A. All excavations, grading, or filling shall have a finished grade not to exceed a three to one (3:1) slope (33%). Steeper grades may be approved by the designated official if the excavation is through rock or the excavation or the fill is adequately protected (a designed head wall or toe wall may be required). Retaining walls that exceed a height of four feet (4') shall require the construction of safety guards as identified in the appropriate sections of the adopted BOCA codes and must be approved by the village building and zoning department. Permanent safety guards will be constructed in accordance with the appropriate section(s) of the adopted BOCA codes.
B. Sediment and erosion control plans for sites that exceed one acre of grading shall provide for sediment or debris basins, silt traps or filters, staked straw bales or other approved measures to remove sediment from runoff waters, the design to be approved by the designated official. Temporary siltation control measures (structural) shall be maintained until vegetative cover is established at a sufficient density to provide erosion control on the site. (Refer to section 12-2-10, appendix A of this chapter.)
C. All lots less than one acre that are currently being constructed upon as commercial or residential or having fill dirt added, removed, or relocated from any site in preparation for construction or grade changes to the lot may be required to take action to control silt runoff to public right of way or private adjacent property as determined by the appropriate official. Failure to install appropriate siltation barriers to prevent silt runoff may result in stop work orders until corrective action is taken. In addition, excessive siltation runoff from construction sites onto any adjacent property or right of way will be cleaned by those responsible. If not cleaned up at the end of the day, the responsible party will be billed for overtime pay and equipment cost. Where grade changes are made to existing vacant lots, no water runoff or silt runoff shall be directed to an adjacent property, and no natural water runoff shall be altered to block or increase natural drainage.
D. Where natural vegetation is removed during grading, vegetation shall be reestablished in such a density as to prevent erosion. Permanent type grasses shall be established as soon as possible or during the next seeding period after grading has been completed. (Refer to section 12-2-10, appendix A of this chapter.)
E. When grading operations are completed or suspended for more than thirty (30) days, permanent grass must be established at sufficient density to provide erosion control on the site. Between permanent grass seeding periods, temporary cover shall be provided according to the Illinois department of transportation "Standard Specifications For Road And Bridge Construction". (Refer to section 12-2-10, appendix A of this chapter.) All finished grades (areas not to be disturbed by future improvement) in excess of twenty percent (20%) slopes (5:1) shall be mulched and tacked at the rate of one hundred (100) pounds per one thousand (1,000) square feet when seeded.
F. Provisions shall be made to accommodate the increased runoff caused by changed soil and surface conditions during and after grading. Unvegetated open channels shall be designed so that gradients result in velocities of two (2) fps (feet per second) or less. Open channels with velocities more than two (2) fps and less than five (5) fps shall be established in permanent vegetation by use of commercial erosion control blankets or lined with rock, riprap or concrete or other suitable materials as approved by the designated official. Detention basins, diversions, or other appropriate structures shall be constructed to prevent velocities above five (5) fps. (Refer to section 12-2-10, appendix B of this chapter.)
G. The adjoining ground to development sites (lots) shall be provided with protection from accelerated and increased surface water, silt from erosion, and any other consequences of erosion, both during and following construction. Runoff water from developed areas (parking lots, paved sites and buildings) upstream of the area to be developed shall be directed to diversions, detention basins, concrete gutters and/or underground outlet systems. Sufficiently anchored straw bales may be temporarily substituted with the approval of the designated official. (Refer to section 12-2-10, appendix B of this chapter.)
H. Development along natural watercourses shall have residential, commercial or industrial improvements, parking areas or driveways set back a minimum of twenty five feet (25') from the top of the existing stream bank. The watercourse shall be maintained and made the responsibility of the property owners, subdivision trustees, in the case, by the subdivision or multiple property owners, common ground. Permanent vegetation should be left intact. Variances will include designed stream bank erosion control measures and shall be approved by the designated official. FEMA, IDNR/OWR and U.S. army corps of engineers' guidelines shall be followed where applicable regarding site development areas designated as floodplains and wetlands.
I. All lots shall be seeded and mulched at the rates defined in section 12-2-10, appendix A of this chapter or sodded before an occupancy permit shall be issued; except, that a temporary occupancy permit may be issued by the building and zoning department in cases of undue hardship because of unfavorable ground conditions.
J. Control nonstormwater discharges including concrete and wastewater from washout of concrete (unless managed by an appropriate control), drywall compound, wastewater from washout of 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. (Ord. 2015-19, 4-14-2015)