Vertical impervious wall in coastal waste reclamation facilities takes an important role to separate the waste from the sea. Steel companies and marine contractors developed new technologies to meet the technical standard after the ministry ordinances in 1998. Although performance check for joints of impervious wall, mostly sheet pile wall, is important, it is impossible to check all of these joints. Therefore, the performance check should be replaced by QC/QE through construction control. Objective of this study aims to propose a practical QC/QE method to assure impervious performance. A series of execution data gathered in a real construction was examined to find correlativity between those observed data and impervious performance. Development and proposal for QC/QE method to ensure the impervious performance was attempted based on a study to correlate between performance check for sampled joints and execution record. A method for removal of noise data in consideration of data variation and reducing the data entries in consideration of representative data trend are also examined and proposed. To identify sheet piles overloaded during installation, planar image of those data drawn along the sheet pile wall is useful in QC/QE..