(a)   Unpolluted Water. No person shall discharge or cause to be discharged any storm water, surface water, groundwater, roof runoff, subsurface drainage, cooling water, or unpolluted industrial process waters into any sanitary sewer. Storm water and all other unpolluted drainage shall be discharged into such sewers as are specifically designated as combined sewers or storm sewers or to a natural outlet approved by the City Manager, and in compliance with rules and procedures of various agencies of the State of Michigan. Industrial cooling water or unpolluted process waters may be discharged, upon approval of the City Manager, into a storm sewer, combined sewer or natural outlet. The City has the right to exclude industrial or commercial waste in whole or in part, for any reason.
      (b)   Limitations on Wastewater Strength. Upon the promulgation of the national categorical pretreatment standards, alternative discharge limits, or other Federal or State limitations for a particular industrial subcategory, the pretreatment standard more stringent than the limitations imposed under this chapter for sources in that subcategory shall be considered part of this chapter. The City shall notify all affected users of the applicable reporting requirements.
      (c)   Dilution. No discharger shall increase the use of potable or process water in any way, nor mix separate waste streams for the purpose of diluting a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the standards set forth in this chapter.
      (d)   Interceptors. Grease, oil and sand interceptors shall be provided when, in the opinion of the City Manager and/or the SWRC, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts or any inflammable wastes, sand, or other harmful ingredients, except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the City Manager and/or the SWRC and shall be located so as to be readily accessible for cleansing and inspection. Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be substantially constructed, water-tight, and equipped with easily removable covers which, when bolted in place, shall be gas-tight and water-tight.
      (e)   Interceptor Maintenance. Where installed, all grease, oil and sand interceptors shall be maintained by the owner, at his or her expense, in continuously efficient operation at all times.
      (f)   Preliminary Treatment Facilities. The admission into the public sewers of any waters or wastes having (1) a five-day BOD greater than 300 parts per million by weight (300 ppm), or (2) containing more than 360 parts per million (360 ppm) by weight of suspended solids, or (3) containing more than seven parts per million (7 ppm) by weight of total phosphorus, or (4) containing any quantity of substances having the characteristics described in Section 1046.04, or (5) having a daily average flow greater than two percent of the average daily sewage flow to the POTW, shall be subject to the review and approval of the City Council and/or the SWRC. Where necessary in the opinion of the City and/or the SWRC, the owner shall provide, at his or her expense, such preliminary treatment as may be necessary to (1) reduce the BOD to 300 parts per million by weight, and the suspended solids to 360 parts per million by weight, and the total phosphorus to seven parts per million by weight, or (2) reduce objectionable characteristics or constituents to within the maximum limits provided for in subsection (b) hereof or Section 1046.04, or (3) control the quantities and rates of discharge of such waters or wastes. Plans, specifications and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for approval of the City Council and/or of the SWRC of the State of Michigan, and no construction of such facilities shall be commenced until said approvals are obtained in writing.
   (g)   Maintenance of Preliminary Facilities. Where preliminary treatment facilities are provided for any waters or wastes, they shall be maintained in satisfactory and effective operation by the owner at his or her expense.
   (h)   Control Manholes. When required by the City, the owner of any property served by a building sewer carrying industrial wastes shall install a suitable control manhole in the building sewer to facilitate observation, sampling, and measurement of the wastes. Such 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 installed by the owner at his or her expense and shall be maintained by him or her so as to be safe and accessible at all times.
   (I)   Measurements and Tests. All measurements, tests, and analyses of the characteristics of water and wastes to which reference is made in subsections (b) and (f) hereof and Section 1046.04 shall be determined in accordance with Standard Methods for the Examination of Water and Wastewater and shall be determined at the control manhole provided for in subsection (h) hereof or upon suitable samples taken at said 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. In addition to the Standard Methods, all testing should conform with Guidelines Establishing Test Procedures for Analysis of Pollutants, as published on October 16, 1973, Federal Register (40 CFR 136). The strength of such wastes shall be determined by composite sampling at the owner's expense over a period of time sufficient to generate a representative sample.
   (j)   Agreements. Discharge limits to be maintained by any nondomestic user for pollutants not specified in this chapter may be specified in contracts entered into between the discharger and the City.
   (k)   Accidental Discharges. Each discharger shall provide protection from accidental discharge or prohibited or regulated materials or substances established by this chapter. Where there is potential for accidental discharge of prohibited materials into the POTW, then spill prevention shall be provided and maintained at the discharger's cost and expense. Detailed plans showing facilities and operating procedures to provide this protection shall be submitted to the City for review and shall be approved by the City before construction of the facility. All users subject to this provision shall complete a spill prevention program within ninety days of enactment of this chapter. No discharger who discharges to the POTW after the effective date of this chapter shall be permitted to introduce pollutants into the system until accidental discharge protection procedures have been approved by the Authority. Review and approval of such plans and operating procedures by the City shall not relieve the user from the responsibility to modify its facility as necessary to meet the requirements of this chapter.
   (l)   Notification of Accidental Discharge. Dischargers shall notify the sewage works by telephone immediately upon the occurrence of a "slugload" or accidental discharge of substances prohibited by this chapter. The notification shall include the location of the discharge, the date and time thereof, the type of waste, the concentration and volume, and recommended corrective action. Following an accidental discharge, it will be the responsibility of the user to submit a written report to the City detailing the cause of the discharge and the measures being implemented to prevent a recurrence. Submittal of the report will not relieve the user of liability for any expense, loss or drainage to the sewage works, nor fines, civil penalties, or other liabilities imposed upon the City as a result of the accident.
   (m)   Protection From Drainage. No unauthorized person shall maliciously, willfully or negligently break, damage, destroy, uncover, deface or tamper with any structure, appurtenance, or equipment which is a part of the Municipal sewage system or treatment plant. (Ord. 22A. Passed 8-19-85.)