The Mar-Kit Sanitary Landfill site is an 80-acre municipal solid waste (MSW) facility located in Thompson Township, Kittson County, Minnesota, operating under MPCA Permit SW-92. In December, 2014, Wenck assisted Mar-Kit with the preparation of a Demonstration Research Project (DRP) Application, utilizing an alternative final closure material (ClosureTurfTM) for final closure of MSW Cells 3 – 5. The ClosureTurf™ technology provides a final cover system that is one inch or less in overall thickness. The MPCA granted approval of the DRP in June 2015. This was the first site to be approved and to install ClosureTurfTM in Minnesota.
The ClosureTurf™ technology provides a final cover system that is one inch or less in overall thickness. The MPCA granted approval of the DRP in June 2015. The Mar-Kit Landfill was the first site to be approved and to install ClosureTurfTM in Minnesota. Since ClosureTurf™ provides an artificial turf, rooting zone and topsoil layers are not necessary to support vegetative growth, thereby reducing long term maintenance and erosion while providing an aesthetically pleasing final cover surface designed for stability and longevity. The system consists of a 50-mil Super Grip Net which is a composite liner/drainage product consisting of LLDPE spiked with drainage “studs” on the top surface to provide high capacity drainage, Geotextile with engineered high-density polyethylene (HDPE) turf, and a Sand infill. The sand infill weighs down the Closure TurfTM to prevent uplift due to wind suction forces, while the Hydrobinder is a binder soil placed in the turf that has additional resistance to erosive forces. Hydrobinder is used in channels, swales and other areas where Erosion Control Blanket or Erosion Stabilization Mat would normally be used.
As part of construction, Wenck completed all the construction quality assurance testing on all aspects of the construction, for both the closure and cell construction. Tasks included buffer layer placement, gas vent installation, along with downslope and terrace construction. The Mar-Kit Landfill closure turf was installed in the fall of 2015. In the two years following initial installation, the landfill has experienced increased surface water quality and very limited areas of closure that needed additional repair.
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