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1926.651(i) Stability of Adjacent Structures
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Where the stability of adjoining buildings, walls, or other structures is endangered by excavation operations, support systems such as shoring, bracing, or underpinning shall be provided to ensure the stability of such structures for the protection of employees.
Excavation below the level of the base or footing of any foundation or retaining wall that could be reasonably expected to pose a hazard to employees shall not be permitted except when:
A support system, such as underpinning, is provided to ensure the safety of employees and the stability of the structure; or
A registered professional engineer has approved the determination that the structure is sufficently removed from the excavation so as to be unaffected by the excavation activity; or
A registered professional engineer has approved the determination that such excavation work will not pose a hazard to employees.
The excavation is in stable rock; or
Sidewalks, pavements, and appurtenant structure shall not be undermined unless a support system or another method of protection is provided to protect employees from the possible collapse of such structures.
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