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Dig a hole in the ground and you have made an excavation. Excavations can be any size: wide, narrow, deep, or shallow. A trench is an excavation, too, but it is not more than 15 feet wide at the bottom. And, if you install forms or other structures in an excavation that reduce its width to less than 15 feet, measured at the bottom, the excavation is also considered a trench.
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Call 811 before you dig - Oregon Utility Notification Center
Technical Manual, Section V: Construction Operations,
Chapter 2: Excavations: Hazard Recognition in Trenching and Shoring
Excavations – safe practices for small business owners and contractors.
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