(50) “Separate storm sewer” means a conveyance or system of conveyances including roads with drainage systems, streets, catch basins, curbs, gutters, ditches, constructed channels, or storm drains that meets all of the following criteria:
(a) Is designed or used for collecting water or conveying runoff.
(b) Is not part of a combined sewer system.
(c) Is not part of a publicly owned wastewater treatment works that provides secondary or more stringent treatment.
(d) Discharges directly or indirectly to waters of the state.
(51) “Silviculture activity” means activities including tree nursery operations, tree harvesting operations, reforestation, tree thinning, prescribed burning, and pest and fire control. Clearing and grubbing of an area of a construction site is not a “silviculture activity.”
(52) “Site” means the entire area included in the legal description of the land on which the land disturbing construction activity occurred.
(53) “Stop work order” means an order issued by the [administering authority] that requires that all construction activity on the site be stopped.
(54) “Storm water management plan” means a comprehensive plan designed to reduce the discharge of pollutants from storm water, after the site has under gone final stabilization, following completion of the construction activity.
(55) “Storm water management system plan” means a comprehensive plan designed to reduce the discharge of runoff and pollutants from hydrologic units on a regional or municipal scale.
(56) “Technical standard” means a document that specifies design, predicted performance and operation and maintenance specifications for a material, device, or method.
(57) “Top of the channel” means an edge, or point on the landscape landward from the ordinary high-water mark of a surface water of the state, where the slope of the land begins to be less than 12 percent continually for at least 50 feet. If the slope of the land is 12 percent or less continually for the initial 50 feet landward from the ordinary high-water mark, the “top of the channel” is the ordinary high-water mark.
(58) “Total maximum daily load” or “TMDL” means the amount of pollutants specified as a function of one or more water quality parameters, that can be discharged per day into a water quality limited segment and still ensure attainment of the applicable water quality standard.
(59) “TP-40” means Technical Paper No. 40, Rainfall Frequency Atlas of the United States, published in 1961.
(60) “TR-55” means the United States Department of Agriculture, Natural Resources Conservation Service (previously soil conservation service), Urban Hydrology for Small Watersheds, Second Edition, Technical Release 55, June 1986, that is incorporated by reference for this chapter.
(61) “Transportation facility” means a highway, a railroad, a public mass transit facility, a public-use airport, a public trail, or any other public work for transportation purposes such as harbor improvements under s. 85.095 (1) (b), Wis. Stats. “Transportation facility” does not include building sites for the construction of public buildings and buildings that are places of employment that are regulated by the Wisconsin Department of Natural Resources pursuant to s. 281.33, Wis. Stats. (62) “TSS” means total suspended solids.
(63) “Type II distribution” means a rainfall type curve as established in the “United States Department of Agriculture, Soil Conservation Service, Technical Paper 149, published in 1973.”
(64) “Waters of the state” includes those portions of Lake Michigan and Lake Superior within the boundaries of this state, and all lakes, bays, rivers, streams, springs, ponds, wells, impounding reservoirs, marshes, watercourses, drainage systems, and other surface water or groundwater, natural or artificial, public or private, within this state or its jurisdiction.
(65) “Wis. Adm. Code” means the Wisconsin Administrative Code, published under s. 35.93, Wis. Stats. (66) “Wis. Stats.” means the Wisconsin Statutes published under s. 35.18 of the Wisconsin Statutes. S. 055 APPLICABILITY OF MAXIMUM EXTENT PRACTICABLE.
Maximum extent practicable applies when a person who is subject to a performance standard of this ordinance demonstrates to the [administering authority]’s satisfaction that a performance standard is not achievable and that a lower level of performance is appropriate. In making the assertion that a performance standard is not achievable and that a level of performance different from the performance standard is the maximum extent practicable, the responsible party shall take into account the best available technology, cost effectiveness, geographic features, and other competing interests such as protection of public safety and welfare, protection of endangered and threatened resources, and preservation of historic properties.
S. 06 TECHNICAL STANDARDS.
The following methods shall be used in designing the water quality, peak discharge, and infiltration components of storm water practices needed to meet the water quality standards of this ordinance:
(1) The use of the standards are consistent with the technical standards identified, developed, or disseminated by the Wisconsin Department of Natural Resources under subch. V of ch. NR 151, Wis. Adm. Code. (2) When technical standards have not been identified or developed by the Wisconsin Department of Natural Resources, other technical standards may be used provided that the methods have been approved by the [administering authority].
Note to Users: Pollutant loading models such as DETPOND, WinSLAMM, P8, or equivalent methodology may be used to evaluate the efficiency of the design in reducing total suspended solids. Use the most recent version of the model, rainfall files, and other parameter files identified for Wisconsin users unless directed otherwise by the regulatory authority.
S. 07 PERFORMANCE STANDARDS.