M—UNIFORM MINE HEALTH REGULATIONS
PART 62—OCCUPATIONAL NOISE EXPOSURE

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.

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.

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

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

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