The purpose of this chapter is to safeguard persons, protect property, prevent damage to the environment, and promote the public welfare by guiding, regulating and controlling the design, construction, use and maintenance of any development or other activity which disturbs or breaks the topsoil and other conditions allowing the movement of sedimentation with the city.
(A) The stormwater runoff from the disturbed areas of any subdivision or development shall not leave the development site without first passing through sediment control facilities. This requirement shall apply to all phases of construction and shall include an ongoing process of implementation of measures and maintenance of those measures during both the construction season and any construction shut down periods.
(B) Sediment and erosion control measures shall meet the requirements of Article 3 of the Will County Stormwater Management Ordinance, latest edition. Specifications for sediment and erosion control measures shall be in accordance with the latest edition of the Illinois Urban Manual. Sediment and erosion control measures planning and design shall be in accordance with Procedures and Standards for Urban Soil Erosion and Sedimentation Control in Illinois (the Green Book). Where the Illinois Urban Manual conflicts with the Green Book, the Illinois Urban Manual shall prevail.
(C) The objectives of sediment and erosion control requirements are to control soil erosion and sedimentation caused by any development activities, whether a site development permit is required or not, and to control erosion and sedimentation caused by runoff from vacant land. The following principles shall be incorporated into the design of any proposed development or into the maintenance plan for undeveloped property:
(1) A development shall be designed to take into account the topography and soils of the site, to create the least practicable potential for erosion. Areas of steep slopes with high cuts and fills should be avoided wherever possible. Natural contours should be followed as closely as possible.
(2) Natural vegetation shall be retained and protected wherever possible, especially in areas adjacent to a natural watercourse.
(3) The smallest practical area of land should be exposed for the shortest practical time during development. This may require project phasing.
(4) Areas which have been graded during development shall be protected with temporary vegetation, erosion blanket or mulch (when appropriate) as soon as practicable. Vegetation within public rights-of-way shall be kept eight inches tall or shorter by periodic mowing.
(5) Sediment basins shall be provided and shall be designed and sized in accordance with Article 300.5 of the Will County Stormwater Management Ordinance, latest edition.
(6) Provisions shall be made in the design to accommodate the increased runoff caused by changed soil and surface conditions during and after development.
(D) All subdivisions and developments that result in the disturbance of one or more acres total land area, or a disturbance less than one acre of total land that is part of a larger common plan that will ultimately disturb one or more acres total land area, shall meet the requirements of the Illinois Environmental Protection Agency's (IEPA) General NPDES Permit No. ILR10, Stormwater Discharges from Construction Site Activities. A Notice of Intent (NOI) and a Storm Water Pollution Prevention Plan (SWPPP) must be submitted to the IEPA at least 30 days prior to the start of construction. Weekly sedimentation and erosion control inspections are required for the duration of construction, until disturbed areas are stabilized with permanent vegetation. A copy of the NOI, SWPPP and weekly inspection reports shall be kept on site during construction, and an additional copy shall be provided to the Director of Public Works and Engineering or authorized designee.
(Ord. 18-008, passed 2-7-18; Am. Ord. 21-021, passed 8-18-21)