"Replacement structure" when applied to any structure except a stream crossing that is subject to Env-Wt 900 means a new structure that takes the place of an existing legal structure, that is the same kind of structure in the same or a more conforming location, having the same or smaller surface area and, if a docking structure, the same number or fewer boatslips, such that in all material aspects, the new structure is no more impacting to the environment or abutting properties than the original structure.
N.H. Admin. Code § Env-Wt 104.06