(a) The National Categorical Pretreatment Standards as promulgated by the USEPA pursuant to the Act which are hereby adopted and incorporated herein by reference shall be met by all users of the City’s Sewage Disposal System. (Copies of Standards shall be available at the office of the Director of Water/Sewer). The only exception to this requirement is when the City, upon application for removal credits, receives a modification to the Categorical Pretreatment Standards as provided for under the Act.
(b) State requirements and limitations on discharges to the Sewage Disposal System shall be met by all users which are subject to such standards in any instance in which they are more stringent than federal requirements and limitations or those in this or any other applicable ordinance.
(c) The City reserves the right to amend this chapter to provide for more stringent limitations or requirements on discharges to the Sewage Disposal System where deemed necessary to comply with the objectives set forth in Section 925.30.
(d) No user shall increase the use of potable or process water in any way, for the purpose of diluting a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the standards set forth in this chapter.
(e) No user shall discharge wastewater containing concentrations of the following enumerated materials, exceeding the following values:
Material | Concentration (mg/l) |
Arsenic | 0.259 |
Cadmium | 0.242 |
Chromium (Total) | 2.77 |
Chromium (Hexavalent) | 0.369 |
Copper | 3.2 |
Cyanide | 1.2, or BMP |
Lead | 0.7 |
Mercury | 0.0006, or BMP |
Molybdenum | 1.5 |
Nickel | 2.592 |
Selenium | 0.398 |
Silver | 0.43, or BMP |
Zinc | 2.61 |
(f) The City may impose mass limitations on users which are using dilution to meet the Pretreatment Standards or Requirements of this chapter, or in other cases where the imposition of mass limitations is deemed appropriate by the City.
(g) Discharges of petroleum oil, nonbiodegradable cutting oil or products of mineral oil are prohibited if discharged in amounts that can pass through or cause interference to the POTW.
(h) As used herein, the term “BMP” means Best Management Practices encompassing schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce pollution, and may include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. BMP may be substituted for the listed concentration in an industrial user permit upon an application submitted by such user and approval by the superintendent. (Ord. 2004-44. Passed 6-8-04.)