SECTION 98-7 [PRETREATMENT OF WASTEWATER]

(A) Pretreatment Facilities

Users shall provide wastewater treatment as necessary to comply with this ordinance and shall achieve compliance with all categorical pretreatment standards, local limits, and the prohibitions set out in Sec. 98-6 (A) of this ordinance within the time limitations specified by EPA, the State, or CCWA, 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 CCWA for review and approval 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 CCWA under the provisions of this ordinance.

(B) Additional Pretreatment Measures

  1. Whenever deemed necessary, CCWA may require users to restrict their discharge during peak flow periods, designate 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 ordinance.
  2. CCWA may require any person discharging into the POTW to install and maintain, on their property and at their 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. Users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter.
  4. When required by CCWA, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable structure together with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling and measurement of waste by CCWA and it's employees. Such structure when required shall be accessible and safely located and shall be constructed in accordance with plans approved by CCWA. The structure shall be installed by the owner at his own expense and shall be maintained by him so as to be safe and accessible at all times.
  5. Each significant industrial user shall provide protection from accidental discharge of prohibited materials or other substances regulated by this ordinance. Additionally, any user which handles hazardous wastes, any priority pollutant as shown on the EPA list, or any prohibited materials shall, upon request of the Manager, provide proof of protection from accidental discharge of hazardous wastes, priority pollutants or prohibited materials. Facilities to prevent the accidental discharge of prohibited materials shall be provided and maintained at the owner's or user's own cost and expense.

(C) Accidental Discharge/Slug Control Plans

At least once every two (2) years, CCWA shall evaluate whether each significant industrial user needs an accidental discharge/slug control plan. CCWA may require any user to develop, submit for approval, and implement such a plan. Alternatively, CCWA 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 Manager of any accidental or slug discharge, as required by Sec. 98-10 (F) of this ordinance; and
  4. Procedures to prevent adverse impact from any accidental or slug discharge. Such procedures include, but are not 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 CCWA, and at such times as are established by CCWA. Such waste shall not violate Section 98-6 of this ordinance or any other requirements established by CCWA. Septic tank waste haulers are required to obtain wastewater discharge permits.
  2. The Manager shall require haulers of waste to obtain wastewater discharge permits. The Manager may require generators of hauled industrial waste to obtain wastewater discharge permits. The Manager also may prohibit the disposal of hauled industrial waste. The discharge of hauled industrial waste is subject to all other requirements of this ordinance.
  3. Industrial waste haulers may discharge loads only at locations designated by CCWA. No load may be discharged without prior consent of CCWA. CCWA may collect samples of each hauled load to ensure compliance with applicable standards. CCWA 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) Groundwater Remediation Sites

  1. Groundwater remediation site wastewater may be introduced into the POTW only at locations designated by CCWA, and at such times as are established by CCWA. Such waste shall not violate Sec. 98-6 of this ordinance or any other requirements established by CCWA. The Manager shall require groundwater remediation sites to obtain wastewater discharge permits.
  2. CCWA also may prohibit the discharge of groundwater remediation site wastewater. The discharge of groundwater remediation site wastewater is subject to all other requirements of this ordinance.
  3. No wastewater may be discharged without prior consent of CCWA. The Manager may collect samples of the discharge to ensure compliance with applicable standards.

