The remedial action taken is to flush the pipe. Cleaning reduces the contamination levels to an acceptable level. The lines are characterized by the Pipe Explorer and determined to require decontamination. Two thirds of the lines are decontaminated to an acceptable level that requires no further remedial action. The remaining one third of the lines cannot be decontaminated and have to be removed.
Characterization shows that half of the line requires installation of a liner.
Scenario 5 is an active site. The integrity of the drain line is believed to require the installation of a liner. After the Pipe Explorer is used to characterize the line, it is determined that no action is required. A two-man crew is usually mobilized.