NR 151.242(4)(4) Maximum extent practicable. If the design cannot meet a total suspended solids reduction performance standard of sub. (1), Table 1., the storm water management plan shall include a written, site-specific explanation of why the total suspended solids reduction performance standard cannot be met and why the total suspended solids load will be reduced only to the maximum extent practicable. The department may not require any person to exceed the applicable total suspended solids reduction performance standard to meet the requirements of maximum extent practicable. NR 151.242 NoteNote: Pollutant loading models such as DETPOND, 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 these models is available from the department’s storm water management program at dnr.wi.gov. Use the most recent version of the model and the rainfall files and other parameter files identified for Wisconsin users unless directed otherwise by the regulatory authority.
NR 151.242(5)(5) Off-site drainage. When designing BMPs, runoff draining to the BMP from off-site shall be taken into account in determining the treatment efficiency of the practice. Any impact on the efficiency shall be compensated for by increasing the size of the BMP accordingly. NR 151.242 HistoryHistory: CR 09-112: cr. Register December 2010 No. 660, eff. 1-1-11. NR 151.243NR 151.243 Peak discharge performance standard. NR 151.243(1)(1) Requirement. By design, BMPs shall be employed to maintain or reduce the 1-year, 24-hour and the 2-year, 24-hour post-construction peak runoff discharge rates to the 1-year, 24-hour and the 2-year, 24-hour pre-development peak runoff discharge rates respectively, or to the maximum extent practicable. The runoff curve numbers in Table 2. shall be used to represent the actual pre-development condition. NR 151.243 NoteNote: Where the pre-development condition is a combination of woodland, grassland, or cropland, the runoff curve number should be pro-rated by area.
NR 151.243(2)(2) Exemptions. This section does not apply to the following: NR 151.243(2)(a)(a) A transportation facility post-construction site where the discharge is directly into a lake over 5,000 acres or a stream or river segment draining more than 500 square miles. NR 151.243 NoteNote: The intent of s. NR 151.243 is to minimize streambank and shoreline erosion under bank-full conditions. NR 151.243 HistoryHistory: CR 09-112: cr. Register December 2010 No. 660, eff. 1-1-11. NR 151.244NR 151.244 Infiltration performance standard. NR 151.244(2)(2) Exemptions. Except as provided under s. NR 151.241 (4), transportation facility highway reconstruction and new highways are not required to meet the performance standards of this section. NR 151.244 HistoryHistory: CR 09-112: cr. Register December 2010 No. 660, eff. 1-1-11; renumbering of (1), (2) made under s. 13.92 (4) (b) 1., Stats., Register December 2010 No. 660. NR 151.245NR 151.245 Protective areas performance standard. NR 151.245(1)(1) Definition. In this section, “protective area” means an area of land that commences at the top of the channel of lakes, streams, and rivers, or at the delineated boundary of wetlands, and that is the greatest of the following widths, as measured horizontally from the top of the channel or delineated wetland boundary to the closest impervious surface. However, in this section, “protective area” does not include any area of land adjacent to any stream enclosed within a pipe or culvert, so that runoff cannot enter the enclosure at this location. NR 151.245(1)(a)(a) For outstanding resource waters and exceptional resource waters, 75 feet. NR 151.245(1)(b)(b) For perennial and intermittent streams identified on a U.S. geological survey 7.5-minute series topographic map, or a county soil survey map, whichever is more current, 50 feet. NR 151.245(1)(e)(e) For highly susceptible wetlands, 75 feet. Highly susceptible wetlands include the following types: calcareous fens, sedge meadows, open and coniferous bogs, low prairies, coniferous swamps, lowland hardwood swamps, and ephemeral ponds. NR 151.245 NoteNote: Information on wetland types, including ephemeral ponds, is available from the department at (608) 266-7012.
NR 151.245(1)(f)(f) For less susceptible wetlands, 10 percent of the average wetland width, but no less than 10 feet nor more than 30 feet. Less susceptible wetlands include: degraded wetlands dominated by invasive species such as reed canary grass; cultivated hydric soils; and any gravel pits, or dredged material or fill material disposal sites that take on the attributes of a wetland. NR 151.245(1)(g)(g) In pars. (d) to (f), determinations of the extent of the protective area adjacent to wetlands shall be made on the basis of the sensitivity and runoff susceptibility of the wetland in accordance with the standards and criteria in s. NR 103.03. NR 151.245(1)(h)(h) Wetland boundary delineation shall be made in accordance with s. NR 103.08 (1m). This paragraph does not apply to wetlands that have been completely filled in compliance with all applicable state and federal regulations. The protective area for wetlands that have been partially filled in compliance with all applicable state and federal regulations shall be measured from the wetland boundary delineation after fill has been placed. Where there is a legally authorized wetland fill, the protective area standard need not be met in that location. NR 151.245(1)(i)(i) For concentrated flow channels with drainage areas greater than 130 acres, 10 feet. NR 151.245(1)(j)(j) Notwithstanding pars. (a) to (i), the greatest protective area width shall apply where rivers, streams, lakes, and wetlands are contiguous. NR 151.245 NoteNote: A stream or lake is not eligible for a lower protective area width even if contiguous to a less susceptible wetland.
