Design of 4 km long peripheral offshore bulkheads of RC caisson type and hybrid caisson type for rapid and mass reclamation works by use of mud barges in Naoetsu Port, Niigata, Japan. Other services provided by JPC include hydraulic model tests on waves overtopping the bulkheads, design of mud loading jetty with truss structures, execution plan of bulkhead construction and reclamation works, and construction supervision. Volume of mud carried by barges reached 40,000 cu.m. per day, and total reclamation volume 9,550,000 cu.m. in 3 years.