CCR landfill final cover test pad-Part 1

摘要

An integrated drainage system (IDS) geomembrane, which provides both a low-permeability membrane and drainage space above the geomembrane, is being used in the final cover at a coal combustion residuals (CCR) landfill in West Virginia. Part 1 of this article presents construction in 2016 of the test pad (Figure 1) to evaluate 1-inch (2.5-cm) maximum subgrade protrusions beneath the geomembrane, placement of cover soil with a 9-inch (22.9-cm) maximum particle size using a low ground pressure (LGP) dozer, and the condition of the geosynthetics. Part 2 of this article will present the application of heavy traffic loads over the benched portion of the test pad to evaluate its use as a temporary haul road (in 2016), and additional exhumation of the test pad in 2018. GAI Consultants Inc. (GAI) is the engineer of record for an active landfill located in West Virginia and owned by a North American electric utility company. The landfill is permitted for disposal of fly ash, bottom ash and synthetic gypsum by the West Virginia Department of Environmental Protection (WVDEP). The approximate surface area of the completed landfill will be 192 acres (77.7 ha).