The first issue is the permeability of the soil under the trench. Even though the first few feet of soil strata are engineered to allow water to flow through quickly, the soil type around the trench ...

This course covers the OSHA Excavation Standard and safety and health aspects of excavation and trenching ... introduction of various types of shoring (wood timbers and hydraulic), soil classification ...

This course covers the OSHA Excavation Standard and safety and health aspects of excavation and trenching ... introduction of various types of shoring (wood timbers and hydraulic), soil classification ...