§ 56.06 LOCAL LIMITS.

   (A)   It shall be unlawful to discharge into the POTW, any metals, chemicals or toxic substances in excess of the following concentration limits:

      (1)   The following heavy metals and toxic materials in the form of compounds or elements in solution or suspension in concentrations exceeding these limits:

Pollutant	Daily Maximum Local Limit (mg/L)
Arsenic (Total)	4.81
Cadmium (Total)	1.41
Chromium (Total)	8.70
Copper (Total)	9.74
Cyanide (Total)	1.12
Lead (Total)	3.35
Mercury (Total)	0.002
Nickel (Total)	13.39
Selenium (Total)	0.89
Silver (Total)	0.58
Zinc (Total)	4.14

 

      (2)   The city may set limits on a permit by permit basis for any other parameter that would pose a threat to water quality, health and safety, or the POTW or the discharge of which would otherwise result in violation of § 56.05 of this chapter, including but not limited to, priority pollutants found in the POTW influent at a concentration at or above 0.1 mg/L or numerical aquatic life criteria as defined by TCEQ.

      (3)   Any radioactive wastes or isotopes without prior written permission from the environmental officer.

   (B)   The above limits apply at the point where the wastewater is discharged to the POTW. The environmental officer may impose mass limitations in addition to, or in place of, the concentration-based limitations above.

   (C)   Dilution is prohibited as a substitute for treatment. Except where expressly authorized to do so by an applicable pretreatment standard or requirement, no industrial user shall ever increase the use of process water, or in any other way attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with a pretreatment standard or requirement. The environmental officer may impose mass limitations on industrial users which are using dilution to meet applicable pretreatment standards or requirements or in other cases where the imposition of mass limitations is appropriate.

(Ord. 160726-A, passed 7-26-2016)