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| Trenches and excavations must be sloped or shored if they are over 1.22 metres or 4 feet in depth. Trench walls should be sloped to a stable face. The slope must have a ratio of 3/4 (0.75) horizontal to 1 vertical or less. |
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| 1. Sloping The Trench Walls. 2. Trench Shoring In Compact Soil. 3. Trench Shoring In Loose Soil. Basic Construction And Carpentry Techniques Home |
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