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PURPOSE : Eco soil is provided to ensure various functionality, environment-friendly properties, contamination controllability, and waste recycling function. CONSTITUTION : Eco soil is single soil or composite soil of two or more soils, wherein the soil is selected from the group consisting of sand, gravel, aggregate, rubble, loess, kaolin, clay, granite soil, decomposed granite soil, dredged soil, precipitate soil, deposit soil, constructional residual soil, organic soil, and inorganic soil.