U. S. National Park Service
Ocracoke Island, NC
SCOPE OF WORK: The National Park Service required the replacement of the public-use boat ramps located on the south end of Ocracoke Island, North Carolina, which had deteriorated significantly since their construction circa 1960. This design-build project was accomplished in two phases. Phase 1 consisted of designing an acceptable means and method to demolish and remove the two existing, aged concrete boat ramps, while retaining the existing bulkhead and finger piers on each side.
Phase 2 consisted of the demolition and construction portion of the project after the design was approved. The PCG team installed a sheet pile cofferdam to allow dewatering for excavation, installation of the new base, and placement of the new concrete boat ramps. The new ramps feature grooved surfaces, lower wheel-stops, and a steeper grade to be optimal for modern boats and trailers, with a slope of 13% to 14%. The reinforced concrete ramp slabs contain a corrosion inhibitor additive in the mix design, along with epoxy-coated reinforcing.