The following pollutant limits are established to protect against pass through and interference.
(A) No person shall discharge wastewater containing in excess of the following:
Constituents | Concentration (mg/l) |
Constituents | Concentration (mg/l) |
Arsenic | 0.30 |
Beryllium | 0.50 |
Cadmium | 0.11 |
Chromium | 5.00 |
Copper | 0.45 |
Cyanide | 0.20 |
Hexavalent chromium | 0.50 |
Lead | 0.55 |
Mercury | 0.0003 |
Molybdenum | 0.05 |
Nickel | 1.50 |
Selenium | 0.60 |
Silver | 0.90 |
Total phenols | 2.00 |
Zinc | 5.00 |
(B) 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 city may impose mass limitations in addition to, or in place of, the concentration-based limitations above.
(C) If any waters or wastes are discharged, or are proposed to be discharged to the public sewers, which waters contain the substances or possess the characteristics enumerated in § 52.020, and which in the judgment of the Superintendent may have a deleterious effect upon the sewage works, processes, equipment or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the Authority may:
(1) Require new industries or industries with significant increase in discharges to submit information on wastewater characteristics and obtain prior approval for discharges;
(2) Reject the wastes in whole or in part for any reason deemed appropriate by the city;
(3) Require pretreatment of the wastes to within the limits of normal sewage, as defined in § 52.006;
(4) Require control or flow equalization of the wastes so as to avoid any slug loads or excessive loads that may be harmful to the treatment works; or
(5) Require payment of a surcharge on any excessive loadings discharged to the treatment works to cover the additional costs of having capacity for and treating the wastes. Each person or entity who discharges industrial wastes into the public waters shall be subject to a surcharge in addition to the regular sewage service charge based on both the BOD (COD where BOD cannot be determined) and Total Suspended Solids content of the wastes, if these wastes have a concentration greater than the following:
(a) A BOD of 240 mg/l, or a COD of 480 mg/l; and/or
(b) A TSS content of 200 mg/l.
(6) Surcharge rates will be assessed on a per pound basis in excess of the stated maximum using the formula:
(0.00624) × (billing sewage volume in 100 cubic feet) × (excess concentration)
example: (0.00624)(75)(400 - 300)=46.8 lb
(a) Excess BOD (COD) rate: $0.13/lb ($0.065/lb)
(b) Excess TSS rate: $0.16/lb.
(D) If the Authority permits the pretreatment or equalization of waste flows, the design and installation of the plant and equipment shall be subject to the review and approval of the Authority and subject to the requirements of all applicable codes, ordinances and laws.
(E) Where preliminary treatment or flow-equalizing facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at his or her expense.
(F) When required by the Authority, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable control manhole together with any necessary meters and
other appurtenances in the building sewer to facilitate observation, sampling and measurement of the wastes. The manhole, when required, shall be accessibly and safely located, and shall be constructed in accordance with plans approved by the city. The manhole shall be maintained by the owner at all times. Agents of the city, the State Department of Environmental Management, and the U.S. Environmental Protection Agency shall be permitted to enter all properties for the purpose of inspection, observation, measurement, sampling and testing.
(G) All measurements, tests and analyses of the characteristics of water and wastes to which reference is made in this chapter shall be determined according to the Code of Federal Regulations, specifically 40 CFR Part 136. All sampling shall be conducted at the control manhole. In the event that no special manhole has been required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer to the point at which the building sewer is connected.
(H) Sampling shall be carried out by customarily accepted methods to reflect the effect of constituents upon the sewage works and to determine the existence of hazards to life, limb and property. The sample type shall be linked to the duration of the pollutant limit being applied. Compliance with instantaneous limits shall be established using individual grab samples. Compliance with daily, weekly or monthly average limits shall be determined using composited sampling data except in the following cases:
(1) Sampling for parameters that may be altered in concentration by compositing or storage, like pH sensitive compounds, volatile organics and the like;
(2) Sampling for pollutants with short holding times such as hexavalent chromium and residual chlorine; and/or
(3) Sampling for pollutants which may adhere to the sample container or tubing such as fats, oils and grease.
(‘89 Code, § 105.09) (Am. Ord. passed 7-27-98) Penalty, see § 10.99