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Article 6
Sec 7.06.009
Extra Strength Wastes

A. Any wastewater having (a) a COD greater than four hundred (400) mg/l, or (b) a BOD greater than two hundred twenty-five (225) mg/l, or (c) more than two hundred fifty (250) mg/l of suspended solids, or (d) an average daily flow greater than twenty-five thousand (25,000) gallons per day, shall be subject to the review of the Water Pollution Control Director. Where necessary in the opinion of the Water Pollution Control Director, the nondomestic user shall provide, at his/her expense, such pretreatment as may be necessary to reduce the oxygen demand, reduce the suspended solids, or control the quantities and rates of discharge of such wastewater.

B. Any wastewater accepted by the City having a COD greater than 400 mg/l, or a BOD greater than 225 mg/l, or more than 250 mg/l suspended solids, shall be subject to a surcharge to cover the extra costs of treatment as established in Section 7.07.011.

C. Nothing contained in this Article shall be construed as preventing the Director from accepting an industrial waste, holding tank waste or other waste of unusual strength or character for treatment, provided such waste does not violate applicable Federal categorical pretreatment standards.

Sec 7.06.010.
Pretreatment of Nondomestic Waste

A. Nondomestic users shall provide necessary wastewater pretreatment as required to comply with this Article and achieve compliance with all applicable Federal, State, and local pretreatment standards and requirements within the time limitations as specified by the applicable Federal, State, or local regulations. Any facilities required to pretreat wastewater to a level acceptable to the POTW shall be provided, operated, and maintained continuously in satisfactory and effective operation by the user at his/her expense. Detailed plans showin8 the pretreatment facilities and operating procedures shall be approved by the Water Pollution Control Director before construction of the facility. The review of such plans and operating procedures will in no way relieve the user from the responsibility of modifying the facility as necessary to produce an effluent acceptable to the POTW under the provisions of this Article. Any subsequent significant changes in the pretreatment facilities or method of operation shall be reported to and be acceptable to the Director prior to the user's initiation of the changes, in accordance with Section 7.06.015, paragraph "G". The Director may require a nondomestic user to conduct a compatibility study prior to the introduction of a new waste to the POTW to determine whether such waste is acceptable to the POTW.

B. The City shall annually publish in the City's largest newspaper, a list of the significant industrial users which, at any time during the previous twelve (12) months, were in significant noncompliance with applicable pretreatment standards or requirements. If deemed appropriate by the Director, the City may also publish any other nondomestic users identified to be in significant violation. For purposes of this provision, a significant violation is a violation which remains uncorrected 45 days after the user receives written notification of noncompliance; which is a part of a pattern of noncompliance over a 12 month period; which involves a failure to accurately report noncompliance; or which resulted in the POTW exercising its emergency authority. The term significant noncompliance shall mean:

1. Chronic violations of pretreatment standards, defined herein as those in which sixty-six percent (66%) or more of wastewater measurements taken during a six-month period exceed the daily maximum limit or average limit for the same pollutant parameter by any amount; or,
2. Technical Review Criteria (TRC) violations, defined here as those in which thirty-three percent (33%) or more of wastewater measurements taken for each pollutant parameter during a six-month period equals or exceeds the product of the daily maximum limit or the average limit multiplied by the applicable criteria. The criteria for fats, oils and grease is 1.4. For all other pollutants except pH, the criteria is 1.2; or,
3. Any other discharge violation that the Director believes has caused, alone or in combination with other discharges, interference or pass through, including endangering the health or welfare of City personnel or the general public; or,
4. Any discharge of pollutants that has caused imminent endangerment to the public or to the environment, or has resulted in the City's exercise of emergency authority to halt or prevent such a discharge; or,
5. Failure to meet, within ninety (90) days of the scheduled date, a compliance schedule milestone contained in a wastewater discharge permit or an enforcement order for starting construction, completing construction, or attaining final compliance; or,
6. Failure to provide thirty (30) days after the due date, any required reports, including baseline monitoring reports, 90-day compliance reports, periodic self-monitoring reports, and reports on compliance with compliance schedules; or,
7. Failure to accurately report noncompliance; or,
8. Any other violation(s) which the Director determines will adversely affect the operation or implementation of the local pretreatment program.

C. The Water Pollution Control Director may impose mass limitations on nondomestic users where the imposition of mass limitations are appropriate. In such cases, the reports required by this Article shall indicate the mass of pollutants regulated by Pretreatment Standards in the effluent of the user.

D. Every significant industrial user, shall complete a Wastewater Characteristics Survey periodically when requested by the Water Pollution Control Director. The form will be supplied by the City and shall be completed and returned by the user. The Director may also require any nondomestic user which is not a significant industrial user to periodically complete a Wastewater Characteristics Survey. Failure to complete the required Survey is a violation of this Article and may be considered reasonable grounds for terminating service to the significant industrial user or other nondomestic user. When required by the Director, new nondomestic users shall complete a Wastewater Characteristics Survey as part of the application for an occupational license. The form will be supplied by the City and must be returned before an occupational license can be issued. The user will be required to supply any and all information deemed by the Water Pollution Control Department to be necessary to evaluate compliance with the Federal Categorical Pretreatment Standards or this Article including, but not limited to: Name; address, location; Standard Industrial Classification (SIC) code, wastewater characteristics and constituents, time and duration of contribution, site plans with details to show all building sewers and connections, modifications necessary to meet Pretreatment Standards, types and amounts of raw materials, number of employees and hours of operation.

E. Grease, oil and sand interceptors shall be provided when, in the opinion of the Water Pollution Control Director, they are necessary for proper handling of liquid wastes containing oil and grease in excessive amounts as specified in Section 7.06.005, paragraph "A.4", and Section 7.06.007, paragraph "A", or any flammable waste, 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 Water Pollution Control Director, and shall be located as to be readily and easily accessible for cleaning and inspection.

In the maintaining of these interceptors, the user shall be responsible for the proper removal and disposal by appropriate means of the captured material and shall maintain records in accordance with Section 7.06.015, paragraphs "L" and "N", of the dates, and means of disposal which are subject to review by the Water Pollution Control Director. Any removal and hauling of the collected materials not performed by the user's personnel must be performed by appropriately licensed waste disposal firms.

F. Whenever deemed necessary, the Director may require industrial users to restrict their discharge during peak flow periods, designate that certain wastewater be discharged only into specific sewers, relocate and/or consolidate points of discharge, separate domestic wastes from industrial wastestreams, and such other conditions as may be necessary to protect the POTW and determine the industrial user's compliance with the requirements of this Article.

G. Whenever deemed necessary, the Director may require each person discharging into the POTW greater than 25,000 gallons per day or greater than five percent (5%) of the average daily flow in the POTW, whichever is lesser, to install and maintain, on the discharger's property and at his expense, a suitable storage and flow control facility approved by the Director to insure equalization of flow. The Director may require the facility to be equipped with alarms and a rate of discharge controller, the regulation of which may be directed by the Director. A wastewater discharge permit may be issued solely for flow equalization.

H. Nondomestic users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter.

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