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Article 6
Sec 07.06.006
Federal and State Standards

A. The national categorical pretreatment standards found in 40 CFR Chapter I, Subchapter N, as may be amended from time to time, and any State pretreatment standards promulgated by the Missouri Clean Water Commission in accordance with 644.026(16), RSMo, which apply to industrial users are hereby incorporated. Upon promulgation of the Federal Categorical Pretreatment Standards for a particular industrial subcategory, the Federal standard, if more stringent than limitations imposed under this Article, is applicable to the user's discharge.

B. State requirements and limitations on discharges shall apply in any case where they are more stringent than Federal requirements and limitations or those in this Article.

C. The City reserves the right to establish more stringent limitations or requirements on discharges to the POTW if deemed necessary.

D. Industrial users shall comply with applicable pretreatment standards and requirements as set forth in 40 CFR Part 403 and in 10 CSR 20-6.100, as may be amended from time to time.

E. The Director may deny or condition new or increased contributions of pollutants, or changes in the nature of pollutants, to the POTW by industrial users where such contributions do not meet applicable pretreatment standards and requirements or where such contributions would cause the POTW to violate its NPDES permit.

F. Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the Director may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c) and 10 CSR 20-6.100(5)(D), as may be amended from time to time.

G. Where wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, Director may impose fixed alternative discharge limits using the combined wastestream formula as set forth in 40 CFR 403.6(e) and 10 CSR 20-6.100(5)(F), as may be amended from time to time.

H. An industrial user may obtain a variance from a categorical pretreatment standard if the industrial user can prove, pursuant to the procedural and substantive provisions in 40 CFR 403.13 and 10 CSR 20-6.100(11), as may be amended from time to time, that factors relating to its discharge are fundamentally different from the factors considered by EPA when developing the categorical pretreatment standard.

I. An industrial user may obtain a net/gross adjustment to a categorical standard in accordance with 40 CFR 403.15 and 10 CSR 20-6.100(13), as may be amended from time to time.

Sec 7.06.007
Specific Pollutant Limitations

A. Except as otherwise provided by a compliance schedule, permit, or other written authorization from the Director, no person shall contribute or cause to be contributed, directly or indirectly, to the POTW, any discharge containing pollutants in excess of instantaneous maximum allowable discharge limits including, but not limited to, the following:

0.10 mg/l of total Arsenic 0.24 mg/l of total Silver
7.7 mg/l of total Barium 5.0 mg/l of total Zinc
0.26 mg/l of total Beryllium 0.10 mg/l of total Cyanide
0.10 mg/l of total Cadmium 5.0 mg/l of Phenols
0.20 mg/l of hexavalent Chromium 50 mg/l of Ammonia
2.0 mg/l of total Chromium 5.0 mg/l of Sulfides
1.0 mg/l of total Copper 300 mg/l of total Halides
25 mg/l of total Iron 5.0 mg/l of free Chlorine
0.10 mg/l of total Lead 25 mg/l of total Recoverable Petroleum Hydrocarbons
0.0016 mg/l of total Mercury 100 mg/l of oil and grease
1.0 mg/l of total Nickel 0.0048 mg/l of total Selenium

Concentrations apply at the point where the wastewater is discharged to the POTW unless otherwise specified by permit. At the Director's discretion, mass limitations may be imposed in addition to or in place of the concentration based limitations above.

B. The Director may develop specific limits on a case-by-case basis for any temporary discharge of wastewater's resulting from the cleanup or closure of a hazardous waste site under the authority of the Missouri Hazardous Waste Management Law, the Resource Conservation and Recovery Act (RCRA), the Comprehensive Environmental Response Compensation and Liability Act (CERCLA), or the Toxic Substances Control Act (TSCA), or for other temporary discharges.

C. The City reserves the right to establish in wastewater discharge permits, or in other documents authorizing discharge, more stringent standards or requirements on discharges to the POTW if deemed necessary.

