A. 
All premises connected to the POTW shall meet the following requirements:
(1) 
Minimum size of the building drain/sewer, including required cleanouts, shall be four inches or greater in diameter;
(2) 
A grease interceptor, with a maintenance cleaning schedule appropriate for its intended use, shall be required to receive the drainage from fixtures and equipment having grease-laden waste, located in food preparation areas such as in restaurants, commercial kitchens, bars, clubs or similar facilities. The grease interceptor shall not be less than a three-compartment, one-thousand-gallon system, or equivalent, unless the City Manager approves an alternative system. Food waste grinders shall not discharge to the building drainage system through the grease interceptor, unless the interceptor is appropriately sized to handle the solids loading and approved by the plumbing code. Food waste grinders shall not discharge to the building drainage system through the grease interceptor. Grease interceptors shall be cleaned and maintained in accordance with BMP. At no time shall the level of grease and sludge in any compartment of the trap be greater than 25% of the tank liquid level. Proof of maintenance and cleaning shall be available for review upon request.
(3) 
Sand traps and similar interceptors for removal of heavy solids by commercial users, as determined by the City Manager, shall be designed and installed, according to the City Sand Trap for Garages design specifications. They shall be located as to be readily accessible for cleaning and shall have a water seal of not less than six inches. Sand traps and similar interceptors shall be cleaned and maintained in accordance with BMP. Proof of maintenance and cleaning shall be available for review upon request.
(4) 
Oil/water separators are required at repair garages, gasoline stations with grease racks, grease pits or work racks and at factories, or other facilities, where oily and flammable liquid wastes are produced. Separators shall be installed into which all oil-bearing, grease-bearing or flammable wastes shall be discharged before emptying in the building drainage system or other point of disposal. Oil separators shall have a depth of not less than two feet below the invert of the discharge drain. The outlet opening of the separator shall not have less than an eighteen-inch water seal. An alternative design may be approved by the Plumbing Inspector, as provided for by the Plumbing Code. Oil/water separators shall be cleaned and maintained in accordance with BMP. Proof of maintenance and cleaning shall be available for review upon request.
B. 
No discharger shall introduce into the POTW any pollutant(s) which cause pass-through or interference. The following general and specific prohibitions of this section apply to each discharger introducing pollutants into the POTW whether or not the discharger is subject to any national, state or local pretreatment standards or requirements. Pollutants, substances, or wastewater prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW.
(1) 
Pollutants which create a fire or explosion hazard in the POTW, including, but not limited to, waste streams with a closed cup flashpoint of less than 140° F. or 60° C. using the test methods specified in 40 CFR 261.21.
(2) 
Solid or viscous pollutants in amounts that will cause obstruction to the flow in the POTW or results in interference.
(3) 
Pollutants which cause corrosive structural damage to the POTW, but in no case discharges with a pH lower than 5.0 or a pH greater than 10.5. These pH limits will be evaluated annually as part of the rate study and the limits set forth in this section will be revised as deemed necessary.
(4) 
Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction, to injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals or exceed the limitations set forth in a categorical pretreatment standard.
(5) 
Any noxious or malodorous liquids, gases or solids which either singly, or by interaction, are capable of creating a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for maintenance and repair.
(6) 
Any substance which, alone or in conjunction with a discharge or discharges from other sources, may cause a violation of the POTW's NPDES permit or any applicable state or federal water quality standards or interferes with any treatment process, or causes treatment residues, sludges or scums, to be unsuitable for reclamation or reuse or to interfere with the reclamation process. In no case shall a substance discharged to the POTW cause the POTW to be in noncompliance with sludge use or disposal criteria, guidelines or regulations developed under Section 405 of the Clean Water Act, any criteria, guidelines, or regulations affecting sludge use or disposal developed pursuant to the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act or state standards applicable to the sludge management method being used.
(7) 
Any substance with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
(8) 
Heat in amounts that will inhibit biological activity in the POTW resulting in interference, but, in no case heat in such quantities that the temperature at the headworks of the POTW exceeds 40° C. (104° F.) unless the Michigan Department of Environmental Quality (MDEQ), upon the request of the POTW, approves the alternative temperature limits.
(9) 
Any pollutant, including oxygen demanding pollutants (BOD, etc.), released in a discharge at a flow rate and/or pollutant concentration which will cause interference with the POTW.
(10) 
Any unpolluted water including, but not limited to, noncontact cooling water, unless a discharge authorization is approved by the City Manager.
(11) 
Any wastewater containing any radioactive wastes or isotopes of such half-life or concentration except as set forth in 10 CFR Part 20. Introduction of radioactive wastes that interfere with the operation of the POTW including, but not limited to, the use and disposal of sludge, the recycling of any and all waste products, or if the discharge causes the POTW to violate any local, State or Federal laws.
