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 (PSES):
Subpart AL - Ferric Chloride
| Pollutant or pollutant property | PSES limitations | |
|---|---|---|
| Maximum for any 1 day | Average of daily values for 30 consecutive days | |
| Milligrams per liter (mg/l) | ||
| Total Chromium | 3.0 | 1.0 |
| Hexavalent Chromium | 0.25 | 0.09 |
| Copper (T) | 1.0 | 0.50 |
| Nickel (T) | 2.0 | 1.0 |
| Zinc (T) | 5.0 | 2.5 |