Loading...
G-808 - 08/22/2006 - STORMWATER - OrdinancesORDINANCE 2006- SWM -RR -G -808 AN ORDINANCE AMENDING SECTIONS 9 -2 -2 ( "DEFINITIONS'), 9 -4 -2 (`DUTIES OF ADMINISTRATOR'), 9 -5 -1 ( "GENERAL INFORMATION'), 9 -5 -2 ( "GENERAL STORM WATER AND FLOODPLAIN REQUIREMENTS% 9 -5 -6 (`SEDIMENT AND EROSION CONTROL REQUIREMENTS "), 9 -6 -3 ('REQUIREMENTS FOR DEVELOPMENT WITHIN THE REGULATORY FLOODPLAIN "), 9 -7 -1 ( "GENERAL REQUIREMENTS "), AND 9 -7 -4 ( "STORM WATER SUBMITTAL') OF TITLE 9 ( "STORM WATER, FLOODPLAIN AND SEDIMENTATION AND EROSION CONTROL REGULATIONS") OF THE VILLAGE CODE OF THE VILLAGE OF OAK BROOK WHEREAS, the Village of Oak Brook is located almost entirely within DuPage County, which adopted a Countywide Stormwater and Flood Plain Ordinance, (the "County Ordinance ") on September 24, 1991, in accordance with Illinois Compiled Statutes, Chapter 34, paragraph 5 -1062, and WHEREAS, on February 11, 1992, the Village of Oak Brook passed and approved "An Ordinance Adopting Various Provisions of the DuPage County Countywide Stormwater and Flood Plain Ordinance" (Ordinance S -728), and WHEREAS, on March 24, 1992, the County designated the Village of Oak Brook as a complete waiver community for the enforcement of the County Ordinance, and WHEREAS, the Village of Oak Brook, as a complete waiver community, is required to adopt certain standards contained within the current County Ordinance as the minimum standards effective within its territorial jurisdiction although it may imposed higher standards, and WHEREAS, the Village has from time to time amended its storm water and flood plain regulations to conform with changes made by the County to the County Ordinance, and WHEREAS, on December 10, 2002, the Village of Oak Brook passed and approved a comprehensive amendment to its storm water and floodplain regulations entitled "An Ordinance Amending Title 9, Stormwater Management, of the Village Code of the Village of Oak Brook Relating to Stormwater, Flood Plain, Sedimentation and Erosion Control Regulations" (Ord G -709), and WHEREAS, the DuPage County Board has recently approved certain revisions to the DuPage County Countywide Stormwater Flood Plain Ordinance, and WHEREAS, it is in the best interests of the Village of Oak Brook that Title 9 be amended to incorporate the revisions to the DuPage County Countywide Stormwater Flood Plain Ordinance, stated below, by amending Sections 9 -2 -2, 9 -4 -2, 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1, and 9 -7 -4 of the Village Code as set forth below. NOW, THEREFORE, BE IT ORDAINED BY THE PRESIDENT AND BOARD OF TRUSTEES OF THE VILLAGE OF OAK BROOK, DU PAGE AND COOK COUNTIES, ILLINOIS, as follows Section 1 That the provisions of the preamble hereinabove set forth are hereby adopted as though fully set forth herein Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 2 of 13 Section 2 That Section 9 -2 -2 ( "Definitions ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by deleting the definitions of "Department ", "Development ", "Director ", "Firm ", "Floodway", and "Structure ", in their entirety, and replacing such definitions with the following DEPARTMENT The DuPage County Department of Engineering DEVELOPMENT. Any activity, excavation or fill, alteration, construction, subdivision, change in land use, or practice, undertaken by private or public entities that affects the discharge of storm water, or land modification, or any man -made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling, grading, paving, excavation or drilling operations or storage of equipment or materials in a Special Management Area The term "development" does not include maintenance of storm water facilities. DIRECTOR The DuPage County Director of Storm Water Management or his or her designee The Director of Storm Water Management shall be a professional engineer FIRM A flood insurance rate map A map issued by FEMA that is an official community map, on which map FEMA has delineated both the special hazard areas and the risk premium zones applicable to the community This map may or may not depict floodways The current effective FIRM for Oak Brook is dated effective December 16, 2004 FLOODWAY The channel and that portion of the floodplain adjacent to a stream or watercourse that is needed to convey the base flood without cumulatively increasing the water surface elevation by more the 0 1 feet. The maps that identify the current effective floodways for Oak Brook are dated effective December 16, 2004 STRUCTURE Anything that is erected or constructed The term "structure" includes, without limitation buildings, manufactured homes, tanks, dams, sewers, constructed channels, outfalls, parking lots, driveways, roads, sidewalks, and concrete patios Section 3 That Section 9 -2 -2 ( "Definitions ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by adding the following definitions in alphabetical order as they would appear therein FILTER BARRIER A temporary barrier installed below small disturbed areas to intercept and detain sediment FIS: A flood insurance study An examination, evaluation and determination of flood hazards and, if appropriate, corresponding water surface elevations The current effective FIS for Oak Brook is dated December 16, 2006 (DuPage County) LOWEST FLOOR The lowest floor of the lowest enclosed area (including basement) An unfinished or flood resistant enclosure, usable solely for parking of vehicles, building access or storage in an area other than a basement area is not considered a building's