Loading...
The purpose of this article shall be to aid in the prevention of sanitary sewer blockages and obstructions from contribution and accumulation of fat, oil, and grease (FOG) into the POTW. Such discharges from commercial kitchens, restaurants, food processing facilities and all other establishments, where FOG of vegetable or animal origin are discharged directly or indirectly into the POTW, can contribute to line blockages and/or spills in violation of title 40, code of federal regulations, part 403. (Ord. 5256, 11-24-2014)
The definitions found in section 8-3-3 of this chapter shall apply to the provisions of this article, provided, however, that the following words, terms and phrases, when used in this article, shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning:
BEST MANAGEMENT PRACTICES OR BMPs: Schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of waters of the state. For purposes of this article, best management practices include procedures and practices that reduce the discharge of FOG from a food service establishment, to the city sanitary sewer system and to the POTW.
DESIGN LIQUID DEPTH: The maximum depth of liquid when the tank is filled with water.
EFFECTIVE DATE: The date set forth in section 8-3E-3 of this article, upon which the regulatory provisions of this article take effect.
FOG: Fats, oils, and greases of vegetable or animal origin contained in wastewater from a food service establishment.
FOOD SERVICE ESTABLISHMENT OR FSE: An operation or enterprise that stores, prepares, packages, serves, vends, or otherwise provides food for human consumption, and which has been licensed by the state of Iowa under title IV - public health, chapter 137F, food establishments and food processing plants, of the Iowa Code. Such facilities may include, but are not limited to, those that process meat or other food ingredients as an intermediate step or for final human consumption, food service operations in a summer camp, residential substance abuse treatment facility, halfway house, correctional facility, school, restaurant, commercial kitchen, caterer, church, hotel, bars, hospital, prison, care institution or similar facility.
In addition, any unlicensed operation or enterprise described above which has been determined by the superintendent through means of sewer televising, sampling of wastewater or other such investigative measures, to be creating FOG related problems in the sanitary sewer system shall be considered a food service establishment subject to the provisions of this article.
GREASE INTERCEPTOR: A tank that serves one or more fixtures and is remotely located. Grease interceptors include, but are not limited to, tanks that capture wastewater from dishwashers, garbage disposals, floor drains, pot and pan sinks and trenches as allowed by local plumbing codes. For purposes of this article, a grease interceptor is a multicompartment tank located underground outside of a building that reduces the amount of FOG in wastewater prior to its discharge into the POTW.
GREASE TRAP: A device designed to retain grease from one to a maximum of four (4) fixtures. For purposes of this article, a grease trap is typically a small device located within a building.
mg/l (MILLIGRAMS PER LITER): A measure of the concentration of a pollutant in the waste stream, considered equivalent to parts per million (ppm).
MINIMUM DESIGN CAPABILITY: The design features of a grease trap or grease interceptor and its ability or volume required to effectively intercept and retain FOG from grease laden wastewaters discharged to the POTW.
NONROUTINE INSPECTION: An unscheduled inspection of an FSE made without prior notification or arrangement.
ROUTINE INSPECTION: An inspection of an FSE which is scheduled in advance or according to a prearranged schedule.
SUPERINTENDENT: Superintendent of the waste management services department, or his designated representative.
USER: A person discharging anything other than domestic wastewater into the POTW which may contain FOG, and may include discharges from mobile sources, such as mobile food vendors.
WASTE MANAGEMENT SERVICES DEPARTMENT: City of Waterloo staff responsible for the city's sanitary sewer system and wastewater treatment facilities, which are also referred to as the publicly owned treatment works (POTW). (Ord. 5256, 11-24-2014; amd. Ord. 5349, 4-18-2016)
The owner of a building or facility in which an FSE is located, and the owner or operator of an FSE, shall be required to install a grease trap, grease interceptor, or other facilities to capture FOG from the waste stream prior to discharge to the POTW, and to thereafter operate and maintain same to meet the limits of one hundred milligrams per liter (100 mg/l) - total FOG as provided in this article. (Ord. 5256, 11-24-2014)
The requirements of section 8-3E-4 of this article shall not apply to that portion of a building or facility within which an FSE is in existence on the effective date if:
A. The FSE has an existing grease interceptor or grease trap in place as of the effective date and provided that: 1) the owner or occupant of the FSE continues to use the interceptor or trap, 2) the interceptor or trap is of sufficient capacity and design, and 3) the interceptor or trap is operated and maintained so as to comply with FOG discharge limits. (Ord. 5256, 11-24-2014)
A. After the effective date, any permitted construction under section 8-3E-4 of this article shall be deemed compliant upon issuance of a certificate of compliance or certificate of occupancy for such construction by the city building official or designee.
B. The existing facilities of an FSE shall be deemed compliant, unless the superintendent, or city building official or designee, determines that an existing grease trap or grease interceptor is incapable of adequately retaining FOG. In such cases, the superintendent may order the FSE to install an adequate grease trap or grease interceptor within a specified time period if:
1. The FSE is found to contribute FOG in quantities above FOG discharge limits; or
2. The FSE discharges necessitate increased maintenance on the POTW in order to keep blockages from occurring therein; or
3. The FSE's discharge to the POTW is at any time determined to exceed one hundred milligrams per liter (100 mg/l) - total FOG.
C. An order directing an existing FSE or the owner or operator of the FSE or the owner of the building or facility in which the FSE is located to install a grease interceptor shall be in writing from the superintendent in the form of a notice of violation including a corrective action order, as provided in section 8-3E-13 of this article.
