Mixed soil composition for intermediate cover materials in a sanitary landfill and preparing method

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The present invention relates to a mixed soil composition uses as an intermediate cover material of a waste landfill and a manufacturing method thereof. The mixed soil composition includes red soil and silt. The red soil is about 5-15% by weight of the total weight of the red soil and slit. The method mixes the soil to make the pH of the soil between 7 and 10.