Remediation Solution
Remediation Approach
Technology
Media Treated
Industry
Contaminant Type
Contaminant of Concern
Location
A historic arsenic spill contaminated approximately 2,600 cubic yards of marsh peat sediment and railroad sand ballast in Northeast Wisconsin. Treatment was required across two distinct soil types within a sensitive wetland ecosystem adjacent to a former railroad bed, necessitating both effective contaminant stabilization and full site restoration.
The impacted area was divided into 26 treatment cells of 100 cubic yards each. Excavators thoroughly mixed arsenic-contaminated sediment with hydrogen peroxide (5%), ferric sulfate (70 T), limestone (59 T), and bentonite (120 T). Site restoration included railroad bed reconstruction, topsoil capping, erosion control installation, and native vegetation seeding.
All 26 treatment cells achieved cleanup objectives for both soil types – marsh peat sediment and railroad sand ballast – across the full 2,600 cubic yard treatment volume. The treatment program successfully addressed contamination across two distinct subsurface environments within a sensitive Northeast Wisconsin wetland ecosystem. Following treatment, the site was fully restored: the railroad bed was reconstructed, topsoil was graded over the marsh mixing area to cap it, erosion control features were installed, and the disturbed area was seeded with a native vegetation mixture. The sensitive marsh ecosystem was protected throughout all phases of remediation and restoration.
Superfund ISTR Under Strict Air Emission Limits
Bioremediation for PFAS
High-Profile ISTR of Historic Chemical Disposal Impacts
