NR 205.04(41) (41) “pH” means the logarithm of the reciprocal of the hydrogen ion concentration or the negative logarithm of the hydrogen ion concentration.

NR 205.04(42) (42) “PCB” means polychlorinated biphenyl.

NR 205.04(43) (43) “POTW” means publicity owned treatment work.

NR 205.04(43k) (43k) “PSES” means pretreatment standards for existing sources.

NR 205.04(43n) (43n) “PSNS” means pretreatment standards for new sources.

NR 205.04(44) (44) “sq ft” means square foot.

NR 205.04(45) (45) “sq m” means square meter.

NR 205.04(46) (46) “SS” or “TSS” means total suspended (nonfiltrable) solids.

NR 205.04(47) (47) “TDS” means total dissolved (filtrable) solids.

NR 205.04(48) (48) “TOC” means total organic carbon.

NR 205.04(49) (49) “TTO” means total toxic organics.

NR 205.04(50) (50) “tpd” means tons per day.

NR 205.04(51) (51) “ug” means micrograms.

NR 205.04(52) (52) “WPDES” means the Wisconsin pollutant discharge elimination system.

NR 205.04 History History: Cr. Register, September, 1984, No. 345, eff. 10-1-84; cr. (40m), (43k) and (43n), Register, April, 1990, No. 412, eff. 5-1-90; correction in (intro.) was made under s. 13.93 (2m) (b) 7., Stats., Register, May, 2001, No. 545.

NR 205.05 NR 205.05 Rainfall events. The design rainfall amount and probable intensity of 10-year and 25-year, 24-hour rainfall events for locations in Wisconsin shall be determined from the data in table 1, or for a particular location such determination may be made on the basis of more recent rainfall probability data verified by a government agency and approved by the department for this purpose.

- See PDF for table

NR 205.05 Note Note: The data of table 1 were obtained by extrapolation from maps published by the National Weather Service in Technical Paper No. 40, “Rainfall Frequency Atlas of the United States”.

NR 205.05 History History: Cr. Register, September, 1984, No. 345, eff. 10-1-84.

NR 205.06 NR 205.06 Effluent limitations applicable where pH is monitored continuously. When an industrial point source discharger continuously monitors the pH of wastewater in accordance with the requirements of a WPDES permit and the pH limits in the permit are established as part of the effluent limitations applicable to the category of dischargers to which the industrial point source belongs, the permittee shall maintain the pH of such wastewater within the range of the categorical limits, except pH excursions from the range are permitted subject to the following constraints:

NR 205.06(1) (1) The total time during which the pH values are outside the range of categorical pH limits may not exceed 7 hours and 26 minutes in any calendar month.

NR 205.06(2) (2) An individual excursion from the range of categorical pH limits may not exceed 60 minutes.

NR 205.06(3) (3) These provisions do not apply to pH limits required in a WPDES permit which are established under s. NR 102.05 (3) (h).

NR 205.06 History History: Cr. Register, September, 1984, No. 345, eff. 10-1-84; correction in (3) was made under s. 13.93 (2m) (b) 7., Stats., Register, May, 2001, No. 545.

NR 205.065 NR 205.065 Effluent Limitations.

NR 205.065(1) (1) Effluent limitations in permits. The department shall impose permit effluent limitations or effluent standards for discharges of pollutants on the discharge point of the permitted facility except as provided in sub. (2).

NR 205.065(2) (2) Internal waste streams. The department may impose permit effluent limitations or effluent standards for discharges of pollutants on an internal waste stream when all of the following are true:

NR 205.065(2)(a) (a) Imposing effluent limitations or standards at the point of discharge is impractical or infeasible.

NR 205.065(2)(b) (b) The internal waste stream has not mixed with other waste streams or cooling water streams.