N.J. Admin. Code § 7:9A-8.1 - Grease removal and high strength wastewater pretreatment components

(a) Restaurants, cafeterias, institutional kitchens and other facilities discharging large quantities of grease shall use a grease trap and a high strength wastewater pretreatment component. A garbage grinder shall not be used when grease removal components are required.
(b) The grease trap shall be installed in a separate line serving that part of the plumbing system into which the grease will be discharged. The grease trap shall be located close to the source of the wastewater, where the wastewater is still hot, to facilitate separation. Grease traps shall be located, designed and constructed in a manner that will permit easy access and cleaning.
(c) The following equation shall be used to determine the minimum size required for grease traps serving restaurants: Q = (D) x (HR/2) x (12.5) x (LF), where

Q = size of grease trap in gallons;

D = number of seats in dining area;

HR = number of hours open per day; and

LF = loading factor depending on restaurant location:

1.25 for interstate freeways;

1.0 for other freeways;

1.0 for recreation areas;

0.8 for main highways;

0.5 for other highways.

(d) The following equation shall be used to determine the minimum size required for grease traps serving cafeterias and institutional kitchens: Q = (M) x (11.25) x (LF), where:

Q = size of grease trap, gallons;

M = total number of meals served per day; and

LF = loading factor depending on type of facilities present:

1.0 with dishwashing;

0.5 without dishwashing.

(e) In no case shall a grease trap serving a restaurant, cafeteria or institutional kitchen be smaller than 750 gallons in capacity.
(f) The minimum requirements for construction, materials and foundations of grease traps shall be the same as those required for septic tanks, as prescribed in 7:9A-8.2.
(g) The inlet and outlet of the grease trap shall be provided with "T" baffles extending to a depth of 12 inches above the tank floor and well above the liquid level.
(h) To facilitate maintenance, manholes extending to finished grade shall be provided. Covers shall be of gas-tight construction and shall be designed to withstand expected loads and prevent access by children.
(i) High strength wastewater pretreatment components shall be approved by the administrative authority only if the components are designed, constructed and certified by a septic system designer to actively treat and therefore reduce fats, oils and grease, total suspended solids, biochemical oxygen demand and chemical oxygen demand. The components shall be designed to meet the following effluent criteria:

Constituent Concentration (mg/L)
Total suspended solids (TSS) 155
Five-day biochemical oxygen demand (BOD[5]) 155
Fats, oils and grease (FOG) 70
Chemical oxygen demand (COD) 500
(j) The septic system designer certification of the high strength wastewater pretreatment components must specify how the grease removal components are to be installed and maintained to achieve the identified effluent design criteria.
(k) Grease removal components must be equipped with audio and visual alarms to identify when the storage capacity of the system has reached 75 percent. When the storage capacity reaches 75 percent, the operator of the system shall take immediate steps to maintain effluent criteria by ensuring that grease is removed from the system. Disposal of grease must be in compliance with all local, State and Federal requirements.
(l) Any grease removal components that are not operated and maintained in conformance with the original administrative authority approval or manufacturer's specifications shall be considered non-compliant with 7:9A-3.4.


N.J. Admin. Code § 7:9A-8.1
Amended by R.2012 d.066, effective 4/2/2012.
See: 43 N.J.R. 478(a), 44 N.J.R. 1047(a).
Section was "Grease traps". In (a), substituted "facilities" for "installations" and "grease removal components are" for "a grease trap is", and inserted "and a high strength wastewater pretreatment component"; and added (i) through ( l).

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