18-29-1003.3.3 Grease interceptors and discharge.

   No grease interceptor or separator shall receive the discharge from a food waste disposal or a commercial dishwashing machine.

(Amend Coun. J. 7-29-15, p. 3537, § 4)

18-29-1003.3.4 Construction materials.

   All grease interceptors, separators and catch basins located within buildings shall be constructed of precast concrete, concrete with the bottom, sides and baffles poured monolithically, heavy cast-iron or equally durable metal, fiberglass or high-density polyethylene, and shall be vented as provided with a gas tight metal cover, securely fastened.

(Amend Coun. J. 7-29-15, p. 3537, § 4)

18-29-1003.3.5 Types.

   Type of interceptor required for commercial kitchens and multiple residential dwelling units exceeding six dwelling units shall be determined by the department of water management.

(Amend Coun. J. 11-8-12, p. 38872, § 374)

18-29-1003.3.6 Grease trap capacity.

   Grease traps shall have the grease retention capacity indicated in Table 18-29-1003.3.6 for the flow- through rates indicated.

Table 18-29-1003.3.6
Capacity of Grease Traps

Total Flow-Through Rating (gpm)	Grease Retention Capacity (pounds)
4	8
6	12
7	14
9	18
10	20
12	24
14	28
15	30
18	36
20	40
25	50
35	70
50	100

 

For SI: 1 gpm = 3.785 L/m, 1 pound = 0.454 kg.

18-29-1003.3.7 Rate of flow controls.

   Inside grease traps shall be equipped with devices to control the rate of water flow so that the water flow does not exceed the rated flow. The flow-control device shall be vented and terminate not less than 6 inches (150 mm) above the flood rim level or installed in accordance with the manufacturer's instructions.

18-29-1003.3.8 Efficiency of interceptors.

   Interceptors shall conform to PDI G 101 or ASME 112.14.3, and shall be installed in accordance with the manufacturer's instructions.

(Amend Coun. J. 7-29-15, p. 3537, § 4)

18-29-1003.4 Grease catch basins outside.

   A grease catch basin located outside a building shall be of heavy cast iron or equally durable metal, approved fiberglass or high-density polyethylene, concrete, precast in blocks or monolithic or a brick construction with the block or brick laid up in portland cement mortar with walls not less than 5 inches (125 mm) thick, and bottom not less than 2 inches (50 mm) thick. The basin shall be watertight. The basin shall be not less than 36 inches (914 mm) in diameter below the top of the highest inlet pipe. The bottom of the basin shall be not less than 36 inches (914 mm) below the invert of the outlet pipe. The outlet pipe shall be trapped with a catch basin trap and of material as required by this chapter. The catch basin trap shall have a minimum seal of 4 inches (100 mm) and shall have an accessible cleanout of a minimum of 3 inches (75 mm).

(Amend Coun. J. 7-29-15, p. 3537, § 4)