Section NR 506.135 - Leachate recirculation(1) GENERAL. Leachate recirculation operations shall comply with the following requirements: (a) Leachate recirculation distribution systems may not discharge leachate within 100 lateral feet of the exterior sideslope final grades, unless otherwise approved by the department in writing.(b) Leachate may not be introduced in areas with less than 20 feet of waste over the leachate collection system.(c) Leachate may not be recirculated in areas that do not have active gas extraction systems installed. The gas extraction systems shall be operated in accordance with the approved leachate recirculation plan to control any additional gas generated by leachate recirculation and minimize release of uncontrolled gas.(d) Leachate recirculation shall be suspended upon discovery of warning symptoms, as identified in the approved leachate recirculation plan. Leachate recirculation may not resume in the area where the problem occurred until changes are made to the system or the warning symptoms have declined to acceptable levels. The operator shall notify the department in writing within 7 days of the discovery of warning symptoms and suspension of leachate recirculation. Alternative notification procedures may be approved by the department in writing.(e) Leachate recirculation shall be suspended whenever any of the failure thresholds identified in the approved leachate recirculation plan are exceeded. Leachate recirculation may not resume until the department has reviewed and approved changes to the system that will result in meeting the thresholds. The operator shall notify the department within 3 days of the discovery of exceeding any failure threshold. Alternative notification procedures may be approved by the department in writing.(f) The operation of the gas extraction system shall be amended as necessary to counteract any increased incidence or intensity of odors.(g) The landfill operator shall maintain in the landfill's written operating record the liquid mass balance for each leachate drainage basin, including leachate extracted, leachate recirculated and precipitation, in all areas where leachate is recirculated, in accordance with the requirements of s. NR 507.215. All warning symptoms, terminations of leachate recirculation and other problems and their solutions shall be recorded.(h) Leachate may not be recirculated where daily or intermediate cover consists of low permeability clay soil or low permeability wastes, unless the daily or intermediate cover is removed or scarified.(i) Measures shall be taken to prevent cold weather freeze up of leachate distribution equipment if used during the winter months.(2) SURFACE APPLICATION. Surface application shall comply with the following requirements in addition to those in sub. (1): (a) Leachate may not be applied in a manner that results in ponding of leachate on the surface.(b) Leachate may not be applied in a manner that allows runoff of leachate beyond the application area.(c) Leachate may not be applied using a spray system or any other distribution system that promotes evaporation of leachate or volatilization of compounds in leachate. Spray systems such as spray bars on the back of a tanker truck may be acceptable if the spray is directed downward.(d) Leachate application shall be limited to the active area of the landfill.(e) Leachate may not be applied during wet or windy conditions that would prevent containment of the leachate to the application area.(f) Truck traffic shall be routed around the application area until the application area is covered to prevent tracking of leachate.(g) Areas of the landfill where leachate has been applied shall be covered with newly placed waste or soil as soon as possible, but in no case later than the end of the same working day that leachate is applied.(3) VERTICAL DISTRIBUTION SYSTEMS. Vertical distribution systems shall comply with the following requirements in addition to those in sub. (1): (a) Gas extraction wells designed independent of the leachate recirculation system shall not be used for leachate distribution.(b) Landfill gas may be extracted through leachate distribution wells to supplement the permanent gas extraction system.(4) HORIZONTAL DISTRIBUTION SYSTEMS. Horizontal distribution systems shall comply with the following requirements in addition to those in sub. (1): (a) Leachate shall not be discharged continuously to individual distribution pipes. Periodic rest periods shall be incorporated into the operating schedule to allow for absorption of leachate into the waste mass and for extraction of landfill gas.(b) Landfill gas may be extracted through leachate distribution pipes to supplement the permanent gas extraction system.(5) ANNUAL REPORTING FOR LEACHATE RECIRCULATION. An annual report shall be submitted to the department by April 30 of each year for leachate recirculation activities occurring during the previous calendar year. The report shall include: (a) The results of the liquid mass balance measurements for each leachate drainage basin.(b) The leachate head levels for each leachate drainage basin.(c) Graphs showing the volumes of leachate extracted and recirculated and precipitation received for each leachate drainage basin.(d) Graphs over the time period since leachate recirculation was initiated, for each parameter required to be sampled in s. NR 507.215.(e) Summary of warning symptoms, terminations, resumptions of leachate recirculation after termination, and any operating problems and resolutions.(f) Documentation drawings or diagrams showing the installed details of the leachate distribution system added or revised since the previous annual report, including but not limited to piping, pumps and distribution media.Wis. Admin. Code Department of Natural Resources NR 506.135
CR 04-077: cr. Register November 2005 No. 599, eff. 12-1-05; CR 06-026: am. (1) (a) to (e) and (h) and (2) (a) to (c) and (e) to (f), Register December 2006 No. 612, eff. 1-1-07.