This ZTL is applicable to monitoring colloid mobilization and transport in the vadose zone during rainfall events and during in-situ remediation treatments that require long periods of saturation and significant fluid flux. A series of installed ZTLs could be used to document preferential flow paths or significant contaminant migration. The new type of ZTLs presented here, namely, those installed in vertical holes with replaced undisturbed cores, as described above, was field tested. A prototype of an automated version has been constructed. There are no known regulatory barriers to using this technology.
Regulatory agencies are familiar with conventional designs of zero-tension lysimeters.
Because this design requires less site disturbance during installation, regulatory agencies would be expected to favor its use. Site excavation permits are likely to be required for installation. This ZTL is applicable to monitoring colloid mobilization and solute transport in the vadose zone during rainfall events and during in situ remediation treatments that require long periods of saturation and significant fluid flux. A series of installed ZTLs could be used to document preferential flow paths or significant contaminant migration. The disadvantages of conventional ZTLs are related to the possibility of site disturbance during installation and also the higher costs associated with opening a large pit, so the device can be installed.