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