A. Cuts. Cut slopes shall not exceed in steepness a 3:1 (horizontal to vertical) ratio unless recommended by a certified soils engineer and approved by the City Engineer. Slopes between 3:1 and 4:1 ratio shall receive an approved slope treatment such as dumped rip rap, grouted rip rap, or concrete. Slopes flatter than 4:1 may require a slope treatment such as hydroseeding, decomposed granite, or as determined by the City Engineer. Slopes flatter than 4:1 and located in the public right-of-way shall require a slope treatment such as hydroseeding, decomposed granite, or as determined by the City Engineer.
B. Fill. Fill slopes shall not exceed in steepness a 4:1 (horizontal to vertical) ratio. All fills shall receive an approved slope treatment such as hydroseeding, decomposed granite, or as determined by the City Engineer.
1. Ground Preparations. The ground surface shall be prepared to receive fill by removing vegetation, noncomplying fill, top soil and other unsuitable materials; scarify to provide a bond with new fill and where slopes are steeper than 15 percent and the height is greater than 5 feet, by benching into a competent material as determined by a certified soils engineering report and approved by the City Engineer.
2. Structural Fill Material. Detrimental amounts of organic material shall not be permitted in structural fills. Burial of tree stumps will not be allowed on any site other than an approved solid waste disposal site. No rock or similar material greater than 6 inches in diameter shall be placed in a structural fill. The City Engineer may permit placement of larger rock if the soils engineering report devises a method to continuously inspect placement and certify stability of rock disposal areas having no overlapping with physical improvements, and is a minimum of 5 feet below grade measured vertically.
3. Structural Fill Compaction. Structural fill will be compacted to a minimum of 95 percent of maximum density. The soils engineer shall certify all structural fills as meeting minimum bearing capacity for the intended use and meeting minimum compacted density of 95 percent.
4. Non-Structural Fills. Fill materials and landscape berms will be compacted to at least 90 percent maximum density by reasonable mechanical means.
(Ord. 743, passed 4-10-86; Am. Ord. 875, passed 1-10-91; Am. Ord. 1043, passed 9-11-97; Am. Ord. 2008-010, passed 5-8-08; Am. Ord. 2010-017, passed 9-23-10; Am. Ord. 2019-007, passed 11-14-19)