Injury Illness Prevention Plan - Flipbook - Page 185
Health and Safety Program Manual
Teamwrkx
Construction, Inc.
Issue Date: 10/16/23
Revision Date: 10/16/23
Trenching and Excavation
Reference: A-15
scope activities. The awareness program shall include information regarding safe access and egress and
protective measures associated with trenching.
A competent person shall be placed in charge of all excavations. Underground utilities must be located and
marked before excavation begins. Before digging, driving equipment into the ground, or engaging in earth
moving activities are conducted, the appropriate one-call center will be contacted. Workers are not allowed in
the excavation while heavy equipment is digging.
Inspections
The competent person shall conduct inspections:
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Daily and before the start of each shift by using the DAILY EXCAVATION CHECKLIST found at the
end of this chapter.
As dictated by the work being done in the trench.
After every rainstorm.
After other events that could increase hazards, such as snowstorm, windstorm, earthquake,
dramatic change in weather, etc.
When fissures, tension cracks, sloughing, undercutting, water seepage, bulging at the bottom, or
other similar conditions occur.
When there is a change in the size, location, or placement of the spoil pile.
When there is any indication of change or movement in adjacent structures.
(For excavations 4 feet or greater in depth, a trench inspection form shall be filled out for each inspection.) If
problems are found, provisions should be made for immediate personnel removal.
Soil Types:
Type A - Most stable: clay, silty clay, and hardpan (resists penetration). No soil is Type A if it is fissured, is subject
to vibration of any type, has previously been disturbed, or has seeping water.
Type B - Medium stability: silt, sandy loam, medium clay, and unstable dry rock; previously disturbed soils unless
otherwise classified as Type C; soils that meet the requirements of Type A soil but are fissured or subject to
vibration.
Type C - Least stable: gravel, loamy sand, soft clay, submerged soil or dense, heavy unstable rock, and soil from
which water is freely seeping.
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