1. “Occupational Safety and Health Standards, Subpart J - General Environmental Controls, Permit-Required Confined Spaces,” Code of Federal Regulations, Title 29, Part 1910.146. 2013.
2. “Safety and Health Regulations for Construction, Subpart S - Underground Construction, Caissons, Cofferdams, and Compressed Air,” Code of Federal Regulations, Title 29, Part 1926. 800. 2013.
3. “Safety and Health Regulations for Construction, Subpart C - General Safety and Health Provisions, Safety Training and Education,” Code of Federal Regulations, Title 29, Part 1926.21. 2013.
4. “Occupational Safety and Health Standards, Subpart R - Special Industries, Telecommunications,” Code of Federal Regulations, Title 29, Part 1910.268. 2013.
5. Carbon Monoxide Poisoning and Death After the Use of Explosives in a Sewer Construction Project