For any development, enlargement or site alteration on a Tier II site, the City Planning Commission may authorize variations in the grading controls set forth in Section 105-34.

In order to grant such authorization, the Commission shall find that:

(a)        the development, enlargement or site alteration is not feasible without such modifications, or that the modifications will permit a development, enlargement or site alteration that satisfies the purposes of this Chapter;

(b)        such modification is the least modification required to achieve the purpose for which it is granted;

(c)        the modification has minimal impact on the existing natural topography and vegetation and blends harmoniously with it;

(d)        the modification will not disturb the drainage pattern and soil conditions of the area;

(e)        the modification does not impair the essential character of the surrounding area; and

(f)        the benefits to the surrounding area from the modification outweigh any disadvantages that may be incurred thereby in the area.