A new health sciences building being constructed in Chicago as a joint venture of Northwestern Memorial Hospital and Northwestern University will provide a critical care pavilion for the hospital and a dental teaching clinic and cancer research facility for the university. Slurry wall construction is particularly effective under some circumstances. This method of foundation construction neatly circumvents several kinds of special problems, such as where there is limited access to the site in congested area, where it is desirable to avoid the cost of underpinning adjacent structures, where construction activities cannot be permitted to interrupt traffic ro where subsurface impediments prevent using conventional piling and trenching. Wall construction by the slurry technique generally lowers the level of noise, permits leaving temporary gaps in the wall below grade for relocating utilities, makes it possible to build walls to depths of as much as 400 feet and allows having to lower the water table. The main steps include: digging a wide trench as long as one wall panel to a depth of about 5 feet, lining it with concrete guide walls and filling it with a bentonite slurry; placing steel pipe or wide-flange beams at the ends of the trench to form construction joints and then lowering a reinforcing steel cage into the trench while it is still filled with slurry; placing concrete by tremie while pumping the displaced slurry out of the trench to a storage pond or tank or into the next section of trench being excavated; curing the concrete in the soil; and excavating within the wall boundaries and tying the wall to rock anchors or tiebacks.