(a) National Categorical Pretreatment Standards. National categorical pretreatment standards as promulgated by the U.S. environmental Protection Agency (EPA) pursuant to the Act shall be met by all dischargers. An application for modification of the national categorical pretreatment standards may be considered for submittal to the Regional Administrator by the City, when the City of Mansfield's wastewater treatment system 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 dischargers which are subject to such standards in any instance in which they are more stringent than Federal requirements and limitations as those in this chapter or any other applicable ordinance.
(c) 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 of the City of Mansfield.
(d) Dilution. No discharger 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. This shall not prohibit the use of equalization tanks utilized to regulate flows.
(e) Supplementary Limitiations. No discharger shall discharge wastewater containing concentrations of the following enumerated materials, exceeding the following values:
Material Concentration (mg/1)
arsenic ---*
cadmium 0.5
copper 3.6
cyanide ---*
total cyanide 1.2
free cyanide ---*
lead 0.2
mercury 0.2
nickel 10.4
silver ---*
total chromium 11.8
hexavalent chromium ---*
zinc 4.0
*Values may be established at a future date.
(Ord. 84-6. Passed 2-2-84.)