Independent forensic hydrogeology review of a large-scale groundwater remediation cost estimate prepared for a former industrial site.

Why This Engagement Mattered

• Cleanup cost estimate exceeded $1.7 billion
• Cost driven primarily by assumed contaminant mass rather than measured conditions
• Required technical scrutiny beyond routine environmental review

Scope of Review

• Examined conceptual site model and historical investigation data
• Reviewed assumptions used to define contaminant extent and mass
• Assessed calculation methods for internal consistency and proper use of site data
• Evaluated remedial assumptions used to convert contaminant mass into projected costs
• Performed independent mass recalculations using defensible hydrogeologic inputs

Technical Focus

• Dense non-aqueous phase liquids (DNAPL)
• Chlorinated solvents and petroleum-related compounds
• Key constituents included PCE, TCE, benzene, chloroform, carbon tetrachloride, and lead-containing compounds

This engagement demonstrates how forensic hydrogeology is used to evaluate the foundation of high-dollar environmental claims by isolating assumptions, calculations, and technical drivers of projected cleanup costs.