Slurry mixing station
The slurry mixing station comprises bulk powder storage silos for the component materials, mixers, wet storage silos, tanks and pumps. The bentonite powder is mixed with water and pumped to storage silos, where it is allowed to fully hydrate.
High-density geomembrane sheets
Where a greater resistance to the movement of gas is required, a high-density polyethylene (HDPE) geomembrane sheet, with a proprietary jointing system, can be incorporated into the cut-off wall.
The HDPE geomembrane sheets arrive on site. They’re premeasured and have interlocking joints welded to the membrane. These sheets are fixed to frames and lowered into the trench, through the slurry. The frames are released and detached from the membrane when a suitable length has been installed.