Start with the actual work
A dock repair, a new pier, and a replacement bulkhead can follow different review paths. Begin with a measured description of what is there and what will change. Record the existing footprint, the waterbody, and whether the work is in a manmade lagoon or a natural waterway. A contractor can help assemble the scope, but the site and proposed work determine the approvals.
New Jersey's Division of Land Resource Protection lists bulkheads and docks or piers as separate common projects. Both pages explain that activity in regulated areas may need more than one authorization. Treat an old permit, a neighbor's project, or a sales description as background. It does not establish the path for your parcel.