Dearborn CSO Contracts 7 & 8 City of Dearborn, DPW Dearborn, MI Back to Project List Shaft Grouting Program Project Overview: Layne GeoConstruction was selected as the drilling and grouting contractor to perform the pre-excavation grouting program for two 120 ft. diameter x 150 ft. deep shafts as part of the West Dearborn CSO Control Program – Phase B. The pre-excavation grouting program was conducted to reduce the inflow of gas and artesian water into the proposed excavation. The project consisted of two phases of grouting: the soil/rock interface and the underlying bedrock. Grouting methodologies consisted of acrylamide permeation grouting in the contact zone and a combination of acrylamide and traditional balanced cementitious grouting in the underlying bedrock. Real time computer monitoring accompanied all grouting operations. The apparent permeability values recorded in real-time were evaluated, and based on the results, a number of different grout formulations were used for grouting the rock formation and the contact zone. This project is one of the largest acrylamide grouting projects completed in North America. Layne GeoConstruction designed and manufactured a sophisticated acrylamide mixing and placement system to handle the large capacity of the project than can be used in all weather conditions.     Value of Work Performed: Combined Contracts totaling: $14.5M Subcontractor – 90% self performed Award Date: December 2007 Project Start/Finish Dates: February 2008 / October 2008 Project Reference: Geotechnical Consultants: NTH Consultants Holly Rabine & Charles Roarty 313.237.3910 GC: RIC-Man Construction James Bilicki 586.739.5210 GC: Posen Construction Kevin Clarey 586.731.8442