Section 425.95 - Pretreatment standards for existing sources (PSES)(a) Except as provided in 40 CFR 403.7 and 403.13 , any existing source subject to this subpart that introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403, and must achieve the following pretreatment standards: | Pollutant or pollutant property | PSES |
| Maximum for any 1 day | Maximum for monthly average |
| Milligrams per liter (mg/l) |
| Total Chromium | 19 | 12 |
| pH | (1) | (1) |
1 Within the range 6.0 to 10.0.
(b) Any existing source subject to this subpart which processes less than 3,600 splits/day shall comply with § 425.95(a) , except that the total chromium limitations contained in § 425.95(a) do not apply.47 FR 52870, Nov. 23, 1982; 48 FR 30117, June 30, 1983, as amended at 53 FR 9183, Mar. 21, 1988