The agency is dredging sea sand after curbs were put on harvesting river due to environmental concerns.
A note to cabinet by the ministry of urban development said SLLR&DC has already pumped 2.8 million cubic metres of sand into a stockpile at Kerawalapitiya, Muthurajaweka, north of Sri Lanka's capital Colombo.
So far it has sold 1.2 million cubic metres of sand to local and international buyers. It was in negotiations to export sand. In addition a contractor building an expressway from the international airport in Katunayaka to Colombo has asked for 1.75 million cubic metres of sand for embankment filling.