(12) 
Pollutants which result in the presence of toxic gases, vapors or fumes within the POTW in a quantity that may cause acute worker health and safety problems.
(13) 
Any discharge of petroleum oil, non-biodegradable cutting oil, animal fat, vegetable fat, oil, grease, products of mineral oil or any combination thereof at a concentration of greater than 100 milligrams per liter, unless it can be demonstrated that matrix interference is responsible for levels greater than this amount, but, in no case in amounts that will cause an obstruction, interference or pass-through in the POTW.
(14) 
Any substances not identified in Subsection B(13) above, that will become solid or viscous after entering the POTW.
(15) 
Any effluent having an average daily flow greater than 2% of the POTW's average daily flow. The City Manager, upon review, may approve greater discharges subject to conditions as authorized by this Part 2 or special conditions he/she deems necessary in order to preserve and protect public health, safety and welfare, subject to conformance with the applicable state and federal law.
(16) 
Any trucked or hauled pollutants, except at discharge points designated by the City Manager.
(17) 
Any detectable level of mercury using EPA Method 245.1 or 245.2 with a detection limit not to exceed 0.2 µg/l unless the user can demonstrate that matrix interference prevents the attainment of this level. Mercury sampling procedures, preservation and handling, and analytical protocol for compliance monitoring shall be in accordance with U.S. EPA Method 245.1 or 245.2. In the event that mercury is detected, the user shall develop and implement a mercury elimination plan including elements deemed necessary by the City Manager to progress toward the goal of no detectable discharge of mercury. For users whose operation and discharge characteristics are substantially similar, a group mercury elimination plan may be acceptable. Dental facilities shall comply with Public Act 503 of 2008, MCLA § 333.16631, and all best management practices promulgated by the Michigan Department of Community Health in conjunction with the Michigan Department of Environmental Quality.
(18) 
There shall be no discharge to the POTW of groundwater that has been contaminated with gasoline and related petroleum products that would qualify for a State of Michigan general discharge permit for gasoline and related petroleum products in accordance with Rule 2191 promulgated pursuant to Act 451 of the Public Acts of Michigan of 1994, as amended, Part 31, except where no other discharge option exists. If discharge to the POTW is desired under these conditions, the discharger must submit a wastewater discharge permit application as specified in § 313-20 which may be approved by the City Manager. Upon approval a permit will be issued with appropriate conditions as set forth in § 313-24. The total BTEX concentration shall not exceed 20 micrograms per liter and the MTBE concentration shall not exceed 20 micrograms per liter.
(19) 
Disposal of septage waste into the POTW is prohibited, except as in accordance with the septage waste receiving plan; the City Manager may authorize disposal of portable containers of domestic waste, including waste from recreational vehicles. Septage wastes are to be discharged only at designated locations in accordance with the septage waste receiving plan.
(20) 
Sludge from an industrial or commercial pretreatment system shall not be placed into the POTW. Such sludge shall be disposed of by a licensed hauler in a site approved by the Michigan Department of Environmental Quality (MDEQ).
(21) 
Any substance that causes excessive foaming in the POTW.
(22) 
Medical wastes, except as specifically authorized according to Part 138, Medical Waste Regulatory Act of the Michigan Public Health Code, 1978 PA 368, as amended.
(23) 
Any detectable level of PCB using EPA Method 608 with a detection limit not to exceed 0.1 µg/l unless the user can demonstrate that matrix interference prevents the attainment of this level. PCB sampling procedures, preservation and handling, and analytical protocol for compliance monitoring shall be in accordance with U.S. EPA Method 608.
(24) 
Bacteriological, chemical or enzymatic products shall not be added to facility discharge or be used to maintain or clean grease interceptors or grease traps, unless approved by the City Manager.
C. 
Bypass is prohibited, except in cases where the bypass was unavoidable to prevent a loss of life, personal injury, or severe property damage, and where there are no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities, retention of untreated wastes or maintenance during normal periods of equipment downtime. This condition is not satisfied if adequate backup equipment should have been installed in the exercise of reasonable engineering judgment to prevent a bypass that occurred during normal periods of equipment downtime or preventive maintenance. In cases where a bypass may occur, it would be subject to the following conditions:
(1) 
Anticipated bypass. If an industrial user knows in advance of the need for a bypass, the user shall submit prior notice to the POTW, if possible, at least 10 days before the date of the bypass. Upon notification, the City Manager shall make a determination whether to allow the discharge.
