Contaminated land practitioners think of a document that has a much wider scope. The DoWCoP relates specifically to the reuse of excavated materials and demonstrating how the reuse has achieved or furthered the objectives relating to that use.
In relation to the DoWCoP it is anticipated that it is a subset, or specific section, of a verification report.
For the Design Statement route (where contamination is not suspected) it may only cover the reuse of excavated materials and nothing else. It is a new requirement for these types of projects (it is anticipated that it will be a very small document).