Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and meet the following pretreatment standards for existing sources (PSES):
Subpart G
[PSES Effluent Limitations]
| Pollutant or pollutant property | Maximum for any 1 day (mg/l) |
|---|---|
| Oil and grease | 100 |
| Copper | 5 |
| Chromium | 4 |
| Arsenic | 4 |
In cases where POTWs find it necessary to impose mass limitations, the following equivalent mass limitations are provided as guidance.
[Grams per cubic meter of production]
| Pollutant or pollutant property | Maximum for any 1 day |
|---|---|
| Oil and grease | 20.5 |
| Copper | .62 |
| Chromium | .41 |
| Arsenic | .41 |