Why This Engagement Mattered

Determination of allocation share for contaminated river sediment required assessment of whether a former manufacturing facility contributed contaminants of concern at levels relevant to financial responsibility. The technical dispute focused on estimation of contaminant mass flux associated with permitted sewer discharges and the accuracy of calculations used within the allocation framework. Routine review did not resolve questions regarding calculation methods, assumptions, and pathway relevance.

Scope of Review

Reviewed historical wastewater discharge data, sediment-related documentation, and the Cost Allocator’s calculation protocol. Evaluated assumptions used to estimate contaminant mass flux from sewer discharges. Performed independent mass flux calculations using conservative, worst-case inputs consistent with the prescribed allocation methodology. Identified mathematical inconsistencies within the Cost Allocator’s protocol.

Technical Focus

River sediment; permitted wastewater discharges; metals including copper, mercury, and lead; contaminant mass flux estimation, transport pathways, and allocation methodology.

Closing Summary

This engagement demonstrates how forensic environmental analysis is applied to test the technical foundations of sediment allocation assessments by independently reconstructing calculations, evaluating assumptions, and assessing plausible transport pathways relevant to allocation determinations.