The Board of Supervisors may grant a modification
of one or more of the provisions of this chapter when literal enforcement
thereof will be unreasonable, will cause undue hardship because of
peculiar conditions pertaining to the land in question, or when an
alternative standard can be demonstrated to provide equal or better
results; provided, that such modification will not be contrary to
the public health, safety and welfare and that the purpose and intent
of this chapter is observed.