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Detected Outline
Clauses: 4
Tables: 2
Figures: 1
Checklists: 0
Tables: 2
Figures: 1
Checklists: 0
1.6.3
If excavation work interrupts the natural drainage of surface water (e.g.,
If excavation work interrupts the natural drainage of surface water (e.g.,
1.6.4
Excavations that have been subject to runoff (e.g., from a rain storm) shall
Excavations that have been subject to runoff (e.g., from a rain storm) shall
1.7.1
Protective Systems
Protective Systems
1.7.2
Excavation Boxes and Trench Shields (see Figure 1.9)
Excavation Boxes and Trench Shields (see Figure 1.9)
Page Text
1.6.3 If excavation work interrupts the natural drainage of surface water (e.g.,
streams), then diversion ditches, dikes or other suitable means shall be used
to prevent surface water from entering the excavation and to provide
adequate drainage of the area adjacent to the excavation.
1.6.4 Excavations that have been subject to runoff (e.g., from a rain storm) shall
be inspected before use by the excavation competent person in accordance
with Section 1.13.
1.7.1 Protective Systems
A. Suitable shoring shall be installed, or the sides benched or sloped back to a
safe angle, for all excavations 1.2 m (4 ft) deep or greater, or for soil piles over 1.5 m (5 ft) high. Refer to Table 1.3 and Figures 1.1 to 1.8 of this
chapter for details.
B. The determination of slope angle, benches or choice and design of shoring
shall be based on an evaluation by the excavation competent person of
pertinent factors, such as:
• Type of soil (i.e., stable rock, Type A, B or C soil ) (see Appendix A,
Table 1.2 and Glossary).
• Depth of excavation.
• Possible variation in water conte nt of the soil while the excavation is
open.
• Anticipated changes in soil from exposure to air, sun or water.
• Loading imposed by structures, equipment, overlying material or
stored material.
• Vibrations from equipment, blasting, traffic or other sources.
C. Since any previously disturbed soil is considered to be Type C soil,
excavations in previously disturbed soil (e.g., fill) shall not be sloped at an
angle greater than 1½ horizontal to 1 vertical, measured from the
horizontal.
D. Shoring materials shall be in good condition.
E. Workers shall be trained to look for signs of shoring or sidewall bulge,
surface cracking, sand penetration from behind shoring or cracked shoring,
which can be a warning sign of a collapse that is about to happen.
1.7.2 Excavation Boxes and Trench Shields (see Figure 1.9)
A. Portable excavation boxes or trench shields may be used for the protection
of personnel instead of shoring, benching or sloping.
streams), then diversion ditches, dikes or other suitable means shall be used
to prevent surface water from entering the excavation and to provide
adequate drainage of the area adjacent to the excavation.
1.6.4 Excavations that have been subject to runoff (e.g., from a rain storm) shall
be inspected before use by the excavation competent person in accordance
with Section 1.13.
1.7.1 Protective Systems
A. Suitable shoring shall be installed, or the sides benched or sloped back to a
safe angle, for all excavations 1.2 m (4 ft) deep or greater, or for soil piles over 1.5 m (5 ft) high. Refer to Table 1.3 and Figures 1.1 to 1.8 of this
chapter for details.
B. The determination of slope angle, benches or choice and design of shoring
shall be based on an evaluation by the excavation competent person of
pertinent factors, such as:
• Type of soil (i.e., stable rock, Type A, B or C soil ) (see Appendix A,
Table 1.2 and Glossary).
• Depth of excavation.
• Possible variation in water conte nt of the soil while the excavation is
open.
• Anticipated changes in soil from exposure to air, sun or water.
• Loading imposed by structures, equipment, overlying material or
stored material.
• Vibrations from equipment, blasting, traffic or other sources.
C. Since any previously disturbed soil is considered to be Type C soil,
excavations in previously disturbed soil (e.g., fill) shall not be sloped at an
angle greater than 1½ horizontal to 1 vertical, measured from the
horizontal.
D. Shoring materials shall be in good condition.
E. Workers shall be trained to look for signs of shoring or sidewall bulge,
surface cracking, sand penetration from behind shoring or cracked shoring,
which can be a warning sign of a collapse that is about to happen.
1.7.2 Excavation Boxes and Trench Shields (see Figure 1.9)
A. Portable excavation boxes or trench shields may be used for the protection
of personnel instead of shoring, benching or sloping.