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A. Whenever deemed necessary, the director may require users and specifically users with a history of significant noncompliance to comply with such conditions as may be necessary to protect the POTW and determine the user’s compliance with the requirements of this chapter. Such measures may include restricting a discharge during peak flow periods; designating that certain wastewater be discharged only into specific sewers; requiring relocation and/or consolidation of discharge points; and/or separating sewage waste streams from industrial waste streams.

B. Any new FSE or existing FSE when plumbing modifications take place that require a plumbing permit (except those located in the downtown area within the city as set forth in Exhibit A1 to Ordinance 011/2015 and incorporated herein by this reference), which prepares food and/or washes dishes, utensils and other equipment used to prepare food on site, shall install and utilize a city-approved interceptor. All sinks, garbage disposals, dishwashers, floor drains and cooking equipment with drain connections shall be plumbed to an appropriate interceptor approved by the public works director. Food service establishments with dishwashers and/or garbage grinders shall be required to install a gravity grease interceptor (GGI). Food service establishments without dishwashers and/or garbage grinders shall be required to install a hydromechanical grease interceptor (HGI) or other approved interceptor approved by the public works director. All interceptors shall be sized and installed in accordance with the city’s currently adopted plumbing code.

C. Grease, oil, and sand interceptors or traps shall be required when they are necessary for the proper handling of wastewater containing grease and oil in excess of the limits in MMC 13.10.050(B)(3) or excessive amounts of sand or other settleable solids. Such interceptors shall not be required for domestic users. All interceptors shall be of type and capacity approved by the director and shall be located to be easily accessible for cleaning and inspection. Each user shall maintain, inspect, and clean required interceptors or traps on a schedule that ensures they capture the intended pollutants and prevents their reintroduction into the storm or sanitary sewer systems. Users shall bear all expenses related to installation, maintenance, and repair of interceptors and the proper disposal of removed materials.

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

E. The director may require a user discharging more than ten thousand gallons per day or ten percent of the average daily flow in the POTW, whichever is less, to install and maintain, on its property and at its expense, a suitable storage and flow-control facility to ensure equalization of flow over a twenty-four-hour period. The facility shall have a capacity for at least fifty percent of the daily wastewater discharge volume and shall be equipped with alarms and a rate of discharge controller. The director shall direct the control of discharges. The city may require the user to obtain a wastewater discharge permit solely for flow equalization or to develop a slug discharge control plan (MMC 13.10.150). (Ord. 005/2023 § 2 (Exh. B); Ord. 016/2021 § 2; Ord. 011/2015 § 1; Ord. 004/2014 § 2; Ord. 011/2004)

1 Code reviser’s note: Ord. 011/2015, Exhibit A, reads as follows: “Area included within the “Downtown Area”. The area bordered by the following: Madison Street on the west, McDougall Street on the south, Al Borlin Park on the east and US 2 on the north. Where the boundaries are indicated by a street, the boundary shall be the centerline of that street. Where the boundaries are irregular, the study area boundary shown on the Downtown Master Plan shall control.”