NR 102.05(2)(a)(a) The average minimum 7-day low streamflow which occurs once in 10 years (7-day Q10); or, NR 102.05(2)(b)(b) In the case of dissolved oxygen and wherever sufficient data on streamflow and temperature are available, by application of a 0.274% level of nonattainment. This is equivalent to an expected nonattainment of the dissolved oxygen criterion of one day per year. NR 102.05(3)(3) Mixing zones. Water quality standards shall be met at every point outside of a mixing zone. The size of the mixing zone shall be based on such factors as effluent quality and quantity, available dilution, temperature, current, type of outfall, channel configuration and restrictions to fish movement. For toxic and organoleptic substances with water quality criteria or secondary values specified in or developed pursuant to chs. NR 102 and 105, allowable dilution shall be determined as specified in ch. NR 106 in addition to the requirements specified in this subsection. As a guide to the delineation of a mixing zone, the following shall be taken into consideration: NR 102.05(3)(a)(a) Limiting mixing zones to as small an area as practicable, and conforming to the time exposure responses of aquatic life. NR 102.05(3)(b)(b) Providing passageways for fish and other mobile aquatic organisms. NR 102.05(3)(c)(c) Where possible, mixing zones being no larger than 25% of the cross–sectional area or volume of flow of a flowing water body and not extending more than 50% of the width. NR 102.05(3)(d)(d) Final acute criteria and secondary values specified in or developed pursuant to s. NR 105.05 for the fish and aquatic life subcategory for which the receiving water is classified not being exceeded at any point in the mixing zone. NR 102.05(3)(e)(e) Mixing zones not exceeding 10% of an inland lake’s total surface area. NR 102.05(3)(f)(f) Mixing zones not adversely impacting spawning or nursery areas, migratory routes, nor mouths of tributary streams. NR 102.05(3)(g)(g) Mixing zones not overlapping, but where they do, taking measures to prevent adverse synergistic effects. NR 102.05(3)(h)(h) Restricting the pH to values greater than 4.0 s.u. and to values less than 11.0 s.u. at any point in the mixing zone for the protection of indigenous fish and fish food organisms. NR 102.05(5)(5) Resource management exemptions. Application of chemicals for water resource management purposes in accordance with statutory provisions is not subject to the requirements of the standards except in case of water used for public water supply. NR 102.05(6)(a)(a) The criteria in the Radiation Protection Code, s. DHS 157.44, shall apply to the disposal and permissible concentrations of radioactive substances. NR 102.05(6)(b)(b) Methods used for analysis of samples shall be as set forth in ch. NR 219 unless alternative methods are specified by the department. NR 102.05 HistoryHistory: Cr. Register, September, 1973, No. 213, eff. 10-1-73; renum. (5) and (6) to be (6) and (7), cr. (5), Register, July, 1975, No. 235, eff. 8-1-75; r. and recr. (3), Register, August, 1981, No. 308, eff. 9-1-81; correction in (7) made under s. 13.93 (2m) (b) 7., Stats., cr. (4) (h), Register, September, 1984, No. 345, eff. 10-1-84; renum. from NR 102.03, r. (1), cr. (1) (b), renum. (2) to (7) to be (1) (a) to (6) and am. (2), (3) (intro.) and (d) and (6), Register, February, 1989, No. 398, eff. 3-1-89; am. (1) (b) 3., (3) (intro.) and (d), Register, August, 1997, No. 500, eff. 9-1-97; correction in (6) (a) made under s. 13.93 (2m) (b) 7., Stats. Register July 2006 No. 607, eff. 8-1-06; correction in (6) (a) made under s. 13.92 (4) (b) 7., Stats., Register July 2010 No. 655; CR 07-111: am. (3) (intro.), (b), (c), (e) and (f), r. (4) Register September 2010 No. 657, eff. 10-1-10. NR 102.06(1)(1) General. This section identifies the water quality criteria for total phosphorus that shall be met in surface waters. Assessment procedures for waterbodies are specified in ss. NR 102.07 and 102.60. NR 102.06(2)(2) Definitions. In this section, the following definitions apply: NR 102.06(2)(b)(b) “Ephemeral stream” means a channel or stream that only carries water for a few days during and after a rainfall or snowmelt event and does not exhibit a flow during other periods, and includes, but is not limited to, grassed waterways, grassed swales, and areas of channelized flow as defined in s. NR 243.03 (7). NR 102.06(2)(c)(c) “Mean water residence time” means the amount of time that a volume of water entering a waterbody will reside in that waterbody. NR 102.06(2)(d)(d) “Nearshore waters” means all waters of Lake Michigan or Lake Superior within the jurisdiction of the State of Wisconsin in the zone extending from the shore to a depth of 10 meters, based on the long-term mean elevation for Lake Superior of 183.4 meters (601.7 feet) and for Lake Michigan of 176.5 meters (579.0 feet). NR 102.06(2)(e)(e) “Open waters” mean all waters of Lake Michigan or Lake Superior within the jurisdiction of the State of Wisconsin with depths greater than nearshore waters. NR 102.06(3)(3) Rivers, streams, and impounded flowing waters. To protect the fish and aquatic life uses established in s. NR 102.04 (3) on rivers and streams that generally exhibit unidirectional flow, total phosphorus criteria are established as follows: NR 102.06(3)(a)(a) A total phosphorus criterion of 100 ug/L is established for the following rivers or other unidirectional flowing waters: NR 102.06(3)(a)1.1. Apple River from the outlet of the Apple River Flowage in Amery to the St. Croix River, excluding Black Brook Flowage. NR 102.06(3)(a)2.2. Bad River from confluence with the Marengo River within the Bad River Indian Reservation downstream to Lake Superior. NR 102.06(3)(a)3.3. Baraboo River from highway 58 in La Valle to the Wisconsin River. NR 102.06(3)(a)4.4. Bark River from confluence with Scuppernong River near Hebron to the Rock River.