(A) The following soil erosion and sediment control-related requirements shall be met for all regulated land disturbing activities as defined in § 170.04 of this chapter:
(1) All erosion control measures, construction and post construction storm water runoff shall meet the current minimum departmental and Illinois EPA standards and requirements at the time of installation.
(2) Construction site operators shall control or prohibit non-storm water discharges from any site. This includes concrete and wastewater from washout of concrete (unless managed by an appropriate control), drywall compound, wastewater from washout and cleanout of stucco, paint, form release oils, curing compounds and other construction materials, fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance, soaps, solvents, or detergents, toxic or hazardous substances from a spill or other release, or any other pollutant that could cause or tend to cause water pollution.
(3) Erosion control measures must be in place and approved prior to all land disturbances.
(4) Soil disturbance shall be conducted in such a manner as to minimize erosion. Areas of the development site that are not to be graded shall be protected from construction traffic or other disturbance until final seeding is performed. Soil stabilization measures shall consider the time of year, site conditions, and the use of temporary or permanent measures.
(5) Properties and channels adjoining development sites shall be protected from erosion and sedimentation. At points where concentrated flow leaves a development site, energy dissipation devices shall be placed at discharge locations and along the length of any outfall channel as necessary to provide a non-erosive velocity of flow from the structure to the watercourse so that the natural physical and biological characteristics and functions are maintained and protected.
(6) Soil erosion and sediment control features shall be constructed prior to the commencement of hydrologic disturbance of upland areas.
(7) Disturbed areas shall be stabilized with temporary or permanent measures within 14 calendar days following the end of active hydrologic disturbance, or redisturbance, consistent with the following criteria or using an appropriate measure as approved by the Administrator.
(a) Appropriate temporary or permanent stabilization measures shall include seeding, mulching, sodding, and/or non-vegetative measures.
(b) Areas of embankments having slopes greater than or equal to 3H:1V shall be stabilized with staked-in-place sod,,mat, or blanket in combination with seeding.
(c) Erosion control blankets shall be required on all interior detention basin side slopes between the normal water level and high water level.
(d) The 14-day stabilization requirement may be precluded by snow cover or where construction activity will resume within 21 days from when the active hydrologic disturbance ceased, then stabilization measures do not have to be initiated on that portion of the site by the fourteenth day after construction activity temporarily ceased, given that portion of the site has appropriate soil erosion and sediment controls.
(8) Land disturbance activities in streams shall be avoided, where possible. If disturbance activities are unavoidable, the following requirements shall be met:
(a) Where stream construction crossings are necessary, temporary crossings shall be constructed of non-erosive material.
(b) The time and area of disturbance of a stream shall be kept to a minimum. The stream, including bed and banks, shall be restabilized within 48 hours after channel disturbance is completed or interrupted.
(c) Any applicable federal and state permits that have been approved shall be provided to the Administrator.
(9) Soil erosion and sediment control measures shall be appropriate with regard to the amount of tributary drainage area as follows:
(a) Disturbed areas draining less than one acre shall, at a minimum, be protected by a filter barrier (including filter fences, which at a minimum, meet the applicable sections of the AASHTO Standard Specification 288-00, or equivalent control measures) to control all off-site runoff. Vegetated filter strips, with a minimum width of 25-feet, in the direction of flow, may be used as an alternative only where runoff in sheet flow is expected.
(b) Disturbed areas draining more than one but fewer than five acres shall, at a minimum, be protected by a sediment trap or equivalent control measure at a point downslope of the disturbed area.
(c) Disturbed areas draining five acres or more, shall, at a minimum, be protected by a sediment basin with a perforated filtered riser pipe or equivalent control measures at a point downslope of the disturbed area.
(d) Sediment basins shall have both a permanent pool (dead storage) and additional volume (live storage) with each volume equal to the runoff amount of a two-year, 24-hour event over the onsite hydrologically disturbed tributary drainage area to the sediment basin. The available sediment volume below normal water level, in addition to the dead storage volume shall be sized to store the estimated sediment load generated from the site over the duration of the construction period. For construction periods exceeding one year, the one-year sediment load and a sediment removal schedule may be submitted. If the detention basin for the proposed development condition of the site is used for the sediment basin, the above volume requirements will be explicitly met. Until the site is finally stabilized, the basin permanent pool of water shall meet the above volume requirements and have a filtered perforated riser protecting the outflow pipe.
(e) To calculate the sediment load, applicants can use FLOWSED as developed by the USEPA and other design guidelines by USEPA.
(10) All storm sewers that are or will be functioning during construction shall be protected by an appropriate sediment control measure and cleaned at any point during construction as needed and once the site has been stabilized.
(11) If dewatering services are used, adjoining properties and discharge locations shall be protected from erosion. Discharges shall be routed through an effective sediment control measure (e.g., sediment trap, sediment basin, or other appropriate measures).
(12) All temporary soil erosion and sediment control measures shall be removed within 30 days after final site stabilization is achieved or after the temporary measures are no longer needed. Trapped sediment and other disturbed soil areas, including areas disturbed while removing temporary measures, shall be permanently stabilized.
(13) A stabilized construction entrance, consisting of a stabilized mat of sufficiently sized aggregate underlain with filter cloth (or other appropriate measures) shall be located at any point where traffic will be entering or leaving a construction site of a major development to or from a public right-of-way, street, alley, or parking area. Any sediment or soil reaching an improved public right-of-way, street, alley, or parking area shall be removed by scraping or street cleaning. Sediment or soil shall at a minimum, be removed daily and more frequently as accumulations warrant. Removed sediment or soil shall be transported to a controlled sediment disposal area. The Administrator may require additional stabilized construction entrance methods.
(14) Earthen embankments shall be constructed with side slopes no steeper than 3H:1V. Steeper slopes may be constructed with appropriate stabilization as approved by the Administrator.
(15) Stormwater conveyance channels, including ditches, swales, and diversions, and the outlet of all channels and pipes shall be designed and constructed to withstand the expected flow velocity from the ten-year frequency storm without erosion. All constructed or modified channels shall be stabilized within 48 hours.
(16) Temporary diversions shall be constructed, as necessary, to direct all runoff from hydrologically disturbed areas to the appropriate sediment trap or basin.
(17) Soil stockpiles shall not be located in a flood-prone area or a designated buffer protecting Waters of the United States. Soil stockpiles are defined as having greater than 50 cubic yards of soil and will remain in place for more than seven days. Soil stockpile locations shall be shown on the soil erosion and sediment control plan and shall have the appropriate measures to prevent erosion of the stockpile.
(18) Handbooks: Standards and specifications contained in the Illinois Urban Manual, as amended, and the planning procedures sections of the Illinois Procedures and Standards for Urban Soil Erosion and Sedimentation Control, as amended, are referenced in this ordinance as guidance for presenting soil erosion and sediment control plan specifications and delineating procedures and methods of operation under site development for soil erosion and sediment control. In the event of conflict between provisions of said manuals and this chapter, this chapter shall govern.
(19) The applicant shall provide adequate receptacles for the deposition of all construction material debris generated during the development process. The applicant shall not cause or permit the dumping, depositing, dropping, throwing, discarding, or leaving of construction material debris upon or into any development site, channel, or Waters of the U.S. The applicant shall maintain the development site free of construction material debris.
(20) All regulated construction sites shall have a SWPPP that meets the requirements of Part IV of NPDES Permit No. ILR10.
(Ord. 9098, passed 5-16-17) Penalty, see § 170.99