City of Monett, MO Article IV Discharges Into Sewerage System — Generally

Section 705.370 Method of Discharging Stormwater, Surface Water, Unpolluted Industrial Process Water, Etc., Generally.

[R.O. 2012 §705.370; CC 1979 §26-26; Ord. No. A-2692 §§5 — 6, 3-11-1969; Ord. No. 8321, 10-20-2014]

No person shall discharge or cause to be discharged any stormwater, surface water, roof runoff, groundwater, subsurface drainage, cooling water or unpolluted industrial process water to any sanitary sewer. Such stormwater and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as storm sewers or to a natural outlet approved by the Superintendent. Industrial cooling water or unpolluted process waters may be discharged, upon approval of the Superintendent, to a storm sewer or natural outlet.

Section 705.380 Discharge of Untreated Sanitary Sewage, Industrial Wastes, Etc., Into Natural Outlet or Storm Sewer.

[R.O. 2012 §705.380; CC 1979 §26-27; Ord. No. A-2692 §7, 3-11-1969; Ord. No. 8321, 10-20-2014]

It shall be unlawful to discharge into any natural outlet or storm sewer within the City or in any area under the jurisdiction of the City any sanitary sewage, industrial wastes or other polluted waters, except where suitable treatment has been provided in accordance with the provisions of this Article.

Section 705.390 Grease, Oil and Sand Interceptors.

[R.O. 2012 §705.390; CC 1979 §26-28; Ord. No. A-2692 §8, 3-11-1969; Ord. No. 8321, 10-20-2014]

Grease, oil and sand interceptors shall be provided at the owner's expense when, in the opinion of the Superintendent, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts or any flammable wastes, sand and 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 Superintendent and shall be so located as to be readily and easily accessible for cleaning and inspection.

Section 705.400 Prohibited Discharge Standards.

[R.O. 2012 §705.400; CC 1979 §26-29; Ord. No. A-2692 §9, 3-11-1969; Ord. No. A-4064 §2, 6-21-1979; Ord. No. A-5734 §III, 6-18-1993; Ord. No. 8321, 10-20-2014]

A. General Prohibitions. No user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass-through or interference. These general prohibitions apply to all users of the POTW whether or not they are subject to categorical pretreatment standards or any other National, State, or local pretreatment standards or requirements.

B. Specific Prohibitions. No user shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:

1. Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, waste streams with a closed cup flashpoint of less than one hundred forty degrees Fahrenheit (140° F.) [sixty degrees Celsius (60° C.)] using the test methods specified in 40 CFR 261.21;

2. Wastewater having a pH less than 6.0 or more than 9.5, or otherwise causing corrosive structural damage to the POTW or equipment;

3. Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference [but in no case solids greater than three (3) inch(es) or seven (7) centimeter(s) in any dimension];

4. Pollutants, including oxygen demanding pollutants (BOD, etc.), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;

5. Wastewater having a temperature greater than one hundred fifty degrees Fahrenheit (150° F.) [sixty-five degrees Celsius (65° C.)] or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed one hundred four degrees Fahrenheit (104° F.) [forty degrees Celsius (40° C.)];

6. Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass-through;

7. 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;

8. Trucked or hauled pollutants, except at discharge points designated by the Superintendent.

9. Noxious or malodorous liquids, gases, solids, or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair;

10. Wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant's effluent, thereby violating the City's NPDES permit;

11. Wastewater containing any radioactive wastes or isotopes except in compliance with applicable State or Federal regulations;

12. Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, non-contact cooling water, and unpolluted wastewater, unless specifically authorized by the Superintendent;

13. Sludges, screenings, or other residues from the pretreatment of industrial wastes;

14. Medical wastes, except as specifically authorized by the Superintendent in an individual wastewater discharge permit;

15. Wastewater causing, alone or in conjunction with other sources, the treatment plant's effluent to fail toxicity test;

16. Detergents, surface active agents, or other substances which might cause excessive foaming in the POTW;

17. Fats, oils, or greases of animal or vegetable origin in concentrations greater than one hundred (100) milligrams per liter;

18. Maximum limits.

a. Any waters or wastes:

(1) Having a five-day biochemical oxygen demand greater than three hundred (300) parts per million by weight;

