NR 463.04(3)(a)3.3. If a chemical fume suppressant containing a wetting agent is used, not allowing the surface tension of the electroplating or anodizing bath contained within the affected tank to exceed 45 dynes per centimeter (dynes/cm) (3.1 x 10-3 pound-force per foot (lbf /ft)) as measured by a stalagmometer or 35 dynes/cm (2.4 x 10-3 lbf /ft) as measured by a tensiometer at any time during tank operation.

NR 463.04(3)(b)(b) Enclosed tanks. During tank operation, each owner or operator of an existing, new or reconstructed affected source shall control chromium emissions discharged to the atmosphere from that affected source by doing any of the following:

NR 463.04(3)(b)1.1. Not allowing the concentration of total chromium in the exhaust gas stream discharged to the atmosphere to exceed 0.015 mg/dscm (6.6 x 10-6 gr/dscf) for all enclosed hard chromium electroplating tanks that are affected sources other than those that are existing affected sources at small, hard chromium electroplating facilities.

NR 463.04(3)(b)2.2. Not allowing the concentration of total chromium in the exhaust gas stream discharged to the atmosphere to exceed 0.03 mg/dscm (1.3 x 10-5 gr/dscf) if the enclosed hard chromium electroplating tank is an existing affected source and is located at a small, hard chromium electroplating facility.

NR 463.04(3)(b)3.3. If a chemical fume suppressant containing a wetting agent is used, not allowing the surface tension of the electroplating or anodizing bath contained within the affect tank to exceed 45 dynes/cm (3.1 x 10-3 lbf /ft) as measured by a stalagmometer or 35 dynes/cm (2.4 x 10-3 lbf /ft) as measured by a tensiometer at any time during tank operation.

NR 463.04(3)(b)4.4. Not allowing the mass rate of total chromium in the exhaust gas stream discharged to the atmosphere to exceed the maximum allowable mass emission rate determined by using the calculation procedure in s. NR 463.09 (6) (b) for all enclosed hard electroplating tanks that are affected sources other than those that are existing affected sources located at small, hard chromium electroplating facilities.

NR 463.04(3)(b)5.5. Not allowing the mass rate of total chromium in the exhaust gas stream discharged to the atmosphere to exceed the maximum allowable mass emission rate determined by using the calculation procedure in s. NR 463.09 (6) (d) if the enclosed hard chromium electroplating tank is an existing affected source and is located at a small, hard chromium electroplating facility.

NR 463.04(3)(c)(c) Facility size.

NR 463.04(3)(c)1.1. An owner or operator may demonstrate the size of a hard chromium electroplating facility by meeting the criteria of s. NR 463.02 (20) or (26). Alternatively, an owner or operator of a facility with a maximum cumulative potential rectifier capacity of 60 million A-hr/yr or more may be considered small if the actual cumulative rectifier capacity is less than 60 million A-hr/yr as demonstrated using one of the following procedures:

NR 463.04(3)(c)1.a.a. If records show that the facility’s previous annual actual rectifier capacity was less than 60 million A-hr/yr, by using nonresettable ampere-hour meters and keeping monthly records of actual ampere-hour usage for each 12-month rolling period following the compliance date in accordance with s. NR 463.103 (2) (L). The actual cumulative rectifier capacity for the previous 12-month rolling period shall be tabulated monthly by adding the capacity for the current month to the capacities for the previous 11 months.

NR 463.04(3)(c)1.b.b. By accepting a federally-enforceable limit on the maximum cumulative potential rectifier capacity of a hard chromium electroplating facility and by maintaining monthly records in accordance with s. NR 463.103 (2) (L) to demonstrate that the limit has not been exceeded. The actual cumulative rectifier capacity for the previous 12-month rolling period shall be tabulated monthly by adding the capacity for the current month to the capacities for the previous 11 months.

NR 463.04(3)(c)2.2. Once the monthly records required to be kept by s. NR 463.103 (2) (L) and by this paragraph show that the actual cumulative rectifier capacity over the previous 12-month rolling period corresponds to the large designation, the owner or operator is subject to the emission limitation identified in par. (a) 1. or 3. or (b) 1., 3. or 4., in accordance with the compliance schedule of s. NR 463.06 (1) (e).

