Construction of foundations by the slurry wall method offers advantages on projects where any of the following conditions obtain: access is limited in congested downtown area; little or no interruption of vehicular traffic by construction activities can be allowed; conventional puling and trenching cannot be used because of obstacles below the surface; a structurally efficient wall with few joints is needed; or a persistently high water table cannot be lowered far enough for conventional basement wall construction. The method offers a ready way of building watertight walls that are useful for underground floors used for garages, offices, or even vaults. It has been in use in Italy since the early 1950's, was introduced into North America in the 1960's and is now finding widening application here. The method involves these basic steps: (1) a wide trench of the limited length of one wall panel is excavated to a depth of about five feet and lined with concrete guide walls. A machine continues the excavation of the trench within the guide walls to the full depth required while a bentonite slurry is pumped into it to prevent caving and to exclude water from the wall cavity. (2) Cages of reinforcing steel built to design specifications are set into the slurry filled cavity. Steel pipe or wide flange beams are used to form joints at the ends of the trench. (3) Concrete is placed by tremie, displacing the bentonite slurry, which is pumped to storage or to the next section of trench. (4) The concrete cures in the soil. The area bounded by the walls is excavated. During excavation, rock anchors or tiebacks are set to support the walls and provide freedom of movement within the excavated area by eliminating the need for interior bracing.