Slurry Or Permeable Reactive Barrier Walls

These types of “Cut Off Walls” are not used for typical earth retention but rather to retain contaminated soils and ground water from moving or flowing past the wall. ERC offers several construction techniques to address the containment of subsurface contaminants. These cut off walls are typically narrow trenches installed to a depth to reach tight clay soils or even competent bedrock depending on jobsite requirements.

Slurry walls use a biopolymer solution of cement-bentonite or soil-bentonite that is pumped into the trench to prevent sidewall failures and water infiltration during excavation. The mixture of cement-bentonite or soil-bentonite depending on the project specifications then cures or hardens and forms a low permeability barrier for groundwater.

Permeable Reactive Barrier Walls (PRB) also referred to as a permeable reactive treatment zone (PRTZ), is recognized as being a cost-effective technology for in situ groundwater remediation. PRBs trenches filled using granular iron filings or other zero valent metals (ZVMs). They serve as barriers which allow some, but not all, materials to pass through. One definition for PRBs is an in situ treatment zone that passively captures a plume of contaminants and removes or breaks down the contaminants, releasing uncontaminated water. The primary removal methods include: (1) sorption and precipitation, (2) chemical reaction, and (3) reactions involving biological mechanisms.

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