| The pavement laid was bitulithic and the subgrade was an old macadam road built by the County. |
| Depending on various factors, you might need to place a layer of base material on top of the subgrade. |
| The data extraction point is located on the top of the upper subgrade layer beneath one side of the rails. |
| Grubbing for road approaches should only be done immediately prior to subgrade construction. |
| In the subgrade telephone and telegraph ducts east of the Manhattan Shaft, much trouble was caused by grout in the ducts. |
| Heavy, muddy soil makes life tough for road builders, because roads need a reliable subgrade. |
