Army Engineer Waterways Experiment Station:(l) the design and placement of grout mixtures used in grouting satellite holes surrounding the anticipated trench, (2) the design and supervision of the placement of a concrete mixture used in lining the walls of each of the shot cavities, (3) the design and supervision of the placement of a concrete mixture used in stemming the access holes to each of the shot cavities, (4) the design of the stem configuration for each of the five shot holes, and (5) postshot evaluation of stem design and survey of stem ejecta.
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