NR 151.23(6)(a)(a) Erosion and sediment control practices shall be constructed or installed before land disturbing construction activities begin and in accordance with the plan developed under sub. (3). NR 151.23(6)(b)(b) Erosion and sediment control practices shall be maintained until final stabilization. NR 151.23(6)(c)(c) Final stabilization activity shall commence when land disturbing activities cease and final grade has been reached on any portion of the site. NR 151.23(6)(d)(d) Temporary stabilization activity shall commence when land disturbing construction activities have temporarily ceased and will not resume for a period exceeding 14 calendar days. NR 151.23(6)(e)(e) BMPs that are no longer necessary for erosion and sediment control shall be removed by the responsible party. NR 151.23 HistoryHistory: CR 00-027: cr. Register September 2002 No. 561, eff. 10-1-02; CR 09-112: am. (title), (1), (3) (a), (4) (title), (5), cr. (2) (cm), (4m), (6) Register December 2010 No. 660, eff. 1-1-11. NR 151.24NR 151.24 Post–construction performance standard. NR 151.24(1)(1) Applicability. This section applies to a transportation facility that is or was subject to the construction performance standards of s. NR 151.23, except any of the following: NR 151.24(1)(a)(a) A transportation construction site where the department has received a notice of intent for the construction project in accordance with subch. III of ch. NR 216 within 2 years after October 1, 2002. NR 151.24(1)(b)(b) A transportation facility construction site that has undergone final stabilization within 2 years after October 1, 2002. NR 151.24(1)(bm)(bm) A transportation post-construction site for which the department received a notice of intent for the construction project in accordance with subch. III of ch. NR 216 on or after January 1, 2011. Transportation post-construction sites for which the department received a notice of intent for the construction project, in accordance with subch. III of ch. NR 216, on or after January 1, 2011, shall meet the performance standards of ss. NR 151.242 to 151.249. NR 151.24(1)(d)(d) Minor reconstruction of a highway. Notwithstanding the exemption under this paragraph, the protective areas requirements in sub. (6) apply to minor reconstruction of a highway. NR 151.24(1)(e)(e) A redevelopment transportation facility with no increase in exposed parking lots or roads. NR 151.24(1)(f)(f) A transportation facility with less than 10% connected imperviousness based on complete development of the transportation facility, provided the cumulative area of all parking lots and rooftops is less than one acre. NR 151.24 NoteNote: Projects that consist of only the construction of bicycle paths or pedestrian trails generally meet this exception as these facilities have minimal connected imperviousness.
NR 151.24(1)(h)(h) A transportation facility, the construction of which involves activity described in s. NR 151.23 (1) (a) 2. but that has less than one acre of land disturbing construction activity. NR 151.24(1)(i)(i) Transportation facility construction projects that are part of a larger common plan of development, such as a residential or industrial development, that are in compliance with the performance standards of subch. III. NR 151.24(1)(j)(j) Routine maintenance for transportation facilities if performed to maintain the original line and grade, hydraulic capacity or original purpose of the facility. NR 151.24(2)(2) Plan. A written plan shall be developed and implemented for each transportation facility and shall incorporate the requirements of subs. (3) to (10). NR 151.24(3)(3) Total suspended solids. Best management practices shall be designed, installed and maintained to control total suspended solids carried in runoff from the transportation facility as follows: NR 151.24(3)(a)(a) For new transportation facilities, by design, reduce to the maximum extent practicable, the suspended solids load by 80%, based on an average annual rainfall, as compared to no runoff management controls. No person shall be required to exceed an 80% total suspended solids reduction to meet the requirements of this paragraph. NR 151.24(3)(b)(b) For highway reconstruction and non-highway redevelopment, by design, reduce to the maximum extent practicable, the total suspended solids load by 40%, based on an average annual rainfall, as compared to no runoff management controls. No person shall be required to exceed a 40% total suspended solids reduction to meet the requirements of this paragraph. NR 151.24(3)(c)(c) Notwithstanding pars. (a) and (b), if the design cannot achieve the applicable total suspended solids reduction specified, the design plan shall include a written and site-specific explanation why that level of reduction is not attained and the total suspended solids load shall be reduced to the maximum extent practicable. NR 151.24 NoteNote: Pollutant loading models such as SLAMM, P8 or equivalent methodology may be used to evaluate the efficiency of the design in reducing total suspended solids. Information on how to access SLAMM and P8 is available from the storm water coordinator in the runoff management section of the bureau of watershed management at dnr.wi.gov.
NR 151.24(4)(a)(a) By design, BMPs shall be employed to maintain or reduce the peak runoff discharge rates, to the maximum extent practicable, as compared to pre-development site conditions for the 2-year, 24-hour design storm applicable to the transportation facility. Pre-development conditions shall assume “good hydrologic conditions” for appropriate land covers as identified in TR-55 or an equivalent methodology. The meaning of “hydrologic soil group” and “runoff curve number” are as determined in TR-55. However, when pre-development land cover is cropland, rather than using TR-55 values for cropland, the runoff curve numbers in Table 2 of subch. III shall be used. NR 151.24 NoteNote: The curve numbers in Table 2 represent mid-range values for soils under a good hydrologic condition where conservation practices are used and are selected to be protective of the resource waters.