Landfill Cell CQA

ARM’s Construction-Phase Services Group has provided an array of construction quality assurance (CQA) activities for a numerous clients in our region. At Prince Edward County Sanitary Landfill near Farmville, Virginia, ARM was asked to provide construction oversight and quality assurance during the geosynthetics installation over a recently constructed 3.5-acre cell.

ARM was tasked with a multitude of responsibilities during geosynthetics installation, all of which were aimed at ensuring the construction effort was being performed in a safe, effective, compliant manner.  ARM offered valuable insight during pre-project meetings and daily safety gatherings to commonly encountered geosynthetics issues, as well as to anticipated site specific obstacles.  This provided a platform of discussion between the client, contractors, and engineers to develop solutions to these issues prior to being encountered in the field, thus maintaining project efficiency and preventing costly delays.

The design engineer utilized a geosynthetics profile that incorporated a geosynthetic clay liner (GCL), a 60-mil double sided textured HDPE geomembrane, and 10 oz/sy nonwoven cushion geotextile.  GCL deployment can be cumbersome due to the weight of the material, small roll lengths, and the need for additional bentonite placement.  GCL can also be rendered unusable when subject to precipitation during installation.  With these factors in mind, ARM coordinated with the earthwork and geosynthetics contractors to ensure that adequate subbase preparation had taken place, proper deployment techniques were employed, and the necessary GCL coverage was available prior to impending precipitation.  During HDPE geomembrane installation, ARM was assigned with documenting the installation procedures, and confirming that all activity complied with the specifications found in the agreed upon CQA Plan.  ARM verified that geomembrane deployment and welding procedures, trial weld and destructive seam testing values, non-destructive air pressure and vacuum testing results, and geotextile deployment and welding methods were acceptable to all parties involved.

ARM communicated daily with on site personnel and project managers to ensure that all interested parties were knowledgeable of site activity, installation progress, and updated schedules. Following successful geosynthetics installation, ARM prepared comprehensive logs detailing the subbase approval, material deployments, and destructive & nondestructive testing procedures.  These logs were submitted to the client for use in the final certification permitting required by the state of Virginia, and the cell was certified for use later that year.