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DAM FOUNDATION SEEPAGE CONTROLDAM FOUNDATION SEEPAGE CONTROLDAM FOUNDATION SEEPAGE CONTROL•Depth to top of foundation silt varied from 20 to 70 feet•Groundwater was shallow (< 10 feet deep)•Conventional cutoff trench would be difficult and expensive because of dewatering requirements•Soil-bentonite barrier wall selected••Depth to top of foundation silt varied Depth to top of foundation silt varied from 20 to 70 feetfrom 20 to 70 feet••Groundwater was shallow Groundwater was shallow (< 10 feet deep)(< 10 feet deep)••Conventional cutoff trench would be Conventional cutoff trench would be difficult and expensive because of difficult and expensive because of dewatering requirementsdewatering requirements••SoilSoil--bentonite barrier wall selectedbentonite barrier wall selected