In April 2006, Structural Preservation Systems (SPS) was retained to install a soil-mix secant wall in Chinatown on Chrystie Street near the Manhattan Bridge in New York City. The wall was installed for lateral support during a 30-foot excavation for construction of a hotel with a subcellar parking lot. The soil-mixing method implemented a 14-inch diameter reamer bit that spun while cement was injected out of small ports on its side, mixing the soil and sand with the cement on the way down as it drilled the hole. The soil-mix elements were drilled to 32 feet with the exception of every third element that was drilled to 40 feet with 9-5/8 inch steel casing inserted in the middle to provide reinforcement and facilitate whaler and strut connections.

In addition to the soil-mix secant wall, SPS installed tiebacks using grout-through self-drilling titan bar and performed permeation grouting with microfine cement below the adjacent buildings. The work was performed over a long period of time and consisted of numerous mobilizations and various drill rigs to accommodate the changing site conditions due to the complicated excavation sequence.