If at any time before or during the construction of
the required improvements, it appears to be necessary or desirable
to modify the required improvements, the inspecting official is authorized
to approve minor modifications due to unforeseen circumstances, such
as encountering hidden outcrops of bedrock, natural springs, etc.
The inspecting official shall issue any approval under this section
in writing and shall transmit a copy of the approval to the Board.
Revised plans shall be filed with the Town. For major modifications,
such as relocation of rights-of-way, property boundaries, changes
of grade by more than 1%, etc., the subdivider shall obtain permission
to modify the plans from the Board.