(2) Containing more than three hundred fifty (350) parts per million by weight of suspended solids; or

(3) Having an average daily flow greater than two percent (2%) of the average sewage flow of the City, shall be subject to the review of the Superintendent.

b. Where necessary in the opinion of the Superintendent, the owner shall provide, at his/her expense, such preliminary treatment as may be necessary to:

(1) Reduce the biochemical oxygen demand to three hundred (300) parts per million by weight;

(2) Reduce the suspended solids to three hundred fifty (350) parts per million by weight; 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 the approval of the Superintendent and no construction of such facilities shall be commenced until such approvals are obtained in writing.

C. 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.

Section 705.402 National Categorical Pretreatment Standards.

[Ord. No. 8321, 10-20-2014]

A. Users must comply with the categorical pretreatment standards found at 40 CFR Chapter I, Subchapter N, Parts 405-471.

1. Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the Superintendent may impose equivalent concentration or mass limits in accordance with Section 705.402(A)(4) and (5).

2. When the limits in a categorical pretreatment standard are expressed only in terms of mass of pollutant per unit of production, the Superintendent may convert the limits to equivalent limitations expressed either as mass of pollutant discharged per day or effluent concentration for purposes of calculating effluent limitations applicable to individual industrial users.

3. When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Superintendent shall impose an alternate limit in accordance with 40 CFR 403.6(e).

4. When a categorical pretreatment standard is expressed only in terms of pollutant concentrations, an industrial user may request that the City convert the limits to equivalent mass limits. The determination to convert concentration limits to mass limits is within the discretion of the Superintendent. The City may establish equivalent mass limits only if the industrial user meets all the conditions set forth in Subsections (A)(4)(a)(1) through (5) below.

a. To be eligible for equivalent mass limits, the industrial user must:

(1) Employ, or demonstrate that it will employ, water conservation methods and technologies that substantially reduce water use during the term of its individual wastewater discharge permit;

(2) Currently use control and treatment technologies adequate to achieve compliance with the applicable categorical pretreatment standard, and not have used dilution as a substitute for treatment;

(3) Provide sufficient information to establish the facility's actual average daily flow rate for all waste streams, based on data from a continuous effluent flow-monitoring device, as well as the facility's long-term average production rate. Both the actual average daily flow rate and the long-term average production rate must be representative of current operating conditions;

(4) Not have daily flow rates, production levels, or pollutant levels that vary so significantly that equivalent mass limits are not appropriate to control the discharge; and

(5) Have consistently complied with all applicable categorical pretreatment standards during the period prior to the industrial user's request for equivalent mass limits.

b. An industrial user subject to equivalent mass limits must:

(1) Maintain and effectively operate control and treatment technologies adequate to achieve compliance with the equivalent mass limits;

(2) Continue to record the facility's flow rates through the use of a continuous effluent flow-monitoring device;

(3) Continue to record the facility's production rates and notify the Superintendent whenever production rates are expected to vary by more than twenty percent (20%) from its baseline production rates determined in Subsection (A)(4)(a)(3) of this Section. Upon notification of a revised production rate, the Superintendent will reassess the equivalent mass limit and revise the limit as necessary to reflect changed conditions at the facility; and

(4) Continue to employ the same or comparable water conservation methods and technologies as those implemented pursuant to Subsection (A)(4)(a)(1) of this Section so long as it discharges under an equivalent mass limit.

c. When developing equivalent mass limits, the Superintendent:

(1) Will calculate the equivalent mass limit by multiplying the actual average daily flow rate of the regulated process(es) of the industrial user by the concentration-based daily maximum and monthly average standard for the applicable categorical pretreatment standard and the appropriate unit conversion factor;

(2) Upon notification of a revised production rate, will reassess the equivalent mass limit and recalculate the limit as necessary to reflect changed conditions at the facility; and

(3) May retain the same equivalent mass limit in subsequent individual wastewater discharge permit terms if the industrial user's actual average daily flow rate was reduced solely as a result of the implementation of water conservation methods and technologies, and the actual average daily flow rates used in the original calculation of the equivalent mass limit were not based on the use of dilution as a substitute for treatment pursuant to Section 705.540.

