A. Pollutant Limits To Protect Against Pass-Through And Interference: The following pollutant limits are established to protect against pass-through and interference. No significant industrial user shall discharge wastewater containing pollutant levels in excess of the following daily maximum allowable discharge limits:
Pollutant | Daily Maximum
(mg/l)1 |
Pollutant | Daily Maximum
(mg/l)1 |
Arsenic | 0.05 |
Cadmium | 0.028 |
Chromium | 3.2 |
Copper | 0.515 |
Lead | 0.195 |
Mercury | 0.00067 |
Molybdenum | 0.12 |
Nickel | 0.42 |
Selenium | 0.107 |
Silver | 0.62 |
Zinc | 1.87 |
Oil and grease: | |
Animal and vegetable based | 350 |
Petroleum based | 100 |
pH minimum (S.U.) | 6.0 |
pH maximum (S.U.) | 10.0 |
Notes:
1. Pollutants are total and in mg/l unless otherwise specified.
B. Toxic Organic Management Plan (TOMP): Users with wastewater that may contain any of the toxic pollutants listed in 40 CFR 122, appendix D table II or pollutants that may be reasonably expected to be present shall, as part of the permit process, report the analyses for the toxic pollutants. If any of the toxic pollutants are found in the analyses, then the user may be required to continue to monitor for those toxic pollutants or the user may be allowed by the city to develop a TOMP in lieu of periodically monitoring for those toxic pollutants. The user must routinely submit a certification statement as part of its periodic self-monitoring report which asserts that there has been an increase in the discharge over previously reported amounts.
C. Applicability: The above limits apply at the point where the wastewater is discharged to the POTW (end of pipe). The superintendent 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 of applicable pretreatment standard shall apply.
D. Other Pollutant Limits: The following limits shall apply to wastewaters that are discharged from the groundwater cleanup of petroleum or gasoline underground storage tanks or other remediation wastewaters containing these pollutants or where these pollutants are appropriate surrogates. It shall be unlawful for any industrial user to discharge or cause to be discharged any waste or wastewater to the POTW that exceeds the following limits, as applicable:
Pollutant | Daily Maximum Limit (mg/l)1 |
Benzene | 0.050 |
BTEX2 | 0.750 |
Notes:
1. All pollutants shown in the table are total.
2. BTEX shall be measured as the sum of benzene, ethylbenzene, toluene and xylenes.
E. 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. 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 categorical pretreatment standard and a local limit for a given pollutant, the more stringent limit or pretreatment standards shall apply. (Ord. 3032, 2019: Ord. 2925, 2013)