Customers who are required to pass water through a grease trap or other interceptor will provide a minimum 12-minute retention time at theoretical peak flow rate between the influent and effluent baffles.
The grease interceptor must have a minimum capacity of 1000 gallons unless logistics of the facility will not allow it. Any deviation of this requirement (1000 gallon trap) must be approved by the Director on a case by case basis.
The grease interceptor shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperatures, and shall be of substantial construction, watertight and equipped with easily removable covers over the influent and effluent tees of the interceptor. All joints shall be properly sealed to prevent infiltration or leakage by using mastic, butyl rubber, or other pliable sealant that is waterproof and corrosion resistant.
The interceptor shall be equipped with an influent and effluent tee. The effluent tee shall be located and sized such that monitoring for oil and grease can be accomplished without transferring the sample.
The interceptor shall contain a baffle system, which adequately diverts and slows the flow to avoid short-circuiting. Interceptors located in roadways or parking lots should be traffic rated.