(2) 
Unanticipated bypass. An industrial user shall immediately notify the City Manager of the occurrence of any unanticipated bypass. The City Manager shall make a determination whether to allow the discharge to continue. A written submission shall also be provided within five days of becoming aware of the bypass. The written submission shall contain a description of the bypass and its cause, the dates and, if the bypass has not been corrected, the anticipated time it is expected to continue, and steps taken or planned to reduce, eliminate and prevent recurrence of the bypass.
D. 
Any discharger shall have an affirmative defense in any action brought against it alleging a violation of the general and specific prohibitions established in § 313-18B(2), (8), (9), and (13), where the discharger can demonstrate that:
(1) 
It did not know or have reason to know that its discharge, alone or in conjunction with a discharge or discharges from other sources, would cause pass-through or interference and;
(2) 
Either:
(a) 
A local limit designed to prevent pass-through or interference was developed for each pollutant in the user's discharge that caused pass-through or interference and the user was in compliance with each such local limit immediately before and during the pass-through or interference; or
(b) 
A local limit was not applicable and immediately before and during the pass-through or interference the user's discharge did not substantially change in volume or constituents from the user's previous discharges when the POTW was regularly in compliance with its NPDES permit and, in the case of interference, all applicable requirements for sludge use or disposal.
A. 
Upon the promulgation of the federal categorical pretreatment standards for a particular industrial subcategory, the federal standard, if more stringent than limitations imposed under this Part 2 for sources in that subcategory, shall immediately supersede the limitations imposed under this Part 2. Compliance by existing sources with categorical pretreatment standards shall be within three years of the date the standard is effective unless a shorter compliance time is specified in the appropriate subpart of 40 CFR Chapter I, Subpart N. A new source shall install, and have in operation at start-up, all pollution control equipment required to meet applicable categorical pretreatment standards before beginning discharge. When the applicable categorical pretreatment standards are expressed in terms of mass of pollutant per unit of production, the City Manager may convert these limits to equivalent limitations expressed either as a mass of pollutant discharged per day or effluent concentration for purposes of calculating effluent limitations applicable to individual industrial users as set forth in 40 CFR 403.6(c)(2) to (7) and Rule 323.2311(5) of the MAC. In situations in which nonregulated waste streams are intermixed with the regulated waste stream, the City Manager may use the combined waste stream formula to develop equivalent discharge limits. Whenever equivalent limits are used, they shall be deemed pretreatment standards in determining compliance with the standards. The City Manager shall notify all affected users of the applicable reporting requirements under 40 CFR 403.12 and Rule 323.2310 of the MAC. An application for modification of the categorical pretreatment standards may be considered for submittal to the Regional Administrator of EPA by the City Manager when the system achieves consistent removal of the pollutants as defined by 40 CFR 403.7 and Rule 323.2313 of the MAC.
B. 
No industrial user shall increase the use of water or dilute a discharge as a substitute for adequate treatment to achieve compliance with a pretreatment standard or requirement.
C. 
Supplementary limitations.
(1) 
Supplementary limits were established in accordance with EPA guidance and the Michigan Department of Environmental Quality (MDEQ) approval criteria. Specific permit limits for BOD, total suspended solids, total phosphorus, and ammonia as NH3-N, are specified by individual discharge permits and were derived from the industrial allocable portion of the MAHLs listed in Table 1.
Table 1. Maximum Allowable Headworks Loadings
Materials
Loading
(pounds/day)
Biochemical oxygen demand (BOD)
160,800
Total suspended solids (TSS)
141,300
Total phosphorus (TP)
6,990
Ammonia nitrogen (NH3-N)
15,100
(2) 
Table 2 contains a list of technically based local limits derived from the industrial allocable portion of the noncompatible pollutant MAHLs limits for toxic pollutants. For users subject to categorical pretreatment standards, which include the following parameters, the following limits, if more restrictive, shall apply, both to the categorically regulated process flow as well as any other flows not specifically regulated by categorical pretreatment standards. For all other dischargers, these limits shall apply to the total flow from each connection to the POTW, except silver which is a process discharge limit as noted. All measurements to determine compliance with these limits shall be performed in accordance with EPA approved methods found in 40 CFR 136. The monthly average shall be the average of all samples analyzed by EPA approved methods during a calendar month.
