For the remediation-focused site investigation professional, we believe that hydraulic permeability is no longer an option, but a requirement. As this post will outline, hydraulic permeability is key to identifying contaminant transport zones at LNAPL and DNAPL sites for remediation-focused site investigations. Hydraulic permeability data, which is collected with a Hydraulic Profiling Tool (HPT), enables decision makers to understand contaminant mobility and migration. Today, responsible parties and involved stakeholders are looking for more than just lab results from samples and screened well intervals, and are instead looking for data which enables them to minimize risk, reduce costs, and enhance remediation design efforts.
Below is an example of an HPT log from a site with multiple contaminants at concentrations up to and including NAPL. The combined Membrane Interface Probe-Hydraulic Profiling Tool (MiHpt) was used to delineate the horizontal and vertical extent of contamination and collect hydraulic permeability data simultaneously.
Key takeaways from the log included above: