This technique of placing cement foundations and cut-off walls by excavation/slurry placement and displacement with cement has proven extremely effective. However, when problems with the integrity of the wall occur during construction, issues with cracking or "soft" zones and groundwater can be easily addressed by Polyurethane injection. Polyurethanes can seal and bond the structure, returning the effected area to service to or beyond the original specification.

These associated pictures show a project in New York City, for which Ground Freezing techniques were initially used. When this failed Sub-Technical was called in and following extensive application, Polyurethane grouts successfully sealed and secured the problem areas.