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SPS 382.34(5)(e)(e) Prohibited treatment. The introduction of grease or fat emulsifiers into a grease interceptor shall be prohibited. SPS 382.34(6)(6) Automatic car washes. The wastes of floor drains and drain inlets of automatic car washes shall discharge through an approved car wash interceptor. SPS 382.34(6)(a)(a) Design. Except as provided in subds. 1. and 2. and par. (b), car wash interceptors shall be constructed and installed in accordance with sub. (4) (a) 2. SPS 382.34(6)(a)1.1. The interceptor’s outlet shall be submerged to form a trap with a water seal of at least 15”. SPS 382.34(6)(a)2.2. The bottom of the trap’s water seal shall be at least 30” above the bottom of the interceptor. SPS 382.34(6)(b)(b) Capacity. The minimum liquid capacity of the interceptor shall be based on the maximum flow rate of water through the interceptor in gallons per minute. SPS 382.34(6)(b)1.1. Between the waterline and the bottom of the trap seal of the outlet, the interceptor shall have a capacity value equal to at least 5 times the maximum flow rate. SPS 382.34(6)(b)2.2. Below the bottom of the trap seal of the outlet, the interceptor shall have a capacity value equal to at least 15 times the maximum flow rate. SPS 382.34(6)(c)(c) Hand-held car washing wands. The wastes of floor drains and drain inlets serving 2 or more hand-held car washing wands shall discharge through an approved car wash interceptor. The wastes of one hand-held car washing wand may discharge to a garage catch basin. SPS 382.34(7)(7) Commercial laundries. Wastes from gravity dump-type clothes washing equipment shall be discharged through an approved laundry interceptor in accordance with this subsection. SPS 382.34(7)(a)(a) Screening apparatus. A laundry interceptor shall be equipped with a wire basket or other device which will prevent the passage of solids, 1⁄2” or larger in diameter, string, buttons and other detrimental materials into the drain system. SPS 382.34(7)(b)(b) Trench type interceptors. A floor receptor, trench or trough as specified in s. SPS 382.33 (9) (c) 3., may serve as a laundry interceptor, if no oils or quantities of sand are discharged into it. SPS 382.34(7)(c)1.1. In-line interceptors shall have a minimum inside diameter or horizontal dimension of 24”. SPS 382.34(7)(c)3.a.a. The vent shall extend from above the flow line to a vent terminal in accordance with s. SPS 382.31 (16) or shall be connected to the venting system serving the sanitary drain system. SPS 382.34(7)(c)3.b.b. The diameter of the vent shall be at least one-half of the diameter of the interceptor’s outlet, but not less than 2”. SPS 382.34(7)(c)4.4. The outlet for an in-line interceptor shall be at least 4″ in diameter. The outlet shall be submerged to form a trap with a water seal of at least 12”. The bottom of the trap’s water seal shall be at least 12” above the bottom of the interceptor. SPS 382.34(7)(c)5.5. The waterline in an in-line interceptor shall be at least 2” below the bottom of the inlet opening for the interceptor. SPS 382.34(8)(8) Oil and flammable liquids. Oily and flammable wastewater that discharges to a building sewer shall be intercepted or treated by a means acceptable to the department. SPS 382.34(8)(a)(a) Site-constructed interceptors. Site-constructed interceptors shall be designed in accordance with the requirements in sub. (4) (a) 2. SPS 382.34(8)(b)(b) Prefabricated oil interceptors and separators. Prefabricated oil interceptors and separators shall be manufactured with adequate capacity for the anticipated load. SPS 382.34(8)(c)(c) Venting. Oil and flammable interceptors and separators shall be so designed to prevent the accumulation of explosive gases. SPS 382.34(8)(c)1.1. A covered interceptor or separator shall be provided with an individual vent of at least 3 inches in diameter. The vent shall extend from the top of the interceptor or separator or as high as possible, from the side of the interceptor or separator to a point at least 12 feet above grade. SPS 382.34(8)(c)2.2. The drain pipe to the interceptor or separator shall be provided with a fresh air inlet connected within 2 feet of the inlet of the interceptor or separator. The fresh air inlet shall terminate at least one foot above grade, but not less than 6 feet below the terminating elevation of the vent serving the interceptor or separator. The fresh air inlet shall be at least 3 inches in diameter.