(A) The following pollutant limits are established to protect against pass through and interference. No person shall discharge wastewater containing in excess of the following daily maximum concentrations based upon a 24-hour composite sample. Multiple industrial wastewater discharged from a permitted facility exclusive of domestic and cooling waters may be combined in a flow weighted manner to determine compliance with the following limitations for a daily maximum 24-hour composite sample:
(1) 0.10 mg/l arsenic (total);
(2) 0.016 mg/l mercury (total);
(3) 2.0 mg/l cadmium (total);
(4) 12.0 mg/l nickel;
(5) 0.90 mg/l hex. chromium;
(6) 1.0 mg/l selenium;
(7) 3.0 mg/l total chromium;
(8) 4.1 mg/l silver;
(9) 4.0 mg/l copper;
(10) 1.0 mg/l phenols;
(11) 0.02 mg/l cyanide (total);
(12) 10.0 mg/l zinc (total); and
(13) 0.02 mg/l lead (total).
(B) The above limits apply at the point where the wastewater is discharged to the POTW. All concentrations for metallic substances are for “total” metal unless indicated otherwise. The Wastewater Utility Superintendent may impose mass limitations in addition to, or in place of, the concentration-based limitations above.
(C) Upon the promulgation of the National Categorical Pretreatment Standard (NCPS) for a particular user, the standard, if more stringent than the limitations imposed under this chapter for sources in that category, shall, when effective, immediately supersede the limitations and conditions imposed under this chapter. The Wastewater Utility Superintendent shall notify all known affected users of the applicable permitting and reporting requirements under 40 CFR part 403.12.
(`93 Code, § 9-147) (Ord. 1994-601, passed 9-26-94)