9.05.120 Compaction of fills.
A. Fill slopes shall be compacted as necessary for safety; to prevent the saturation, adverse settlement, slipping or erosion of the fill and to achieve a stable slope. Wherever possible, compaction shall not be so dense that it precludes planting on the slope. Where compaction is required it shall be to a minimum of ninety percent compaction and made under supervised grading. The city engineer may specify the maximum thickness of the layers of fill to be compacted.
B. Fills shall be compacted, inspected and tested in accordance with the following provisions:
1. the space over which fills are to be made shall first be cleared of all trash, brush, trees, stumps, timber or debris and shall be scarified;
2. all filling shall be done with good sound earth, gravel or materials approved by the city engineer;
3. when an existing fill is to be widened or a new fill is to be made on a hillside, the new material shall be bonded to the old by plowing deep longitudinal furrows, or by removing top soil and vegetation and by compacting the fill upon a series of terraces;
4. all exposed fill slopes shall be protected immediately upon completion with landscaping, an approved sprinkler system or other erosion control devices approved and considered necessary by the city engineer;
5. in addition to the inspection of fills by the city engineer, the city engineer may require that a written report in duplicate be submitted by a soils engineer certifying the results of tests of the fill at selected stages. If favorable conditions exist, the city engineer may by prior approval waive requirements for supervision of soil testing. If the fill is to support buildings, structures or roadways, the city engineer may require the report to include recommendations on bearing capacities. [BC 9.05.120, amended by Ordinance No. 3487, 1/14/86; amended by Ordinance No. 4249, 4/7/03]