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# Directives
1 1990 - 02/20/1990 - CPL 02-00-087 [CPL 2.87] - Inspection Procedures for Enforcing the Excavation Standard, 29 CFR 1926, Subpart P
# Federal Registers
1 2015 - 05/04/2015 - Confined Spaces in Construction; Final Rule - 80:25365-25526
2 1989 - 10/31/1989 - Excavations; Construction; Trenching; Shoring; Sloping; Benching;Final Rule - 54:45894-45991
3 1988 - 02/23/1988 - Excavation - 53:5280-82
4 1987 - 04/15/1987 - Excavation - 52:12288-339
# Standard Interpretations
1 2004 - 09/30/2004 - Permissibility of using average excavation depth to determine protective system requirements for the excavation.
2 2003 - 01/16/2003 - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
3 2001 - 09/21/2001 - Clarification of utility "owner" as used in the Safety and Health Standards for Excavations, Underground Installations.
4 2000 - 08/10/2000 - Trench shield must extend 18" above excavation walls when below grade.
5 1991 - 10/29/1991 - Stacking trench boxes in trenches.
6 1991 - 10/01/1991 - Classification and subsequent designs may be used if they have been approved by a registered professional engineer.
7 1991 - 10/01/1991 - Manufacturer's Tabulated Data in the design and application of trench safety systems.
8 1991 - 06/05/1991 - Testing of type C soil is not necessary if employees are adequately protected.
# Regulations (Standards - 29 CFR)
1 1926.650 - Scope, application, and definitions applicable to this subpart.

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