15.08.110 Pretreatment Facilities.
A. All general users shall provide all known, available and reasonable methods of prevention, control and treatment as required to comply with this ordinance and shall achieve compliance with all applicable pretreatment standards and requirements set out in this ordinance within the time limitation specified by the EPA, the State or the City, whichever is more stringent.
Any facilities required to pretreat wastewater to a level acceptable to the City shall be provided, operated and maintained at the user’s expense.
The City may establish best management practices (BMPs) for particular groups of users. These BMPs may include, but are not limited to, types or methods of pretreatment technology to be used, methods of source control, minimum maintenance requirements, drag out prevention practices, spill prevention practices, or other requirements as deemed necessary. The City may establish BMPs in lieu of numerical limits for noncategorical users.
When required by the City, an engineering report as required by, and complying with, Chapter 172-240 WAC, including detailed plans showing the pretreatment facilities and operating procedures, shall be submitted to the City for review, and shall be acceptable to the City before construction of the facility. The review of such plans and operating procedures will in no way relieve the user from the responsibility of modifying the facility as necessary to produce an acceptable discharge to the City under the provisions of this ordinance.
Within ninety (90) days after the completion of the wastewater pretreatment facility, the discharger shall furnish as-built drawings and its operations and maintenance procedures (manual). Any subsequent significant changes in the pretreatment facility or method of operation shall be reported to and approved in writing by the City prior to the initiation of the changes. Such pretreatment facilities will be under the control and directions of an employee of the user trained and qualified to operate such system.
New sources and new users determined to be significant industrial users (SIUs) must have pretreatment facilities installed and operating, if required, prior to discharge.
B. Users who operate automatic and coin-operated laundries, car washes, filling stations, commercial garages or similar businesses having any type of washing facilities (including pressure washing and steam cleaning) or any other dischargers producing grit, sand, oils, lint or other materials which have the potential of causing partial or complete obstruction of the POTW shall, upon order of the City, install approved interceptors, oil/water separators, or tanks in accordance with specifications adopted by the City such that excessive amounts of oil, sand and inert solids are effectively prevented from entering the POTW.
C. All grease interceptors, oil/water separators, settling tanks, grease and grit traps shall be properly installed, maintained and operated by the user at their own expense. The installation shall be kept in continuous operation at all times, and shall be maintained to provide efficient operation.
Cleaning must be performed by a service contractor qualified to perform such cleaning, or other qualified and trained personnel, and in a manner approved by the City. All material removed shall be disposed of in accordance with all State and Federal regulations. Records and certification of maintenance shall be made readily available to the City for review and inspection, and must be maintained for a minimum of three (3) years. Maintenance records must include the date, action taken and who performed the maintenance. If a service contractor performed the maintenance the user must record the company’s name, address, telephone number and name of operator.
If a failure to maintain or effectively operate grease interceptors, oil/water separators, settling tanks, grease and grit traps or any other approved pretreatment device results in partial or complete blockage of the POTW, or other parts of the City sewer system, or adversely affects the treatment or transmission capabilities of the POTW, or requires excessive maintenance by the City, or poses a possible health hazard, the user responsible for the facilities shall be subject to the remedies herein, including cost recovery, enforcement and penalties.
The user shall control production and/or discharges upon reduction, loss, failure or bypass of the pretreatment facility until the facility is restored or an alternative method of treatment is provided. This requirement applies in the situation where, among other things, the primary source of power to the treatment facility is reduced, lost, or fails.
D. Each facility required to install and maintain a grease interceptor, oil/water separator, settling tank, grease trap and/or grit trap under this ordinance shall provide regular maintenance of said device to the satisfaction of the City in accordance with the requirements set forth in this ordinance.
Each person who removes waste from the device shall, to the extent technically and mechanically possible, remove the entire contents and shall comply with the following:
1. All grease interceptors, oil/water separators, settling tanks, grease and/or grit traps shall be maintained by the user at the user’s expense. Maintenance shall include the complete removal of all contents including floating materials, wastewater, and bottom sludge and solids. Decanting or discharging of removed waste back into the device from which the waste was removed or any other device, for the purpose of reducing the volume to be hauled, is prohibited.
2. All grease interceptors and oil/water separators must be pumped out completely once every six (6) months, or more frequently if deemed necessary by the City. Exception to this minimum frequency of pumping may be made with written approval from the City for generators of small quantities of waste.
3. All waste removed from each grease interceptor or oil/water separator must be disposed of at a facility permitted by the Health Department, or other appropriate agency, in the county in which the disposal facility is located. Under no circumstances shall the waste be discharged to any part of the POTW.
4. A log indicating each cleaning and/or pumping of a grease interceptor, oil/water separator, settling tank, grease and/or grit trap for the previous twelve (12) months shall be maintained by each user. This log shall include date, time, amount removed, employee or hauler, including name of operator(s) on site and disposal site and shall be kept in a conspicuous location for inspection by Health Department or City personnel. Logs will be maintained on site and available for minimum of three (3) years.
5. The information required in the maintenance log shall be submitted to the City annually. The reporting period shall be from October 1st through September 30th of each year. The report shall be submitted within thirty (30) days after the end of the reporting period. The City will send an annual reminder letter of this requirement to be mailed in September. The corresponding report is due to the City no later than October 31st each year.
6. Each grease interceptor, oil/water separator, settling tank, grease and/or grit trap cover shall be readily accessible for service and maintenance to ensure it is in good working and operating condition. The use of ladders or the removal of bulky equipment in order to service the device shall constitute a violation of this ordinance. Location of all devices shall be shown on the approved building plan.
7. All grease interceptors, oil/water separators, settling tanks, grease and/or grit traps shall be provided with a sample box located at the outlet end so that periodic sampling of effluent quality can occur. (Ord. 2351, 2018)