#	Federal Register
1	12/29/2025 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 90:60752-60762 - McNally Tunneling Corp./ASI Marine Southerly Tunnel and Consolidation Project: Grant of Permanent Variance
2	12/29/2025 - 1926.803 - 90:60742-60752 - CBNA/Halmar Joint Venture; Potomac River Tunnel Project; Grant of Permanent Variance
3	12/29/2025 - 1926.803 - 90:60752-60762 - McNally Tunneling Corp./ASI Marine Southerly Tunnel and Consolidation Project: Grant of Permanent Variance
4	07/24/2025 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(f)(3), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 90:34887-34897 - McNally Tunneling Corp./ASI Marine Southerly Tunnel and Consolidation Project; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments
5	03/10/2023 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 88:15090-15100 - Traylor-Shea Joint Venture: Grant of Permanent Variance - PDF
6	03/11/2016 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 81:12954-12966 - Traylor Bros., Inc.; Grant of a Permanent Variance - PDF
7	12/29/2025 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 90:60742-60752 - CBNA/Halmar Joint Venture; Potomac River Tunnel Project; Grant of Permanent Variance
8	07/24/2025 - 1926.803 - 90:34887-34897 - McNally Tunneling Corp./ASI Marine Southerly Tunnel and Consolidation Project; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments
9	07/24/2025 - 1926.803 - 90:34902-34911 - CBNA/Halmar Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments
10	07/24/2025 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(f)(2), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 90:34902-34911 - CBNA/Halmar Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments
11	09/26/2024 - 1926.803 - 89:78906-78915 - Ballard Marine Construction Lower Olentangy Tunnel Project; Grant of Permanent Variance - PDF
12	09/26/2024 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(f)(2), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 89:78906-78915 - Ballard Marine Construction Lower Olentangy Tunnel Project; Grant of Permanent Variance - PDF
13	03/27/2024 - 1926.803 - 89:21274-21284 - Ballard Marine Construction Lower Olentangy Tunnel Project; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments
14	03/27/2024 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 89:21274-21284 - Ballard Marine Construction Lower Olentangy Tunnel Project; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
15	02/07/2024 - 1926.803 - 8442:8451 - Ballard Marine Construction Bay Park Conveyance Tunnel Project; Grant of Permanent Variance - PDF
16	02/07/2024 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 8442:8451 - Ballard Marine Construction Bay Park Conveyance Tunnel Project; Grant of Permanent Variance - PDF
17	11/28/2023 - 1926.803 - 88:83152-83161 - Traylor-Sundt Joint Venture: Grant of Permanent Variance
18	08/04/2023 - 1926.803 - 88:51862-51872 - Ballard Marine Construction Bay Park Conveyance Tunnel Project; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
19	08/04/2023 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(f)(2), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 88:51862-51872 - Ballard Marine Construction Bay Park Conveyance Tunnel Project; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
20	05/01/2023 - 1926.803 - 88:26600-26610 - Traylor Bros., Inc.; Application for Modification of Permanent Variance and Interim Order; Grant of Interim Order - PDF
21	03/10/2023 - 1926.803 - 88:15090-15100 - Traylor-Shea Joint Venture: Grant of Permanent Variance - PDF
22	03/10/2023 - 1926.803 - 88:15080-15090 - McNally/Kiewit Joint Venture: Grant of Permanent Variance - PDF
23	03/10/2023 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 88:15080-15090 - McNally/Kiewit Joint Venture: Grant of Permanent Variance - PDF
24	09/26/2022 - 1926.803 - 87:58379-58389 - McNally/Kiewit Shoreline Storage Tunnel Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
25	09/26/2022 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 87:58379-58389 - McNally/Kiewit Shoreline Storage Tunnel Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
26	09/03/2022 - 1926.803 - 87:54536-54547 - Traylor Bros. Inc.; Application for Modification of Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
27	09/03/2022 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 87:54536-54547 - Traylor Bros. Inc.; Application for Modification of Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
