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(A) Grease, oil and sand interceptors (traps) or any other method approved by the city shall be provided at the expense of the property owner when liquid wastes contain grease in excessive amounts, or other harmful ingredients. An interceptor shall be required for every food service establishment (restaurant and fast food outlets), automotive repair shop or garage, car wash, or any other type of establishment or use as determined necessary by the WRRF Superintendent. An interceptor shall not be required for single-family and multi-family dwelling units. All interceptors shall be of a type and capacity approved by the city and shall be located as to be readily and easily accessible for cleaning and inspection. Grease, oil and sand interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, watertight and equipped with easily removable covers which when bolted into place shall be gastight and watertight.
(B) Where installed, all grease, oil and sand interceptors (traps) or any other method approved by the city shall be maintained by the owner, at his or her expense, in continuously efficient operation at all times.
(Ord. 622, passed 3-4-85; Am. Ord. 1074, passed 9-27-21) Penalty, see § 51.999
(A) Right of review by city. Admission into the public sewers of wastewaters containing any prohibited discharges in § 51.062 or having an average daily flow rate of 10,000 gallons or more shall be subject to review by the city. All proposed discharges to the sanitary sewers shall be reviewed prior to connection. The discharge of an existing user shall be subject to review if a change in the contribution is anticipated or at the request of the city to demonstrate continued compliance with ordinance requirements. In support of this review, existing or potential users of the sewers shall provide all information necessary to complete the review. This information shall include, but is not limited to, the following:
(1) File a written statement setting forth the nature of the enterprise, the source and amount of water used, the amount of water to be discharged with its present or expected bacterial, physical, chemical, radioactive, or other pertinent characteristics of the wastes.
(2) Provide a report on raw materials entering the process or support system, intermediate materials, final product, and waste by-products as those factors may affect waste control.
(3) Provide a plan map of the building, works, or complex, with each outfall to the surface waters, sanitary sewer, storm sewers, natural watercourse, or groundwaters noted, described, and the waste stream identified.
(4) Records and reports on the final disposal of specific liquids, solids, sludges, oils, solvents, radioactive materials, and other wastes.
(5) In the case of existing discharges, sampling and test reports as may be required by the city.
(B) Right to exclude or require pretreatment. On direction of the city, an entity may be required to remove, exclude, or require pretreatment of any waste in whole or in part for any reasons deemed to be in the city's interest. Where preliminary treatment facilities are provided for any waters or wastes, they shall be maintained in satisfactory and effective operation at no expense to the city and shall be designed and operated to assure that wastewaters discharged meet the characteristics set forth in § 51.062. A wastewater contribution permit may be required for any discharge as provided in §§ 51.080 through 51.088.
(Ord. 622, passed 3-4-85; Am. Ord. 1074, passed 9-27-21)
(A) No provision of this chapter shall be construed as preventing any special agreement or arrangement between the city and any user whereby sewage or wastes of unusual strength or character may be accepted by the sewage system for treatment, subject to the payment by such user of such additional charges as may be reasonable. However, federal and state prohibited discharge standards can never be waived. Where authorized by the WRRF Superintendent, special alternative limit agreements shall be made such that the allocation to all industrial users in the city service area does not exceed the calculated maximum allowable industrial loading (MAIL) for any parameter and such that the allocation to all sewer users does not exceed the calculated maximum allowable headworks loading (MAHL) for any parameter summarized in this section.
(B) A non-domestic user may, at the time of application for a wastewater discharge permit, or by a special alternative limit application, request that permitted discharge limits be increased from the standard local limits listed in § 51.062. Such special alternative limits shall be expressed as total daily pounds of pollutant discharged. Special alternative limits (SALs) shall be developed in accordance with the procedure for special alternative limits allocation as outlined in the Industrial Pretreatment Program manual for the city and approved by EGLE. The city's rules and regulations shall be available for inspection at 1301 N. Franklin St., Mt. Pleasant, MI 48858.
(C) The city reserves the right to reduce or deny special alternative limits if total pollutant discharges near or reach the MAHLs set forth in the table in this section. The city reserves the right to amend the MAHLs set forth in this section at its discretion. The special alternative limit must not result in the POTW (including the collection system) receiving pollutants in excess of its ability to convey or treat.
(D) A user which requests a special alternative limit through the permit application process must sign a written acknowledgment whereby the user consents to comply with all terms and conditions which may be imposed by the city. Such acknowledgment shall be in a form provided by the city, and must be executed by an authorized representative before any special alternative limit is effective.
(E) In addition, the city reserves the right to institute a review of any previously permitted special alternative limits at any time, pursuant to which the city, in its discretion, upon notice and the opportunity for hearing, may reduce or eliminate a user's previously permitted to approved special alternative limit.
(F) Any discharge in excess of the amount permitted by the special alternative limit is prohibited and is therefore a violation of this section and the user's wastewater discharge permit.
(G) The EGLE approved (2020) MAHL and MAILs for parameters that may be considered for SALs are as follows:
Parameter | MAHL (lb/day) | MAIL (lb/day) |
BOD5 | 5,764 | 645 |
TSS | 5,725 | 924 |
Phosphorus | 114 | 13 |
Ammonia (as N) | 918 | 54 |
(H) MAHL and MAIL values will be re-evaluated periodically as required by federal and state IPP regulations.
(Ord. 622, passed 3-4-85; Am. Ord. 1074, passed 9-27-21)
(A) When required by the city to demonstrate compliance with this chapter, the owner of any property serviced by a building sewer shall install a suitable control manhole together with sampling equipment, flow meters, and other appurtenances as necessary in the building sewer to facilitate monitoring the control manhole shall be constructed in accordance with plans approved by the Superintendent. The manhole shall be installed by the owner at his or her expense, and shall be maintained by him/her so as to be safe and accessible at all times. 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 from the point at which the building sewer is connected.
(B) All measurements, tests and analyses of the characteristic of waters and wastes to which reference is made in this chapter shall be determined in accordance with 40 CFR Part 136, as amended, or as required by EGLE. All measurements, tests, and analyses shall be determined as the control manhole and upon suitable samples taken at said manhole. It shall be the responsibility of the industrial customer to provide flow measuring sampling equipment for each control manhole.
(Ord. 622, passed 3-4-85; Am. Ord. 1074, passed 9-27-21) Penalty, see § 51.999
PRETREATMENT PROVISIONS
(A) Introduction. This subchapter sets forth uniform requirements for direct and indirect contributors into the wastewater collection and treatment system and enables the city to comply with all applicable state and federal pretreatment regulations (40 CFR Part 403).
(B) Federal standards supersede. Any existing or new federal categorical pretreatment standards shall immediately supersede the limitations imposed under this chapter if more stringent. In such a case, the Superintendent shall notify all affected users of the applicable reporting requirements under 40 CFR 403.12.
(C) Modification of federal pretreatment standards.
(1) Where the city's wastewater treatment system achieves consistent removal of pollutants limited by federal pretreatment standards, the city may apply to the approval authority for modification of specific limits in the federal pretreatment standards. CONSISTENT REMOVAL shall mean reduction in the amount of a pollutant or alteration of the nature of the pollutant by the wastewater treatment system to a less toxic or harmless state in the effluent.
(2) The city reserves the right to establish as described in § 51.062(P), more stringent limitations or requirements on discharges to the wastewater disposal system if deemed necessary.
(Ord. 622, passed 3-4-85; Am. Ord. 704, passed 3-12-91; Am. Ord. 727, passed 4-29-91; Am. Ord. 1074, passed 9-27-21)
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