Korean Airport expansion project uses Nivosonars The 4 square kilometer area to be reclaimed from the sea will serve as expansion space for Seoul Airport after the landfill operation will be completed. The filling material is aggregates, excavated from a sandstone quarry on a hilltop a few hundred meters from the border of the landfill area. The aggregates are transported from the quarry by conveyor belts to the ten groups of Dispensing Plants, e

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