The statement is true
The call to 811 allows affected facility operators to locate and mark their underground facilities in the area in which someone needs digging. Call 811 at least a few days before you start any digging project. Whether you are planning to do it yourself or hire a professional, smart digging means calling 811 before each job. But if one has called once and doing digging at the same location then there is no need to call 811 again.
