Could you be more specific as to what you are trying to cutoff, as well as parameters such as depth etc.? If you are just looking for generic info, a Google search on cutoff walls yields a number of contractors who specialize in a wide variety of type of cutoff walls from plastic barriers to slurry walls.
Thanks Ctmtwilliam for your reply. I am looking to contain contain LNAPL (dielectric fluid) at a depth if 10 ft bgs. Is there any alternative for slurrywall like heavy plastic sheet?
I am not an expert on this matter but have looked into it for one of my jobs where we wanted to cutoff groundwater for a deep excavation. We are currently looking at using sheet pile with seals added in between sheets. You can either apply a compound (with a caulk gun type application)as you place sheets into the ground or buy special sheet piles that have a larger than normal opening betwee connections where a grout can be pumped into after placing sheets into the ground.
It is a common design to install vertical HDPE sheet in the slurry trench. As suggested by ctmtwilliams a google search will give you suppliers of proprietary systems and contractors.