lowest floor, provided, that such Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 3 of 13 enclosure is not built so as to render the structure in violation of the applicable non - elevation design requirement of the Code of Federal Regulations 44, Part 60 3 NEW CONSTRUCTION For the purposes of determining insurance rates, structures for which the "start of construction" commenced on or after the effective date of an initial FIRM or after December 31, 1974, whichever is later, and included any subsequent improvements to such structures For flood plain management purposes, new construction means structures for which the start of construction commenced on or after the effective date of the flood plain management regulation adopted by Oak Brook and includes any subsequent improvements to such structures REGULATORY FLOOD MAP The flood plain map panels maintained and published by DuPage County which reflect the current effective flood zone boundaries as shown on the FIRM and all effective Letters of Map Change issued by FEMA SEDIMENT BASIN Settling ponds with pipe outlet, which have both a permanent pool (dead storage) and additional volume (live and sediment storage) components, to detain sediment -laden runoff from disturbed areas to allow sediment and debris to settle out. SEDIMENT TRAP A small, temporary ponding basin formed by the construction of an embankment or excavated basin to detain sediment -laden runoff from disturbed areas to allow sediment and debris to settle out SILT FENCE A temporary filter barrier of entrenched geotextile fabric (filter fabric) stretched across and attached to supporting posts START OF CONSTRUCTION The date the permit was issued provided the actual start of construction, repair, reconstruction, rehabilitation, addition or other improvement was within 180 days of the permit date The actual start date includes the first day of any land preparation, including clearing, grading, filling, or excavation For substantial improvements, the actual start of construction means the first alteration of any wall, ceiling, floor, or other structural part of a building whether or not that alteration affects the external dimensions of the building SUBSTANTIAL DAMAGE. Damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damaged condition would equal or exceed 50 percent of the market value of the structure before the damage occurred VIOLATION Failure of a structure or other development to be fully compliant with the regulations identified by Ordinance Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 4 of 13 Section 4 Section 9 -4 -2 ( "Duties of Administrator ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by deleting Subsection E in its entirety and replacing it with the following E Notifying the Director and all affected persons defined in subsection D of this section of any alteration or relocation of a watercourse including applications for CLOMR or LOMB, and Section 5* Section 9 -5 -1 ( "General Information ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by deleting Subsection E in its entirety and replacing it with the following E All development within special management areas shall also satisfy the requirements specified in chapter 6 of this title Section 6 Section 9 -5 -2 ( "General Storm Water and Floodplain Requirements ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by deleting Subsection E in its entirety and replacing it with the following E In areas outside the boundary of the regulatory floodplain, all usable space in new buildings, or added to existing buildings, shall either be elevated, floodproofed, or otherwise protected such that the lowest entry shall be at least two feet (2') above the adjacent base flood elevation to prevent the entry of surface storm water. Floodproofing devices shall be operational without human intervention If electricity is required for protection against flood damage, there shall be a backup power source that will activate without human intervention Floodproofing measures shall be certified by a professional engineer. Section 7 Section 9 -5 -6 ( "Sediment and Erosion Control Requirements ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by deleting such Section in its entirety and replacing it with the following 9 -5 -6 SEDIMENT AND EROSION CONTROL REQUIREMENTS: A The following principles shall apply to all development activities within the village and to the preparation of the submissions required under chapter 7 of this title 1 Development should be related to the topography and soils of the site to create the least potential for erosion Areas of steep slopes where high cuts and fills may be required should be avoided wherever possible, and natural contours should be followed as closely as possible, except as modified by an approved grading plan 2 Natural vegetation should be retained and protected wherever possible Areas immediately adjacent to natural watercourses should be left undisturbed wherever possible 3. The smallest practical area of land should be exposed for the shortest practical time during development 4 Sediment basins, debris basins, desilting basins, or silt traps or filters shall be installed and maintained to remove sediment from runoff waters from land undergoing development Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 5 of 13 5. Provisions shall be made to accommodate the increased runoff caused by changed soil and surface conditions during and after development Drainageways shall be designed so that their final gradients and