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~/ <br />1 .!~] <br />~' <br />observations for slurry wall installations. For ex,unple, [he policy memo includes no <br />discussion of critical slurry wall installation observations such as trench key confinna[ion <br />and no discussion of imponant slurry wall installation practices such as cleaning of [he [tench <br />bottom to remove sediments. The policy memo is not a guideline to design and permi[ting of <br />slurry wall and pit liner installations. <br /> <br />