CEMS Hybrid Luncheon – Novel Applications of the Hydraulic Profiling and Electrical Conductivity Tool for Site Investigation and Remediation – October 11

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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.

In Person Location:  Davis Graham and Stubbs, LLP will be hosting CEMS on October 11, 2022.  DGS is located at 1550 17th Street, Suite 500, Denver, CO 80202.  Parking validation is not available.  Virtual Registration: Please use this Registration Link.  After registering, you will receive a confirmation email containing detailed information about joining the webinar.  If you lose your registration or confirmation, or have questions, please do not hesitate to contact CEMS via email admin@coems.org.

In Person Registration: Members may either bring their own lunch and attend the meeting for no charge, or they may request that CEMS order a box lunch for them. The cost of the box lunch for members is $18.00; for non-members, $21.00.  PLEASE give your name, company name and phone number via email to admin@coems.org. PLEASE INDICATE IF YOU ARE RESERVING A BOX LUNCH OR BRINGING YOUR OWN. Reservations must be received BEFORE Friday, October 7, 2022 at 5:00PM. Payment will be accepted at the door with prior reservation. Please cancel your reservation by Friday, October 7, 2022 if you are unable to attend. It is the policy of the Society to bill for meals reserved but unclaimed. You may also pay with credit card via PAYPAL here:

Box Lunch

Sponsorship: CEMS accepts sponsorships to defer expenses associated with its webinar series. Information about sponsorship can be found here: Sponsorship Program

Notice: CEMS would like to thank Davis Graham & Stubbs, LLP for the use of meeting space and would like to emphasize that the use of Davis Graham & Stubbs, LLP space does not constitute endorsement of CEMS, sponsors of CEMS functions, or the content of CEMS workshops or meetings.


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