A. Grease, oil and sand traps shall be provided when, in the opinion of the public works director, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand and other harmful ingredients; except that such traps shall not be required for private living quarters or dwelling units. All traps shall be of a type and capacity approved by the public works director, and shall be located as to be readily and easily accessible for cleaning and inspection. All traps are large devices and shall be exterior, in ground installations; provided, that as to dischargers at existing locations as of the effective date on this chapter, where it is physically impossible to locate an trap at an exterior, in ground location, the public works director may grant an exception allowing the trap to be placed in an approved interior location.

B. Grease, oil, and sand traps shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction watertight and equipped with easily removable covers which when bolted in place shall be gastight and watertight.

C. Where installed, all grease, oil, and sand traps shall be maintained by the owner, at his expense, in continuously efficient operation at all times. It is specifically prohibited to maintain traps by bacteriological, chemical, or enzymatic addition or treatment.

D. Wastewater discharge permits may be issued to users of grease, oil, and sand traps. Permits shall establish minimum requirements for the design, operation, maintenance, and performance of the equipment. Permits may include other information as described in this chapter.

E. The discharge of waste to a grease, oil, and sand trap is subject to all sections of this chapter.

F. Purchase and installation of the trap shall be at the user’s expense. No exceptions shall be made to the requirements of this section due to expense, size of the installation, or difficulties in locating the trap within the site boundary. (Ord. 576, 2008).