40 C.F.R. § 420.125
Except as provided in 40 CFR 403.7 and 403.13 , any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources.
Subpart L
| Pretreatment standards for existing sources | Pollutant or pollutant property | |
| Maximum for any 1 day | Average of daily values for 30 consecutive days | |
| Kg/kkg (pounds per 1,000 lb) of product | ||
| Lead | 0.00113 | 0.000376 |
| Zinc | 0.00150 | 0.000500 |
| Chromium (hexavalent)1 | 0.000150 | 0.0000501 |
1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.
Subpart L
| Pollutant or pollutant property | Pretreatment standards for existing sources | |
| Maximum for any 1 day | Average of daily values for 30 consecutive days | |
| kg/kkg (pounds per 1,000 lb) of product | ||
| Lead | 0.00451 | 0.00150 |
| Zinc | 0.00601 | 0.00200 |
| Chromium (hexavalent)1 | 0.000601 | 0.000200 |
1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.
Subpart L
| Pollutant or pollutant property | Pretreatment standards for existing sources | |
| Maximum for any 1 day | Average of daily values for 30 consecutive days | |
| Kg per day | ||
| Lead | 0.0368 | 0.0123 |
| Zinc | 0.0491 | 0.0164 |
| Chromium (hexavalent)1 | 0.00490 | 0.00163 |
1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.
The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above.
40 C.F.R. §420.125