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This subchapter has as its purpose the protection of public health and safety and because of the widely varying quality characteristics of the sewage discharged by different users of the public sewer and the publicly owned treatment works, it is the objective of the subchapter to impose sewage charges which reflect the cost of treating sewage strength factors as well as sewage volume. These charges to commercial and industrial users will be in the form of a payment called a surcharge and will reflect industries’ equitable costs of waste water treatment in excess of the strength of domestic sewage. Sewage charges will be based on a volume rate and surcharge based on volume of discharge and the strength of BOD, suspended solids and phosphorus or other pollutants present in the waste water. In the event other pollutants are required to be surcharged under this subchapter, authorized variances, or by special arrangement with the owner of the publicly owned treatment works, the rules and regulations adopted herein will apply, said rules and regulations being on file with the city clerk (or other appropriate municipal officer).
(Ord. 566, sec. i; adopted 2/2/81, effective (published) 2/19/81)
This subchapter is adopted pursuant to and in accordance with the requirements of Federal Law Public Act 92-500, and applicable Federal Regulations, the requirements of the Settlement Agreement in United States of America v City of Detroit, et al, Civil Action #771100.
(Ord. 586, sec. ii)
Unless the context specifically indicates otherwise, the meaning of the terms used in this subchapter shall be as follows:
(A) BIOCHEMICAL OXYGEN DEMAND (BOD). The quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure, five days at 20°C expressed in terms of weight and concentration (milligrams per liter (mg/l)), as measured by standard methods.
(B) COMMERCIAL USER. Non-domestic sources of indirect discharge other than industrial users, as defined herein including but not limited to the following: a publicly or privately owned facility where persons are engaged in the exchange or sale of goods or services, hospitals, retail establishments, schools and facilities operated by local and state governments.
(C) INDIRECT DISCHARGE. The discharge or the introduction of non-domestic pollutants from any source regulated under Section 307 (b) or (c) of the Federal Water Pollution Control Act, P.L. 92-500, as amended, into the public waste treatment system.
(D) INDUSTRIAL USER. A source of indirect discharge under regulations issued pursuant to Section 402 of the Act (33 USC 1342), which source originates from, but is not limited to, facilities engaged in industry, manufacturing, business, trade or research, including the development, recovery or processing of natural resources.
(E) INDUSTRIAL WASTE. Any liquid, solid or gaseous waste or form of energy or combination thereof resulting from any process of industry, manufacturing, business, trade or research, including the development, recovery or processing of natural resources.
(F) P. Phosphorous in the waste expressed in terms of milligrams per liter (P.P.M.).
(G) POLLUTANT. Any dredged spoil, solid waste, incinerator residue, sewage, garbage, sewage sludge, munitions chemical wastes, biological materials, radioactive materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt and industrial, municipal and agricultural waste discharged into water.
(H) PUBLIC SEWER. A common sewer controlled by a governmental agency or public utility.
(I) SUSPENDED SOLIDS. The total suspended matter that floats on the surface of, or is suspended in, water, waste water or other liquids, and which is removable by laboratory filtering as measured according to standard methods.
(J) WASTE WATER or SEWAGE. Spent water which may be a combination of the liquid and water-carried wastes from residences, commercial buildings, industrial plants, institutions, or other land uses, including drainage water inadvertently present in said waste.
(K) WASTE WATER SYSTEM or SEWER SYSTEM. Any part or all of the property, structures, equipment, sewers, materials and/or appurtenances used in conjunction with the collection and disposal of waste water, including the publicly owned treatment work (POTW).
(Ord. 586, sec. iii)
It is ordained that the Schedule of Industrial Waste Pollutant Strength Surcharges is hereby adopted and made effective for users of the waste water system of the City of Inkster, Michigan. Said surcharges to be computed as follows:
COMPUTATION OF INDUSTRIAL WASTE POLLUTANT
STRENGTH SURCHARGE
The industrial waste pollutant strength surcharge shall be computed in accordance with the following formula:
SC = 0.0624 V a (BOD-250) + b (TSS-300) + c (P-12)
WHERE:
SC = Pollutant strength surcharge fee in dollars for the billing period.
V = Volume of waste discharged in the billing period in Mcf (1000 cubic feet).
`BOD’ = Five-day biochemical oxygen demand of the waste expressed in milligrams per liter (ppm).
`TSS’ = Total Suspended solids in the waste expressed in milligrams per liter (ppm).
`P’ = Phosphorus in the waste expressed in milligrams per liter (ppm).
a, b, c = Surcharge rates, $/pound for treating BOD, TSS and P respectively.
0.0624 = Factor which converts Mcf to MM lbs
a = $0.082/pound
b = 0.083/pound
c = 1.321/pound
For purposes of surcharge computation, the values of pollutant strengths shall not be less than the allowable values; the allowable values are:
BOD - 250
TSS - 300
P - 12
The total sewerage charge for a particular industry would be the sum of the base flow charge and the surcharge would be calculated from the following formula:
UC = V(R)+SC
WHERE:
UC = Total sewerage charge for the billing period in dollars.
V = Volume of waste discharged in billing period of Mcf
R = Basic flow sewage rate is as established by resolution of the City Council, the City of Inkster.
SC = Surcharge in dollars as computed above.
(Ord. 586, Sec. iv)
In accordance with the basic Service Agreement between the City of Inkster, the County of Wayne and the Wayne County Board of Public Works or other properly designated agent of the County of Wayne named pursuant to Public Acts 342 of 1939 and 185 of 1957, this subchapter provides that any person, firm or corporation discharging waste water into the publicly owned sewer system shall comply with the standards, rules and regulations controlling the quality or quantity of discharge of waste water into said system. Said standards, rules and regulations shall be as established from time to time by the county and/or its designated agent.
(Ord. 586, sec. V; adopted 2/2/81, effective (published) 2/19/81.)