The city shall from time to time establish quantitative or other limitations where necessary to protect against pass- through and interference and to provide for protection of the POTW, worker safety, public health, or environment.
A. Substances And Quantities: In addition to national categorical pretreatment standards referenced in section 13.10.050 of this chapter, no user shall discharge wastewater containing concentrations (and/or mass limitations) of substances exceeding the following local limits:
Arsenic | 0.05 mg/kg |
Cadmium | 0.01 mg/kg |
Chromium (total) | 0.05 mg/kg |
Copper | 1.00 mg/kg |
Cyanide (total) | 0.20 mg/kg |
Fluoride | 1.40 mg/kg |
Lead | 0.05 mg/kg |
Mercury | 0.002 mg/kg |
Nickel | 0.02 mg/kg |
Silver | 0.05 mg/kg |
Zinc | 5.00 mg/kg |
Settleable solids | 10 mg/l |
Total chlorine residual | 1 mg/l |
pH | Not less than 6 nor more than 9 |
Total fats, grease and oils | 250 mg/l |
B. Industry Specific BMPs: Where possible and appropriate, the city may establish and implement industry specific BMPs (best management practices) in conjunction with or in lieu of numerical local limits. Such BMPs shall be considered pretreatment standards and are fully enforceable under this chapter.
C. Pollutant Specific BMPs: Based upon assessment of need and on a user specific basis, the city may incorporate pollutant specific BMPs or concentration or mass limits into indirect discharge permits. Wherever a user is subject to both a national categorical pretreatment standard and a local limit for a given pollutant, the more stringent limit or pretreatment standard shall apply.
The city reserves the right to enter into special agreements with users setting out special terms under which they may discharge to the POTW. In no case will a special agreement waive compliance with a categorical pretreatment standard or federal pretreatment requirement. However, the user may request a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15 page 14 of 33 supplement no. 56. They may also request a variance from the categorical pretreatment standard from the approval authority in accordance with 40 CFR 403.13.
D. Deadline For Compliance With Applicable Pretreatment Requirements: Compliance by existing users covered by categorical pretreatment standards shall be within one year of the date the standard is effective unless a shorter compliance time is specified in the appropriate standard. The city shall establish a final compliance deadline date for any existing user not covered by categorical pretreatment standards or for any categorical user when local limits for said user are more restrictive than EPA's categorical pretreatment standards.
New source dischargers are required to comply with applicable pretreatment standards within the shortest feasible time (not to exceed 90 days from the beginning of discharge). New sources shall install and have in operating condition, and shall start up all air pollution control equipment required to meet applicable pretreatment standards before beginning to discharge. Any indirect discharge permit issued to a categorical user shall not contain a compliance date beyond any deadline date established in EPA's categorical pretreatment standards. Any other existing user or a categorical user that must comply with a more stringent local limit, which is in noncompliance with any local limits, shall be provided with a compliance schedule placed in an indirect discharge permit to ensure compliance within the shortest time feasible. (Ord. 1397, 2015)