The OSHA Standard for Excavation and Trenching applies
to any man-made cut, cavity, trench, or depression in the
earth’s surface formed by earth removal. Excavations are
defined to include trenches, which are defined as narrow
underground excavation deeper than it is wide, and is no
wider than 15’. There are many hazards but most can be
placed into four categories:
• Underground utilities
• Confined space hazards
• Cave-ins
• Overhead power lines
Cave-‐ins are the most common hazard associated with
excavations. Cave-‐ins can be the result of unsafe work
habits, changes in weather that affect soil stability, and/or
vibrations caused by construction activity. Underground
utilities are of major concern if there is any possibility of
natural gas or electrical lines. You must always be alert for
changing conditions.
Pre-Excavation
• Call the national “Call Before You Dig” number 811 or
locally designated number to verify that utilities are
marked and the depth is verified before starting any
digging activities. (All personnel must know this has been
completed for their safety.)
• Wear appropriate personal protective equipment (PPE) as
required by the task being performed and as required per
OSHA regulations.
Occupied Excavation
The competent person needs to conduct a visual inspection
once the excavation has been opened. The definition of a
Competent Person is:
One who is capable of identifying existing and predictable
hazards in the surroundings or working conditions which
are unsanitary, hazardous, or dangerous to employees, and
who has authorization to take prompt corrective measures to
eliminate them.
Ensure that the following Best Practices are followed if the
excavation is to be occupied:
• No employee shall enter any excavation until necessary
protective systems are in place and the competent person
has determined that the excavation is safe to enter.
• Maintain a 2 foot lateral open area between the edge of
the excavation and any material, equipment, and spoil.
• Assure that proper sloping, benching, or shoring
techniques are utilized in excavations of 5 feet or greater
in depth. Be aware of different soil classification and use
the correct sloping for each classification. There are 4
types:
1 Solid Rock Vertical (90 Deg.)
2 Type A 3/4 : 1 (53 Deg.)
3 Type B 1: 1 (45 Deg.)
4 Type C 1 ½: 1 (34 Deg.)
• Check for and remove any accumulation of water in the
excavation.
• If the excavation is 4 feet or greater in depth, ensure a
fixed means of proper egress within a maximum lateral
travel distance of 25 feet.
• Ensure that the competent person inspects and documents
the excavation checklist at the beginning of each day, each
shift change, and after every change of weather (i.e. rain
storm)
• Protective systems for excavations of 20 feet or greater
in depth must be designed by a registered professional
engineer.
• Ensure that the public will be protected from all open
excavations.
Backfilling
• Ensure all personnel, tools, and foreign materials are clear
prior to backfilling.
• Comply with company specifications for backfilling.
• Ensure the protection and support of existing utilities and
structures.
THINGS YOU SHOULD DO IN THE WORKPLACE:
• Call the national “Call Before You Dig” number 811 or
other locally designated number to locate underground
utilities prior to starting work
• Keep material, equipment and spoils at least 2 feet back
from the edge of an excavation.
• Provide ladders, stairways, ramps or other means of egress
in all excavations that are 4 feet deep or greater.
• Position a means of egress within 25 lateral feet from
workers.
• Ensure the excavation is inspected by a competent person
prior to working.
THINGS YOU SHOULD NOT DO IN THE WORKPLACE:
• Do Not enter an excavation after a rain event until a
competent person has properly inspected it and water has
been removed.
• Do Not work on top of exposed utility pipes until they
have been properly backfilled.
• Never enter an excavation until a competent person has
inspected it.
to any man-made cut, cavity, trench, or depression in the
earth’s surface formed by earth removal. Excavations are
defined to include trenches, which are defined as narrow
underground excavation deeper than it is wide, and is no
wider than 15’. There are many hazards but most can be
placed into four categories:
• Underground utilities
• Confined space hazards
• Cave-ins
• Overhead power lines
Cave-‐ins are the most common hazard associated with
excavations. Cave-‐ins can be the result of unsafe work
habits, changes in weather that affect soil stability, and/or
vibrations caused by construction activity. Underground
utilities are of major concern if there is any possibility of
natural gas or electrical lines. You must always be alert for
changing conditions.
Pre-Excavation
• Call the national “Call Before You Dig” number 811 or
locally designated number to verify that utilities are
marked and the depth is verified before starting any
digging activities. (All personnel must know this has been
completed for their safety.)
• Wear appropriate personal protective equipment (PPE) as
required by the task being performed and as required per
OSHA regulations.
Occupied Excavation
The competent person needs to conduct a visual inspection
once the excavation has been opened. The definition of a
Competent Person is:
One who is capable of identifying existing and predictable
hazards in the surroundings or working conditions which
are unsanitary, hazardous, or dangerous to employees, and
who has authorization to take prompt corrective measures to
eliminate them.
Ensure that the following Best Practices are followed if the
excavation is to be occupied:
• No employee shall enter any excavation until necessary
protective systems are in place and the competent person
has determined that the excavation is safe to enter.
• Maintain a 2 foot lateral open area between the edge of
the excavation and any material, equipment, and spoil.
• Assure that proper sloping, benching, or shoring
techniques are utilized in excavations of 5 feet or greater
in depth. Be aware of different soil classification and use
the correct sloping for each classification. There are 4
types:
1 Solid Rock Vertical (90 Deg.)
2 Type A 3/4 : 1 (53 Deg.)
3 Type B 1: 1 (45 Deg.)
4 Type C 1 ½: 1 (34 Deg.)
• Check for and remove any accumulation of water in the
excavation.
• If the excavation is 4 feet or greater in depth, ensure a
fixed means of proper egress within a maximum lateral
travel distance of 25 feet.
• Ensure that the competent person inspects and documents
the excavation checklist at the beginning of each day, each
shift change, and after every change of weather (i.e. rain
storm)
• Protective systems for excavations of 20 feet or greater
in depth must be designed by a registered professional
engineer.
• Ensure that the public will be protected from all open
excavations.
Backfilling
• Ensure all personnel, tools, and foreign materials are clear
prior to backfilling.
• Comply with company specifications for backfilling.
• Ensure the protection and support of existing utilities and
structures.
THINGS YOU SHOULD DO IN THE WORKPLACE:
• Call the national “Call Before You Dig” number 811 or
other locally designated number to locate underground
utilities prior to starting work
• Keep material, equipment and spoils at least 2 feet back
from the edge of an excavation.
• Provide ladders, stairways, ramps or other means of egress
in all excavations that are 4 feet deep or greater.
• Position a means of egress within 25 lateral feet from
workers.
• Ensure the excavation is inspected by a competent person
prior to working.
THINGS YOU SHOULD NOT DO IN THE WORKPLACE:
• Do Not enter an excavation after a rain event until a
competent person has properly inspected it and water has
been removed.
• Do Not work on top of exposed utility pipes until they
have been properly backfilled.
• Never enter an excavation until a competent person has
inspected it.
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