PRB Wall

General Location: Baltimore, MD

Abscope Installed a Permeable Reactive Barrier (PRB) wall adjacent to the Patapsco River near the inner harbor of Baltimore, MD. The PRB wall was installed to treat both arsenic contamination from a former pesticide manufacturing facility as well as hexavalent chromium residue from dumping operation related to a former manufacturing plant in the Region.

 

Abscope’s responsibilities:

• Drove steel sheet pile with ABI rig to a depth of 45’ below grade to create a cofferdam
• Performed vibration monitoring daily due to the close proximity of an elevated highway
• Excavated contaminated soil to 18’ BG underwater
• Maintain support on the sheeting cell and limited the amount of contaminated water generated
• Loaded soil onto treatment pad and drying boxes for offsite shipment
• Poured a 5’ thick concrete plug underwater to seal the bottom of the excavation and the cell was dewatered to facilitate the PRB wall install
• Installed stainless steel cages after the cell was dewatered and the treatment medial was installed