13.30.060 Discharge criteria.
In addition to the prohibitions outlined in GHMC 13.28.170, the following prohibitions shall apply:
A. Where oil and grease are a byproduct of food preparation and/or cleanup, reasonable efforts shall be made to separate waste oil and grease into a separate container for proper disposal. Except as contained in byproducts of food preparation and/or cleanup, waste oil and grease shall not be discharged to any drains or grease interceptors (GGIs/HGIs). Such waste shall be placed in a container designed to hold such waste and either utilized by industry or disposed of at suitable locations.
B. None of the following agents shall be placed directly into an interceptor, or into any drain that leads to the interceptor:
1. Emulsifiers, de-emulsifiers, surface active agents, enzymes, degreasers, or any type of product that will liquefy grease interceptor wastes;
2. Any substance that may cause excessive foaming in the POTW; or
3. Any substance capable of passing the solid or semi-solid contents of the interceptor to the POTW.
C. The influent to interceptors (GGIs/HGIs) shall not exceed 140 degrees Fahrenheit (140º F). The temperature at the influent inspection port shall be considered equivalent to the temperature of the influent.
D. Toilets, urinals, and other similar fixtures shall not discharge through a grease interceptor.
E. All waste shall only enter the grease interceptor through the inlet pipe.
F. Where food waste grinders are installed, the waste from those units shall discharge directly into the building drainage system without passing through a grease interceptor.
G. Discharge of oil and grease in excess of 100 milligrams per liter (mg/l) concentrations are not allowed downstream of GGI/HGI.
H. The Uniform Plumbing Code Section 1014.1.3 additionally prohibits the discharge from “dishwashers” into any HGI unless specifically required or permitted by the authority having jurisdiction.
I. Cleaning of any equipment used in a food service establishment shall be performed using best management practices (BMPs). At no time shall waste from any equipment maintenance be allowed to enter into the storm drain system. If equipment is cleaned utilizing food establishment drains, flow must not exceed rated design flow of the interceptor. No chemical shall be allowed that will emulsify or alter the grease to allow it to pass through the interceptor. If hot water is used it shall not exceed 140 degrees at the inlet of the interceptor. (Ord. 1185 § 4, 2010; Ord. 1107 § 7, 2007; Ord. 1087 § 6, 2007).