The construction planning documents stipulated that only river sand, not ocean sand, could be used for the concrete. What ’ s more, heat drying and testing to confirm a low moisture content were also required before the sand could be used to make concrete.
羅時瑋舉例說，當年的施工圖規定沙子只能選用河沙，不能用海沙，且須先用鍋子炒過、確定沒有多餘水分後，才能用來調製混凝土。