(A) The Superintendent is authorized to establish local limits pursuant to 40 C.F.R. 403.5(c).
(B) (1) The following pollutant limits are established to protect against pass through, sludge contamination and interference. No person shall discharge wastewater containing in excess of the following daily maximum limit concentrations per day.
Ammonia nitrogen | 50.0 mg/l |
Antimony | 1.00 mg/l |
Arsenic | 0.46 mg/l |
Barium | 1.00 mg/l |
Beryllium | 0.50 mg/l |
Cadmium | 0.25 mg/l |
Chromium (Hexavalent) | 2.00 mg/l |
Chromium (Trivalent) | 3.50 mg/l |
Chromium Total | 3.50 mg/l |
Copper | 6.50 mg/l |
Cyanide (Total) | 0.50 mg/l |
Fluoride | 80.0 mg/l |
Iron | 10.0 mg/l |
Lead | 1.0 mg/l |
Manganese | 4.6 mg/l |
Mercury | 0.0005 mg/l |
Molybdenum | 0.50 mg/l |
Nickel | 0.50 mg/l |
Oil & Grease (FOG) | 100.0 mg/l |
pH - minimum standard units 5.5 *1 (daily discharge) | the same *1 |
pH - maximum standard units 9.5 *1 (daily discharge) | the same *1 |
Phenols | 7.50 mg/l |
Phosphorous | 10.0 mg/l |
Selenium | 0.40 mg/l |
Silver | 0.20 mg/l |
Sulfate | 500 mg/l |
Thallium | 0.50 mg/l |
Zinc | 1.27 mg/l |
Total identifiable chlorinated hydrocarbons | 1.0 mg/l |
*1 - pH standard shall be extended from 5.5 to 10.0 standard units if the manufacturing facility is engaged in the precipitation of metals in the pretreatment process. | |
(2) Discharge limits for BOD and TSS shall be established in individual wastewater discharge permits by the Industrial Pretreatment Coordinator. For existing users, BOD and TSS limits will be established based upon currently allowed discharge levels. For new users or existing users with new production capacity and discharging greater than 25,000 gpd, or where such user is deemed a “Significant Industrial User” by the Industrial Pretreatment Coordinator, concentration limits will be set at levels such that treatment efficiency and capacity at the POTW will not be diminished beyond the extent desired. Limits will be established that are economically achievable where possible.
(3) 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 Superintendent may impose mass limitations in addition to the concentration-based limitations above.
(C) The Superintendent may develop Best Management Practices (BMPs), by ordinance or in individual wastewater discharge permits, to implement local limits and the requirements of § 51.23.
(Ord. 2158, passed 1-26-2009)