Ord 1986-134 - Laserfiche WebLink

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SAND AND GREASE Grease, oil and sand interceptors shall be provided when wastes containing these pollutants are discharged into the sanitary sewer system of the City. Interceptors shall not be required on private dwellings. Grease, oil and sand interceptors shall be sized and designed according to the criteria contained in this section. Design Criteria: Grease, oil and sand interceptors shall be sized in accordance with the Uniform Plumbing Code. The interceptor shall have two compartments with the primary having a seven (7) minute detention time and the secondary having a five (5) minute detention time. The interceptor shall have access into each compartment for the purpose of cleaning. The interceptor shall be constructed of impervious material acceptable to the City of San Marcos. The interceptor shall be capable of withstanding the traffic load where installed. All piping entering, within, and exiting the interceptor shall be installed according to the attached diagram. Manufactured interceptors acceptable to the Director and properly sized may be used in lieu of on site construction. Where possible, the interceptor shall be installed outside the building. Sizing Criteria: Grease, oil and sand interceptors shall be sized according following criteria: to the TRAP AND TRAP KIND OF FIXTURE ARM SIZE FIXTURE UNIT 3 compartment sink 1 1/211, 2. 3, 4 2 compartment sink 1 1/28 1 Dishwasher 2" 4 Garbage grinder 28 4 Wok stove 2" 4 Floor Drains (28, 38, 48) 2., 38, 48 2, 3, 4 *Floor Sinks (3", 48) 3., 48 3, 4 *Note: For indirect waste systems where hub drains and floor sinks are used as receptors for dishwashers, 2 and 3 compartment sinks, etc. the fixture unit count shall be twice (2X) the trap arm size. Mop sink and hand sinks may be required to drain through a sand and grease interceptor, but shall not be included for interceptor sizing since they should not effect the grease loading on the interceptor. -17-