(a) National Categorical Pretreatment Standards. National Categorical Pretreatment Standards as promulgated by the U.S. EPA pursuant to the Act shall be met by all industrial users of the regulated industrial categories. A request for modification of the national categorical pretreatment standards may be considered for submittal to the Regional EPA administrator by the Superintendent, when the authority's POTW achieves consistent removal of the pollutants as defined by 40 CFR § 403.7.
(B) State requirements. State requirements and limitations on discharges to the POTW shall be met by all industrial 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 chapter or other applicable ordinances.
(D) Dilution. No industrial user 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.
(E) Specific limitations. No industrial user shall discharge wastewater to the POTW containing concentrations of the following materials, exceeding the following values:
Material | Symbol | Monthly Average Concentration | Daily Maximum Concentration |
Material | Symbol | Monthly Average Concentration | Daily Maximum Concentration |
Cadmium | Cd | 70 ug/L | 120 ug/L |
Hex chromium | Hex Cr | 810 ug/L | 1312 ug/L |
Total chromium | Cr,T | 2480 ug/L | 4340 ug/L |
Copper | Cu | * | * |
Cyanide | CN | 500 ug/L | 950 ug/L |
Lead | Pb | 60 ug/L | 90 ug/L |
Mercury | Hg | 5 ug/L | 5 ug/L |
Nickel | Ni | 1960 ug/L | 3097 ug/L |
Silver | Ag | 200 ug/L | 342 ug/L |
Zinc | Zn | 2250 ug/L | 3645 ug/L |
Phenols | 200 ug/L | 300 ug/L | |
Oil and grease | O & G | 50 mg/L | 100 mg/L |
Industrial users covered by Federal Categorical Pretreatment Standards shall meet those limitations specified under the effluent guidelines published under Section 304(b) and 307(b) of the Act or the above concentrations, whichever is more stringent.
* Cu: See Mass Proportion Table (Appendix II)
(Ord. 6-94, passed 4-27-94) Penalty, see § 52.999