Assertion: excavation | /r/AtLocation | stable rock
Facets:
Source sentences:
text: The OSHA standard for trenching and excavation requires protective systems for trenches that are 5 feet or deeper, unless the excavation occurs in stable rock.
text: CFR 1926.650-652, Subpart P – requires protective systems for trenches that are 5 feet or deeper, unless the excavation occurs in stable rock.