Commercial and industrial properties are required to take measures to assure that sediment is not transported from the site by a storm event of 25-year frequency or less and that the following principles will be applicable in the area to be developed:
(A) Site design should be related to the topography and soils of the site so as to create the least potential for erosion. Areas of steep slopes where high cuts and fills may be required should be avoided wherever possible and natural contours should be followed as closely as possible.
(B) Natural vegetation should be retained and protected wherever possible. Areas immediately adjacent to natural watercourses should be left undisturbed wherever possible.
(C) The smallest practical area of land should be exposed for the shortest practical time during construction.
(D) Sediment basins, debris basins, de-silting basins, or silt traps or filters should be installed and maintained to remove sediment from run-off waters from land undergoing development.
(E) The selection of erosion and sedimentation control measures should be based on assessment of the probable frequency of climatic and other events likely to contribute to erosion, and on evaluation of the risks, costs and benefits involved.
(F) In the design of erosion control facilities and practices, aesthetics and the requirements of continuing maintenance should be considered.
(G) Provision shall be made to accommodate the increased run-off caused by changed soil and surface conditions during and after development. Drainageways should be designed so that their final gradients and the resultant velocities of discharges will not create additional erosion, and should be protected against erosion and sedimentation during development.
(H) Permanent vegetation and structures should be installed as soon as practical during construction.
(I) During construction of public improvements, measures shall be taken to control erosion and sedimentation to ensure that sediment will not be transported from the site by a storm event of 25- year frequency or less. The erosion and sediment control plan shall include measures to stabilize and protect disturbed areas, keep runoff velocities low, retain sediment on site and protect disturbed areas from runoff. The location, type and configuration of controls such as swales, berms, dams, sediment basins, and release mechanisms shall be included with the construction plans.
(J) Temporary or permanent soil stabilization measures, whichever is applicable, shall be applied within 15 days after final grading to all areas where the soil has been disturbed or the vegetative cover removed. Seeding mixtures and rates, types of sod, method of seed bed preparation, expected seeding dates, type and rate of lime and fertilizer application and kind of quantity of mulch of temporary and permanent vegetative control measures shall be included with the construction plans.
(Ord. 10-09-01, passed 10-09-2001
; Ord. 21-04, passed 3-8-2021
)