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OSHA Letters of Interpretation for Subpart P Excavation Standard
01/09/1991
- Clarification
of Standards
01/10/1994
- Soil classification
01/16/2003
- Registered
professional engineer approval requirements for manufactured
trench protection systems deeper than 20 feet
02/19/1993
- Plywood as
a substitute for meeting the standard
02/21/1986
- Clarification
of Competent and Qualified Person, as it Relates to Subpart
P
04/15/1992
- Use of plywood
for shoring and support systems in trenches and excavations
05/11/2004
- Evaluation
of the use of aluminum forms as an exit route from trench excavations
05/21/1992
- Design of
Protective Systems in Trenches
06/05/1991
- Testing of
type C soil is not necessary if employees are adequately protected
06/15/1992
- Soil testing
for excavations and confined spaces
06/24/2002
- Clarification
concerning fall protection and vertical walled trenches with
depth of 6 feet or greater and use of controlled access zones
08/05/1992
- Competent
person responsibilities at excavations
08/10/2000
- Trench shield
must extend 18" above excavation walls when below grade
08/30/1991
- Placement
of vertical hydraulic shoring members; Bending strength of plywood;
use of non-structural sheeting
09/07/1995
- Concerns with
the OSHA June 30 memorandum concerning the application of 29
CFR 1926.652 to house foundation/basement excavations
09/21/2001
- Clarification
of utility "owner" as used in the Safety and Health
Standards for Excavations, Underground Installations
09/23/1993
- Confined space
standard for general industry
10/01/1991
- Classification
and subsequent designs may be used if they have been approved
by a registered professional engineer
10/01/1991
- Manufacturer's
Tabulated Data in the design and application of trench safety
systems
10/15/1999
- Excavations
may be shored with wooden shoring
10/20/1999
- Trench shields
must be installed to prevent lateral movement in a collapse
10/23/2003
- Use of hydro-vacuum
excavation equipment and other acceptable means to locate underground
utility installions
10/29/1991
- Stacking trench
boxes in trenches
11/14/2003
- Permissibility
of installing a trench shield so that the top is flush with
the surface
11/18/1975
- Clarification
of excavations, trenching, and shoring standards
11/19/1991
- Requirement
for Air Sampling in trenches
12/22/2003
- Registered
professional engineer approval requirements for combination
trench shield and sloping system trenches with a depth greater
than 20 feet
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