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When constructing a new dam (or remediating an existing one) it is important to ensure that water does not flow below the foundation of the dam If it does, then a barrier must be constructed There are different techniques to create such barriers, and one of the most sophisticated, is the construction of a plastic diaphragm (slurry) wall. The first step to build the wall, is to create what is called a concrete amp;quot;guide wallamp;quot; along the axis of the dam Then, excavation begins with a grab to remove the soils from the top, until a pre-determined depth is docHubed, or until the limit of the tool (normally 70 SPT). Grabs are effective to dig through soils such as clays, silts or sands. The hydraulic grab has verticality sensors and flaps on its body to ensure that the excavation is vertical While digging, bentonite slurry (or mud) is inserted at the top, so that the excavation does not collapse The panel being excavated is called a amp;quot;primaryamp;quot; panel. At this poi