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In areas of garages where motor fuels are dispensed or where motor vehicles are serviced, each floor drain shall be properly trapped. In other garage areas or parking facilities, floor drains need not be trapped. Floor drains above the level of the basins shall connect to a stack extending independently to the outer air and the vents of the basins shall be connected 6 inches (152 mm) or higher than the lowest floor drain.
A mixture of treated or untreated light and heavy liquids with various specific gravities shall be separated in approved receptacle. Separators shall be designed in accordance with Sections 18-29-1003.7.1 and 18-29-1003.7.2.
Where automobiles are serviced, greased, repaired or washed or where gasoline is dispensed, separators shall have a minimum capacity of 6 cubic feet (0.17 m
3
) for the first 100 square feet (9.3 m
2
) of area to be drained into the separator. Parking garages in which servicing, repairing or washing is not conducted, and in which gasoline is not dispensed, shall require a triple basin. Areas of commercial garages utilized only for storage of automobiles are required to be drained through a triple basin.
Commercial laundries shall be equipped with an interceptor with a wire basket or similar device, removable for cleaning, that prevents passage into the drainage system of solids 1/2 inch (12 mm) or larger in size, string, rags, buttons, or other materials detrimental to the public sewage system.
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