The Approving Authority, when acting upon applications for preliminary or minor subdivision approval and/or site plan approval, shall have the power to grant such exceptions from the design and performance standards of this chapter as may be reasonable and within the general purpose and intent of the provisions for subdivision/site plan review and approval if the literal enforcement of one or more provisions of this chapter is impracticable or will exact undue hardship because of peculiar conditions pertaining to the land in question.