(A) The faces of cut and fill slopes and the project site shall be prepared and maintained to control against erosion. 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 Director of Public Works.
(B) Where necessary, temporary and/or permanent erosion control devices such as desilting basin, check dams, cribbing, rip rap, or other devices or methods as approved by the Director of Public Works, shall be employed to control erosion and provide safety during the rainy season from October 15 to April 15.
(C) Desilting basins constructed of compacted earth shall be compacted to a relative compaction of ninety percent of maximum density. A soil engineering report prepared by the soil engineer including the type of field testing performed, location and results of testing shall be submitted to the Director of Public Works for approval upon completion of the desilting basins.
(D) Desilting facilities shall be provided at drainage outlets from the graded site, and shall be designed to provide a desilting capacity capable of containing the anticipated run-off for a period of time adequate to allow reasonable settlement of suspended particles.
(E) Desilting basins shall be constructed around the perimeter to projects, whenever feasible, when it provides improved maintenance access from paved roads during wet weather.
(F) The erosion control provisions shall take into account drainage patterns during the current and future phases of grading throughout the rainy season.
(G) Erosion protection shall consist of effective planting of all slopes in excess of five feet in height unless otherwise approved by the Director of Public Works.
(H) Planting of the slopes shall be done as soon as practicable, which may be prior to rough grade approval. Effective plantings shall be installed, fully germinated and effectively cover the required slopes.
(I) The permittee or owner shall be responsible for control or erosion on all areas of the project until acceptance of the completed project. This responsibility extends to completed and occupied lots.
(J) Equipment and workers for emergency work shall be made available at all times during the rainy season. Necessary material shall be available on-site and stockpiles at convenient locations to facilitate rapid construction of temporary devices when rain is imminent.
(K) All removable protective devices shown shall be in place at the end of each working day when the five-day rain probability forecast exceeds 40%.
(L) If the owner does not provide the required installation or maintenance of erosion control structures, the Director of Public Works may issue contracts for such work and charge the cost of this work to the cash deposits or other instruments implemented for this work. No additional work on the project except erosion control work may be performed until the fill amount drawn from the deposit is restored by the developer.
(Ord. 1449, passed 10-19-05)