(F) Food Service Facility Grease Management Program

  1. The purpose of this program is to minimize the introduction of fats, oils, and greases into the Clayton County Water Authority (CCWA) wastewater collection system. The main components of the program are the proper sizing, installation, and maintenance of grease interceptors. The administrative and inspection requirements of food service facilities are established herein as well.
  2. General Criteria:
    1. Installation Requirements for New Food Service Facilities - All proposed or remodeled food service facilities inside the CCWA Wastewater Service area shall be required to install an approved, properly operated and maintained grease interceptor. All interceptor units shall be installed outdoors of the Food Service Facility building unless the user can demonstrate to CCWA that an outdoor interceptor would not be feasible. All interceptor units shall of the type and capacity approved by the County and CCWA.
    2. Prohibited Discharges - Domestic Wastewater shall not be discharged to the grease interceptor unless specifically approved, in writing, by CCWA.
    3. Requirements for Existing Food Service Facilities - All existing food service facilities inside the CCWA Wastewater Service area are expected to conduct their operations in such a manner that grease is captured on the user's premises and then properly disposed. Existing Food Service Facilities will be handled under CCWA's Grease Management Program in the following manner:
      1. CCWA will periodically inspect each Food Service Facility on an as-needed basis to assure that each facility is complying with the intent of the Grease Management Program. The as needed inspection shall be determined by the CCWA.
      2. Each Food Service Facility in the vicinity of the problem area will be inspected. The facilities' grease control practices and the adequacy of their grease control interceptor/equipment will be assessed. Maintenance records will also be reviewed.
      3. Following the inspections, CCWA will send written notice to the inspected food service facilities, containing a summary of the policy requirements, and the results of the inspection. The inspections will typically result in one or more of the following actions:
        1. Facilities equipped with an appropriate and adequately sized grease interceptor who are meeting the intent of the Grease Management Program through effective grease control practices will be commended for their compliance.
        2. After notice and an opportunity to be heard facilities not in compliance shall be issued a letter of violation and if such facility fails to achieve compliance it shall be required to develop and submit to CCWA a proposed plan designed to achieve compliance through improved housekeeping and/or increased maintenance and pumping on the existing grease interceptor/equipment
        3. Facilities that are not successful in achieving compliance with the intent of the Grease Management Program through improved housekeeping and increased maintenance and pumping on the existing grease interceptor/equipment will be required to install the necessary interceptor/equipment to bring the facility into compliance
        4. Alteration of an existing grease trap is prohibited by CCWA. If alteration is found, then an approved, properly sized grease interceptor will be required to bring the facility into compliance according to the Grease Management Program.
    4. Waste Minimization Plan - Food Service Facilities shall develop and implement a Waste Minimization Plan pertaining to the disposal of grease, oils, and food particles. Educational materials are available from CCWA Environmental Compliance regarding the minimization of these wastes.
    5. Floor Drains - Only floor drains which discharge or have the potential to discharge grease shall be connected to a grease interceptor.
    6. Location - Each grease interceptor shall be installed and connected so that it is easily accessible for inspection, cleaning, and removal of the intercepted grease at anytime. Grease interceptors required under this ordinance shall be installed outdoors of the food service facility. The best location is in an area outside of an exterior wall, but upstream from the domestic wastewater drain line(s). A grease interceptor may not be installed inside any part of a building unless approved in writing by CCWA. The user bears the burden of demonstrating that an outdoor grease interceptor is not feasible.
  3. Design Criteria:
    1. Construction of Interceptors - Grease interceptors shall be constructed in accordance with the County plumbing standards and outdoor units shall have a minimum of two compartments with fittings designed for grease retention. All alternative grease removal devices or technologies shall be subject to the written approval of CCWA. Such approval shall be based on demonstrated removal efficiencies of the proposed technology.
    2. Access - Outdoor grease interceptors shall be provided with 2 (two) manholes terminating 1-inch above finished grade with cast iron frame and cover. All grease interceptors shall be designed and installed to allow for complete access for inspection and maintenance of inner chamber(s) as well as viewing and sampling of wastewater discharged to the sanitary sewer.
    3. Load-Bearing Capacity - In areas where additional weight loads may exist, the grease interceptor shall be designed to have adequate load-bearing capacity (example: vehicular traffic in parking or driving areas).
    4. Inlet and Outlet Piping - Wastewater discharging to the grease interceptor shall enter only through the inlet pipe of the interceptor. The inlet pipe bottom tee branch shall extend one (1) foot below liquid level. The outlet pipe bottom tee branch shall be submerged to 2/3 of the liquid depth. Each grease interceptor shall have only one inlet and one outlet pipe.
    5. Interceptor Sizing -
      1. Outdoor grease interceptors shall not have a capacity of less than 1,500 gallons nor exceed a capacity of 3,000 gallons. No matter what the calculated capacity using the following formulas, the minimum interceptor size shall be 1,500 gallons. If the calculated capacity using one of the following formulas exceeds 3,000 gallons, then multiple units in series shall be installed. The size of a grease interceptor shall be approximated by the following methods and grease interceptor size shall be the larger of the two results.
        1. Interceptor Capacity (gallons) = (S) x (25) x (Hr/12)
          S = Number of Seats
