1. Facilities required to pretreat waste or wastewater before discharge to the POTW must submit complete sets of plans and specifications for the pretreatment system as specified by the director. All such plans shall describe the proposed pretreatment method, process, or technology, including products, chemicals, agents, or devices used for pretreatment as well as operating procedures.

2. All plans and specifications shall be prepared in accordance with Chapter 18.43 RCW and in accordance with the requirements for approval of industrial wastewater facilities contained in Chapter 173-240 WAC.

3. No construction or installation shall begin until the director has approved in writing the plans and specifications and O&M manual for the proposed pretreatment system. Approval is related to the hydraulic capacity and wastewater system compatibility and does not constitute any assurances that the treatment system will perform effectively to reduce pollutants. 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 acceptable discharge to the city under the provisions of this chapter.

1. During the construction of all pretreatment facilities, including private sewers that directly or indirectly connect to the public system, the director shall have access thereto for inspection purposes and, if considered advisable by the director, may require an inspector on the job continuously. At no time shall sewers be backfilled or covered until the department has been notified and has given proper inspection and approval. If the work is not approved, it shall be repaired or removed and reconstructed, whichever is directed by the director. All costs of inspection and testing shall be borne by the owner/user.

2. A person may not discharge wastewater to the POTW from or through a pretreatment facility until the facility’s construction, installation, and connection to the POTW have been inspected and approved by the director.

3. The director may require a pretreatment facility, process, device, agent or product to be tested prior to use or commencement of discharge to the POTW.

4. Within 90 days after the completion of the wastewater pretreatment facility, the discharger shall furnish as-built drawings and its operations and maintenance procedures to the director. Any subsequent significant changes in the pretreatment facility or method of operation shall be reported to and approved by the director prior to the initiation of the changes.

1. GI Design. All industrial waste streams containing FOG within restaurants, commercial kitchens, or other FOG-generating facilities shall be directed into an appropriately sized GI. No sanitary waste shall be conveyed to the GI. GIs shall be designed, sized, constructed, and installed in accordance with city standards and the Uniform Plumbing Code (UPC). A sampling port/box that will accommodate the collection of valid oil and grease samples shall be included on all GI installations.

2. GI Installation. GI shall be installed such that they are easily accessible for inspection, cleaning, and the removal of FOG and solid material. An accessible GI shall meet the following minimum criteria: the edge of the GI shall be flush with any edge of an overhead obstruction; and the overhead clearance shall be at least equal to the overall depth of the GI. GI access covers should be located such that the influent and effluent sanitary “T” and compartment walls are accessible at all times for proper cleaning and inspection.

3. Fats, Oil, and Grease Sources. All fixtures, equipment, and drain lines located in a facility’s food preparation and cleanup areas, which are sources of FOG, shall be connected to a GI. Dishwashers and food grinders may only be directed to GIs per director or manufacturer instructions. Dishwashers or other fixtures discharging emulsifying agents, such as detergents, should be located such that their potential to adversely impact the GI operation is minimized. The following types of equipment or fixtures have been identified as potential sources of FOG and shall be connected to a GI per director’s or manufacturer’s instructions: pre-rinse and/or pre-wash sinks or sinks in dishwashing areas; two- or three-compartment sinks; wok stoves; self-cleaning stove ventilation/exhaust hood; kitchen floor drains; floor drains; floor sinks; mop sinks; food prep sinks; and hand sinks. The city requires that all drain lines have permanently fixed screens with maximum one-quarter-inch openings to prevent the pass-through of larger solids into the GI and/or wastewater collection system. Commercial food service discharges using food grinders or garbage disposals are required to install/maintain a solids interceptor prior to the GI. [Ord. 2020-07-016 § 1; Ord. 2019-11-032 § 1].