5. The Superintendent may convert the mass limits of the categorical pretreatment standards of 40 CFR Parts 414, 419, and 455 to concentration limits for purposes of calculating limitations applicable to individual industrial users. The conversion is at the discretion of the Superintendent.

6. Once included in its permit, the industrial user must comply with the equivalent limitations developed in this Section in lieu of the promulgated categorical standards from which the equivalent limitations were derived.

7. Many categorical pretreatment standards specify one limit for calculating maximum daily discharge limitations and a second limit for calculating maximum monthly average, or four-day average, limitations. Where such standards are being applied, the same production or flow figure shall be used in calculating both the average and the maximum equivalent limitation.

8. Any industrial user operating under a permit incorporating equivalent mass or concentration limits calculated from a production-based standard shall notify the Superintendent within two (2) business days after the user has a reasonable basis to know that the production level will significantly change within the next calendar month. Any user not notifying the Superintendent of such anticipated change will be required to meet the mass or concentration limits in its permit that were based on the original estimate of the long-term average production rate.

Section 705.404 State Pretreatment Standards.

[Ord. No. 8321, 10-20-2014]

Users must comply with State of Missouri pretreatment standards codified at 10 CSR 206.100.

Section 705.406 Local Limits.

[Ord. No. 8321, 10-20-2014]

A. The Superintendent is authorized to establish local limits pursuant to 40 CFR 403.5(c).

B. Any waters or wastes containing the following substances to such a degree that the total mass loading from all SIUs exceeds the quantity specified in the table below. The Public Works Director will develop the permit limitations for all users that meet the definition of SIU as defined by City ordinance. The Table of Total Mass Allowable is as follows:

	Total Mass Allowable (pounds) From SIUs Per Day
	Pollutant	Mass (pounds)	Sample Type
	BOD	9,595	24-hour composite
	TSS	6,685	24-hour composite
	As	0.377	24-hour composite
	Cu	2.126	24-hour composite
	Zn	13.165	24-hour composite
	Se	0.234	24-hour composite

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 Superintendent may impose mass limitations in addition to the concentration-based limitations above.

C. The Superintendent may develop best management practices (BMPs), by ordinance or in individual wastewater discharge permits, to implement local limits and the requirements of Section 705.400.

Section 705.408 City's Right of Revision.

[Ord. No. 8321, 10-20-2014]

The City reserves the right to establish, by ordinance or in individual wastewater discharge permits, more stringent standards or requirements on discharges to the POTW consistent with the purpose of this Chapter.

Section 705.410 Admission of Certain Wastes Containing Quantities of Prohibited Substances Subject to Approval — Preliminary Treatment of Certain Wastes.

[R.O. 2012 §705.410; Ord. No. A-5734 §VII, 6-18-1993; Ord. No. 8321, 10-20-2014]

A. The admission into the sanitary sewers of any polluted waters or industrial wastes containing any quantity of substance having the characteristics described in Section 705.400 shall be subject to the review and approval of the Superintendent. Where necessary, in the opinion of the Superintendent, the owner of the property or premises producing such waste shall provide, at his/her expense, such preliminary treatment as may be necessary to reduce objectionable characteristics or constituents to within the maximum limits provided for in Section 705.400 or to control the quantities or rates of discharge of such water or waters. In no case shall an industrial user be allowed to discharge wastes in violation of applicable pretreatment standards.

B. Construction drawings, specifications and other pertinent information relating to the proposed preliminary treatment facilities shall be prepared by the owner at his/her expense and shall be submitted for the approval of the Superintendent and the Water Pollution Board of the State, and no construction of such facilities shall be commenced until such approvals are obtained in writing. Construction shall be in accordance with such approved plans.

C. Where preliminary treatment facilities are provided for any waters or water, they shall be maintained continuously in satisfactory and effective operation by the owner at his/her expense.

Section 705.420 Monitoring Facilities.