          Hr = Maximum hours of daily operation (Include preparation and clean up time)
        2. Interceptor Capacity (gallons) = (Sum of fixture flows) x (20)
          Type of Fixture Flow Rate (gpm)
          Restaurant hand sink 15
          Pre-rinse sink 15
          Single-compartment sink 20
          Double-compartment sink 25
          Two double-compartment sinks 35
          Dishwasher up to 30 gallons 15
          Dishwasher up to 50 gallons 25
          Dishwasher up to 100 gallons 40
          Other fixture Manufacturer peak
      2. All under counter or in-line grease interceptors shall not have a capacity of less than 100 lbs. Under-sink or in-line grease interceptor requirements shall meet Plumbing and Drainage Institute Standard PDI-G101:
    Type of Fixture Flow Rate (gpm) Grease Retention Capacity (lbs)
    Restaurant hand sink 15 30
    Pre-rinse sink 15 30
    Single-compartment sink 20 40
    Double-compartment sink 25 50
    Two double-compartment sinks 35 70
    Dishwasher up to 30 gallons 15 30
    Dishwasher up to 50 gallons 25 50
    Dishwasher up to 100 gallons 40 80
    Other fixture Manufacturer peak gpm x 2
    Grease interceptor designs represent minimum standards for normal usage. Installations with heavier usage require more stringent measures for which the user is responsible and shall pay the costs to provide additional measures if required by CCWA. CCWA reserves the right to evaluate interceptor sizing on an individual basis for facilities with special conditions, such as highly variable flows, high levels of grease discharge, or other unusual situations that are not adequately addressed by the formula.
  4. Grease Interceptor Maintenance:
    1. Pumping - All grease interceptors 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 sludges and solids. Decanting or discharging of removed waste back into the interceptor from which the waste was removed or any other grease interceptor, for the purpose of reducing the volume to be disposed, is strictly prohibited.
    2. Pumping Frequency - Outdoor grease interceptors must be pumped out completely a minimum of once every three months. Under-sink or in-line grease interceptors must be pumped/cleaned out completely a minimum of once every month. Grease interceptors may need to be pumped more frequently as needed to prevent carry over of grease into the sanitary sewer collection system. Pumping frequency may be extended past the minimum period if it can be demonstrated by the user and approved by CCWA.
    3. Pump Out Order - When the oil and grease concentrations exceed CCWA's maximum discharge limits and/or the combined depth of bottom and top solids exceeds 25% of the total depth of the trap, CCWA will issue a Pump Out Order to the user. The user shall have seven (7) days from receipt of the order to comply. Where an emergency exists, a written or verbal warning shall be given to the user, and the user will have twenty-four (24) hours to comply.
    4. Disposal of Interceptor Pumped Material - All waste removed from each grease interceptor shall be recorded on a proper manifest form. Also, all waste removed from each grease interceptor must be disposed at a facility approved by CCWA to receive such waste in accordance with the provisions of this program. In no way shall the pumped material be returned to any private or public portion of the sanitary sewer collection system. Responsibility for waste removed from or found in a grease interceptor or waste improperly disposed of shall be placed upon the private company generator food service facility owner.
    5. Additives - Any additive(s) placed into the grease interceptor or building discharge line system on a constant, regular, or scheduled basis shall be reported to CCWA. Such additives shall include, but are not be limited to commercially available bacteria or other additives designed to absorb, consume, or treat fats, oils, and grease. The use of additives shall in no way be considered as an alternative technology or a substitution for maintenance procedures required herein.
    6. Chemical Treatment - Chemical treatments such as drain cleaners, enzymes, acids, and other chemicals designed to dissolve, purge, or remove grease shall not be allowed to enter the grease interceptor.
  5. Administrative Requirements:
    1. Initial Data Acquisition - All food service facilities will be asked to complete a data sheet to establish the grease interceptor database. The CCWA database will be updated with additional or modified information after each yearly inspection.
    2. Administrative Fees - No fee will be charged for an annual inspection by CCWA. However, if the user's grease interceptor is not in compliance with this section, a $200.00 re-inspection fee may be charged for each inspection thereafter until compliance is achieved.
    3. Inspection and Entry - Authorized personnel of CCWA, bearing proper credentials and identification, shall have the right to enter upon all properties subject to this program, at any time and without prior notification, for the purpose of inspection, observation, measurement, sampling, testing or record review, as part of this program.
    4. Record Retention and Reporting - All users must keep a record of any cleaning or maintenance of their grease interceptor. The following records must be kept on-site at the food service facility for a period of three (3) years. Manifests are required for all grease interceptors and shall contain the following information:
      1. Food Service Facility (generator) information, including name, address, volume pumped, date and time of pumping, and generator signature verifying the information;
      2. Transporter information, including company name, address, license plate number, permit number, driver name, and driver signature verifying transporter information; and
      3. Receiving information, including facility name, address, date and time of receiving, EPD permit number, and signature verifying receipt of the waste.
      4. Manifests must be mailed, faxed, or electronically submitted to CCWA Environmental Compliance within fourteen (14) days of interceptor maintenance.
      5. A manifest is required for under-sink or inline grease interceptors.
    5. Enforcement of these regulations shall be in accordance with the provisions of the CCWA Enforcement Response Plan. Failure to comply with this program will be grounds for penalty imposition and/or discontinuance of service. Additionally, failure to comply may result in Health Officer revoking food service permit.

