Repair garages and gasoline
stations with grease racks or grease pits, and factories
that have oily, flammable, or both types of wastes as a result
of manufacturing, storage, maintenance, repair, or testing
processes, shall be provided with an oil or flammable liquid
interceptor that shall be connected to necessary floor drains.
The separation or vapor compartment shall be independently
vented to the outer air. Where two or more separation or vapor
compartments are used, each shall be vented to the outer air
or shall be permitted to connect to a header that is installed at
a minimum of 6 inches (152 mm) above the spill line of the
lowest floor drain and vented independently to the outer air.
The minimum size of a flammable vapor vent shall be not
less than 2 inches (50 mm), and, where vented through a sidewall,
the vent shall be not less than 10 feet (3048 mm) above
the adjacent level at an approved location. The interceptor
shall be vented on the sewer side and shall not connect to a
flammable vapor vent. Oil and flammable interceptors shall
be provided with gastight cleanout covers that shall be readily
accessible. The waste line shall be not less than 3 inches
(80 mm) in diameter with a full-size cleanout to grade. Where
an interceptor is provided with an overflow, it shall be provided with an overflow line [not less than 2 inches (50 mm)
in diameter] to an approved waste oil tank having a minimum
capacity of 550 gallons (2082 L) and meeting the requirements
of the Authority Having Jurisdiction. The waste oil
from the separator shall flow by gravity or shall be pumped
to a higher elevation by an automatic pump. Pumps shall be
adequately sized and accessible. Waste oil tanks shall have a
2 inch (50 mm) minimum pump-out connection at grade and
an 11/2 inch (40 mm) minimum vent to atmosphere at an
approved location not less than 10 feet (3048 mm) above
grade.
Each manufactured interceptor
that is rated shall be stamped or labeled by the manufacturer
with an indication of its full discharge rate in gpm
(L/s). The full discharge rate to such an interceptor shall be
determined at full flow. Each interceptor shall be rated equal
to or greater than the incoming flow and shall be provided
with an overflow line to an underground tank.
Interceptors not rated by the manufacturer shall have a depth of not less than 2 feet (610 mm) below the invert of the discharge drain. The outlet opening shall have not less than an 18 inch (457 mm) water seal and shall have a minimum capacity as follows: Where not more than three motor vehicles are serviced, stored, or both, interceptors shall have a minimum capacity of 6 cubic feet (0.2 m3), and 1 cubic foot (0.03 m3) of capacity shall be added for each vehicle up to 10 vehicles. Above 10 vehicles, the Authority Having Jurisdiction shall determine the size of the interceptor required. Where vehicles are serviced and not stored, interceptor capacity shall be based on a net capacity of 1 cubic foot (0.03 m3) for each 100 square feet (9.29 m2) of the surface to be drained into the interceptor, with a minimum of 6 cubic feet (0.2 m3).
Interceptors not rated by the manufacturer shall have a depth of not less than 2 feet (610 mm) below the invert of the discharge drain. The outlet opening shall have not less than an 18 inch (457 mm) water seal and shall have a minimum capacity as follows: Where not more than three motor vehicles are serviced, stored, or both, interceptors shall have a minimum capacity of 6 cubic feet (0.2 m3), and 1 cubic foot (0.03 m3) of capacity shall be added for each vehicle up to 10 vehicles. Above 10 vehicles, the Authority Having Jurisdiction shall determine the size of the interceptor required. Where vehicles are serviced and not stored, interceptor capacity shall be based on a net capacity of 1 cubic foot (0.03 m3) for each 100 square feet (9.29 m2) of the surface to be drained into the interceptor, with a minimum of 6 cubic feet (0.2 m3).