28	04/07/2021 - 1926.803 - 86:18073 - Ballard Marine Construction; Withdrawal of Application for Variance and Revocation of Interim Order - PDF
29	01/19/2021 - 1926.803 - 86:5253-5263 - Ballard Marine Construction; Application for Permanent Variance and Interim Order; Grant of Interim Order
30	01/19/2021 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(f)(2), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 86:5253-5263 - Ballard Marine Construction; Application for Permanent Variance and Interim Order; Grant of Interim Order - PDF
31	05/11/2020 - 1926.803 - 85:27767-27775 - Salini-Impregilo/Healy Joint Venture: Grant of Permanent Variance
32	05/11/2020 - 1926.803, 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii), 1926.803(f)(2), 1926.803(e)(5), 1926.803(g)(2)(vii) - 85:27767-27775 - Salini-Impregilo/Healy Joint Venture: Grant of Permanent Variance - PDF
33	08/27/2019 - 1926.803 - 84:44932-44942 - Salini-Impregilo/Healy Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments
34	08/27/2019 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 84:44932-44942 - Salini-Impregilo/Healy Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
35	03/11/2016 - 1926.803 - 81:12954-12966 - Traylor Bros., Inc.; Grant of a Permanent Variance - PDF
36	03/11/2016 - 1926.803 - 81:12969-12972 - Authorization To Open Dockets of Denied Variance Applications for Public Access - PDF
37	08/20/2015 - 1926.803 - 80:50652-50662 - Impregilo Healy Parsons Joint Venture; Grant of a PermanentVariance - PDF
38	08/20/2015 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii) - 80:50652-50662 - Impregilo Healy Parsons Joint Venture; Grant of a PermanentVariance - PDF
39	07/27/2015 - 1926.803 - 80:44386-44398 - Traylor Bros., Inc., Application for Permanent Variance andInterim Order; Grant of Interim Order; Request for Comments - PDF
40	03/27/2015 - 1926.803 - 80:16440-16449 - Traylor/Skanska/Jay Dee Joint Venture: Grant of a Permanent Variance - PDF
41	03/27/2015 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii), 1926.803(g)(2)(vii) - 80:16440-16449 - Traylor/Skanska/Jay Dee Joint Venture: Grant of a Permanent Variance - PDF
42	02/11/2015 - 1926.803 - 80:7636-7646 - Impregilo Healy Parsons Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
43	02/11/2015 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii), 1926.803(g)(2)(vii) - 80:7636-7646 - Impregilo Healy Parsons Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
44	12/11/2014 - 1926.803 - 79:73631-73641 - Traylor/Skanska/Jay Dee Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
45	12/11/2014 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii), 1926.803(g)(2)(vii) - 79:73631-73641 - Traylor/Skanska/Jay Dee Joint Venture; Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
46	05/23/2014 - 1926.803 - 79:29809-29819 - Tully/OHL USA Joint Venture: Grant of a Permanent Variance - PDF
47	05/23/2014 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii), 1926.803(g)(2)(vii) - 79:29809-29819 - Tully/OHL USA Joint Venture: Grant of a Permanent Variance - PDF
48	01/07/2014 - 1926.803 - 79:844-853 - Tully/OHL USA Joint Venture: Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
49	01/07/2014 - 1926.803, 1926.803(e)(5), 1926.803(f)(1), 1926.803(g)(1)(iii), 1926.803(g)(1)(xvii), 1926.803(g)(2)(vii) - 79:844-853 - Tully/OHL USA Joint Venture: Application for Permanent Variance and Interim Order; Grant of Interim Order; Request for Comments - PDF
50	04/17/1987 - 1926.803 - 52:12629-32 - Variance
51	04/22/1985 - 1926.803 - 50:15756 - Compressed Air
52	10/07/1983 - 1926.803 - 48:45881 - Compressed Air
53	02/16/1972 - 1926.803 - 37:3431 - Compressed Air

#	Letters of Interpretation
1	07/23/2010 - 1926.803(m)(3) - Standards for decompression chambers for use with pressurized face-tunnel boring machines.
2	07/23/2010 - 1926.803(e)(5) - Standards for decompression chambers for use with pressurized face-tunnel boring machines.
3	07/23/2010 - 1926.803, 1926.803(e)(5), 1926.803(m)(3) - Standards for decompression chambers for use with pressurized face-tunnel boring machines.
4	05/17/1988 - 1926.803 - Use of Oxygen for Decompression Underground Tunnel Workers.
5	05/27/1986 - 1926.803 - Request for a variance from decompression tables as delineated in 29 CFR 1926.803.
6	11/29/1983 - 1926.803 - Work in compressed air and underground tunnelling.
7	11/16/1977 - 1926.803 - Positive identification of persons working underground in tunnels and shafts, caissons, cofferdams, compressed air tunnels.

#	Regulations
1	03/14/2001 - 1926.803 - Compressed air.