Oak Island’s shoreline has lost 300 feet in a 20-year period. The island is considering levying sand assessments against property owners, costing thousands so the town can finance its nourishment project master plan. (Port City Daily photo/Johanna F. Still) OAK ISLAND — Oak Island property owners may soon be assessed thousands of dollars over a four-year period to pay for a beach nourishment master plan. Over the past few months, Oak Island Town Council has tried to figure out how to split a $40 million cost among its residents. The crucial decision brings about countless questions, including whoâs paying for it, how itâs getting paid for, and whether itâs worth fighting the ocean.