Title 30: Mineral Resources
PART 62—OCCUPATIONAL NOISE EXPOSURE
Appendix to Part 62
Table 62-1_Reference Duration------------------------------------------------------------------------ dBA T (hours)------------------------------------------------------------------------80........................................................ 32.085........................................................ 16.086........................................................ 13.987........................................................ 12.188........................................................ 10.689........................................................ 9.290........................................................ 8.091........................................................ 7.092........................................................ 6.193........................................................ 5.394........................................................ 4.695........................................................ 4.096........................................................ 3.597........................................................ 3.098........................................................ 2.699........................................................ 2.3100....................................................... 2.0101....................................................... 1.7102....................................................... 1.5103....................................................... 1.3104....................................................... 1.1105....................................................... 1.0106....................................................... 0.87107....................................................... 0.76108....................................................... 0.66109....................................................... 0.57110....................................................... 0.50111....................................................... 0.44112....................................................... 0.38113....................................................... 0.33114....................................................... 0.29115....................................................... 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------------------------------------------------------------------------ TWA\8\ Dose (percent)------------------------------------------------------------------------25........................................................... 8029........................................................... 8133........................................................... 8238........................................................... 8344........................................................... 8450........................................................... 8557........................................................... 8666........................................................... 8776........................................................... 8887........................................................... 89100.......................................................... 90115.......................................................... 91132.......................................................... 92152.......................................................... 93174.......................................................... 94200.......................................................... 95230.......................................................... 96264.......................................................... 97303.......................................................... 98350.......................................................... 99400.......................................................... 100460.......................................................... 101530.......................................................... 102610.......................................................... 103700.......................................................... 104800.......................................................... 105920.......................................................... 1061056......................................................... 1071213......................................................... 1081393......................................................... 1091600......................................................... 1101838......................................................... 1112111......................................................... 1122425......................................................... 1132786......................................................... 1143200......................................................... 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)------------------------------------------------------------------------ kHz Age (years) ----------------------- 2 3 4------------------------------------------------------------------------20 or less...................................... 3 4 521.............................................. 3 4 522.............................................. 3 4 523.............................................. 3 4 624.............................................. 3 5 625.............................................. 3 5 726.............................................. 4 5 727.............................................. 4 6 728.............................................. 4 6 829.............................................. 4 6 830.............................................. 4 6 931.............................................. 4 7 932.............................................. 5 7 1033.............................................. 5 7 1034.............................................. 5 8 1135.............................................. 5 8 1136.............................................. 5 9 1237.............................................. 6 9 1238.............................................. 6 9 1339.............................................. 6 10 1440.............................................. 6 10 1441.............................................. 6 10 1442.............................................. 7 11 1643.............................................. 7 12 1644.............................................. 7 12 1745.............................................. 7 13 1846.............................................. 8 13 1947.............................................. 8 14 1948.............................................. 8 14 2049.............................................. 9 15 2150.............................................. 9 16 2251.............................................. 9 16 2352.............................................. 10 17 2453.............................................. 10 18 2554.............................................. 10 18 2655.............................................. 11 19 2756.............................................. 11 20 2857.............................................. 11 21 2958.............................................. 12 22 3159.............................................. 12 22 3260 or more...................................... 13 23 33------------------------------------------------------------------------
Table 62-4_Age Correction Value in Decibels for Females (Selected Frequencies)------------------------------------------------------------------------ kHz Age (years) ----------------------- 2 3 4------------------------------------------------------------------------20 or less...................................... 4 3 321.............................................. 4 4 322.............................................. 4 4 423.............................................. 5 4 424.............................................. 5 4 425.............................................. 5 4 426.............................................. 5 5 427.............................................. 5 5 528.............................................. 5 5 529.............................................. 5 5 530.............................................. 6 5 531.............................................. 6 6 532.............................................. 6 6 633.............................................. 6 6 634.............................................. 6 6 635.............................................. 6 7 736.............................................. 7 7 737.............................................. 7 7 738.............................................. 7 7 739.............................................. 7 8 840.............................................. 7 8 841.............................................. 8 8 842.............................................. 8 9 943.............................................. 8 9 944.............................................. 8 9 945.............................................. 8 10 1046.............................................. 9 10 1047.............................................. 9 10 1148.............................................. 9 11 1149.............................................. 9 11 1150.............................................. 10 11 1251.............................................. 10 11 1252.............................................. 10 12 1353.............................................. 10 13 1354.............................................. 11 13 1455.............................................. 11 14 1456.............................................. 11 14 1557.............................................. 11 15 1558.............................................. 12 15 1659.............................................. 12 16 1660 or more...................................... 12 16 17------------------------------------------------------------------------
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[64 FR 49630, Sept. 13, 1999, as amended at 65 FR 66929, Nov. 8, 2000]
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