(A)
Grease interceptors shall be installed and maintained at the user’s expense when a user operates a food service establishment. Grease interceptors may be required in noncooking or cold dairy and frozen foodstuffs establishments and other industrial or commercial establishments when the establishment generates wastewater containing fats, oils, or grease and the City Manager determines an interceptor is necessary to prevent contribution or accumulation of grease to the sanitary sewer collection and treatment system. Upon notification by the City Manager or designee that the user is subject to the terms of an enforcement action, as stipulated in the FOG control plan contained within the City’s sewer system management plan, said user shall not allow wastewater discharge concentration from subject grease interceptor to exceed an establishment action level of two hundred (200) milligrams per liter, expressed as hexane extractable material. All grease interceptors shall be of a type, design, and capacity approved by the City Manager and shall be readily and easily accessible for maintenance and repair, including cleaning and for City inspection. All 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 sixty (60) days or as permitted in a valid program modification. Users who are required to pass wastewater containing FOG through a grease interceptor shall:
(1)
Obtain a wastewater contribution permit as required under Articles 4 and 8 of this Chapter.
(2)
Provide for a minimum hydraulic retention time of twenty-four (24) minutes at actual peak flow between the influent and effluent baffles, with twenty-five percent (25%) of the total volume of the grease interceptor being allowed for any food-derived solids to settle or accumulate and floatable grease derived materials to rise and accumulate, identified hereafter as a solids blanket and grease cap respectively.
(3)
Remove any accumulated grease cap and solids blanket as required, but at intervals of not longer than sixty (60) days at the user’s expense, or in accordance with a valid program modification or other City Manager’s requirements. Grease interceptors shall be kept free of inorganic solid materials, such as grit, rocks, gravel, sand, eating utensils, cigarettes, shells, towels, rags, etc., which could settle into this solids blanket and thereby reduce the effective volume of the grease interceptor.
(4)
Operate and maintain the grease interceptor to achieve and consistently maintain any applicable grease action level. “Consistent” shall mean any wastewater sample taken from such grease interceptor must meet the terms of numerical limit attainment described in subsection (A) of this Section. If a user documents that conditions exist (“space constraints”) on their establishment site that limit the ability to locate a grease interceptor on the exterior of the establishment, the user may request an interior location for the interceptor. Such request shall contain the following information:
(a)
Location of City sewer main and easement in relation to available exterior space outside building.
(b)
Existing plumbing layout at or in a site.
(c)
A statement of understanding, signed by the user or authorized agent, acknowledging and accepting conditions the City Manager may place on permitting an identified interior location. Conditions may include requirements to use alternative mechanisms, devices, procedures, or operations relative to an interior location.
(d)
Such other information as may be required by the City Manager.
(5)
The use of biological or other additives as a grease degradation or conditioning agent is permissible only upon prior written approval of the City Manager. Any user using biological or other additives shall maintain the trap or interceptor in such a manner that attainment of any grease wastewater, action level, solids blanket or grease cap criteria, goal or directive, as measured from the grease interceptor outlet or interior, is consistently achieved.
(6)
The use of automatic grease removal systems is permissible only upon prior written approval of the City Manager. Any user using a grease interceptor located on the interior of the site shall be subject to any operational requirements set forth by the City Manager and County Health Department. Any user 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 as required in subsection (A) of this Section.
(7)
The City Manager may make determinations of grease interceptor adequacy need, design, appropriateness, application, location, modification(s), and conditional usage based on review of all relevant information regarding grease interceptor performance, facility site and building plan review by all regulatory reviewing agencies and may require repairs to, or modification or replacement of, grease interceptors.
(B)
The user shall maintain a written record of grease interceptor maintenance for three years. All such records will be available for inspection by the City at all times. These records shall include:
(1)
User name and physical location;
(2)
Date of grease interceptor service;
(3)
Time of grease interceptor service;
(4)
Name of grease interceptor service company;
(5)
Name and signature of grease interceptor service company agent performing said service;
(6)
Established service frequency and type of service: full pumpout, partial pumpout, on-site treatment (type or nature of operations);
(7)
Number and size of each grease interceptor serviced at location;
(8)
Approximated amount, per best professional judgment of contract service provider, of grease and solids removed from each grease interceptor;
(9)
Total volume of waste removed from each grease interceptor;
(10)
Destination of removed wastes, food solids, and wastewater disposal;
(11)
Signature and date of user personnel confirming service completion;
(12)
Such other information as required by City Manager.
(C)
No nongrease-laden sources are allowed to be connected to sewer lines intended for grease interceptor service.
(D)
Access manhole covers shall have an installed diameter of twenty-four (24) inches, a maximum weight of fifty (50) pounds, and shall be provided over each chamber, interior baffle wall, and each sanitary tee. The access penetrations, commonly referred to as “risers,” into the grease interceptor shall also be, at a minimum, twenty-four (24) inches in diameter. 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.
(E)
A user may request a modification to the following requirements of this Chapter. Such request for a modification shall be in writing and shall provide the information set forth below:
(1)
The user’s grease interceptor pumping frequency. The City Manager may modify the sixty (60) day grease interceptor pump out frequency when the user provides data and performance criteria relative to the overall effectiveness of a proposed alternate and such can be substantiated by the City Manager. Proposed alternatives may include: grease interceptor pumping or maintenance matters, bioremediation as a complement to grease interceptor maintenance, grease interceptor selection and sizing criteria, on-site grease interceptor maintenance, and specialized ware washing procedures.
(2)
Grease Interceptor Maintenance and Service Procedures. The City Manager may modify the method(s) or procedure(s) utilized to service a grease interceptor when the user provides data and performance criteria related to the overall effectiveness of a proposed alternate method or procedure and such can be substantiated by the City Manager. If a modification to maintenance and service procedures is permitted, it shall be a conditional discharge permit approval.
(3)
Any modification must be approved by the City Manager in written form before implementation by the user or the user’s designated service provider. The user shall pay applicable fees as set forth in this Chapter.