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- Leachate-Holding Tank. ERL will ensure that the existing and proposed leachate- • <br />holding tanks are pumped out on a regular schedule. Leachate will not be allowed to <br />collect on the liner to a depth exceeding one foot due to the leachate-holding tank <br />being full. An additional leachate-holding tank with a minimum 150,000-gallon <br />capacity will be added to the system. <br />- Leachate Recirculation. Remedies for problems arising from leachate recirculation <br />include, but are not limited to, the cessation of leachate recirculation and reverting <br />back to traditional leachate treatment. <br />- On-site Groundwater. ERL will perform on-site water quality testing at the monitoring <br />wells in the manner required by the MPCA permit. The wells shall meet current <br />Department of Health Well Code Standards. The Water Quality Report shall be <br />submitted to the City when it is submitted to the MPCA. <br />- Surface Water Ouality. ERL will have surface water quality tests performed in <br />conjunction with sampling events when water is present as may be required by the <br />MPCA permit. <br />- Off-Site Groundwater Oualitv. ERL will annually sample the individual private wells <br />identified in the Phase IV Water Quality Monitoring Work Plan required by Section <br />4(05) of the approved CUP. All private wells shall be analyzed for pH, COD, <br />ammonia, chlorides, specific conductance, and volatile organic compounds (MDH <br />method 465C and EPA method 601, 602). <br />- Phase IV Water Quality Monitoring Work Plan. The Phase IV Water Quality <br />Monitoring Work Plan which describes the sampling frequency, parameters, protocols <br />and reporting frequency for Landfill gas, leachate, leachate piezometers, leachate, <br />lysimeter, residential wells, groundwater monitoring wells and surface water will be <br />updated annually to reflect changes in the monitoring systems. <br />- Gas Venting System. ERL shall conduct active Landfill gas collection in accordance <br />with approved plans and shall construct additional phases of the gas system at the • <br />time of final cover construction. <br />- Annual Gas Vent System Assessment. Annually assess the effectiveness of active <br />Landfill gas collection operations based on the results of groundwater and Landfill <br />gas monitoring. Incorporate the evaluation in the MPCA Annual Report for the <br />Landfill. <br />- Heavy Metal Contaminant Monitoring and Assessment. Heavy metal contaminants for <br />surface water and groundwater must be addressed in addition to VOC contaminants. <br />Based on the need for additional monitoring to confirm exceedances and identify <br />trends, the Landfill shall continue monitoring and prepare evaluation reports which <br />shall be submitted with the MPCA Annual Reports. <br />- Heavy Metal Contamination Feasibility Study. If heavy metal concentrations in <br />groundwater and surface water exceed regulatory standards, the Landfill will be <br />required to conduct a Feasibility Study and submit it to City staff on schedule <br />determined by City staff. <br />- Hvdroaeoloaic Reports. The investigation of the hydrological and geophysical <br />characteristics of the site will be continued and any other new information relating to <br />the hydrogeologic impact of the site will be reported to the City. Hydrogeologic <br />reports will be updated, amended, and modified as warranted by newly discovered or <br />additional data acquired in the continued hydrogeologic investigation. ERL will notify <br />City at least two (2) days in advance of any soil boring or well construction required. <br />s <br />Elk River Landfill SDA ~ Section 4-4 <br />Land Use Application «~~, ~ ,.o.. ~, Bonestroo ~Wencl< <br />