Pier 6 Replacement Terracon was retained by American Bridge Company to provide geotechnical engineering and construction materials testing services for the project which consisted of the demolition of three existing piers and the construction of a new submarine pier. The original geotechnical evaluation for the project, which was completed by others, was based on subsurface explorations completed only on land. Terracon performed suplemental subsurface explorations in the area of the new pier by utilizing drill rigs placed on barges. Terracon worked with the Navy to modify design parameters to match the conditions encountered. Terracon also monitored the installation of over 120 drilled shafts and reviewed reinforcing steel and cast-in-place concrete placements.