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The 7 Biggest Myths of Direct Sensing (Part II)

Posted by admin on Oct 3, 2012 1:07:12 PM

We hope you enjoyed our last blog post, The 7 Myths of Direct Sensing (Part I) outlining the three basic assumptions or principles we have in mind when deploying high resolution direct sensing tools, defining high resolution and direct sensing tools, and disclosing the first three myths related to site characterization projects.

Below are four additional myths related to detection levels, remediation programs, cost of direct sensing, and the need for real time data with the corresponding truths.

Myth 4: The detection levels of direct sensing tools like the Membrane Interface Probe (MIP) are not low enough

If you’re going off the basis that the contaminant levels at your site are too low for direct sensing tools, you’re probably should ask yourself do I really only have 10 ppb and if so, why do I still have 10 ppb? Direct sensing tools for contaminant profiling are first and foremost source area characterization tools.

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Tags: Direct Sensing, High Resolution Site Characterization (HRSC), Hydraulic Profiling Tool (HPT), Membrane Interface Probe-Hydraulic Profiling Tool, Membrane Interface Probe (MIP), News, Site Characterization

Five Steps to Developing Weighted Lines of Evidence During Site Characterization

Posted by John Sohl on May 30, 2012 12:39:43 PM

One of the most critical points to remember when developing a site closure work plan is that it simply costs too much to assess, remediate, and make decisions on information that is incomplete, inaccurate, and too late. Traditional approaches to characterizing subsurface conditions by drilling, soil sampling, and monitoring wells screened over large intervals are too incomplete to accurately deal with site heteregoneity.

Therefore, a high resolution site characterization approach is a more attractive option as it enables projects to move forward with remediation focused activities such as corrective action, free product recovery efforts, and site closure.

Let’s face it, the heterogeneity geology of a site is going to impact the migration of subsurface contamination opposed to the age old myth that it always follows the direction of groundwater. Introduction of the Hydraulic Profiling Tool (HPT) for site investigation and remediation efforts supports contaminant mapping activities to provide a greater understanding of subsurface conditions. By measuring direct pressure response, HPT develops weighted lines of evidence indicating the tight (or loose) grains and low (or high) flow zones in order to determine the migration pathways, remediation injection regions, and placements for monitoring wells. With an integrated Soil Electrical Conductivity (EC) array this tool also defines zones of lower conductivity which allows for the movement of contaminants into the subsurface.

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Tags: Hydraulic Profiling Tool (HPT), LNAPL, Membrane Interface Probe (MIP), News, Site Characterization