(A)   Pretreatment facilities. Users shall provide wastewater treatment as necessary to comply with this chapter and shall achieve compliance with all categorical pretreatment standards, local limits, and the prohibitions set out in § 57.05(A) of this chapter within the time limitations specified by the EPA, the state, or the director, whichever is more stringent. Any facilities necessary for compliance shall be provided, operated, and maintained at the user's expense. Detailed plans describing such facilities and operating procedures shall be submitted to the director for review, and shall be acceptable to the director before such facilities are constructed. The review of such plans and operating procedures shall in no way relieve the user from the responsibility of modifying such facilities as necessary to produce a discharge acceptable to the city under the provisions of this chapter.
   (B)   Additional pretreatment measures.
      (1)   Whenever deemed necessary, the director may designate users to restrict their discharge during peak flow periods, and that certain wastewater be discharged only into specific sewers, relocate and/or consolidate points of discharge, separate sewage wastestreams from industrial wastestreams, and such other conditions as may be necessary to protect the POTW and determine the user's compliance with the requirements of this chapter.
      (2)   The director may require any person discharging into the POTW to install and maintain, on his/her property and at his/her expense, a suitable storage and flow-control facility to ensure equalization of flow. A wastewater discharge permit may be issued solely for flow equalization.
      (3)   Grease, oil, and sand interceptors shall be provided when, in the opinion of the director, they are necessary for the proper handling of wastewater containing excessive amounts of grease and oil, or sand; except that such interceptors shall not be required for residential users. All interception units shall be of type and capacity approved by the director and shall be so located to be easily accessible for cleaning and inspection. Such interceptors shall be inspected, cleaned, and repaired regularly, as needed, by the user at his/her expense.
      (4)   Users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter.
   (C)   Accidental discharge/slug control plans. At least once every two years, the director shall evaluate whether each significant industrial user needs an accidental discharge/slug control plan. The director may require any user to develop, submit for approval, and implement such a plan. Alternatively, the director may develop such a plan for any user. An accidental discharge/slug control plan shall address, at a minimum, the following:
      (1)   Description of discharge practices, including nonroutine batch discharges;
      (2)   Description of stored chemicals;
      (3)   Procedures for immediately notifying the director of any accidental or slug discharge, as required by § 57.09(F) of this chapter; and
      (4)   Procedures to prevent adverse impact from any accidental or slug discharge. Such procedures shall include, but not be limited to, inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants, including solvents, and/or measures and equipment for emergency response.
   (D)   Hauled wastewater.
      (1)   Septic tank waste may be introduced into the POTW only at locations designated by the director, and at such times as are established by the director. Such waste shall not violate § 57.05 of this chapter or any other requirements established by the city. The director may require septic tank waste haulers to obtain wastewater discharge permits.
      (2)   The director shall require haulers of industrial waste to obtain wastewater discharge permits. The director may require generators of hauled industrial waste to obtain wastewater discharge permits. The director also may prohibit the disposal of hauled industrial waste. The discharge of hauled industrial waste is subject to all other requirements of this chapter.
      (3)   Industrial waste haulers may discharge loads only at locations designated by the director. No load may be discharged without prior consent of the director. The director may collect samples of each hauled load to ensure compliance with applicable standards. The director may require the industrial waste hauler to provide a waste analysis of any load prior to discharge.
      (4)   Industrial waste haulers must provide a waste-tracking form for every load. This form shall include, at a minimum, the name and address of the industrial waste hauler, permit number, truck identification, names and addresses of sources of waste, and volume and characteristics of waste. The form shall identify the type of industry, known or suspected waste constituents, and whether any wastes are RCRA hazardous wastes.
   (E)   Requirements for dental facilities that remove or place amalgam fillings.
      (1)   For the purposes of this section following words and phrases shall be as defined as follows:
         AMALGAM SEPARATOR. A device that employs filtration, settlement, centrifugation, or ion exchange to remove amalgam and its metal constituents from a dental office vacuum system before it discharges to the sewer.
         AMALGAM WASTE shall mean and include non-contact amalgam (amalgam scrap that has not been in contact with the patient); contact amalgam (including but not limited to extracted teeth containing amalgam); amalgam sludge captured by chairside traps, vacuum pump filters, screens, and other amalgam trapping devices; used amalgam capsules; and leaking or unusable amalgam capsules.
         ANSI/ADA STANDARD NO. 108. The American National Standards Institute and American Dentistry association standard for amalgam separators.
         EXISTING SOURCE. Any facility subject to this section whose first discharge to the sewer collection system occurred on or before July 14, 2017.
         ISO 11143. The International Organization for Standardization's standard for amalgam separators.
         NEW SOURCE. Any facility subject to this section whose first discharge to the sewer system occurs after July 14, 2017 and must comply immediately upon commencement of discharge.
      (2)   All owners and operators of dental facilities that remove or place amalgam fillings shall comply with the following reporting and waste management practices:
         (a)   For existing sources, the One-Time Compliance Report is due no later than October 12, 2020 or no later than 90 days after transfer of ownership.
