A. The faces of cut and fill slopes and the project site shall be prepared and maintained to control against erosion in accordance with this section and Sections 15.12.350 and 15.12.360. Where cut slopes are not subject to erosion due to the erosion-resistant character of the materials, such protection may be omitted upon approval by the city official.
B. Where necessary, temporary and/or permanent erosion control devices such as desilting basins, check dams, riprap or other devices or methods, as approved by the city official, shall be employed to control erosion and provide safety during the rainy season from October 15th to April 15th.
C. No grading work in excess of two hundred (200) cubic yards will be allowed between October 15th and April 15th on any single grading site under permit unless an erosion control system has been approved or waived by the city official.
D. Paved streets, sidewalks and other improvements shall be maintained in a neat and clean condition free of loose soil, construction debris and trash. Street sweeping or other equally effective means shall be used on a regular basis to prevent storm flows from carrying sediment and debris outside the project boundaries. Watering shall not be used to clean streets except for fine material not otherwise removed by sweeping or other mechanical means.
E. The civil engineer or other qualified individual who prepared the grading plan and designed the erosion control devices shall be responsible for inspection and modification of the devices, as necessary, during the rainy season.
F. Desilting facilities shall be provided at drainage outlets from the graded site.
G. Desilting basins shall be designed to provide a minimum desilting capacity equal to the current city standards.
H. Desilting basins shall be constructed around the perimeter of projects whenever feasible when it provides improved maintenance access from paved roads during wet weather.
I. Desilting basins constructed of compacted earth shall be compacted to a relative compaction of ninety (90) percent of maximum density. A soil engineering report, prepared by the soil engineer, which includes the type of field testing performed, location and results of testing shall be submitted to the city official for approval upon completion of the desilting basins.
J. Equipment and workers for emergency work shall be made available at all times during the rainy season. Necessary materials shall be available on-site and stockpiled at convenient locations to facilitate rapid construction of temporary devices when rain is imminent.
K. Erosion protection shall consist of effective planting of all slopes in excess of five feet high unless otherwise approved by the city official. Slopes exceeding fifteen (15) feet high may require an adequate sprinkler system, as determined by the city official. Protection for the slopes shall be installed as soon as practicable which may be prior to rough grade approval. Effective planting shall be installed, fully germinated and effectively cover the required slopes prior to final approval unless otherwise approved by the city official.
L. The erosion control provisions shall take into account drainage patterns during the current and future phases of grading throughout the rainy season.
M. All removable protective devices shown shall be in place at the end of each working day when the five-day rain probability forecast exceeds forty (40) percent.
N. Graded areas around the tract perimeter must drain away from the face of slopes at the conclusion of each working day. (Ord. 48, 1990)