(A) Discharge of certain materials to sanitary sewer prohibited. No person shall discharge or cause to be discharged any storm water, surface water, ground water, roof runoff or sub-surface drainage to any sanitary sewer.
(B) Discharge of storm water, roof runoff and unpolluted drainage. Storm water and all other unpolluted drainage shall be discharged to the sewers as are specifically designated as storm sewers, or to a natural outlet approved by the Director.
(C) Structures required. Discharge of fats, oils or greases of animal or vegetable origin in concentrations greater than 50 mg/l are prohibited. Therefore:
(1) Grease, oil and/or sand interceptors shall be required for any new or remodeled facilities from which there is reasonable expectation that these pollutants will be discharged in volume greater than from residential dwelling units. All interceptors shall be of a type and capacity approved by the Codes Director and shall be located as to be readily and easily accessible for cleaning and inspection. Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, water-tight and equipped with easily removable, gas-tight and water-tight covers.
(2) Where installed, all grease, oil and sand interceptors shall be maintained by the owner, at his or her expense, in continuously efficient operation at all times.
(3) (a) The discharge into the public sewers of any waters or wastes having:
1. A five-day biochemical oxygen demand greater than 300 parts per million; or
2. Containing more than 250 parts per million of suspended solids, shall be subject to the review and approval of the Director.
(b) When the Director makes a determination that it is necessary, the owner shall provide, at his or her expense, the preliminary treatment as required herein.
(4) (a) Storage tanks. In order to promote equalization of flows, any user discharging more than 100,000 gallon per day to the city sewer may be required by the Director to construct and maintain, at his or her own expense, a suitable storage tank, reservoir or pond of the corresponding minimum volumes:
Volume of Waste Discharged Minimum Volume of Storage Tank | Average Gallons/day (Discharged) in Percentage of Daily Volume of Discharged |
0 to 100,000 | 0% |
100,001 to 200,000 | 50% |
200,001 to 400,000 | 100% |
400,001 to 750,000 | 150% |
750,001 or above | 200% |
(b) The storage tank shall have its outlet to the sewer controlled by an approved device, the setting of flow rates being as directed by Director.
(5) Plans for the construction of the storage tank, interceptors and controlling devices shall be approved by the Director prior to the beginning of construction.
(D) Wavier of requirements; approval; certificate; review; revocation. In the event that any new sewer user is unable to comply with any provision contained in this subchapter, whether because of the physical location of his or her premises, the nature of his or her operations, conditions beyond his or her control, or circumstances which would render compliance unreasonable, or impractical, or would result in an arbitrary and unreasonable taking of property, or in the closing and elimination of any lawful business occupation or activity, he or she may apply to the Director for a certificate of waiver, specifying the requirement sought to be waived and the reason underlying the request. Upon receipt of the request, the Director shall examine the premises and operations in question to determine whether adequate justification exists. If good cause is shown, the Director may thereafter issue a certificate of waiver which sets forth the findings of fact as determined by the Director with respect to the request, the grounds upon which the certificate is based, and the specific conditions and restrictions to which the continued validity of the certificate are subject, including without limitations, the payment by the requesting party of the additional charges as are necessary, in the determination of the Director, to compensate for the excess burden on the sewer system occasioned by the waiver. The certificate of waiver may be conditioned upon periodic review of the grounds upon which it is based, and any certificate shall be revocable by the Director for good cause at any time upon 90 days notice to the party who has been granted the waiver. Nothing in this section shall be construed to modify or affect the application hereof as to the requesting party. The Director shall maintain publicly at his or her office a file containing copies of all current certificates of waiver issued.
(E) Prohibited discharge standards.
(1) No user shall contribute or cause to be contributed, directly or indirectly, any pollutant or wastewater which will interfere with the operation or performance of the POTW. These general prohibitions apply to all users of a POTW whether or not the user is subject to national categorical pretreatment standards or any other national, state or local pretreatment standard or requirement.
(2) No user may contribute the following substances to the POTW:
(a) Solid or viscous substances which may cause obstruction to the flow in a sewer or other interference with the operation of the POTW but in no case solids with particles greater than one-half inch in any dimension;
(b) Petroleum oil, non-biodegradable cutting oil or products of mineral oil origin in amounts that will cause interference or pass through;
(c) Any wastewater containing pollutants, including oxygen-demanding pollutants, in sufficient quantity, either singly or by interaction with other pollutants, to cause interference with the POTW;
(d) Any noxious or malodorous liquids, gases or solids which either singly or by interaction with other wastes are sufficient to create a public nuisance or hazard to life, or are sufficient to prevent entry into the sewers for maintenance and repair;
(e) Any wastewater having a temperature greater than 131°F (55°C), or which will inhibit biological activity in the POTW treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104°F (40°C);
(f) Any pollutants which result in the presence of toxic gases, vapors or fumes within the POTW in a quantity that may cause worker health and/or safety problems;
(g) Any trucked or hauled pollutants, except at discharge points designated by the POTW Director, and as covered in § 53.116;
(h) Any substance which may cause the POTWs effluent or any other product of the POTW such as residues, sludges or scums, to be unsuitable for reclamation and reuse or to interfere with the reclamation process. In no case shall a substance discharged to the POTW cause the POTW to be in non-compliance with any state or federal regulation or guideline;
(i) Any wastewater which imparts color which causes the treatment plant effluent to violate the NPDES permit limit for color, if applicable;
(j) Any wastewater containing any radioactive wastes or isotopes, except as specifically approved by the POTW Director in compliance with applicable state or federal regulations;
(k) Any medical wastes, except as specifically authorized by a wastewater discharge permit; and
(l) Recognizable portions of human or animal anatomy.
(3) When the Director determines that a user(s) is contributing to the POTW, any of the above enumerated substances in amounts as may cause or contribute to interference of POTW operation, pass through or cause violation of agreement with other governmental units, the Director shall:
(a) Advise the user(s) of the potential impact of the contribution on the POTW in accordance herewith; and
(b) Take appropriate actions in accordance with § 53.147 for the user to protect the POTW from interference or pass through.
(Ord. 01-19, passed 3-27-2001)