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8 <br />management unless and until another remedy for the problem is approved by the <br />City. Leachate recirculation will greatly increase the amount of landfill gas that <br />will be generated from the landfill. The primary concerns relate to landfill gas <br />collection and the prevention of fugitive gas emissions and odors. <br /> <br />(a) Temporary final cover is proposed as an element of the March <br />2012 “Leachate Recirculation Plan. ERL shall implement <br />temporary final cover for cells 15 -20 where practical to reduce the <br />generation of landfill leachate and maximize the collection of <br />landfill gas. <br />(b) ERL shall conduct active landfill gas extraction from liner belly <br />pipe and perforated sections of cleanout risers along a portion of <br />the sideslope. <br />(c) ERL shall identify and document the precise location of seeps. <br />This information is critical in potential problem resolution during <br />later stages of landfill operation and post-closure. The <br />documentation of the seeps must include an approximate <br />coordinate position with an elevation. <br />(d) Leachate head shall not exceed a maximum of 12 inches for any <br />area of the liner. The Landfill shall monitor leachate head levels <br />weekly if leachate recirculation is occurring and monthly during <br />typical operations. The leachate head level data shall be submitted <br />to the City annually. <br />(e) Elk River landfill has submitted a (NOI) Notice of Intent to <br />Recirculate Leachate by surface application on March 31, 2015, <br />which is be incorporated into this license. <br /> <br />(05) Gas Collection and Monitoring System. Licensee shall conduct active <br />landfill gas collection in accordance with approved plans and shall construct <br />additional phases of the active gas control system during site operation and at the <br />time of final cover construction. Optimal gas collection system design and <br />operation is necessary to control and reduce the impact of gas emissions and <br />odors from the Site. <br /> <br />(a) Operation of the Active Gas Collection System shall be managed <br />to mitigate landfill gas migration and ongoing ground water <br />contamination from the unlined portion of the Landfill. <br /> <br />(b) ERL must collect and report landfill gas concentration and <br />pressure for each probe where detectable levels of landfill gas are <br />present. ERL must also collect temperature and barometric <br />pressure for the site at the time of the monitoring event and the two <br />previous 24-hour periods. All gas probe monitoring data must be <br />fully evaluated in the annual operating report. <br />