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Use of magnetic susceptibility to map amendment distribution in the subsurface

Mark Harkness,
Magnetic susceptibility measurements obtained on soil core

It has been said that one of the challenges of in-situ remediation is that “it’s dark underground”. We inject various remedial amendments into the subsurface and often have limited means to assess where they go, despite the fact that amendment distribution can have a major impact on remedial performance. It is critical to document that amendments are going where we expect them to go.

OBG is tackling this challenge by applying a novel method to determine the distribution of one particular amendment. EHC® is a solid amendment that combines a plant-based carbon source with microscale zero valent iron (ZVI) to support both biological and abiotic degradation of chlorinated ethenes. OBG employs this amendment in less permeable soils (e.g., silts and clays) where injection of soluble electron donors is problematic. The EHC® can be injected using a number of techniques, including direct injection or hydraulic or pneumatic fracturing.

Learn more in the article:

Use of magnetic susceptibility to map amendment distribution in the subsurface [PDF]
Mark Harkness, Paul Freyer, and Luke Reusser, OBG

About Mark Harkness: Mark is a leader in remediation project design and management with extensive experience implementing a wide range of innovative, pragmatic, and cost-effective remedial technologies to address petroleum and chlorinated solvents in soil and groundwater. He is widely published in bioremediation and frequently presents his work at environmental conferences, including the upcoming Battelle Chlorinated Conference 2018. Mark can be contacted at Mark.Harkness@obg.com.

About Paul Freyer: Paul is a professional geologist experienced in remedial investigation, site characterization, and bioremediation. Over his 12 year career, Paul has assisted clients through remedial and design investigations and has recently been involved with the design and implementation of several bioremediation pilot tests on chlorinated solvent impacted sites. Paul can be contacted at Paul.Freyer@obg.com.

About Luke Reusser, PhD: Luke joined OBG following completion of his graduate work in geomorphology and geohydrology at the University of Vermont, focusing on quantifying human impacts on rates of landscape erosion. Luke has experience with various site characterization methods and has worked on bioremediation pilot tests that will support remedial design to address chlorinated solvent soil and groundwater impacts at a site in New York State. Luke can be contacted at Lucas.Reusser@obg.com.