Project Summary A dditional facilities were planned for construction at the East Central Regional Waste Water Treatment Plant (WWTP). As part of the addi- tions, two below grade pumps were to be added to the existing Effluent Pump Station. Problem Sheetpiling had been installed to facilitate the excavation and the tie-in to an existing 54-inch diameter header pipe. As the general contractor exposed the header pipe, the excavation flooded as water

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