the resultant velocities of discharges will not create additional erosion 6 Permanent vegetation and structures shall be installed as soon as practical during development B Erosion and sediment control features shall be considered as part of any development's initial site planning process The developer's engineer should consider the following factors in the overall site design 1 The susceptibility of the existing soils to erosion 2 The natural contours of the land 3 Existing native and mature vegetation 4 Existing natural or established drainageways 5 Emphasize erosion controls first then address sediment control C All developments, whether a permit is required or not, shall incorporate storm water management measures that control and manage runoff from such developments, as provided in this section Temporary erosion and sediment control measures shall be functional and consistent with the information and requirements of this entire section before land is otherwise disturbed on the site These measures shall be maintained during both the construction season and any construction shutdown periods until permanent erosion and sediment control measures are operational D Soil erosion and sediment control measures shall be appropriate with regard to the amount of tributary drainage area as follows. 1 Disturbed areas draining less than one (1) acre shall, at a minimum, be protected by a filter barrier or equivalent to control all runoff leaving the site The use of straw bales for this purpose is prohibited 2 Disturbed areas draining more than one (1) but fewer than five (5) acres shall, at a minimum, be protected by a sediment trap or equivalent control measure 3. Disturbed areas draining more than five (5) acres shall, at a minimum, be protected by a sediment basin or equivalent control measure E Pumping sediment -laden water into any storm water facility either directly or indirectly without filtration is prohibited Water removed from traps, basins and other water holding depressions or excavations must first pass through a sediment control and /or filtration device When dewatering devices are used, discharge locations shall be protected from erosion F All discharges to an undisturbed area, stabilized area or watercourse shall be designed at a nonerosive velocity corresponding to the soil and vegetative cover of the undisturbed area Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 6 of 13 G All temporary and permanent storm water conveyance channels, including ditches, swales, and diversions, and the outlets of all channels and pipes shall be designed and constructed to withstand the expected flow velocity from the 25 -year frequency storm without erosion assuming the worst soil cover conditions to prevail in the contributing drainage area over the life of the structure All materials specified shall be able to withstand these expected flow velocities without damage or soil erosion. Modifications to existing storm water facilities shall be stabilized within 48 hours. H All storm drain Inlets shall be protected by an appropriate sediment control measure when the area tributary to an inlet is disturbed Silt fences can be used to Intercept sheet flow only Unreinforced silt fences cannot be used as velocity checks In ditches or swales nor can they be used where they will Intercept concentrated flows Reinforced silt fences (normal silt fence reinforced with woven wire fencing) can be used to intercept sediment -laden water from disturbed areas less than one (1) acre Its purpose is to reduce the runoff velocity thereby allowing the deposition of transported sediment to occur K All Special Management Areas and waters of DuPage shall, at a minimum, have a dual silt fence barrier of protection Additional soil erosion and sediment control measures may be required to adequately protect these sites L All trenches, holes or other excavations required for utility Installation should be back - filled, and stabilized at the end of each working day No excavation should be opened more than what can be stabilized by the end of the same day If an excavation must be left unstabilized or opened overnight, soil erosion and safety protection measures shall be installed M The surface of stripped or disturbed areas shall be permanently or temporarily stabilized within 14 days after final grade Is reached or when left idle for more than 14 days Temporary erosion and sediment control measures shall be maintained continuously until permanent soil erosion control measures have been adequately established N Stockpiles of soil or any other building materials shall not be located In Special Management Areas O If a stockpile is to remain in place for more than three (3) days, then erosion and sediment control shall be provided for such stockpile P All waste generated as a result of site development (including discarded building materials, concrete truck washout, chemicals, litter, sanitary waste or any other waste) shall be properly disposed of and be prevented from being carried off the site by either wind or water Q. Graveled roads, access drives, parking areas of sufficient width and length, and vehicle wash down facilities if necessary, shall be provided to prevent soil from being tracked or deposited onto public or private roadways Any soil reaching a public or private roadway shall be removed immediately or as warranted and transported to a controlled sediment disposal area. Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 7 of 13 R. All temporary erosion and sediment control measures shall be removed within 30 days after final stabilization is achieved with permanent soil stabilization measures Trapped sediment and other disturbed soils resulting from temporary measures shall be properly disposed of and the area permanently stabilized S Design criteria, standards and specifications for erosion and sediment control shall be taken from one of the following sources 1 Technical Guidance for the DuPage Countywide Stormwater and Flood Plain Ordinance (Appendix E), as amended 2. IEPA/NRCS "Illinois Urban Manual ", as amended 3 Other design criteria, standards and specifications, provided prior written approval is received from the Director or Administrator 4 In the event of a conflict between the provisions of the above sources, this Ordinance and the Technical Guidance shall apply T Erosion and sediment control measures utilized in complying with the requirements of Section 9 -5 -6 of this Ordinance that have a design frequency assigned, such as in the references noted in Section 9 -5 -6S, shall have its design frequency increased to a design storm event equal to or greater than a 25 -year 24 -hour rainfall event U If at any stage of work under any storm water management permit the village determines that ,the nature of the site is such that further work authorized by an existing permit is likely to imperil any property, public way, watercourse or drainage structure, the village may require that reasonable special precautions be taken by the permittee as are considered advisable to avoid the likelihood of such peril "Special precautions" may include, but shall not be limited to, a more level exposed slope, construction of additional drainage facilities, berms, terracing, compaction, installation of plant materials for erosion control, and recommendations of a soil scientist which may be made requirements for further work V Where storm water damage may result because a land modification under a storm water management permit is not complete, the village may stop the work and the permittee may be required to install temporary structures or take such other measures as may be required to protect adjoining property or the public safety The village may require that the operations be conducted in specific stages so as to ensure prompt completion of protective measures. Section 8 Section 9 -6 -3 ( "Requirements for Development Within the Regulatory Floodplain ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by deleting such Section in its entirety and replacing it with the following 9 -6 -3 REQUIREMENTS FOR DEVELOPMENT WITHIN THE REGULATORY FLOODPLAIN: A. Development shall preserve effective floodway conveyance such that there will be no increases in flood elevations, flows, or floodway velocity, unless any such increases are contained in a public flood easement and a watershed benefit is provided B Structures that are floodproofed shall Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 8 of 13 1 Be anchored (including manufactured homes) to prevent flotation, collapse, or lateral movement of the structure. 2 Use flood resistant materials below the base flood elevation 3. Use construction methods and practices that do not increase the potential for increases in flood damage. 4 Locate electrical, heating, ventilation, plumbing, air conditioning equipment, and other service facilities at least one foot above the base flood elevation 5 Provide adequate drainage C. Temporary or permanent storage of the following are prohibited unless elevated or floodproofed to two feet (2') above the base flood elevation 1. Items susceptible to flood damage, or 2 Unsecured buoyant materials or materials that may cause off site damage including bulky materials, flammable liquids, chemicals, explosives, pollutants, or other hazardous materials, or 3 Landscape wastes D All usable space In new buildings in the floodplaln, added to existing buildings in the floodplaln, or in existing buildings In the floodplaln undergoing substantial improvement shall be elevated to at least two feet (2') above the base flood elevations E In areas outside the regulatory floodway but within the floodplaln, maximum flow depths on new parking lots shall not exceed one foot (1') during the base flood condition and shall be designed for protection against physical flood damages Flood hazard in parking areas below the base flood elevation shall be clearly posted F New structures other than buildings shall either be elevated to at least two feet (2') above the base flood elevation or designed for protection against physical flood damages Floodproofing devices shall be operational without human intervention If electricity is required for protection against flood damage, then there must be a backup power source that will activate without human intervention The floodproofing shall be certified by a professional engineer G Manufactured homes and construction trailers are prohibited in areas within the regulatory floodplaln H Parked recreational vehicles shall be required to meet the following elevation and anchoring requirements 1 All stands or pads shall be elevated to or above the base flood elevation, and 2 Adequate access and drainage shall be provided, and 3 If pilings are used for elevation, applicable design and construction standards for pilings shall be met, and Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9-4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 9 of 13 4 Anchoring shall be accomplished in accordance with the rules and regulations for