The following are prohibited discharges:
(A) Any waste with a closed cup flash point of less than 140° F. or any liquids, solids, gases, vapors, or fumes, which by reason of their nature or quantity are, or may be, sufficient either alone or by interaction with other substances to cause fire or explosion or be injurious in any other way to the POTW, the operation of the POTW, or the employees of the POTW. Prohibited materials include but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides, and sulfides.
(B) Any waters or wastes having a pH lower than 6.0 or higher than 9.0 or having any other corrosive properties capable of causing damage or hazard to structures, equipment and personnel of the wastewater system.
(C) Any ashes, cinders, sand, mud, straw, metal shavings, glass, rags, feathers, tar, plastics, woods, paunch manure or any other solid or viscous substance capable of causing obstruction to flow in sewers or other interference with the proper operation of the sewage works.
(D) Any water or waste which may contain more than 100 milligrams per liter, by weight, of fat, oil or grease.
(E) Any garbage with particle size of one-half-inch in any dimension.
(F) The minimum temperature of the waste shall not be less than 32° F. at the point of discharge. The maximum temperature of the waste shall not be greater than 150° F. at the point of discharge and shall not cause a wastewater temperature in excess of 104° F. at the entrance to the treatment facility, whichever is more restrictive, unless written authorization is received from the city.
(G) Any noxious or malodorous liquids, gases, or solids which either singly or by interaction with other wastes are sufficient to create a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for maintenance and repair.
(H) Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
(I) Radioactive wastes or isotopes of such half-life or concentration which may exceed limits established by applicable state and federal regulations shall not be allowed.
(J) Any waste that is considered hazardous under RCRA regulations unless specifically exempted through a user contribution permit.
(K) Any trucked or hauled waste except at specific locations that have been approved by the superintendent of the POTW.
(L) Any trucked or hauled waste that would be considered a prohibited discharge under divisions (A) through (N) of this section.
(M) Any trucked or hauled waste that has not been approved by the Superintendent of the POTW.
(N) Any wastewater which causes a hazard to human life or creates a public nuisance.
(O) Any pollutants, including oxygen demanding pollutants (B.O.D., and the like) released at a flow rate and/or pollutant concentration which a user knows or has reason to know will cause interference to the POTW. In no case shall a slug load have a flow rate or contain quantities of pollutants that exceed for any period of time longer than 15 minutes, more than five times the average 24-hour concentration, quantities, or flow during normal operation.
(P) (1) Any waters or wastes containing compatible or toxic pollutants, which singly or by interaction with other pollutants, exceed limitations established by the city for the following reasons:
(a) To prevent treatment process pass-through of pollutants which violate water quality standards of the receiving stream.
(b) To prevent injury or inhabitation of the treatment process or sludge handling facilities.
(c) To prevent contamination of the wastewater sludge and interference with the sludge disposal process.
(d) To comply with federal EPA categorical pretreatment standards.
(2) Toxic pollutants shall include, but are not limited to, any substance identified on the Federal EPA Priority Pollutant and State of Michigan Critical Materials List. Methods used by the city to establish limitations shall be in accordance with the latest guidance of the Michigan Department of Natural Resources. Limitations may be adjusted to reflect the presence of pollutants in the users' intake water supply in accordance with part 403.15 of the U.S. Environmental Protection Agency General Pretreatment Regulations of January 28, 1981.
(Q) Any waters or wastes exceeding the following characteristics:430 mg/l BOD(S), 615 mg/l S.S., 8 mg/l P, 36 mg/L ammonia nitrogen.
(R) Heavy metal discharge limits exceeding the following:
POLLUTANT | Local Limit (Daily Max) (mg/l) |
POLLUTANT | Local Limit (Daily Max) (mg/l) |
Arsenic | 0.25 |
Cadmium | 0.57 |
Chromium, Total | 1.28 |
Copper | 0.59 |
Cyanide | 0.09 |
Lead | 6.0 |
Mercury | ND* |
Molybdenum | 2.84 |
Nickel | 1.60 |
Selenium | 1.49 |
Silver | 0.89 |
Zinc | 0.4 |
*Non-Detectable is defined as at or below the quantification level applicable under 40 CFR Part 136 as determined by the City WRRF Superintendent. Mercury sampling procedures, preservation and handling, and analytical protocol for compliance monitoring of a user's discharge shall be in accordance with the applicable US EPA method as determined by the Superintendent. The quantification levels shall be 0.2 µg/l or 0.5 ng/l, depending on the method required by the Superintendent, unless higher levels are approved by the Superintendent because of sample matrix interference. Any discharge of mercury at or above the required level of quantification is a specific violation of this chapter. | |
(Ord. 622, passed 3-4-85; Am. Ord. 1074, passed 9-27-21) Penalty, see § 51.999