California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 17 - Mine Safety Orders
Article 12 - Ground Control
Surface
Section 6986 - (3-2). Overburden

(a) No person shall be permitted under a face or bank where stripping operations constitute a hazard.

(b) Where employees are endangered by materials rolling or sliding down the slopes above a pit, such employees shall be removed from the danger area or shall be protected by barriers, baffle boards, screens, or other devices that afford equivalent protection.

(c) Loose, unconsolidated material shall be stripped for a safe distance, but in no case less than 10 feet from the top of pit or quarry walls, and the loose, unconsolidated material shall be sloped to the angle of repose.