(A) Specific projects or activities may be exempt from all or part of the informational requirements listed below. Exemptions are detailed in the §§ 53.020, 53.035, 53.050, and 53.065. If a project or activity is exempt from any or all requirements of this chapter, an application should be filed listing the exemption criteria met, in lieu of the information requirements listed below. This level of detailed information is not required from individual lots, disturbing less than one acre of land, developed within a larger permitted project site. Review and acceptance of such lots is covered under § 53.083 of this subchapter.
(B) The different elements of a permit submittal include a draft notice of intent (NOI), proof of publication of a public notice, construction plans, a stormwater drainage technical report, a Stormwater Pollution Prevention Plan for active construction sites, a Post-Construction Stormwater Pollution Prevention Plan, and any other necessary supporting information. All plans, reports, calculations, and narratives shall be signed and sealed by a professional engineer or a licensed surveyor, registered in the State of Indiana.
(C) Draft notice of intent.
(1) The NOI is a standard form developed by the Indiana Department of Environmental Management which requires general project information. As part of the Boone County stormwater management permit application package, the NOI form should be completed in full based on data and information available at the time of application.
(2) An updated version of this form, accompanied by proof of publication in a newspaper of general circulation in the affected area that notified the public that a construction activity is to commence, will need to be resubmitted later after the stormwater management permit is granted and at least 48 hours prior to commencement of construction. The publication must include the following language:
"(Company name, address) is submitting an NOI letter to notify the Boone County Drainage Board and/or Boone County Surveyor and the Indiana Department of Environmental Management of our intent to comply with the requirements of the Boone County Stormwater Management Ordinance, as well as the requirements of 327 I.A.C. 15-5 and 327 I.A.C. 15-13, to discharge stormwater from construction activities for the following project: (name of the construction project, address of the location of the construction project, and Parcel Identification Number). Run-off from the project site will discharge to (stream(s) receiving the discharge(s))."
(D) Construction plans. Construction plan sheets (larger than 11 inches by 17 inches, but not to exceed 24 inches by 36 inches in size) and an accompanying narrative report shall describe and depict the existing and proposed conditions. Note that in order to gain an understanding of and to evaluate the relationship between the proposed improvements for a specific project section/phase and the proposed improvements for an overall multi-section (phased) project, the detailed information requested herein for the first section/phase being permitted must be accompanied by an overall project plan that includes the location, dimensions, and supporting analyses of all detention/retention facilities, primary conveyance facilities, and outlet conditions. Construction plans need to include the following detailed items:
(1) Project narrative and supporting documents, including the following information:
(a) An index indicating the location, in the construction plans, of all information required by this subsection.
(b) Description of the nature and purpose of the project.
(c) A copy of a legal boundary survey for the site, performed in accordance with Rule 12 of Title 865 of the Indiana Administrative Code or any applicable and subsequently adopted rule or regulation for the subdivision limits, including all drainage easements and wetlands.
(d) Soil properties, characteristics, limitations, and hazards associated with the project site and the measures that will be integrated into the project to overcome or minimize adverse soil conditions.
(e) General construction sequence of how the project site will be built, including phases of construction.
(f) Fourteen-digit watershed hydrologic unit code.
(g) A reduced plat or project site map showing the lot numbers, lot boundaries, easements, and road layout and names. The reduced map must be legible and submitted on a sheet or sheets no larger than 11 inches by 17 inches for all phases or sections of the project site.
(h) A topographic map of the land to be developed and such adjoining land whose topography may affect the layout or drainage of the development. The contour intervals shall be one foot when slopes are less than or equal to 2% and shall be two feet when slopes exceed 2%. All elevations shall be given in either National Geodetic Vertical Datum of 1929 (NGVD) or North American Vertical Datum of 1988 (NAVD). The horizontal datum of topographic map shall be based on Indiana State Plane Coordinates, NAD83. The map will contain a notation indicating these datum information. The names of adjoining property owners must be labeled on the map.
1. If the project site is less than or equal to two acres in total land area, the topographic map shall include all topography of land surrounding the site to a distance of at least 100 feet.
2. If the project site is greater than two acres in total land area, the topographic map shall include all topography of land surrounding the site to a distance of at least 200 feet.
(i) Identification of any other state or federal water quality permits that are required for construction activities associated with the owner's project site.
(j) Proof of errors and omissions insurance for the registered professional engineer or licensed surveyor showing a minimum amount of $1,000,000 in coverage.
(2) Vicinity map depicting the project site location in relationship to recognizable local landmarks, towns, and major roads, such as a USGS topographic quadrangle map, or county or municipal road map.
(3) An existing project site layout that must include the following information:
(a) Location, name, and normal water level of all wetlands, lakes, ponds, and water courses on, or adjacent to, the project site.
