(A) National categorical pretreatment standards. National categorical pretreatment standards as promulgated by the U.S. Environmental Protection Agency (U.S. EPA) pursuant to the Act shall be met by all dischargers of the regulated industrial categories. An application for modification of the national categorical pretreatment standards may be considered for submittal to the Approval Authority by the Director, when the city's wastewater treatment system achieves consistent removal of the pollutants as defined by 40 CFR 403.7
(B) Right of revision. The city reserves the right to amend this chapter to provide for more stringent limitations or requirements on discharges to the POTW where deemed necessary to comply with the objectives set forth in § 52.01 of this chapter.
(C) Dilution. No discharger shall increase the use of potable or process water in any way, nor mix separate waste streams 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. The Director may impose mass limitations on dischargers which are using dilution to meet applicable pretreatment standards or requirements, or in other cases where the imposition of mass limitations is appropriate.
(D) Supplementary limitations. No discharger shall discharge wastewater containing concentrations of the following enumerated materials exceeding the following values. Concentrations are in mg/l.
Material | Daily Mg/L
Limit | Monthly Mg/L Limit |
Arsenic | .126 | .126 |
Cadmium | 0.0823 | 0.0823 |
Chromium, Hexavalent | .430 | .430 |
Chromium, Total | 1.71 | 1.71 |
Copper | .730 | .730 |
Free Cyanide* | .050 | .050 |
Lead | .344 | .344 |
Mercury | .00133 | .00133 |
Molybdenum | .0911 | .0911 |
Nickel | 1.58 | 1.58 |
Selenium | .049 | .049 |
Silver | .0353 | .0353 |
Zinc | 1.33 | 1.33 |
* Cyanide will be discharged only by permit.
(E) The Director may develop Best Management Practices (BMP) by ordinance or in individual wastewater discharge permits (or general permits) to implement local limits and the requirements of § 52.11.
(1981 Code, § 52.11) (Ord. 6586-93, passed 1-10-1994; Am. Ord. 02-11-073, passed 12-23-2002; Am. Ord. 09-02-013, passed 2-9-2009) Penalty, see § 52.99