BESSBOROUGH LANDFILL CELL 4A CONSTRUCTION

PROJECT PROFILE

KBL was awarded the project based on a combination of price and experience. The site is an existing municipal solid waste landfill.

SCOPE OF WORK

The work to be undertaken generally involves, but is not necessarily limited to, the following:

• Mobilization and demobilization of equipment to site, including construction and remediation of haul roads,
• Prime Contractor role and site safety, and all temporary works and facilities necessary to complete the project.
• Clearing and grubbing of all brush, roots, and stumps from within the grubbing limits and hauling to the appropriate on-site stockpile location as directed by the Engineer.
• Stripping topsoil, subsoil, and any unsuitable material from within the Phase 4A footprint, the access road, surface water ditches, stockpile area, and hauling of material to the on-site stockpiling area as shown on the drawings or as directed by the Engineer.
• Excavation of Phase 4A, including the construction of Phase 4A access roads and fill area, Phase 4A embankments, intermediate berms, access ramps, and stockpiling of excess material.
• Subgrade preparation and surface finishing for an acceptable subgrade across the Phase 4A area for clay liner placement.
• Construction of a 0.75 m minimum thick engineered clay liner within Phase 4A (including slopes).
• Surface finishing of the top of the clay liner.
• Excavation and backfill of the geosynthetic anchor trench as shown on the construction drawings.
• Supply and Installation of the geomembrane liner (14,000m2 of 60mil HDPE liner) Supply and installation of the geotextile layers.
• Supply and Installation of the Phase 4A leachate collection system (including, but not limited to, excavation of trenches, supply and installation of 300mm thick aggregate drainage system, geotextile, and piping).
• Gravelling of the newly constructed Phase 4A access road.
• Construction of the surface water ditches and berms, including supply and placement of all erosion controls.
• Topsoiling and seeding of permanent ditches, embankment slopes, all disturbed areas, and seeding of stockpiles (as indicated on drawings) to aid in erosion control on-site.
• Surveying, as required for the completion of all portions of the Work, which must include a detailed as-built geodetic survey of the entire Work area and all the Work performed, including the base of clay liner and top of clay liner.

PROJECT CHALLENGES

During the project execution, leachate management in the active landfill was needed to prepare for the tie-in work. Elevated leachate levels required additional forces to execute and facilitate a tie in, therefore requiring adjustments to our existing execution plan. KBL constructed additional leachate storage capacity on site to allow for leachate removal in the active cell, facilitating the tie-in.

KBL encountered unsuitable material admixed with waste during cell excavation from historical landfilling operations. The crew monitored excavation and sorted unsuitable material for landfill disposal as needed, ensuring the final product incorporated the most suitable materials for landfill cell construction.

PROJECT SUCCESS

KBL worked closely with the client to ensure operations were able to continue unimpeded during construction. The project was completed to the owner’s satisfaction, with zero injuries or recordable events.