Site plan approval from the Planning Board shall be required to place, expand, or alter or replace any retaining wall or bulkhead; in addition, site plan approval is required for any filling, grading, lagooning, dredging, ditching and/or excavating within the district where such activities affect an area greater than 1,000 square feet. However, replacement of any septic tank or pipe(s) in an existing septic system that disturbs greater than 1,000 square feet may be permitted through the Building Department only and does not need Planning Board site plan approval. Docks are permitted uses that require a building permit as per Attachment 7.