13.16.020 Limitations on wastewater discharge characteristics.
A. Categorical Standards. All dischargers shall meet the supplementary limitations (subsection E of this section) and, where applicable, categorical standards.
B. State Requirements. State requirements and limitations on discharges into the sanitary sewer system apply in any case where they are more stringent than federal requirements and limitations or those in this code.
C. Right of Revision. The City reserves the right to amend this chapter to provide for more stringent limitations or requirements on discharges to the sanitary sewerage system if necessary to comply with the objectives of the federal general pretreatment regulations.
D. Dilution. No industrial user may increase the use of potable or process water in any way, for the purpose of diluting wastewater to achieve compliance with the standards set forth in this code.
E. Local Limitations. No industrial user may discharge wastewater containing concentrations of the following materials, exceeding the following:
|
Pollutant |
Maximum Daily Maximum Limit |
|---|---|
|
(Mg/L) |
|
|
Arsenic (As) |
.48 |
|
Cadmium (Cd) |
.50 |
|
Chromium (Cr) |
1.58 |
|
Copper (Cu) |
2.00 |
|
Cyanide (CN) |
1.00 |
|
Lead (Pb) |
1.00 |
|
Mercury (Hg) |
0.10 |
|
Molybdenum (M0) |
6.58 |
|
Oil and Grease |
100 |
|
Nickel (Ni) |
3.00 |
|
Selenium (Se) |
4.48 |
|
Silver (Ag) |
0.47 |
|
Zinc (Zn) |
4.00 |
1Limits established for total metals and total cyanide.
2Oil and grease limit is for total non-polar oils; petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin.
F. pH Effluent Limitations Under Continuous Monitoring.
1. Where an industrial user measures the pH of wastewater pursuant to a permit requirement, the permittee shall maintain the pH of such wastewater within the range set forth in the applicable effluent limitations guidelines, except excursions from the range are permitted subject to the following limitations:
a. The total time during which the pH values are outside the required range of pH values shall not exceed seven hours and twenty-six (26) minutes in any calendar month; and
b. No individual excursion from the range of pH values shall exceed sixty (60) minutes;
c. Discharge with pH < 5.0 is prohibited and not subject to excursion allowances;
d. Discharge with pH ≥ 12.5 is prohibited and not subject to excursion allowances.
2. For purposes of this section, an excursion is an unintentional and temporary incident in which the pH value of discharge wastewater exceeds the range set forth in the applicable effluent limitations guidelines.
G. Additional Limitations. The City Manager may apply best professional judgment (BPJ) and impose technical or performance-based pollutant concentrations and best management practices, in addition to limits specified in subsection E of this section, on local limitations. The City Manager may impose flow (gallons per day), mass (pounds per day), pH, and/or temperature limitations on industrial users. The City Manager may impose categorical equivalent mass or equivalent concentration limits pursuant to 40 CFR 403.6(c).
H. The prohibitions of WVMC 13.16.020 are incorporated into this chapter by this reference and may be enforced, pursuant to this chapter, against users subject to this chapter. (Ord. 2-2023 § 1 (Att. A), 2023; Ord. 3-2009, 2009; Ord. 2-2003, 2003.)