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Filtered quartz sand for the first use

Oct 03, 2020 Chapter 26 Gradation Design of Sand and Gravel Filters. 633.2601 Basic purpose of filters and drains. Filters are placed in embankment zones foundations or other areas of hydraulic structures for two pur-poses: • To intercept water flowing through cracks or openings in a base soil and block the movement of eroding soil particles into the

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