Location | Cover inches (millimeters) | |
For normal excavation | For rock excavation1 | |
Industrial, commercial, and residential areas | 36 (914) | 30 (762) |
Crossing of inland bodies of water with a width of at least 100 feet (30.5 meters) from high water mark to high water mark | 48 (1219) | 18 (457) |
Drainage ditches at public roads and railroads | 36 (914) | 36 (914) |
Deepwater port safety zones | 48 (1219) | 24 (610) |
Gulf of Mexico and its inlets in waters less than 15 feet (4.6 meters) deep as measured from mean low water | 36 (914) | 18 (457) |
Other offshore areas under water less than 12 ft (3.7 meters) deep as measured from mean low water | 36 (914) | 18 (457) |
Any other area | 30 (762) | 18 (457) |
1 Rock excavation is any excavation that requires blasting or removal by equivalent means.
49 C.F.R. §195.248