To the extent allowed by the Stormwater Management rules (N.J.A.C. 7:8), the Flood Hazard Area Control Act Rules (N.J.A.C. 7:13), and the Highlands Water Protection and Planning Act Rules (N.J.A.C. 7:38), new disturbances for projects or activities in the riparian zone established by this chapter may be allowed through the Zoning Board of Adjustment review and approval of a variance, provided the disturbance is proposed to be located on a preexisting lot (existing as of the effective date of this chapter) when there is insufficient room outside the riparian zone for the proposed use otherwise permitted by the underlying zoning; there is no other reasonable or prudent alternative to placement in the riparian zone, including obtaining variances from setback or other requirements that would allow conformance with the riparian zone requirements; and upon proof by virtue of submission of appropriate maps, drawings, reports and testimony, that the disturbance is:
A. Necessary to protect public health, safety or welfare;
B. To provide an environmental benefit;
C. To prevent extraordinary hardship on the property owner peculiar to the property; or
D. To prevent extraordinary hardship, provided the hardship was not created by the property owner, by not allowing a minimum economically viable use of the property based upon reasonable investment.