925.07 LIMITATIONS ON WASTEWATER STRENGTH.

   (a)   National categorical pretreatment standards as promulgated by the U.S. Environmental Protection Agency (EPA) pursuant to the Act shall be met by all users of the regulated industrial categories. 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's wastewater treatment system achieves consistent removal of the pollutants as defined by 40 CFR Section 403.7.

   (b)   State requirements and limitations on discharges to the POTW 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 an 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 POTW where deemed necessary to comply with the objectives set forth in Section 925.01.

   (d)   No 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.

(Ord. 2009-041. Passed 5-5-09.)

   (e)    No user shall discharge wastewater containing concentrations of the following enumerated materials, exceeding the following values:

Material	Concentration (mg/L)
Bis(2-ethylhexyl)phthalate	0.329
Cadmium	0.05
Total Chromium	0.90
Chromium (Hexavalent)	1.029
Copper	0.45
Cyanide	0.193
Lead	0.85
Mercury	Best Management Practices (BMPs)
Nickel	0.60
Phenols	0.40
Selenium	0.113
Silver	0.081
Zinc	1.10

(Ord. 2013-061. Passed 9-3-13.)

   (f)   The Superintendent may develop Best Management Practices (BMPs), by ordinance or in individual wastewater discharge permits, to implement Local Limits and the requirements of Section 925.06.
(Ord. 2009-041. Passed 5-5-09.)