NR 151.245(2)(2) Applicability. This section applies to transportation facility post-construction sites located within a protective area, except those areas exempted pursuant to sub. (4). NR 151.245(3)(3) Requirements. The following requirements shall be met: NR 151.245(3)(a)(a) No impervious surface of a transportation facility may be constructed within a protective area, unless the transportation facility authority determines, in consultation with the department, that there is no practical alternative. If there is no practical alternative to locating a transportation facility within a protective area, the transportation facility may be constructed in the protective area only to the extent the transportation facility authority, in consultation with the department, determines is reasonably necessary. The transportation facility authority shall state in the design plan prepared pursuant to s. NR 151.241 (3), why it is necessary to construct the transportation facility within a protective area. NR 151.245(3)(b)(b) Where land disturbing construction activity occurs within a protective area, adequate sod or self-sustaining vegetative cover of 70 percent or greater shall be established and maintained where no impervious surface is present. The adequate sod or self-sustaining vegetative cover shall be sufficient to provide for bank stability, maintenance of fish habitat, and filtering of pollutants from upslope overland flow areas under sheet flow conditions. Non-vegetative materials, such as rock riprap, may be employed on the bank as necessary to prevent erosion such as on steep slopes or where high velocity flows occur. NR 151.245 NoteNote: It is recommended that seeding of non-invasive vegetative cover be used in the protective areas. Some invasive plants are listed in ch. NR 40. Vegetation that is flood and drought tolerant and can provide long-term bank stability because of an extensive root system is preferable. Vegetative cover may be measured using the line transect method described in the University of Wisconsin extension publication number A3533, titled “Estimating Residue Using the Line Transect Method”. NR 151.245(3)(c)(c) Best management practices such as filter strips, swales, or wet detention ponds, that are designed to control pollutants from non-point sources, may be located in the protective area. NR 151.245 NoteNote: Other laws, such as ch. 30, Stats., and chs. NR 103, 115, 116, and 117 and their associated review and approval processes may apply in the protective area. NR 151.245(4)(4) Exemptions. This section does not apply to any of the following: NR 151.245(4)(b)(b) Structures that cross or access surface waters such as boat landings, bridges, and culverts. NR 151.245(4)(d)(d) Transportation facilities from which the runoff does not enter the surface water, including wetlands, without first being treated by a BMP to meet the requirements of ss. NR 151.242 to 151.243, except to the extent that vegetative ground cover is necessary to maintain bank stability. NR 151.245 NoteNote: A vegetated protective area to filter runoff pollutants from transportation facilities described in par. (d) is not necessary since the runoff at that location is treated prior to entering the surface water. Other practices necessary to meet the requirements of this section, such as a swale or pond, will need to be designed and implemented to reduce runoff pollutants prior to runoff entering a surface water of the state. The requirements of ch. NR 103 still apply and should be considered before runoff is diverted to or from a wetland. NR 151.245 HistoryHistory: CR 09-112: cr. Register December 2010 No. 660, eff. 1-1-11. NR 151.246NR 151.246 Fueling and vehicle maintenance areas performance standard. Fueling and vehicle maintenance areas shall have BMPs designed, installed, and maintained to reduce petroleum within runoff, so that the runoff that enters waters of the state contains no visible petroleum sheen, or to the maximum extent practicable. NR 151.246 NoteNote: A combination of the following BMPs may be used: oil and grease separators, canopies, petroleum spill cleanup materials, or any other structural or non-structural method of preventing or treating petroleum in runoff.
NR 151.246 HistoryHistory: CR 09-112: cr. Register December 2010 No. 660, eff. 1-1-11. NR 151.247NR 151.247 Location. To comply with the standards required under ss. NR 151.242 to 151.244, BMPs may be located on-site or off-site as part of a regional storm water device, practice or system, but shall be installed in accordance with s. NR 151.003. NR 151.247 HistoryHistory: CR 09-112: cr. Register December 2010 No. 660, eff. 1-1-11. NR 151.248NR 151.248 Timing. The BMPs that are required under ss. NR 151.242 to 151.246 and 151.249 shall be installed before the construction site has undergone final stabilization. NR 151.248 NoteNote: In accordance with subch. V, the department has developed technical standards to help meet the post-construction performance standards. These technical standards are available from the department at dnr.wi.gov.
NR 151.248 HistoryHistory: CR 09-112: cr. Register December 2010 No. 660, eff. 1-1-11. NR 151.249NR 151.249 Swale treatment performance standard. NR 151.249(1)(1) Requirement. Except as provided in sub. (2), transportation facilities that use swales for runoff conveyance and pollutant removal are exempt from the requirements of ss. NR 151.242 to 151.244, if the swales are designed to do all of the following or to the maximum extent practicable: NR 151.249(1)(a)(a) Swales shall be vegetated. However, where appropriate, non-vegetative measures may be employed to prevent erosion or provide for runoff treatment, such as rock riprap stabilization or check dams. NR 151.249 NoteNote: It is preferred that tall and dense vegetation be maintained within the swale due to its greater effectiveness at enhancing runoff pollutant removal.
