12.12.070 Erosion and sedimentation plan.
In the event that any developer shall intend to denude or recontour any land proposed to be subdivided, by means of grading, excavation or the removal of or destruction of the natural topsoil, trees, or other vegetative covering thereof, a plan for erosion and sedimentation control shall be submitted to the city manager for approval prior to any recontouring or denudation being done unless there has been prior determination by the platting authority that such a plan is not necessary. Such plans shall contain adequate measures for control of erosion and siltation, where necessary, using the guidelines and policies contained herein. These plans shall be reviewed by the city manager and, if approved, shall be followed as the plans indicate. If the measures required to control erosion and siltation construction are necessary, such construction shall be a part of the street improvement agreement. The following control measures should be used for an effective erosion and sediment control plan:
A. The smallest practical area of land should be exposed at any one time during development.
B. When land is exposed during development, the exposure should be kept to the shortest practical period of time.
C. Sediment basins (debris basins, desilting basins or silt traps) should be installed and maintained to remove sediment from runoff waters from land undergoing development.
D. Provisions should be made to effectively accommodate the increased runoff caused by changed soil and surface conditions during and after development.
E. Groundcover should be replaced as soon as practical in the development.
F. The development plan should be fitted to the topography and soil conditions so as to create the least erosion potential.
G. Wherever feasible, natural vegetation should be retained and protected.
H. All slopes within a subdivision resulting from cut and fill operations shall not exceed a maximum slope of 50 percent unless a lesser slope is deemed necessary by the city manager due to soil conditions. If slopes of greater than 50 percent are desired, such slopes will be supported by a retaining structure approved by the city. (Ord. 255 § 3, 1982)