A. Local Limits: 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 concentration limits, as determined from the analysis of any grab or composite sample collected:
Parameter | Local Limit (mg/l Unless Otherwise Noted) |
Parameter | Local Limit (mg/l Unless Otherwise Noted) |
Arsenic | 0.137 |
Boron | 1.095 |
Cadmium | 0.015 |
Chloride | 750 |
Chromium (total) | 0.369 |
Copper | 0.570 |
Electrical conductivity, (µmhos/cm) | 1,000 |
Lead | 0.465 |
Mercury | 0.018 |
Molybdenum | 4.736 |
Nickel | 0.521 |
pH (standard units) (allowable range) | 6.5 - 9.5 |
Selenium | 0.261 |
Silver | 0.403 |
Sodium | 205 |
Total oil and grease | 100 |
Zinc | 0.740 |
1. The above limits apply at the point where the wastewater is discharged to the POTW. The director of public works may impose more restrictive limitations, or mass limitations in addition to, or in place of, the concentration based limitations through any industrial user's discharge permit.
2. The above limits may be revised from time to time by the city as may be deemed necessary to protect the POTW from interference and pass-through, or as may be required by the applicable federal, state, or local pretreatment standards.
3. The director of public works may authorize discharges containing higher concentrations on a site specific basis, provided that the concentrations of such discharges shall not cause pass-through or interference. Upon approval by the director of public works, site specific limitations shall be established through the terms specified in the user's wastewater discharge permit. The director of public works may impose mass limitations in addition to, or in place of, concentration based limitations, due to reduced water usage by an industrial user.
B. Slugs And Equalized Discharges: No person shall cause the discharge of slugs of water or wastes. Each person producing a discharge of a slug into the public sewers shall construct and maintain, at his own expense, a suitable storage and flow control facility to ensure the equalization of the discharge over a twenty four (24) hour period. Such facility shall have a capacity of at least eighty percent (80%) of the total normal volume discharged during a twenty four (24) hour production period, unless a smaller size is approved by the director of public works, and the outlet to the sewer shall be equipped with a rate discharge controller or other device approved by the director of public works, the regulation of which shall be directed by the director of public works. (Ord. 2014-003, 7-22-2014)