Project Overview

The project involves the excavation and preparation of the subgrade for Cells 7 and 8, followed by the construction of approximately 9.7 acres of a double composite liner system. Key components include the installation of HDPE primary, secondary, groundwater, and conveyance piping with associated accessories, as well as the construction of two sideriser buildings equipped with pumps, meters, and appurtenances. A concrete submersible pump station will be installed, complete with inlet and outlet valve pits, pumps, piping, controls, and related components. The scope also includes expanding the landfill gas (LFG) collection system through drilled vertical wells, horizontal gas collectors, conveyance piping, tie-ins, and condensate traps. Additional work comprises building a perimeter road, installing a temporary sedimentation basin with erosion and sediment controls, and constructing a new scale house along with a second mechanical outbound truck scale.

CHALLENGE

Key challenges included sourcing clay, as no local deposits were available, and managing unexpected rock excavation, which doubled from the original 23,000 CY estimate. Harsh weather added complexity, with work starting in March and continuing through snow to meet the one-year deadline. Additionally, tight coordination with the aggregate supplier was essential to ensure material compliance and maintain the schedule.

SOLUTION

We sourced clay from our own mine an hour away, starting early to prepare for export and coordinating 20 trucks daily to deliver 42,000 CY, later reclaiming the site for farming. For rock excavation, we partnered with the client and engineer to remove double the estimated quantity, overexcavating 10 feet beyond subgrade. Weather delays were minimized through backup plans, enabling steady progress. When aggregates failed spec after stockpiling, we added a washing step before delivery, ensuring compliance for roughly 70,000 tons.

RESULT

Despite major challenges, the project was completed one year ahead of the original two-year schedule and under budget. Efficient clay hauling, collaborative rock removal, proactive weather planning, and quality control for aggregates ensured all specifications were met while exceeding client expectations.