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• • <br />I <br />observations for slurry wall installations. For example, the policy memo includes no <br />discussion of critical slurry wall installation observations such as trench key confirmation <br />and no discussion of important slurry wail installation practices such as cleaning of the trench <br />bottom to remove sediments. The policy memo is not a guideline to design and permitting of <br />slurry wall and pit liner installations. <br />