NR 463.23 NR 463.23 Emissions limitations, work practice standards and operation and maintenance requirements.

NR 463.23(1) (1) What emission limits must I meet?

NR 463.23(1)(a) (a) You shall meet each of the following emission limits or standards that applies to you:

NR 463.23(1)(a)1. 1. For each electric arc metal melting furnace, electric induction metal melting furnace or scrap preheater at an existing iron and steel foundry, as described in s. NR 463.21 (3) (c), you may not discharge emissions through a conveyance to the atmosphere that exceed either the limit for particulate matter (PM) in subd. 1. a. or the limit for total metal HAP in subd. 1. b.:

NR 463.23(1)(a)1.a. a. 0.005 gr/dscf of PM.

NR 463.23(1)(a)1.b. b. 0.0004 gr/dscf of total metal HAP.

NR 463.23(1)(a)2. 2. For each cupola metal melting furnace at an existing iron and steel foundry, as described in s. NR 463.21 (3) (c), you may not discharge emissions through a conveyance to the atmosphere that exceed either the limit for PM in subd. 2. a. or the limit for total metal HAP in subd. 2. b.:

NR 463.23(1)(a)2.a. a. 0.006 gr/dscf of PM.

NR 463.23(1)(a)2.b. b. 0.0005 gr/dscf of total metal HAP.

NR 463.23(1)(a)3. 3. For each cupola metal melting furnace or electric arc metal melting furnace at a new iron and steel foundry, as described in s. NR 463.21 (3) (d), you may not discharge emissions through a conveyance to the atmosphere that exceed either the limit for PM in subd. 3. a. or, alternatively, the limit for total metal HAP in subd. 3. b.:

NR 463.23(1)(a)3.a. a. 0.002 gr/dscf of PM.

NR 463.23(1)(a)3.b. b. 0.0002 gr/dscf of total metal HAP.

NR 463.23(1)(a)4. 4. For each electric induction metal melting furnace or scrap preheater at a new iron and steel foundry, as described in s. NR 463.21 (3) (d), you may not discharge emissions through a conveyance to the atmosphere that exceed either the limit for PM in subd. 4. a. or, alternatively, the limit for total metal HAP in subd. 4. b.:

NR 463.23(1)(a)4.a. a. 0.001 gr/dscf of PM.

NR 463.23(1)(a)4.b. b. 0.00008 gr/dscf of total metal HAP.

NR 463.23(1)(a)5. 5. For each pouring station at an existing iron and steel foundry, as described in s. NR 463.21 (3) (c), you may not discharge emissions through a conveyance to the atmosphere that exceed either the limit for PM in subd. 5. a. or, alternatively, the limit for total metal HAP in subd. 5. b.:

NR 463.23(1)(a)5.a. a. 0.010 gr/dscf of PM.

NR 463.23(1)(a)5.b. b. 0.0008 gr/dscf of total metal HAP.

NR 463.23(1)(a)6. 6. For each pouring area or pouring station at a new iron and steel foundry, as described in s. NR 463.21 (3) (d), you may not discharge emissions through a conveyance to the atmosphere that exceed either the limit for PM in subd. 6. a. or, alternatively, the limit for total metal HAP in subd. 6. b.:

NR 463.23(1)(a)6.a. a. 0.002 gr/dscf of PM.

NR 463.23(1)(a)6.b. b. 0.0002 gr/dscf of total metal HAP.

NR 463.23(1)(a)7. 7. For each building or structure housing any emissions source at the iron and steel foundry, you may not discharge any fugitive emissions to the atmosphere that exhibit opacity greater than 20% averaged over 6 minutes except for one 6-minute average per hour that does not exceed 27% opacity.

NR 463.23(1)(a)8. 8. For each cupola metal melting furnace at a new or existing iron and steel foundry, you may not discharge emissions of volatile organic hazardous air pollutants (VOHAP) through a conveyance to the atmosphere that exceed 20 parts per million by volume (ppmv) corrected to 10% oxygen.

NR 463.23(1)(a)9. 9. As an alternative to the work practice standard in sub. (2) (e) for a scrap preheater at an existing iron and steel foundry or in sub. (2) (f) for a scrap preheater at a new iron and steel foundry, as described in s. NR 463.21 (3) (d), you may not discharge emissions of VOHAP through a conveyance to the atmosphere that exceed 20 ppmv.

NR 463.23(1)(a)10. 10. For one or more automated conveyor and pallet cooling lines that use a sand mold system, or one or more automated shakeout lines that use a sand mold system, at a new iron and steel foundry, as described in s. NR 463.21 (3) (d), you may not discharge emissions of VOHAP through a conveyance to the atmosphere that exceed a flow-weighted average of 20 ppmv.

NR 463.23(1)(a)11. 11. For each triethylamine (TEA) cold box mold or core making line at a new or existing iron and steel foundry, you shall meet either the emission limit in subd. 11. a. or the emission standard in subd. 11. b.:

NR 463.23(1)(a)11.a. a. You may not discharge emissions of TEA through a conveyance to the atmosphere that exceed 1 ppmv, as determined when scrubbing with fresh acid solution.

NR 463.23(1)(a)11.b. b. You shall reduce emissions of TEA from each TEA cold box mold or core making line by at least 99%, as determined when scrubbing with fresh acid solution.

NR 463.23(1)(b) (b) You shall meet each of the following operating limits that applies to you: