17.154.170 Fills or embankments.
(1) General. Unless otherwise recommended in the approved soils engineering report, fills shall conform to the provisions of this section. These provisions shall not apply to minor fills not intended to support structures, and which are less than four feet in height, when such fills do not pose a threat to adjoining property.
(2) Preparation of Ground. Fill slopes shall not be constructed on natural slopes steeper than one unit vertical in two units horizontal (50 percent slope).
(3) Fill Material.
(a) Detrimental amounts of organic material shall not be permitted in fills. Except as permitted by the city, no rock or similar irreducible material with a maximum dimension greater than 12 inches shall be buried or placed in fills.
(b) Exception. The city may permit placement of larger rock when the soils engineer properly devises a method of placement, and continuously inspects its placement and approves the fill stability. The following conditions shall also apply:
(i) Prior to issuance of the grading permit, potential rock disposal areas shall be delineated on the grading plan;
(ii) Rock sizes greater than 12 inches in maximum dimension shall be 10 feet or more below grade, measured vertically; and
(iii) Rocks shall be placed so as to assure filling of all voids with well-graded soil.
(c) Compaction. All fills intended to support structures or private roads shall be compacted to a minimum of 95 percent of maximum density. All fills within public or private rights-of-way shall be compacted in accordance with city specifications.
(d) Slope. The slope of fill surfaces shall be no steeper than is safe for the intended use. Fill slopes shall be no steeper than one unit vertical in two units horizontal (50 percent slope). (Ord. 1499 § 10 (Exh. H), 2021).