Pete Rapp of Sitech Mid-Atlantic, explains the operation of a locating and positioning device to Will Patterson of TIC, during the installation of a coffer dam along the Savannah River. Sitich supplied the equipment to TIC, a subcontractor on the dissolved oxygen injection system as part of the environmental mitigation for the Savannah Harbor Expansion Project (SHEP). The coffer dam will allow workers from CDM Constructors, the prime contractor for the dissolved oxygen injection system installation, to build the site for a series of Speece cones. These cones will super-oxygenate river water and inject it back into the Savannah River to maintain current levels of dissolved oxygen as the shipping channel is deepened. The U.S. Army Corps of Engineers, Savannah District, oversees the SHEP, including environmental mitigation.