NR 463.04(4)(4) Standards for decorative chromium electroplating tanks using a chromic acid bath and chromium anodizing tanks. During tank operation, each owner or operator of an existing, new or reconstructed decorative chromium electroplating tank using a chromic acid bath or chromium anodizing tank shall control chromium emissions discharged to the atmosphere from that affected source by one of the following:

NR 463.04(4)(a)(a) By not allowing the concentration of total chromium in the exhaust gas stream discharged to the atmosphere to exceed 0.01 mg/dscm (4.4×10-6 gr/dscf).

NR 463.04(4)(b)(b) If a chemical fume suppressant containing a wetting agent is used, by not allowing the surface tension of the electroplating or anodizing bath contained within the affected tank to exceed 45 dynes per centimeter (dynes/cm) (3.1 x 10-3 pound-force per foot (lbf /ft)) as measured by a stalagmometer or 35 dynes/cm (2.4 x 10-3 lbf /ft) as measured by a tensiometer at any time during operation of the tank.

NR 463.04(5)(a)(a) Each owner or operator of an existing, new or reconstructed decorative chromium electroplating tank that uses a trivalent chromium bath that incorporates a wetting agent as a bath ingredient is subject to the recordkeeping and reporting requirements of ss. NR 463.103 (2) (n) and 463.106 (9), but is not subject to the work practice requirements of s. NR 463.05, or the continuous compliance monitoring requirements in s. NR 463.07. The wetting agent shall be an ingredient in the trivalent chromium bath components purchased from vendors.

NR 463.04(5)(b)(b) Each owner or operator of an existing, new or reconstructed decorative chromium electroplating tank that uses a trivalent chromium bath that does not incorporate a wetting agent as a bath ingredient is subject to the standards of sub. (4).

NR 463.04(5)(c)(c) Each owner or operator of existing, new or reconstructed decorative chromium electroplating tank that had been using a trivalent chromium bath that incorporates a wetting agent and ceases using this type of bath shall fulfill the reporting requirements of s. NR 463.106 (9) (c) and comply with the applicable emission limitation within the timeframe specified in s. NR 463.06 (1) (f).

NR 463.04 HistoryHistory: Cr. Register, September, 1997, No. 501, eff. 10-1-97; CR 05-039: am. (3) (a), (4) (b), (5) (a) and (c), cr. (3) (a) 3. and (b), renum. (3) (b) to be (3) (c) and am. (3) (c) 1. a., b. and 2. Register February 2006 No. 602, eff. 3-1-06; CR 04-023: am. (1), (2) (a) and (b) 1. to 3. Register December 2008 No. 636, eff. 1-1-09.

NR 463.05(1)(1) Work practice standards. All owners or operators subject to the standards in s. NR 463.04 (3) and (4) are subject to the following work practice standards:

NR 463.05(1)(a)(a) At all times, including periods of startup, shutdown and malfunction, owners or operators shall operate and maintain any affected source, including associated air pollution control devices and monitoring equipment, in a manner consistent with good air pollution control practices, consistent with the operation and maintenance plan required by sub. (2).

NR 463.05(1)(b)(b) Malfunctions shall be corrected as soon as practicable after their occurrence in accordance with the operation and maintenance plan required by sub. (2).

NR 463.05(1)(c)(c) Determination of whether acceptable operation and maintenance procedures are being used will be based on information available to the department, which may include, but is not limited to, monitoring results; review of the operation and maintenance plan, procedures and records; and inspection of the source.

NR 463.05(1)(d)(d) Based on the results of a determination made under par. (c), the department may require that an owner or operator of an affected source make changes to the operation and maintenance plan required by sub. (2) for that source. Revisions may be required if the department finds that the plan does any of the following:

NR 463.05(1)(d)2.2. Fails to provide for the proper operation of the affected source, the air pollution control techniques, or the control system and process monitoring equipment during a malfunction in a manner consistent with good air pollution control practices.

NR 463.05(1)(d)3.3. Does not provide adequate procedures for correcting malfunctioning process equipment, air pollution control techniques or monitoring equipment as quickly as practicable.