“Best management practices (BMPs)” means schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to support the requirements in these regulations and 40 CFR 403.5(a)(1) and (b). BMPs may also include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw materials storage.

“Categorical pretreatment standard” means any regulation containing pollutant discharge limits promulgated by EPA in accordance with Sections 307(b) and (c) of the Act (33 U.S.C. Section 1317) which apply to a specific category of users and which appear in 40 CFR Chapter I, Subchapter N, Parts 405 and 471.

“Commercial user” means any customer designated as in the commercial class per SLWSDC 9.05.010. That sections states: “Commercial” means all nonresidential customers receiving water and sewer service or discharging domestic flows to the district’s sewer system without one or more dwelling units. Schools, churches, public agencies, retail stores, restaurants, office buildings, gyms/fitness facilities, hotels, motels and parks are examples of commercial class customers. Commercial class customers can be for-profit or not-for-profit customers.

“District” means the Silver Lake Water and Sewer District.

“Domestic user” means any customer who contributes, causes, or allows the contribution of domestic wastewater to the district. This generally includes but is not limited to the residential and multifamily customer classes, as defined by the district, along with commercial customers that discharge only domestic wastewater.

“Domestic wastewater” means wastewater that the district determines is of similar volume and/or chemical make-up to that of a residential dwelling unit. Domestic wastewater typically includes kitchen wastes, human wastes, and housekeeping cleaning materials in volumes and/or concentrations normally discharged from these classes of users and typically include up to 100 gallons per capita per day, 300 mg/L of BOD, and 300 mg/L of TSS.

“Fats, oils and grease” or “FOG” means those components of wastewater amenable to measurement by methods for the determination of oil and grease described in the current method of standard methods or methods identified in 40 CFR 136. The term “fats, oils and grease” shall include polar and nonpolar fats, oils, and grease and other components extracted from wastewater by these methods.

“FOG removal device” means a device designed to separate fats, oils and grease from liquid waste prior to the wastewater entering the sanitary sewer system, typically either a grease interceptor, grease trap or oil/water separator.

“Food” means any raw, cooked, or processed edible substance, ice, or ingredient used or intended for use or sale in whole or in part for consumption.

“Food processing establishment” means an establishment in which food is prepared, manufactured or packaged for consumption off site.

“Food sales establishment” means retail and wholesale grocery stores, retail seafood stores, food processing plants, bakeries, confectioneries, fruit, nuts and vegetable stores and places of business and similar establishments, mobile or permanent, engaged in the sale of food primarily for consumption off premises.

“Food service establishment” means any establishment for the preparation and/or serving of food, or other edible products, and/or are required to have a food business permit issued by the Snohomish Health District. The term “food service establishment” includes but is not limited to restaurants, coffee shops, cafeterias, breweries, wineries and distilleries, short order cafes, grocery store delis, luncheonettes, taverns, lunchrooms, places which manufacture retail sandwiches, church kitchens, soda fountains, institutional cafeterias, catering establishments, food vending vehicles, and operations connected therewith, and similar facilities by whatever name called.

“Gravity grease interceptor (GGI)” means an interceptor of at least 1,000 gallons to serve one or more fixtures and which is remotely located underground and outside of a food service establishment. It is designed to collect, contain or remove food wastes and FOG from the waste stream while allowing the balance of the liquid waste (“gray water”) to discharge to the wastewater collection system by gravity.

“Grease” means rendered animal fat, vegetable shortening, and other such oily matter used for the purposes of and resulting from preparing and/or cooking food.

“Grease interceptor (GI)” means a pretreatment device provided external to the premises designed to separate and collect fats, oils, grease, and solids and prevent these pollutants from entering the sanitary sewer. Grease interceptors may be either hydromechanical grease interceptors (HGIs) or gravity grease interceptors (GGIs).

“Grease trap” means a device designed to retain FOG from one to a maximum of four fixtures, with a maximum capacity of 50 gpm/100 pounds, and a minimum of 20 gpm/40 pounds.

“Hydromechanical grease interceptor (HGI)” means a device located inside a food service establishment designed to retain FOG from fixtures whose total capacity in gallons (gal) (L) shall not exceed two and one-half times the certified gallons per minute (gpm) (L/s) flow rate of the interceptor in accordance with the UPC. It is designed to collect, contain or remove food wastes and FOG from the waste stream while allowing the balance of the liquid waste to discharge to the wastewater collection system by gravity or mechanical means.

