Effective stormwater pollution prevention on construction sites depends on a combination of preventing movement of soil from its original position (erosion control), intercepting displaced soil prior to entering a water body (sediment control), and proper on-site materials handling. The property owner must submit a SWPPP to the Town of Dyer. The following principles apply to all land-disturbing activities and should be considered in preparing a SWPPP with the Town of Dyer Stormwater Technical Standards Manual.
(a) Minimize the potential for soil erosion by designing a development to fit the topography and soils of the site. Deep cuts and fills in areas with steep slopes should be avoided wherever possible, and natural contours should be followed as closely as possible.
(b) Existing natural vegetation should be retained and protected wherever possible. Areas immediately adjacent, within twenty-five (25) feet of top of bank, to watercourses and lakes also should be left undisturbed wherever possible. Areas of bare soil, that are scheduled or likely to be left inactive for fourteen (14) days or more must be temporarily or permanently stabilized with measures appropriate for the season to reduce erosion potential. Alternative measures to site stabilization may be acceptable if the property owner or its representative can demonstrate that it has implemented and maintained erosion and sediment control measures adequate to prevent sediment discharge from the inactive area.
(c) All activities on a site should be conducted in a logical sequence so that the smallest practical area of land is exposed for the shortest practical period of time during development.
(d) The length and steepness of designed slopes should be minimized to reduce erosion potential drainage channels and swales must be designed and adequately protected so that their final gradients and resultant velocities will not cause erosion in the receiving channel or at the outlet. Methods for determining acceptable velocities are included in the Town of Dyer Stormwater Technical Standards Manual.
(e) Sediment-laden water which otherwise would flow from the project site must be treated by erosion and sediment control measures appropriate to minimize sedimentation. The property owner must provide stable and erosion-resistant construction site access point (i.e., crushed stone, slag, aggregate, etc.) at all points of construction traffic ingress and egress to the project site.
(f) The property owner must (1) implement appropriate measures to prevent wastes or unused building materials, including, garbage, debris, packaging material, fuels and petroleum products, hazardous materials or wastes, cleaning wastes, wastewater, concrete truck washout, and other substances from being carried from a project site by runoff or wind; (2) identify areas where concrete truck washout is permissible and clearly post such identification at appropriate areas of the site; (3) manage and dispose of wastes and unused building materials in accordance with all applicable State statutes and regulations; and (4) implement proper storage and handling of materials such as fuels or hazardous wastes, and spill prevention and cleanup measures to minimize the potential for pollutants to contaminate surface or ground water or degrade soil quality.
(g) The property owner must ensure that public or private roadways are kept clear of accumulated sediment that is a result of runoff or tracking. Bulk clearing of accumulated sediment may not include flushing the area with water. Cleared sediment must be redistributed or disposed of in a manner that is in accordance with all applicable statutes and regulations.
(h) Collected runoff leaving a project site must be either discharged directly into a well-defined, stable receiving channel, or diffused and released to adjacent property without causing an erosion or pollutant problem to the adjacent property owner. (Ord. No. 2021-32, §1, 11-10-21)