         (b)   For new sources, the One-Time Compliance Report is due within 90 days of the start of discharge to the sewer collection system.
         (c)   No person shall rinse chairside traps, vacuum screens, or amalgam separators equipment in a sink or other connection to the sanitary sewer.
         (d)   Owners and operators of dental facilities shall ensure that all staff who handle amalgam waste are trained in the proper handling, management and disposal of mercury-containing material and fixer- containing solutions and shall maintain training records that shall be available for inspection by the Director or designee during normal business hours.
         (e)   Amalgam waste shall be stored and managed in accordance with the instructions of the recycler or hauler of such materials.
         (f)   Bleach and other chlorine-containing disinfectants shall not be used to disinfect the vacuum line system.
         (g)   The use of bulk mercury is prohibited. Only pre-capsulated dental amalgam is permitted.
      (3)   All owners or operators of dental vacuum suction systems, except as set forth in subsections (4) and (5) of this section. shall comply with the following:
         (a)   An ISO 11143 or ANSI/ADA Standard No. 108 certified amalgam separator or equivalent device shall be installed for each dental vacuum suction system on or before July 14, 2020: provided, however, that all dental facilities that are newly constructed on and after the effective date of this ordinance shall include an installed ISO 11143 or ANSI/ADA Standard No. 108 certified amalgam separator device. The installed device must be ISO 11143 or ANSI/ADA Standard No. 108 certified as capable of removing a minimum of 95 percent of amalgam. The amalgam separator system shall be certified at flow rates comparable to the flow rate of the actual vacuum suction system operation. Neither the separator device nor the related plumbing shall include an automatic flow bypass. For facilities that require an amalgam separator that exceeds the practical capacity of ISO 11143 test methodology, a non-certified separator will be accepted, provided that smaller units from the same manufacturer and of the same technology are ISO- certified.
         (b)   Proof of certification and installation records shall be submitted to the Director or designee within 30 days of installation.
         (c)   Amalgam separators shall be maintained in accordance with manufacturer recommendations. Installation, certification, and maintenance records shall be available for immediate inspection upon request therefor by the Director or designee during normal business hours. Records shall be maintained for a minimum of three years.
      (4)   Facilities with vacuum suction systems that meet all of the following conditions may apply to the Director or designee for an exemption to the requirements of subsection (3) above:
         (a)   The system is a dry vacuum pump system with an air-water separator.
         (b)   The sedimentation tank is non-bottom draining, with the drain above the anticipated maximum level of accumulated sludge.
      (c)   Evidence of regular pump outs by a license hauler (a minimum of once a year, or more often if either directed by the manufacturer or necessary to keep solids from exiting through the drain) is maintained and open to inspection by the Director or designee during normal business hours.
         (d)   The system has no direct discharge pipe to the sewer on the bottom of the sedimentation tank.
   An owner or operator whose facility meets conditions (a) through (d) may apply for this exemption by written letter to the Director or designee. The Director or designee will review the system and, if the exemption is approved, shall provide a written letter of exemption. An exemption obtained pursuant to this subsection (4) shall expire upon installation of a new vacuum system. Upon expiration of the exemption, the facility shall comply with subsection (3) above before commencing further operations.
      (5)   Dental dischargers that exclusively practice one or more of the following specialties are not subject to the requirements of this section: (a) Orthodontics; (b) Periodontics; (c) Oral and maxillofacial surgery; (d) Radiology; (e) Oral pathology or oral medicine; and (f) Endodontistry and prosthodonistry.
      (6)   Dental practices that do not place dental amalgam, and do not remove amalgam expect in limited emergency or unplanned, unanticipated circumstances, are exempt from the requirements of this part, provided the dental practice:
         (a)   Submits the following statement to the City, signed by a responsible corporate officer, general partner, proprietor, or a duly authorized representative by the applicable compliance deadlines identified in this § 57.06(E)(2):
   "This facility is a dental discharger subject to this rule and does not place or remove dental amalgam except in limited emergency or unplanned, unanticipated circumstances. I am a responsible corporate officer, a general partner or proprietor (if the facility is a partnership or sole proprietorship), or a duly authorized representative in accordance with the requirements of § 403.12(I) of the above named dental facility, and certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the persons who manage the system, or those persons directly responsible for gathering the information, the information is submitted is, to best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations."
         (b)   Removes dental amalgam for limited emergency or unplanned, unanticipated circumstances, less than nine times per year and as no more than 5% of dental procedures; and
         (c)   The dental practice notifies the City of any changes affecting the applicability of this certification.
      (7)   Disposal of hauled waste from dental facilities to the sanitary sewer is prohibited in accordance with § 57.06(D)(2) of the City's Code of Ordinances.
      (8)   Dental dischargers that fail to comply with this section will be considered significant industrial users, and will be subject to the requirements herein. including the compliance monitoring, reporting requirements, and enforcement remedies identified herein.
(Ord. O-45-99, passed 12-1-99; Am. Ord. O-2020-05, passed 3-20-20)