Where the Planning 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 this chapter, it may grant
a variance from the regulations in the specific case so that substantial
justice may be done and the public interest secured, provided that
such variation will not have the effect of nullifying the intent and
purpose of the Comprehensive Plan or this chapter. In granting a variance,
the Planning Board may require such conditions as will, in its judgment,
secure substantially the objectives of this chapter.