(A) Pretreatment required.
(1) Pretreatment to remove or reduce the concentration of pollutants in wastewater before discharge to the city sewer and treatment system is required, if the pollutant(s) exceed the discharge limitations of § 50.16 of this code.
(2) Where necessary, as determined by the Director of Public Works, the owner shall provide, at his or her expense, the pretreatment needed resulting from the following:
(a) BOD of over 300 mg/I and suspended solids over 350 mg/I by weight;
(b) Objectionable constituents above the levels listed under discharge limitations;
(c) Excessive quantities and rates of discharges of such waters or wastes.
(B) Pretreatment method and plans.
(1) The method of pretreatment and plans, specifications, and any other pertinent information relating to proposed pretreatment facilities shall be prepared and sealed by a professional engineer familiar with such treatment, and registered in the state.
(2) Two copies shall be submitted to the City's Public Works Department, who shall review each submittal and shall be the sole approving authority.
(3) Installation shall be at the user's expense unless the city has been contracted for treating the wastes.
(C) Maintenance and inspection of pretreatment facilities.
(1) Where pretreatment facilities are provided for any industrial waters or wastes, the owner shall maintain them continuously in satisfactory and effective operation, at the owner's expense.
(2) Any such pretreatment facilities may also be subject to inspection by the city.
(D) Grease traps and grease interceptors.
(1) Grease traps and grease interceptors shall be provided by all new and or existing laundries, restaurants, service stations, auto repair shops, car washes and other industrial users when, in the opinion of the city, grease traps or interceptors are necessary.
(2) Generally, no facility shall discharge into the POTW any wastewater containing any fat, mineral, organic oil, grease or any waste that may form persistent oil emulsions more than 25 milligrams per liter by weight, or any sand or flammable wastes.
(3) Such grease traps and grease interceptors shall not be required for domestic users.
(4) Facilities established prior to the execution of this code amendment will have one year, from the execution date of this code, to conform with the requirements to have or install a grease trap or grease interceptor, as deemed necessary by the Director of Public Works, provided they comply with the discharge limitations established herein.
(5) Facilities that cannot meet these standards, however, must install grease traps immediately, or arrange for offsite disposal of their grease.
(6) All grease traps and grease interceptors shall be of a type and capacity approved by the city, and in compliance with the International Plumbing Code, as adopted in Chapter 150 of the City Code of Ordinances, and shall be so located as to be readily and easily accessible for cleaning and inspection.
(7) Grease traps and grease interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature.
(a) They shall be of substantial construction, watertight, and equipped with easily removable covers.
(b) Covers shall be gastight and watertight.
(8) Where installed, all grease traps and grease interceptors shall be maintained by the industrial user, at his or her expense, in efficient operating condition at all times.
(a) The owner shall keep written records and documentation of all cleaning, repair, calibration and maintenance required to demonstrate compliance.
(b) Records shall be kept at the facility for a minimum of three years.
(E) Control manholes.
(1) Where required by the city and to facilitate observation and sampling of wastes, the owner of any property served by a building sewer carrying industrial wastes shall install a suitable control manhole in the building sewer.
(2) When required, the manhole shall be accessible and safely located, and shall be constructed in accordance with plans approved by the city.
(3) The manhole shall be installed by the owner at the owner's expense, and shall be maintained by the owner so as to be safe and accessible at all times.
(Ord. 1152, passed 11-14-02)