D. FSEs or owners of buildings or facilities within which an FSE is located which are unable to install or replace a grease interceptor due to exceptional physical constraints or economic hardship may appeal to the superintendent for approval of an alternative grease control technology by requesting a hearing in accordance with the provisions of this article. Such requests shall be submitted in writing and shall include detailed descriptions of the FSE's physical or financial constraints and of the alternative grease control technology which it proposes to install and utilize. Adding emulsification agents or other chemicals or enzymes to the waste stream to address the grease discharge issues from the FSE are not considered acceptable alternatives for FOG removal.
1. Notwithstanding approval of alternative grease control technology, when the superintendent determines that such alternative is not performing adequately, the FSE or owner of the building or facility in which the FSE is located shall be required to take additional grease control measures, which may include the installation of a grease interceptor.
2. In order to demonstrate exceptional physical site constraints preventing the installation of a grease interceptor, the owner or operator of the FSE or owner of the building or facility in which the FSE is located shall submit to the superintendent documentation and plats showing the location of city sanitary sewer and any private easements in relation to the building sewer for the building housing the FSE, and showing available space inside or outside the building and drawings of existing plumbing at or in a site that uses common plumbing for all services at that site.
3. An FSE that is given an exemption from installing a properly sized grease interceptor is prohibited from installing or using a dishwasher or garbage disposal without approval of the superintendent and must comply with the conditions of such approval, if any. (Ord. 5256, 11-24-2014)
Grease interceptors and grease traps, when required, shall be installed as follows:
A. Grease interceptors and grease traps shall be installed at the expense of the owner or operator of the FSE or owner of the building or facility in which the FSE is located which is contributing wastewater to the POTW.
B. All wastewater streams containing FOG or reasonably likely to contain FOG within FSEs or other FOG generating operations shall be directed into one or more appropriately sized grease traps or grease interceptors before discharge to the POTW.
It is the responsibility of the FSE to determine the appropriate sizing of any grease traps, grease interceptors, or other grease removal facilities. The discharge from the FSE shall be operated and maintained by the FSE such that the FOG shall not exceed one hundred milligrams per liter (100 mg/l) - total FOG.
Grease removal facilities may be sized by considering the peak design flow rates for all fixtures leading to the grease interceptor and allowing a minimum retention time of thirty (30) minutes or as follows:
Grease interceptor sizing: |
Grease interceptor sizing: | ||||
1. | Peak meals per hour: | |||
a. Seating capacity of FSE | ||||
b. Occupancy of FSE | 1 | |||
c. Seating or occupancy x meal factor of 1.3 (45 minute meal) = Peak meals per hour | ||||
2. | Waste flow rate, gallons of flow: | |||
a. Commercial, equipped kitchen with dishwasher and 1 garbage disposal2 | 7 | |||
b. Commercial, equipped kitchen with dishwasher, no garbage disposal | 6 | |||
c. Commercial, equipped kitchen with no dishwasher, 1 garbage disposal2 | 6 | |||
d. Commercial, equipped kitchen with no dishwasher, no garbage disposal | 5 | |||
e. Single service kitchen3 | 2 | |||
3. | Retention time, hours: | |||
a. Commercial kitchen | 2.5 | |||
b. Single service kitchen | 1.5 | |||
4. | Storage factor: | |||
a. Commercial kitchen up to 8 hours of operation | 1 | |||
b. Commercial kitchen up to 16 hours of operation | 2 | |||
c. Commercial kitchen up to 24 hours of operation | 3 | |||
d. Single service kitchen | 1.5 | |||
Peak meals per hour | x | Waste flow rate | x | Retention time | x | Storage factor | = | Calculated interceptor size |
Notes:
1. Church: include all area(s) used for meal service.
Assisted living/nursing facility: equal to maximum number of residents (per state license).
2. Each additional garbage disposal, add 1 gallon.
3. Single service kitchen = no garbage disposal, no dishwasher and all service is single use.
It is the FSE's responsibility to size the FOG removal system and to operate it to meet the requirements of this article.
C. Concrete grease interceptors, whether precast or poured in place, shall be designed and manufactured in accordance with ASTM C1613-08 standard specification for precast concrete grease interceptor tanks or IAPMO/ANSI Z1001 prefabricated gravity grease interceptors and shall be installed in accordance with the codes adopted by the city. Grease interceptors using materials other than concrete require approval by the superintendent, and shall comply with the conditions of such approval, if any.
D. The building official or other designated official of the city shall inspect each grease interceptor installation made pursuant to this article, shall review all relevant information regarding the rated performance of the grease interceptor, and the building plan and facility site plan for the building and site where the grease interceptor has been installed, and shall approve such grease interceptor installation upon determination that the grease interceptor meets all applicable standards and requirements.
E. Grease interceptors shall be installed outside the building housing the FSE and below surface grade, and shall have access manholes, with a minimum diameter of twenty four inches (24"), over each chamber and sanitary tee. Access manholes shall extend from the grease interceptor to at least the finished surface grade and be designed and maintained to prevent storm or surface water inflow and groundwater infiltration. The manholes shall also have readily removable covers to facilitate inspection and grease removal.
F. Sewer lines which are not grease laden, which are not likely to contain FOG, or which contain sanitary wastes shall not be connected to a grease interceptor.
G. Grease interceptors shall be equipped with an accessible discharge sampling port with a minimum six inch (6") diameter, which shall extend from the grease interceptor to at least the finished surface grade.
H. Where grease interceptors are shared by more than one FSE, the building owner shall be the responsible party for recordkeeping and cleaning of the interceptor. (Ord. 5256, 11-24-2014)
Loading...