Biggars Lane Landfill

SSP&A developed analyses to predict the evolution of the concentration of chloride at a compliance boundary downgradient from an existing landfill and proposed new landfill cells.

Analyses were developed for two alternative designs for landfill extensions. The reporting included a rationale for selecting chloride and its Reasonable Use Performance Objective (RUPO). SSP&A developed simplified models to support the analyses and to estimate the maximum infiltration rates through the final landfill covers for which the predicted peak chloride concentration at the compliance boundary would remain below the RUPO. Analytical solutions were developed to check the results inferred from the numerical modeling.

SSP&A was responsible for:

• Development of solute transport models for the existing landfill and two alternative landfill designs.
• Selection of chloride RUPO concentrations for the analysis.
• Innovative analyses of solute transport from a source with finite leachable mass.