D. Any non-domestic user that cannot meet the Specific Pollutant Limitations listed in Section 7.06.007, paragraph "A", or other requirements of this Article, may submit to the Water Pollution Control Director a written request for a waiver of Specific Pollutant Limitations or of other requirements. For significant industrial users or other nondomestic users subject to wastewater discharge permit requirements pursuant to Section 7.06.014, the Director may grant a waiver of Specific Pollutant Limitations or of other requirements via a wastewater discharge permit or modification to an existing wastewater discharge permit. For nondomestic users not subject to wastewater discharge permit requirements, the Director may grant a waiver of Specific Pollutant Limitations or of other requirements of this Article via a Special Use Authorization. The Director will evaluate the information provided by the nondomestic user and will consider all relevant factors, including but not limited to the following: Volume of wastewater, requested pollutant concentration(s), destination of wastewater, and current pollutant capacity. The Director may require the nondomestic user to furnish additional information. The Director may deny any application for a waiver. The filing of a request for a waiver of Specific Pollutant Limitations or of other requirements does not stay or otherwise change the nondomestic user's legal obligations pending issuance or denial of the waiver. Issuance of a waiver via a wastewater discharge permit or permit modification pursuant to Section 7.06.014 or via a Special Use Authorization shall not be construed as a waiver of the POTW's Local Limits, but as a change in the allowable concentration of discharge to the POTW for a particular user via a special agreement. Concentration of discharge to the POTW allowable by wastewater discharge permit or Special Use Authorization is limited to mass loadings which will not cause interference or pass through. The Director will take into consideration the Local Limits of neighboring jurisdictions when issuing a Special Use Authorization to a nondomestic user to discharge to a sewer tributary to another jurisdiction. The following conditions will apply to all waivers granted via wastewater discharge permits, permit modifications, or Special Use Authorizations:

1. The duration of the waiver will be specified and shall in no event exceed five (5) years, and application for renewal must be made at least sixty (60) days before expiration.
2. Any violation of permit or Special Use Authorization conditions may result in immediate revocation of the waiver or in other enforcement action pursuant to Section 7.06.013.
3. The permit or Special Use Authorization is not transferable without approval from the Director.
4. Waiver of applicable Federal categorical pretreatment standards is prohibited.

E. Except where expressly authorized to do so by an applicable Federal Categorical Pretreatment Standard or by any other pollutant-specific limitation developed by the State or City, no nondomestic user shall ever increase the use of process water or, in any other way, attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with a Federal Categorical Pretreatment Standard or with any other pollutant-specific limitation developed by the State or City.

Sec 7.06.008
Accidental and Other Slug Discharges

A. Each nondomestic user shall provide protection from accidental discharge of prohibited materials or other substances regulated by this Article. The Director may require any nondomestic user to submit detailed plans to the Director for review showing facilities and operating procedures to provide protection from accidental discharge of prohibited materials. These plans shall be modified to meet the Director's comments within the time frame established by the Director. If required, facilities shall be constructed according to plans approved by the Director. Facilities to prevent accidental discharge of prohibited materials shall be provided and maintained at the user's own cost and expense.

B. The Director will evaluate, at least every two years, whether each significant industrial user needs a slug control plan to control any discharges of a non-routine, episodic nature, including non-customary batch discharges as well as accidental discharges. The Director may require nondomestic users which are not significant industrial users to implement an approved slug control plan. The slug control plan, if required, shall be submitted to the Director for review. The slug control plan shall be modified to meet the Director's comments within the time frame established by the Director. Alternatively, the Director may develop such a plan for any nondomestic user. The nondomestic user shall comply with the slug control plan upon its approval.

If required, the slug control plan shall include, at a minimum, the following:

1. Description of discharge practices, including non-routine batch discharges; and
2. Description of stored chemicals; and
3. Procedures for immediately notifying the POTW of any accidental or other slug discharge, including any discharge which would violate any of the prohibited discharges in Section 7.06.005 of this Article, with procedures for follow-up written notification within five (5) days; and
4. If necessary, 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 operations, control of plant site runoff, worker training, measures for containing toxic organic pollutants (including solvents) and/or measures and equipment for emergency response.

The Director may also require the slug control plan to include any of the following:

1. Description of the location of stored chemicals, which may include a site plan; and,
2. Spill prevention through proper initial selection and construction of equipment; equipment operation, maintenance, and inspection procedures; personnel training and supervision; and security measures to prevent vandalism; and
3. Spill containment through provision of secondary containment devices or diversionary structures; and
4. Spill clean-up manpower and materials; and
5. Measures for containing spills of raw materials, products and intermediate product and wastes; and|
6. Any other measures deemed necessary by the Director to adequately control slug discharges.

C. ln the case of a discharge that could cause problems to the POTW, including an accidental or other slug discharge, it is the responsibility of the user to immediately telephone and notify the POTW of the incident. The notification shall include location of discharge, type of waste, concentration, volume, and corrective actions.

D. Within five (5) days following an accidental or other slug discharge the user shall submit to the Water Pollution Control Director, a detailed written report describing the cause of the discharge and the measures to be taken by the user to prevent similar future occurrences. Such notification shall not relieve the user of any expense, loss, damage, or other liability which may be incurred as a result of damage to the POTW, fish kills, or any other damage to person or property; nor shall such notification relieve the user of any fines, civil penalties, or other liability which may be imposed by this Article or other applicable law.

E. All nondomestic users shall permanently post on a bulletin board or other prominent place, a notice advising employees whom to call in the event of a dangerous discharge. Employers shall insure that all employees who may cause or suffer such a dangerous discharge to occur are advised of the emergency notification procedure.

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