“Interference” means a discharge that alone, or in conjunction with a discharge or discharges from other sources, either: (a) inhibits or disrupts the wastewater collection system, its treatment processes or operations; (b) inhibits or disrupts its biosolids (sludge) processes, use or disposal; or (c) is a cause of a violation of any permit or that prevents the use or disposal of sewage sludge in compliance with any of the following statutory/regulatory provisions or permits issued thereunder: Section 405 of the Clean Water Act; the Solid Waste Disposal Act (SWDA), including Title II, commonly referred to as the Resource Conservation and Recovery Act (RCRA); any state regulations contained in any state sludge management plan prepared pursuant to Subtitle D of the SWDA; the Clean Air Act; the Toxic Substances Control Act; and the Marine Protection, Research, and Sanctuaries Act.

“Local limits” means the maximum allowed levels to be discharged by designated industrial or commercial facilities as determined by the publicly owned treatment works’ NPDES permit pursuant to 40 CFR 403.5(c)(1).

“Minimum design capability” means the design features of a GGI/HGI and its ability to or the volume required to effectively intercept and retain FOG from FOG-laden wastewaters discharged to the sanitary sewer system.

“Nondomestic user” means a user that is not a domestic user.

“Nondomestic wastewater” means wastewater that is not domestic wastewater.

“Nonpolar (petroleum or mineral origin) FOG” means fats, oils or grease (FOG) in water or waste from a petroleum or mineral source as measured using analytical procedures established in 40 CFR 136.

“Oil/water separator (OWS)” means a large capacity underground vault installed between a drain serving a nonpolar FOG discharger and the connecting sewer pipe. These vaults are designed with baffles or coalescing plates to trap sediments and retain floating oils. The large capacity of the vault slows down the wastewater, allowing oil to float to the surface and solid material to settle out. Any customer that is a potential discharger of petroleum-based and/or nonpolar FOG is required to have an OWS. Businesses and facilities that require oil/water separators include, but are not limited to, car washes, quick-lube stations, loading docks/trash compactors, auto detail shops, parking garages, elevator sumps, gas stations, fuel pumps, automotive and equipment repair, service shops and any businesses using steam or pressure washers.

“Pass through” means a discharge which exits the POTW into waters of the United States in quantities or concentrations which, alone or in conjunction with a discharge or discharges from other sources, is a cause of a violation of any requirement of an NPDES permit(s), including an increase in the magnitude or duration of a violation.

“Polar (animal and vegetable origin) FOG” means fats, oils or grease (FOG) in water or waste from an animal or vegetable source as measured using analytical procedures established in 40 CFR 136.

“Pollutant” means a contaminant, or other cause of alteration of the physical, chemical, or biological properties, of any waters of the state, including change in temperature, taste, color, turbidity, or odor of the waters, or such discharge of any liquid, gaseous, solid, radioactive, or other substance into any waters of the state as will or is likely to create a nuisance or render such waters harmful, detrimental, or injurious to the public health, safety, or welfare, or to domestic, commercial, industrial, agricultural, recreational, or other legitimate beneficial uses, or to livestock, wild animals, birds, fish, or other aquatic life.

“POTW” means a publicly owned treatment works as defined by Section 212 of the Act (33 U.S.C. Section 1292), which is owned by the district or other municipality or sewer district (e.g., city of Everett, AWWD and King County) to which wastewater from the district is conveyed. This definition includes any devices or systems used in the collection, conveyance, storage, treatment, recycling, and reclamation of sewage or industrial wastes of a liquid nature and any conveyances which convey wastewater to a treatment plant.

“Rendering/disposal company” means a business that possesses the necessary license and certification for the collection, acceptance and disposal or reuse of FOG.

“Significant industrial user (SIU)” is a user that meets any of the following:

“Standard methods” means the current version of Standard Methods for the Examination of Water and Wastewater (APHA, WEF, AWWA).

“User” means any person, business or entity that contributes, causes or permits the contribution of wastewater into the district’s sanitary sewer system.

“Wastewater” means any combination of liquid and water-carried sewage and/or commercial/industrial wastes and from any customer including residential dwellings, commercial buildings, industrial and manufacturing facilities, and institutions, whether treated or untreated, which are contributed to the POTW. [Res. 830 § 1 (Exh. 1), 2022.]