the Illinois Mobile Home Tie -Down Act issued pursuant to 77 III Adm Code § 870 to resist flotation, collapse, and lateral movement unless 1 They are on site for fewer than 180 consecutive days, and, 2. They are fully licensed and ready for highway use A recreation vehicle is ready for highway use if it is on its wheels and /or hacking system, is attached to the site only by quick disconnect type utility and service devices, and has no permanently attached additions Existing structures shall not be enlarged, replaced, or structurally altered unless the changes meet the requirements for development If the changes constitute substantial improvement to a building in the floodplain, then the entire building shall meet the requirements for development Existing structures may be floodproofed Floodproofing shall meet the requirements listed in Section 9 -6 -313 for development in the floodplain and be operational without human intervention If electricity is required, then there must be a backup power source that will activate without human intervention. The floodproofing shall be certified by a professional engineer K Any placement of fill, structures, or other materials above grade in the floodplain shall require compensatory storage equal to at least 1 5 times the volume of floodplain storage displaced and shall be provided at the same incremental flood frequency elevation as the flood storage displaced Compensatory storage shall be operational prior to placement of fill, structures, or other materials in the regulatory floodplain Grading in special management areas shall be done in such a manner that the existing floodplain storage is maintained at all times Compensatory storage is not required for flood protection of existing buildings for floodplain volume displaced by the building and within the area of ten feet (10') adjacent to the building L A copy of an application for a CLOMR, CLOMA, LOMA, or LOMR including all the required information, calculations, and documents shall be submitted to the department concurrent with the application to FEMA or DW R or its designee M No filling, grading, dredging, or excavating which changes the base flood elevation, base flood flow rate or the floodway boundary shall take place until a CLOMR is issued by FEMA N If a LOMR is required by FEMA, no building construction shall take place until the LOMR is received O Any fill required to elevate a building must extend at least ten feet (10') beyond the foundation before the grade slopes below the base flood elevation P When a structure is elevated by some means other than filling in the regulatory floodplain 1 The usable space of any building, the bottom of the lowest structural member of the first finished floor (lowest habitable floor), and all electrical, heating, ventilating, plumbing, Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 10 of 13 and air conditioning equipment shall be located at least two feet (2') above the base flood elevation; and 2 Elevation can be accomplished using stilts, piles, walls, or other foundations Areas below the lowest floor that are subject to flooding shall be designed so that hydrostatic forces on exterior walls are automatically equalized by allowing for the entry and exit of floodwaters and shall be anchored and aligned in relation to flood flows and adjoining structures so as to minimize exposure to known hydrodynamic forces such as currents, waves, ice, and floating debris Designs for meeting this requirement shall be prepared, signed, and sealed by a structural engineer or architect and meet or exceed the following minimum criteria a A minimum of two (2) openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding, and b The bottom of all openings shall be no higher than one foot (1') above grade, and c Openings may be equipped with screens, louvers, valves, or other coverings or devices, provided that such coverings and devices do not impede the automatic entry and exit of floodwaters, and d The grade interior to the foundation of the structure shall not be more than 2 feet (2') below the lowest adjacent exterior grade, and e An adequate drainage system must be installed to remove floodwaters from the area interior to the structure foundation within a reasonable period of time after the floodwaters recede 3 All materials and structures less than two feet (2') above the base flood elevation shall be resistant to flood damage Q Existing flood storage that is lost due to channel modification shall require compensatory storage R Any removal, replacement, or modification of storm water facilities that has an existing hydraulic impact shall provide a watershed benefit and shall require compensatory storage to mitigate for any potential increases in flow or flood elevations All structures and their associated low entry elevations within the created backwater of the existing storm water facility shall be identified S The release rate from new or modified storm sewer outfalls shall meet the requirements of subsection 9 -5 -413 of this title or demonstrate compliance with section 9 -5 -2 of this title T On site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding U Sanitary sewer systems and water distribution systems shall be designed to minimize or eliminate infiltration or inflow of floodwaters and discharge of sewage V Hydrologic and hydraulic impacts of developments located in the regulatory floodway shall be evaluated using the applicable regulatory model and confirmed using watershed plan models, if available, or