Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection - Wisconsin Pollutant Discharge Elimination System › Chapter NR 290 - Steam Electric Power Generating › Subchapter I - - Direct Discharges › Section NR 290.12 - Discharge standards

Current through June 24, 2024
(1) BEST PRACTICABLE TECHNOLOGY. The
				  following effluent limitations and standards for all or specific wastewater
				  flows establish, except as provided in subch. IV of ch. NR 220, the quantity or
				  quality of pollutants or pollutant properties which may be discharged by a
				  facility subject to the provisions of this chapter after application of the
				  best practicable control technology currently available:
Note:
Despite this reference, federal
					 regulations in
					 40 CFR 125.30
					 and state regulations in s. NR 220.31(3) state that steam electric power
					 generators are ineligible to receive a fundamentally different factors variance
					 for BPT limitations.
(a) The pH of all
				  discharges, except once through cooling water, shall be within the range of 6.0
				  to 9.0. Dischargers which continuously monitor pH shall be subject to s.
				  NR
				  205.06.
(b) There may be no discharge of
				  polychlorinated biphenyl compounds such as those commonly used for transformer
				  fluid.
(c) The quantity of
				  pollutants in each of the wastewater sources identified in Table 1 may not
				  exceed the quantity determined by multiplying the flow by the concentration of
				  each pollutant listed in Table 1.
(d) Neither free available chlorine nor total
				  residual chlorine may be discharged from any unit for more than 2 hours in any
				  one day and not more than one unit in any plant may discharge free available or
				  total residual chlorine at any one time unless the utility can demonstrate to
				  the department that the units in a particular location cannot operate at or
				  below this level of chlorination.
(e) In the event that wastestreams from
				  various sources are combined for treatment or discharge, the quantity of each
				  pollutant or pollutant property limited in pars. (a) to (d) attributable to
				  each regulated stream except coal pile runoff may not exceed the specified
				  limitation for that waste source.
(f) Any untreated discharge from facilities
				  designed, constructed, and operated to treat the volume of coal pile runoff
				  which is associated with a 10 year, 24 hour rainfall event may not be subject
				  to the limitations of par. (c).
(g)
				  Where the department determines there is no need for a restriction on the mass
				  of pollutants discharged, the quantity of any pollutant allowed to be
				  discharged may be expressed as a concentration limitation instead of the mass
				  limitation required to be calculated by par. (c). Concentration limitations
				  shall be those concentrations specified in this subsection
Table 1
BPT Effluent Limitations in mg/
TSS
O&G
Iron (total)
Copper (total)
FAC
Wastewater
Avg.
Max.
Avg.
Max.
Avg.
Max.
Avg.
Max.
Avg.
Max.
Low volume waste
30
100
15
20
Fly ash transport water
30
100
15
20
Bottom ash transport water
30
100
15
20
Metal cleaning wastes
30
100
15
20
1.0
1.0
1.0
1.0
Once through cooling water
0.2
0.5
Cooling tower blowdown
0.2
0.5
Coal pile
								  runoff1
-
502