Erosion control plan

Erosion control plan. (1) Responsibility. The department shall develop an erosion control plan for the project as part of the project design and contract documents. The department shall obtain DNR concurrence on the erosion control plan in accordance with interdepartmental liaison procedures. (2) General. (a) The department shall investigate the intended project site and design the erosion control plan to avoid or minimize adverse effects from erosion or a discharge to waters of the state. All of the following apply: 1. Temporary BMPs in the erosion control plan shall be based on at least a 2-year 24-hour design storm or a 2-year design storm with a duration equal to the time of concentration. 2. Permanent BMPs in the erosion control plan shall be based on at least a 10-year 24-hour design storm or a 10-year design storm with a duration equal to the time of concentration. (b) The erosion control plan shall identify the BMPs to be employed before, during, and after the completion of a project, including any post-construction SCPs that will be implemented with the project. The erosion control plan shall include BMPs, used alone or in combination as appropriate, from the standardized erosion control matrix published under s. Trans 401.05 . The department may allow the use of BMPs not specified in the matrix only if all of the following apply: 1. The department determines that such BMPs will control erosion as effectively as the BMPs specified in the matrix published under s. Trans 401.05 . 2. The department, with DNR concurrence, approves the use of the BMP. (c) The erosion control plan may be prepared in written and pictorial format, as necessary and appropriate to convey the design, intent, use, and placement of BMPs. (d) If the department or DNR identify areas or resources that require added protection, the erosion control plan shall include those areas or resources and additional BMPs as determined through interdepartmental liaison procedures. (e) The erosion control plan may be a separate project document or in segmented form throughout the contract documents. (f) For projects with one acre or more of land-disturbing construction activities, the project shall employ BMPs that, by design, limit the discharge of sediment load carried in runoff from initial grading through final stabilization to no more than 5 tons per acre per year, or to the maximum extent practicable, in accordance with interdepartmental liaison procedures. (3) Content. The erosion control plan for a project shall include, at a minimum, all of the following items: (a) The quarter, quarter-quarter, section, township, range, and the county in which the site is located. (b) A description of the project site and the nature of the land-disturbing construction activity and other pollutant-generating activities. (c) The total area of the site and the area of the site that will be disturbed by land-disturbing construction activities. (d) The available data describing the surface soil as well as subsoils. (e) Wherever permanent infiltration systems will be employed or have been evaluated, identify the depth to nearest seasonal high groundwater or top of bedrock. (f) The name of the immediate receiving waters, if any, from the United States Geological Survey 7.5-minute series topographic maps or other appropriate source. (g) Identify receiving waters and wetlands, including downstream waters within one-quarter mile of the site, and identify those designated as ERW, ORW, or impaired waters. (h) A site map that includes all of the following items: 1. The existing topography and drainage patterns, roads and surface waters, including drainage structures on and adjacent to the site. 2. The boundaries of the site. 3. The drainage patterns and approximate slopes anticipated after major land-disturbing construction activities. 4. The areas of land-disturbing construction activity. 5. The location of major structural and non–structural BMPs. 6. The location of areas where BMPs will be employed for stabilization. 7. The areas that will be vegetated following land-disturbing construction activities. 8. The area and location of wetlands on the site and locations where stormwater will discharge to a surface water or mapped wetland within one-quarter mile downstream of the site. 9. The location and type of permanent SCPs included with the project. 10. The areas used for infiltration of post-construction stormwater runoff. Use of an alignment with stationing and offsets satisfies this requirement. 11. An alphanumeric or equivalent grid overlying the entire site. (i) A description of appropriate BMPs that will be employed at the site. The description shall include, when appropriate, the following minimum requirements: 1. The preservation of existing vegetation where attainable and the stabilization of disturbed portions of the project site. 2. A description of structural practices to divert flow away from exposed soils, to store flows, or to otherwise limit runoff and discharge of pollutants from the project site. Structural practices shall be placed in upland soils, unless specifically approved in writing by the DNR. 3. The management of overland flow at the project site. 4. The trapping of sediment in channelized flow. 5. The protection of downslope drainage inlets. 6. The minimization of tracking at all vehicle and equipment exit locations from the project site. 7. The clean up of off-site sediment deposits. 8. The proper disposal of building and construction waste. 9. The stabilization of drainage ways. 10. The installation of permanent stabilization practices as soon as possible after completion of land-disturbing construction activity. 11. The minimization of dust to the maximum extent practicable.