(a) Fill Location. Fill slopes shall not be constructed on natural slopes steeper than three to one unless approved by the Department of Public Works.

(b) Preparation of Ground. The ground surface shall be prepared to receive fill by removing vegetation, noncomplying fill, topsoil and other unsuitable materials and scarifying to provide a bond with the new fill.

(c) Fill Material. Detrimental amounts of organic material shall not be permitted in fills. Except as permitted, no rock or similar irreducible material with a maximum dimension greater than 12 inches shall be buried or placed in fills. The Development Coordination Office may permit placement of larger rock when a soils engineer properly devises a method of placement, continuously inspects its placement and approves the fill stability.

(d) Compaction. All fills shall be compacted to a minimum of 90 percent of maximum density tested by the standard Proctor method unless specifically exempted from this requirement by the Department of Public Works.

(e) Slope. The slope of fill surfaces shall be no steeper than is safe for the intended use. Fill slopes shall be no steeper than three horizontal to one vertical unless approved by the Department of Public Works. (Ord. 16432 § 6(4), 3-10-92. Code 1995 § 66-124.)