(b) Location of all existing structures on the project site.
(c) One hundred-year floodplains, floodway fringes, and floodways. Please note if none exists.
(d) Soil map of the predominant soil types, as determined by the United States Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS) Soil Survey, or as determined by a soil scientist. Hydrologic classification for soils should be shown when hydrologic methods requiring soils information are used. A soil legend must be included with the soil map.
(e) Identification and delineation of vegetative cover such as grass, weeds, brush, and trees on the project site.
(f) Location of storm, sanitary, combined sewer, and septic tank systems and outfalls.
(g) Land use of all adjacent properties.
(h) Identification and delineation of sensitive areas.
(i) Existing topography at a contour interval appropriate to indicate drainage patterns.
(j) The location of regulated drains, farm drains, inlets and outfalls, if any of record.
(k) Location of all existing cornerstones within the proposed development and a plan to protect and preserve them.
(4) Final project site layout, including the following information:
(a) All information from the existing site layout items listed above.
(b) Location of all proposed site improvements, including roads, utilities, lot delineation and identification, proposed structures, and common areas.
(c) One hundred-year floodplains, floodway fringes, and floodways. Please note if none exists.
(d) Proposed final topography, at a contour interval appropriate to indicate drainage patterns.
(5) A grading plan, including the following information:
(a) Delineation of all proposed land disturbing activities, including off-site activities that will provide services to the project site.
(b) Location of all soil stockpiles and borrow areas.
(c) Information regarding any off-site borrow, stockpile, or disposal areas that are associated with a project site, and under the control of the project site owner.
(d) Existing and proposed topographic information.
(6) A drainage plan, including the following information:
(a) An estimate of the peak discharge, based on the ten-year storm 24-hour event, of the project site for post-construction conditions.
(b) The proposed 100-year and ten-year release rates determined for the site, showing the methodology used to calculate them and detailing considerations given to downstream restrictions (if any) that may affect the calculated allowable release rates.
(c) Calculation showing peak runoff rate after development for the ten-year and 100-year return period 24-hour storms do not exceed the respective allowable release runoff rates.
(d) Location, size, and dimensions of all existing streams to be maintained, and new drainage systems such as culverts, bridges, storm sewers, conveyance channels, and 100-year overflow paths/ponding areas shown as hatched areas, along with all associated easements.
(e) Locations where stormwater may be directly discharged into groundwater, such as abandoned wells or sinkholes. Please note if none exists.
(f) Locations of specific points where stormwater discharge will leave the project site.
(g) Name of all receiving waters. If the discharge is to a separate municipal storm sewer, identify the name of the municipal operator and the ultimate receiving water.
(h) Location, size, and dimensions of features such as permanent retention or detention facilities, including natural or constructed wetlands, used for the purpose of stormwater management. Include existing retention or detention facilities that will be maintained, enlarged, or otherwise altered and new ponds or basins to be built and the basis of their design.
(i) Emergency flood routing path(s) and their invert elevations from detention facilities to the receiving system.
(j) The estimated depth and amount of storage required by design of the new ponds or basins.
(k) One or more typical cross sections of all existing and proposed channels or other open drainage facilities carried to a point above the 100-year high water and showing the elevation of the existing land and the proposed changes, together with the high water elevations expected from the 100-year storm under the controlled conditions called for by this chapter, and the relationship of structures, streets, and other facilities.
(l) A drainage summary, which summarizes the basic conditions of the drainage design, including site acreage, off-site/upstream acreage, allowable release rates, post-developed 10-year, and 100-year flows leaving the site, volume of detention required, volume of detention provided, and any release rate restrictions.
(m) Arrows designating the direction of stormwater runoff.
(n) Spot elevations appropriate to define elevations.
(7) Any other information required by Boone County Drainage Board and/or Boone County Surveyor in order to thoroughly evaluate the submitted material.
(E) Stormwater drainage technical report. A written stormwater drainage technical report must contain a discussion of the steps taken in the design of the stormwater drainage system. Note that in order to gain an understanding of and to evaluate the relationship between the proposed improvements for a specific project section/phase and the proposed improvements for an overall multi-section (phased) project, the detailed information requested herein for the first section/phase being permitted must be accompanied by an overall project plan that includes the location, dimensions, and supporting analyses of all detention/retention facilities, primary conveyance facilities, and outlet conditions. The technical report needs to include the following detailed items:
(1) A summary report, including the following information:
(a) The significant drainage problems associated with the project;
(b) The analysis procedure used to evaluate these problems and to propose solutions;
(c) Any assumptions or special conditions associated with the use of these procedures, especially the hydrologic or hydraulic methods;
(d) The proposed design of the drainage control system; and
(e) The results of the analysis of the proposed drainage control system showing that it does solve the project's drainage problems and that it meets the requirements of this chapter and these standards. This must include a table summarizing, for each eventual site outlet, the pre-developed acreage tributary to each eventual site outlet, the unit discharge allowable release rate used, the resulting allowable release rate in cfs for the post-developed ten-year and 100-year events, pre-developed two-year flow rates in cfs as well as pre- and post-developed flow rates for ten- and 100-year events. The worksheet provided in the Boone County Stormwater Technical Standards Manual as Table 6-1 should be filled and submitted as part of the report. Any hydrologic or hydraulic calculations or modeling results must be adequately cited and described in the summary description. If hydrologic or hydraulic models are used, the input and output files for all necessary runs must be included in the appendices. A map showing any drainage area subdivisions used in the analysis must accompany the report.
