30 CFR Appendix to Part 62
July 29, 2020
Table 62-1—Reference Duration
Open Table
| 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
Open Table
| 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)
Open Table
| 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)
Open Table
| 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]
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.
