 |
Oklahoma Administrative Code (Last Updated: March 11, 2021) |
 |
TITLE 252. Department of Environmental Quality |
|
Chapter 517. Disposal of Coal Combustion Residuals from Electric Utilities |
|
Subchapter 13. Operational Requirements |
SECTION 252:517-13-7. Leachate collection and management for CCR Landfills
Latest version.
- (1) Plan. In the event the leachate collection system fails to perform as designed, and approved by the DEQ, a corrective action plan shall be submitted to the DEQ within 30 days from the discovery of the failure.(2) Implementation. The corrective action plan shall be implemented within 30 days of DEQ approval.(b) Cleanout and maintenance of the leachate collection system.(1) Frequency. The leachate collection header pipes shall be cleaned out after placement of the protective layer, again after placement of the first lift of waste, and once per year thereafter.(2) Routine inspections. The leachate collection system shall be inspected at least quarterly to ensure proper operation.(c) Leachate management. Leachate shall be managed in accordance with a plan approved by DEQ in one or more of the methods identified in this Section and in a manner that will not cause contamination.(1) Storage.(A) Above-ground tanks. Above-ground storage tanks used to store leachate shall be equipped with:(i) adequate berming to contain the entire contents of the largest tank in the system; and either a composite liner made of two feet (2') of recompacted clay with the hydraulic conductivity of 1.0 x 10-7 cm/sec overlain by a 60 mil HDPE liner; or(ii) a DEQ approved alternative liner that will prevent infiltration of fluid.(B) Underground tanks. Underground tanks used to store leachate shall be constructed in accordance with the Oklahoma Corporation Commission's General Requirements for Underground Storage Tank Systems, OAC 165-25, Subchapter 1, Part 8.(C) Surface impoundments. A surface impoundment used to store leachate shall have a composite liner constructed in accordance with the liner requirements of this Section.(i) Run-on control. Surface water run-on control measures shall be provided.(ii) Freeboard. A minimum three feet of freeboard shall be maintained.(2) POTW.(A) POTW approval required. Leachate may be discharged from the disposal facility into a POTW provided prior written approval from the POTW has been obtained.(B) Additional requirements. Such discharges shall comply with any additional requirements of the POTW.(C) Recordkeeping. A copy of the POTW approval shall be placed in the operating record.(3) Oklahoma Pollutant Discharge Elimination System (OPDES).(A) Permit required. Leachate may be discharged from the disposal facility provided an OPDES permit from the Water Quality Division of the DEQ has been obtained for such discharge.(B) Copy of permit. A copy of the OPDES permit shall be maintained in the operating record.(C) Comply with permit. Such discharges shall comply with the provisions of the OPDES permit.(4) Other. Plans for alternative methods of leachate management may be approved by the DEQ.