The Purge Analyzer Tool (PAT) to Assess Optimal Pumping Parameters in the Collection of Representative Groundwater Samples from Wells
The U.S. Geological Survey in cooperation with the U.S. Environmental Protection Agency is developing analytical models to assess in-well groundwater flow conditions during the collection of groundwater samples from wells being pumped. This information can be used to inform groundwater samplers on when and how to collect samples that are most reflective of the targeted aquifer or hydrogeologiic unit.
Methods: In addition to the development of an easy to use analytical VBA code embedded into a spreadsheet file, field data has been collected to help asses the capability of the PAT to simulate in-well groundwater flow. The field data includes the collection of well tracer data to confirm observed travel times in wells that can be compared to simulated travel times in the PAT.
Below are data or web applications associated with this project.
Data associated with the evaluation of the PAT (Purge Analyzer Tool), Stringfellow Superfund site, Jurupa Valley, California, 2017
The concepts behind the PAT analytical program are discussed in the papers.
These papers include a discussion on the rationale for determination of in-well groundwater flow and time of travel, and on the limitations inherent in the program, which is important to ensure proper use.
Evaluation and application of the Purge Analyzer Tool (PAT) to determine in-well flow and purge criteria for sampling monitoring wells at the Stringfellow Superfund site in Jurupa Valley, California, in 2017
Borehole‐scale testing of matrix diffusion for contaminated‐rock aquifers
Instructions for running the analytical code PAT (Purge Analyzer Tool) for computation of in-well time of travel of groundwater under pumping conditions
In-well time-of-travel approach to evaluate optimal purge duration during low-flow sampling of monitoring wells
Hydraulically controlled discrete sampling from open boreholes
Below are software products associated with this project.
Software for the analytical code PAT (Purge Analyzer Tool) for computation of in-well time of travel of groundwater under pumping conditions
Purge Analyzer Tool - For computation of in-well time of travel of groundwater under pumping conditions.
Below are partners associated with this project.
The U.S. Geological Survey in cooperation with the U.S. Environmental Protection Agency is developing analytical models to assess in-well groundwater flow conditions during the collection of groundwater samples from wells being pumped. This information can be used to inform groundwater samplers on when and how to collect samples that are most reflective of the targeted aquifer or hydrogeologiic unit.
Methods: In addition to the development of an easy to use analytical VBA code embedded into a spreadsheet file, field data has been collected to help asses the capability of the PAT to simulate in-well groundwater flow. The field data includes the collection of well tracer data to confirm observed travel times in wells that can be compared to simulated travel times in the PAT.
Below are data or web applications associated with this project.
Data associated with the evaluation of the PAT (Purge Analyzer Tool), Stringfellow Superfund site, Jurupa Valley, California, 2017
The concepts behind the PAT analytical program are discussed in the papers.
These papers include a discussion on the rationale for determination of in-well groundwater flow and time of travel, and on the limitations inherent in the program, which is important to ensure proper use.
Evaluation and application of the Purge Analyzer Tool (PAT) to determine in-well flow and purge criteria for sampling monitoring wells at the Stringfellow Superfund site in Jurupa Valley, California, in 2017
Borehole‐scale testing of matrix diffusion for contaminated‐rock aquifers
Instructions for running the analytical code PAT (Purge Analyzer Tool) for computation of in-well time of travel of groundwater under pumping conditions
In-well time-of-travel approach to evaluate optimal purge duration during low-flow sampling of monitoring wells
Hydraulically controlled discrete sampling from open boreholes
Below are software products associated with this project.
Software for the analytical code PAT (Purge Analyzer Tool) for computation of in-well time of travel of groundwater under pumping conditions
Purge Analyzer Tool - For computation of in-well time of travel of groundwater under pumping conditions.
Below are partners associated with this project.