When the excavation exceeds 10 feet. Whenever an excavation is intended
to be, or shall be, carried to the depth of more than 10 feet below
the curb, the person causing such excavation to be made shall at all
times, if afforded the necessary license to enter upon the adjoining
land, and not otherwise, at his own expense, preserve and protect
from injury any wall, building or structure, the safety of which may
be affected by said excavation, and support the same by proper foundations,
whether said wall, building or structure is down more or less than
10 feet below the curb. If the necessary license is not accorded to
the person making such excavation, then it shall be the duty of the
owner refusing to grant such license to make such wall, building or
structure safe and to support the same by proper foundations; and,
when necessary for that purpose, such owner shall be permitted to
enter upon the premises where such excavation is to be made.