Section 15.106 - Landscape Position(1) The topography of the proposed disposal area shall be identified and recorded on the evaluation form. Particular attention shall be given to recording features which may adversely affect the functioning of an on-site system. These include: (a) bedrock outcrops or areas with many stones and/or boulders;(b) steep slopes (greater than 3:1, horizontal to vertical) exhibiting signs of unstable soil such as landslide scars, slump blocks, tree trunks or shrubs bending downslope;(c) highly disturbed ground as indicated by such features as remnants of foundations or pavements or buried construction debris;(d) low-lying coastal areas exhibiting signs of tidal inundation or tidal marsh vegetation;(e) low-lying inland areas exhibiting signs of influence of surface water runoff, ponding or freshwater wetland vegetation;(f) flat low-lying areas adjacent to surface water bodies and streams; and(g) the boundary of a velocity zone.