(A) Scope. Clearing and grading activities affecting greater than one acre, and all activities affecting waterway crossings shall meet the design criteria set forth in the most recent version of the South Dakota Department of Transportation’s Erosion and Sedimentation Control Best Management Practices (SD-DOT BMPs), and shall be adequate to prevent transportation of sediment from the site to the satisfaction of the city.
(B) Clearing and grading.
(1) Clearing and grading of natural resources, such as forests and wetlands, shall not be permitted, except when in compliance with all other chapters of this section.
(2) Clearing techniques that retain natural vegetation and retain natural drainage patterns, as described in the SD-DOT BMPs, shall be used to the satisfaction of the city.
(3) Phasing shall be required on all sites disturbing greater than ten acres, with the size of each phase to be established at plan review and as approved by the city.
(4) Clearing, except that necessary to establish sediment control devices, shall not begin until all sediment control devices have been installed and have been stabilized.
(5) Cut and fill slopes shall be no greater than 2:1, except as approved by the city to meet other community or environmental objectives.
(6) Landscaping provided for erosion and sediment control, property protection, final backfill grade or storm water detention areas shall be shown on the plan with projected completion dates indicated.
(C) Erosion control.
(1) Soil must be stabilized within seven days of clearing or inactivity in construction.
(2) If vegetative erosion control methods, such as seeding, have not become established within four weeks, the city may require that the site be reseeded, or that a non-vegetative option be employed.
(3) On steep slopes or in drainage ways, special techniques that meet the design criteria outlined in the SD-DOT BMPs shall be used to ensure stabilization.
(4) Soil stockpiles must be secured against erosion or silting at the end of each work day.
(5) At the close of the construction season, the entire site must be stabilized, using a heavy mulch layer, or another method that does not require germination to control erosion.
(6) Techniques shall be employed to prevent the blowing of dust or sediment from the site.
(7) Techniques that divert-upland runoff past disturbed slopes shall be employed.
(D) Sediment controls.
(1) Sediment controls shall be provided in the form of settling basins or sediment traps or tanks, and perimeter controls.
(2) Where possible, settling basins shall be designed in a manner that allows adaptation to provide long-term storm water management.
(3) Adjacent properties shall be protected by the use of a vegetated buffer strip, in combination with perimeter controls.
(E) Waterways and watercourses.
(1) When a wet watercourse must be crossed regularly during construction, a temporary stream crossing shall be provided and approval obtained from the appropriate agency(ies) having jurisdiction over such watercourse.
(2) When in-channel work is conducted, the channel shall be stabilized before, during and after work.
(3) All on-site storm water conveyance channels shall be designed according to the criteria outlined in the SD-DOT BMPs.
(4) Stabilization adequate to prevent erosion must be provided at the outlets of all pipes and paved channels.
(F) Construction site access.
(1) A temporary access road shall be provided at all sites.
(2) Other measures may be required at the discretion of the city in order to ensure that sediment is not tracked onto public streets by construction vehicles, or washed into storm drains.
(Prior Code, § 32-04) (Ord. 1088, passed 4-5-2010)