Project Experience

Pollution Control Financing Authority of Camden County (PCFA) – Groundwater Remediation at Pennsauken Sanitary Landfill

Environmental forensics leads to simpler and less expensive treatment system

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Cornerstone personnel provided groundwater remediation services for the Pollution Control Financing Authority of Camden County's (PCFA's) 150-acre Pennsauken Sanitary Landfill, located just east of the Delaware River. The work included groundwater flow and solute transport models, a comprehensive groundwater report, application of environmental forensics for fingerprinting of groundwater contamination, and preparation of Remedial Action Work Plans and approval from the New Jersey Department of Environmental Protection (NJDEP) for an in-situ air sparging remedy. An added benefit of the work performed was the settlement of litigation, originally valued at $120 million, for approximately a tenth of the original estimated value. Cornerstone prepared groundwater flow and solute transport models to assess the nature and extent of groundwater contamination and estimated times for restoration to groundwater quality standards, based on planned remediation. Work also included preparation of a comprehensive groundwater report to demonstrate the updated understanding of groundwater flow and contaminant transport, the off-site groundwater plume configuration, and the benefit of a previously constructed low permeability cap. Cornerstone, working with its sister company, Mutch Associates, prepared a detailed analysis of major and minor ions, including iodide and bromide used as tracers of landfill leachate, to define the landfill's impact. Based on these studies, Cornerstone personnel prepared a Revised Remedial Action Work Plan to define an alternative in-situ groundwater remediation approach – a single stage aerobic treatment system. The construction of the groundwater remediation systems is currently underway. Cornerstone is providing construction quality assurance and certification services and will prepare the final Remedial Action Report.

Key Project Activities

  • Three-dimensional groundwater flow and solute transport modeling
  • Evaluation of groundwater-surface water interaction
  • Major and minor ion plots
  • Assessment of landfill remedial action alternatives
  • Preparation of Remedial Action Work Plans
  • Construction quality assurance using the observational method