models meeting the plan standards for watershed planning The hydrologic and hydraulic impacts of development shall be evaluated using events Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 11 of 13 representing the frequency range from fifty percent (50 %) (2 -year) to one percent (1 %) (100 -year) probability of being equaled or exceeded in a given year. The results of any such evaluation shall be submitted to the department W Any proposed development in the regulatory floodway shall evaluate the hydrologic and hydraulic impacts for existing and any future planned watershed conditions X In the regulatory floodway portion of the regulatory floodplaln, all of the requirements of this section shall apply to any proposed development, and only the following appropriate uses shall be considered for permits- 1 Bridges, culverts, and associated roadways, sidewalks, railways, necessary for crossing over the floodway or for providing access to other appropriate uses In the floodway and any modification thereto, and 2 At or below grade trail systems; and 3 Regulatory floodway regrading, without fill, to create a positive slope toward a watercourse, and 4 Floodproofing activities to protect existing structures, and 5 Storm water facilities relating to the control of drainage or flooding, and 6 Above and below ground utilities and sanitary and storm sewer outfalls, and 7 The storage and conveyance of floodwaters, and 8 Erosion control structures and water quality and habitat structures, and 9 Recreational boating and commercial shipping facilities Y Transition sections within the regulatory floodway are required for the calculation of effective conveyance including the modification and the replacement of existing bridge and culvert structures, or to compensate for lost conveyance for other appropriate uses The following ratios shall be used to calculate transition sections I. Water will expand no faster than one foot (1') horizontal for every four feet (4') of flooded stream length 2 Water will contract no faster than one foot (1') horizontal for every one foot (1') of flooded stream length 3 Water will not expand or contract faster than one foot (1') vertical for every ten feet (10') of flooded stream length. Section 9 Section 9 -7 -1 ( "General Requirements ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by deleting Subsection H, paragraph 3 in its entirety and replacing it with the following 3 Analyses of alternative transition sections as required in subsection 9 -6 -3Y of this title, and Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 12 of 13 Section 10 Section 9 -7 -4 ( "Storm Water Submittal ") of Title 9 ( "Storm Water Floodplain, and Sedimentation and Erosion Control Regulations ") of the Village Code be amended by deleting Subsection F in its entirety and replacing it with the following F. The sediment and erosion control plan shall conform to the requirements of section 9 -5 -6 of this title. The sediment and erosion control plan shall include 1. A plan and schedule for construction, including site clearing and grading, construction waste disposal and stockpile locations, placement and maintenance of all soil stabilization controls, and sediment trapping facilities, and 2 A description of the development, including existing site land cover and hydrologic conditions, adjacent areas, soil types including a soils report and/or survey, permanent and temporary sediment and erosion control measures, and maintenance requirements, and 3 All data and calculations used to size, locate, design and maintain any soil erosion and sediment control measures, and 4 Plan view drawings of existing and proposed site conditions, at the same scale as the site storm water plan, including a Existing contours with drainage patterns and watershed boundaries, and b Soil types, vegetation, and land cover conditions, and c Limits of clearing and grading, and d Final contours with locations of drainageways and sediment and erosion control measures with the drainage area tributary to each sediment control measure delineated on the drawings, and e A sediment control quantity table including total project area, total disturbed area, total existing and proposed impervious area, and total number of units for each sediment control measure, and 5 Design details for proposed sediment and erosion control facilities, and 6 A copy of the written opinion, when applicable (the Village has opted -out of the district), of the soil and water conservation district required under 70 Illinois Compiled Statutes 405/22 02 (1992), and 7 Evidence that the sediment and erosion control installation and maintenance requirements, including both a list of maintenance tasks and a performance schedule, are identified and required in the plans and specifications Section 11 That this ordinance shall be in full force and effect from and after its passage, approval and publication in pamphlet form in the manner provided by law Section 12. That all ordinances or parts thereof in conflict with the provisions of this ordinance are hereby repealed to the extent of such conflict APPROVED THIS 22nd day of August, 2006 Kevin uinlan Villag President PASSED THIS 22nd day of August, 2006 Ayes, Trustees Aktipis, Craig, Kennedy, Manofsky, Sanford and Yusuf Nays None Absent None *�� CIO ATTEST r Ordinance 2006- SWM -RR -G- 808 Amending Sections 9 -2 -2, 9 -4 -2 9 -5 -1, 9 -5 -2, 9 -5 -6, 9 -6 -3, 9 -7 -1 and and 9 -7 -4 of the Village Code Page 13 of 13 W71A'0-4FA Linda K Gonnella, CM C�� ' Village Clerk /f