(A) The Wastewater Superintendent is authorized to establish Local Limits pursuant to 40 CFR 403.5(c) and (d). The following pollutant limitations are established to protect against pass through interference and biosolids quality. No person shall discharge wastewater containing in excess of the following maximum concentrations based upon grab.
Maximum Concentration Limitations |
Maximum Concentration Limitations | |
2.6 mg/l | Arsenic (total) |
.62 mg/l | Cadmium (total) |
3.1 mg/l | Hex. Chromium |
1.3 mg/l | Total Chromium |
1.5 mg/l | Copper |
1.6 mg/l | Cyanide (total) |
5 mg/l | Lead (total) |
.34 mg/l | Mercury (total) |
1.0 mg/l | Molybdenum (total) |
9.1 mg/l | Nickel |
100 mg/l | Oil and grease [1] |
1.26 mg/l | Selenium |
1.2 mg/l | Silver |
17 mg/l | Zinc (total) |
(B) *40 CFR 433.17 - New Source Metal Finishing Categorical Pretreatment Standard limitations applied as it is identified as most stringent when compared to 2015 Local Limit calculations.
(C) Under the direction of the Wastewater Superintendent, BMPs may be developed and required. BMPs may include treatment requirements; operating procedures and practices to control site runoff, spillage or leaks, sludge or waste disposal; or drainage from raw materials storage. Per 40 CFR § 403.5(c)(4), BMPs shall be considered local limits and pretreatment standards for the purposes of this part and section 307(d) of the Act.
(D) The above limits apply at the point where the wastewater is discharged to the POTW. All concentrations for metallic substances are for "total" metal unless indicated otherwise. The Wastewater Superintendent may impose mass limitations in addition to, or in place of, the concentration-based limitations above.
(E) Upon the promulgation of the National Categorical Pretreatment Standard (NCPS) for a particular user, the said standard, if more stringent then the limitations imposed under this chapter for sources in that category, shall, when effective, immediately supersede the limitations and conditions imposed under this ordinance. The Wastewater Superintendent shall notify all known affected users of the applicable permitting and reporting requirements under 40 CFR 403.12.
(Ord. 2016-15, passed 8-10-2016)