(f) A narrative and photographic record of the condition of the downstream receiving system.
(g) Identification of any other state or federal water quality permits that are required for construction activities associated with the owner's project site.
(2) A hydrologic/hydraulic analysis, consistent with the methodologies and calculation included in the Boone County Stormwater Technical Standards Manual, and including the following information:
(a) A hydraulic report detailing existing and proposed drainage patterns on the subject site. The report should include a description of present land use and proposed land use. Any off-site drainage entering the site should be addressed as well. This report should be comprehensive and detail all of the steps the engineer took during the design process.
(b) All hydrologic and hydraulic computations should be included in the submittal. These calculations should include, but are not limited to: runoff curve numbers and runoff coefficients, runoff calculations, stage-discharge relationships, times-of-concentration and storage volumes.
(c) Copies of all computer runs. These computer runs should include both the input and the outputs. Electronic copies of the computer runs with input files must also be included.
(d) A set of exhibits should be included showing the drainage sub-areas and a schematic detailing of how the computer models were set up.
(e) A conclusion which summarizes the hydraulic design and details how this design satisfies this chapter.
(F) Stormwater Pollution Prevention Plan for construction sites.
(1) For sites with total disturbance of one acre or more, a Stormwater Pollution Prevention Plan (SWPPP) associated with construction activities must be designed to, at least, meet the requirements of this chapter. For land disturbances totaling less than one acre but greater than 10,000 square feet, appropriate erosion and sediment control measures that are consistent with the Boone County Technical Standards must be designed and shown on the plans.
(2) The SWPPP must include the following:
(a) Location, dimensions, detailed specifications, and construction details of all temporary and permanent stormwater quality measures.
(b) Temporary stabilization plans and sequence of implementation.
(c) Permanent stabilization plans and sequence of implementation.
(d) Temporary and permanent stabilization plans shall include the following:
1. Specifications and application rates for soil amendments and seed mixtures.
2. The type and application rate for anchored mulch.
(e) Construction sequence describing the relationship between implementation of stormwater quality measures and stages of construction activities.
(f) A typical erosion and sediment control plan for individual lot development.
(g) Self-monitoring program including plan and procedures.
(h) A description of potential pollutant sources associated with the construction activities, which may reasonably be expected to add a significant amount of pollutants to stormwater discharges.
(i) Material handling and storage associated with construction activity shall meet the spill prevention and spill response requirements in 327 I.A.C. 2-6.1.
(j) Name, address, telephone number, and list of qualifications of the trained individual in charge of the mandatory stormwater pollution prevention self-monitoring program for the project site.
(G) Post-Construction Stormwater Pollution Prevention Plan. Sites with total disturbance of one acre or more, a Post-Construction Stormwater Pollution Prevention Plan must be designed to, at least, meet the requirements of this Ordinance and must include the information provided in the Boone County Technical Standards Manual. The Post-Construction Stormwater Pollution Prevention Plan must include the following information:
(1) A description of potential pollutant sources from the proposed land use, which may reasonably be expected to add a significant amount of pollutants to stormwater discharges.
(2) Location, dimensions, detailed specifications, and construction details of all post-construction stormwater quality measures.
(3) A description of measures that will be installed to control pollutants in stormwater discharges that will occur after construction activities have been completed. Such practices include infiltration of runoff, flow reduction by use of open, vegetated swales and natural depressions, buffer strip and riparian zone preservation, filter strip creation, minimization of land disturbance and surface imperviousness, maximization of open space, and stormwater retention and detention ponds.
(4) A sequence describing when each post-construction stormwater quality measure will be installed.
(5) Stormwater quality measures that will remove or minimize pollutants from stormwater runoff.
(6) Stormwater quality measures that will be implemented to prevent or minimize adverse impacts to stream and riparian habitat.
(7) A narrative description of the maintenance guidelines for all post-construction stormwater quality measures to facilitate their proper, long-term function. This narrative description shall be made available to future parties who will assume responsibility for the operation and maintenance of the post-construction stormwater quality measures.
(Ord. 2004-20, passed 12-13-2004)