{"data":{"id":"us/30-cfr-appendix-to-part-62","jurisdiction":"us","citation":"30 CFR Appendix to Part 62","heading":"Appendix to Part 62","body":"Table 62-1—Reference Duration\ndBA T (hours)\n80 32.0\n85 16.0\n86 13.9\n87 12.1\n88 10.6\n89 9.2\n90 8.0\n91 7.0\n92 6.1\n93 5.3\n94 4.6\n95 4.0\n96 3.5\n97 3.0\n98 2.6\n99 2.3\n100 2.0\n101 1.7\n102 1.5\n103 1.3\n104 1.1\n105 1.0\n106 0.87\n107 0.76\n108 0.66\n109 0.57\n110 0.50\n111 0.44\n112 0.38\n113 0.33\n114 0.29\n115 0.25\nAt 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.\nTable 62-2—“Dose”TWA 8 Equivalent\nDose TWA8 (percent)\n25 80\n29 81\n33 82\n38 83\n44 84\n50 85\n57 86\n66 87\n76 88\n87 89\n100 90\n115 91\n132 92\n152 93\n174 94\n200 95\n230 96\n264 97\n303 98\n350 99\n400 100\n460 101\n530 102\n610 103\n700 104\n800 105\n920 106\n1056 107\n1213 108\n1393 109\n1600 110\n1838 111\n2111 112\n2425 113\n2786 114\n3200 115\nInterpolate between the values found in this Table, or extend the Table, by using the formula: TWA8 = 16.61 log10 (D/100) + 90.\nTable 62-3—Age Correction Value in Decibels for Males (Selected Frequencies)\nAge (years) kHz\n2 3 4\n20 or less 3 4 5\n21 3 4 5\n22 3 4 5\n23 3 4 6\n24 3 5 6\n25 3 5 7\n26 4 5 7\n27 4 6 7\n28 4 6 8\n29 4 6 8\n30 4 6 9\n31 4 7 9\n32 5 7 10\n33 5 7 10\n34 5 8 11\n35 5 8 11\n36 5 9 12\n37 6 9 12\n38 6 9 13\n39 6 10 14\n40 6 10 14\n41 6 10 14\n42 7 11 16\n43 7 12 16\n44 7 12 17\n45 7 13 18\n46 8 13 19\n47 8 14 19\n48 8 14 20\n49 9 15 21\n50 9 16 22\n51 9 16 23\n52 10 17 24\n53 10 18 25\n54 10 18 26\n55 11 19 27\n56 11 20 28\n57 11 21 29\n58 12 22 31\n59 12 22 32\n60 or more 13 23 33\nTable 62-4—Age Correction Value in Decibels for Females (Selected Frequencies)\nAge (years) kHz\n2 3 4\n20 or less 4 3 3\n21 4 4 3\n22 4 4 4\n23 5 4 4\n24 5 4 4\n25 5 4 4\n26 5 5 4\n27 5 5 5\n28 5 5 5\n29 5 5 5\n30 6 5 5\n31 6 6 5\n32 6 6 6\n33 6 6 6\n34 6 6 6\n35 6 7 7\n36 7 7 7\n37 7 7 7\n38 7 7 7\n39 7 8 8\n40 7 8 8\n41 8 8 8\n42 8 9 9\n43 8 9 9\n44 8 9 9\n45 8 10 10\n46 9 10 10\n47 9 10 11\n48 9 11 11\n49 9 11 11\n50 10 11 12\n51 10 11 12\n52 10 12 13\n53 10 13 13\n54 11 13 14\n55 11 14 14\n56 11 14 15\n57 11 15 15\n58 12 15 16\n59 12 16 16\n60 or more 12 16 17","path":["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"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"b14e8a2374d95dba618c11035635041120324c554677e59d92a99f844c094bcf","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-62.190","next":"us/30-cfr-70.1"},"notice":"GroundRules: Original legal text. Not legal advice."}