NR 151.249(1)(b)(b) Swales shall comply with the department technical standard 1005, “Vegetated Infiltration Swale”, dated May, 2007, except as otherwise authorized in writing by the department. NR 151.249 NoteNote: In accordance with subch. V, the Department of Natural Resources has updated technical standard 1005, “Vegetated Swale,” dated December 2017, which is the current authorized technical standard. The technical standard is available from the department at dnr.wi.gov.
NR 151.249(2)(a)(a) Notwithstanding sub. (1), the department may, consistent with water quality standards, require that other requirements, in addition to swale treatment, be met on a transportation facility with an average daily traffic rate greater than 2,500 and where the initial surface water of the state that the runoff directly enters is any of the following: NR 151.249(2)(a)3.3. Waters listed in section 303 (d) of the federal clean water act that are identified as impaired in whole or in part, due to nonpoint source impacts. NR 151.249(2)(b)(b) The transportation facility authority shall contact the department’s regional storm water staff or the department’s liaison to the department of transportation to determine if additional BMPs beyond a water quality swale are needed under this subsection. NR 151.249 HistoryHistory: CR 09-112: cr. Register December 2010 No. 660, eff. 1-1-11. NR 151.25NR 151.25 Developed urban area performance standard for transportation facilities. NR 151.25(1)(1) Applicability. This section applies to transportation facilities under the jurisdiction of the department of transportation for maintenance purposes that are located within a municipality regulated under subch. I of ch. NR 216. NR 151.25 NoteNote: Transportation facilities that are not under the jurisdiction of the department of transportation for maintenance purposes are subject to the performance standards in s. NR 151.13. NR 151.25(2)(a)(a) Except as provided in par. (c), the department of transportation shall develop and implement a storm water management plan in consultation with the department to control pollutants from transportation facilities described in sub. (1), for runoff from existing transportation facilities that enters waters of the state as compared to no storm water management controls. By design, the plan shall do the following: NR 151.25(2)(a)1.1. A 20 percent reduction in total suspended solids or to the maximum extent practicable, beginning not later than a date consistent with the municipality regulated under subch. I of ch. NR 216. NR 151.25(2)(a)4.4. Evidence of meeting the performance standard of this paragraph shall require the use of a model or an equivalent methodology approved by the department. Acceptable models and model versions include SLAMM version 9.2 and P8 version 3.4 or subsequent versions of those models. An earlier version of SLAMM is acceptable if no credit is being taken for street cleaning. NR 151.25 NoteNote: Information on how to access SLAMM and P8 and the relevant parameter files is available from the department’s storm water management program at dnr.wi.gov.
NR 151.25(2)(b)(b) The department of transportation shall inform and educate appropriate department of transportation staff and any transportation facility maintenance authority contracted by the department of transportation to maintain transportation facilities owned by the department of transportation regarding nutrient, pesticide, salt and other deicing material and vehicle maintenance management activities in order to prevent runoff pollution of waters of the state. NR 151.25(2)(d)(d) To comply with the standards required under this subsection, BMPs may be located on-site or off-site as part of a regional storm water device, practice or system, but shall be installed in accordance with s. NR 151.003. NR 151.26NR 151.26 Enforcement. This subchapter shall be enforced as follows: NR 151.26(1)(1) If a transportation facility that is exempt from prohibitions, permit or approval requirements by s. 30.2022 (1m), Stats., does not comply with the performance standards of this subchapter, the department shall initiate the conflict resolution process specified in the cooperative agreement between the department of transportation and the department established under the interdepartmental liaison procedures under s. 30.2022 (2), Stats. NR 151.26(2)(2) The department shall enforce this subchapter where applicable for transportation facilities not specified in sub. (1) under s. 281.98, Stats. NR 151.26 HistoryHistory: CR 00-027: cr. Register September 2002 No. 561, eff. 10-1-02; corrections in (1) made under s. 13.93 (2m) (b) 7., Stats., Register July 2004 No. 583; CR 09-112: am. (1) Register December 2010 No. 660, eff. 1-1-11; correction in (1) made under s. 13.92 (4) (b) 7., Stats., Register January 2017 No. 733. subch. V of ch. NR 151Subchapter V — Technical Standards Development Process for Non-Agricultural Performance Standards NR 151.30NR 151.30 Purpose. This subchapter specifies the process for developing and disseminating technical standards to implement the performance standards in subchs. III and IV, as authorized by s. 281.16 (2) (b), Stats., and establishes the procedures that the department shall use to determine if technical standards adequately and effectively implement, as appropriate, the performance standards in subchs. III and IV. This subchapter applies to technical standards developed or implemented by any agency of the state of Wisconsin. NR 151.30 HistoryHistory: CR 00-027: cr. Register September 2002 No. 561, eff. 10-1-02. NR 151.31NR 151.31 Technical standards development process. NR 151.31(1)(1) The department shall develop and revise technical standards to implement the performance standards in subchs. III and IV through a process outlined as follows: NR 151.31(1)(a)(a) The department may decide that a new or revised technical standard is necessary to implement a performance standard.
