6.2 SR 10-03-2022 - Laserfiche WebLink

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The Landfill also currently samples a network of 14 residential wells located around the Landfill on an annual basis. Monitoring of residential wells will likely be reviewed in the post -closure period. 3.3.2 SURFACE WATER Surface water monitoring is currently conducted at two existing monitoring points during the spring, summer, and fall monitoring events. The monitoring points are located in the Rice Lake wetland complex. During the post -closure period, surface water monitoring will likely either continue to be conducted on a semi-annual basis or switch to annual monitoring. 3.3.3 LEACHATE Leachate is currently monitored in accordance with the MCES and MPCA permits, a City of Elk River Industrial Wastewater Treatment Agreement, as well as the requirements for leachate recirculation (if applicable). The leachate monitoring events are currently conducted quarterly with additional monthly samples collected for compliance with some requirements of the MCES permit for off -site disposal and City of Elk River direct connection disposal. Leachate monitoring is anticipated to follow a similar schedule as long as leachate continues to be hauled or pumped off -site for treatment at a WWTF. 3.3.4 LEAK DETECTION The facility lysimeters are currently monitored three times per year to coincide with water quality monitoring. Leak detection lysimeters are currently located in existing cells 6 through 20. During the postclosure period, lysimeter monitoring will likely be reduced to coincide with other monitoring conducted onsite. 3.4 Surface Water Runoff Control Facilities During post -closure, on -site benches, drainage ditches, swales, downslope structures, downslope piping, and ponds will be inspected at least four times annually, and after major storm events, to determine any need of maintenance. Maintenance associated with sediment accumulations or erosion problems will be performed as needed. Sedimentation ponds will be cleaned as necessary (likely more often shortly after closure, and less frequently towards the end of the post -closure care period). 3.5 Final Cover Surface The final cover surface will be inspected at least four times annually for erosion and settlement. Surface repairs will be performed as needed. Supplemental cover soil will be placed when needed due to erosion and settlement. Seeding, fertilizing, and mulching of bare soil will be provided where required. MPCA will be kept informed of the scheduled repairs. Any and all areas that have been seeded, fertilized and mulched will be inspected quarterly to check for erosion, to make sure that sustained vegetative growth has been established and continues to survive. All erosion ruts or gullies, and general settlement areas of the final cover landfill area will be refilled with suitable earth, graded and reseeded accordingly. BProject Number: 227705133 3.2