Where the Board finds that practical difficulty or extraordinary
hardship, because of exceptional narrowness, shallowness, or shape
of the specific parcel or because of unusual topographic conditions
or other unusual physical condition of the specific parcel, may result
from strict compliance with these regulations, it may grant a variance
from the regulations in the specific case so that substantial justice
may be done and the public interest is secured, provided that such
variation will not have the effect of nullifying the intent and purpose
of the Master Plan or these regulations. In granting a variance, the
Board may require such conditions as will, in its judgment, secure
substantially the objectives of the subdivision regulations.