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Fig. 6. Scanning electron microscopy photography on the upper coarse sand layer grains taken at a magnification of 40. (A) virgin sand sample; (B) sample at a depth of 0.07 m below the surface after 806 d of operation; (C) sample at a depth of 0.02 m below the surface after 806 d of operation; (D) surface sample after 806 d of operation.