Independent third party verification/validation work is one way to ensure that decisions produced by project activities are legally and technically defensible. Independent third party verification can take several different forms. It can simply involve a third party review of data packages and associated QA/QC information to determine that data quality assurance goals have been achieved. It can include split analyses of samples taken during field activities to provide an independent check on analytical quality and analytical method performance. It can include independent data collection in addition to data collected as part of project activities to assess the overall quality of the sampling and analysis process. In all three cases, use of the Triad does not impose any peculiar requirements on third party verification/validation activities, other than the fact that there should be consistency and coordination in comparing data sets that may potentially be based on different analytical methods.