FORMER KINSTON MGP SITE
Coffer Dam
Kinston, NC
November 2013 to May 2015
$6 M
Zero OSHA Recordables
Duke Energy (Owner) /Silar Services (Engineer)
NorthStar constructed a 300’ by 100’ by 100’ coffer dam within the Neuse River to facilitate the removal of ~2,400 CY of MGP impacted sediments. NorthStar worked off modular barges using an environmental clamshell bucket to dredge the sediments. The sediments were dewatered on top of the barge. Sediments were then excavated from the transport barge and loaded onto articulating dump trucks for the nearly ½ mile trip to the sediment mixing area. The upland MGP impacted soils and sediments were then blended with cement and slag reagent add mix and stabilized to an average depth of 18-22 feet BGS at >50 psi unconfined compressive strength and 1×10 to the minus 7 permeability was achieved through the stabilization process. Once all of the 62,000 CY of soils/sediments achieved the desired performance criteria the site was capped.
