[1] 2014 Pit and Quarry Operations Handbook,
Chapter 10, page 145

[2] Occupational Safety and Health Administration (OSHA), “§ 1926.1412 Inspections”, Dec, 2023. https://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-CC/section-1926.1412