Novel Applications of the Hydraulic Profiling and Electrical Conductivity Tool for Site Investigation and Remediation
John Fontana, CPG, CWD, Vista Geoscience
Tuesday, October 11, 2022, 11:45am-1pm
Hybrid format – In person and virtual
CEMS has received (1) general CLE credit for this presentation
The hydraulic profiling tool (HPT) and tandem electrical conductivity (EC) logs have long been used during subsurface investigations to assess the permeability and lithology of unconsolidated formations. When combined with contaminant logging tools like the Membrane Interface Probe (MIP), Optical Image Profiler (OIP) or Laser Induced Fluorescence (LIF) tools, HPT and EC data can help define lithologic controls on contaminant migration, and even confined situations. However, there are many other applications that have made use of HPT/EC logs that this presentation will demonstrate.
One of the simplest applications is the identification of ideal screen intervals for shallow alluvial production wells. At another site where extraction wells are active in coarse grained materials, the HPT pressure log displayed a deviation in pressure from the standard piezometric head profile, which identified the amount of draw-down from groundwater extraction by a pump and treat system.
EC logs adhere to Archie’s Law in certain conditions, and this data is used to estimate and log the groundwater specific electrical conductance (SEC). This is essentially a log of total dissolved solids (TDS), which reflects influences by natural or introduced ionic sources. Comparing the EC log with the HPT pressure log can identify where water quality is impacted with elevated concentrations of dissolved ions. And investigation is shown where ionic influences such as seeping brines and freshwater recharge is identified in the HPT/EC log profiles relative to normal background. In another investigation where ionic in-situ remediation reagents have been injected, such as permanganates and sodium lactate, the reagent pathways are tracked by their influence on the groundwater conductivity. EC logs have even been used to identify the injection of thin sand fractures into tight clay formation for permeability enhancements, which shows a low EC sand response in a high EC clay matrix.
John Fontana is a certified professional geologist and certified well driller with over 35 years of experience, and currently serves as CEO and owner of Vista GeoScience. His experience includes implementing high resolution site characterization, data modeling and interpretation, optimized in-situ remediation technologies, and gas migration investigations. John served on two ITRC teams, Optimizing In-Situ Remediation Performance & Injection Strategies, and Implementing the Use of Advanced Site Characterization Tools, and was nominated to the EPA’s Science Advisory Board on Hydraulic Fracturing. John earned a degree in Geology, Oceanography and Physics from Humboldt State University in California in 1981.
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