Morris Island LighthouseGeolocation: 32.7766, -79.9309

In order to protect and stabilize the Morris Island Lighthouse, a steel sheet pile cofferdam was designed by the U.S. Army Corps of Engineers. This design consisted of a ring of 46-foot-long PZ-40 sheet piles with a diameter of 72 feet and a protective riprap barrier. In phase one, knowing the vibrations from installation could settle the loose sands and collapse the lighthouse, Terracon engineers instrumented the structure. The Terracon team also created a web-based monitoring system, allowing the owner, design team and contractor 24/7 access to instrumentation results. During phase two, Terracon was responsible for performing soil test borings to depths ranging from 70 - 90 feet. Each of those borings will have an inclinometer installed to monitor ground movement. Instrumentation was also installed to monitor the tilt of the lighthouse. Terracon also designed the grouted mini piles to further stabilize the structure's foundation and conducted the load test monitoring. In addition, the Terracon team is responsible for the monitoring of construction activities and its resulting effects to the lighthouse.

Charleston, SC


Associated Office

Charleston, SCGeolocation: 32.86, -79.9688
Terracon's Charleston, S.C., office was originally known as Wright Padgett Christopher when it was founded in 1993 by William (Bill) Wright, P.E. He was later joined by William (Reg) Christopher, P.E., who eventually became President and CEO. In 2002, the company expanded its geographical area by opening full service environmental, geotechnical, and materials engineering and testing services branches in Myrtle Beach, S.C.; Savannah, Ga.; and Charlotte, N.C. During this transition, the firm became an employee-owned company and the name was changed to WPC, Inc. to better represent its employee…