Table 2
Local Limits
Inorganic
Daily Maximum
(mg/L)
Monthly Average
(mg/L)
Total arsenic
1.46
NA
Total cadmium
0.817
NA
Total chromium
4.0
NA
Hexavalent chromium
0.72
NA
Total copper
1.5
NA
Total cyanide
1.0
NA
Total lead
1.5
NA
Total mercury
ND1
NA
Total molybdenum
3.4
NA
Total nickel
1.5
1.1
Total selenium
2.3
1.67
Total silver
6202
NA
Total zinc
2.6
2.0
Organic
Daily Maximum
(mg/L)
Monthly Average
(mg/L)
Total phenols
3.26
NA
Polychlorinated biphenyls
ND3
NA
Tetrachloroethylene
0.25
NA
Trichloroethylene
0.16
NA
MTBE
0.02
NA
NA
Not applicable
(1)
Nondetectable or as specified in § 313-18B(17)
(2)
Process discharge limit for photo processors and x-ray machines sampled from discharge of silver recovery unit. The analysis of these sample matrixes, photo processing and x-ray machine wastes for silver shall be performed on an unpreserved and undigested sample or an alternative preservation and analytical method that does not interfere with the measurement of silver.
(3)
Nondetectable per EPA Method 608 with a detection limit not to exceed 0.1 µg/l unless higher levels are appropriate due to matrix interference
(3) 
For compatible pollutants, the City Manager shall establish specific concentration limits, when necessary, that are adequate to insure that the industrial allocable portion of the MAHL listed herein is not exceeded. Any requests for specific limits must be made at the time of permit application or renewal and such a determination will be made solely by the City Manager. The establishment of any such limits shall not create any vested right or property rights for the user. Accordingly, no right of appeal from such a determination will exist and the approval may be terminated, modified or subjected to special condition either at time of approval or thereafter, at the discretion of the City Manager.
(4) 
The City Manager may implement a system for setting special alternative specific limits for batch discharges.
(a) 
Special alternative specific limits may be approved when all of the following conditions are met:
[1] 
The user requests a special alternative specific limit through the special alternative limit process.
[2] 
The City Manager makes a determination that adequate treatment capacity exists to allow this special alternative specific limit consistent with the MAHL for those pollutants present.
(b) 
In no event shall a special discharge permit be granted or effective which authorizes a discharge in excess of the limitations imposed by any applicable final federal or state pretreatment standard or discharge limit. In addition, the City Manager shall not consider any request for an increase above any limits that were calculated based on health or safety criteria.
(5) 
The City Manager may develop BMPs by ordinance or in individual wastewater discharge permits to implement local limits and the requirements of § 313-18.
D. 
Accidental discharges.
(1) 
Prevention plan.
(a) 
Industrial and commercial users shall provide protection from accidental discharge of materials which may interfere with the POTW by developing spill prevention plans. If the materials of concern are listed in Table 1 of Rule 324.2009 of the MAC, as amended, a pollution incident prevention plan (PIPP) pursuant to Part 31 of the Natural Resources and Environmental Protection Act, Act 451 of the Public Acts of Michigan of 1994, as amended (MCLA § 324-3101 et seq.), and Rule 324.2006 of the MAC, as amended, shall be developed and maintained. A copy of the PIPP must be made available upon request of the City Manager. Facilities necessary to implement these plans shall be provided and maintained at the owner's or industrial or commercial user's expense.
(b) 
Industrial and commercial users who store hazardous substances shall not discharge to the POTW after the effective date of this Part 2 until a State of Michigan required PIPP has been submitted. Receipt of such plan shall not relieve the industrial or commercial user from complying with all other laws and regulations governing the use, storage and transportation of hazardous substances.
(2) 
The City Manager shall evaluate each significant industrial user at least once every two years, and other industrial users as necessary, to determine whether such user needs a plan to control slug discharges. If the City Manager decides that a slug control plan is needed, the plan shall contain at a minimum the following elements:
(a) 
Description of discharge practices, including nonroutine batch discharges;
(b) 
Description of stored chemicals;
(c) 
Procedures for immediately notifying the POTW of slug discharges, including any discharge that would violate a prohibition under §§ 313-18 and 313-19, with procedures for follow-up written notification within five days;
(d) 
When deemed necessary, procedures to prevent adverse impact from accidental spills, including inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building containment structures or equipment, measures for containing toxic organic pollutants and/or measures and equipment for emergency response.
(3) 
Any upset or accidental discharge shall be reported to the City Manager immediately upon occurrence. A detailed report shall be filed within five days. The report shall include location of the upset or discharge, date and time thereof, type of waste, concentration, volume and corrective actions. Failure to file a report shall be a separate violation of this Part 2.
(4) 
Signs shall be permanently posted in conspicuous places on discharger's premises, advising employees whom to call in the event of a slug, upset or accidental discharge. Employers shall instruct all employees who may cause, or discover such upset or discharge, with respect to emergency notification procedure.
(5) 
Significant industrial users are required to notify the City Manager prior to any changes at its facility affecting the potential for a slug discharge.