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Published on Apr 24, 2015
After defining the boundaries of the excavation, crews start cutting and removing the mass of the excavation for cable trenches in an existing, live 500KV electrical substation.
Clearly visible are the outline cuts and the crew "undermining" the bulk of material to be removed. We undercut here after discovering more clay in the soil; it required more effort to slurry the material, while rock and soil fall more easily into the excavation, to be removed by the vacuum system.