The following pollutant limits are established to protect against pass-through and interference, protect air quality related to sludge incineration, provide for economical disposal of sludge ash and provide for safety of utility workers. No significant industrial user, nonsignificant industrial user, groundwater remediation or person shall discharge or cause to discharge any wastewater containing in excess of the following daily maximum allowable discharge limits. In addition the director may apply all or some of the limits set forth below as the director deems appropriate and designates in the user’s permit:

In addition to the above concentration limits and those contained in the categorical standards, the director may also impose mass limits if necessary for the protection of the POTW treatment plant facility and/or sludge disposal. Such poundage limits shall be derived using the following formula:

pounds/day = (conc. in mg/L) x (gal. discharge/day*) x 8.34

The above limits apply at the point where the wastewater is discharged to the POTW (end of the pipe). Categorical pretreatment standards apply at the end of the process. However, the director may elect to have local limits apply after pretreatment and/or prior to mixing with dilution flows.

All concentrations for metallic substances are for “total” metal unless indicated otherwise. The director may impose mass limitations in addition to (or in place of) the concentration based limitations above.

Where a user is subject to a categorical pretreatment standard and a local limit for a given pollutant, the more stringent limit or applicable pretreatment standard shall apply.

The city council authorizes the director to revise local limits. (Ord. 3220 § 2, 2016; Ord. 2742 § 2, 2008)