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  1. Are Trenches & Other Excavations Permit-required Confined Spaces?

  2. Confined Spaces in Construction - FAQ | Occupational Safety

  3. When Is a Trench a Confined Space? - United Rentals

  4. 29 CFR Part 1926 Subpart AA -- Confined Spaces in Construction

  5. eCFR :: 29 CFR 1910.146 -- Permit-required confined spaces.

  6. Confined Spaces Definition: What Are Confined Spaces?

  7. OSHA Fact Sheet: Confined Spaces in Construction: Pits

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