(a) Cuts and Fills. No land shall be graded, cut or filled so as to create a slope exceeding a vertical rise of one (1) foot for every two and one-half feet of horizontal distance between abutting lots, or between adjoining tracts of land, unless a retaining wall of sufficient height and thickness is provided to retain the graded bank, or other acceptable control measures are provided.
(b) Compaction of Fill. All fill outside the right of way shall be compacted to a density of ninety-eight percent (98%) dry density or greater, to within four (4) inches of finished grade.
(c) Retaining Walls. Retaining walls may be required whenever topographic conditions warrant or where necessary to retain fill or cut slopes within the right-of-way. Such improvements shall require the approval of the Municipal Engineer.