(a) In order to prevent both solid erosion and sedimentation, a soil erosion and sedimentation control plan shall be required whenever a development will involve any clearing, grading, transporting, or other form of disturbing land by the movement of earth.
(b) Sediment deposition caused by accelerated stormwater runoff over a development site or by accelerated erosion due to the sloughing or sliding of surface soil that has been exposed by grading, dumping, stockpiling or any other excavation-related earth disturbances shall be retarded (whenever possible) and confined to within the boundaries of the development site.
(c) The accumulative monthly predicted amounts of gross soil loss anticipated from sheet and rill erosion shall be abated to within an average annual rate of fifteen (15) tons per acre during the first year, ten (10) tons per acre for any year thereafter of site development activities and to within five (5) tons per acre per year after site development is completed. The Universal Soil Loss Equation as referenced within the U.S. Department of Agriculture, Soil Conservation Service (SCS), Water Management and Sediment Control for Urbanizing Areas, (Washington, DC; U.S. Government Printing Office, June, 1978) or other approved methods shall be used to predict average annual rates of gross soil loss by month from a development site.
(d) Specifically, the following protection shall be provided for all disturbed areas: minimize velocities of water runoff, maximize protection of disturbed areas from stormwater runoff, and retain sedimentation within the development site as early as possible following disturbances. A list of major problem areas for erosion and sedimentation control follows. For each one, the purpose(s) of requiring control is described. Soil erosion and sedimentation control measures for all such areas shall be provided with a view toward achieving the specific purpose listed below for which a control plan is required:
(1) Erodable Slopes: Prevent detachment and transportation of soil particles from slope.
(2) Streams, stream beds, stream banks, bodies of water, lake shorelines: prevent detachment and transportation of soil particles.
(3) Drainageways: prevent detachment and transportation of soil particles (which would otherwise deposit in streams, bodies of water, of wetlands); promote deposit of sediment loads (traversing these areas) before these reach bodies of water.
(4) Land adjacent to streams, ponds, lakes, and wetlands: prevent detachment and transportation of soil particles.
(5) Enclosed drainage structure: prevent sedimentation in structure, erosion at outfall of system, and deposit of sediment loads within system or beyond it.
(6) Large flat surface areas (unpaved): prevent detachment of soil particles and their off-site transportation.
(7) (Impervious) Pervious Surfaces: prevent the detachment and transportation of soil (in response to an increase in the rate and/or volume of runoff of the site or its concentration caused by impervious surfaces).
(8) Borrow and Stockpile Areas: divert runoff from the face of slopes which are exposed in the excavation process; convey runoff in stabilized channels to stable disposal points; leave borrow areas and stockpiles in stable condition.
(9) Adjacent Properties: prevent their erosion and/or being deposited with sediment.
(e) The Appendix presents graphic examples of erosion and sedimentation control measures and indicates by asterisk, when any such measure may effectively control the problem area. One or more of each such asterisked measure shall suffice to comply with the requirements of this section.) (Ord. 26-03. Passed 11-17-03.)