[R.O. 2012 §705.420; Ord. No. A-5734 §VII, 6-18-1993; Ord. No. 8321, 10-20-2014]

The City shall require all significant industrial users to provide, at the user's own expense, monitoring facilities that are accessible by the City only, for sampling and flow measurement of the user's discharge to the POTW. The monitoring facility should normally be situated on the user's premises, but the City may, when such a location would be impractical or cause undue hardship on the user, allow the facility to be constructed in the public street or sidewalk area and located so that it will not be obstructed by landscaping or parked vehicles. The sampling facility shall be maintained at all times in a safe and proper operating condition at the expense of the user. Whether constructed on public or private property, the sampling and monitoring facilities shall be provided in accordance with the City's requirements and all applicable local construction standards and specifications. Construction shall be completed within ninety (90) days following written notification by the City.

Section 705.430 Persons Discharging Industrial Wastes, Etc., to File Report and Maintain Records.

[R.O. 2012 §705.430; CC 1979 §26-34; Ord. No. A-2692 §§14 — 15, 3-11-1969; Ord. No. 8321, 10-20-2014]

A. Every person and establishment known to be discharging industrial wastes or polluted water into the sewers or sewage works of the City, or into any sewer connected therewith, shall file a report with the Superintendent, supplying the following information:

1. Name and address.

2. Title of official making such report.

3. Location of plant.

4. The nature of the business conducted in such plant.

5. The volume of industrial waste mixture and sewage discharged by each plant.

6. The average daily number of employees employed in each plant by shifts.

7. The source of water supply of each plant and the volume of water used by each such plant daily, specified separately as to each source.

8. Such additional information as is deemed applicable to ascertain the volume, nature and composition of the industrial waste so discharged.

B. Every person discharging any industrial waste mixture into the sewers or sewage works of the City, or into any sewer connected thereto, shall keep and maintain records of the data required to be furnished by this Section in the questionnaire as defined above. Such records shall be available for inspection during regular business hours by authorized representatives or employees of the City, upon presenting written credentials of their authority, and such representatives or employees shall be permitted to make and retain copies of such records.

Section 705.440 Storage of Certain Materials in Sewered Areas, Etc., Subject to Review by Superintendent.

[R.O. 2012 §705.440; CC 1979 §26-35; Ord. No. A-2692 §17, 3-11-1969; Ord. No. 8321, 10-20-2014]

The storage of any material in sewered areas or in areas draining into a City sewer which, because of discharge or leakage from such storage, may create an explosion hazard in the sewage works or in any other way have a deleterious effect upon these works or treatment processes or constitute a hazard to human beings, animals or the receiving stream shall be subject to review by the Superintendent, who, at his/her discretion, may require reasonable safeguards to prevent discharge or leakage of large quantities of such materials into the sewers.

Section 705.450 Accidental Discharges — Development of Slug Control Plan.

[R.O. 2012 §705.450; CC 1979 §26-36; Ord. No. A-2692 §18, 3-11-1969; Ord. No. A-5734 §IV, 6-18-1993; Ord. No. 8321, 10-20-2014]

A. Each user shall provide protection from accidental discharge of prohibited materials or other substances regulated by this Article. Facilities to prevent accidental discharge of prohibited materials shall be provided and maintained at the owner's or user's own 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 existing users shall complete such a plan by August 1, 1993. No user who commences contribution to the POTW after June 18, 1993, shall be permitted to introduce pollutants into the system until accidental discharge procedures have been approved by the City. Review and approval of such plans and operating procedures shall not relieve the industrial user from the responsibility to modify the user's facility as necessary to meet the requirements of this Section.

B. Significant industrial users are required to notify the Superintendent immediately of any changes at its facility affecting the potential for a slug discharge.

C. Accidental Discharge/Slug Discharge Control Plans. The Superintendent shall evaluate whether or not each SIU needs an accidental discharge/slug discharge control plan or other action to control slug discharges. The Superintendent may require any user to develop, submit for approval, and implement such a plan or take such other action that may be necessary to control slug discharges. Alternatively, the Superintendent may develop such a plan for any user. An accidental discharge/slug discharge control plan shall address, at a minimum, the following:

1. Description of discharge practices, including non-routine batch discharges;

2. Description of stored chemicals;

3. Procedures for immediately notifying the Superintendent of any accidental or slug discharge, as required by Section 705.490(C)(1); and

4. Procedures to prevent adverse impact from any accidental or slug discharge. Such procedures include, but are not limited to, inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operation, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants, including solvents, and/or measures and equipment for emergency response.