(A) Grease interceptors shall be installed by users as required by the Director or Building Inspector. Grease interceptors shall be installed at the user’s expense, when the user operates a cooking establishment. Grease interceptors may also be required in non-cooking or cold diary and frozen foodstuffs establishments and other industrial or commercial establishments when they are deemed necessary by the Director for the proper handling of liquid wastes containing grease. No user shall allow wastewater discharge concentration from subject grease interceptor to exceed 100 milligrams per liter, as identified by EPA Method 1664 and defined in § 51.052(C). All grease interceptors shall be of a type, design and capacity approved by the Director or Building Inspector and shall be readily and easily accessible for user cleaning and city inspection. All out-of-building grease interceptors shall have a slotted filter installed on the outlet pipe, designed to reduce grease concentrations. All the grease interceptors shall be serviced and emptied of accumulated waste content as required in order to maintain minimum design capability or effective volume of the grease interceptor, but not less often than every 60 days. Users who are required to pass water through a grease interceptor shall:
(1) Provide for a minimum hydraulic retention time of 24 minutes at actual peak flow or 12 minutes at the calculated theoretical peak flow rate as predicted by the Uniform Plumbing Code fixture criteria, between the influent and effluent baffles with 20% of the total volume of the grease interceptor being allowed for sludge to settle and accumulate, identified hereafter as a “sludge pocket”;
(2) Remove any accumulated grease cap and sludge pocket as required, but at intervals of not longer than 60 days or less as to be determined by the establishment’s grease loading in compliance with the grease trap inspector at the users’ expense. Grease interceptor shall be kept free of inorganic solid materials such as grit, rocks, gravel, sand, eating utensils, cigarettes, shells, towels, rags and the like which could settle into this pocket and thereby reduce the effective volume of the grease interceptor;
(3) Accept the following conditions: if any skimmed or pumped wastes or other materials removed from grease interceptor are treated in any fashion on-site and reintroduced back into the grease interceptor as an activity of and after the on-site treatment, the user shall be responsible for the attainment of established grease numerical limit consistent with and contained in this division (A) on all discharges of wastewater from the grease interceptor into the city’s sanitary sewer collection and treatment system;
(4) Operate the grease interceptor in a manner so as to maintain the device such that attainment of the grease limit is consistently achieved. CONSISTENT shall mean any wastewater sample taken from the grease interceptor shall be subject to terms of numerical limit attainment described in this division (A). If an establishment desires, because of documented space constraints, an alternate to an out-of-building grease interceptor, the request for an alternative location shall contain the following information:
(a) Location of city sewer main and easement in relation to available exterior space outside building; and
(b) Existing plumbing at or in a site that uses common plumbing for all services at that site.
(5) Understand and agree that the use of biological additives as a grease degradation agent is conditionally permissible, upon prior written approval by the Director. Any establishment using this method of grease abatement shall maintain the trap or interceptor in such a manner that attainment of the grease wastewater discharge limit, as measured from the trap’s outlet, is consistently achieved;
(6) Understand and agree that the use of automatic grease removal systems is conditionally permissible, upon prior written approval by the Director, the Building Inspector of the city and the County Department of Health. Any establishment using this equipment shall operate the system in such a manner that attainment of the grease wastewater discharge limit, as measured from the unit’s outlet, is consistently achieved; and
(7) Understand and agree that the Director, in consultation with the Building Inspector, reserves the right to make determinations of grease interceptor adequacy and need, base on review of all relevant information regarding grease interceptor performance, facility site and building plan review and to require repairs to, or modification or replacement of the traps.
(B) The user shall submit a copy of the receipt for each pumping event no later than ten days after trap has been pumped to:
Grease Trap Inspector/Pretreatment Coordinator P.O. Box 607 Whiteville, N.C. 28472
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(C) The user shall also maintain a written record of trap maintenance for three years. All the records will be available for inspection by the city at all times.
(D) No non-grease laden sources are allowed to be connected to sewer lines intended for grease interceptor service.
(E) Establishments that are required by this subchapter to install and maintain approved grease interceptors shall have a period of one year following the adoption of this subchapter to comply with the installation requirements. No establishment shall be exempt from the discharge limits defined in this subchapter or §§ 51.050 through 51.062 and shall be subject to enforcement procedures stipulated in §§ 51.058 and 51.999 upon violation.
(F) Access manholes, with a minimum diameter of 24 inches, shall be provided over each chamber and sanitary tree. The access manholes shall extend at least to finished grade and be designed and maintained to prevent water inflow or infiltration. The manholes shall also have readily removable covers to facilitate inspection, grease removal and wastewater sampling activities.
(G) The city shall be allowed access to all grease interceptors for inspection and sampling activities.
(H) Failure to achieve limits on grease discharges from grease interceptors or an obstruction of a city sewer main(s) occurs that causes a sewer overflow to the extent that an impact on the environment is realized and that the overflow or failure of the sanitary sewer collection system to convey sewage can be attributed in part or in whole to an accumulation of grease in the city’s sewer main(s), shall result in enforcement action by the city, as stipulated in the city’s industrial pretreatment enforcement plan and §§ 51.050 through 51.062, against the generator or contributor of the grease.
(2009 Code, § 51.67) (Ord. passed 8-14-2007) Penalty, see § 51.999