    (G) Oil, Grease, and Grit Interceptors

    Oil, grease, and grit interceptors shall be provided when 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 interceptor units shall be of the type and capacity approved by CCWA.

    1. Requirements:
      1. Any user who discharges a wastewater which contains greater than the quantity of oil and grease regulated in Sec. 98-6 (A)(3)(i); and provided that the excess oil and grease is floatable and can be effectively removed in an oil/grease interceptor, then said user will be required to install an oil/grease interceptor. This includes all facilities that have a potential to discharge petroleum based products to the sanitary sewer such as vehicle maintenance facilities.
      2. All users whose wastewater discharge is associated with large quantities of grit, sand, or gravel shall be required to install a sand interceptor or trap. All car/truck wash systems shall be required to install sand traps.
    2. Design Criteria:
      1. All oil, grease, and grit interceptors used in conjunction with facilities other than food service establishments shall have a capacity that will provide not less than ten (10) minutes nor more than thirty (30) minutes retention time at the peak eight (8) hour flow rate. Flow-through velocities shall not exceed one (1) foot per second at the peak eight (8) hour flow rate. No oil/water separator or sand/grit interceptor shall be smaller than 750 gallons or larger than 3,000 gallons. If the calculated capacity exceeds 3,000 gallons, then multiple units in series shall be installed.
      2. ll oil, grease, and grit interceptors shall have two access ports that will allow for inspection, sampling, and cleaning.
    3. Maintenance:
      1. All oil, grease, and grit interceptors shall be maintained by the user at his expense, and in continuous efficient operation at all times. In the maintaining of these interceptors, the owner shall be responsible for the proper removal and disposal by appropriate means of the captured materials, and shall maintain records of the dates, and means of disposal that are subject to review and inspection by CCWA.
      2. All oil, grease, and grit interceptors shall be pumped out and cleaned, at a minimum annually or when 50% of the retention capacity is filled with oils and/or solids. The frequency of removal may be increased by CCWA or the user to ensure that no overflows of oil, grease, or sand into the wastewater system ever occur.
    4. If the owner contracts for the cleaning, removal, or hauling of collected materials with a currently licensed waste disposal firm, then a manifest must be available from the company hauling the waste away. Under no circumstances shall the collected materials ever be returned to the wastewater system. CCWA may require a user to submit periodic reports about the cleaning, removal, or hauling of collected materials from the separator or interceptor. Such records shall be kept on site for a period of three (3) years and be made available upon request.
    5. An inspection by CCWA may be conducted on all oil, grease, and grit interceptors and shall require the owner to correct any deficiencies immediately at his own expense.

    (H) Garbage Grinders

    CCWA reserves the right to require any user to cease operation of a garbage grinder and permanently remove such equipment as necessary.

    (I) Best Management Practices Plans

    The Manager may require a user to develop and submit for review a Best Management Practices (BMP) Plan to control discharges to the wastewater system. The user shall implement the provisions of the BMP Plan on a timely basis and shall exercise due diligence in pursuit thereof. The BMP Plan shall contain, at a minimum, the following elements:

    1. Purpose and objective(s) of the Plan;
    2. Description of strategies to minimize/prevent the introduction of pollutants into the user's discharge and to minimize waste generation;
    3. Description of best management practices (options) available to the user to control accidental spillage, leaks and drainage;
    4. Description of best available or practicable control technologies available for this specific application;
    5. Description of the overall facility, including site plan;
    6. Description of the waste handling, treatment and discharge disposal facilities, including flow diagrams and process schematics;
    7. Description of operating and maintenance procedures;
    8. Inventory of raw materials and a list of waste sources;
    9. Description of employee training programs, continuing education programs and participation;
    10. Description of documentation, including record keeping and forms;
    11. Description of monitoring activities; and
    12. Information log of facility personnel, organization chart, emergency phone numbers, contact persons and maintenance or service representatives.

    (J) Pollution Prevention Plans

    The Manager may require a user to develop and submit a Pollution Prevention (P2) Plan including an implementation timetable for review. The user shall implement the P2 Plan on a timely basis once each plan has been approved. The P2 Plan shall be developed in accordance with EPA and EPD guidelines, and shall contain the following elements at a minimum:

    1. Description of strategies to minimize/prevent the introduction of pollutants into the user's discharge, and/or housekeeping of oil storage areas;
    2. Description of routine preventive maintenance and schedule of activities;
    3. Description of spill prevention techniques and response procedures;
    4. Description of employee training program and participation in pollution prevention measures, preventive maintenance, response procedures and documentation;
    5. Description of record keeping and reporting protocols, including forms;
    6. Description of the overall facility, including a site plan, process schematics and plumbing diagrams;
    7. Description of waste handling, treatment and discharge facilities, including flow diagrams and process schematics;
    8. List of sources of wastes and locations for their introduction into the discharge;
    9. Inventory of raw materials, chemicals, intermediate products and final products on-site;
    10. Information log of facility personnel, organization chart, emergency phone numbers, contact persons and continuing educational requirements;
    11. Compilation of applicable permits; and
    12. Timetable for implementation of any necessary changes or additions to the user's procedures or facilities.

    (K) Medical Wastes

    1. Hospitals, clinics, medical/dental practitioner offices, convalescent and nursing homes, medical/dental laboratories and funeral homes shall dispose of medical wastes, pathological wastes, laboratory wastes, contaminated medical wastes and wastes from expired humans (corpses) in accordance with the latest edition of guidelines that are published by EPA, the Centers for Disease Control (CDC), the Public Health Department or other appropriate Federal and State agencies.
    2. Toxic, biological or contaminated wastes which are not addressed by the aforementioned guidelines shall not be discharged to the wastewater collection system without written permission from the Manager.
    3. Hospitals, clinics, medical/dental practitioner offices, convalescent and nursing homes, medical/dental laboratories and funeral homes shall prepare and maintain a Biomedical Waste Plan. The Biomedical Waste Plan shall be available for review by the Manager.