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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 621. Non-Industrial Discharging and Public Water Supply Lagoons |
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Subchapter 9. Closure Requirements and Plans |
SECTION 252:621-9-3. Closure plan content requirements
Latest version.
- At a minimum, the written closure plan shall include the following information, as well as other information requested by the Department:(1) General information. The following general information shall be provided in all closure plans:(A) State the purpose of closure indicating the reason why the lagoon or other facility is no longer in use. State whether the wastewater or biosolids from non-industrial discharging wastewater lagoons or residuals from public water supply lagoons will be removed.(B) Provide the state discharge permit number for the facility, if any.(C) Provide the name, address, and telephone number of all the record owner(s) of the land upon which the lagoon is located.(D) Provide a time schedule indicating the major closure activities, approximate time to complete each activity, and the estimated date of final completion of all closure activities.(E) If the lagoon or disposal system contains or is suspected to contain toxic substances, the closure plan shall include certification by a registered professional engineer.(2) Wastewater, biosolids or residuals characterization. The minimum information about the wastewater, biosolids or residuals specified in this Section shall be included in the closure plan. Additional information may be required. When requested by the Department, provide a chemical analysis of representative sample(s) of the contents of the lagoon(s) or other sanitary wastewater disposal system.(3) Treatment, removal, and disposal. When requested by the Department, the closure plan shall also include the following discussion of treatment, removal, and disposal activities:(A) Treatment. Describe all treatment methods to be used to treat biosolids or residuals from the lagoon (e.g., chemical or physical treatment, waste stabilization, or other method).(B) Removal. Describe all removal activities for all wastes, wastewaters, biosolids or residuals (e.g., volume removed, equipment used, dust control, and other activities).(4) Additional closure requirements. In addition to the other requirements of this Part of Subchapter 9, the following additional requirements apply for closure:(A) Biosolids or residuals disposal requires approval of the Department as specified in OAC 252:606-8, whether the biosolids or residuals are proposed to be removed from the lagoon or are proposed to be left in place.(B) If the average biosolid or residual thickness in the lagoon exceeds six (6) inches, the biosolids or residuals must be removed from the lagoon. Land application will require the approval by the Department of a Sludge Management Plan pursuant to OAC 252:606-8. Disposal of biosolids in a landfill, must meet the requirements of the Solid Waste Management Act and other applicable statutes and rules.(C) If the average biosolid or residual thickness in the lagoon is six (6) inches or less, the Department may or may not require the biosolids or residuals to be removed from the lagoon, and will evaluate proper disposition of the biosolids or residuals and closure requirements for the lagoon on a case by case basis. Such evaluation and any approved closure plan must include consideration of requirements and criteria set forth in applicable rules of the Department relating to biosolids or residuals disposition.