40 CFR 420.124: New source performance standards (NSPS).

The discharge of wastewater pollutants from any new source subject to this subpart shall not exceed the standards set forth below.

(a) Galvanizing, terne coating and other coatings—(1) Strip, sheet, and miscellaneous products.

Subpart L

Pollutant or pollutant property New source performance standards

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.0438 0.0188

O&G 0.0188 0.00626

Lead 0.000282 0.0000939

Zinc 0.000376 0.000125

Chromium (hexavalent) 1 0.0000376 0.0000125

pH (2) (2)

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

(2) [Reserved]

(b) Galvanizing and other coatings—(1) Wire products and fasteners.

Subpart L

Pollutant or pollutant property New source performance standards

Maximum for any 1 day Average of daily values for 30 consecutive days

Kg/kkg (pounds per 1,000 lb) of product

TSS 0.175 0.0751

O&G 0.0751 0.0250

Lead 0.00113 0.000376

Zinc 0.00150 0.000500

Chromium (hexavalent) 1 0.000150 0.0000501

pH (1) (1)

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

(2) [Reserved]

(c) Fume scrubbers.

Subpart L

New source performance standards Pollutant or pollutant property

Maximum for any 1 day Average of daily values for 30 consecutive days

kg/per day

TSS 5.72 2.45

O&G 2.45 0.819

Lead 0.0368 0.0123

Zinc 0.0491 0.0164

Chromium (hexavalent) 1 0.00490 0.00163

pH (2) (2)

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above.